a2f5b7f42a
There should be no functional changes resulting from this patch. Bart: - remove needless "!!" Signed-off-by: Borislav Petkov <petkovbb@gmail.com> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
3890 lines
115 KiB
C
3890 lines
115 KiB
C
/*
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* IDE ATAPI streaming tape driver.
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*
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* Copyright (C) 1995-1999 Gadi Oxman <gadio@netvision.net.il>
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* Copyright (C) 2003-2005 Bartlomiej Zolnierkiewicz
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*
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* This driver was constructed as a student project in the software laboratory
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* of the faculty of electrical engineering in the Technion - Israel's
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* Institute Of Technology, with the guide of Avner Lottem and Dr. Ilana David.
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*
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* It is hereby placed under the terms of the GNU general public license.
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* (See linux/COPYING).
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*
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* For a historical changelog see
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* Documentation/ide/ChangeLog.ide-tape.1995-2002
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*/
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#define IDETAPE_VERSION "1.19"
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/timer.h>
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#include <linux/mm.h>
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#include <linux/interrupt.h>
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#include <linux/jiffies.h>
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#include <linux/major.h>
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#include <linux/errno.h>
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#include <linux/genhd.h>
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#include <linux/slab.h>
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#include <linux/pci.h>
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#include <linux/ide.h>
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#include <linux/smp_lock.h>
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#include <linux/completion.h>
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#include <linux/bitops.h>
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#include <linux/mutex.h>
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#include <scsi/scsi.h>
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#include <asm/byteorder.h>
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#include <asm/irq.h>
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#include <asm/uaccess.h>
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#include <asm/io.h>
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#include <asm/unaligned.h>
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#include <linux/mtio.h>
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enum {
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/* output errors only */
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DBG_ERR = (1 << 0),
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/* output all sense key/asc */
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DBG_SENSE = (1 << 1),
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/* info regarding all chrdev-related procedures */
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DBG_CHRDEV = (1 << 2),
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/* all remaining procedures */
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DBG_PROCS = (1 << 3),
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/* buffer alloc info (pc_stack & rq_stack) */
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DBG_PCRQ_STACK = (1 << 4),
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};
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/* define to see debug info */
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#define IDETAPE_DEBUG_LOG 0
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#if IDETAPE_DEBUG_LOG
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#define debug_log(lvl, fmt, args...) \
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{ \
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if (tape->debug_mask & lvl) \
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printk(KERN_INFO "ide-tape: " fmt, ## args); \
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}
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#else
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#define debug_log(lvl, fmt, args...) do {} while (0)
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#endif
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/**************************** Tunable parameters *****************************/
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/*
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* Pipelined mode parameters.
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*
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* We try to use the minimum number of stages which is enough to
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* keep the tape constantly streaming. To accomplish that, we implement
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* a feedback loop around the maximum number of stages:
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*
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* We start from MIN maximum stages (we will not even use MIN stages
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* if we don't need them), increment it by RATE*(MAX-MIN)
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* whenever we sense that the pipeline is empty, until we reach
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* the optimum value or until we reach MAX.
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*
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* Setting the following parameter to 0 is illegal: the pipelined mode
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* cannot be disabled (calculate_speeds() divides by tape->max_stages.)
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*/
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#define IDETAPE_MIN_PIPELINE_STAGES 1
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#define IDETAPE_MAX_PIPELINE_STAGES 400
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#define IDETAPE_INCREASE_STAGES_RATE 20
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/*
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* After each failed packet command we issue a request sense command
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* and retry the packet command IDETAPE_MAX_PC_RETRIES times.
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*
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* Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries.
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*/
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#define IDETAPE_MAX_PC_RETRIES 3
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/*
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* With each packet command, we allocate a buffer of
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* IDETAPE_PC_BUFFER_SIZE bytes. This is used for several packet
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* commands (Not for READ/WRITE commands).
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*/
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#define IDETAPE_PC_BUFFER_SIZE 256
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/*
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* In various places in the driver, we need to allocate storage
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* for packet commands and requests, which will remain valid while
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* we leave the driver to wait for an interrupt or a timeout event.
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*/
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#define IDETAPE_PC_STACK (10 + IDETAPE_MAX_PC_RETRIES)
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/*
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* Some drives (for example, Seagate STT3401A Travan) require a very long
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* timeout, because they don't return an interrupt or clear their busy bit
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* until after the command completes (even retension commands).
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*/
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#define IDETAPE_WAIT_CMD (900*HZ)
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/*
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* The following parameter is used to select the point in the internal
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* tape fifo in which we will start to refill the buffer. Decreasing
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* the following parameter will improve the system's latency and
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* interactive response, while using a high value might improve system
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* throughput.
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*/
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#define IDETAPE_FIFO_THRESHOLD 2
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/*
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* DSC polling parameters.
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*
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* Polling for DSC (a single bit in the status register) is a very
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* important function in ide-tape. There are two cases in which we
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* poll for DSC:
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*
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* 1. Before a read/write packet command, to ensure that we
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* can transfer data from/to the tape's data buffers, without
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* causing an actual media access. In case the tape is not
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* ready yet, we take out our request from the device
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* request queue, so that ide.c will service requests from
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* the other device on the same interface meanwhile.
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*
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* 2. After the successful initialization of a "media access
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* packet command", which is a command which can take a long
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* time to complete (it can be several seconds or even an hour).
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*
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* Again, we postpone our request in the middle to free the bus
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* for the other device. The polling frequency here should be
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* lower than the read/write frequency since those media access
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* commands are slow. We start from a "fast" frequency -
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* IDETAPE_DSC_MA_FAST (one second), and if we don't receive DSC
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* after IDETAPE_DSC_MA_THRESHOLD (5 minutes), we switch it to a
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* lower frequency - IDETAPE_DSC_MA_SLOW (1 minute).
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*
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* We also set a timeout for the timer, in case something goes wrong.
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* The timeout should be longer then the maximum execution time of a
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* tape operation.
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*/
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/*
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* DSC timings.
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*/
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#define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */
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#define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */
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#define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */
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#define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */
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#define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */
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#define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */
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#define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */
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/*************************** End of tunable parameters ***********************/
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/*
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* Read/Write error simulation
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*/
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#define SIMULATE_ERRORS 0
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/*
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* For general magnetic tape device compatibility.
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*/
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typedef enum {
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idetape_direction_none,
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idetape_direction_read,
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idetape_direction_write
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} idetape_chrdev_direction_t;
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struct idetape_bh {
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u32 b_size;
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atomic_t b_count;
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struct idetape_bh *b_reqnext;
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char *b_data;
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};
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/*
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* Our view of a packet command.
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*/
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typedef struct idetape_packet_command_s {
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u8 c[12]; /* Actual packet bytes */
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int retries; /* On each retry, we increment retries */
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int error; /* Error code */
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int request_transfer; /* Bytes to transfer */
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int actually_transferred; /* Bytes actually transferred */
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int buffer_size; /* Size of our data buffer */
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struct idetape_bh *bh;
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char *b_data;
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int b_count;
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u8 *buffer; /* Data buffer */
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u8 *current_position; /* Pointer into the above buffer */
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ide_startstop_t (*callback) (ide_drive_t *); /* Called when this packet command is completed */
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u8 pc_buffer[IDETAPE_PC_BUFFER_SIZE]; /* Temporary buffer */
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unsigned long flags; /* Status/Action bit flags: long for set_bit */
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} idetape_pc_t;
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/*
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* Packet command flag bits.
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*/
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/* Set when an error is considered normal - We won't retry */
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#define PC_ABORT 0
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/* 1 When polling for DSC on a media access command */
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#define PC_WAIT_FOR_DSC 1
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/* 1 when we prefer to use DMA if possible */
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#define PC_DMA_RECOMMENDED 2
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/* 1 while DMA in progress */
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#define PC_DMA_IN_PROGRESS 3
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/* 1 when encountered problem during DMA */
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#define PC_DMA_ERROR 4
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/* Data direction */
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#define PC_WRITING 5
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/*
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* A pipeline stage.
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*/
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typedef struct idetape_stage_s {
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struct request rq; /* The corresponding request */
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struct idetape_bh *bh; /* The data buffers */
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struct idetape_stage_s *next; /* Pointer to the next stage */
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} idetape_stage_t;
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/*
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* Most of our global data which we need to save even as we leave the
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* driver due to an interrupt or a timer event is stored in a variable
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* of type idetape_tape_t, defined below.
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*/
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typedef struct ide_tape_obj {
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ide_drive_t *drive;
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ide_driver_t *driver;
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struct gendisk *disk;
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struct kref kref;
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/*
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* Since a typical character device operation requires more
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* than one packet command, we provide here enough memory
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* for the maximum of interconnected packet commands.
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* The packet commands are stored in the circular array pc_stack.
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* pc_stack_index points to the last used entry, and warps around
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* to the start when we get to the last array entry.
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*
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* pc points to the current processed packet command.
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*
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* failed_pc points to the last failed packet command, or contains
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* NULL if we do not need to retry any packet command. This is
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* required since an additional packet command is needed before the
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* retry, to get detailed information on what went wrong.
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*/
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/* Current packet command */
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idetape_pc_t *pc;
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/* Last failed packet command */
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idetape_pc_t *failed_pc;
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/* Packet command stack */
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idetape_pc_t pc_stack[IDETAPE_PC_STACK];
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/* Next free packet command storage space */
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int pc_stack_index;
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struct request rq_stack[IDETAPE_PC_STACK];
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/* We implement a circular array */
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int rq_stack_index;
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/*
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* DSC polling variables.
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*
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* While polling for DSC we use postponed_rq to postpone the
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* current request so that ide.c will be able to service
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* pending requests on the other device. Note that at most
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* we will have only one DSC (usually data transfer) request
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* in the device request queue. Additional requests can be
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* queued in our internal pipeline, but they will be visible
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* to ide.c only one at a time.
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*/
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struct request *postponed_rq;
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/* The time in which we started polling for DSC */
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unsigned long dsc_polling_start;
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/* Timer used to poll for dsc */
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struct timer_list dsc_timer;
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/* Read/Write dsc polling frequency */
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unsigned long best_dsc_rw_frequency;
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/* The current polling frequency */
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unsigned long dsc_polling_frequency;
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/* Maximum waiting time */
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unsigned long dsc_timeout;
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/*
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* Read position information
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*/
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u8 partition;
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/* Current block */
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unsigned int first_frame_position;
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unsigned int last_frame_position;
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unsigned int blocks_in_buffer;
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/*
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* Last error information
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*/
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u8 sense_key, asc, ascq;
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/*
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* Character device operation
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*/
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unsigned int minor;
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/* device name */
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char name[4];
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/* Current character device data transfer direction */
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idetape_chrdev_direction_t chrdev_direction;
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/*
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* Device information
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*/
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/* Usually 512 or 1024 bytes */
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unsigned short tape_block_size;
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int user_bs_factor;
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/* Copy of the tape's Capabilities and Mechanical Page */
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u8 caps[20];
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/*
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* Active data transfer request parameters.
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*
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* At most, there is only one ide-tape originated data transfer
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* request in the device request queue. This allows ide.c to
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* easily service requests from the other device when we
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* postpone our active request. In the pipelined operation
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* mode, we use our internal pipeline structure to hold
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* more data requests.
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*
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* The data buffer size is chosen based on the tape's
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* recommendation.
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*/
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/* Pointer to the request which is waiting in the device request queue */
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struct request *active_data_request;
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/* Data buffer size (chosen based on the tape's recommendation */
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int stage_size;
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idetape_stage_t *merge_stage;
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int merge_stage_size;
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struct idetape_bh *bh;
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char *b_data;
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int b_count;
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/*
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* Pipeline parameters.
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*
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* To accomplish non-pipelined mode, we simply set the following
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* variables to zero (or NULL, where appropriate).
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*/
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/* Number of currently used stages */
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int nr_stages;
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/* Number of pending stages */
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int nr_pending_stages;
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/* We will not allocate more than this number of stages */
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int max_stages, min_pipeline, max_pipeline;
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/* The first stage which will be removed from the pipeline */
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idetape_stage_t *first_stage;
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/* The currently active stage */
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idetape_stage_t *active_stage;
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/* Will be serviced after the currently active request */
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idetape_stage_t *next_stage;
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/* New requests will be added to the pipeline here */
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idetape_stage_t *last_stage;
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/* Optional free stage which we can use */
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idetape_stage_t *cache_stage;
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int pages_per_stage;
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/* Wasted space in each stage */
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int excess_bh_size;
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/* Status/Action flags: long for set_bit */
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unsigned long flags;
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/* protects the ide-tape queue */
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spinlock_t spinlock;
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/*
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* Measures average tape speed
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*/
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unsigned long avg_time;
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int avg_size;
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int avg_speed;
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char vendor_id[10];
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char product_id[18];
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char firmware_revision[6];
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int firmware_revision_num;
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/* the door is currently locked */
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int door_locked;
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/* the tape hardware is write protected */
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char drv_write_prot;
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/* the tape is write protected (hardware or opened as read-only) */
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char write_prot;
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/*
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* Limit the number of times a request can
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* be postponed, to avoid an infinite postpone
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* deadlock.
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*/
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/* request postpone count limit */
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int postpone_cnt;
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/*
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* Measures number of frames:
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*
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* 1. written/read to/from the driver pipeline (pipeline_head).
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* 2. written/read to/from the tape buffers (idetape_bh).
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* 3. written/read by the tape to/from the media (tape_head).
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*/
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int pipeline_head;
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int buffer_head;
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int tape_head;
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int last_tape_head;
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/*
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* Speed control at the tape buffers input/output
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*/
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unsigned long insert_time;
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int insert_size;
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int insert_speed;
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int max_insert_speed;
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int measure_insert_time;
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/*
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* Measure tape still time, in milliseconds
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*/
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unsigned long tape_still_time_begin;
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int tape_still_time;
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/*
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* Speed regulation negative feedback loop
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*/
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int speed_control;
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int pipeline_head_speed;
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int controlled_pipeline_head_speed;
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int uncontrolled_pipeline_head_speed;
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int controlled_last_pipeline_head;
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int uncontrolled_last_pipeline_head;
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unsigned long uncontrolled_pipeline_head_time;
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unsigned long controlled_pipeline_head_time;
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int controlled_previous_pipeline_head;
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int uncontrolled_previous_pipeline_head;
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unsigned long controlled_previous_head_time;
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unsigned long uncontrolled_previous_head_time;
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int restart_speed_control_req;
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u32 debug_mask;
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} idetape_tape_t;
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static DEFINE_MUTEX(idetape_ref_mutex);
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static struct class *idetape_sysfs_class;
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#define to_ide_tape(obj) container_of(obj, struct ide_tape_obj, kref)
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#define ide_tape_g(disk) \
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container_of((disk)->private_data, struct ide_tape_obj, driver)
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static struct ide_tape_obj *ide_tape_get(struct gendisk *disk)
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{
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struct ide_tape_obj *tape = NULL;
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mutex_lock(&idetape_ref_mutex);
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tape = ide_tape_g(disk);
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if (tape)
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kref_get(&tape->kref);
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mutex_unlock(&idetape_ref_mutex);
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return tape;
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}
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static void ide_tape_release(struct kref *);
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static void ide_tape_put(struct ide_tape_obj *tape)
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{
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mutex_lock(&idetape_ref_mutex);
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kref_put(&tape->kref, ide_tape_release);
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mutex_unlock(&idetape_ref_mutex);
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}
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/*
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* Tape door status
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*/
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#define DOOR_UNLOCKED 0
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#define DOOR_LOCKED 1
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#define DOOR_EXPLICITLY_LOCKED 2
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/*
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* Tape flag bits values.
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*/
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#define IDETAPE_IGNORE_DSC 0
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#define IDETAPE_ADDRESS_VALID 1 /* 0 When the tape position is unknown */
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#define IDETAPE_BUSY 2 /* Device already opened */
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#define IDETAPE_PIPELINE_ERROR 3 /* Error detected in a pipeline stage */
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#define IDETAPE_DETECT_BS 4 /* Attempt to auto-detect the current user block size */
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#define IDETAPE_FILEMARK 5 /* Currently on a filemark */
|
|
#define IDETAPE_DRQ_INTERRUPT 6 /* DRQ interrupt device */
|
|
#define IDETAPE_READ_ERROR 7
|
|
#define IDETAPE_PIPELINE_ACTIVE 8 /* pipeline active */
|
|
/* 0 = no tape is loaded, so we don't rewind after ejecting */
|
|
#define IDETAPE_MEDIUM_PRESENT 9
|
|
|
|
/*
|
|
* Some defines for the READ BUFFER command
|
|
*/
|
|
#define IDETAPE_RETRIEVE_FAULTY_BLOCK 6
|
|
|
|
/*
|
|
* Some defines for the SPACE command
|
|
*/
|
|
#define IDETAPE_SPACE_OVER_FILEMARK 1
|
|
#define IDETAPE_SPACE_TO_EOD 3
|
|
|
|
/*
|
|
* Some defines for the LOAD UNLOAD command
|
|
*/
|
|
#define IDETAPE_LU_LOAD_MASK 1
|
|
#define IDETAPE_LU_RETENSION_MASK 2
|
|
#define IDETAPE_LU_EOT_MASK 4
|
|
|
|
/*
|
|
* Special requests for our block device strategy routine.
|
|
*
|
|
* In order to service a character device command, we add special
|
|
* requests to the tail of our block device request queue and wait
|
|
* for their completion.
|
|
*/
|
|
|
|
enum {
|
|
REQ_IDETAPE_PC1 = (1 << 0), /* packet command (first stage) */
|
|
REQ_IDETAPE_PC2 = (1 << 1), /* packet command (second stage) */
|
|
REQ_IDETAPE_READ = (1 << 2),
|
|
REQ_IDETAPE_WRITE = (1 << 3),
|
|
REQ_IDETAPE_READ_BUFFER = (1 << 4),
|
|
};
|
|
|
|
/*
|
|
* Error codes which are returned in rq->errors to the higher part
|
|
* of the driver.
|
|
*/
|
|
#define IDETAPE_ERROR_GENERAL 101
|
|
#define IDETAPE_ERROR_FILEMARK 102
|
|
#define IDETAPE_ERROR_EOD 103
|
|
|
|
/*
|
|
* The following is used to format the general configuration word of
|
|
* the ATAPI IDENTIFY DEVICE command.
|
|
*/
|
|
struct idetape_id_gcw {
|
|
unsigned packet_size :2; /* Packet Size */
|
|
unsigned reserved234 :3; /* Reserved */
|
|
unsigned drq_type :2; /* Command packet DRQ type */
|
|
unsigned removable :1; /* Removable media */
|
|
unsigned device_type :5; /* Device type */
|
|
unsigned reserved13 :1; /* Reserved */
|
|
unsigned protocol :2; /* Protocol type */
|
|
};
|
|
|
|
/* Structures related to the SELECT SENSE / MODE SENSE packet commands. */
|
|
#define IDETAPE_BLOCK_DESCRIPTOR 0
|
|
#define IDETAPE_CAPABILITIES_PAGE 0x2a
|
|
|
|
/*
|
|
* The variables below are used for the character device interface.
|
|
* Additional state variables are defined in our ide_drive_t structure.
