iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
a6b227d70d
linux/drivers/scsi/sd.c
Linus Torvalds bfa8f18691 SCSI misc on 20240322 
The vfs has long had a write lifetime hint mechanism that gives the
 expected longevity on storage of the data being written.  f2fs was the
 original consumer of this and used the hint for flash data placement
 (mostly to avoid write amplification by placing objects with similar
 lifetimes in the same erase block).  More recently the SCSI based UFS
 (Universal Flash Storage) drivers have wanted to take advantage of
 this as well, for the same reasons as f2fs, necessitating plumbing the
 write hints through the block layer and then adding it to the SCSI
 core.  The vfs write_hints pull you've already taken plumbs this as
 far as block and this pull request completes the SCSI core enabling
 based on a recently agreed reuse of the old write command group
 number.  The additions to the scsi_debug driver are for emulating this
 property so we can run tests on it in the absence of an actual UFS
 device.
 
 Signed-off-by: James E.J. Bottomley <jejb@linux.ibm.com>
 -----BEGIN PGP SIGNATURE-----
 
 iJwEABMIAEQWIQTnYEDbdso9F2cI+arnQslM7pishQUCZf3owyYcamFtZXMuYm90
 dG9tbGV5QGhhbnNlbnBhcnRuZXJzaGlwLmNvbQAKCRDnQslM7pishdaeAQCdEb5j
 d7sJiKTpSpgH0znAJ7UTvwUh6UJu/dj47D4qngEA43IULG8+L4GXDHL9mwCfeHC5
 PU7UewCEqnRBSBTdiEw=
 =9Xr2
 -----END PGP SIGNATURE-----

Merge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi

Pull more SCSI updates from James Bottomley:
 "The vfs has long had a write lifetime hint mechanism that gives the
  expected longevity on storage of the data being written. f2fs was the
  original consumer of this and used the hint for flash data placement
  (mostly to avoid write amplification by placing objects with similar
  lifetimes in the same erase block).

  More recently the SCSI based UFS (Universal Flash Storage) drivers
  have wanted to take advantage of this as well, for the same reasons as
  f2fs, necessitating plumbing the write hints through the block layer
  and then adding it to the SCSI core.

  The vfs write_hints already taken plumbs this as far as block and this
  completes the SCSI core enabling based on a recently agreed reuse of
  the old write command group number. The additions to the scsi_debug
  driver are for emulating this property so we can run tests on it in
  the absence of an actual UFS device"

* tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
  scsi: scsi_debug: Maintain write statistics per group number
  scsi: scsi_debug: Implement GET STREAM STATUS
  scsi: scsi_debug: Implement the IO Advice Hints Grouping mode page
  scsi: scsi_debug: Allocate the MODE SENSE response from the heap
  scsi: scsi_debug: Rework subpage code error handling
  scsi: scsi_debug: Rework page code error handling
  scsi: scsi_debug: Support the block limits extension VPD page
  scsi: scsi_debug: Reduce code duplication
  scsi: sd: Translate data lifetime information
  scsi: scsi_proto: Add structures and constants related to I/O groups and streams
  scsi: core: Query the Block Limits Extension VPD page
2024-03-22 13:31:07 -07:00

4294 lines
112 KiB
C
Raw Blame History

// SPDX-License-Identifier: GPL-2.0-only
/*
* sd.c Copyright (C) 1992 Drew Eckhardt
* Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
*
* Linux scsi disk driver
* Initial versions: Drew Eckhardt
* Subsequent revisions: Eric Youngdale
* Modification history:
* - Drew Eckhardt <drew@colorado.edu> original
* - Eric Youngdale <eric@andante.org> add scatter-gather, multiple
* outstanding request, and other enhancements.
* Support loadable low-level scsi drivers.
* - Jirka Hanika <geo@ff.cuni.cz> support more scsi disks using
* eight major numbers.
* - Richard Gooch <rgooch@atnf.csiro.au> support devfs.
* - Torben Mathiasen <tmm@image.dk> Resource allocation fixes in
* sd_init and cleanups.
* - Alex Davis <letmein@erols.com> Fix problem where partition info
* not being read in sd_open. Fix problem where removable media
* could be ejected after sd_open.
* - Douglas Gilbert <dgilbert@interlog.com> cleanup for lk 2.5.x
* - Badari Pulavarty <pbadari@us.ibm.com>, Matthew Wilcox
* <willy@debian.org>, Kurt Garloff <garloff@suse.de>:
* Support 32k/1M disks.
*
* Logging policy (needs CONFIG_SCSI_LOGGING defined):
* - setting up transfer: SCSI_LOG_HLQUEUE levels 1 and 2
* - end of transfer (bh + scsi_lib): SCSI_LOG_HLCOMPLETE level 1
* - entering sd_ioctl: SCSI_LOG_IOCTL level 1
* - entering other commands: SCSI_LOG_HLQUEUE level 3
* Note: when the logging level is set by the user, it must be greater
* than the level indicated above to trigger output.
*/
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/bio.h>
#include <linux/hdreg.h>
#include <linux/errno.h>
#include <linux/idr.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/blkpg.h>
#include <linux/blk-pm.h>
#include <linux/delay.h>
#include <linux/rw_hint.h>
#include <linux/major.h>
#include <linux/mutex.h>
#include <linux/string_helpers.h>
#include <linux/slab.h>
#include <linux/sed-opal.h>
#include <linux/pm_runtime.h>
#include <linux/pr.h>
#include <linux/t10-pi.h>
#include <linux/uaccess.h>
#include <asm/unaligned.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_dbg.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_driver.h>
#include <scsi/scsi_eh.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_ioctl.h>
#include <scsi/scsicam.h>
#include <scsi/scsi_common.h>
#include "sd.h"
#include "scsi_priv.h"
#include "scsi_logging.h"
MODULE_AUTHOR("Eric Youngdale");
MODULE_DESCRIPTION("SCSI disk (sd) driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
MODULE_ALIAS_SCSI_DEVICE(TYPE_ZBC);
#define SD_MINORS 16
static void sd_config_discard(struct scsi_disk *, unsigned int);
static void sd_config_write_same(struct scsi_disk *);
static int sd_revalidate_disk(struct gendisk *);
static void sd_unlock_native_capacity(struct gendisk *disk);
static void sd_shutdown(struct device *);
static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
static void scsi_disk_release(struct device *cdev);
static DEFINE_IDA(sd_index_ida);
static mempool_t *sd_page_pool;
static struct lock_class_key sd_bio_compl_lkclass;
static const char *sd_cache_types[] = {
"write through", "none", "write back",
"write back, no read (daft)"
};
static void sd_set_flush_flag(struct scsi_disk *sdkp)
{
bool wc = false, fua = false;
if (sdkp->WCE) {
wc = true;
if (sdkp->DPOFUA)
fua = true;
}
blk_queue_write_cache(sdkp->disk->queue, wc, fua);
}
static ssize_t
cache_type_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
int ct, rcd, wce, sp;
struct scsi_disk *sdkp = to_scsi_disk(dev);
struct scsi_device *sdp = sdkp->device;
char buffer[64];
char *buffer_data;
struct scsi_mode_data data;
struct scsi_sense_hdr sshdr;
static const char temp[] = "temporary ";
int len, ret;
if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
/* no cache control on RBC devices; theoretically they
* can do it, but there's probably so many exceptions
* it's not worth the risk */
return -EINVAL;
if (strncmp(buf, temp, sizeof(temp) - 1) == 0) {
buf += sizeof(temp) - 1;
sdkp->cache_override = 1;
} else {
sdkp->cache_override = 0;
}
ct = sysfs_match_string(sd_cache_types, buf);
if (ct < 0)
return -EINVAL;
rcd = ct & 0x01 ? 1 : 0;
wce = (ct & 0x02) && !sdkp->write_prot ? 1 : 0;
if (sdkp->cache_override) {
sdkp->WCE = wce;
sdkp->RCD = rcd;
sd_set_flush_flag(sdkp);
return count;
}
if (scsi_mode_sense(sdp, 0x08, 8, 0, buffer, sizeof(buffer), SD_TIMEOUT,
sdkp->max_retries, &data, NULL))
return -EINVAL;
len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
data.block_descriptor_length);
buffer_data = buffer + data.header_length +
data.block_descriptor_length;
buffer_data[2] &= ~0x05;
buffer_data[2] |= wce << 2 | rcd;
sp = buffer_data[0] & 0x80 ? 1 : 0;
buffer_data[0] &= ~0x80;
/*
* Ensure WP, DPOFUA, and RESERVED fields are cleared in
* received mode parameter buffer before doing MODE SELECT.
*/
data.device_specific = 0;
ret = scsi_mode_select(sdp, 1, sp, buffer_data, len, SD_TIMEOUT,
sdkp->max_retries, &data, &sshdr);
if (ret) {
if (ret > 0 && scsi_sense_valid(&sshdr))
sd_print_sense_hdr(sdkp, &sshdr);
return -EINVAL;
}
sd_revalidate_disk(sdkp->disk);
return count;
}
static ssize_t
manage_start_stop_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct scsi_disk *sdkp = to_scsi_disk(dev);
struct scsi_device *sdp = sdkp->device;
return sysfs_emit(buf, "%u\n",
sdp->manage_system_start_stop &&
sdp->manage_runtime_start_stop &&
sdp->manage_shutdown);
}
static DEVICE_ATTR_RO(manage_start_stop);
static ssize_t
manage_system_start_stop_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct scsi_disk *sdkp = to_scsi_disk(dev);
struct scsi_device *sdp = sdkp->device;
return sysfs_emit(buf, "%u\n", sdp->manage_system_start_stop);
}
static ssize_t
manage_system_start_stop_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct scsi_disk *sdkp = to_scsi_disk(dev);
struct scsi_device *sdp = sdkp->device;
bool v;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (kstrtobool(buf, &v))
return -EINVAL;
sdp->manage_system_start_stop = v;
return count;
}
static DEVICE_ATTR_RW(manage_system_start_stop);
static ssize_t
manage_runtime_start_stop_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct scsi_disk *sdkp = to_scsi_disk(dev);
struct scsi_device *sdp = sdkp->device;
return sysfs_emit(buf, "%u\n", sdp->manage_runtime_start_stop);
}
static ssize_t
manage_runtime_start_stop_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct scsi_disk *sdkp = to_scsi_disk(dev);
struct scsi_device *sdp = sdkp->device;
bool v;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (kstrtobool(buf, &v))
return -EINVAL;
sdp->manage_runtime_start_stop = v;
return count;
}
static DEVICE_ATTR_RW(manage_runtime_start_stop);
static ssize_t manage_shutdown_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct scsi_disk *sdkp = to_scsi_disk(dev);
struct scsi_device *sdp = sdkp->device;
return sysfs_emit(buf, "%u\n", sdp->manage_shutdown);
}
static ssize_t manage_shutdown_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct scsi_disk *sdkp = to_scsi_disk(dev);
struct scsi_device *sdp = sdkp->device;
bool v;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (kstrtobool(buf, &v))
return -EINVAL;
sdp->manage_shutdown = v;
return count;
}
static DEVICE_ATTR_RW(manage_shutdown);
static ssize_t
allow_restart_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct scsi_disk *sdkp = to_scsi_disk(dev);
return sprintf(buf, "%u\n", sdkp->device->allow_restart);
}
static ssize_t
allow_restart_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
bool v;
struct scsi_disk *sdkp = to_scsi_disk(dev);
struct scsi_device *sdp = sdkp->device;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
return -EINVAL;
if (kstrtobool(buf, &v))
return -EINVAL;
sdp->allow_restart = v;
return count;
}
static DEVICE_ATTR_RW(allow_restart);
static ssize_t
cache_type_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct scsi_disk *sdkp = to_scsi_disk(dev);
int ct = sdkp->RCD + 2*sdkp->WCE;
return sprintf(buf, "%s\n", sd_cache_types[ct]);
}
static DEVICE_ATTR_RW(cache_type);
static ssize_t
FUA_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct scsi_disk *sdkp = to_scsi_disk(dev);
return sprintf(buf, "%u\n", sdkp->DPOFUA);
}
static DEVICE_ATTR_RO(FUA);
static ssize_t
protection_type_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct scsi_disk *sdkp = to_scsi_disk(dev);
return sprintf(buf, "%u\n", sdkp->protection_type);
}
static ssize_t
protection_type_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct scsi_disk *sdkp = to_scsi_disk(dev);
unsigned int val;
int err;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
err = kstrtouint(buf, 10, &val);
if (err)
return err;
if (val <= T10_PI_TYPE3_PROTECTION)
sdkp->protection_type = val;
return count;
}
static DEVICE_ATTR_RW(protection_type);
static ssize_t
protection_mode_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct scsi_disk *sdkp = to_scsi_disk(dev);
struct scsi_device *sdp = sdkp->device;
unsigned int dif, dix;
dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
if (!dix && scsi_host_dix_capable(sdp->host, T10_PI_TYPE0_PROTECTION)) {
dif = 0;
dix = 1;
}
if (!dif && !dix)
return sprintf(buf, "none\n");
return sprintf(buf, "%s%u\n", dix ? "dix" : "dif", dif);
}
static DEVICE_ATTR_RO(protection_mode);
static ssize_t
app_tag_own_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct scsi_disk *sdkp = to_scsi_disk(dev);
return sprintf(buf, "%u\n", sdkp->ATO);
}
static DEVICE_ATTR_RO(app_tag_own);
static ssize_t
thin_provisioning_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct scsi_disk *sdkp = to_scsi_disk(dev);
return sprintf(buf, "%u\n", sdkp->lbpme);
}
static DEVICE_ATTR_RO(thin_provisioning);
/* sysfs_match_string() requires dense arrays */
static const char *lbp_mode[] = {
[SD_LBP_FULL] = "full",
[SD_LBP_UNMAP] = "unmap",
[SD_LBP_WS16] = "writesame_16",
[SD_LBP_WS10] = "writesame_10",
[SD_LBP_ZERO] = "writesame_zero",
[SD_LBP_DISABLE] = "disabled",
};
static ssize_t
provisioning_mode_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct scsi_disk *sdkp = to_scsi_disk(dev);
return sprintf(buf, "%s\n", lbp_mode[sdkp->provisioning_mode]);
}
static ssize_t
provisioning_mode_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct scsi_disk *sdkp = to_scsi_disk(dev);
struct scsi_device *sdp = sdkp->device;
int mode;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (sd_is_zoned(sdkp)) {
sd_config_discard(sdkp, SD_LBP_DISABLE);
return count;
}
if (sdp->type != TYPE_DISK)
return -EINVAL;
mode = sysfs_match_string(lbp_mode, buf);
if (mode < 0)
return -EINVAL;
sd_config_discard(sdkp, mode);
return count;
}
static DEVICE_ATTR_RW(provisioning_mode);
/* sysfs_match_string() requires dense arrays */
static const char *zeroing_mode[] = {
[SD_ZERO_WRITE] = "write",
[SD_ZERO_WS] = "writesame",
[SD_ZERO_WS16_UNMAP] = "writesame_16_unmap",
[SD_ZERO_WS10_UNMAP] = "writesame_10_unmap",
};
static ssize_t
zeroing_mode_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct scsi_disk *sdkp = to_scsi_disk(dev);
return sprintf(buf, "%s\n", zeroing_mode[sdkp->zeroing_mode]);
}
static ssize_t
zeroing_mode_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct scsi_disk *sdkp = to_scsi_disk(dev);
int mode;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
mode = sysfs_match_string(zeroing_mode, buf);
if (mode < 0)
return -EINVAL;
sdkp->zeroing_mode = mode;
return count;
}
static DEVICE_ATTR_RW(zeroing_mode);
static ssize_t
max_medium_access_timeouts_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct scsi_disk *sdkp = to_scsi_disk(dev);
return sprintf(buf, "%u\n", sdkp->max_medium_access_timeouts);
}
static ssize_t
max_medium_access_timeouts_store(struct device *dev,
struct device_attribute *attr, const char *buf,
size_t count)
{
struct scsi_disk *sdkp = to_scsi_disk(dev);
int err;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
return err ? err : count;
}
static DEVICE_ATTR_RW(max_medium_access_timeouts);
static ssize_t
max_write_same_blocks_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct scsi_disk *sdkp = to_scsi_disk(dev);
return sprintf(buf, "%u\n", sdkp->max_ws_blocks);
}
static ssize_t
max_write_same_blocks_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct scsi_disk *sdkp = to_scsi_disk(dev);
struct scsi_device *sdp = sdkp->device;
unsigned long max;
int err;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
return -EINVAL;
err = kstrtoul(buf, 10, &max);
if (err)
return err;
if (max == 0)
sdp->no_write_same = 1;
else if (max <= SD_MAX_WS16_BLOCKS) {
sdp->no_write_same = 0;
sdkp->max_ws_blocks = max;
}
sd_config_write_same(sdkp);
return count;
}
static DEVICE_ATTR_RW(max_write_same_blocks);
static ssize_t
zoned_cap_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct scsi_disk *sdkp = to_scsi_disk(dev);
if (sdkp->device->type == TYPE_ZBC)
return sprintf(buf, "host-managed\n");
if (sdkp->zoned == 1)
return sprintf(buf, "host-aware\n");
if (sdkp->zoned == 2)
return sprintf(buf, "drive-managed\n");
return sprintf(buf, "none\n");
}
static DEVICE_ATTR_RO(zoned_cap);
static ssize_t
max_retries_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct scsi_disk *sdkp = to_scsi_disk(dev);
struct scsi_device *sdev = sdkp->device;
int retries, err;
err = kstrtoint(buf, 10, &retries);
if (err)
return err;
if (retries == SCSI_CMD_RETRIES_NO_LIMIT || retries <= SD_MAX_RETRIES) {
sdkp->max_retries = retries;
return count;
}
sdev_printk(KERN_ERR, sdev, "max_retries must be between -1 and %d\n",
SD_MAX_RETRIES);
return -EINVAL;
}
static ssize_t
max_retries_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct scsi_disk *sdkp = to_scsi_disk(dev);
return sprintf(buf, "%d\n", sdkp->max_retries);
}
static DEVICE_ATTR_RW(max_retries);
static struct attribute *sd_disk_attrs[] = {
&dev_attr_cache_type.attr,
&dev_attr_FUA.attr,
&dev_attr_allow_restart.attr,
&dev_attr_manage_start_stop.attr,
&dev_attr_manage_system_start_stop.attr,
&dev_attr_manage_runtime_start_stop.attr,
&dev_attr_manage_shutdown.attr,
&dev_attr_protection_type.attr,
&dev_attr_protection_mode.attr,
&dev_attr_app_tag_own.attr,
&dev_attr_thin_provisioning.attr,
&dev_attr_provisioning_mode.attr,
&dev_attr_zeroing_mode.attr,
&dev_attr_max_write_same_blocks.attr,
&dev_attr_max_medium_access_timeouts.attr,
&dev_attr_zoned_cap.attr,
&dev_attr_max_retries.attr,
NULL,
};
ATTRIBUTE_GROUPS(sd_disk);
static struct class sd_disk_class = {
.name = "scsi_disk",
.dev_release = scsi_disk_release,
.dev_groups = sd_disk_groups,
};
/*
* Don't request a new module, as that could deadlock in multipath
* environment.