|
|
*/
|
|
static struct ide_tape_obj * idetape_devs[MAX_HWIFS * MAX_DRIVES];
|
|
|
|
#define ide_tape_f(file) ((file)->private_data)
|
|
|
|
static struct ide_tape_obj *ide_tape_chrdev_get(unsigned int i)
|
|
{
|
|
struct ide_tape_obj *tape = NULL;
|
|
|
|
mutex_lock(&idetape_ref_mutex);
|
|
tape = idetape_devs[i];
|
|
if (tape)
|
|
kref_get(&tape->kref);
|
|
mutex_unlock(&idetape_ref_mutex);
|
|
return tape;
|
|
}
|
|
|
|
/*
|
|
* Function declarations
|
|
*
|
|
*/
|
|
static int idetape_chrdev_release (struct inode *inode, struct file *filp);
|
|
static void idetape_write_release (ide_drive_t *drive, unsigned int minor);
|
|
|
|
/*
|
|
* Too bad. The drive wants to send us data which we are not ready to accept.
|
|
* Just throw it away.
|
|
*/
|
|
static void idetape_discard_data (ide_drive_t *drive, unsigned int bcount)
|
|
{
|
|
while (bcount--)
|
|
(void) HWIF(drive)->INB(IDE_DATA_REG);
|
|
}
|
|
|
|
static void idetape_input_buffers (ide_drive_t *drive, idetape_pc_t *pc, unsigned int bcount)
|
|
{
|
|
struct idetape_bh *bh = pc->bh;
|
|
int count;
|
|
|
|
while (bcount) {
|
|
if (bh == NULL) {
|
|
printk(KERN_ERR "ide-tape: bh == NULL in "
|
|
"idetape_input_buffers\n");
|
|
idetape_discard_data(drive, bcount);
|
|
return;
|
|
}
|
|
count = min((unsigned int)(bh->b_size - atomic_read(&bh->b_count)), bcount);
|
|
HWIF(drive)->atapi_input_bytes(drive, bh->b_data + atomic_read(&bh->b_count), count);
|
|
bcount -= count;
|
|
atomic_add(count, &bh->b_count);
|
|
if (atomic_read(&bh->b_count) == bh->b_size) {
|
|
bh = bh->b_reqnext;
|
|
if (bh)
|
|
atomic_set(&bh->b_count, 0);
|
|
}
|
|
}
|
|
pc->bh = bh;
|
|
}
|
|
|
|
static void idetape_output_buffers (ide_drive_t *drive, idetape_pc_t *pc, unsigned int bcount)
|
|
{
|
|
struct idetape_bh *bh = pc->bh;
|
|
int count;
|
|
|
|
while (bcount) {
|
|
if (bh == NULL) {
|
|
printk(KERN_ERR "ide-tape: bh == NULL in "
|
|
"idetape_output_buffers\n");
|
|
return;
|
|
}
|
|
count = min((unsigned int)pc->b_count, (unsigned int)bcount);
|
|
HWIF(drive)->atapi_output_bytes(drive, pc->b_data, count);
|
|
bcount -= count;
|
|
pc->b_data += count;
|
|
pc->b_count -= count;
|
|
if (!pc->b_count) {
|
|
pc->bh = bh = bh->b_reqnext;
|
|
if (bh) {
|
|
pc->b_data = bh->b_data;
|
|
pc->b_count = atomic_read(&bh->b_count);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static void idetape_update_buffers (idetape_pc_t *pc)
|
|
{
|
|
struct idetape_bh *bh = pc->bh;
|
|
int count;
|
|
unsigned int bcount = pc->actually_transferred;
|
|
|
|
if (test_bit(PC_WRITING, &pc->flags))
|
|
return;
|
|
while (bcount) {
|
|
if (bh == NULL) {
|
|
printk(KERN_ERR "ide-tape: bh == NULL in "
|
|
"idetape_update_buffers\n");
|
|
return;
|
|
}
|
|
count = min((unsigned int)bh->b_size, (unsigned int)bcount);
|
|
atomic_set(&bh->b_count, count);
|
|
if (atomic_read(&bh->b_count) == bh->b_size)
|
|
bh = bh->b_reqnext;
|
|
bcount -= count;
|
|
}
|
|
pc->bh = bh;
|
|
}
|
|
|
|
/*
|
|
* idetape_next_pc_storage returns a pointer to a place in which we can
|
|
* safely store a packet command, even though we intend to leave the
|
|
* driver. A storage space for a maximum of IDETAPE_PC_STACK packet
|
|
* commands is allocated at initialization time.
|
|
*/
|
|
static idetape_pc_t *idetape_next_pc_storage (ide_drive_t *drive)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
|
|
debug_log(DBG_PCRQ_STACK, "pc_stack_index=%d\n", tape->pc_stack_index);
|
|
|
|
if (tape->pc_stack_index == IDETAPE_PC_STACK)
|
|
tape->pc_stack_index=0;
|
|
return (&tape->pc_stack[tape->pc_stack_index++]);
|
|
}
|
|
|
|
/*
|
|
* idetape_next_rq_storage is used along with idetape_next_pc_storage.
|
|
* Since we queue packet commands in the request queue, we need to
|
|
* allocate a request, along with the allocation of a packet command.
|
|
*/
|
|
|
|
/**************************************************************
|
|
* *
|
|
* This should get fixed to use kmalloc(.., GFP_ATOMIC) *
|
|
* followed later on by kfree(). -ml *
|
|
* *
|
|
**************************************************************/
|
|
|
|
static struct request *idetape_next_rq_storage (ide_drive_t *drive)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
|
|
debug_log(DBG_PCRQ_STACK, "rq_stack_index=%d\n", tape->rq_stack_index);
|
|
|
|
if (tape->rq_stack_index == IDETAPE_PC_STACK)
|
|
tape->rq_stack_index=0;
|
|
return (&tape->rq_stack[tape->rq_stack_index++]);
|
|
}
|
|
|
|
/*
|
|
* idetape_init_pc initializes a packet command.
|
|
*/
|
|
static void idetape_init_pc (idetape_pc_t *pc)
|
|
{
|
|
memset(pc->c, 0, 12);
|
|
pc->retries = 0;
|
|
pc->flags = 0;
|
|
pc->request_transfer = 0;
|
|
pc->buffer = pc->pc_buffer;
|
|
pc->buffer_size = IDETAPE_PC_BUFFER_SIZE;
|
|
pc->bh = NULL;
|
|
pc->b_data = NULL;
|
|
}
|
|
|
|
/*
|
|
* called on each failed packet command retry to analyze the request sense. We
|
|
* currently do not utilize this information.
|
|
*/
|
|
static void idetape_analyze_error(ide_drive_t *drive, u8 *sense)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
idetape_pc_t *pc = tape->failed_pc;
|
|
|
|
tape->sense_key = sense[2] & 0xF;
|
|
tape->asc = sense[12];
|
|
tape->ascq = sense[13];
|
|
|
|
debug_log(DBG_ERR, "pc = %x, sense key = %x, asc = %x, ascq = %x\n",
|
|
pc->c[0], tape->sense_key, tape->asc, tape->ascq);
|
|
|
|
/* Correct pc->actually_transferred by asking the tape. */
|
|
if (test_bit(PC_DMA_ERROR, &pc->flags)) {
|
|
pc->actually_transferred = pc->request_transfer -
|
|
tape->tape_block_size *
|
|
be32_to_cpu(get_unaligned((u32 *)&sense[3]));
|
|
idetape_update_buffers(pc);
|
|
}
|
|
|
|
/*
|
|
* If error was the result of a zero-length read or write command,
|
|
* with sense key=5, asc=0x22, ascq=0, let it slide. Some drives
|
|
* (i.e. Seagate STT3401A Travan) don't support 0-length read/writes.
|
|
*/
|
|
if ((pc->c[0] == READ_6 || pc->c[0] == WRITE_6)
|
|
/* length == 0 */
|
|
&& pc->c[4] == 0 && pc->c[3] == 0 && pc->c[2] == 0) {
|
|
if (tape->sense_key == 5) {
|
|
/* don't report an error, everything's ok */
|
|
pc->error = 0;
|
|
/* don't retry read/write */
|
|
set_bit(PC_ABORT, &pc->flags);
|
|
}
|
|
}
|
|
if (pc->c[0] == READ_6 && (sense[2] & 0x80)) {
|
|
pc->error = IDETAPE_ERROR_FILEMARK;
|
|
set_bit(PC_ABORT, &pc->flags);
|
|
}
|
|
if (pc->c[0] == WRITE_6) {
|
|
if ((sense[2] & 0x40) || (tape->sense_key == 0xd
|
|
&& tape->asc == 0x0 && tape->ascq == 0x2)) {
|
|
pc->error = IDETAPE_ERROR_EOD;
|
|
set_bit(PC_ABORT, &pc->flags);
|
|
}
|
|
}
|
|
if (pc->c[0] == READ_6 || pc->c[0] == WRITE_6) {
|
|
if (tape->sense_key == 8) {
|
|
pc->error = IDETAPE_ERROR_EOD;
|
|
set_bit(PC_ABORT, &pc->flags);
|
|
}
|
|
if (!test_bit(PC_ABORT, &pc->flags) &&
|
|
pc->actually_transferred)
|
|
pc->retries = IDETAPE_MAX_PC_RETRIES + 1;
|
|
}
|
|
}
|
|
|
|
static void idetape_activate_next_stage(ide_drive_t *drive)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
idetape_stage_t *stage = tape->next_stage;
|
|
struct request *rq = &stage->rq;
|
|
|
|
debug_log(DBG_PROCS, "Enter %s\n", __func__);
|
|
|
|
if (stage == NULL) {
|
|
printk(KERN_ERR "ide-tape: bug: Trying to activate a non"
|
|
" existing stage\n");
|
|
return;
|
|
}
|
|
|
|
rq->rq_disk = tape->disk;
|
|
rq->buffer = NULL;
|
|
rq->special = (void *)stage->bh;
|
|
tape->active_data_request = rq;
|
|
tape->active_stage = stage;
|
|
tape->next_stage = stage->next;
|
|
}
|
|
|
|
/*
|
|
* idetape_increase_max_pipeline_stages is a part of the feedback
|
|
* loop which tries to find the optimum number of stages. In the
|
|
* feedback loop, we are starting from a minimum maximum number of
|
|
* stages, and if we sense that the pipeline is empty, we try to
|
|
* increase it, until we reach the user compile time memory limit.
|
|
*/
|
|
static void idetape_increase_max_pipeline_stages (ide_drive_t *drive)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
int increase = (tape->max_pipeline - tape->min_pipeline) / 10;
|
|
|
|
debug_log(DBG_PROCS, "Enter %s\n", __func__);
|
|
|
|
tape->max_stages += max(increase, 1);
|
|
tape->max_stages = max(tape->max_stages, tape->min_pipeline);
|
|
tape->max_stages = min(tape->max_stages, tape->max_pipeline);
|
|
}
|
|
|
|
/*
|
|
* idetape_kfree_stage calls kfree to completely free a stage, along with
|
|
* its related buffers.
|
|
*/
|
|
static void __idetape_kfree_stage (idetape_stage_t *stage)
|
|
{
|
|
struct idetape_bh *prev_bh, *bh = stage->bh;
|
|
int size;
|
|
|
|
while (bh != NULL) {
|
|
if (bh->b_data != NULL) {
|
|
size = (int) bh->b_size;
|
|
while (size > 0) {
|
|
free_page((unsigned long) bh->b_data);
|
|
size -= PAGE_SIZE;
|
|
bh->b_data += PAGE_SIZE;
|
|
}
|
|
}
|
|
prev_bh = bh;
|
|
bh = bh->b_reqnext;
|
|
kfree(prev_bh);
|
|
}
|
|
kfree(stage);
|
|
}
|
|
|
|
static void idetape_kfree_stage (idetape_tape_t *tape, idetape_stage_t *stage)
|
|
{
|
|
__idetape_kfree_stage(stage);
|
|
}
|
|
|
|
/*
|
|
* idetape_remove_stage_head removes tape->first_stage from the pipeline.
|
|
* The caller should avoid race conditions.
|
|
*/
|
|
static void idetape_remove_stage_head (ide_drive_t *drive)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
idetape_stage_t *stage;
|
|
|
|
debug_log(DBG_PROCS, "Enter %s\n", __func__);
|
|
|
|
if (tape->first_stage == NULL) {
|
|
printk(KERN_ERR "ide-tape: bug: tape->first_stage is NULL\n");
|
|
return;
|
|
}
|
|
if (tape->active_stage == tape->first_stage) {
|
|
printk(KERN_ERR "ide-tape: bug: Trying to free our active "
|
|
"pipeline stage\n");
|
|
return;
|
|
}
|
|
stage = tape->first_stage;
|
|
tape->first_stage = stage->next;
|
|
idetape_kfree_stage(tape, stage);
|
|
tape->nr_stages--;
|
|
if (tape->first_stage == NULL) {
|
|
tape->last_stage = NULL;
|
|
if (tape->next_stage != NULL)
|
|
printk(KERN_ERR "ide-tape: bug: tape->next_stage != NULL\n");
|
|
if (tape->nr_stages)
|
|
printk(KERN_ERR "ide-tape: bug: nr_stages should be 0 now\n");
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This will free all the pipeline stages starting from new_last_stage->next
|
|
* to the end of the list, and point tape->last_stage to new_last_stage.
|
|
*/
|
|
static void idetape_abort_pipeline(ide_drive_t *drive,
|
|
idetape_stage_t *new_last_stage)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
idetape_stage_t *stage = new_last_stage->next;
|
|
idetape_stage_t *nstage;
|
|
|
|
debug_log(DBG_PROCS, "%s: Enter %s\n", tape->name, __func__);
|
|
|
|
while (stage) {
|
|
nstage = stage->next;
|
|
idetape_kfree_stage(tape, stage);
|
|
--tape->nr_stages;
|
|
--tape->nr_pending_stages;
|
|
stage = nstage;
|
|
}
|
|
if (new_last_stage)
|
|
new_last_stage->next = NULL;
|
|
tape->last_stage = new_last_stage;
|
|
tape->next_stage = NULL;
|
|
}
|
|
|
|
/*
|
|
* idetape_end_request is used to finish servicing a request, and to
|
|
* insert a pending pipeline request into the main device queue.
|
|
*/
|
|
static int idetape_end_request(ide_drive_t *drive, int uptodate, int nr_sects)
|
|
{
|
|
struct request *rq = HWGROUP(drive)->rq;
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
unsigned long flags;
|
|
int error;
|
|
int remove_stage = 0;
|
|
idetape_stage_t *active_stage;
|
|
|
|
debug_log(DBG_PROCS, "Enter %s\n", __func__);
|
|
|
|
switch (uptodate) {
|
|
case 0: error = IDETAPE_ERROR_GENERAL; break;
|
|
case 1: error = 0; break;
|
|
default: error = uptodate;
|
|
}
|
|
rq->errors = error;
|
|
if (error)
|
|
tape->failed_pc = NULL;
|
|
|
|
if (!blk_special_request(rq)) {
|
|
ide_end_request(drive, uptodate, nr_sects);
|
|
return 0;
|
|
}
|
|
|
|
spin_lock_irqsave(&tape->spinlock, flags);
|
|
|
|
/* The request was a pipelined data transfer request */
|
|
if (tape->active_data_request == rq) {
|
|
active_stage = tape->active_stage;
|
|
tape->active_stage = NULL;
|
|
tape->active_data_request = NULL;
|
|
tape->nr_pending_stages--;
|
|
if (rq->cmd[0] & REQ_IDETAPE_WRITE) {
|
|
remove_stage = 1;
|
|
if (error) {
|
|
set_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
|
|
if (error == IDETAPE_ERROR_EOD)
|
|
idetape_abort_pipeline(drive, active_stage);
|
|
}
|
|
} else if (rq->cmd[0] & REQ_IDETAPE_READ) {
|
|
if (error == IDETAPE_ERROR_EOD) {
|
|
set_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
|
|
idetape_abort_pipeline(drive, active_stage);
|
|
}
|
|
}
|
|
if (tape->next_stage != NULL) {
|
|
idetape_activate_next_stage(drive);
|
|
|
|
/*
|
|
* Insert the next request into the request queue.
|
|
*/
|
|
(void) ide_do_drive_cmd(drive, tape->active_data_request, ide_end);
|
|
} else if (!error) {
|
|
idetape_increase_max_pipeline_stages(drive);
|
|
}
|
|
}
|
|
ide_end_drive_cmd(drive, 0, 0);
|
|
// blkdev_dequeue_request(rq);
|
|
// drive->rq = NULL;
|
|
// end_that_request_last(rq);
|
|
|
|
if (remove_stage)
|
|
idetape_remove_stage_head(drive);
|
|
if (tape->active_data_request == NULL)
|
|
clear_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags);
|
|
spin_unlock_irqrestore(&tape->spinlock, flags);
|
|
return 0;
|
|
}
|
|
|
|
static ide_startstop_t idetape_request_sense_callback (ide_drive_t *drive)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
|
|
debug_log(DBG_PROCS, "Enter %s\n", __func__);
|
|
|
|
if (!tape->pc->error) {
|
|
idetape_analyze_error(drive, tape->pc->buffer);
|
|
idetape_end_request(drive, 1, 0);
|
|
} else {
|
|
printk(KERN_ERR "ide-tape: Error in REQUEST SENSE itself - Aborting request!\n");
|
|
idetape_end_request(drive, 0, 0);
|
|
}
|
|
return ide_stopped;
|
|
}
|
|
|
|
static void idetape_create_request_sense_cmd (idetape_pc_t *pc)
|
|
{
|
|
idetape_init_pc(pc);
|
|
pc->c[0] = REQUEST_SENSE;
|
|
pc->c[4] = 20;
|
|
pc->request_transfer = 20;
|
|
pc->callback = &idetape_request_sense_callback;
|
|
}
|
|
|
|
static void idetape_init_rq(struct request *rq, u8 cmd)
|
|
{
|
|
memset(rq, 0, sizeof(*rq));
|
|
rq->cmd_type = REQ_TYPE_SPECIAL;
|
|
rq->cmd[0] = cmd;
|
|
}
|
|
|
|
/*
|
|
* idetape_queue_pc_head generates a new packet command request in front
|
|
* of the request queue, before the current request, so that it will be
|
|
* processed immediately, on the next pass through the driver.
|
|
*
|
|
* idetape_queue_pc_head is called from the request handling part of
|
|
* the driver (the "bottom" part). Safe storage for the request should
|
|
* be allocated with idetape_next_pc_storage and idetape_next_rq_storage
|
|
* before calling idetape_queue_pc_head.
|
|
*
|
|
* Memory for those requests is pre-allocated at initialization time, and
|
|
* is limited to IDETAPE_PC_STACK requests. We assume that we have enough
|
|
* space for the maximum possible number of inter-dependent packet commands.
|
|
*
|
|
* The higher level of the driver - The ioctl handler and the character
|
|
* device handling functions should queue request to the lower level part
|
|
* and wait for their completion using idetape_queue_pc_tail or
|
|
* idetape_queue_rw_tail.
|
|
*/
|
|
static void idetape_queue_pc_head (ide_drive_t *drive, idetape_pc_t *pc,struct request *rq)
|
|
{
|
|
struct ide_tape_obj *tape = drive->driver_data;
|
|
|
|
idetape_init_rq(rq, REQ_IDETAPE_PC1);
|
|
rq->buffer = (char *) pc;
|
|
rq->rq_disk = tape->disk;
|
|
(void) ide_do_drive_cmd(drive, rq, ide_preempt);
|
|
}
|
|
|
|
/*
|
|
* idetape_retry_pc is called when an error was detected during the
|
|
* last packet command. We queue a request sense packet command in
|
|
* the head of the request list.