*/
static void sd_default_probe(dev_t devt)
{
}
/*
* Device no to disk mapping:
*
* major disc2 disc p1
* |............|.............|....|....| <- dev_t
* 31 20 19 8 7 4 3 0
*
* Inside a major, we have 16k disks, however mapped non-
* contiguously. The first 16 disks are for major0, the next
* ones with major1, ... Disk 256 is for major0 again, disk 272
* for major1, ...
* As we stay compatible with our numbering scheme, we can reuse
* the well-know SCSI majors 8, 65--71, 136--143.
*/
static int sd_major(int major_idx)
{
switch (major_idx) {
case 0:
return SCSI_DISK0_MAJOR;
case 1 ... 7:
return SCSI_DISK1_MAJOR + major_idx - 1;
case 8 ... 15:
return SCSI_DISK8_MAJOR + major_idx - 8;
default:
BUG();
return 0; /* shut up gcc */
}
}
#ifdef CONFIG_BLK_SED_OPAL
static int sd_sec_submit(void *data, u16 spsp, u8 secp, void *buffer,
size_t len, bool send)
{
struct scsi_disk *sdkp = data;
struct scsi_device *sdev = sdkp->device;
u8 cdb[12] = { 0, };
const struct scsi_exec_args exec_args = {
.req_flags = BLK_MQ_REQ_PM,
};
int ret;
cdb[0] = send ? SECURITY_PROTOCOL_OUT : SECURITY_PROTOCOL_IN;
cdb[1] = secp;
put_unaligned_be16(spsp, &cdb[2]);
put_unaligned_be32(len, &cdb[6]);
ret = scsi_execute_cmd(sdev, cdb, send ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN,
buffer, len, SD_TIMEOUT, sdkp->max_retries,
&exec_args);
return ret <= 0 ? ret : -EIO;
}
#endif /* CONFIG_BLK_SED_OPAL */
/*
* Look up the DIX operation based on whether the command is read or
* write and whether dix and dif are enabled.
*/
static unsigned int sd_prot_op(bool write, bool dix, bool dif)
{
/* Lookup table: bit 2 (write), bit 1 (dix), bit 0 (dif) */
static const unsigned int ops[] = { /* wrt dix dif */
SCSI_PROT_NORMAL, /* 0 0 0 */
SCSI_PROT_READ_STRIP, /* 0 0 1 */
SCSI_PROT_READ_INSERT, /* 0 1 0 */
SCSI_PROT_READ_PASS, /* 0 1 1 */
SCSI_PROT_NORMAL, /* 1 0 0 */
SCSI_PROT_WRITE_INSERT, /* 1 0 1 */
SCSI_PROT_WRITE_STRIP, /* 1 1 0 */
SCSI_PROT_WRITE_PASS, /* 1 1 1 */
};
return ops[write << 2 | dix << 1 | dif];
}
/*
* Returns a mask of the protection flags that are valid for a given DIX
* operation.
*/
static unsigned int sd_prot_flag_mask(unsigned int prot_op)
{
static const unsigned int flag_mask[] = {
[SCSI_PROT_NORMAL] = 0,
[SCSI_PROT_READ_STRIP] = SCSI_PROT_TRANSFER_PI |
SCSI_PROT_GUARD_CHECK |
SCSI_PROT_REF_CHECK |
SCSI_PROT_REF_INCREMENT,
[SCSI_PROT_READ_INSERT] = SCSI_PROT_REF_INCREMENT |
SCSI_PROT_IP_CHECKSUM,
[SCSI_PROT_READ_PASS] = SCSI_PROT_TRANSFER_PI |
SCSI_PROT_GUARD_CHECK |
SCSI_PROT_REF_CHECK |
SCSI_PROT_REF_INCREMENT |
SCSI_PROT_IP_CHECKSUM,
[SCSI_PROT_WRITE_INSERT] = SCSI_PROT_TRANSFER_PI |
SCSI_PROT_REF_INCREMENT,
[SCSI_PROT_WRITE_STRIP] = SCSI_PROT_GUARD_CHECK |
SCSI_PROT_REF_CHECK |
SCSI_PROT_REF_INCREMENT |
SCSI_PROT_IP_CHECKSUM,
[SCSI_PROT_WRITE_PASS] = SCSI_PROT_TRANSFER_PI |
SCSI_PROT_GUARD_CHECK |
SCSI_PROT_REF_CHECK |
SCSI_PROT_REF_INCREMENT |
SCSI_PROT_IP_CHECKSUM,
};
return flag_mask[prot_op];
}
static unsigned char sd_setup_protect_cmnd(struct scsi_cmnd *scmd,
unsigned int dix, unsigned int dif)
{
struct request *rq = scsi_cmd_to_rq(scmd);
struct bio *bio = rq->bio;
unsigned int prot_op = sd_prot_op(rq_data_dir(rq), dix, dif);
unsigned int protect = 0;
if (dix) { /* DIX Type 0, 1, 2, 3 */
if (bio_integrity_flagged(bio, BIP_IP_CHECKSUM))
scmd->prot_flags |= SCSI_PROT_IP_CHECKSUM;
if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
scmd->prot_flags |= SCSI_PROT_GUARD_CHECK;
}
if (dif != T10_PI_TYPE3_PROTECTION) { /* DIX/DIF Type 0, 1, 2 */
scmd->prot_flags |= SCSI_PROT_REF_INCREMENT;
if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
scmd->prot_flags |= SCSI_PROT_REF_CHECK;
}
if (dif) { /* DIX/DIF Type 1, 2, 3 */
scmd->prot_flags |= SCSI_PROT_TRANSFER_PI;
if (bio_integrity_flagged(bio, BIP_DISK_NOCHECK))
protect = 3 << 5; /* Disable target PI checking */
else
protect = 1 << 5; /* Enable target PI checking */
}
scsi_set_prot_op(scmd, prot_op);
scsi_set_prot_type(scmd, dif);
scmd->prot_flags &= sd_prot_flag_mask(prot_op);
return protect;
}
static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
{
struct request_queue *q = sdkp->disk->queue;
unsigned int logical_block_size = sdkp->device->sector_size;
unsigned int max_blocks = 0;
q->limits.discard_alignment =
sdkp->unmap_alignment * logical_block_size;
q->limits.discard_granularity =
max(sdkp->physical_block_size,
sdkp->unmap_granularity * logical_block_size);
sdkp->provisioning_mode = mode;
switch (mode) {
case SD_LBP_FULL:
case SD_LBP_DISABLE:
blk_queue_max_discard_sectors(q, 0);
return;
case SD_LBP_UNMAP:
max_blocks = min_not_zero(sdkp->max_unmap_blocks,
(u32)SD_MAX_WS16_BLOCKS);
break;
case SD_LBP_WS16:
if (sdkp->device->unmap_limit_for_ws)
max_blocks = sdkp->max_unmap_blocks;
else
max_blocks = sdkp->max_ws_blocks;
max_blocks = min_not_zero(max_blocks, (u32)SD_MAX_WS16_BLOCKS);
break;
case SD_LBP_WS10:
if (sdkp->device->unmap_limit_for_ws)
max_blocks = sdkp->max_unmap_blocks;
else
max_blocks = sdkp->max_ws_blocks;
max_blocks = min_not_zero(max_blocks, (u32)SD_MAX_WS10_BLOCKS);
break;
case SD_LBP_ZERO:
max_blocks = min_not_zero(sdkp->max_ws_blocks,
(u32)SD_MAX_WS10_BLOCKS);
break;
}
blk_queue_max_discard_sectors(q, max_blocks * (logical_block_size >> 9));
}
static void *sd_set_special_bvec(struct request *rq, unsigned int data_len)
{
struct page *page;
page = mempool_alloc(sd_page_pool, GFP_ATOMIC);
if (!page)
return NULL;
clear_highpage(page);
bvec_set_page(&rq->special_vec, page, data_len, 0);
rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
return bvec_virt(&rq->special_vec);
}
static blk_status_t sd_setup_unmap_cmnd(struct scsi_cmnd *cmd)
{
struct scsi_device *sdp = cmd->device;
struct request *rq = scsi_cmd_to_rq(cmd);
struct scsi_disk *sdkp = scsi_disk(rq->q->disk);
u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
unsigned int data_len = 24;
char *buf;
buf = sd_set_special_bvec(rq, data_len);
if (!buf)
return BLK_STS_RESOURCE;
cmd->cmd_len = 10;
cmd->cmnd[0] = UNMAP;
cmd->cmnd[8] = 24;
put_unaligned_be16(6 + 16, &buf[0]);
put_unaligned_be16(16, &buf[2]);
put_unaligned_be64(lba, &buf[8]);
put_unaligned_be32(nr_blocks, &buf[16]);
cmd->allowed = sdkp->max_retries;
cmd->transfersize = data_len;
rq->timeout = SD_TIMEOUT;
return scsi_alloc_sgtables(cmd);
}
static blk_status_t sd_setup_write_same16_cmnd(struct scsi_cmnd *cmd,
bool unmap)
{
struct scsi_device *sdp = cmd->device;
struct request *rq = scsi_cmd_to_rq(cmd);
struct scsi_disk *sdkp = scsi_disk(rq->q->disk);
u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
u32 data_len = sdp->sector_size;
if (!sd_set_special_bvec(rq, data_len))
return BLK_STS_RESOURCE;
cmd->cmd_len = 16;
cmd->cmnd[0] = WRITE_SAME_16;
if (unmap)
cmd->cmnd[1] = 0x8; /* UNMAP */
put_unaligned_be64(lba, &cmd->cmnd[2]);
put_unaligned_be32(nr_blocks, &cmd->cmnd[10]);
cmd->allowed = sdkp->max_retries;
cmd->transfersize = data_len;
rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT;
return scsi_alloc_sgtables(cmd);
}
static blk_status_t sd_setup_write_same10_cmnd(struct scsi_cmnd *cmd,
bool unmap)
{
struct scsi_device *sdp = cmd->device;
struct request *rq = scsi_cmd_to_rq(cmd);
struct scsi_disk *sdkp = scsi_disk(rq->q->disk);
u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
u32 data_len = sdp->sector_size;
if (!sd_set_special_bvec(rq, data_len))
return BLK_STS_RESOURCE;
cmd->cmd_len = 10;
cmd->cmnd[0] = WRITE_SAME;
if (unmap)
cmd->cmnd[1] = 0x8; /* UNMAP */
put_unaligned_be32(lba, &cmd->cmnd[2]);
put_unaligned_be16(nr_blocks, &cmd->cmnd[7]);
cmd->allowed = sdkp->max_retries;
cmd->transfersize = data_len;
rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT;
return scsi_alloc_sgtables(cmd);
}
static blk_status_t sd_setup_write_zeroes_cmnd(struct scsi_cmnd *cmd)
{
struct request *rq = scsi_cmd_to_rq(cmd);
struct scsi_device *sdp = cmd->device;
struct scsi_disk *sdkp = scsi_disk(rq->q->disk);
u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
if (!(rq->cmd_flags & REQ_NOUNMAP)) {
switch (sdkp->zeroing_mode) {
case SD_ZERO_WS16_UNMAP:
return sd_setup_write_same16_cmnd(cmd, true);
case SD_ZERO_WS10_UNMAP:
return sd_setup_write_same10_cmnd(cmd, true);
}
}
if (sdp->no_write_same) {
rq->rq_flags |= RQF_QUIET;
return BLK_STS_TARGET;
}
if (sdkp->ws16 || lba > 0xffffffff || nr_blocks > 0xffff)
return sd_setup_write_same16_cmnd(cmd, false);
return sd_setup_write_same10_cmnd(cmd, false);
}
static void sd_config_write_same(struct scsi_disk *sdkp)
{
struct request_queue *q = sdkp->disk->queue;
unsigned int logical_block_size = sdkp->device->sector_size;
if (sdkp->device->no_write_same) {
sdkp->max_ws_blocks = 0;
goto out;
}
/* Some devices can not handle block counts above 0xffff despite
* supporting WRITE SAME(16). Consequently we default to 64k
* blocks per I/O unless the device explicitly advertises a
* bigger limit.
*/
if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
(u32)SD_MAX_WS16_BLOCKS);
else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes)
sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
(u32)SD_MAX_WS10_BLOCKS);
else {
sdkp->device->no_write_same = 1;
sdkp->max_ws_blocks = 0;
}
if (sdkp->lbprz && sdkp->lbpws)
sdkp->zeroing_mode = SD_ZERO_WS16_UNMAP;
else if (sdkp->lbprz && sdkp->lbpws10)
sdkp->zeroing_mode = SD_ZERO_WS10_UNMAP;
else if (sdkp->max_ws_blocks)
sdkp->zeroing_mode = SD_ZERO_WS;
else
sdkp->zeroing_mode = SD_ZERO_WRITE;
if (sdkp->max_ws_blocks &&
sdkp->physical_block_size > logical_block_size) {
/*
* Reporting a maximum number of blocks that is not aligned
* on the device physical size would cause a large write same
* request to be split into physically unaligned chunks by
* __blkdev_issue_write_zeroes() even if the caller of this
* functions took care to align the large request. So make sure
* the maximum reported is aligned to the device physical block
* size. This is only an optional optimization for regular
* disks, but this is mandatory to avoid failure of large write
* same requests directed at sequential write required zones of
* host-managed ZBC disks.
*/
sdkp->max_ws_blocks =
round_down(sdkp->max_ws_blocks,
bytes_to_logical(sdkp->device,
sdkp->physical_block_size));
}
out:
blk_queue_max_write_zeroes_sectors(q, sdkp->max_ws_blocks *
(logical_block_size >> 9));
}
static blk_status_t sd_setup_flush_cmnd(struct scsi_cmnd *cmd)
{
struct request *rq = scsi_cmd_to_rq(cmd);
struct scsi_disk *sdkp = scsi_disk(rq->q->disk);
/* flush requests don't perform I/O, zero the S/G table */
memset(&cmd->sdb, 0, sizeof(cmd->sdb));
if (cmd->device->use_16_for_sync) {
cmd->cmnd[0] = SYNCHRONIZE_CACHE_16;
cmd->cmd_len = 16;
} else {
cmd->cmnd[0] = SYNCHRONIZE_CACHE;
cmd->cmd_len = 10;
}
cmd->transfersize = 0;
cmd->allowed = sdkp->max_retries;
rq->timeout = rq->q->rq_timeout * SD_FLUSH_TIMEOUT_MULTIPLIER;
return BLK_STS_OK;
}
/**
* sd_group_number() - Compute the GROUP NUMBER field
* @cmd: SCSI command for which to compute the value of the six-bit GROUP NUMBER
* field.
*
* From SBC-5 r05 (https://www.t10.org/cgi-bin/ac.pl?t=f&f=sbc5r05.pdf):
* 0: no relative lifetime.
* 1: shortest relative lifetime.
* 2: second shortest relative lifetime.
* 3 - 0x3d: intermediate relative lifetimes.
* 0x3e: second longest relative lifetime.
* 0x3f: longest relative lifetime.
*/
static u8 sd_group_number(struct scsi_cmnd *cmd)
{
const struct request *rq = scsi_cmd_to_rq(cmd);
struct scsi_disk *sdkp = scsi_disk(rq->q->disk);
if (!sdkp->rscs)
return 0;
return min3((u32)rq->write_hint, (u32)sdkp->permanent_stream_count,
0x3fu);
}
static blk_status_t sd_setup_rw32_cmnd(struct scsi_cmnd *cmd, bool write,
sector_t lba, unsigned int nr_blocks,
unsigned char flags, unsigned int dld)
{
cmd->cmd_len = SD_EXT_CDB_SIZE;
cmd->cmnd[0] = VARIABLE_LENGTH_CMD;
cmd->cmnd[6] = sd_group_number(cmd);
cmd->cmnd[7] = 0x18; /* Additional CDB len */
cmd->cmnd[9] = write ? WRITE_32 : READ_32;
cmd->cmnd[10] = flags;
cmd->cmnd[11] = dld & 0x07;
put_unaligned_be64(lba, &cmd->cmnd[12]);
put_unaligned_be32(lba, &cmd->cmnd[20]); /* Expected Indirect LBA */
put_unaligned_be32(nr_blocks, &cmd->cmnd[28]);
return BLK_STS_OK;
}
static blk_status_t sd_setup_rw16_cmnd(struct scsi_cmnd *cmd, bool write,
sector_t lba, unsigned int nr_blocks,
unsigned char flags, unsigned int dld)
{
cmd->cmd_len = 16;
cmd->cmnd[0] = write ? WRITE_16 : READ_16;
cmd->cmnd[1] = flags | ((dld >> 2) & 0x01);
cmd->cmnd[14] = ((dld & 0x03) << 6) | sd_group_number(cmd);
cmd->cmnd[15] = 0;
put_unaligned_be64(lba, &cmd->cmnd[2]);
put_unaligned_be32(nr_blocks, &cmd->cmnd[10]);
return BLK_STS_OK;
}
static blk_status_t sd_setup_rw10_cmnd(struct scsi_cmnd *cmd, bool write,
sector_t lba, unsigned int nr_blocks,
unsigned char flags)
{
cmd->cmd_len = 10;
cmd->cmnd[0] = write ? WRITE_10 : READ_10;
cmd->cmnd[1] = flags;
cmd->cmnd[6] = sd_group_number(cmd);
cmd->cmnd[9] = 0;
put_unaligned_be32(lba, &cmd->cmnd[2]);
put_unaligned_be16(nr_blocks, &cmd->cmnd[7]);
return BLK_STS_OK;
}
static blk_status_t sd_setup_rw6_cmnd(struct scsi_cmnd *cmd, bool write,
sector_t lba, unsigned int nr_blocks,
unsigned char flags)
{
/* Avoid that 0 blocks gets translated into 256 blocks. */
if (WARN_ON_ONCE(nr_blocks == 0))
return BLK_STS_IOERR;
if (unlikely(flags & 0x8)) {
/*
* This happens only if this drive failed 10byte rw
* command with ILLEGAL_REQUEST during operation and
* thus turned off use_10_for_rw.
*/
scmd_printk(KERN_ERR, cmd, "FUA write on READ/WRITE(6) drive\n");
return BLK_STS_IOERR;
}
cmd->cmd_len = 6;
cmd->cmnd[0] = write ? WRITE_6 : READ_6;
cmd->cmnd[1] = (lba >> 16) & 0x1f;
cmd->cmnd[2] = (lba >> 8) & 0xff;
cmd->cmnd[3] = lba & 0xff;
cmd->cmnd[4] = nr_blocks;
cmd->cmnd[5] = 0;
return BLK_STS_OK;
}
/*
* Check if a command has a duration limit set. If it does, and the target
* device supports CDL and the feature is enabled, return the limit
* descriptor index to use. Return 0 (no limit) otherwise.
*/
static int sd_cdl_dld(struct scsi_disk *sdkp, struct scsi_cmnd *scmd)
{
struct scsi_device *sdp = sdkp->device;
int hint;
if (!sdp->cdl_supported || !sdp->cdl_enable)
return 0;
/*
* Use "no limit" if the request ioprio does not specify a duration
* limit hint.
*/
hint = IOPRIO_PRIO_HINT(req_get_ioprio(scsi_cmd_to_rq(scmd)));
if (hint < IOPRIO_HINT_DEV_DURATION_LIMIT_1 ||
hint > IOPRIO_HINT_DEV_DURATION_LIMIT_7)
return 0;
return (hint - IOPRIO_HINT_DEV_DURATION_LIMIT_1) + 1;
}
static blk_status_t sd_setup_read_write_cmnd(struct scsi_cmnd *cmd)
{
struct request *rq = scsi_cmd_to_rq(cmd);
struct scsi_device *sdp = cmd->device;
struct scsi_disk *sdkp = scsi_disk(rq->q->disk);
sector_t lba = sectors_to_logical(sdp, blk_rq_pos(rq));
sector_t threshold;
unsigned int nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
unsigned int mask = logical_to_sectors(sdp, 1) - 1;
bool write = rq_data_dir(rq) == WRITE;
unsigned char protect, fua;
unsigned int dld;
blk_status_t ret;
unsigned int dif;
bool dix;
ret = scsi_alloc_sgtables(cmd);
if (ret != BLK_STS_OK)
return ret;
ret = BLK_STS_IOERR;
if (!scsi_device_online(sdp) || sdp->changed) {
scmd_printk(KERN_ERR, cmd, "device offline or changed\n");
goto fail;
}
if (blk_rq_pos(rq) + blk_rq_sectors(rq) > get_capacity(rq->q->disk)) {
scmd_printk(KERN_ERR, cmd, "access beyond end of device\n");
goto fail;
}
if ((blk_rq_pos(rq) & mask) || (blk_rq_sectors(rq) & mask)) {
scmd_printk(KERN_ERR, cmd, "request not aligned to the logical block size\n");
goto fail;
}
/*
* Some SD card readers can't handle accesses which touch the
* last one or two logical blocks. Split accesses as needed.
*/
threshold = sdkp->capacity - SD_LAST_BUGGY_SECTORS;
if (unlikely(sdp->last_sector_bug && lba + nr_blocks > threshold)) {
if (lba < threshold) {
/* Access up to the threshold but not beyond */
nr_blocks = threshold - lba;
} else {
/* Access only a single logical block */
nr_blocks = 1;
}
}
if (req_op(rq) == REQ_OP_ZONE_APPEND) {
ret = sd_zbc_prepare_zone_append(cmd, &lba, nr_blocks);
if (ret)
goto fail;
}
fua = rq->cmd_flags & REQ_FUA ? 0x8 : 0;
dix = scsi_prot_sg_count(cmd);
dif = scsi_host_dif_capable(cmd->device->host, sdkp->protection_type);
dld = sd_cdl_dld(sdkp, cmd);
if (dif || dix)
protect = sd_setup_protect_cmnd(cmd, dix, dif);
else
protect = 0;
if (protect && sdkp->protection_type == T10_PI_TYPE2_PROTECTION) {
ret = sd_setup_rw32_cmnd(cmd, write, lba, nr_blocks,
protect | fua, dld);
} else if (sdp->use_16_for_rw || (nr_blocks > 0xffff)) {
ret = sd_setup_rw16_cmnd(cmd, write, lba, nr_blocks,
protect | fua, dld);
} else if ((nr_blocks > 0xff) || (lba > 0x1fffff) ||
sdp->use_10_for_rw || protect || rq->write_hint) {
ret = sd_setup_rw10_cmnd(cmd, write, lba, nr_blocks,
protect | fua);
} else {
ret = sd_setup_rw6_cmnd(cmd, write, lba, nr_blocks,
protect | fua);
}
if (unlikely(ret != BLK_STS_OK))
goto fail;
/*
* We shouldn't disconnect in the middle of a sector, so with a dumb
* host adapter, it's safe to assume that we can at least transfer
* this many bytes between each connect / disconnect.
*/
cmd->transfersize = sdp->sector_size;
cmd->underflow = nr_blocks << 9;
cmd->allowed = sdkp->max_retries;
cmd->sdb.length = nr_blocks * sdp->sector_size;
SCSI_LOG_HLQUEUE(1,
scmd_printk(KERN_INFO, cmd,
"%s: block=%llu, count=%d\n", __func__,
(unsigned long long)blk_rq_pos(rq),
blk_rq_sectors(rq)));
SCSI_LOG_HLQUEUE(2,
scmd_printk(KERN_INFO, cmd,
"%s %d/%u 512 byte blocks.\n",
write ? "writing" : "reading", nr_blocks,
blk_rq_sectors(rq)));
/*
* This indicates that the command is ready from our end to be queued.
*/
return BLK_STS_OK;
fail:
scsi_free_sgtables(cmd);
return ret;
}
static blk_status_t sd_init_command(struct scsi_cmnd *cmd)
{
struct request *rq = scsi_cmd_to_rq(cmd);
switch (req_op(rq)) {
case REQ_OP_DISCARD:
switch (scsi_disk(rq->q->disk)->provisioning_mode) {
case SD_LBP_UNMAP:
return sd_setup_unmap_cmnd(cmd);
case SD_LBP_WS16:
return sd_setup_write_same16_cmnd(cmd, true);
case SD_LBP_WS10:
return sd_setup_write_same10_cmnd(cmd, true);
case SD_LBP_ZERO:
return sd_setup_write_same10_cmnd(cmd, false);
default:
return BLK_STS_TARGET;
}
case REQ_OP_WRITE_ZEROES:
return sd_setup_write_zeroes_cmnd(cmd);
case REQ_OP_FLUSH:
return sd_setup_flush_cmnd(cmd);
case REQ_OP_READ:
case REQ_OP_WRITE:
case REQ_OP_ZONE_APPEND:
return sd_setup_read_write_cmnd(cmd);
case REQ_OP_ZONE_RESET:
return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_RESET_WRITE_POINTER,
false);
case REQ_OP_ZONE_RESET_ALL:
return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_RESET_WRITE_POINTER,
true);
case REQ_OP_ZONE_OPEN:
return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_OPEN_ZONE, false);
case REQ_OP_ZONE_CLOSE:
return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_CLOSE_ZONE, false);
case REQ_OP_ZONE_FINISH:
return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_FINISH_ZONE, false);
default:
WARN_ON_ONCE(1);
return BLK_STS_NOTSUPP;
}
}
static void sd_uninit_command(struct scsi_cmnd *SCpnt)
{
struct request *rq = scsi_cmd_to_rq(SCpnt);
if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
mempool_free(rq->special_vec.bv_page, sd_page_pool);
}
static bool sd_need_revalidate(struct gendisk *disk, struct scsi_disk *sdkp)
{
if (sdkp->device->removable || sdkp->write_prot) {
if (disk_check_media_change(disk))
return true;
}
/*
* Force a full rescan after ioctl(BLKRRPART). While the disk state has
* nothing to do with partitions, BLKRRPART is used to force a full
* revalidate after things like a format for historical reasons.
*/
return test_bit(GD_NEED_PART_SCAN, &disk->state);
}
/**
* sd_open - open a scsi disk device
* @disk: disk to open
* @mode: open mode
*
* Returns 0 if successful. Returns a negated errno value in case
* of error.
*
* Note: This can be called from a user context (e.g. fsck(1) )
* or from within the kernel (e.g. as a result of a mount(1) ).
* In the latter case @inode and @filp carry an abridged amount
* of information as noted above.
*
* Locking: called with disk->open_mutex held.
**/
static int sd_open(struct gendisk *disk, blk_mode_t mode)
{
struct scsi_disk *sdkp = scsi_disk(disk);
struct scsi_device *sdev = sdkp->device;
int retval;
if (scsi_device_get(sdev))
return -ENXIO;
SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
/*
* If the device is in error recovery, wait until it is done.
* If the device is offline, then disallow any access to it.
*/
retval = -ENXIO;
if (!scsi_block_when_processing_errors(sdev))
goto error_out;
if (sd_need_revalidate(disk, sdkp))
sd_revalidate_disk(disk);
/*
* If the drive is empty, just let the open fail.
*/
retval = -ENOMEDIUM;
if (sdev->removable && !sdkp->media_present &&
!(mode & BLK_OPEN_NDELAY))
goto error_out;
/*
* If the device has the write protect tab set, have the open fail
* if the user expects to be able to write to the thing.
*/
retval = -EROFS;
if (sdkp->write_prot && (mode & BLK_OPEN_WRITE))
goto error_out;
/*
* It is possible that the disk changing stuff resulted in
* the device being taken offline. If this is the case,
* report this to the user, and don't pretend that the
* open actually succeeded.
*/
retval = -ENXIO;
if (!scsi_device_online(sdev))
goto error_out;
if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
if (scsi_block_when_processing_errors(sdev))
scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
}
return 0;
error_out:
scsi_device_put(sdev);
return retval;
}
/**
* sd_release - invoked when the (last) close(2) is called on this
* scsi disk.
* @disk: disk to release
*
* Returns 0.
*
* Note: may block (uninterruptible) if error recovery is underway
* on this disk.
*
* Locking: called with disk->open_mutex held.
**/
static void sd_release(struct gendisk *disk)
{
struct scsi_disk *sdkp = scsi_disk(disk);
struct scsi_device *sdev = sdkp->device;
SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
if (scsi_block_when_processing_errors(sdev))
scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
}
scsi_device_put(sdev);
}
static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
{
struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
struct scsi_device *sdp = sdkp->device;
struct Scsi_Host *host = sdp->host;
sector_t capacity = logical_to_sectors(sdp, sdkp->capacity);
int diskinfo[4];
/* default to most commonly used values */
diskinfo[0] = 0x40; /* 1 << 6 */
diskinfo[1] = 0x20; /* 1 << 5 */
diskinfo[2] = capacity >> 11;
/* override with calculated, extended default, or driver values */
if (host->hostt->bios_param)
host->hostt->bios_param(sdp, bdev, capacity, diskinfo);
else
scsicam_bios_param(bdev, capacity, diskinfo);
geo->heads = diskinfo[0];
geo->sectors = diskinfo[1];
geo->cylinders = diskinfo[2];
return 0;
}
/**
* sd_ioctl - process an ioctl
* @bdev: target block device
* @mode: open mode
* @cmd: ioctl command number
* @arg: this is third argument given to ioctl(2) system call.