|
|
*/
|
|
static ide_startstop_t idetape_retry_pc (ide_drive_t *drive)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
idetape_pc_t *pc;
|
|
struct request *rq;
|
|
|
|
(void)ide_read_error(drive);
|
|
pc = idetape_next_pc_storage(drive);
|
|
rq = idetape_next_rq_storage(drive);
|
|
idetape_create_request_sense_cmd(pc);
|
|
set_bit(IDETAPE_IGNORE_DSC, &tape->flags);
|
|
idetape_queue_pc_head(drive, pc, rq);
|
|
return ide_stopped;
|
|
}
|
|
|
|
/*
|
|
* idetape_postpone_request postpones the current request so that
|
|
* ide.c will be able to service requests from another device on
|
|
* the same hwgroup while we are polling for DSC.
|
|
*/
|
|
static void idetape_postpone_request (ide_drive_t *drive)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
|
|
debug_log(DBG_PROCS, "Enter %s\n", __func__);
|
|
|
|
tape->postponed_rq = HWGROUP(drive)->rq;
|
|
ide_stall_queue(drive, tape->dsc_polling_frequency);
|
|
}
|
|
|
|
/*
|
|
* idetape_pc_intr is the usual interrupt handler which will be called
|
|
* during a packet command. We will transfer some of the data (as
|
|
* requested by the drive) and will re-point interrupt handler to us.
|
|
* When data transfer is finished, we will act according to the
|
|
* algorithm described before idetape_issue_packet_command.
|
|
*
|
|
*/
|
|
static ide_startstop_t idetape_pc_intr (ide_drive_t *drive)
|
|
{
|
|
ide_hwif_t *hwif = drive->hwif;
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
idetape_pc_t *pc = tape->pc;
|
|
unsigned int temp;
|
|
#if SIMULATE_ERRORS
|
|
static int error_sim_count = 0;
|
|
#endif
|
|
u16 bcount;
|
|
u8 stat, ireason;
|
|
|
|
debug_log(DBG_PROCS, "Enter %s - interrupt handler\n", __func__);
|
|
|
|
/* Clear the interrupt */
|
|
stat = ide_read_status(drive);
|
|
|
|
if (test_bit(PC_DMA_IN_PROGRESS, &pc->flags)) {
|
|
if (hwif->ide_dma_end(drive) || (stat & ERR_STAT)) {
|
|
/*
|
|
* A DMA error is sometimes expected. For example,
|
|
* if the tape is crossing a filemark during a
|
|
* READ command, it will issue an irq and position
|
|
* itself before the filemark, so that only a partial
|
|
* data transfer will occur (which causes the DMA
|
|
* error). In that case, we will later ask the tape
|
|
* how much bytes of the original request were
|
|
* actually transferred (we can't receive that
|
|
* information from the DMA engine on most chipsets).
|
|
*/
|
|
|
|
/*
|
|
* On the contrary, a DMA error is never expected;
|
|
* it usually indicates a hardware error or abort.
|
|
* If the tape crosses a filemark during a READ
|
|
* command, it will issue an irq and position itself
|
|
* after the filemark (not before). Only a partial
|
|
* data transfer will occur, but no DMA error.
|
|
* (AS, 19 Apr 2001)
|
|
*/
|
|
set_bit(PC_DMA_ERROR, &pc->flags);
|
|
} else {
|
|
pc->actually_transferred = pc->request_transfer;
|
|
idetape_update_buffers(pc);
|
|
}
|
|
debug_log(DBG_PROCS, "DMA finished\n");
|
|
|
|
}
|
|
|
|
/* No more interrupts */
|
|
if ((stat & DRQ_STAT) == 0) {
|
|
debug_log(DBG_SENSE, "Packet command completed, %d bytes"
|
|
" transferred\n", pc->actually_transferred);
|
|
|
|
clear_bit(PC_DMA_IN_PROGRESS, &pc->flags);
|
|
local_irq_enable();
|
|
|
|
#if SIMULATE_ERRORS
|
|
if ((pc->c[0] == WRITE_6 || pc->c[0] == READ_6) &&
|
|
(++error_sim_count % 100) == 0) {
|
|
printk(KERN_INFO "ide-tape: %s: simulating error\n",
|
|
tape->name);
|
|
stat |= ERR_STAT;
|
|
}
|
|
#endif
|
|
if ((stat & ERR_STAT) && pc->c[0] == REQUEST_SENSE)
|
|
stat &= ~ERR_STAT;
|
|
if ((stat & ERR_STAT) || test_bit(PC_DMA_ERROR, &pc->flags)) {
|
|
/* Error detected */
|
|
debug_log(DBG_ERR, "%s: I/O error\n", tape->name);
|
|
|
|
if (pc->c[0] == REQUEST_SENSE) {
|
|
printk(KERN_ERR "ide-tape: I/O error in request sense command\n");
|
|
return ide_do_reset(drive);
|
|
}
|
|
debug_log(DBG_ERR, "[cmd %x]: check condition\n",
|
|
pc->c[0]);
|
|
|
|
/* Retry operation */
|
|
return idetape_retry_pc(drive);
|
|
}
|
|
pc->error = 0;
|
|
if (test_bit(PC_WAIT_FOR_DSC, &pc->flags) &&
|
|
(stat & SEEK_STAT) == 0) {
|
|
/* Media access command */
|
|
tape->dsc_polling_start = jiffies;
|
|
tape->dsc_polling_frequency = IDETAPE_DSC_MA_FAST;
|
|
tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT;
|
|
/* Allow ide.c to handle other requests */
|
|
idetape_postpone_request(drive);
|
|
return ide_stopped;
|
|
}
|
|
if (tape->failed_pc == pc)
|
|
tape->failed_pc = NULL;
|
|
/* Command finished - Call the callback function */
|
|
return pc->callback(drive);
|
|
}
|
|
if (test_and_clear_bit(PC_DMA_IN_PROGRESS, &pc->flags)) {
|
|
printk(KERN_ERR "ide-tape: The tape wants to issue more "
|
|
"interrupts in DMA mode\n");
|
|
printk(KERN_ERR "ide-tape: DMA disabled, reverting to PIO\n");
|
|
ide_dma_off(drive);
|
|
return ide_do_reset(drive);
|
|
}
|
|
/* Get the number of bytes to transfer on this interrupt. */
|
|
bcount = (hwif->INB(IDE_BCOUNTH_REG) << 8) |
|
|
hwif->INB(IDE_BCOUNTL_REG);
|
|
|
|
ireason = hwif->INB(IDE_IREASON_REG);
|
|
|
|
if (ireason & CD) {
|
|
printk(KERN_ERR "ide-tape: CoD != 0 in idetape_pc_intr\n");
|
|
return ide_do_reset(drive);
|
|
}
|
|
if (((ireason & IO) == IO) == test_bit(PC_WRITING, &pc->flags)) {
|
|
/* Hopefully, we will never get here */
|
|
printk(KERN_ERR "ide-tape: We wanted to %s, ",
|
|
(ireason & IO) ? "Write" : "Read");
|
|
printk(KERN_ERR "ide-tape: but the tape wants us to %s !\n",
|
|
(ireason & IO) ? "Read" : "Write");
|
|
return ide_do_reset(drive);
|
|
}
|
|
if (!test_bit(PC_WRITING, &pc->flags)) {
|
|
/* Reading - Check that we have enough space */
|
|
temp = pc->actually_transferred + bcount;
|
|
if (temp > pc->request_transfer) {
|
|
if (temp > pc->buffer_size) {
|
|
printk(KERN_ERR "ide-tape: The tape wants to send us more data than expected - discarding data\n");
|
|
idetape_discard_data(drive, bcount);
|
|
ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL);
|
|
return ide_started;
|
|
}
|
|
debug_log(DBG_SENSE, "The tape wants to send us more "
|
|
"data than expected - allowing transfer\n");
|
|
|
|
}
|
|
}
|
|
if (test_bit(PC_WRITING, &pc->flags)) {
|
|
if (pc->bh != NULL)
|
|
idetape_output_buffers(drive, pc, bcount);
|
|
else
|
|
/* Write the current buffer */
|
|
hwif->atapi_output_bytes(drive, pc->current_position,
|
|
bcount);
|
|
} else {
|
|
if (pc->bh != NULL)
|
|
idetape_input_buffers(drive, pc, bcount);
|
|
else
|
|
/* Read the current buffer */
|
|
hwif->atapi_input_bytes(drive, pc->current_position,
|
|
bcount);
|
|
}
|
|
/* Update the current position */
|
|
pc->actually_transferred += bcount;
|
|
pc->current_position += bcount;
|
|
|
|
debug_log(DBG_SENSE, "[cmd %x] transferred %d bytes on that intr.\n",
|
|
pc->c[0], bcount);
|
|
|
|
/* And set the interrupt handler again */
|
|
ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL);
|
|
return ide_started;
|
|
}
|
|
|
|
/*
|
|
* Packet Command Interface
|
|
*
|
|
* The current Packet Command is available in tape->pc, and will not
|
|
* change until we finish handling it. Each packet command is associated
|
|
* with a callback function that will be called when the command is
|
|
* finished.
|
|
*
|
|
* The handling will be done in three stages:
|
|
*
|
|
* 1. idetape_issue_packet_command will send the packet command to the
|
|
* drive, and will set the interrupt handler to idetape_pc_intr.
|
|
*
|
|
* 2. On each interrupt, idetape_pc_intr will be called. This step
|
|
* will be repeated until the device signals us that no more
|
|
* interrupts will be issued.
|
|
*
|
|
* 3. ATAPI Tape media access commands have immediate status with a
|
|
* delayed process. In case of a successful initiation of a
|
|
* media access packet command, the DSC bit will be set when the
|
|
* actual execution of the command is finished.
|
|
* Since the tape drive will not issue an interrupt, we have to
|
|
* poll for this event. In this case, we define the request as
|
|
* "low priority request" by setting rq_status to
|
|
* IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and exit
|
|
* the driver.
|
|
*
|
|
* ide.c will then give higher priority to requests which
|
|
* originate from the other device, until will change rq_status
|
|
* to RQ_ACTIVE.
|
|
*
|
|
* 4. When the packet command is finished, it will be checked for errors.
|
|
*
|
|
* 5. In case an error was found, we queue a request sense packet
|
|
* command in front of the request queue and retry the operation
|
|
* up to IDETAPE_MAX_PC_RETRIES times.
|
|
*
|
|
* 6. In case no error was found, or we decided to give up and not
|
|
* to retry again, the callback function will be called and then
|
|
* we will handle the next request.
|
|
*
|
|
*/
|
|
static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive)
|
|
{
|
|
ide_hwif_t *hwif = drive->hwif;
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
idetape_pc_t *pc = tape->pc;
|
|
int retries = 100;
|
|
ide_startstop_t startstop;
|
|
u8 ireason;
|
|
|
|
if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
|
|
printk(KERN_ERR "ide-tape: Strange, packet command initiated yet DRQ isn't asserted\n");
|
|
return startstop;
|
|
}
|
|
ireason = hwif->INB(IDE_IREASON_REG);
|
|
while (retries-- && ((ireason & CD) == 0 || (ireason & IO))) {
|
|
printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while issuing "
|
|
"a packet command, retrying\n");
|
|
udelay(100);
|
|
ireason = hwif->INB(IDE_IREASON_REG);
|
|
if (retries == 0) {
|
|
printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while "
|
|
"issuing a packet command, ignoring\n");
|
|
ireason |= CD;
|
|
ireason &= ~IO;
|
|
}
|
|
}
|
|
if ((ireason & CD) == 0 || (ireason & IO)) {
|
|
printk(KERN_ERR "ide-tape: (IO,CoD) != (0,1) while issuing "
|
|
"a packet command\n");
|
|
return ide_do_reset(drive);
|
|
}
|
|
/* Set the interrupt routine */
|
|
ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL);
|
|
#ifdef CONFIG_BLK_DEV_IDEDMA
|
|
/* Begin DMA, if necessary */
|
|
if (test_bit(PC_DMA_IN_PROGRESS, &pc->flags))
|
|
hwif->dma_start(drive);
|
|
#endif
|
|
/* Send the actual packet */
|
|
HWIF(drive)->atapi_output_bytes(drive, pc->c, 12);
|
|
return ide_started;
|
|
}
|
|
|
|
static ide_startstop_t idetape_issue_packet_command (ide_drive_t *drive, idetape_pc_t *pc)
|
|
{
|
|
ide_hwif_t *hwif = drive->hwif;
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
int dma_ok = 0;
|
|
u16 bcount;
|
|
|
|
if (tape->pc->c[0] == REQUEST_SENSE &&
|
|
pc->c[0] == REQUEST_SENSE) {
|
|
printk(KERN_ERR "ide-tape: possible ide-tape.c bug - "
|
|
"Two request sense in serial were issued\n");
|
|
}
|
|
|
|
if (tape->failed_pc == NULL && pc->c[0] != REQUEST_SENSE)
|
|
tape->failed_pc = pc;
|
|
/* Set the current packet command */
|
|
tape->pc = pc;
|
|
|
|
if (pc->retries > IDETAPE_MAX_PC_RETRIES ||
|
|
test_bit(PC_ABORT, &pc->flags)) {
|
|
/*
|
|
* We will "abort" retrying a packet command in case
|
|
* a legitimate error code was received (crossing a
|
|
* filemark, or end of the media, for example).
|
|
*/
|
|
if (!test_bit(PC_ABORT, &pc->flags)) {
|
|
if (!(pc->c[0] == TEST_UNIT_READY &&
|
|
tape->sense_key == 2 && tape->asc == 4 &&
|
|
(tape->ascq == 1 || tape->ascq == 8))) {
|
|
printk(KERN_ERR "ide-tape: %s: I/O error, "
|
|
"pc = %2x, key = %2x, "
|
|
"asc = %2x, ascq = %2x\n",
|
|
tape->name, pc->c[0],
|
|
tape->sense_key, tape->asc,
|
|
tape->ascq);
|
|
}
|
|
/* Giving up */
|
|
pc->error = IDETAPE_ERROR_GENERAL;
|
|
}
|
|
tape->failed_pc = NULL;
|
|
return pc->callback(drive);
|
|
}
|
|
debug_log(DBG_SENSE, "Retry #%d, cmd = %02X\n", pc->retries, pc->c[0]);
|
|
|
|
pc->retries++;
|
|
/* We haven't transferred any data yet */
|
|
pc->actually_transferred = 0;
|
|
pc->current_position = pc->buffer;
|
|
/* Request to transfer the entire buffer at once */
|
|
bcount = pc->request_transfer;
|
|
|
|
if (test_and_clear_bit(PC_DMA_ERROR, &pc->flags)) {
|
|
printk(KERN_WARNING "ide-tape: DMA disabled, "
|
|
"reverting to PIO\n");
|
|
ide_dma_off(drive);
|
|
}
|
|
if (test_bit(PC_DMA_RECOMMENDED, &pc->flags) && drive->using_dma)
|
|
dma_ok = !hwif->dma_setup(drive);
|
|
|
|
ide_pktcmd_tf_load(drive, IDE_TFLAG_NO_SELECT_MASK |
|
|
IDE_TFLAG_OUT_DEVICE, bcount, dma_ok);
|
|
|
|
if (dma_ok) /* Will begin DMA later */
|
|
set_bit(PC_DMA_IN_PROGRESS, &pc->flags);
|
|
if (test_bit(IDETAPE_DRQ_INTERRUPT, &tape->flags)) {
|
|
ide_execute_command(drive, WIN_PACKETCMD, &idetape_transfer_pc,
|
|
IDETAPE_WAIT_CMD, NULL);
|
|
return ide_started;
|
|
} else {
|
|
hwif->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
|
|
return idetape_transfer_pc(drive);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* General packet command callback function.
|
|
*/
|
|
static ide_startstop_t idetape_pc_callback (ide_drive_t *drive)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
|
|
debug_log(DBG_PROCS, "Enter %s\n", __func__);
|
|
|
|
idetape_end_request(drive, tape->pc->error ? 0 : 1, 0);
|
|
return ide_stopped;
|
|
}
|
|
|
|
/*
|
|
* A mode sense command is used to "sense" tape parameters.
|
|
*/
|
|
static void idetape_create_mode_sense_cmd (idetape_pc_t *pc, u8 page_code)
|
|
{
|
|
idetape_init_pc(pc);
|
|
pc->c[0] = MODE_SENSE;
|
|
if (page_code != IDETAPE_BLOCK_DESCRIPTOR)
|
|
pc->c[1] = 8; /* DBD = 1 - Don't return block descriptors */
|
|
pc->c[2] = page_code;
|
|
/*
|
|
* Changed pc->c[3] to 0 (255 will at best return unused info).
|
|
*
|
|
* For SCSI this byte is defined as subpage instead of high byte
|
|
* of length and some IDE drives seem to interpret it this way
|
|
* and return an error when 255 is used.