* Often contains a pointer.
*
* Returns 0 if successful (some ioctls return positive numbers on
* success as well). Returns a negated errno value in case of error.
*
* Note: most ioctls are forward onto the block subsystem or further
* down in the scsi subsystem.
**/
static int sd_ioctl(struct block_device *bdev, blk_mode_t mode,
unsigned int cmd, unsigned long arg)
{
struct gendisk *disk = bdev->bd_disk;
struct scsi_disk *sdkp = scsi_disk(disk);
struct scsi_device *sdp = sdkp->device;
void __user *p = (void __user *)arg;
int error;
SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
"cmd=0x%x\n", disk->disk_name, cmd));
if (bdev_is_partition(bdev) && !capable(CAP_SYS_RAWIO))
return -ENOIOCTLCMD;
/*
* If we are in the middle of error recovery, don't let anyone
* else try and use this device. Also, if error recovery fails, it
* may try and take the device offline, in which case all further
* access to the device is prohibited.
*/
error = scsi_ioctl_block_when_processing_errors(sdp, cmd,
(mode & BLK_OPEN_NDELAY));
if (error)
return error;
if (is_sed_ioctl(cmd))
return sed_ioctl(sdkp->opal_dev, cmd, p);
return scsi_ioctl(sdp, mode & BLK_OPEN_WRITE, cmd, p);
}
static void set_media_not_present(struct scsi_disk *sdkp)
{
if (sdkp->media_present)
sdkp->device->changed = 1;
if (sdkp->device->removable) {
sdkp->media_present = 0;
sdkp->capacity = 0;
}
}
static int media_not_present(struct scsi_disk *sdkp,
struct scsi_sense_hdr *sshdr)
{
if (!scsi_sense_valid(sshdr))
return 0;
/* not invoked for commands that could return deferred errors */
switch (sshdr->sense_key) {
case UNIT_ATTENTION:
case NOT_READY:
/* medium not present */
if (sshdr->asc == 0x3A) {
set_media_not_present(sdkp);
return 1;
}
}
return 0;
}
/**
* sd_check_events - check media events
* @disk: kernel device descriptor
* @clearing: disk events currently being cleared
*
* Returns mask of DISK_EVENT_*.
*
* Note: this function is invoked from the block subsystem.
**/
static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
{
struct scsi_disk *sdkp = disk->private_data;
struct scsi_device *sdp;
int retval;
bool disk_changed;
if (!sdkp)
return 0;
sdp = sdkp->device;
SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
/*
* If the device is offline, don't send any commands - just pretend as
* if the command failed. If the device ever comes back online, we
* can deal with it then. It is only because of unrecoverable errors
* that we would ever take a device offline in the first place.
*/
if (!scsi_device_online(sdp)) {
set_media_not_present(sdkp);
goto out;
}
/*
* Using TEST_UNIT_READY enables differentiation between drive with
* no cartridge loaded - NOT READY, drive with changed cartridge -
* UNIT ATTENTION, or with same cartridge - GOOD STATUS.
*
* Drives that auto spin down. eg iomega jaz 1G, will be started
* by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
* sd_revalidate() is called.
*/
if (scsi_block_when_processing_errors(sdp)) {
struct scsi_sense_hdr sshdr = { 0, };
retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, sdkp->max_retries,
&sshdr);
/* failed to execute TUR, assume media not present */
if (retval < 0 || host_byte(retval)) {
set_media_not_present(sdkp);
goto out;
}
if (media_not_present(sdkp, &sshdr))
goto out;
}
/*
* For removable scsi disk we have to recognise the presence
* of a disk in the drive.
*/
if (!sdkp->media_present)
sdp->changed = 1;
sdkp->media_present = 1;
out:
/*
* sdp->changed is set under the following conditions:
*
* Medium present state has changed in either direction.
* Device has indicated UNIT_ATTENTION.
*/
disk_changed = sdp->changed;
sdp->changed = 0;
return disk_changed ? DISK_EVENT_MEDIA_CHANGE : 0;
}
static int sd_sync_cache(struct scsi_disk *sdkp)
{
int res;
struct scsi_device *sdp = sdkp->device;
const int timeout = sdp->request_queue->rq_timeout
* SD_FLUSH_TIMEOUT_MULTIPLIER;
/* Leave the rest of the command zero to indicate flush everything. */
const unsigned char cmd[16] = { sdp->use_16_for_sync ?
SYNCHRONIZE_CACHE_16 : SYNCHRONIZE_CACHE };
struct scsi_sense_hdr sshdr;
struct scsi_failure failure_defs[] = {
{
.allowed = 3,
.result = SCMD_FAILURE_RESULT_ANY,
},
{}
};
struct scsi_failures failures = {
.failure_definitions = failure_defs,
};
const struct scsi_exec_args exec_args = {
.req_flags = BLK_MQ_REQ_PM,
.sshdr = &sshdr,
.failures = &failures,
};
if (!scsi_device_online(sdp))
return -ENODEV;
res = scsi_execute_cmd(sdp, cmd, REQ_OP_DRV_IN, NULL, 0, timeout,
sdkp->max_retries, &exec_args);
if (res) {
sd_print_result(sdkp, "Synchronize Cache(10) failed", res);
if (res < 0)
return res;
if (scsi_status_is_check_condition(res) &&
scsi_sense_valid(&sshdr)) {
sd_print_sense_hdr(sdkp, &sshdr);
/* we need to evaluate the error return */
if (sshdr.asc == 0x3a || /* medium not present */
sshdr.asc == 0x20 || /* invalid command */
(sshdr.asc == 0x74 && sshdr.ascq == 0x71)) /* drive is password locked */
/* this is no error here */
return 0;
/*
* This drive doesn't support sync and there's not much
* we can do because this is called during shutdown
* or suspend so just return success so those operations
* can proceed.
*/
if (sshdr.sense_key == ILLEGAL_REQUEST)
return 0;
}
switch (host_byte(res)) {
/* ignore errors due to racing a disconnection */
case DID_BAD_TARGET:
case DID_NO_CONNECT:
return 0;
/* signal the upper layer it might try again */
case DID_BUS_BUSY:
case DID_IMM_RETRY:
case DID_REQUEUE:
case DID_SOFT_ERROR:
return -EBUSY;
default:
return -EIO;
}
}
return 0;
}
static void sd_rescan(struct device *dev)
{
struct scsi_disk *sdkp = dev_get_drvdata(dev);
sd_revalidate_disk(sdkp->disk);
}
static int sd_get_unique_id(struct gendisk *disk, u8 id[16],
enum blk_unique_id type)
{
struct scsi_device *sdev = scsi_disk(disk)->device;
const struct scsi_vpd *vpd;
const unsigned char *d;
int ret = -ENXIO, len;
rcu_read_lock();
vpd = rcu_dereference(sdev->vpd_pg83);
if (!vpd)
goto out_unlock;
ret = -EINVAL;
for (d = vpd->data + 4; d < vpd->data + vpd->len; d += d[3] + 4) {
/* we only care about designators with LU association */
if (((d[1] >> 4) & 0x3) != 0x00)
continue;
if ((d[1] & 0xf) != type)
continue;
/*
* Only exit early if a 16-byte descriptor was found. Otherwise
* keep looking as one with more entropy might still show up.
*/
len = d[3];
if (len != 8 && len != 12 && len != 16)
continue;
ret = len;
memcpy(id, d + 4, len);
if (len == 16)
break;
}
out_unlock:
rcu_read_unlock();
return ret;
}
static int sd_scsi_to_pr_err(struct scsi_sense_hdr *sshdr, int result)
{
switch (host_byte(result)) {
case DID_TRANSPORT_MARGINAL:
case DID_TRANSPORT_DISRUPTED:
case DID_BUS_BUSY:
return PR_STS_RETRY_PATH_FAILURE;
case DID_NO_CONNECT:
return PR_STS_PATH_FAILED;
case DID_TRANSPORT_FAILFAST:
return PR_STS_PATH_FAST_FAILED;
}
switch (status_byte(result)) {
case SAM_STAT_RESERVATION_CONFLICT:
return PR_STS_RESERVATION_CONFLICT;
case SAM_STAT_CHECK_CONDITION:
if (!scsi_sense_valid(sshdr))
return PR_STS_IOERR;
if (sshdr->sense_key == ILLEGAL_REQUEST &&
(sshdr->asc == 0x26 || sshdr->asc == 0x24))
return -EINVAL;
fallthrough;
default:
return PR_STS_IOERR;
}
}
static int sd_pr_in_command(struct block_device *bdev, u8 sa,
unsigned char *data, int data_len)
{
struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
struct scsi_device *sdev = sdkp->device;
struct scsi_sense_hdr sshdr;
u8 cmd[10] = { PERSISTENT_RESERVE_IN, sa };
struct scsi_failure failure_defs[] = {
{
.sense = UNIT_ATTENTION,
.asc = SCMD_FAILURE_ASC_ANY,
.ascq = SCMD_FAILURE_ASCQ_ANY,
.allowed = 5,
.result = SAM_STAT_CHECK_CONDITION,
},
{}
};
struct scsi_failures failures = {
.failure_definitions = failure_defs,
};
const struct scsi_exec_args exec_args = {
.sshdr = &sshdr,
.failures = &failures,
};
int result;
put_unaligned_be16(data_len, &cmd[7]);
result = scsi_execute_cmd(sdev, cmd, REQ_OP_DRV_IN, data, data_len,
SD_TIMEOUT, sdkp->max_retries, &exec_args);
if (scsi_status_is_check_condition(result) &&
scsi_sense_valid(&sshdr)) {
sdev_printk(KERN_INFO, sdev, "PR command failed: %d\n", result);
scsi_print_sense_hdr(sdev, NULL, &sshdr);
}
if (result <= 0)
return result;
return sd_scsi_to_pr_err(&sshdr, result);
}
static int sd_pr_read_keys(struct block_device *bdev, struct pr_keys *keys_info)
{
int result, i, data_offset, num_copy_keys;
u32 num_keys = keys_info->num_keys;
int data_len = num_keys * 8 + 8;
u8 *data;
data = kzalloc(data_len, GFP_KERNEL);
if (!data)
return -ENOMEM;
result = sd_pr_in_command(bdev, READ_KEYS, data, data_len);
if (result)
goto free_data;
keys_info->generation = get_unaligned_be32(&data[0]);
keys_info->num_keys = get_unaligned_be32(&data[4]) / 8;
data_offset = 8;
num_copy_keys = min(num_keys, keys_info->num_keys);
for (i = 0; i < num_copy_keys; i++) {
keys_info->keys[i] = get_unaligned_be64(&data[data_offset]);
data_offset += 8;
}
free_data:
kfree(data);
return result;
}
static int sd_pr_read_reservation(struct block_device *bdev,
struct pr_held_reservation *rsv)
{
struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
struct scsi_device *sdev = sdkp->device;
u8 data[24] = { };
int result, len;
result = sd_pr_in_command(bdev, READ_RESERVATION, data, sizeof(data));
if (result)
return result;
len = get_unaligned_be32(&data[4]);
if (!len)
return 0;
/* Make sure we have at least the key and type */
if (len < 14) {
sdev_printk(KERN_INFO, sdev,
"READ RESERVATION failed due to short return buffer of %d bytes\n",
len);
return -EINVAL;
}
rsv->generation = get_unaligned_be32(&data[0]);
rsv->key = get_unaligned_be64(&data[8]);
rsv->type = scsi_pr_type_to_block(data[21] & 0x0f);
return 0;
}
static int sd_pr_out_command(struct block_device *bdev, u8 sa, u64 key,
u64 sa_key, enum scsi_pr_type type, u8 flags)
{
struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
struct scsi_device *sdev = sdkp->device;
struct scsi_sense_hdr sshdr;
struct scsi_failure failure_defs[] = {
{
.sense = UNIT_ATTENTION,
.asc = SCMD_FAILURE_ASC_ANY,
.ascq = SCMD_FAILURE_ASCQ_ANY,
.allowed = 5,
.result = SAM_STAT_CHECK_CONDITION,
},
{}
};
struct scsi_failures failures = {
.failure_definitions = failure_defs,
};
const struct scsi_exec_args exec_args = {
.sshdr = &sshdr,
.failures = &failures,
};
int result;
u8 cmd[16] = { 0, };
u8 data[24] = { 0, };
cmd[0] = PERSISTENT_RESERVE_OUT;
cmd[1] = sa;
cmd[2] = type;
put_unaligned_be32(sizeof(data), &cmd[5]);
put_unaligned_be64(key, &data[0]);
put_unaligned_be64(sa_key, &data[8]);
data[20] = flags;
result = scsi_execute_cmd(sdev, cmd, REQ_OP_DRV_OUT, &data,
sizeof(data), SD_TIMEOUT, sdkp->max_retries,
&exec_args);
if (scsi_status_is_check_condition(result) &&
scsi_sense_valid(&sshdr)) {
sdev_printk(KERN_INFO, sdev, "PR command failed: %d\n", result);
scsi_print_sense_hdr(sdev, NULL, &sshdr);
}
if (result <= 0)
return result;
return sd_scsi_to_pr_err(&sshdr, result);
}
static int sd_pr_register(struct block_device *bdev, u64 old_key, u64 new_key,
u32 flags)
{
if (flags & ~PR_FL_IGNORE_KEY)
return -EOPNOTSUPP;
return sd_pr_out_command(bdev, (flags & PR_FL_IGNORE_KEY) ? 0x06 : 0x00,
old_key, new_key, 0,
(1 << 0) /* APTPL */);
}
static int sd_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type,
u32 flags)
{
if (flags)
return -EOPNOTSUPP;
return sd_pr_out_command(bdev, 0x01, key, 0,
block_pr_type_to_scsi(type), 0);
}
static int sd_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
{
return sd_pr_out_command(bdev, 0x02, key, 0,
block_pr_type_to_scsi(type), 0);
}
static int sd_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key,
enum pr_type type, bool abort)
{
return sd_pr_out_command(bdev, abort ? 0x05 : 0x04, old_key, new_key,
block_pr_type_to_scsi(type), 0);
}
static int sd_pr_clear(struct block_device *bdev, u64 key)
{
return sd_pr_out_command(bdev, 0x03, key, 0, 0, 0);
}
static const struct pr_ops sd_pr_ops = {
.pr_register = sd_pr_register,
.pr_reserve = sd_pr_reserve,
.pr_release = sd_pr_release,
.pr_preempt = sd_pr_preempt,
.pr_clear = sd_pr_clear,
.pr_read_keys = sd_pr_read_keys,
.pr_read_reservation = sd_pr_read_reservation,
};
static void scsi_disk_free_disk(struct gendisk *disk)
{
struct scsi_disk *sdkp = scsi_disk(disk);
put_device(&sdkp->disk_dev);
}
static const struct block_device_operations sd_fops = {
.owner = THIS_MODULE,
.open = sd_open,
.release = sd_release,
.ioctl = sd_ioctl,
.getgeo = sd_getgeo,
.compat_ioctl = blkdev_compat_ptr_ioctl,
.check_events = sd_check_events,
.unlock_native_capacity = sd_unlock_native_capacity,
.report_zones = sd_zbc_report_zones,
.get_unique_id = sd_get_unique_id,
.free_disk = scsi_disk_free_disk,
.pr_ops = &sd_pr_ops,
};
/**
* sd_eh_reset - reset error handling callback
* @scmd: sd-issued command that has failed
*
* This function is called by the SCSI midlayer before starting
* SCSI EH. When counting medium access failures we have to be
* careful to register it only only once per device and SCSI EH run;
* there might be several timed out commands which will cause the
* 'max_medium_access_timeouts' counter to trigger after the first
* SCSI EH run already and set the device to offline.
* So this function resets the internal counter before starting SCSI EH.
**/
static void sd_eh_reset(struct scsi_cmnd *scmd)
{
struct scsi_disk *sdkp = scsi_disk(scsi_cmd_to_rq(scmd)->q->disk);
/* New SCSI EH run, reset gate variable */
sdkp->ignore_medium_access_errors = false;
}
/**
* sd_eh_action - error handling callback
* @scmd: sd-issued command that has failed
* @eh_disp: The recovery disposition suggested by the midlayer
*
* This function is called by the SCSI midlayer upon completion of an
* error test command (currently TEST UNIT READY). The result of sending
* the eh command is passed in eh_disp. We're looking for devices that
* fail medium access commands but are OK with non access commands like
* test unit ready (so wrongly see the device as having a successful
* recovery)
**/
static int sd_eh_action(struct scsi_cmnd *scmd, int eh_disp)
{
struct scsi_disk *sdkp = scsi_disk(scsi_cmd_to_rq(scmd)->q->disk);
struct scsi_device *sdev = scmd->device;
if (!scsi_device_online(sdev) ||
!scsi_medium_access_command(scmd) ||
host_byte(scmd->result) != DID_TIME_OUT ||
eh_disp != SUCCESS)
return eh_disp;
/*
* The device has timed out executing a medium access command.
* However, the TEST UNIT READY command sent during error
* handling completed successfully. Either the device is in the
* process of recovering or has it suffered an internal failure
* that prevents access to the storage medium.
*/
if (!sdkp->ignore_medium_access_errors) {
sdkp->medium_access_timed_out++;
sdkp->ignore_medium_access_errors = true;
}
/*
* If the device keeps failing read/write commands but TEST UNIT
* READY always completes successfully we assume that medium
* access is no longer possible and take the device offline.
*/
if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
scmd_printk(KERN_ERR, scmd,
"Medium access timeout failure. Offlining disk!\n");
mutex_lock(&sdev->state_mutex);
scsi_device_set_state(sdev, SDEV_OFFLINE);
mutex_unlock(&sdev->state_mutex);
return SUCCESS;
}
return eh_disp;
}
static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
{
struct request *req = scsi_cmd_to_rq(scmd);
struct scsi_device *sdev = scmd->device;
unsigned int transferred, good_bytes;
u64 start_lba, end_lba, bad_lba;
/*
* Some commands have a payload smaller than the device logical
* block size (e.g. INQUIRY on a 4K disk).
*/
if (scsi_bufflen(scmd) <= sdev->sector_size)
return 0;
/* Check if we have a 'bad_lba' information */
if (!scsi_get_sense_info_fld(scmd->sense_buffer,
SCSI_SENSE_BUFFERSIZE,
&bad_lba))
return 0;
/*
* If the bad lba was reported incorrectly, we have no idea where
* the error is.
*/
start_lba = sectors_to_logical(sdev, blk_rq_pos(req));
end_lba = start_lba + bytes_to_logical(sdev, scsi_bufflen(scmd));
if (bad_lba < start_lba || bad_lba >= end_lba)
return 0;
/*
* resid is optional but mostly filled in. When it's unused,
* its value is zero, so we assume the whole buffer transferred
*/
transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
/* This computation should always be done in terms of the
* resolution of the device's medium.
*/
good_bytes = logical_to_bytes(sdev, bad_lba - start_lba);
return min(good_bytes, transferred);
}
/**
* sd_done - bottom half handler: called when the lower level
* driver has completed (successfully or otherwise) a scsi command.
* @SCpnt: mid-level's per command structure.
*
* Note: potentially run from within an ISR. Must not block.
**/
static int sd_done(struct scsi_cmnd *SCpnt)
{
int result = SCpnt->result;
unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
unsigned int sector_size = SCpnt->device->sector_size;
unsigned int resid;
struct scsi_sense_hdr sshdr;
struct request *req = scsi_cmd_to_rq(SCpnt);
struct scsi_disk *sdkp = scsi_disk(req->q->disk);
int sense_valid = 0;
int sense_deferred = 0;
switch (req_op(req)) {
case REQ_OP_DISCARD:
case REQ_OP_WRITE_ZEROES:
case REQ_OP_ZONE_RESET:
case REQ_OP_ZONE_RESET_ALL:
case REQ_OP_ZONE_OPEN:
case REQ_OP_ZONE_CLOSE:
case REQ_OP_ZONE_FINISH:
if (!result) {
good_bytes = blk_rq_bytes(req);
scsi_set_resid(SCpnt, 0);
} else {
good_bytes = 0;
scsi_set_resid(SCpnt, blk_rq_bytes(req));
}
break;
default:
/*
* In case of bogus fw or device, we could end up having
* an unaligned partial completion. Check this here and force
* alignment.
*/
resid = scsi_get_resid(SCpnt);
if (resid & (sector_size - 1)) {
sd_printk(KERN_INFO, sdkp,
"Unaligned partial completion (resid=%u, sector_sz=%u)\n",
resid, sector_size);
scsi_print_command(SCpnt);
resid = min(scsi_bufflen(SCpnt),
round_up(resid, sector_size));
scsi_set_resid(SCpnt, resid);
}
}
if (result) {
sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
if (sense_valid)
sense_deferred = scsi_sense_is_deferred(&sshdr);
}
sdkp->medium_access_timed_out = 0;
if (!scsi_status_is_check_condition(result) &&
(!sense_valid || sense_deferred))
goto out;
switch (sshdr.sense_key) {
case HARDWARE_ERROR:
case MEDIUM_ERROR:
good_bytes = sd_completed_bytes(SCpnt);
break;
case RECOVERED_ERROR:
good_bytes = scsi_bufflen(SCpnt);
break;
case NO_SENSE:
/* This indicates a false check condition, so ignore it. An
* unknown amount of data was transferred so treat it as an
* error.
*/
SCpnt->result = 0;
memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
break;
case ABORTED_COMMAND:
if (sshdr.asc == 0x10) /* DIF: Target detected corruption */
good_bytes = sd_completed_bytes(SCpnt);
break;
case ILLEGAL_REQUEST:
switch (sshdr.asc) {
case 0x10: /* DIX: Host detected corruption */
good_bytes = sd_completed_bytes(SCpnt);
break;
case 0x20: /* INVALID COMMAND OPCODE */
case 0x24: /* INVALID FIELD IN CDB */
switch (SCpnt->cmnd[0]) {
case UNMAP:
sd_config_discard(sdkp, SD_LBP_DISABLE);
break;
case WRITE_SAME_16:
case WRITE_SAME:
if (SCpnt->cmnd[1] & 8) { /* UNMAP */
sd_config_discard(sdkp, SD_LBP_DISABLE);
} else {
sdkp->device->no_write_same = 1;
sd_config_write_same(sdkp);
req->rq_flags |= RQF_QUIET;
}
break;
}
}
break;
default:
break;
}
out:
if (sd_is_zoned(sdkp))
good_bytes = sd_zbc_complete(SCpnt, good_bytes, &sshdr);
SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
"sd_done: completed %d of %d bytes\n",
good_bytes, scsi_bufflen(SCpnt)));
return good_bytes;
}
/*
* spinup disk - called only in sd_revalidate_disk()
*/
static void
sd_spinup_disk(struct scsi_disk *sdkp)
{
static const u8 cmd[10] = { TEST_UNIT_READY };
unsigned long spintime_expire = 0;
int spintime, sense_valid = 0;
unsigned int the_result;
struct scsi_sense_hdr sshdr;
struct scsi_failure failure_defs[] = {
/* Do not retry Medium Not Present */
{
.sense = UNIT_ATTENTION,
.asc = 0x3A,
.ascq = SCMD_FAILURE_ASCQ_ANY,
.result = SAM_STAT_CHECK_CONDITION,
},
{
.sense = NOT_READY,
.asc = 0x3A,
.ascq = SCMD_FAILURE_ASCQ_ANY,
.result = SAM_STAT_CHECK_CONDITION,
},
/* Retry when scsi_status_is_good would return false 3 times */
{
.result = SCMD_FAILURE_STAT_ANY,
.allowed = 3,
},
{}
};
struct scsi_failures failures = {
.failure_definitions = failure_defs,
};
const struct scsi_exec_args exec_args = {
.sshdr = &sshdr,
.failures = &failures,
};
spintime = 0;
/* Spin up drives, as required. Only do this at boot time */
/* Spinup needs to be done for module loads too. */
do {
bool media_was_present = sdkp->media_present;
scsi_failures_reset_retries(&failures);
the_result = scsi_execute_cmd(sdkp->device, cmd, REQ_OP_DRV_IN,
NULL, 0, SD_TIMEOUT,
sdkp->max_retries, &exec_args);
if (the_result > 0) {
/*
* If the drive has indicated to us that it doesn't
* have any media in it, don't bother with any more
* polling.
*/
if (media_not_present(sdkp, &sshdr)) {
if (media_was_present)
sd_printk(KERN_NOTICE, sdkp,
"Media removed, stopped polling\n");
return;
}
sense_valid = scsi_sense_valid(&sshdr);
}
if (!scsi_status_is_check_condition(the_result)) {
/* no sense, TUR either succeeded or failed
* with a status error */
if(!spintime && !scsi_status_is_good(the_result)) {
sd_print_result(sdkp, "Test Unit Ready failed",
the_result);
}
break;
}
/*
* The device does not want the automatic start to be issued.
*/
if (sdkp->device->no_start_on_add)
break;
if (sense_valid && sshdr.sense_key == NOT_READY) {
if (sshdr.asc == 4 && sshdr.ascq == 3)
break; /* manual intervention required */
if (sshdr.asc == 4 && sshdr.ascq == 0xb)
break; /* standby */
if (sshdr.asc == 4 && sshdr.ascq == 0xc)
break; /* unavailable */
if (sshdr.asc == 4 && sshdr.ascq == 0x1b)
break; /* sanitize in progress */
if (sshdr.asc == 4 && sshdr.ascq == 0x24)
break; /* depopulation in progress */
if (sshdr.asc == 4 && sshdr.ascq == 0x25)
break; /* depopulation restoration in progress */
/*
* Issue command to spin up drive when not ready
*/
if (!spintime) {
/* Return immediately and start spin cycle */
const u8 start_cmd[10] = {
[0] = START_STOP,
[1] = 1,
[4] = sdkp->device->start_stop_pwr_cond ?
0x11 : 1,
};
sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
scsi_execute_cmd(sdkp->device, start_cmd,
REQ_OP_DRV_IN, NULL, 0,
SD_TIMEOUT, sdkp->max_retries,
&exec_args);
spintime_expire = jiffies + 100 * HZ;
spintime = 1;
}
/* Wait 1 second for next try */
msleep(1000);
printk(KERN_CONT ".");
/*
* Wait for USB flash devices with slow firmware.
* Yes, this sense key/ASC combination shouldn't
* occur here. It's characteristic of these devices.
*/
} else if (sense_valid &&
sshdr.sense_key == UNIT_ATTENTION &&
sshdr.asc == 0x28) {
if (!spintime) {
spintime_expire = jiffies + 5 * HZ;
spintime = 1;
}
/* Wait 1 second for next try */
msleep(1000);
} else {
/* we don't understand the sense code, so it's
* probably pointless to loop */
if(!spintime) {
sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
sd_print_sense_hdr(sdkp, &sshdr);
}
break;
}
} while (spintime && time_before_eq(jiffies, spintime_expire));
if (spintime) {
if (scsi_status_is_good(the_result))
printk(KERN_CONT "ready\n");
else
printk(KERN_CONT "not responding...\n");
}
}
/*
* Determine whether disk supports Data Integrity Field.
*/
static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
{
struct scsi_device *sdp = sdkp->device;
u8 type;
if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0) {
sdkp->protection_type = 0;
return 0;
}
type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
if (type > T10_PI_TYPE3_PROTECTION) {
sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
" protection type %u. Disabling disk!\n",
type);
sdkp->protection_type = 0;
return -ENODEV;
}
sdkp->protection_type = type;
return 0;
}
static void sd_config_protection(struct scsi_disk *sdkp)
{
struct scsi_device *sdp = sdkp->device;
sd_dif_config_host(sdkp);
if (!sdkp->protection_type)
return;
if (!scsi_host_dif_capable(sdp->host, sdkp->protection_type)) {
sd_first_printk(KERN_NOTICE, sdkp,
"Disabling DIF Type %u protection\n",
sdkp->protection_type);
sdkp->protection_type = 0;
}
sd_first_printk(KERN_NOTICE, sdkp, "Enabling DIF Type %u protection\n",
sdkp->protection_type);
}
static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
struct scsi_sense_hdr *sshdr, int sense_valid,
int the_result)
{
if (sense_valid)
sd_print_sense_hdr(sdkp, sshdr);
else
sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
/*
* Set dirty bit for removable devices if not ready -
* sometimes drives will not report this properly.
*/
if (sdp->removable &&
sense_valid && sshdr->sense_key == NOT_READY)
set_media_not_present(sdkp);
/*
* We used to set media_present to 0 here to indicate no media
* in the drive, but some drives fail read capacity even with
* media present, so we can't do that.