|
|
*/
|
|
pc->c[3] = 0;
|
|
pc->c[4] = 255; /* (We will just discard data in that case) */
|
|
if (page_code == IDETAPE_BLOCK_DESCRIPTOR)
|
|
pc->request_transfer = 12;
|
|
else if (page_code == IDETAPE_CAPABILITIES_PAGE)
|
|
pc->request_transfer = 24;
|
|
else
|
|
pc->request_transfer = 50;
|
|
pc->callback = &idetape_pc_callback;
|
|
}
|
|
|
|
static void calculate_speeds(ide_drive_t *drive)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
int full = 125, empty = 75;
|
|
|
|
if (time_after(jiffies, tape->controlled_pipeline_head_time + 120 * HZ)) {
|
|
tape->controlled_previous_pipeline_head = tape->controlled_last_pipeline_head;
|
|
tape->controlled_previous_head_time = tape->controlled_pipeline_head_time;
|
|
tape->controlled_last_pipeline_head = tape->pipeline_head;
|
|
tape->controlled_pipeline_head_time = jiffies;
|
|
}
|
|
if (time_after(jiffies, tape->controlled_pipeline_head_time + 60 * HZ))
|
|
tape->controlled_pipeline_head_speed = (tape->pipeline_head - tape->controlled_last_pipeline_head) * 32 * HZ / (jiffies - tape->controlled_pipeline_head_time);
|
|
else if (time_after(jiffies, tape->controlled_previous_head_time))
|
|
tape->controlled_pipeline_head_speed = (tape->pipeline_head - tape->controlled_previous_pipeline_head) * 32 * HZ / (jiffies - tape->controlled_previous_head_time);
|
|
|
|
if (tape->nr_pending_stages < tape->max_stages /*- 1 */) {
|
|
/* -1 for read mode error recovery */
|
|
if (time_after(jiffies, tape->uncontrolled_previous_head_time + 10 * HZ)) {
|
|
tape->uncontrolled_pipeline_head_time = jiffies;
|
|
tape->uncontrolled_pipeline_head_speed = (tape->pipeline_head - tape->uncontrolled_previous_pipeline_head) * 32 * HZ / (jiffies - tape->uncontrolled_previous_head_time);
|
|
}
|
|
} else {
|
|
tape->uncontrolled_previous_head_time = jiffies;
|
|
tape->uncontrolled_previous_pipeline_head = tape->pipeline_head;
|
|
if (time_after(jiffies, tape->uncontrolled_pipeline_head_time + 30 * HZ)) {
|
|
tape->uncontrolled_pipeline_head_time = jiffies;
|
|
}
|
|
}
|
|
tape->pipeline_head_speed = max(tape->uncontrolled_pipeline_head_speed, tape->controlled_pipeline_head_speed);
|
|
if (tape->speed_control == 0) {
|
|
tape->max_insert_speed = 5000;
|
|
} else if (tape->speed_control == 1) {
|
|
if (tape->nr_pending_stages >= tape->max_stages / 2)
|
|
tape->max_insert_speed = tape->pipeline_head_speed +
|
|
(1100 - tape->pipeline_head_speed) * 2 * (tape->nr_pending_stages - tape->max_stages / 2) / tape->max_stages;
|
|
else
|
|
tape->max_insert_speed = 500 +
|
|
(tape->pipeline_head_speed - 500) * 2 * tape->nr_pending_stages / tape->max_stages;
|
|
if (tape->nr_pending_stages >= tape->max_stages * 99 / 100)
|
|
tape->max_insert_speed = 5000;
|
|
} else if (tape->speed_control == 2) {
|
|
tape->max_insert_speed = tape->pipeline_head_speed * empty / 100 +
|
|
(tape->pipeline_head_speed * full / 100 - tape->pipeline_head_speed * empty / 100) * tape->nr_pending_stages / tape->max_stages;
|
|
} else
|
|
tape->max_insert_speed = tape->speed_control;
|
|
tape->max_insert_speed = max(tape->max_insert_speed, 500);
|
|
}
|
|
|
|
static ide_startstop_t idetape_media_access_finished (ide_drive_t *drive)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
idetape_pc_t *pc = tape->pc;
|
|
u8 stat;
|
|
|
|
stat = ide_read_status(drive);
|
|
|
|
if (stat & SEEK_STAT) {
|
|
if (stat & ERR_STAT) {
|
|
/* Error detected */
|
|
if (pc->c[0] != TEST_UNIT_READY)
|
|
printk(KERN_ERR "ide-tape: %s: I/O error, ",
|
|
tape->name);
|
|
/* Retry operation */
|
|
return idetape_retry_pc(drive);
|
|
}
|
|
pc->error = 0;
|
|
if (tape->failed_pc == pc)
|
|
tape->failed_pc = NULL;
|
|
} else {
|
|
pc->error = IDETAPE_ERROR_GENERAL;
|
|
tape->failed_pc = NULL;
|
|
}
|
|
return pc->callback(drive);
|
|
}
|
|
|
|
static ide_startstop_t idetape_rw_callback (ide_drive_t *drive)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
struct request *rq = HWGROUP(drive)->rq;
|
|
int blocks = tape->pc->actually_transferred / tape->tape_block_size;
|
|
|
|
tape->avg_size += blocks * tape->tape_block_size;
|
|
tape->insert_size += blocks * tape->tape_block_size;
|
|
if (tape->insert_size > 1024 * 1024)
|
|
tape->measure_insert_time = 1;
|
|
if (tape->measure_insert_time) {
|
|
tape->measure_insert_time = 0;
|
|
tape->insert_time = jiffies;
|
|
tape->insert_size = 0;
|
|
}
|
|
if (time_after(jiffies, tape->insert_time))
|
|
tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time);
|
|
if (time_after_eq(jiffies, tape->avg_time + HZ)) {
|
|
tape->avg_speed = tape->avg_size * HZ / (jiffies - tape->avg_time) / 1024;
|
|
tape->avg_size = 0;
|
|
tape->avg_time = jiffies;
|
|
}
|
|
debug_log(DBG_PROCS, "Enter %s\n", __func__);
|
|
|
|
tape->first_frame_position += blocks;
|
|
rq->current_nr_sectors -= blocks;
|
|
|
|
if (!tape->pc->error)
|
|
idetape_end_request(drive, 1, 0);
|
|
else
|
|
idetape_end_request(drive, tape->pc->error, 0);
|
|
return ide_stopped;
|
|
}
|
|
|
|
static void idetape_create_read_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh)
|
|
{
|
|
idetape_init_pc(pc);
|
|
pc->c[0] = READ_6;
|
|
put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]);
|
|
pc->c[1] = 1;
|
|
pc->callback = &idetape_rw_callback;
|
|
pc->bh = bh;
|
|
atomic_set(&bh->b_count, 0);
|
|
pc->buffer = NULL;
|
|
pc->request_transfer = pc->buffer_size = length * tape->tape_block_size;
|
|
if (pc->request_transfer == tape->stage_size)
|
|
set_bit(PC_DMA_RECOMMENDED, &pc->flags);
|
|
}
|
|
|
|
static void idetape_create_read_buffer_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh)
|
|
{
|
|
int size = 32768;
|
|
struct idetape_bh *p = bh;
|
|
|
|
idetape_init_pc(pc);
|
|
pc->c[0] = READ_BUFFER;
|
|
pc->c[1] = IDETAPE_RETRIEVE_FAULTY_BLOCK;
|
|
pc->c[7] = size >> 8;
|
|
pc->c[8] = size & 0xff;
|
|
pc->callback = &idetape_pc_callback;
|
|
pc->bh = bh;
|
|
atomic_set(&bh->b_count, 0);
|
|
pc->buffer = NULL;
|
|
while (p) {
|
|
atomic_set(&p->b_count, 0);
|
|
p = p->b_reqnext;
|
|
}
|
|
pc->request_transfer = pc->buffer_size = size;
|
|
}
|
|
|
|
static void idetape_create_write_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct idetape_bh *bh)
|
|
{
|
|
idetape_init_pc(pc);
|
|
pc->c[0] = WRITE_6;
|
|
put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]);
|
|
pc->c[1] = 1;
|
|
pc->callback = &idetape_rw_callback;
|
|
set_bit(PC_WRITING, &pc->flags);
|
|
pc->bh = bh;
|
|
pc->b_data = bh->b_data;
|
|
pc->b_count = atomic_read(&bh->b_count);
|
|
pc->buffer = NULL;
|
|
pc->request_transfer = pc->buffer_size = length * tape->tape_block_size;
|
|
if (pc->request_transfer == tape->stage_size)
|
|
set_bit(PC_DMA_RECOMMENDED, &pc->flags);
|
|
}
|
|
|
|
/*
|
|
* idetape_do_request is our request handling function.
|
|
*/
|
|
static ide_startstop_t idetape_do_request(ide_drive_t *drive,
|
|
struct request *rq, sector_t block)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
idetape_pc_t *pc = NULL;
|
|
struct request *postponed_rq = tape->postponed_rq;
|
|
u8 stat;
|
|
|
|
debug_log(DBG_SENSE, "sector: %ld, nr_sectors: %ld,"
|
|
" current_nr_sectors: %d\n",
|
|
rq->sector, rq->nr_sectors, rq->current_nr_sectors);
|
|
|
|
if (!blk_special_request(rq)) {
|
|
/*
|
|
* We do not support buffer cache originated requests.
|
|
*/
|
|
printk(KERN_NOTICE "ide-tape: %s: Unsupported request in "
|
|
"request queue (%d)\n", drive->name, rq->cmd_type);
|
|
ide_end_request(drive, 0, 0);
|
|
return ide_stopped;
|
|
}
|
|
|
|
/*
|
|
* Retry a failed packet command
|
|
*/
|
|
if (tape->failed_pc != NULL &&
|
|
tape->pc->c[0] == REQUEST_SENSE) {
|
|
return idetape_issue_packet_command(drive, tape->failed_pc);
|
|
}
|
|
if (postponed_rq != NULL)
|
|
if (rq != postponed_rq) {
|
|
printk(KERN_ERR "ide-tape: ide-tape.c bug - "
|
|
"Two DSC requests were queued\n");
|
|
idetape_end_request(drive, 0, 0);
|
|
return ide_stopped;
|
|
}
|
|
|
|
tape->postponed_rq = NULL;
|
|
|
|
/*
|
|
* If the tape is still busy, postpone our request and service
|
|
* the other device meanwhile.
|
|
*/
|
|
stat = ide_read_status(drive);
|
|
|
|
if (!drive->dsc_overlap && !(rq->cmd[0] & REQ_IDETAPE_PC2))
|
|
set_bit(IDETAPE_IGNORE_DSC, &tape->flags);
|
|
|
|
if (drive->post_reset == 1) {
|
|
set_bit(IDETAPE_IGNORE_DSC, &tape->flags);
|
|
drive->post_reset = 0;
|
|
}
|
|
|
|
if (tape->tape_still_time > 100 && tape->tape_still_time < 200)
|
|
tape->measure_insert_time = 1;
|
|
if (time_after(jiffies, tape->insert_time))
|
|
tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time);
|
|
calculate_speeds(drive);
|
|
if (!test_and_clear_bit(IDETAPE_IGNORE_DSC, &tape->flags) &&
|
|
(stat & SEEK_STAT) == 0) {
|
|
if (postponed_rq == NULL) {
|
|
tape->dsc_polling_start = jiffies;
|
|
tape->dsc_polling_frequency = tape->best_dsc_rw_frequency;
|
|
tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT;
|
|
} else if (time_after(jiffies, tape->dsc_timeout)) {
|
|
printk(KERN_ERR "ide-tape: %s: DSC timeout\n",
|
|
tape->name);
|
|
if (rq->cmd[0] & REQ_IDETAPE_PC2) {
|
|
idetape_media_access_finished(drive);
|
|
return ide_stopped;
|
|
} else {
|
|
return ide_do_reset(drive);
|
|
}
|
|
} else if (time_after(jiffies, tape->dsc_polling_start + IDETAPE_DSC_MA_THRESHOLD))
|
|
tape->dsc_polling_frequency = IDETAPE_DSC_MA_SLOW;
|
|
idetape_postpone_request(drive);
|
|
return ide_stopped;
|
|
}
|
|
if (rq->cmd[0] & REQ_IDETAPE_READ) {
|
|
tape->buffer_head++;
|
|
tape->postpone_cnt = 0;
|
|
pc = idetape_next_pc_storage(drive);
|
|
idetape_create_read_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special);
|
|
goto out;
|
|
}
|
|
if (rq->cmd[0] & REQ_IDETAPE_WRITE) {
|
|
tape->buffer_head++;
|
|
tape->postpone_cnt = 0;
|
|
pc = idetape_next_pc_storage(drive);
|
|
idetape_create_write_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special);
|
|
goto out;
|
|
}
|
|
if (rq->cmd[0] & REQ_IDETAPE_READ_BUFFER) {
|
|
tape->postpone_cnt = 0;
|
|
pc = idetape_next_pc_storage(drive);
|
|
idetape_create_read_buffer_cmd(tape, pc, rq->current_nr_sectors, (struct idetape_bh *)rq->special);
|
|
goto out;
|
|
}
|
|
if (rq->cmd[0] & REQ_IDETAPE_PC1) {
|
|
pc = (idetape_pc_t *) rq->buffer;
|
|
rq->cmd[0] &= ~(REQ_IDETAPE_PC1);
|
|
rq->cmd[0] |= REQ_IDETAPE_PC2;
|
|
goto out;
|
|
}
|
|
if (rq->cmd[0] & REQ_IDETAPE_PC2) {
|
|
idetape_media_access_finished(drive);
|
|
return ide_stopped;
|
|
}
|
|
BUG();
|
|
out:
|
|
return idetape_issue_packet_command(drive, pc);
|
|
}
|
|
|
|
/*
|
|
* Pipeline related functions
|
|
*/
|
|
static inline int idetape_pipeline_active (idetape_tape_t *tape)
|
|
{
|
|
int rc1, rc2;
|
|
|
|
rc1 = test_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags);
|
|
rc2 = (tape->active_data_request != NULL);
|
|
return rc1;
|
|
}
|
|
|
|
/*
|
|
* idetape_kmalloc_stage uses __get_free_page to allocate a pipeline
|
|
* stage, along with all the necessary small buffers which together make
|
|
* a buffer of size tape->stage_size (or a bit more). We attempt to
|
|
* combine sequential pages as much as possible.
|
|
*
|
|
* Returns a pointer to the new allocated stage, or NULL if we
|
|
* can't (or don't want to) allocate a stage.
|
|
*
|
|
* Pipeline stages are optional and are used to increase performance.
|
|
* If we can't allocate them, we'll manage without them.
|
|
*/
|
|
static idetape_stage_t *__idetape_kmalloc_stage (idetape_tape_t *tape, int full, int clear)
|
|
{
|
|
idetape_stage_t *stage;
|
|
struct idetape_bh *prev_bh, *bh;
|
|
int pages = tape->pages_per_stage;
|
|
char *b_data = NULL;
|
|
|
|
if ((stage = kmalloc(sizeof (idetape_stage_t),GFP_KERNEL)) == NULL)
|
|
return NULL;
|
|
stage->next = NULL;
|
|
|
|
bh = stage->bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
|
|
if (bh == NULL)
|
|
goto abort;
|
|
bh->b_reqnext = NULL;
|
|
if ((bh->b_data = (char *) __get_free_page (GFP_KERNEL)) == NULL)
|
|
goto abort;
|
|
if (clear)
|
|
memset(bh->b_data, 0, PAGE_SIZE);
|
|
bh->b_size = PAGE_SIZE;
|
|
atomic_set(&bh->b_count, full ? bh->b_size : 0);
|
|
|
|
while (--pages) {
|
|
if ((b_data = (char *) __get_free_page (GFP_KERNEL)) == NULL)
|
|
goto abort;
|
|
if (clear)
|
|
memset(b_data, 0, PAGE_SIZE);
|
|
if (bh->b_data == b_data + PAGE_SIZE) {
|
|
bh->b_size += PAGE_SIZE;
|
|
bh->b_data -= PAGE_SIZE;
|
|
if (full)
|
|
atomic_add(PAGE_SIZE, &bh->b_count);
|
|
continue;
|
|
}
|
|
if (b_data == bh->b_data + bh->b_size) {
|
|
bh->b_size += PAGE_SIZE;
|
|
if (full)
|
|
atomic_add(PAGE_SIZE, &bh->b_count);
|
|
continue;
|
|
}
|
|
prev_bh = bh;
|
|
if ((bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL)) == NULL) {
|
|
free_page((unsigned long) b_data);
|
|
goto abort;
|
|
}
|
|
bh->b_reqnext = NULL;
|
|
bh->b_data = b_data;
|
|
bh->b_size = PAGE_SIZE;
|
|
atomic_set(&bh->b_count, full ? bh->b_size : 0);
|
|
prev_bh->b_reqnext = bh;
|
|
}
|
|
bh->b_size -= tape->excess_bh_size;
|
|
if (full)
|
|
atomic_sub(tape->excess_bh_size, &bh->b_count);
|
|
return stage;
|
|
abort:
|
|
__idetape_kfree_stage(stage);
|
|
return NULL;
|
|
}
|
|
|
|
static idetape_stage_t *idetape_kmalloc_stage (idetape_tape_t *tape)
|
|
{
|
|
idetape_stage_t *cache_stage = tape->cache_stage;
|
|
|
|
debug_log(DBG_PROCS, "Enter %s\n", __func__);
|
|
|
|
if (tape->nr_stages >= tape->max_stages)
|
|
return NULL;
|
|
if (cache_stage != NULL) {
|
|
tape->cache_stage = NULL;
|
|
return cache_stage;
|
|
}
|
|
return __idetape_kmalloc_stage(tape, 0, 0);
|
|
}
|
|
|
|
static int idetape_copy_stage_from_user (idetape_tape_t *tape, idetape_stage_t *stage, const char __user *buf, int n)
|
|
{
|
|
struct idetape_bh *bh = tape->bh;
|
|
int count;
|
|
int ret = 0;
|
|
|
|
while (n) {
|
|
if (bh == NULL) {
|
|
printk(KERN_ERR "ide-tape: bh == NULL in "
|
|
"idetape_copy_stage_from_user\n");
|
|
return 1;
|
|
}
|
|
count = min((unsigned int)(bh->b_size - atomic_read(&bh->b_count)), (unsigned int)n);
|
|
if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf, count))
|
|
ret = 1;
|
|
n -= count;
|
|
atomic_add(count, &bh->b_count);
|
|
buf += count;
|
|
if (atomic_read(&bh->b_count) == bh->b_size) {
|
|
bh = bh->b_reqnext;
|
|
if (bh)
|
|
atomic_set(&bh->b_count, 0);
|
|
}
|
|
}
|
|
tape->bh = bh;
|
|
return ret;
|
|
}
|
|
|
|
static int idetape_copy_stage_to_user (idetape_tape_t *tape, char __user *buf, idetape_stage_t *stage, int n)
|
|
{
|
|
struct idetape_bh *bh = tape->bh;
|
|
int count;
|
|
int ret = 0;
|
|
|
|
while (n) {
|
|
if (bh == NULL) {
|
|
printk(KERN_ERR "ide-tape: bh == NULL in "
|
|
"idetape_copy_stage_to_user\n");
|
|
return 1;
|
|
}
|
|
count = min(tape->b_count, n);
|
|
if (copy_to_user(buf, tape->b_data, count))
|
|
ret = 1;
|
|
n -= count;
|
|
tape->b_data += count;
|
|
tape->b_count -= count;
|
|
buf += count;
|
|
if (!tape->b_count) {
|
|
tape->bh = bh = bh->b_reqnext;
|
|
if (bh) {
|
|
tape->b_data = bh->b_data;
|
|
tape->b_count = atomic_read(&bh->b_count);
|
|
}
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static void idetape_init_merge_stage (idetape_tape_t *tape)
|
|
{
|
|
struct idetape_bh *bh = tape->merge_stage->bh;
|
|
|
|
tape->bh = bh;
|
|
if (tape->chrdev_direction == idetape_direction_write)
|
|
atomic_set(&bh->b_count, 0);
|
|
else {
|
|
tape->b_data = bh->b_data;
|
|
tape->b_count = atomic_read(&bh->b_count);
|
|
}
|
|
}
|
|
|
|
static void idetape_switch_buffers (idetape_tape_t *tape, idetape_stage_t *stage)
|
|
{
|
|
struct idetape_bh *tmp;
|
|
|
|
tmp = stage->bh;
|
|
stage->bh = tape->merge_stage->bh;
|
|
tape->merge_stage->bh = tmp;
|
|
idetape_init_merge_stage(tape);
|
|
}
|
|
|
|
/*
|
|
* idetape_add_stage_tail adds a new stage at the end of the pipeline.
|
|
*/
|
|
static void idetape_add_stage_tail (ide_drive_t *drive,idetape_stage_t *stage)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
unsigned long flags;
|
|
|
|
debug_log(DBG_PROCS, "Enter %s\n", __func__);
|
|
|
|
spin_lock_irqsave(&tape->spinlock, flags);
|
|
stage->next = NULL;
|
|
if (tape->last_stage != NULL)
|
|
tape->last_stage->next=stage;
|
|
else
|
|
tape->first_stage = tape->next_stage=stage;
|
|
tape->last_stage = stage;
|
|
if (tape->next_stage == NULL)
|
|
tape->next_stage = tape->last_stage;
|
|
tape->nr_stages++;
|
|
tape->nr_pending_stages++;
|
|
spin_unlock_irqrestore(&tape->spinlock, flags);
|
|
}
|
|
|
|
/*
|
|
* idetape_wait_for_request installs a completion in a pending request
|
|
* and sleeps until it is serviced.
|
|
*
|
|
* The caller should ensure that the request will not be serviced
|
|
* before we install the completion (usually by disabling interrupts).
|
|
*/
|
|
static void idetape_wait_for_request (ide_drive_t *drive, struct request *rq)
|
|
{
|
|
DECLARE_COMPLETION_ONSTACK(wait);
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
|
|
if (rq == NULL || !blk_special_request(rq)) {
|
|
printk (KERN_ERR "ide-tape: bug: Trying to sleep on non-valid request\n");
|
|
return;
|
|
}
|
|
rq->end_io_data = &wait;
|
|
rq->end_io = blk_end_sync_rq;
|
|
spin_unlock_irq(&tape->spinlock);
|
|
wait_for_completion(&wait);
|
|
/* The stage and its struct request have been deallocated */
|
|
spin_lock_irq(&tape->spinlock);
|
|
}
|
|
|
|
static ide_startstop_t idetape_read_position_callback(ide_drive_t *drive)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
u8 *readpos = tape->pc->buffer;
|
|
|
|
debug_log(DBG_PROCS, "Enter %s\n", __func__);
|
|
|
|
if (!tape->pc->error) {
|
|
debug_log(DBG_SENSE, "BOP - %s\n",
|
|
(readpos[0] & 0x80) ? "Yes" : "No");
|
|
debug_log(DBG_SENSE, "EOP - %s\n",
|
|
(readpos[0] & 0x40) ? "Yes" : "No");
|
|
|
|
if (readpos[0] & 0x4) {
|
|
printk(KERN_INFO "ide-tape: Block location is unknown"
|
|
"to the tape\n");
|
|
clear_bit(IDETAPE_ADDRESS_VALID, &tape->flags);
|
|
idetape_end_request(drive, 0, 0);
|
|
} else {
|
|
debug_log(DBG_SENSE, "Block Location - %u\n",
|
|
be32_to_cpu(*(u32 *)&readpos[4]));
|
|
|
|
tape->partition = readpos[1];
|
|
tape->first_frame_position =
|
|
be32_to_cpu(*(u32 *)&readpos[4]);
|
|
tape->last_frame_position =
|
|
be32_to_cpu(*(u32 *)&readpos[8]);
|
|
tape->blocks_in_buffer = readpos[15];
|
|
set_bit(IDETAPE_ADDRESS_VALID, &tape->flags);
|
|
idetape_end_request(drive, 1, 0);
|
|
}
|
|
} else {
|
|
idetape_end_request(drive, 0, 0);
|
|
}
|
|
return ide_stopped;
|
|
}
|
|
|
|
/*
|
|
* idetape_create_write_filemark_cmd will:
|
|
*
|
|
* 1. Write a filemark if write_filemark=1.
|
|
* 2. Flush the device buffers without writing a filemark
|
|
* if write_filemark=0.
|
|
*
|
|
*/
|
|
static void idetape_create_write_filemark_cmd (ide_drive_t *drive, idetape_pc_t *pc,int write_filemark)
|
|
{
|
|
idetape_init_pc(pc);
|
|
pc->c[0] = WRITE_FILEMARKS;
|
|
pc->c[4] = write_filemark;
|
|
set_bit(PC_WAIT_FOR_DSC, &pc->flags);
|
|
pc->callback = &idetape_pc_callback;
|
|
}
|
|
|
|
static void idetape_create_test_unit_ready_cmd(idetape_pc_t *pc)
|
|
{
|
|
idetape_init_pc(pc);
|
|
pc->c[0] = TEST_UNIT_READY;
|
|
pc->callback = &idetape_pc_callback;
|
|
}
|
|
|
|
/*
|
|
* idetape_queue_pc_tail is based on the following functions:
|
|
*
|
|
* ide_do_drive_cmd from ide.c
|
|
* cdrom_queue_request and cdrom_queue_packet_command from ide-cd.c
|
|
*
|
|
* We add a special packet command request to the tail of the request
|
|
* queue, and wait for it to be serviced.
|
|
*
|
|
* This is not to be called from within the request handling part
|
|
* of the driver ! We allocate here data in the stack, and it is valid
|
|
* until the request is finished. This is not the case for the bottom
|
|
* part of the driver, where we are always leaving the functions to wait
|
|
* for an interrupt or a timer event.
|
|
*
|
|
* From the bottom part of the driver, we should allocate safe memory
|
|
* using idetape_next_pc_storage and idetape_next_rq_storage, and add
|
|
* the request to the request list without waiting for it to be serviced !
|
|
* In that case, we usually use idetape_queue_pc_head.
|
|
*/
|
|
static int __idetape_queue_pc_tail (ide_drive_t *drive, idetape_pc_t *pc)
|
|
{
|
|
struct ide_tape_obj *tape = drive->driver_data;
|
|
struct request rq;
|
|
|
|
idetape_init_rq(&rq, REQ_IDETAPE_PC1);
|
|
rq.buffer = (char *) pc;
|
|
rq.rq_disk = tape->disk;
|
|
return ide_do_drive_cmd(drive, &rq, ide_wait);
|
|
}
|
|
|
|
static void idetape_create_load_unload_cmd (ide_drive_t *drive, idetape_pc_t *pc,int cmd)
|
|
{
|
|
idetape_init_pc(pc);
|
|
pc->c[0] = START_STOP;
|
|
pc->c[4] = cmd;
|
|
set_bit(PC_WAIT_FOR_DSC, &pc->flags);
|
|
pc->callback = &idetape_pc_callback;
|
|
}
|
|
|
|
static int idetape_wait_ready(ide_drive_t *drive, unsigned long timeout)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
idetape_pc_t pc;
|
|
int load_attempted = 0;
|
|
|
|
/*
|
|
* Wait for the tape to become ready
|
|
*/
|
|
set_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags);
|
|
timeout += jiffies;
|
|
while (time_before(jiffies, timeout)) {
|
|
idetape_create_test_unit_ready_cmd(&pc);
|
|
if (!__idetape_queue_pc_tail(drive, &pc))
|
|
return 0;
|
|
if ((tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2)
|
|
|| (tape->asc == 0x3A)) { /* no media */
|
|
if (load_attempted)
|
|
return -ENOMEDIUM;
|
|
idetape_create_load_unload_cmd(drive, &pc, IDETAPE_LU_LOAD_MASK);
|
|
__idetape_queue_pc_tail(drive, &pc);
|
|
load_attempted = 1;
|
|
/* not about to be ready */
|
|
} else if (!(tape->sense_key == 2 && tape->asc == 4 &&
|
|
(tape->ascq == 1 || tape->ascq == 8)))
|
|
return -EIO;
|
|
msleep(100);
|
|
}
|
|
return -EIO;
|
|
}
|
|
|
|
static int idetape_queue_pc_tail (ide_drive_t *drive,idetape_pc_t *pc)
|
|
{
|
|
return __idetape_queue_pc_tail(drive, pc);
|
|
}
|
|
|
|
static int idetape_flush_tape_buffers (ide_drive_t *drive)
|
|
{
|
|
idetape_pc_t pc;
|
|
int rc;
|
|
|
|
idetape_create_write_filemark_cmd(drive, &pc, 0);
|
|
if ((rc = idetape_queue_pc_tail(drive, &pc)))
|
|
return rc;
|
|
idetape_wait_ready(drive, 60 * 5 * HZ);
|
|
return 0;
|
|
}
|
|
|
|
static void idetape_create_read_position_cmd (idetape_pc_t *pc)
|
|
{
|
|
idetape_init_pc(pc);
|
|
pc->c[0] = READ_POSITION;
|
|
pc->request_transfer = 20;
|
|
pc->callback = &idetape_read_position_callback;
|
|
}
|
|
|
|
static int idetape_read_position (ide_drive_t *drive)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
idetape_pc_t pc;
|
|
int position;
|
|
|
|
debug_log(DBG_PROCS, "Enter %s\n", __func__);
|
|
|
|
idetape_create_read_position_cmd(&pc);
|
|
if (idetape_queue_pc_tail(drive, &pc))
|
|
return -1;
|
|
position = tape->first_frame_position;
|
|
return position;
|
|
}
|
|
|
|
static void idetape_create_locate_cmd (ide_drive_t *drive, idetape_pc_t *pc, unsigned int block, u8 partition, int skip)
|
|
{
|
|
idetape_init_pc(pc);
|
|
pc->c[0] = POSITION_TO_ELEMENT;
|
|
pc->c[1] = 2;
|
|
put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[3]);
|
|
pc->c[8] = partition;
|
|
set_bit(PC_WAIT_FOR_DSC, &pc->flags);
|
|
pc->callback = &idetape_pc_callback;
|
|
}
|
|
|
|
static int idetape_create_prevent_cmd (ide_drive_t *drive, idetape_pc_t *pc, int prevent)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
|
|
/* device supports locking according to capabilities page */
|
|
if (!(tape->caps[6] & 0x01))
|
|
return 0;
|
|
|
|
idetape_init_pc(pc);
|
|
pc->c[0] = ALLOW_MEDIUM_REMOVAL;
|
|
pc->c[4] = prevent;
|
|
pc->callback = &idetape_pc_callback;
|
|
return 1;
|
|
}
|
|
|
|
static int __idetape_discard_read_pipeline (ide_drive_t *drive)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
unsigned long flags;
|
|
int cnt;
|
|
|
|
if (tape->chrdev_direction != idetape_direction_read)
|
|
return 0;
|
|
|
|
/* Remove merge stage. */
|
|
cnt = tape->merge_stage_size / tape->tape_block_size;
|
|
if (test_and_clear_bit(IDETAPE_FILEMARK, &tape->flags))
|
|
++cnt; /* Filemarks count as 1 sector */
|
|
tape->merge_stage_size = 0;
|
|
if (tape->merge_stage != NULL) {
|
|
__idetape_kfree_stage(tape->merge_stage);
|
|
tape->merge_stage = NULL;
|
|
}
|
|
|
|
/* Clear pipeline flags. */
|
|
clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
|
|
tape->chrdev_direction = idetape_direction_none;
|
|
|
|
/* Remove pipeline stages. */
|
|
if (tape->first_stage == NULL)
|
|
return 0;
|
|
|
|
spin_lock_irqsave(&tape->spinlock, flags);
|
|
tape->next_stage = NULL;
|
|
if (idetape_pipeline_active(tape))
|
|
idetape_wait_for_request(drive, tape->active_data_request);
|
|
spin_unlock_irqrestore(&tape->spinlock, flags);
|
|
|
|
while (tape->first_stage != NULL) {
|
|
struct request *rq_ptr = &tape->first_stage->rq;
|
|
|
|
cnt += rq_ptr->nr_sectors - rq_ptr->current_nr_sectors;
|
|
if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK)
|
|
++cnt;
|
|
idetape_remove_stage_head(drive);
|
|
}
|
|
tape->nr_pending_stages = 0;
|
|
tape->max_stages = tape->min_pipeline;
|
|
return cnt;
|
|
}
|
|
|
|
/*
|
|
* idetape_position_tape positions the tape to the requested block
|
|
* using the LOCATE packet command. A READ POSITION command is then
|
|
* issued to check where we are positioned.
|
|
*
|
|
* Like all higher level operations, we queue the commands at the tail
|
|
* of the request queue and wait for their completion.
|
|
*
|
|
*/
|
|
static int idetape_position_tape (ide_drive_t *drive, unsigned int block, u8 partition, int skip)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
int retval;
|
|
idetape_pc_t pc;
|
|
|
|
if (tape->chrdev_direction == idetape_direction_read)
|
|
__idetape_discard_read_pipeline(drive);
|
|
idetape_wait_ready(drive, 60 * 5 * HZ);
|
|
idetape_create_locate_cmd(drive, &pc, block, partition, skip);
|
|
retval = idetape_queue_pc_tail(drive, &pc);
|
|
if (retval)
|
|
return (retval);
|
|
|
|
idetape_create_read_position_cmd(&pc);
|
|
return (idetape_queue_pc_tail(drive, &pc));
|
|
}
|
|
|
|
static void idetape_discard_read_pipeline (ide_drive_t *drive, int restore_position)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
int cnt;
|
|
int seek, position;
|
|
|
|
cnt = __idetape_discard_read_pipeline(drive);
|
|
if (restore_position) {
|
|
position = idetape_read_position(drive);
|
|
seek = position > cnt ? position - cnt : 0;
|
|
if (idetape_position_tape(drive, seek, 0, 0)) {
|
|
printk(KERN_INFO "ide-tape: %s: position_tape failed in discard_pipeline()\n", tape->name);
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* idetape_queue_rw_tail generates a read/write request for the block
|
|
* device interface and wait for it to be serviced.
|
|
*/
|
|
static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks, struct idetape_bh *bh)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
struct request rq;
|
|
|
|
debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd);
|
|
|
|
if (idetape_pipeline_active(tape)) {
|
|
printk(KERN_ERR "ide-tape: bug: the pipeline is active in %s\n",
|
|
__func__);
|
|
return (0);
|
|
}
|
|
|
|
idetape_init_rq(&rq, cmd);
|
|
rq.rq_disk = tape->disk;
|
|
rq.special = (void *)bh;
|
|
rq.sector = tape->first_frame_position;
|
|
rq.nr_sectors = rq.current_nr_sectors = blocks;
|
|
(void) ide_do_drive_cmd(drive, &rq, ide_wait);
|
|
|
|
if ((cmd & (REQ_IDETAPE_READ | REQ_IDETAPE_WRITE)) == 0)
|
|
return 0;
|
|
|
|
if (tape->merge_stage)
|
|
idetape_init_merge_stage(tape);
|
|
if (rq.errors == IDETAPE_ERROR_GENERAL)
|
|
return -EIO;
|
|
return (tape->tape_block_size * (blocks-rq.current_nr_sectors));
|
|
}
|
|
|
|
/*
|
|
* idetape_insert_pipeline_into_queue is used to start servicing the
|
|
* pipeline stages, starting from tape->next_stage.
|
|
*/
|
|
static void idetape_insert_pipeline_into_queue (ide_drive_t *drive)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
|
|
if (tape->next_stage == NULL)
|
|
return;
|
|
if (!idetape_pipeline_active(tape)) {
|
|
set_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags);
|
|
idetape_activate_next_stage(drive);
|
|
(void) ide_do_drive_cmd(drive, tape->active_data_request, ide_end);
|
|
}
|
|
}
|
|
|
|
static void idetape_create_inquiry_cmd (idetape_pc_t *pc)
|
|
{
|
|
idetape_init_pc(pc);
|
|
pc->c[0] = INQUIRY;
|
|
pc->c[4] = pc->request_transfer = 254;
|
|
pc->callback = &idetape_pc_callback;
|
|
}
|
|
|
|
static void idetape_create_rewind_cmd (ide_drive_t *drive, idetape_pc_t *pc)
|
|
{
|
|
idetape_init_pc(pc);
|
|
pc->c[0] = REZERO_UNIT;
|
|
set_bit(PC_WAIT_FOR_DSC, &pc->flags);
|
|
pc->callback = &idetape_pc_callback;
|
|
}
|
|
|
|
static void idetape_create_erase_cmd (idetape_pc_t *pc)
|
|
{
|
|
idetape_init_pc(pc);
|
|
pc->c[0] = ERASE;
|
|
pc->c[1] = 1;
|
|
set_bit(PC_WAIT_FOR_DSC, &pc->flags);
|
|
pc->callback = &idetape_pc_callback;
|
|
}
|
|
|
|
static void idetape_create_space_cmd (idetape_pc_t *pc,int count, u8 cmd)
|
|
{
|
|
idetape_init_pc(pc);
|
|
pc->c[0] = SPACE;
|
|
put_unaligned(cpu_to_be32(count), (unsigned int *) &pc->c[1]);
|
|
pc->c[1] = cmd;
|
|
set_bit(PC_WAIT_FOR_DSC, &pc->flags);
|
|
pc->callback = &idetape_pc_callback;
|
|
}
|
|
|
|
static void idetape_wait_first_stage (ide_drive_t *drive)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
unsigned long flags;
|
|
|
|
if (tape->first_stage == NULL)
|
|
return;
|
|
spin_lock_irqsave(&tape->spinlock, flags);
|
|
if (tape->active_stage == tape->first_stage)
|
|
idetape_wait_for_request(drive, tape->active_data_request);
|
|
spin_unlock_irqrestore(&tape->spinlock, flags);
|
|
}
|
|
|
|
/*
|
|
* idetape_add_chrdev_write_request tries to add a character device
|
|
* originated write request to our pipeline. In case we don't succeed,
|
|
* we revert to non-pipelined operation mode for this request.
|
|
*
|
|
* 1. Try to allocate a new pipeline stage.
|
|
* 2. If we can't, wait for more and more requests to be serviced
|
|
* and try again each time.
|
|
* 3. If we still can't allocate a stage, fallback to
|
|
* non-pipelined operation mode for this request.
|
|
*/
|
|
static int idetape_add_chrdev_write_request (ide_drive_t *drive, int blocks)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
idetape_stage_t *new_stage;
|
|
unsigned long flags;
|
|
struct request *rq;
|
|
|
|
debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
|
|
|
|
/*
|
|
* Attempt to allocate a new stage.
|
|
* Pay special attention to possible race conditions.
|
|
*/
|
|
while ((new_stage = idetape_kmalloc_stage(tape)) == NULL) {
|
|
spin_lock_irqsave(&tape->spinlock, flags);
|
|
if (idetape_pipeline_active(tape)) {
|
|
idetape_wait_for_request(drive, tape->active_data_request);
|
|
spin_unlock_irqrestore(&tape->spinlock, flags);
|
|
} else {
|
|
spin_unlock_irqrestore(&tape->spinlock, flags);
|
|
idetape_insert_pipeline_into_queue(drive);
|
|
if (idetape_pipeline_active(tape))
|
|
continue;
|
|
/*
|
|
* Linux is short on memory. Fallback to
|
|
* non-pipelined operation mode for this request.
|
|
*/
|
|
return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, tape->merge_stage->bh);
|
|
}
|
|
}
|
|
rq = &new_stage->rq;
|
|
idetape_init_rq(rq, REQ_IDETAPE_WRITE);
|
|
/* Doesn't actually matter - We always assume sequential access */
|
|
rq->sector = tape->first_frame_position;
|
|
rq->nr_sectors = rq->current_nr_sectors = blocks;
|
|
|
|
idetape_switch_buffers(tape, new_stage);
|
|
idetape_add_stage_tail(drive, new_stage);
|
|
tape->pipeline_head++;
|
|
calculate_speeds(drive);
|
|
|
|
/*
|
|
* Estimate whether the tape has stopped writing by checking
|
|
* if our write pipeline is currently empty. If we are not
|
|
* writing anymore, wait for the pipeline to be full enough
|
|
* (90%) before starting to service requests, so that we will
|
|
* be able to keep up with the higher speeds of the tape.
|
|
*/
|
|
if (!idetape_pipeline_active(tape)) {
|
|
if (tape->nr_stages >= tape->max_stages * 9 / 10 ||
|
|
tape->nr_stages >= tape->max_stages - tape->uncontrolled_pipeline_head_speed * 3 * 1024 / tape->tape_block_size) {
|
|
tape->measure_insert_time = 1;
|
|
tape->insert_time = jiffies;
|
|
tape->insert_size = 0;
|
|
tape->insert_speed = 0;
|
|
idetape_insert_pipeline_into_queue(drive);
|
|
}
|
|
}
|
|
if (test_and_clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags))
|
|
/* Return a deferred error */
|
|
return -EIO;
|
|
return blocks;
|
|
}
|
|
|
|
/*
|
|
* idetape_wait_for_pipeline will wait until all pending pipeline
|
|
* requests are serviced. Typically called on device close.