*/
sdkp->capacity = 0; /* unknown mapped to zero - as usual */
}
#define RC16_LEN 32
#if RC16_LEN > SD_BUF_SIZE
#error RC16_LEN must not be more than SD_BUF_SIZE
#endif
#define READ_CAPACITY_RETRIES_ON_RESET 10
static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
unsigned char *buffer)
{
unsigned char cmd[16];
struct scsi_sense_hdr sshdr;
const struct scsi_exec_args exec_args = {
.sshdr = &sshdr,
};
int sense_valid = 0;
int the_result;
int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
unsigned int alignment;
unsigned long long lba;
unsigned sector_size;
if (sdp->no_read_capacity_16)
return -EINVAL;
do {
memset(cmd, 0, 16);
cmd[0] = SERVICE_ACTION_IN_16;
cmd[1] = SAI_READ_CAPACITY_16;
cmd[13] = RC16_LEN;
memset(buffer, 0, RC16_LEN);
the_result = scsi_execute_cmd(sdp, cmd, REQ_OP_DRV_IN,
buffer, RC16_LEN, SD_TIMEOUT,
sdkp->max_retries, &exec_args);
if (the_result > 0) {
if (media_not_present(sdkp, &sshdr))
return -ENODEV;
sense_valid = scsi_sense_valid(&sshdr);
if (sense_valid &&
sshdr.sense_key == ILLEGAL_REQUEST &&
(sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
sshdr.ascq == 0x00)
/* Invalid Command Operation Code or
* Invalid Field in CDB, just retry
* silently with RC10 */
return -EINVAL;
if (sense_valid &&
sshdr.sense_key == UNIT_ATTENTION &&
sshdr.asc == 0x29 && sshdr.ascq == 0x00)
/* Device reset might occur several times,
* give it one more chance */
if (--reset_retries > 0)
continue;
}
retries--;
} while (the_result && retries);
if (the_result) {
sd_print_result(sdkp, "Read Capacity(16) failed", the_result);
read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
return -EINVAL;
}
sector_size = get_unaligned_be32(&buffer[8]);
lba = get_unaligned_be64(&buffer[0]);
if (sd_read_protection_type(sdkp, buffer) < 0) {
sdkp->capacity = 0;
return -ENODEV;
}
/* Logical blocks per physical block exponent */
sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
/* RC basis */
sdkp->rc_basis = (buffer[12] >> 4) & 0x3;
/* Lowest aligned logical block */
alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
blk_queue_alignment_offset(sdp->request_queue, alignment);
if (alignment && sdkp->first_scan)
sd_printk(KERN_NOTICE, sdkp,
"physical block alignment offset: %u\n", alignment);
if (buffer[14] & 0x80) { /* LBPME */
sdkp->lbpme = 1;
if (buffer[14] & 0x40) /* LBPRZ */
sdkp->lbprz = 1;
sd_config_discard(sdkp, SD_LBP_WS16);
}
sdkp->capacity = lba + 1;
return sector_size;
}
static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
unsigned char *buffer)
{
static const u8 cmd[10] = { READ_CAPACITY };
struct scsi_sense_hdr sshdr;
struct scsi_failure failure_defs[] = {
/* Do not retry Medium Not Present */
{
.sense = UNIT_ATTENTION,
.asc = 0x3A,
.result = SAM_STAT_CHECK_CONDITION,
},
{
.sense = NOT_READY,
.asc = 0x3A,
.result = SAM_STAT_CHECK_CONDITION,
},
/* Device reset might occur several times so retry a lot */
{
.sense = UNIT_ATTENTION,
.asc = 0x29,
.allowed = READ_CAPACITY_RETRIES_ON_RESET,
.result = SAM_STAT_CHECK_CONDITION,
},
/* Any other error not listed above retry 3 times */
{
.result = SCMD_FAILURE_RESULT_ANY,
.allowed = 3,
},
{}
};
struct scsi_failures failures = {
.failure_definitions = failure_defs,
};
const struct scsi_exec_args exec_args = {
.sshdr = &sshdr,
.failures = &failures,
};
int sense_valid = 0;
int the_result;
sector_t lba;
unsigned sector_size;
memset(buffer, 0, 8);
the_result = scsi_execute_cmd(sdp, cmd, REQ_OP_DRV_IN, buffer,
8, SD_TIMEOUT, sdkp->max_retries,
&exec_args);
if (the_result > 0) {
sense_valid = scsi_sense_valid(&sshdr);
if (media_not_present(sdkp, &sshdr))
return -ENODEV;
}
if (the_result) {
sd_print_result(sdkp, "Read Capacity(10) failed", the_result);
read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
return -EINVAL;
}
sector_size = get_unaligned_be32(&buffer[4]);
lba = get_unaligned_be32(&buffer[0]);
if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
/* Some buggy (usb cardreader) devices return an lba of
0xffffffff when the want to report a size of 0 (with
which they really mean no media is present) */
sdkp->capacity = 0;
sdkp->physical_block_size = sector_size;
return sector_size;
}
sdkp->capacity = lba + 1;
sdkp->physical_block_size = sector_size;
return sector_size;
}
static int sd_try_rc16_first(struct scsi_device *sdp)
{
if (sdp->host->max_cmd_len < 16)
return 0;
if (sdp->try_rc_10_first)
return 0;
if (sdp->scsi_level > SCSI_SPC_2)
return 1;
if (scsi_device_protection(sdp))
return 1;
return 0;
}
/*
* read disk capacity
*/
static void
sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
{
int sector_size;
struct scsi_device *sdp = sdkp->device;
if (sd_try_rc16_first(sdp)) {
sector_size = read_capacity_16(sdkp, sdp, buffer);
if (sector_size == -EOVERFLOW)
goto got_data;
if (sector_size == -ENODEV)
return;
if (sector_size < 0)
sector_size = read_capacity_10(sdkp, sdp, buffer);
if (sector_size < 0)
return;
} else {
sector_size = read_capacity_10(sdkp, sdp, buffer);
if (sector_size == -EOVERFLOW)
goto got_data;
if (sector_size < 0)
return;
if ((sizeof(sdkp->capacity) > 4) &&
(sdkp->capacity > 0xffffffffULL)) {
int old_sector_size = sector_size;
sd_printk(KERN_NOTICE, sdkp, "Very big device. "
"Trying to use READ CAPACITY(16).\n");
sector_size = read_capacity_16(sdkp, sdp, buffer);
if (sector_size < 0) {
sd_printk(KERN_NOTICE, sdkp,
"Using 0xffffffff as device size\n");
sdkp->capacity = 1 + (sector_t) 0xffffffff;
sector_size = old_sector_size;
goto got_data;
}
/* Remember that READ CAPACITY(16) succeeded */
sdp->try_rc_10_first = 0;
}
}
/* Some devices are known to return the total number of blocks,
* not the highest block number. Some devices have versions
* which do this and others which do not. Some devices we might
* suspect of doing this but we don't know for certain.
*
* If we know the reported capacity is wrong, decrement it. If
* we can only guess, then assume the number of blocks is even
* (usually true but not always) and err on the side of lowering
* the capacity.
*/
if (sdp->fix_capacity ||
(sdp->guess_capacity && (sdkp->capacity & 0x01))) {
sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
"from its reported value: %llu\n",
(unsigned long long) sdkp->capacity);
--sdkp->capacity;
}
got_data:
if (sector_size == 0) {
sector_size = 512;
sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
"assuming 512.\n");
}
if (sector_size != 512 &&
sector_size != 1024 &&
sector_size != 2048 &&
sector_size != 4096) {
sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
sector_size);
/*
* The user might want to re-format the drive with
* a supported sectorsize. Once this happens, it
* would be relatively trivial to set the thing up.
* For this reason, we leave the thing in the table.
*/
sdkp->capacity = 0;
/*
* set a bogus sector size so the normal read/write
* logic in the block layer will eventually refuse any
* request on this device without tripping over power
* of two sector size assumptions
*/
sector_size = 512;
}
blk_queue_logical_block_size(sdp->request_queue, sector_size);
blk_queue_physical_block_size(sdp->request_queue,
sdkp->physical_block_size);
sdkp->device->sector_size = sector_size;
if (sdkp->capacity > 0xffffffff)
sdp->use_16_for_rw = 1;
}
/*
* Print disk capacity
*/
static void
sd_print_capacity(struct scsi_disk *sdkp,
sector_t old_capacity)
{
int sector_size = sdkp->device->sector_size;
char cap_str_2[10], cap_str_10[10];
if (!sdkp->first_scan && old_capacity == sdkp->capacity)
return;
string_get_size(sdkp->capacity, sector_size,
STRING_UNITS_2, cap_str_2, sizeof(cap_str_2));
string_get_size(sdkp->capacity, sector_size,
STRING_UNITS_10, cap_str_10, sizeof(cap_str_10));
sd_printk(KERN_NOTICE, sdkp,
"%llu %d-byte logical blocks: (%s/%s)\n",
(unsigned long long)sdkp->capacity,
sector_size, cap_str_10, cap_str_2);
if (sdkp->physical_block_size != sector_size)
sd_printk(KERN_NOTICE, sdkp,
"%u-byte physical blocks\n",
sdkp->physical_block_size);
}
/* called with buffer of length 512 */
static inline int
sd_do_mode_sense(struct scsi_disk *sdkp, int dbd, int modepage,
unsigned char *buffer, int len, struct scsi_mode_data *data,
struct scsi_sense_hdr *sshdr)
{
/*
* If we must use MODE SENSE(10), make sure that the buffer length
* is at least 8 bytes so that the mode sense header fits.
*/
if (sdkp->device->use_10_for_ms && len < 8)
len = 8;
return scsi_mode_sense(sdkp->device, dbd, modepage, 0, buffer, len,
SD_TIMEOUT, sdkp->max_retries, data, sshdr);
}
/*
* read write protect setting, if possible - called only in sd_revalidate_disk()
* called with buffer of length SD_BUF_SIZE
*/
static void
sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
{
int res;
struct scsi_device *sdp = sdkp->device;
struct scsi_mode_data data;
int old_wp = sdkp->write_prot;
set_disk_ro(sdkp->disk, 0);
if (sdp->skip_ms_page_3f) {
sd_first_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
return;
}
if (sdp->use_192_bytes_for_3f) {
res = sd_do_mode_sense(sdkp, 0, 0x3F, buffer, 192, &data, NULL);
} else {
/*
* First attempt: ask for all pages (0x3F), but only 4 bytes.
* We have to start carefully: some devices hang if we ask
* for more than is available.
*/
res = sd_do_mode_sense(sdkp, 0, 0x3F, buffer, 4, &data, NULL);
/*
* Second attempt: ask for page 0 When only page 0 is
* implemented, a request for page 3F may return Sense Key
* 5: Illegal Request, Sense Code 24: Invalid field in
* CDB.
*/
if (res < 0)
res = sd_do_mode_sense(sdkp, 0, 0, buffer, 4, &data, NULL);
/*
* Third attempt: ask 255 bytes, as we did earlier.
*/
if (res < 0)
res = sd_do_mode_sense(sdkp, 0, 0x3F, buffer, 255,
&data, NULL);
}
if (res < 0) {
sd_first_printk(KERN_WARNING, sdkp,
"Test WP failed, assume Write Enabled\n");
} else {
sdkp->write_prot = ((data.device_specific & 0x80) != 0);
set_disk_ro(sdkp->disk, sdkp->write_prot);
if (sdkp->first_scan || old_wp != sdkp->write_prot) {
sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
sdkp->write_prot ? "on" : "off");
sd_printk(KERN_DEBUG, sdkp, "Mode Sense: %4ph\n", buffer);
}
}
}
/*
* sd_read_cache_type - called only from sd_revalidate_disk()
* called with buffer of length SD_BUF_SIZE
*/
static void
sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
{
int len = 0, res;
struct scsi_device *sdp = sdkp->device;
int dbd;
int modepage;
int first_len;
struct scsi_mode_data data;
struct scsi_sense_hdr sshdr;
int old_wce = sdkp->WCE;
int old_rcd = sdkp->RCD;
int old_dpofua = sdkp->DPOFUA;
if (sdkp->cache_override)
return;
first_len = 4;
if (sdp->skip_ms_page_8) {
if (sdp->type == TYPE_RBC)
goto defaults;
else {
if (sdp->skip_ms_page_3f)
goto defaults;
modepage = 0x3F;
if (sdp->use_192_bytes_for_3f)
first_len = 192;
dbd = 0;
}
} else if (sdp->type == TYPE_RBC) {
modepage = 6;
dbd = 8;
} else {
modepage = 8;
dbd = 0;
}
/* cautiously ask */
res = sd_do_mode_sense(sdkp, dbd, modepage, buffer, first_len,
&data, &sshdr);
if (res < 0)
goto bad_sense;
if (!data.header_length) {
modepage = 6;
first_len = 0;
sd_first_printk(KERN_ERR, sdkp,
"Missing header in MODE_SENSE response\n");
}
/* that went OK, now ask for the proper length */
len = data.length;
/*
* We're only interested in the first three bytes, actually.
* But the data cache page is defined for the first 20.
*/
if (len < 3)
goto bad_sense;
else if (len > SD_BUF_SIZE) {
sd_first_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
"data from %d to %d bytes\n", len, SD_BUF_SIZE);
len = SD_BUF_SIZE;
}
if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
len = 192;
/* Get the data */
if (len > first_len)
res = sd_do_mode_sense(sdkp, dbd, modepage, buffer, len,
&data, &sshdr);
if (!res) {
int offset = data.header_length + data.block_descriptor_length;
while (offset < len) {
u8 page_code = buffer[offset] & 0x3F;
u8 spf = buffer[offset] & 0x40;
if (page_code == 8 || page_code == 6) {
/* We're interested only in the first 3 bytes.
*/
if (len - offset <= 2) {
sd_first_printk(KERN_ERR, sdkp,
"Incomplete mode parameter "
"data\n");
goto defaults;
} else {
modepage = page_code;
goto Page_found;
}
} else {
/* Go to the next page */
if (spf && len - offset > 3)
offset += 4 + (buffer[offset+2] << 8) +
buffer[offset+3];
else if (!spf && len - offset > 1)
offset += 2 + buffer[offset+1];
else {
sd_first_printk(KERN_ERR, sdkp,
"Incomplete mode "
"parameter data\n");
goto defaults;
}
}
}
sd_first_printk(KERN_WARNING, sdkp,
"No Caching mode page found\n");
goto defaults;
Page_found:
if (modepage == 8) {
sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
} else {
sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
sdkp->RCD = 0;
}
sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
if (sdp->broken_fua) {
sd_first_printk(KERN_NOTICE, sdkp, "Disabling FUA\n");
sdkp->DPOFUA = 0;
} else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw &&
!sdkp->device->use_16_for_rw) {
sd_first_printk(KERN_NOTICE, sdkp,
"Uses READ/WRITE(6), disabling FUA\n");
sdkp->DPOFUA = 0;
}
/* No cache flush allowed for write protected devices */
if (sdkp->WCE && sdkp->write_prot)
sdkp->WCE = 0;
if (sdkp->first_scan || old_wce != sdkp->WCE ||
old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
sd_printk(KERN_NOTICE, sdkp,
"Write cache: %s, read cache: %s, %s\n",
sdkp->WCE ? "enabled" : "disabled",
sdkp->RCD ? "disabled" : "enabled",
sdkp->DPOFUA ? "supports DPO and FUA"
: "doesn't support DPO or FUA");
return;
}
bad_sense:
if (res == -EIO && scsi_sense_valid(&sshdr) &&
sshdr.sense_key == ILLEGAL_REQUEST &&
sshdr.asc == 0x24 && sshdr.ascq == 0x0)
/* Invalid field in CDB */
sd_first_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
else
sd_first_printk(KERN_ERR, sdkp,
"Asking for cache data failed\n");
defaults:
if (sdp->wce_default_on) {
sd_first_printk(KERN_NOTICE, sdkp,
"Assuming drive cache: write back\n");
sdkp->WCE = 1;
} else {
sd_first_printk(KERN_WARNING, sdkp,
"Assuming drive cache: write through\n");
sdkp->WCE = 0;
}
sdkp->RCD = 0;
sdkp->DPOFUA = 0;
}
static bool sd_is_perm_stream(struct scsi_disk *sdkp, unsigned int stream_id)
{
u8 cdb[16] = { SERVICE_ACTION_IN_16, SAI_GET_STREAM_STATUS };
struct {
struct scsi_stream_status_header h;
struct scsi_stream_status s;
} buf;
struct scsi_device *sdev = sdkp->device;
struct scsi_sense_hdr sshdr;
const struct scsi_exec_args exec_args = {
.sshdr = &sshdr,
};
int res;
put_unaligned_be16(stream_id, &cdb[4]);
put_unaligned_be32(sizeof(buf), &cdb[10]);
res = scsi_execute_cmd(sdev, cdb, REQ_OP_DRV_IN, &buf, sizeof(buf),
SD_TIMEOUT, sdkp->max_retries, &exec_args);
if (res < 0)
return false;
if (scsi_status_is_check_condition(res) && scsi_sense_valid(&sshdr))
sd_print_sense_hdr(sdkp, &sshdr);
if (res)
return false;
if (get_unaligned_be32(&buf.h.len) < sizeof(struct scsi_stream_status))
return false;
return buf.h.stream_status[0].perm;
}
static void sd_read_io_hints(struct scsi_disk *sdkp, unsigned char *buffer)
{
struct scsi_device *sdp = sdkp->device;
const struct scsi_io_group_descriptor *desc, *start, *end;
struct scsi_sense_hdr sshdr;
struct scsi_mode_data data;
int res;
res = scsi_mode_sense(sdp, /*dbd=*/0x8, /*modepage=*/0x0a,
/*subpage=*/0x05, buffer, SD_BUF_SIZE, SD_TIMEOUT,
sdkp->max_retries, &data, &sshdr);
if (res < 0)
return;
start = (void *)buffer + data.header_length + 16;
end = (void *)buffer + ALIGN_DOWN(data.header_length + data.length,
sizeof(*end));
/*
* From "SBC-5 Constrained Streams with Data Lifetimes": Device severs
* should assign the lowest numbered stream identifiers to permanent
* streams.
*/
for (desc = start; desc < end; desc++)
if (!desc->st_enble || !sd_is_perm_stream(sdkp, desc - start))
break;
sdkp->permanent_stream_count = desc - start;
if (sdkp->rscs && sdkp->permanent_stream_count < 2)
sd_printk(KERN_INFO, sdkp,
"Unexpected: RSCS has been set and the permanent stream count is %u\n",
sdkp->permanent_stream_count);
else if (sdkp->permanent_stream_count)
sd_printk(KERN_INFO, sdkp, "permanent stream count = %d\n",
sdkp->permanent_stream_count);
}
/*
* The ATO bit indicates whether the DIF application tag is available
* for use by the operating system.
*/
static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
{
int res, offset;
struct scsi_device *sdp = sdkp->device;
struct scsi_mode_data data;
struct scsi_sense_hdr sshdr;
if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
return;
if (sdkp->protection_type == 0)
return;
res = scsi_mode_sense(sdp, 1, 0x0a, 0, buffer, 36, SD_TIMEOUT,
sdkp->max_retries, &data, &sshdr);
if (res < 0 || !data.header_length ||
data.length < 6) {
sd_first_printk(KERN_WARNING, sdkp,
"getting Control mode page failed, assume no ATO\n");
if (res == -EIO && scsi_sense_valid(&sshdr))
sd_print_sense_hdr(sdkp, &sshdr);
return;
}
offset = data.header_length + data.block_descriptor_length;
if ((buffer[offset] & 0x3f) != 0x0a) {
sd_first_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
return;
}
if ((buffer[offset + 5] & 0x80) == 0)
return;
sdkp->ATO = 1;
return;
}
/**
* sd_read_block_limits - Query disk device for preferred I/O sizes.