|
|
*/
|
|
static void idetape_wait_for_pipeline (ide_drive_t *drive)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
unsigned long flags;
|
|
|
|
while (tape->next_stage || idetape_pipeline_active(tape)) {
|
|
idetape_insert_pipeline_into_queue(drive);
|
|
spin_lock_irqsave(&tape->spinlock, flags);
|
|
if (idetape_pipeline_active(tape))
|
|
idetape_wait_for_request(drive, tape->active_data_request);
|
|
spin_unlock_irqrestore(&tape->spinlock, flags);
|
|
}
|
|
}
|
|
|
|
static void idetape_empty_write_pipeline (ide_drive_t *drive)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
int blocks, min;
|
|
struct idetape_bh *bh;
|
|
|
|
if (tape->chrdev_direction != idetape_direction_write) {
|
|
printk(KERN_ERR "ide-tape: bug: Trying to empty write pipeline, but we are not writing.\n");
|
|
return;
|
|
}
|
|
if (tape->merge_stage_size > tape->stage_size) {
|
|
printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n");
|
|
tape->merge_stage_size = tape->stage_size;
|
|
}
|
|
if (tape->merge_stage_size) {
|
|
blocks = tape->merge_stage_size / tape->tape_block_size;
|
|
if (tape->merge_stage_size % tape->tape_block_size) {
|
|
unsigned int i;
|
|
|
|
blocks++;
|
|
i = tape->tape_block_size - tape->merge_stage_size % tape->tape_block_size;
|
|
bh = tape->bh->b_reqnext;
|
|
while (bh) {
|
|
atomic_set(&bh->b_count, 0);
|
|
bh = bh->b_reqnext;
|
|
}
|
|
bh = tape->bh;
|
|
while (i) {
|
|
if (bh == NULL) {
|
|
|
|
printk(KERN_INFO "ide-tape: bug, bh NULL\n");
|
|
break;
|
|
}
|
|
min = min(i, (unsigned int)(bh->b_size - atomic_read(&bh->b_count)));
|
|
memset(bh->b_data + atomic_read(&bh->b_count), 0, min);
|
|
atomic_add(min, &bh->b_count);
|
|
i -= min;
|
|
bh = bh->b_reqnext;
|
|
}
|
|
}
|
|
(void) idetape_add_chrdev_write_request(drive, blocks);
|
|
tape->merge_stage_size = 0;
|
|
}
|
|
idetape_wait_for_pipeline(drive);
|
|
if (tape->merge_stage != NULL) {
|
|
__idetape_kfree_stage(tape->merge_stage);
|
|
tape->merge_stage = NULL;
|
|
}
|
|
clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
|
|
tape->chrdev_direction = idetape_direction_none;
|
|
|
|
/*
|
|
* On the next backup, perform the feedback loop again.
|
|
* (I don't want to keep sense information between backups,
|
|
* as some systems are constantly on, and the system load
|
|
* can be totally different on the next backup).
|
|
*/
|
|
tape->max_stages = tape->min_pipeline;
|
|
if (tape->first_stage != NULL ||
|
|
tape->next_stage != NULL ||
|
|
tape->last_stage != NULL ||
|
|
tape->nr_stages != 0) {
|
|
printk(KERN_ERR "ide-tape: ide-tape pipeline bug, "
|
|
"first_stage %p, next_stage %p, "
|
|
"last_stage %p, nr_stages %d\n",
|
|
tape->first_stage, tape->next_stage,
|
|
tape->last_stage, tape->nr_stages);
|
|
}
|
|
}
|
|
|
|
static void idetape_restart_speed_control (ide_drive_t *drive)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
|
|
tape->restart_speed_control_req = 0;
|
|
tape->pipeline_head = 0;
|
|
tape->controlled_last_pipeline_head = tape->uncontrolled_last_pipeline_head = 0;
|
|
tape->controlled_previous_pipeline_head = tape->uncontrolled_previous_pipeline_head = 0;
|
|
tape->pipeline_head_speed = tape->controlled_pipeline_head_speed = 5000;
|
|
tape->uncontrolled_pipeline_head_speed = 0;
|
|
tape->controlled_pipeline_head_time = tape->uncontrolled_pipeline_head_time = jiffies;
|
|
tape->controlled_previous_head_time = tape->uncontrolled_previous_head_time = jiffies;
|
|
}
|
|
|
|
static int idetape_initiate_read (ide_drive_t *drive, int max_stages)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
idetape_stage_t *new_stage;
|
|
struct request rq;
|
|
int bytes_read;
|
|
u16 blocks = *(u16 *)&tape->caps[12];
|
|
|
|
/* Initialize read operation */
|
|
if (tape->chrdev_direction != idetape_direction_read) {
|
|
if (tape->chrdev_direction == idetape_direction_write) {
|
|
idetape_empty_write_pipeline(drive);
|
|
idetape_flush_tape_buffers(drive);
|
|
}
|
|
if (tape->merge_stage || tape->merge_stage_size) {
|
|
printk (KERN_ERR "ide-tape: merge_stage_size should be 0 now\n");
|
|
tape->merge_stage_size = 0;
|
|
}
|
|
if ((tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0)) == NULL)
|
|
return -ENOMEM;
|
|
tape->chrdev_direction = idetape_direction_read;
|
|
|
|
/*
|
|
* Issue a read 0 command to ensure that DSC handshake
|
|
* is switched from completion mode to buffer available
|
|
* mode.
|
|
* No point in issuing this if DSC overlap isn't supported,
|
|
* some drives (Seagate STT3401A) will return an error.
|
|
*/
|
|
if (drive->dsc_overlap) {
|
|
bytes_read = idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, 0, tape->merge_stage->bh);
|
|
if (bytes_read < 0) {
|
|
__idetape_kfree_stage(tape->merge_stage);
|
|
tape->merge_stage = NULL;
|
|
tape->chrdev_direction = idetape_direction_none;
|
|
return bytes_read;
|
|
}
|
|
}
|
|
}
|
|
if (tape->restart_speed_control_req)
|
|
idetape_restart_speed_control(drive);
|
|
idetape_init_rq(&rq, REQ_IDETAPE_READ);
|
|
rq.sector = tape->first_frame_position;
|
|
rq.nr_sectors = rq.current_nr_sectors = blocks;
|
|
if (!test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags) &&
|
|
tape->nr_stages < max_stages) {
|
|
new_stage = idetape_kmalloc_stage(tape);
|
|
while (new_stage != NULL) {
|
|
new_stage->rq = rq;
|
|
idetape_add_stage_tail(drive, new_stage);
|
|
if (tape->nr_stages >= max_stages)
|
|
break;
|
|
new_stage = idetape_kmalloc_stage(tape);
|
|
}
|
|
}
|
|
if (!idetape_pipeline_active(tape)) {
|
|
if (tape->nr_pending_stages >= 3 * max_stages / 4) {
|
|
tape->measure_insert_time = 1;
|
|
tape->insert_time = jiffies;
|
|
tape->insert_size = 0;
|
|
tape->insert_speed = 0;
|
|
idetape_insert_pipeline_into_queue(drive);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* idetape_add_chrdev_read_request is called from idetape_chrdev_read
|
|
* to service a character device read request and add read-ahead
|
|
* requests to our pipeline.
|
|
*/
|
|
static int idetape_add_chrdev_read_request (ide_drive_t *drive,int blocks)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
unsigned long flags;
|
|
struct request *rq_ptr;
|
|
int bytes_read;
|
|
|
|
debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks);
|
|
|
|
/*
|
|
* If we are at a filemark, return a read length of 0
|
|
*/
|
|
if (test_bit(IDETAPE_FILEMARK, &tape->flags))
|
|
return 0;
|
|
|
|
/*
|
|
* Wait for the next block to be available at the head
|
|
* of the pipeline
|
|
*/
|
|
idetape_initiate_read(drive, tape->max_stages);
|
|
if (tape->first_stage == NULL) {
|
|
if (test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags))
|
|
return 0;
|
|
return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks, tape->merge_stage->bh);
|
|
}
|
|
idetape_wait_first_stage(drive);
|
|
rq_ptr = &tape->first_stage->rq;
|
|
bytes_read = tape->tape_block_size * (rq_ptr->nr_sectors - rq_ptr->current_nr_sectors);
|
|
rq_ptr->nr_sectors = rq_ptr->current_nr_sectors = 0;
|
|
|
|
|
|
if (rq_ptr->errors == IDETAPE_ERROR_EOD)
|
|
return 0;
|
|
else {
|
|
idetape_switch_buffers(tape, tape->first_stage);
|
|
if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK)
|
|
set_bit(IDETAPE_FILEMARK, &tape->flags);
|
|
spin_lock_irqsave(&tape->spinlock, flags);
|
|
idetape_remove_stage_head(drive);
|
|
spin_unlock_irqrestore(&tape->spinlock, flags);
|
|
tape->pipeline_head++;
|
|
calculate_speeds(drive);
|
|
}
|
|
if (bytes_read > blocks * tape->tape_block_size) {
|
|
printk(KERN_ERR "ide-tape: bug: trying to return more bytes than requested\n");
|
|
bytes_read = blocks * tape->tape_block_size;
|
|
}
|
|
return (bytes_read);
|
|
}
|
|
|
|
static void idetape_pad_zeros (ide_drive_t *drive, int bcount)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
struct idetape_bh *bh;
|
|
int blocks;
|
|
|
|
while (bcount) {
|
|
unsigned int count;
|
|
|
|
bh = tape->merge_stage->bh;
|
|
count = min(tape->stage_size, bcount);
|
|
bcount -= count;
|
|
blocks = count / tape->tape_block_size;
|
|
while (count) {
|
|
atomic_set(&bh->b_count, min(count, (unsigned int)bh->b_size));
|
|
memset(bh->b_data, 0, atomic_read(&bh->b_count));
|
|
count -= atomic_read(&bh->b_count);
|
|
bh = bh->b_reqnext;
|
|
}
|
|
idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks, tape->merge_stage->bh);
|
|
}
|
|
}
|
|
|
|
static int idetape_pipeline_size (ide_drive_t *drive)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
idetape_stage_t *stage;
|
|
struct request *rq;
|
|
int size = 0;
|
|
|
|
idetape_wait_for_pipeline(drive);
|
|
stage = tape->first_stage;
|
|
while (stage != NULL) {
|
|
rq = &stage->rq;
|
|
size += tape->tape_block_size * (rq->nr_sectors-rq->current_nr_sectors);
|
|
if (rq->errors == IDETAPE_ERROR_FILEMARK)
|
|
size += tape->tape_block_size;
|
|
stage = stage->next;
|
|
}
|
|
size += tape->merge_stage_size;
|
|
return size;
|
|
}
|
|
|
|
/*
|
|
* Rewinds the tape to the Beginning Of the current Partition (BOP).
|
|
*
|
|
* We currently support only one partition.
|
|
*/
|
|
static int idetape_rewind_tape (ide_drive_t *drive)
|
|
{
|
|
int retval;
|
|
idetape_pc_t pc;
|
|
idetape_tape_t *tape;
|
|
tape = drive->driver_data;
|
|
|
|
debug_log(DBG_SENSE, "Enter %s\n", __func__);
|
|
|
|
idetape_create_rewind_cmd(drive, &pc);
|
|
retval = idetape_queue_pc_tail(drive, &pc);
|
|
if (retval)
|
|
return retval;
|
|
|
|
idetape_create_read_position_cmd(&pc);
|
|
retval = idetape_queue_pc_tail(drive, &pc);
|
|
if (retval)
|
|
return retval;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Our special ide-tape ioctl's.
|
|
*
|
|
* Currently there aren't any ioctl's.
|
|
* mtio.h compatible commands should be issued to the character device
|
|
* interface.
|
|
*/
|
|
static int idetape_blkdev_ioctl(ide_drive_t *drive, unsigned int cmd, unsigned long arg)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
void __user *argp = (void __user *)arg;
|
|
|
|
struct idetape_config {
|
|
int dsc_rw_frequency;
|
|
int dsc_media_access_frequency;
|
|
int nr_stages;
|
|
} config;
|
|
|
|
debug_log(DBG_PROCS, "Enter %s\n", __func__);
|
|
|
|
switch (cmd) {
|
|
case 0x0340:
|
|
if (copy_from_user(&config, argp, sizeof(config)))
|
|
return -EFAULT;
|
|
tape->best_dsc_rw_frequency = config.dsc_rw_frequency;
|
|
tape->max_stages = config.nr_stages;
|
|
break;
|
|
case 0x0350:
|
|
config.dsc_rw_frequency = (int) tape->best_dsc_rw_frequency;
|
|
config.nr_stages = tape->max_stages;
|
|
if (copy_to_user(argp, &config, sizeof(config)))
|
|
return -EFAULT;
|
|
break;
|
|
default:
|
|
return -EIO;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* idetape_space_over_filemarks is now a bit more complicated than just
|
|
* passing the command to the tape since we may have crossed some
|
|
* filemarks during our pipelined read-ahead mode.
|
|
*
|
|
* As a minor side effect, the pipeline enables us to support MTFSFM when
|
|
* the filemark is in our internal pipeline even if the tape doesn't
|
|
* support spacing over filemarks in the reverse direction.
|
|
*/
|
|
static int idetape_space_over_filemarks (ide_drive_t *drive,short mt_op,int mt_count)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
idetape_pc_t pc;
|
|
unsigned long flags;
|
|
int retval,count=0;
|
|
int sprev = !!(tape->caps[4] & 0x20);
|
|
|
|
if (mt_count == 0)
|
|
return 0;
|
|
if (MTBSF == mt_op || MTBSFM == mt_op) {
|
|
if (!sprev)
|
|
return -EIO;
|
|
mt_count = - mt_count;
|
|
}
|
|
|
|
if (tape->chrdev_direction == idetape_direction_read) {
|
|
/*
|
|
* We have a read-ahead buffer. Scan it for crossed
|
|
* filemarks.
|
|
*/
|
|
tape->merge_stage_size = 0;
|
|
if (test_and_clear_bit(IDETAPE_FILEMARK, &tape->flags))
|
|
++count;
|
|
while (tape->first_stage != NULL) {
|
|
if (count == mt_count) {
|
|
if (mt_op == MTFSFM)
|
|
set_bit(IDETAPE_FILEMARK, &tape->flags);
|
|
return 0;
|
|
}
|
|
spin_lock_irqsave(&tape->spinlock, flags);
|
|
if (tape->first_stage == tape->active_stage) {
|
|
/*
|
|
* We have reached the active stage in the read pipeline.
|
|
* There is no point in allowing the drive to continue
|
|
* reading any farther, so we stop the pipeline.
|
|
*
|
|
* This section should be moved to a separate subroutine,
|
|
* because a similar function is performed in
|
|
* __idetape_discard_read_pipeline(), for example.
|
|
*/
|
|
tape->next_stage = NULL;
|
|
spin_unlock_irqrestore(&tape->spinlock, flags);
|
|
idetape_wait_first_stage(drive);
|
|
tape->next_stage = tape->first_stage->next;
|
|
} else
|
|
spin_unlock_irqrestore(&tape->spinlock, flags);
|
|
if (tape->first_stage->rq.errors == IDETAPE_ERROR_FILEMARK)
|
|
++count;
|
|
idetape_remove_stage_head(drive);
|
|
}
|
|
idetape_discard_read_pipeline(drive, 0);
|
|
}
|
|
|
|
/*
|
|
* The filemark was not found in our internal pipeline.
|
|
* Now we can issue the space command.
|
|
*/
|
|
switch (mt_op) {
|
|
case MTFSF:
|
|
case MTBSF:
|
|
idetape_create_space_cmd(&pc,mt_count-count,IDETAPE_SPACE_OVER_FILEMARK);
|
|
return (idetape_queue_pc_tail(drive, &pc));
|
|
case MTFSFM:
|
|
case MTBSFM:
|
|
if (!sprev)
|
|
return (-EIO);
|
|
retval = idetape_space_over_filemarks(drive, MTFSF, mt_count-count);
|
|
if (retval) return (retval);
|
|
count = (MTBSFM == mt_op ? 1 : -1);
|
|
return (idetape_space_over_filemarks(drive, MTFSF, count));
|
|
default:
|
|
printk(KERN_ERR "ide-tape: MTIO operation %d not supported\n",mt_op);
|
|
return (-EIO);
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Our character device read / write functions.
|
|
*
|
|
* The tape is optimized to maximize throughput when it is transferring
|
|
* an integral number of the "continuous transfer limit", which is
|
|
* a parameter of the specific tape (26 KB on my particular tape).
|
|
* (32 kB for Onstream)
|
|
*
|
|
* As of version 1.3 of the driver, the character device provides an
|
|
* abstract continuous view of the media - any mix of block sizes (even 1
|
|
* byte) on the same backup/restore procedure is supported. The driver
|
|
* will internally convert the requests to the recommended transfer unit,
|
|
* so that an unmatch between the user's block size to the recommended
|
|
* size will only result in a (slightly) increased driver overhead, but
|
|
* will no longer hit performance.
|
|
* This is not applicable to Onstream.
|
|
*/
|
|
static ssize_t idetape_chrdev_read (struct file *file, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct ide_tape_obj *tape = ide_tape_f(file);
|
|
ide_drive_t *drive = tape->drive;
|
|
ssize_t bytes_read,temp, actually_read = 0, rc;
|
|
ssize_t ret = 0;
|
|
u16 ctl = *(u16 *)&tape->caps[12];
|
|
|
|
debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
|
|
|
|
if (tape->chrdev_direction != idetape_direction_read) {
|
|
if (test_bit(IDETAPE_DETECT_BS, &tape->flags))
|
|
if (count > tape->tape_block_size &&
|
|
(count % tape->tape_block_size) == 0)
|
|
tape->user_bs_factor = count / tape->tape_block_size;
|
|
}
|
|
if ((rc = idetape_initiate_read(drive, tape->max_stages)) < 0)
|
|
return rc;
|
|
if (count == 0)
|
|
return (0);
|
|
if (tape->merge_stage_size) {
|
|
actually_read = min((unsigned int)(tape->merge_stage_size), (unsigned int)count);
|
|
if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage, actually_read))
|
|
ret = -EFAULT;
|
|
buf += actually_read;
|
|
tape->merge_stage_size -= actually_read;
|
|
count -= actually_read;
|
|
}
|
|
while (count >= tape->stage_size) {
|
|
bytes_read = idetape_add_chrdev_read_request(drive, ctl);
|
|
if (bytes_read <= 0)
|
|
goto finish;
|
|
if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage, bytes_read))
|
|
ret = -EFAULT;
|
|
buf += bytes_read;
|
|
count -= bytes_read;
|
|
actually_read += bytes_read;
|
|
}
|
|
if (count) {
|
|
bytes_read = idetape_add_chrdev_read_request(drive, ctl);
|
|
if (bytes_read <= 0)
|
|
goto finish;
|
|
temp = min((unsigned long)count, (unsigned long)bytes_read);
|
|
if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage, temp))
|
|
ret = -EFAULT;
|
|
actually_read += temp;
|
|
tape->merge_stage_size = bytes_read-temp;
|
|
}
|
|
finish:
|
|
if (!actually_read && test_bit(IDETAPE_FILEMARK, &tape->flags)) {
|
|
debug_log(DBG_SENSE, "%s: spacing over filemark\n", tape->name);
|
|
|
|
idetape_space_over_filemarks(drive, MTFSF, 1);
|
|
return 0;
|
|
}
|
|
|
|
return (ret) ? ret : actually_read;
|
|
}
|
|
|
|
static ssize_t idetape_chrdev_write (struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct ide_tape_obj *tape = ide_tape_f(file);
|
|
ide_drive_t *drive = tape->drive;
|
|
ssize_t actually_written = 0;
|
|
ssize_t ret = 0;
|
|
u16 ctl = *(u16 *)&tape->caps[12];
|
|
|
|
/* The drive is write protected. */
|
|
if (tape->write_prot)
|
|
return -EACCES;
|
|
|
|
debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count);
|
|
|
|
/* Initialize write operation */
|
|
if (tape->chrdev_direction != idetape_direction_write) {
|
|
if (tape->chrdev_direction == idetape_direction_read)
|
|
idetape_discard_read_pipeline(drive, 1);
|
|
if (tape->merge_stage || tape->merge_stage_size) {
|
|
printk(KERN_ERR "ide-tape: merge_stage_size "
|
|
"should be 0 now\n");
|
|
tape->merge_stage_size = 0;
|
|
}
|
|
if ((tape->merge_stage = __idetape_kmalloc_stage(tape, 0, 0)) == NULL)
|
|
return -ENOMEM;
|
|
tape->chrdev_direction = idetape_direction_write;
|
|
idetape_init_merge_stage(tape);
|
|
|
|
/*
|
|
* Issue a write 0 command to ensure that DSC handshake
|
|
* is switched from completion mode to buffer available
|
|
* mode.