* @sdkp: disk to query
*/
static void sd_read_block_limits(struct scsi_disk *sdkp)
{
struct scsi_vpd *vpd;
rcu_read_lock();
vpd = rcu_dereference(sdkp->device->vpd_pgb0);
if (!vpd || vpd->len < 16)
goto out;
sdkp->min_xfer_blocks = get_unaligned_be16(&vpd->data[6]);
sdkp->max_xfer_blocks = get_unaligned_be32(&vpd->data[8]);
sdkp->opt_xfer_blocks = get_unaligned_be32(&vpd->data[12]);
if (vpd->len >= 64) {
unsigned int lba_count, desc_count;
sdkp->max_ws_blocks = (u32)get_unaligned_be64(&vpd->data[36]);
if (!sdkp->lbpme)
goto out;
lba_count = get_unaligned_be32(&vpd->data[20]);
desc_count = get_unaligned_be32(&vpd->data[24]);
if (lba_count && desc_count)
sdkp->max_unmap_blocks = lba_count;
sdkp->unmap_granularity = get_unaligned_be32(&vpd->data[28]);
if (vpd->data[32] & 0x80)
sdkp->unmap_alignment =
get_unaligned_be32(&vpd->data[32]) & ~(1 << 31);
if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
if (sdkp->max_unmap_blocks)
sd_config_discard(sdkp, SD_LBP_UNMAP);
else
sd_config_discard(sdkp, SD_LBP_WS16);
} else { /* LBP VPD page tells us what to use */
if (sdkp->lbpu && sdkp->max_unmap_blocks)
sd_config_discard(sdkp, SD_LBP_UNMAP);
else if (sdkp->lbpws)
sd_config_discard(sdkp, SD_LBP_WS16);
else if (sdkp->lbpws10)
sd_config_discard(sdkp, SD_LBP_WS10);
else
sd_config_discard(sdkp, SD_LBP_DISABLE);
}
}
out:
rcu_read_unlock();
}
/* Parse the Block Limits Extension VPD page (0xb7) */
static void sd_read_block_limits_ext(struct scsi_disk *sdkp)
{
struct scsi_vpd *vpd;
rcu_read_lock();
vpd = rcu_dereference(sdkp->device->vpd_pgb7);
if (vpd && vpd->len >= 2)
sdkp->rscs = vpd->data[5] & 1;
rcu_read_unlock();
}
/**
* sd_read_block_characteristics - Query block dev. characteristics
* @sdkp: disk to query
*/
static void sd_read_block_characteristics(struct scsi_disk *sdkp)
{
struct request_queue *q = sdkp->disk->queue;
struct scsi_vpd *vpd;
u16 rot;
rcu_read_lock();
vpd = rcu_dereference(sdkp->device->vpd_pgb1);
if (!vpd || vpd->len < 8) {
rcu_read_unlock();
return;
}
rot = get_unaligned_be16(&vpd->data[4]);
sdkp->zoned = (vpd->data[8] >> 4) & 3;
rcu_read_unlock();
if (rot == 1) {
blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, q);
}
#ifdef CONFIG_BLK_DEV_ZONED /* sd_probe rejects ZBD devices early otherwise */
if (sdkp->device->type == TYPE_ZBC) {
/*
* Host-managed.
*/
disk_set_zoned(sdkp->disk);
/*
* Per ZBC and ZAC specifications, writes in sequential write
* required zones of host-managed devices must be aligned to
* the device physical block size.
*/
blk_queue_zone_write_granularity(q, sdkp->physical_block_size);
} else {
/*
* Host-aware devices are treated as conventional.
*/
WARN_ON_ONCE(blk_queue_is_zoned(q));
}
#endif /* CONFIG_BLK_DEV_ZONED */
if (!sdkp->first_scan)
return;
if (blk_queue_is_zoned(q))
sd_printk(KERN_NOTICE, sdkp, "Host-managed zoned block device\n");
else if (sdkp->zoned == 1)
sd_printk(KERN_NOTICE, sdkp, "Host-aware SMR disk used as regular disk\n");
else if (sdkp->zoned == 2)
sd_printk(KERN_NOTICE, sdkp, "Drive-managed SMR disk\n");
}
/**
* sd_read_block_provisioning - Query provisioning VPD page
* @sdkp: disk to query
*/
static void sd_read_block_provisioning(struct scsi_disk *sdkp)
{
struct scsi_vpd *vpd;
if (sdkp->lbpme == 0)
return;
rcu_read_lock();
vpd = rcu_dereference(sdkp->device->vpd_pgb2);
if (!vpd || vpd->len < 8) {
rcu_read_unlock();
return;
}
sdkp->lbpvpd = 1;
sdkp->lbpu = (vpd->data[5] >> 7) & 1; /* UNMAP */
sdkp->lbpws = (vpd->data[5] >> 6) & 1; /* WRITE SAME(16) w/ UNMAP */
sdkp->lbpws10 = (vpd->data[5] >> 5) & 1; /* WRITE SAME(10) w/ UNMAP */
rcu_read_unlock();
}
static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
{
struct scsi_device *sdev = sdkp->device;
if (sdev->host->no_write_same) {
sdev->no_write_same = 1;
return;
}
if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY, 0) < 0) {
struct scsi_vpd *vpd;
sdev->no_report_opcodes = 1;
/* Disable WRITE SAME if REPORT SUPPORTED OPERATION
* CODES is unsupported and the device has an ATA
* Information VPD page (SAT).
*/
rcu_read_lock();
vpd = rcu_dereference(sdev->vpd_pg89);
if (vpd)
sdev->no_write_same = 1;
rcu_read_unlock();
}
if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16, 0) == 1)
sdkp->ws16 = 1;
if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME, 0) == 1)
sdkp->ws10 = 1;
}
static void sd_read_security(struct scsi_disk *sdkp, unsigned char *buffer)
{
struct scsi_device *sdev = sdkp->device;
if (!sdev->security_supported)
return;
if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE,
SECURITY_PROTOCOL_IN, 0) == 1 &&
scsi_report_opcode(sdev, buffer, SD_BUF_SIZE,
SECURITY_PROTOCOL_OUT, 0) == 1)
sdkp->security = 1;
}
static inline sector_t sd64_to_sectors(struct scsi_disk *sdkp, u8 *buf)
{
return logical_to_sectors(sdkp->device, get_unaligned_be64(buf));
}
/**
* sd_read_cpr - Query concurrent positioning ranges
* @sdkp: disk to query
*/
static void sd_read_cpr(struct scsi_disk *sdkp)
{
struct blk_independent_access_ranges *iars = NULL;
unsigned char *buffer = NULL;
unsigned int nr_cpr = 0;
int i, vpd_len, buf_len = SD_BUF_SIZE;
u8 *desc;
/*
* We need to have the capacity set first for the block layer to be
* able to check the ranges.
*/
if (sdkp->first_scan)
return;
if (!sdkp->capacity)
goto out;
/*
* Concurrent Positioning Ranges VPD: there can be at most 256 ranges,
* leading to a maximum page size of 64 + 256*32 bytes.
*/
buf_len = 64 + 256*32;
buffer = kmalloc(buf_len, GFP_KERNEL);
if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb9, buffer, buf_len))
goto out;
/* We must have at least a 64B header and one 32B range descriptor */
vpd_len = get_unaligned_be16(&buffer[2]) + 4;
if (vpd_len > buf_len || vpd_len < 64 + 32 || (vpd_len & 31)) {
sd_printk(KERN_ERR, sdkp,
"Invalid Concurrent Positioning Ranges VPD page\n");
goto out;
}
nr_cpr = (vpd_len - 64) / 32;
if (nr_cpr == 1) {
nr_cpr = 0;
goto out;
}
iars = disk_alloc_independent_access_ranges(sdkp->disk, nr_cpr);
if (!iars) {
nr_cpr = 0;
goto out;
}
desc = &buffer[64];
for (i = 0; i < nr_cpr; i++, desc += 32) {
if (desc[0] != i) {
sd_printk(KERN_ERR, sdkp,
"Invalid Concurrent Positioning Range number\n");
nr_cpr = 0;
break;
}
iars->ia_range[i].sector = sd64_to_sectors(sdkp, desc + 8);
iars->ia_range[i].nr_sectors = sd64_to_sectors(sdkp, desc + 16);
}
out:
disk_set_independent_access_ranges(sdkp->disk, iars);
if (nr_cpr && sdkp->nr_actuators != nr_cpr) {
sd_printk(KERN_NOTICE, sdkp,
"%u concurrent positioning ranges\n", nr_cpr);
sdkp->nr_actuators = nr_cpr;
}
kfree(buffer);
}
static bool sd_validate_min_xfer_size(struct scsi_disk *sdkp)
{
struct scsi_device *sdp = sdkp->device;
unsigned int min_xfer_bytes =
logical_to_bytes(sdp, sdkp->min_xfer_blocks);
if (sdkp->min_xfer_blocks == 0)
return false;
if (min_xfer_bytes & (sdkp->physical_block_size - 1)) {
sd_first_printk(KERN_WARNING, sdkp,
"Preferred minimum I/O size %u bytes not a " \
"multiple of physical block size (%u bytes)\n",
min_xfer_bytes, sdkp->physical_block_size);
sdkp->min_xfer_blocks = 0;
return false;
}
sd_first_printk(KERN_INFO, sdkp, "Preferred minimum I/O size %u bytes\n",
min_xfer_bytes);
return true;
}
/*
* Determine the device's preferred I/O size for reads and writes
* unless the reported value is unreasonably small, large, not a
* multiple of the physical block size, or simply garbage.
*/
static bool sd_validate_opt_xfer_size(struct scsi_disk *sdkp,
unsigned int dev_max)
{
struct scsi_device *sdp = sdkp->device;
unsigned int opt_xfer_bytes =
logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
unsigned int min_xfer_bytes =
logical_to_bytes(sdp, sdkp->min_xfer_blocks);
if (sdkp->opt_xfer_blocks == 0)
return false;
if (sdkp->opt_xfer_blocks > dev_max) {
sd_first_printk(KERN_WARNING, sdkp,
"Optimal transfer size %u logical blocks " \
"> dev_max (%u logical blocks)\n",
sdkp->opt_xfer_blocks, dev_max);
return false;
}
if (sdkp->opt_xfer_blocks > SD_DEF_XFER_BLOCKS) {
sd_first_printk(KERN_WARNING, sdkp,
"Optimal transfer size %u logical blocks " \
"> sd driver limit (%u logical blocks)\n",
sdkp->opt_xfer_blocks, SD_DEF_XFER_BLOCKS);
return false;
}
if (opt_xfer_bytes < PAGE_SIZE) {
sd_first_printk(KERN_WARNING, sdkp,
"Optimal transfer size %u bytes < " \
"PAGE_SIZE (%u bytes)\n",
opt_xfer_bytes, (unsigned int)PAGE_SIZE);
return false;
}
if (min_xfer_bytes && opt_xfer_bytes % min_xfer_bytes) {
sd_first_printk(KERN_WARNING, sdkp,
"Optimal transfer size %u bytes not a " \
"multiple of preferred minimum block " \
"size (%u bytes)\n",
opt_xfer_bytes, min_xfer_bytes);
return false;
}
if (opt_xfer_bytes & (sdkp->physical_block_size - 1)) {
sd_first_printk(KERN_WARNING, sdkp,
"Optimal transfer size %u bytes not a " \
"multiple of physical block size (%u bytes)\n",
opt_xfer_bytes, sdkp->physical_block_size);
return false;
}
sd_first_printk(KERN_INFO, sdkp, "Optimal transfer size %u bytes\n",
opt_xfer_bytes);
return true;
}
static void sd_read_block_zero(struct scsi_disk *sdkp)
{
unsigned int buf_len = sdkp->device->sector_size;
char *buffer, cmd[10] = { };
buffer = kmalloc(buf_len, GFP_KERNEL);
if (!buffer)
return;
cmd[0] = READ_10;
put_unaligned_be32(0, &cmd[2]); /* Logical block address 0 */
put_unaligned_be16(1, &cmd[7]); /* Transfer 1 logical block */
scsi_execute_cmd(sdkp->device, cmd, REQ_OP_DRV_IN, buffer, buf_len,
SD_TIMEOUT, sdkp->max_retries, NULL);
kfree(buffer);
}
/**
* sd_revalidate_disk - called the first time a new disk is seen,
* performs disk spin up, read_capacity, etc.
* @disk: struct gendisk we care about
**/
static int sd_revalidate_disk(struct gendisk *disk)
{
struct scsi_disk *sdkp = scsi_disk(disk);
struct scsi_device *sdp = sdkp->device;
struct request_queue *q = sdkp->disk->queue;
sector_t old_capacity = sdkp->capacity;
unsigned char *buffer;
unsigned int dev_max, rw_max;
SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
"sd_revalidate_disk\n"));
/*
* If the device is offline, don't try and read capacity or any
* of the other niceties.
*/
if (!scsi_device_online(sdp))
goto out;
buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
if (!buffer) {
sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
"allocation failure.\n");
goto out;
}
sd_spinup_disk(sdkp);
/*
* Without media there is no reason to ask; moreover, some devices
* react badly if we do.
*/
if (sdkp->media_present) {
sd_read_capacity(sdkp, buffer);
/*
* Some USB/UAS devices return generic values for mode pages
* until the media has been accessed. Trigger a READ operation
* to force the device to populate mode pages.
*/
if (sdp->read_before_ms)
sd_read_block_zero(sdkp);
/*
* set the default to rotational. All non-rotational devices
* support the block characteristics VPD page, which will
* cause this to be updated correctly and any device which
* doesn't support it should be treated as rotational.
*/
blk_queue_flag_clear(QUEUE_FLAG_NONROT, q);
blk_queue_flag_set(QUEUE_FLAG_ADD_RANDOM, q);
if (scsi_device_supports_vpd(sdp)) {
sd_read_block_provisioning(sdkp);
sd_read_block_limits(sdkp);
sd_read_block_limits_ext(sdkp);
sd_read_block_characteristics(sdkp);
sd_zbc_read_zones(sdkp, buffer);
sd_read_cpr(sdkp);
}
sd_print_capacity(sdkp, old_capacity);
sd_read_write_protect_flag(sdkp, buffer);
sd_read_cache_type(sdkp, buffer);
sd_read_io_hints(sdkp, buffer);
sd_read_app_tag_own(sdkp, buffer);
sd_read_write_same(sdkp, buffer);
sd_read_security(sdkp, buffer);
sd_config_protection(sdkp);
}
/*
* We now have all cache related info, determine how we deal
* with flush requests.
*/
sd_set_flush_flag(sdkp);
/* Initial block count limit based on CDB TRANSFER LENGTH field size. */
dev_max = sdp->use_16_for_rw ? SD_MAX_XFER_BLOCKS : SD_DEF_XFER_BLOCKS;
/* Some devices report a maximum block count for READ/WRITE requests. */
dev_max = min_not_zero(dev_max, sdkp->max_xfer_blocks);
q->limits.max_dev_sectors = logical_to_sectors(sdp, dev_max);
if (sd_validate_min_xfer_size(sdkp))
blk_queue_io_min(sdkp->disk->queue,
logical_to_bytes(sdp, sdkp->min_xfer_blocks));
else
blk_queue_io_min(sdkp->disk->queue, 0);
if (sd_validate_opt_xfer_size(sdkp, dev_max)) {
q->limits.io_opt = logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
rw_max = logical_to_sectors(sdp, sdkp->opt_xfer_blocks);
} else {
q->limits.io_opt = 0;
rw_max = min_not_zero(logical_to_sectors(sdp, dev_max),
(sector_t)BLK_DEF_MAX_SECTORS_CAP);
}
/*
* Limit default to SCSI host optimal sector limit if set. There may be
* an impact on performance for when the size of a request exceeds this
* host limit.