|
|
* No point in issuing this if DSC overlap isn't supported,
|
|
* some drives (Seagate STT3401A) will return an error.
|
|
*/
|
|
if (drive->dsc_overlap) {
|
|
ssize_t retval = idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, 0, tape->merge_stage->bh);
|
|
if (retval < 0) {
|
|
__idetape_kfree_stage(tape->merge_stage);
|
|
tape->merge_stage = NULL;
|
|
tape->chrdev_direction = idetape_direction_none;
|
|
return retval;
|
|
}
|
|
}
|
|
}
|
|
if (count == 0)
|
|
return (0);
|
|
if (tape->restart_speed_control_req)
|
|
idetape_restart_speed_control(drive);
|
|
if (tape->merge_stage_size) {
|
|
if (tape->merge_stage_size >= tape->stage_size) {
|
|
printk(KERN_ERR "ide-tape: bug: merge buffer too big\n");
|
|
tape->merge_stage_size = 0;
|
|
}
|
|
actually_written = min((unsigned int)(tape->stage_size - tape->merge_stage_size), (unsigned int)count);
|
|
if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf, actually_written))
|
|
ret = -EFAULT;
|
|
buf += actually_written;
|
|
tape->merge_stage_size += actually_written;
|
|
count -= actually_written;
|
|
|
|
if (tape->merge_stage_size == tape->stage_size) {
|
|
ssize_t retval;
|
|
tape->merge_stage_size = 0;
|
|
retval = idetape_add_chrdev_write_request(drive, ctl);
|
|
if (retval <= 0)
|
|
return (retval);
|
|
}
|
|
}
|
|
while (count >= tape->stage_size) {
|
|
ssize_t retval;
|
|
if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf, tape->stage_size))
|
|
ret = -EFAULT;
|
|
buf += tape->stage_size;
|
|
count -= tape->stage_size;
|
|
retval = idetape_add_chrdev_write_request(drive, ctl);
|
|
actually_written += tape->stage_size;
|
|
if (retval <= 0)
|
|
return (retval);
|
|
}
|
|
if (count) {
|
|
actually_written += count;
|
|
if (idetape_copy_stage_from_user(tape, tape->merge_stage, buf, count))
|
|
ret = -EFAULT;
|
|
tape->merge_stage_size += count;
|
|
}
|
|
return (ret) ? ret : actually_written;
|
|
}
|
|
|
|
static int idetape_write_filemark (ide_drive_t *drive)
|
|
{
|
|
idetape_pc_t pc;
|
|
|
|
/* Write a filemark */
|
|
idetape_create_write_filemark_cmd(drive, &pc, 1);
|
|
if (idetape_queue_pc_tail(drive, &pc)) {
|
|
printk(KERN_ERR "ide-tape: Couldn't write a filemark\n");
|
|
return -EIO;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Called from idetape_chrdev_ioctl when the general mtio MTIOCTOP ioctl is
|
|
* requested.
|
|
*
|
|
* Note: MTBSF and MTBSFM are not supported when the tape doesn't support
|
|
* spacing over filemarks in the reverse direction. In this case, MTFSFM is also
|
|
* usually not supported (it is supported in the rare case in which we crossed
|
|
* the filemark during our read-ahead pipelined operation mode).
|
|
*
|
|
* The following commands are currently not supported:
|
|
*
|
|
* MTFSS, MTBSS, MTWSM, MTSETDENSITY, MTSETDRVBUFFER, MT_ST_BOOLEANS,
|
|
* MT_ST_WRITE_THRESHOLD.
|
|
*/
|
|
static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
idetape_pc_t pc;
|
|
int i,retval;
|
|
|
|
debug_log(DBG_ERR, "Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n",
|
|
mt_op, mt_count);
|
|
/*
|
|
* Commands which need our pipelined read-ahead stages.
|
|
*/
|
|
switch (mt_op) {
|
|
case MTFSF:
|
|
case MTFSFM:
|
|
case MTBSF:
|
|
case MTBSFM:
|
|
if (!mt_count)
|
|
return (0);
|
|
return (idetape_space_over_filemarks(drive,mt_op,mt_count));
|
|
default:
|
|
break;
|
|
}
|
|
switch (mt_op) {
|
|
case MTWEOF:
|
|
if (tape->write_prot)
|
|
return -EACCES;
|
|
idetape_discard_read_pipeline(drive, 1);
|
|
for (i = 0; i < mt_count; i++) {
|
|
retval = idetape_write_filemark(drive);
|
|
if (retval)
|
|
return retval;
|
|
}
|
|
return (0);
|
|
case MTREW:
|
|
idetape_discard_read_pipeline(drive, 0);
|
|
if (idetape_rewind_tape(drive))
|
|
return -EIO;
|
|
return 0;
|
|
case MTLOAD:
|
|
idetape_discard_read_pipeline(drive, 0);
|
|
idetape_create_load_unload_cmd(drive, &pc, IDETAPE_LU_LOAD_MASK);
|
|
return (idetape_queue_pc_tail(drive, &pc));
|
|
case MTUNLOAD:
|
|
case MTOFFL:
|
|
/*
|
|
* If door is locked, attempt to unlock before
|
|
* attempting to eject.
|
|
*/
|
|
if (tape->door_locked) {
|
|
if (idetape_create_prevent_cmd(drive, &pc, 0))
|
|
if (!idetape_queue_pc_tail(drive, &pc))
|
|
tape->door_locked = DOOR_UNLOCKED;
|
|
}
|
|
idetape_discard_read_pipeline(drive, 0);
|
|
idetape_create_load_unload_cmd(drive, &pc,!IDETAPE_LU_LOAD_MASK);
|
|
retval = idetape_queue_pc_tail(drive, &pc);
|
|
if (!retval)
|
|
clear_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags);
|
|
return retval;
|
|
case MTNOP:
|
|
idetape_discard_read_pipeline(drive, 0);
|
|
return (idetape_flush_tape_buffers(drive));
|
|
case MTRETEN:
|
|
idetape_discard_read_pipeline(drive, 0);
|
|
idetape_create_load_unload_cmd(drive, &pc,IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK);
|
|
return (idetape_queue_pc_tail(drive, &pc));
|
|
case MTEOM:
|
|
idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD);
|
|
return (idetape_queue_pc_tail(drive, &pc));
|
|
case MTERASE:
|
|
(void) idetape_rewind_tape(drive);
|
|
idetape_create_erase_cmd(&pc);
|
|
return (idetape_queue_pc_tail(drive, &pc));
|
|
case MTSETBLK:
|
|
if (mt_count) {
|
|
if (mt_count < tape->tape_block_size || mt_count % tape->tape_block_size)
|
|
return -EIO;
|
|
tape->user_bs_factor = mt_count / tape->tape_block_size;
|
|
clear_bit(IDETAPE_DETECT_BS, &tape->flags);
|
|
} else
|
|
set_bit(IDETAPE_DETECT_BS, &tape->flags);
|
|
return 0;
|
|
case MTSEEK:
|
|
idetape_discard_read_pipeline(drive, 0);
|
|
return idetape_position_tape(drive, mt_count * tape->user_bs_factor, tape->partition, 0);
|
|
case MTSETPART:
|
|
idetape_discard_read_pipeline(drive, 0);
|
|
return (idetape_position_tape(drive, 0, mt_count, 0));
|
|
case MTFSR:
|
|
case MTBSR:
|
|
case MTLOCK:
|
|
if (!idetape_create_prevent_cmd(drive, &pc, 1))
|
|
return 0;
|
|
retval = idetape_queue_pc_tail(drive, &pc);
|
|
if (retval) return retval;
|
|
tape->door_locked = DOOR_EXPLICITLY_LOCKED;
|
|
return 0;
|
|
case MTUNLOCK:
|
|
if (!idetape_create_prevent_cmd(drive, &pc, 0))
|
|
return 0;
|
|
retval = idetape_queue_pc_tail(drive, &pc);
|
|
if (retval) return retval;
|
|
tape->door_locked = DOOR_UNLOCKED;
|
|
return 0;
|
|
default:
|
|
printk(KERN_ERR "ide-tape: MTIO operation %d not "
|
|
"supported\n", mt_op);
|
|
return (-EIO);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Our character device ioctls. General mtio.h magnetic io commands are
|
|
* supported here, and not in the corresponding block interface. Our own
|
|
* ide-tape ioctls are supported on both interfaces.
|
|
*/
|
|
static int idetape_chrdev_ioctl(struct inode *inode, struct file *file,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct ide_tape_obj *tape = ide_tape_f(file);
|
|
ide_drive_t *drive = tape->drive;
|
|
struct mtop mtop;
|
|
struct mtget mtget;
|
|
struct mtpos mtpos;
|
|
int block_offset = 0, position = tape->first_frame_position;
|
|
void __user *argp = (void __user *)arg;
|
|
|
|
debug_log(DBG_CHRDEV, "Enter %s, cmd=%u\n", __func__, cmd);
|
|
|
|
tape->restart_speed_control_req = 1;
|
|
if (tape->chrdev_direction == idetape_direction_write) {
|
|
idetape_empty_write_pipeline(drive);
|
|
idetape_flush_tape_buffers(drive);
|
|
}
|
|
if (cmd == MTIOCGET || cmd == MTIOCPOS) {
|
|
block_offset = idetape_pipeline_size(drive) / (tape->tape_block_size * tape->user_bs_factor);
|
|
if ((position = idetape_read_position(drive)) < 0)
|
|
return -EIO;
|
|
}
|
|
switch (cmd) {
|
|
case MTIOCTOP:
|
|
if (copy_from_user(&mtop, argp, sizeof (struct mtop)))
|
|
return -EFAULT;
|
|
return (idetape_mtioctop(drive,mtop.mt_op,mtop.mt_count));
|
|
case MTIOCGET:
|
|
memset(&mtget, 0, sizeof (struct mtget));
|
|
mtget.mt_type = MT_ISSCSI2;
|
|
mtget.mt_blkno = position / tape->user_bs_factor - block_offset;
|
|
mtget.mt_dsreg = ((tape->tape_block_size * tape->user_bs_factor) << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK;
|
|
if (tape->drv_write_prot) {
|
|
mtget.mt_gstat |= GMT_WR_PROT(0xffffffff);
|
|
}
|
|
if (copy_to_user(argp, &mtget, sizeof(struct mtget)))
|
|
return -EFAULT;
|
|
return 0;
|
|
case MTIOCPOS:
|
|
mtpos.mt_blkno = position / tape->user_bs_factor - block_offset;
|
|
if (copy_to_user(argp, &mtpos, sizeof(struct mtpos)))
|
|
return -EFAULT;
|
|
return 0;
|
|
default:
|
|
if (tape->chrdev_direction == idetape_direction_read)
|
|
idetape_discard_read_pipeline(drive, 1);
|
|
return idetape_blkdev_ioctl(drive, cmd, arg);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Do a mode sense page 0 with block descriptor and if it succeeds set the tape
|
|
* block size with the reported value.
|
|
*/
|
|
static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
idetape_pc_t pc;
|
|
|
|
idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR);
|
|
if (idetape_queue_pc_tail(drive, &pc)) {
|
|
printk(KERN_ERR "ide-tape: Can't get block descriptor\n");
|
|
if (tape->tape_block_size == 0) {
|
|
printk(KERN_WARNING "ide-tape: Cannot deal with zero "
|
|
"block size, assuming 32k\n");
|
|
tape->tape_block_size = 32768;
|
|
}
|
|
return;
|
|
}
|
|
tape->tape_block_size = (pc.buffer[4 + 5] << 16) +
|
|
(pc.buffer[4 + 6] << 8) +
|
|
pc.buffer[4 + 7];
|
|
tape->drv_write_prot = (pc.buffer[2] & 0x80) >> 7;
|
|
}
|
|
|
|
/*
|
|
* Our character device open function.
|
|
*/
|
|
static int idetape_chrdev_open (struct inode *inode, struct file *filp)
|
|
{
|
|
unsigned int minor = iminor(inode), i = minor & ~0xc0;
|
|
ide_drive_t *drive;
|
|
idetape_tape_t *tape;
|
|
idetape_pc_t pc;
|
|
int retval;
|
|
|
|
if (i >= MAX_HWIFS * MAX_DRIVES)
|
|
return -ENXIO;
|
|
|
|
tape = ide_tape_chrdev_get(i);
|
|
if (!tape)
|
|
return -ENXIO;
|
|
|
|
debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
|
|
|
|
/*
|
|
* We really want to do nonseekable_open(inode, filp); here, but some
|
|
* versions of tar incorrectly call lseek on tapes and bail out if that
|
|
* fails. So we disallow pread() and pwrite(), but permit lseeks.
|
|
*/
|
|
filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE);
|
|
|
|
drive = tape->drive;
|
|
|
|
filp->private_data = tape;
|
|
|
|
if (test_and_set_bit(IDETAPE_BUSY, &tape->flags)) {
|
|
retval = -EBUSY;
|
|
goto out_put_tape;
|
|
}
|
|
|
|
retval = idetape_wait_ready(drive, 60 * HZ);
|
|
if (retval) {
|
|
clear_bit(IDETAPE_BUSY, &tape->flags);
|
|
printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name);
|
|
goto out_put_tape;
|
|
}
|
|
|
|
idetape_read_position(drive);
|
|
if (!test_bit(IDETAPE_ADDRESS_VALID, &tape->flags))
|
|
(void)idetape_rewind_tape(drive);
|
|
|
|
if (tape->chrdev_direction != idetape_direction_read)
|
|
clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags);
|
|
|
|
/* Read block size and write protect status from drive. */
|
|
ide_tape_get_bsize_from_bdesc(drive);
|
|
|
|
/* Set write protect flag if device is opened as read-only. */
|
|
if ((filp->f_flags & O_ACCMODE) == O_RDONLY)
|
|
tape->write_prot = 1;
|
|
else
|
|
tape->write_prot = tape->drv_write_prot;
|
|
|
|
/* Make sure drive isn't write protected if user wants to write. */
|
|
if (tape->write_prot) {
|
|
if ((filp->f_flags & O_ACCMODE) == O_WRONLY ||
|
|
(filp->f_flags & O_ACCMODE) == O_RDWR) {
|
|
clear_bit(IDETAPE_BUSY, &tape->flags);
|
|
retval = -EROFS;
|
|
goto out_put_tape;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Lock the tape drive door so user can't eject.
|
|
*/
|
|
if (tape->chrdev_direction == idetape_direction_none) {
|
|
if (idetape_create_prevent_cmd(drive, &pc, 1)) {
|
|
if (!idetape_queue_pc_tail(drive, &pc)) {
|
|
if (tape->door_locked != DOOR_EXPLICITLY_LOCKED)
|
|
tape->door_locked = DOOR_LOCKED;
|
|
}
|
|
}
|
|
}
|
|
idetape_restart_speed_control(drive);
|
|
tape->restart_speed_control_req = 0;
|
|
return 0;
|
|
|
|
out_put_tape:
|
|
ide_tape_put(tape);
|
|
return retval;
|
|
}
|
|
|
|
static void idetape_write_release (ide_drive_t *drive, unsigned int minor)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
|
|
idetape_empty_write_pipeline(drive);
|
|
tape->merge_stage = __idetape_kmalloc_stage(tape, 1, 0);
|
|
if (tape->merge_stage != NULL) {
|
|
idetape_pad_zeros(drive, tape->tape_block_size * (tape->user_bs_factor - 1));
|
|
__idetape_kfree_stage(tape->merge_stage);
|
|
tape->merge_stage = NULL;
|
|
}
|
|
idetape_write_filemark(drive);
|
|
idetape_flush_tape_buffers(drive);
|
|
idetape_flush_tape_buffers(drive);
|
|
}
|
|
|
|
/*
|
|
* Our character device release function.
|
|
*/
|
|
static int idetape_chrdev_release (struct inode *inode, struct file *filp)
|
|
{
|
|
struct ide_tape_obj *tape = ide_tape_f(filp);
|
|
ide_drive_t *drive = tape->drive;
|
|
idetape_pc_t pc;
|
|
unsigned int minor = iminor(inode);
|
|
|
|
lock_kernel();
|
|
tape = drive->driver_data;
|
|
|
|
debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
|
|
|
|
if (tape->chrdev_direction == idetape_direction_write)
|
|
idetape_write_release(drive, minor);
|
|
if (tape->chrdev_direction == idetape_direction_read) {
|
|
if (minor < 128)
|
|
idetape_discard_read_pipeline(drive, 1);
|
|
else
|
|
idetape_wait_for_pipeline(drive);
|
|
}
|
|
if (tape->cache_stage != NULL) {
|
|
__idetape_kfree_stage(tape->cache_stage);
|
|
tape->cache_stage = NULL;
|
|
}
|
|
if (minor < 128 && test_bit(IDETAPE_MEDIUM_PRESENT, &tape->flags))
|
|
(void) idetape_rewind_tape(drive);
|
|
if (tape->chrdev_direction == idetape_direction_none) {
|
|
if (tape->door_locked == DOOR_LOCKED) {
|
|
if (idetape_create_prevent_cmd(drive, &pc, 0)) {
|
|
if (!idetape_queue_pc_tail(drive, &pc))
|
|
tape->door_locked = DOOR_UNLOCKED;
|
|
}
|
|
}
|
|
}
|
|
clear_bit(IDETAPE_BUSY, &tape->flags);
|
|
ide_tape_put(tape);
|
|
unlock_kernel();
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* idetape_identify_device is called to check the contents of the
|
|
* ATAPI IDENTIFY command results. We return:
|
|
*
|
|
* 1 If the tape can be supported by us, based on the information
|
|
* we have so far.
|
|
*
|
|
* 0 If this tape driver is not currently supported by us.
|
|
*/
|
|
static int idetape_identify_device (ide_drive_t *drive)
|
|
{
|
|
struct idetape_id_gcw gcw;
|
|
struct hd_driveid *id = drive->id;
|
|
|
|
if (drive->id_read == 0)
|
|
return 1;
|
|
|
|
*((unsigned short *) &gcw) = id->config;
|
|
|
|
/* Check that we can support this device */
|
|
|
|
if (gcw.protocol != 2)
|
|
printk(KERN_ERR "ide-tape: Protocol (0x%02x) is not ATAPI\n",
|
|
gcw.protocol);
|
|
else if (gcw.device_type != 1)
|
|
printk(KERN_ERR "ide-tape: Device type (0x%02x) is not set "
|
|
"to tape\n", gcw.device_type);
|
|
else if (!gcw.removable)
|
|
printk(KERN_ERR "ide-tape: The removable flag is not set\n");
|
|
else if (gcw.packet_size != 0) {
|
|
printk(KERN_ERR "ide-tape: Packet size (0x%02x) is not 12 "
|
|
"bytes long\n", gcw.packet_size);
|
|
} else
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static void idetape_get_inquiry_results(ide_drive_t *drive)
|
|
{
|
|
char *r;
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
idetape_pc_t pc;
|
|
|
|
idetape_create_inquiry_cmd(&pc);
|
|
if (idetape_queue_pc_tail(drive, &pc)) {
|
|
printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n",
|
|
tape->name);
|
|
return;
|
|
}
|
|
memcpy(tape->vendor_id, &pc.buffer[8], 8);
|
|
memcpy(tape->product_id, &pc.buffer[16], 16);
|
|
memcpy(tape->firmware_revision, &pc.buffer[32], 4);
|
|
|
|
ide_fixstring(tape->vendor_id, 10, 0);
|
|
ide_fixstring(tape->product_id, 18, 0);
|
|
ide_fixstring(tape->firmware_revision, 6, 0);
|
|
r = tape->firmware_revision;
|
|
if (*(r + 1) == '.')