*/
rw_max = min_not_zero(rw_max, sdp->host->opt_sectors);
/* Do not exceed controller limit */
rw_max = min(rw_max, queue_max_hw_sectors(q));
/*
* Only update max_sectors if previously unset or if the current value
* exceeds the capabilities of the hardware.
*/
if (sdkp->first_scan ||
q->limits.max_sectors > q->limits.max_dev_sectors ||
q->limits.max_sectors > q->limits.max_hw_sectors)
q->limits.max_sectors = rw_max;
sdkp->first_scan = 0;
set_capacity_and_notify(disk, logical_to_sectors(sdp, sdkp->capacity));
sd_config_write_same(sdkp);
kfree(buffer);
/*
* For a zoned drive, revalidating the zones can be done only once
* the gendisk capacity is set. So if this fails, set back the gendisk
* capacity to 0.
*/
if (sd_zbc_revalidate_zones(sdkp))
set_capacity_and_notify(disk, 0);
out:
return 0;
}
/**
* sd_unlock_native_capacity - unlock native capacity
* @disk: struct gendisk to set capacity for
*
* Block layer calls this function if it detects that partitions
* on @disk reach beyond the end of the device. If the SCSI host
* implements ->unlock_native_capacity() method, it's invoked to
* give it a chance to adjust the device capacity.
*
* CONTEXT:
* Defined by block layer. Might sleep.
*/
static void sd_unlock_native_capacity(struct gendisk *disk)
{
struct scsi_device *sdev = scsi_disk(disk)->device;
if (sdev->host->hostt->unlock_native_capacity)
sdev->host->hostt->unlock_native_capacity(sdev);
}
/**
* sd_format_disk_name - format disk name
* @prefix: name prefix - ie. "sd" for SCSI disks
* @index: index of the disk to format name for
* @buf: output buffer
* @buflen: length of the output buffer
*
* SCSI disk names starts at sda. The 26th device is sdz and the
* 27th is sdaa. The last one for two lettered suffix is sdzz
* which is followed by sdaaa.
*
* This is basically 26 base counting with one extra 'nil' entry
* at the beginning from the second digit on and can be
* determined using similar method as 26 base conversion with the
* index shifted -1 after each digit is computed.
*
* CONTEXT:
* Don't care.
*
* RETURNS:
* 0 on success, -errno on failure.
*/
static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
{
const int base = 'z' - 'a' + 1;
char *begin = buf + strlen(prefix);
char *end = buf + buflen;
char *p;
int unit;
p = end - 1;
*p = '\0';
unit = base;
do {
if (p == begin)
return -EINVAL;
*--p = 'a' + (index % unit);
index = (index / unit) - 1;
} while (index >= 0);
memmove(begin, p, end - p);
memcpy(buf, prefix, strlen(prefix));
return 0;
}
/**
* sd_probe - called during driver initialization and whenever a
* new scsi device is attached to the system. It is called once
* for each scsi device (not just disks) present.
* @dev: pointer to device object
*
* Returns 0 if successful (or not interested in this scsi device
* (e.g. scanner)); 1 when there is an error.
*
* Note: this function is invoked from the scsi mid-level.
* This function sets up the mapping between a given
* <host,channel,id,lun> (found in sdp) and new device name
* (e.g. /dev/sda). More precisely it is the block device major
* and minor number that is chosen here.
*
* Assume sd_probe is not re-entrant (for time being)
* Also think about sd_probe() and sd_remove() running coincidentally.
**/
static int sd_probe(struct device *dev)
{
struct scsi_device *sdp = to_scsi_device(dev);
struct scsi_disk *sdkp;
struct gendisk *gd;
int index;
int error;
scsi_autopm_get_device(sdp);
error = -ENODEV;
if (sdp->type != TYPE_DISK &&
sdp->type != TYPE_ZBC &&
sdp->type != TYPE_MOD &&
sdp->type != TYPE_RBC)
goto out;
if (!IS_ENABLED(CONFIG_BLK_DEV_ZONED) && sdp->type == TYPE_ZBC) {
sdev_printk(KERN_WARNING, sdp,
"Unsupported ZBC host-managed device.\n");
goto out;
}
SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
"sd_probe\n"));
error = -ENOMEM;
sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
if (!sdkp)
goto out;
gd = blk_mq_alloc_disk_for_queue(sdp->request_queue,
&sd_bio_compl_lkclass);
if (!gd)
goto out_free;
index = ida_alloc(&sd_index_ida, GFP_KERNEL);
if (index < 0) {
sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
goto out_put;
}
error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
if (error) {
sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
goto out_free_index;
}
sdkp->device = sdp;
sdkp->disk = gd;
sdkp->index = index;
sdkp->max_retries = SD_MAX_RETRIES;
atomic_set(&sdkp->openers, 0);
atomic_set(&sdkp->device->ioerr_cnt, 0);
if (!sdp->request_queue->rq_timeout) {
if (sdp->type != TYPE_MOD)
blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
else
blk_queue_rq_timeout(sdp->request_queue,
SD_MOD_TIMEOUT);
}
device_initialize(&sdkp->disk_dev);
sdkp->disk_dev.parent = get_device(dev);
sdkp->disk_dev.class = &sd_disk_class;
dev_set_name(&sdkp->disk_dev, "%s", dev_name(dev));
error = device_add(&sdkp->disk_dev);
if (error) {
put_device(&sdkp->disk_dev);
goto out;
}
dev_set_drvdata(dev, sdkp);
gd->major = sd_major((index & 0xf0) >> 4);
gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
gd->minors = SD_MINORS;
gd->fops = &sd_fops;
gd->private_data = sdkp;
/* defaults, until the device tells us otherwise */
sdp->sector_size = 512;
sdkp->capacity = 0;
sdkp->media_present = 1;
sdkp->write_prot = 0;
sdkp->cache_override = 0;
sdkp->WCE = 0;
sdkp->RCD = 0;
sdkp->ATO = 0;
sdkp->first_scan = 1;
sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
sd_revalidate_disk(gd);
if (sdp->removable) {
gd->flags |= GENHD_FL_REMOVABLE;
gd->events |= DISK_EVENT_MEDIA_CHANGE;
gd->event_flags = DISK_EVENT_FLAG_POLL | DISK_EVENT_FLAG_UEVENT;
}
blk_pm_runtime_init(sdp->request_queue, dev);
if (sdp->rpm_autosuspend) {
pm_runtime_set_autosuspend_delay(dev,
sdp->host->rpm_autosuspend_delay);
}
error = device_add_disk(dev, gd, NULL);
if (error) {
put_device(&sdkp->disk_dev);
put_disk(gd);
goto out;
}
if (sdkp->security) {
sdkp->opal_dev = init_opal_dev(sdkp, &sd_sec_submit);
if (sdkp->opal_dev)
sd_printk(KERN_NOTICE, sdkp, "supports TCG Opal\n");
}
sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
sdp->removable ? "removable " : "");
scsi_autopm_put_device(sdp);
return 0;
out_free_index:
ida_free(&sd_index_ida, index);
out_put:
put_disk(gd);
out_free:
kfree(sdkp);
out:
scsi_autopm_put_device(sdp);
return error;
}
/**
* sd_remove - called whenever a scsi disk (previously recognized by
* sd_probe) is detached from the system. It is called (potentially
* multiple times) during sd module unload.
* @dev: pointer to device object
*
* Note: this function is invoked from the scsi mid-level.
* This function potentially frees up a device name (e.g. /dev/sdc)
* that could be re-used by a subsequent sd_probe().
* This function is not called when the built-in sd driver is "exit-ed".
**/
static int sd_remove(struct device *dev)
{
struct scsi_disk *sdkp = dev_get_drvdata(dev);
scsi_autopm_get_device(sdkp->device);
device_del(&sdkp->disk_dev);
del_gendisk(sdkp->disk);
if (!sdkp->suspended)
sd_shutdown(dev);
put_disk(sdkp->disk);
return 0;
}
static void scsi_disk_release(struct device *dev)
{
struct scsi_disk *sdkp = to_scsi_disk(dev);
ida_free(&sd_index_ida, sdkp->index);
sd_zbc_free_zone_info(sdkp);
put_device(&sdkp->device->sdev_gendev);
free_opal_dev(sdkp->opal_dev);
kfree(sdkp);
}
static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
{
unsigned char cmd[6] = { START_STOP }; /* START_VALID */
struct scsi_sense_hdr sshdr;
const struct scsi_exec_args exec_args = {
.sshdr = &sshdr,
.req_flags = BLK_MQ_REQ_PM,
};
struct scsi_device *sdp = sdkp->device;
int res;
if (start)
cmd[4] |= 1; /* START */
if (sdp->start_stop_pwr_cond)
cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
if (!scsi_device_online(sdp))
return -ENODEV;
res = scsi_execute_cmd(sdp, cmd, REQ_OP_DRV_IN, NULL, 0, SD_TIMEOUT,
sdkp->max_retries, &exec_args);
if (res) {
sd_print_result(sdkp, "Start/Stop Unit failed", res);
if (res > 0 && scsi_sense_valid(&sshdr)) {
sd_print_sense_hdr(sdkp, &sshdr);
/* 0x3a is medium not present */
if (sshdr.asc == 0x3a)
res = 0;
}
}
/* SCSI error codes must not go to the generic layer */
if (res)
return -EIO;
return 0;
}
/*
* Send a SYNCHRONIZE CACHE instruction down to the device through
* the normal SCSI command structure. Wait for the command to
* complete.
*/
static void sd_shutdown(struct device *dev)
{
struct scsi_disk *sdkp = dev_get_drvdata(dev);
if (!sdkp)
return; /* this can happen */
if (pm_runtime_suspended(dev))
return;
if (sdkp->WCE && sdkp->media_present) {
sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
sd_sync_cache(sdkp);
}
if ((system_state != SYSTEM_RESTART &&
sdkp->device->manage_system_start_stop) ||
(system_state == SYSTEM_POWER_OFF &&
sdkp->device->manage_shutdown)) {
sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
sd_start_stop_device(sdkp, 0);
}
}
static inline bool sd_do_start_stop(struct scsi_device *sdev, bool runtime)
{
return (sdev->manage_system_start_stop && !runtime) ||
(sdev->manage_runtime_start_stop && runtime);
}
static int sd_suspend_common(struct device *dev, bool runtime)
{
struct scsi_disk *sdkp = dev_get_drvdata(dev);
int ret = 0;
if (!sdkp) /* E.g.: runtime suspend following sd_remove() */
return 0;
if (sdkp->WCE && sdkp->media_present) {
if (!sdkp->device->silence_suspend)
sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
ret = sd_sync_cache(sdkp);
/* ignore OFFLINE device */
if (ret == -ENODEV)
return 0;
if (ret)
return ret;
}
if (sd_do_start_stop(sdkp->device, runtime)) {
if (!sdkp->device->silence_suspend)
sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
/* an error is not worth aborting a system sleep */
ret = sd_start_stop_device(sdkp, 0);
if (!runtime)
ret = 0;
}
if (!ret)
sdkp->suspended = true;
return ret;
}
static int sd_suspend_system(struct device *dev)
{
if (pm_runtime_suspended(dev))
return 0;
return sd_suspend_common(dev, false);
}
static int sd_suspend_runtime(struct device *dev)
{
return sd_suspend_common(dev, true);
}
static int sd_resume(struct device *dev, bool runtime)
{
struct scsi_disk *sdkp = dev_get_drvdata(dev);
int ret;
if (!sdkp) /* E.g.: runtime resume at the start of sd_probe() */
return 0;
if (!sd_do_start_stop(sdkp->device, runtime)) {
sdkp->suspended = false;
return 0;
}
sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
ret = sd_start_stop_device(sdkp, 1);
if (!ret) {
opal_unlock_from_suspend(sdkp->opal_dev);
sdkp->suspended = false;
}
return ret;
}
static int sd_resume_system(struct device *dev)
{
if (pm_runtime_suspended(dev)) {
struct scsi_disk *sdkp = dev_get_drvdata(dev);
struct scsi_device *sdp = sdkp ? sdkp->device : NULL;
if (sdp && sdp->force_runtime_start_on_system_start)
pm_request_resume(dev);
return 0;
}
return sd_resume(dev, false);
}
static int sd_resume_runtime(struct device *dev)
{
struct scsi_disk *sdkp = dev_get_drvdata(dev);
struct scsi_device *sdp;
if (!sdkp) /* E.g.: runtime resume at the start of sd_probe() */
return 0;
sdp = sdkp->device;
if (sdp->ignore_media_change) {
/* clear the device's sense data */
static const u8 cmd[10] = { REQUEST_SENSE };
const struct scsi_exec_args exec_args = {
.req_flags = BLK_MQ_REQ_PM,
};
if (scsi_execute_cmd(sdp, cmd, REQ_OP_DRV_IN, NULL, 0,
sdp->request_queue->rq_timeout, 1,
&exec_args))
sd_printk(KERN_NOTICE, sdkp,
"Failed to clear sense data\n");
}
return sd_resume(dev, true);
}
static const struct dev_pm_ops sd_pm_ops = {
.suspend = sd_suspend_system,
.resume = sd_resume_system,
.poweroff = sd_suspend_system,
.restore = sd_resume_system,
.runtime_suspend = sd_suspend_runtime,
.runtime_resume = sd_resume_runtime,
};
static struct scsi_driver sd_template = {
.gendrv = {
.name = "sd",
.owner = THIS_MODULE,
.probe = sd_probe,
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
.remove = sd_remove,
.shutdown = sd_shutdown,
.pm = &sd_pm_ops,
},
.rescan = sd_rescan,
.init_command = sd_init_command,
.uninit_command = sd_uninit_command,
.done = sd_done,
.eh_action = sd_eh_action,
.eh_reset = sd_eh_reset,
};
/**
* init_sd - entry point for this driver (both when built in or when
* a module).
*
* Note: this function registers this driver with the scsi mid-level.
**/
static int __init init_sd(void)
{
int majors = 0, i, err;
SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
for (i = 0; i < SD_MAJORS; i++) {
if (__register_blkdev(sd_major(i), "sd", sd_default_probe))
continue;
majors++;
}
if (!majors)
return -ENODEV;
err = class_register(&sd_disk_class);
if (err)
goto err_out;
sd_page_pool = mempool_create_page_pool(SD_MEMPOOL_SIZE, 0);
if (!sd_page_pool) {
printk(KERN_ERR "sd: can't init discard page pool\n");
err = -ENOMEM;
goto err_out_class;
}
err = scsi_register_driver(&sd_template.gendrv);
if (err)
goto err_out_driver;
return 0;
err_out_driver:
mempool_destroy(sd_page_pool);
err_out_class:
class_unregister(&sd_disk_class);
err_out:
for (i = 0; i < SD_MAJORS; i++)
unregister_blkdev(sd_major(i), "sd");
return err;
}
/**
* exit_sd - exit point for this driver (when it is a module).
*
* Note: this function unregisters this driver from the scsi mid-level.
**/
static void __exit exit_sd(void)
{
int i;
SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
scsi_unregister_driver(&sd_template.gendrv);
mempool_destroy(sd_page_pool);
class_unregister(&sd_disk_class);
for (i = 0; i < SD_MAJORS; i++)
unregister_blkdev(sd_major(i), "sd");
}
module_init(init_sd);
module_exit(exit_sd);
void sd_print_sense_hdr(struct scsi_disk *sdkp, struct scsi_sense_hdr *sshdr)
{
scsi_print_sense_hdr(sdkp->device,
sdkp->disk ? sdkp->disk->disk_name : NULL, sshdr);
}
void sd_print_result(const struct scsi_disk *sdkp, const char *msg, int result)
{
const char *hb_string = scsi_hostbyte_string(result);
if (hb_string)
sd_printk(KERN_INFO, sdkp,
"%s: Result: hostbyte=%s driverbyte=%s\n", msg,
hb_string ? hb_string : "invalid",
"DRIVER_OK");
else
sd_printk(KERN_INFO, sdkp,
"%s: Result: hostbyte=0x%02x driverbyte=%s\n",
msg, host_byte(result), "DRIVER_OK");
}
Reference in New Issue View Git Blame Copy Permalink