|
|
tape->firmware_revision_num = (*r - '0') * 100 +
|
|
(*(r + 2) - '0') * 10 + *(r + 3) - '0';
|
|
printk(KERN_INFO "ide-tape: %s <-> %s: %s %s rev %s\n",
|
|
drive->name, tape->name, tape->vendor_id,
|
|
tape->product_id, tape->firmware_revision);
|
|
}
|
|
|
|
/*
|
|
* Ask the tape about its various parameters. In particular, we will adjust our
|
|
* data transfer buffer size to the recommended value as returned by the tape.
|
|
*/
|
|
static void idetape_get_mode_sense_results (ide_drive_t *drive)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
idetape_pc_t pc;
|
|
u8 *caps;
|
|
u8 speed, max_speed;
|
|
|
|
idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE);
|
|
if (idetape_queue_pc_tail(drive, &pc)) {
|
|
printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming"
|
|
" some default values\n");
|
|
tape->tape_block_size = 512;
|
|
put_unaligned(52, (u16 *)&tape->caps[12]);
|
|
put_unaligned(540, (u16 *)&tape->caps[14]);
|
|
put_unaligned(6*52, (u16 *)&tape->caps[16]);
|
|
return;
|
|
}
|
|
caps = pc.buffer + 4 + pc.buffer[3];
|
|
|
|
/* convert to host order and save for later use */
|
|
speed = be16_to_cpu(*(u16 *)&caps[14]);
|
|
max_speed = be16_to_cpu(*(u16 *)&caps[8]);
|
|
|
|
put_unaligned(max_speed, (u16 *)&caps[8]);
|
|
put_unaligned(be16_to_cpu(*(u16 *)&caps[12]), (u16 *)&caps[12]);
|
|
put_unaligned(speed, (u16 *)&caps[14]);
|
|
put_unaligned(be16_to_cpu(*(u16 *)&caps[16]), (u16 *)&caps[16]);
|
|
|
|
if (!speed) {
|
|
printk(KERN_INFO "ide-tape: %s: invalid tape speed "
|
|
"(assuming 650KB/sec)\n", drive->name);
|
|
put_unaligned(650, (u16 *)&caps[14]);
|
|
}
|
|
if (!max_speed) {
|
|
printk(KERN_INFO "ide-tape: %s: invalid max_speed "
|
|
"(assuming 650KB/sec)\n", drive->name);
|
|
put_unaligned(650, (u16 *)&caps[8]);
|
|
}
|
|
|
|
memcpy(&tape->caps, caps, 20);
|
|
if (caps[7] & 0x02)
|
|
tape->tape_block_size = 512;
|
|
else if (caps[7] & 0x04)
|
|
tape->tape_block_size = 1024;
|
|
}
|
|
|
|
#ifdef CONFIG_IDE_PROC_FS
|
|
static void idetape_add_settings (ide_drive_t *drive)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
|
|
/*
|
|
* drive setting name read/write data type min max mul_factor div_factor data pointer set function
|
|
*/
|
|
ide_add_setting(drive, "buffer", SETTING_READ, TYPE_SHORT, 0, 0xffff,
|
|
1, 2, (u16 *)&tape->caps[16], NULL);
|
|
ide_add_setting(drive, "pipeline_min", SETTING_RW, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->min_pipeline, NULL);
|
|
ide_add_setting(drive, "pipeline", SETTING_RW, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->max_stages, NULL);
|
|
ide_add_setting(drive, "pipeline_max", SETTING_RW, TYPE_INT, 1, 0xffff, tape->stage_size / 1024, 1, &tape->max_pipeline, NULL);
|
|
ide_add_setting(drive, "pipeline_used", SETTING_READ, TYPE_INT, 0, 0xffff, tape->stage_size / 1024, 1, &tape->nr_stages, NULL);
|
|
ide_add_setting(drive, "pipeline_pending", SETTING_READ, TYPE_INT, 0, 0xffff, tape->stage_size / 1024, 1, &tape->nr_pending_stages, NULL);
|
|
ide_add_setting(drive, "speed", SETTING_READ, TYPE_SHORT, 0, 0xffff,
|
|
1, 1, (u16 *)&tape->caps[14], NULL);
|
|
ide_add_setting(drive, "stage", SETTING_READ, TYPE_INT, 0, 0xffff, 1, 1024, &tape->stage_size, NULL);
|
|
ide_add_setting(drive, "tdsc", SETTING_RW, TYPE_INT, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX, 1000, HZ, &tape->best_dsc_rw_frequency, NULL);
|
|
ide_add_setting(drive, "dsc_overlap", SETTING_RW, TYPE_BYTE, 0, 1, 1, 1, &drive->dsc_overlap, NULL);
|
|
ide_add_setting(drive, "pipeline_head_speed_c",SETTING_READ, TYPE_INT, 0, 0xffff, 1, 1, &tape->controlled_pipeline_head_speed, NULL);
|
|
ide_add_setting(drive, "pipeline_head_speed_u",SETTING_READ, TYPE_INT, 0, 0xffff, 1, 1, &tape->uncontrolled_pipeline_head_speed,NULL);
|
|
ide_add_setting(drive, "avg_speed", SETTING_READ, TYPE_INT, 0, 0xffff, 1, 1, &tape->avg_speed, NULL);
|
|
ide_add_setting(drive, "debug_mask", SETTING_RW, TYPE_INT, 0, 0xffff, 1,
|
|
1, &tape->debug_mask, NULL);
|
|
}
|
|
#else
|
|
static inline void idetape_add_settings(ide_drive_t *drive) { ; }
|
|
#endif
|
|
|
|
/*
|
|
* ide_setup is called to:
|
|
*
|
|
* 1. Initialize our various state variables.
|
|
* 2. Ask the tape for its capabilities.
|
|
* 3. Allocate a buffer which will be used for data
|
|
* transfer. The buffer size is chosen based on
|
|
* the recommendation which we received in step (2).
|
|
*
|
|
* Note that at this point ide.c already assigned us an irq, so that
|
|
* we can queue requests here and wait for their completion.
|
|
*/
|
|
static void idetape_setup (ide_drive_t *drive, idetape_tape_t *tape, int minor)
|
|
{
|
|
unsigned long t1, tmid, tn, t;
|
|
int speed;
|
|
struct idetape_id_gcw gcw;
|
|
int stage_size;
|
|
struct sysinfo si;
|
|
u16 *ctl = (u16 *)&tape->caps[12];
|
|
|
|
spin_lock_init(&tape->spinlock);
|
|
drive->dsc_overlap = 1;
|
|
if (drive->hwif->host_flags & IDE_HFLAG_NO_DSC) {
|
|
printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n",
|
|
tape->name);
|
|
drive->dsc_overlap = 0;
|
|
}
|
|
/* Seagate Travan drives do not support DSC overlap. */
|
|
if (strstr(drive->id->model, "Seagate STT3401"))
|
|
drive->dsc_overlap = 0;
|
|
tape->minor = minor;
|
|
tape->name[0] = 'h';
|
|
tape->name[1] = 't';
|
|
tape->name[2] = '0' + minor;
|
|
tape->chrdev_direction = idetape_direction_none;
|
|
tape->pc = tape->pc_stack;
|
|
tape->max_insert_speed = 10000;
|
|
tape->speed_control = 1;
|
|
*((unsigned short *) &gcw) = drive->id->config;
|
|
if (gcw.drq_type == 1)
|
|
set_bit(IDETAPE_DRQ_INTERRUPT, &tape->flags);
|
|
|
|
tape->min_pipeline = tape->max_pipeline = tape->max_stages = 10;
|
|
|
|
idetape_get_inquiry_results(drive);
|
|
idetape_get_mode_sense_results(drive);
|
|
ide_tape_get_bsize_from_bdesc(drive);
|
|
tape->user_bs_factor = 1;
|
|
tape->stage_size = *ctl * tape->tape_block_size;
|
|
while (tape->stage_size > 0xffff) {
|
|
printk(KERN_NOTICE "ide-tape: decreasing stage size\n");
|
|
*ctl /= 2;
|
|
tape->stage_size = *ctl * tape->tape_block_size;
|
|
}
|
|
stage_size = tape->stage_size;
|
|
tape->pages_per_stage = stage_size / PAGE_SIZE;
|
|
if (stage_size % PAGE_SIZE) {
|
|
tape->pages_per_stage++;
|
|
tape->excess_bh_size = PAGE_SIZE - stage_size % PAGE_SIZE;
|
|
}
|
|
|
|
/* Select the "best" DSC read/write polling freq and pipeline size. */
|
|
speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]);
|
|
|
|
tape->max_stages = speed * 1000 * 10 / tape->stage_size;
|
|
|
|
/*
|
|
* Limit memory use for pipeline to 10% of physical memory
|
|
*/
|
|
si_meminfo(&si);
|
|
if (tape->max_stages * tape->stage_size > si.totalram * si.mem_unit / 10)
|
|
tape->max_stages = si.totalram * si.mem_unit / (10 * tape->stage_size);
|
|
tape->max_stages = min(tape->max_stages, IDETAPE_MAX_PIPELINE_STAGES);
|
|
tape->min_pipeline = min(tape->max_stages, IDETAPE_MIN_PIPELINE_STAGES);
|
|
tape->max_pipeline = min(tape->max_stages * 2, IDETAPE_MAX_PIPELINE_STAGES);
|
|
if (tape->max_stages == 0)
|
|
tape->max_stages = tape->min_pipeline = tape->max_pipeline = 1;
|
|
|
|
t1 = (tape->stage_size * HZ) / (speed * 1000);
|
|
tmid = (*(u16 *)&tape->caps[16] * 32 * HZ) / (speed * 125);
|
|
tn = (IDETAPE_FIFO_THRESHOLD * tape->stage_size * HZ) / (speed * 1000);
|
|
|
|
if (tape->max_stages)
|
|
t = tn;
|
|
else
|
|
t = t1;
|
|
|
|
/*
|
|
* Ensure that the number we got makes sense; limit
|
|
* it within IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX.
|
|
*/
|
|
tape->best_dsc_rw_frequency = max_t(unsigned long, min_t(unsigned long, t, IDETAPE_DSC_RW_MAX), IDETAPE_DSC_RW_MIN);
|
|
printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
|
|
"%dkB pipeline, %lums tDSC%s\n",
|
|
drive->name, tape->name, *(u16 *)&tape->caps[14],
|
|
(*(u16 *)&tape->caps[16] * 512) / tape->stage_size,
|
|
tape->stage_size / 1024,
|
|
tape->max_stages * tape->stage_size / 1024,
|
|
tape->best_dsc_rw_frequency * 1000 / HZ,
|
|
drive->using_dma ? ", DMA":"");
|
|
|
|
idetape_add_settings(drive);
|
|
}
|
|
|
|
static void ide_tape_remove(ide_drive_t *drive)
|
|
{
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
|
|
ide_proc_unregister_driver(drive, tape->driver);
|
|
|
|
ide_unregister_region(tape->disk);
|
|
|
|
ide_tape_put(tape);
|
|
}
|
|
|
|
static void ide_tape_release(struct kref *kref)
|
|
{
|
|
struct ide_tape_obj *tape = to_ide_tape(kref);
|
|
ide_drive_t *drive = tape->drive;
|
|
struct gendisk *g = tape->disk;
|
|
|
|
BUG_ON(tape->first_stage != NULL || tape->merge_stage_size);
|
|
|
|
drive->dsc_overlap = 0;
|
|
drive->driver_data = NULL;
|
|
device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor));
|
|
device_destroy(idetape_sysfs_class, MKDEV(IDETAPE_MAJOR, tape->minor + 128));
|
|
idetape_devs[tape->minor] = NULL;
|
|
g->private_data = NULL;
|
|
put_disk(g);
|
|
kfree(tape);
|
|
}
|
|
|
|
#ifdef CONFIG_IDE_PROC_FS
|
|
static int proc_idetape_read_name
|
|
(char *page, char **start, off_t off, int count, int *eof, void *data)
|
|
{
|
|
ide_drive_t *drive = (ide_drive_t *) data;
|
|
idetape_tape_t *tape = drive->driver_data;
|
|
char *out = page;
|
|
int len;
|
|
|
|
len = sprintf(out, "%s\n", tape->name);
|
|
PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
|
|
}
|
|
|
|
static ide_proc_entry_t idetape_proc[] = {
|
|
{ "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
|
|
{ "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL },
|
|
{ NULL, 0, NULL, NULL }
|
|
};
|
|
#endif
|
|
|
|
static int ide_tape_probe(ide_drive_t *);
|
|
|
|
static ide_driver_t idetape_driver = {
|
|
.gen_driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = "ide-tape",
|
|
.bus = &ide_bus_type,
|
|
},
|
|
.probe = ide_tape_probe,
|
|
.remove = ide_tape_remove,
|
|
.version = IDETAPE_VERSION,
|
|
.media = ide_tape,
|
|
.supports_dsc_overlap = 1,
|
|
.do_request = idetape_do_request,
|
|
.end_request = idetape_end_request,
|
|
.error = __ide_error,
|
|
.abort = __ide_abort,
|
|
#ifdef CONFIG_IDE_PROC_FS
|
|
.proc = idetape_proc,
|
|
#endif
|
|
};
|
|
|
|
/*
|
|
* Our character device supporting functions, passed to register_chrdev.
|
|
*/
|
|
static const struct file_operations idetape_fops = {
|
|
.owner = THIS_MODULE,
|
|
.read = idetape_chrdev_read,
|
|
.write = idetape_chrdev_write,
|
|
.ioctl = idetape_chrdev_ioctl,
|
|
.open = idetape_chrdev_open,
|
|
.release = idetape_chrdev_release,
|
|
};
|
|
|
|
static int idetape_open(struct inode *inode, struct file *filp)
|
|
{
|
|
struct gendisk *disk = inode->i_bdev->bd_disk;
|
|
struct ide_tape_obj *tape;
|
|
|
|
if (!(tape = ide_tape_get(disk)))
|
|
return -ENXIO;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int idetape_release(struct inode *inode, struct file *filp)
|
|
{
|
|
struct gendisk *disk = inode->i_bdev->bd_disk;
|
|
struct ide_tape_obj *tape = ide_tape_g(disk);
|
|
|
|
ide_tape_put(tape);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int idetape_ioctl(struct inode *inode, struct file *file,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct block_device *bdev = inode->i_bdev;
|
|
struct ide_tape_obj *tape = ide_tape_g(bdev->bd_disk);
|
|
ide_drive_t *drive = tape->drive;
|
|
int err = generic_ide_ioctl(drive, file, bdev, cmd, arg);
|
|
if (err == -EINVAL)
|
|
err = idetape_blkdev_ioctl(drive, cmd, arg);
|
|
return err;
|
|
}
|
|
|
|
static struct block_device_operations idetape_block_ops = {
|
|
.owner = THIS_MODULE,
|
|
.open = idetape_open,
|
|
.release = idetape_release,
|
|
.ioctl = idetape_ioctl,
|
|
};
|
|
|
|
static int ide_tape_probe(ide_drive_t *drive)
|
|
{
|
|
idetape_tape_t *tape;
|
|
struct gendisk *g;
|
|
int minor;
|
|
|
|
if (!strstr("ide-tape", drive->driver_req))
|
|
goto failed;
|
|
if (!drive->present)
|
|
goto failed;
|
|
if (drive->media != ide_tape)
|
|
goto failed;
|
|
if (!idetape_identify_device (drive)) {
|
|
printk(KERN_ERR "ide-tape: %s: not supported by this version of ide-tape\n", drive->name);
|
|
goto failed;
|
|
}
|
|
if (drive->scsi) {
|
|
printk("ide-tape: passing drive %s to ide-scsi emulation.\n", drive->name);
|
|
goto failed;
|
|
}
|
|
if (strstr(drive->id->model, "OnStream DI-")) {
|
|
printk(KERN_WARNING "ide-tape: Use drive %s with ide-scsi emulation and osst.\n", drive->name);
|
|
printk(KERN_WARNING "ide-tape: OnStream support will be removed soon from ide-tape!\n");
|
|
}
|
|
tape = kzalloc(sizeof (idetape_tape_t), GFP_KERNEL);
|
|
if (tape == NULL) {
|
|
printk(KERN_ERR "ide-tape: %s: Can't allocate a tape structure\n", drive->name);
|
|
goto failed;
|
|
}
|
|
|
|
g = alloc_disk(1 << PARTN_BITS);
|
|
if (!g)
|
|
goto out_free_tape;
|
|
|
|
ide_init_disk(g, drive);
|
|
|
|
ide_proc_register_driver(drive, &idetape_driver);
|
|
|
|
kref_init(&tape->kref);
|
|
|
|
tape->drive = drive;
|
|
tape->driver = &idetape_driver;
|
|
tape->disk = g;
|
|
|
|
g->private_data = &tape->driver;
|
|
|
|
drive->driver_data = tape;
|
|
|
|
mutex_lock(&idetape_ref_mutex);
|
|
for (minor = 0; idetape_devs[minor]; minor++)
|
|
;
|
|
idetape_devs[minor] = tape;
|
|
mutex_unlock(&idetape_ref_mutex);
|
|
|
|
idetape_setup(drive, tape, minor);
|
|
|
|
device_create(idetape_sysfs_class, &drive->gendev,
|
|
MKDEV(IDETAPE_MAJOR, minor), "%s", tape->name);
|
|
device_create(idetape_sysfs_class, &drive->gendev,
|
|
MKDEV(IDETAPE_MAJOR, minor + 128), "n%s", tape->name);
|
|
|
|
g->fops = &idetape_block_ops;
|
|
ide_register_region(g);
|
|
|
|
return 0;
|
|
|
|
out_free_tape:
|
|
kfree(tape);
|
|
failed:
|
|
return -ENODEV;
|
|
}
|
|
|
|
MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
static void __exit idetape_exit (void)
|
|
{
|
|
driver_unregister(&idetape_driver.gen_driver);
|
|
class_destroy(idetape_sysfs_class);
|
|
unregister_chrdev(IDETAPE_MAJOR, "ht");
|
|
}
|
|
|
|
static int __init idetape_init(void)
|
|
{
|
|
int error = 1;
|
|
idetape_sysfs_class = class_create(THIS_MODULE, "ide_tape");
|
|
if (IS_ERR(idetape_sysfs_class)) {
|
|
idetape_sysfs_class = NULL;
|
|
printk(KERN_ERR "Unable to create sysfs class for ide tapes\n");
|
|
error = -EBUSY;
|
|
goto out;
|
|
}
|
|
|
|
if (register_chrdev(IDETAPE_MAJOR, "ht", &idetape_fops)) {
|
|
printk(KERN_ERR "ide-tape: Failed to register character device interface\n");
|
|
error = -EBUSY;
|
|
goto out_free_class;
|
|
}
|
|
|
|
error = driver_register(&idetape_driver.gen_driver);
|
|
if (error)
|
|
goto out_free_driver;
|
|
|
|
return 0;
|
|
|
|
out_free_driver:
|
|
driver_unregister(&idetape_driver.gen_driver);
|
|
out_free_class:
|
|
class_destroy(idetape_sysfs_class);
|
|
out:
|
|
return error;
|
|
}
|
|
|
|
MODULE_ALIAS("ide:*m-tape*");
|
|
module_init(idetape_init);
|
|
module_exit(idetape_exit);
|
|
MODULE_ALIAS_CHARDEV_MAJOR(IDETAPE_MAJOR);
|