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[S390] cio: use ccw request infrastructure for sense id

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Use the newly introduced ccw request infrastructure to implement
the sense id operation.

Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Peter Oberparleiter 2009-12-07 12:51:26 +01:00 committed by Martin Schwidefsky
parent e1f0fbd655
commit 39f5360b3d
3 changed files with 156 additions and 290 deletions
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1
drivers/s390/cio/device.h
View File

@ -108,7 +108,6 @@ void ccw_request_notoper(struct ccw_device *cdev);
/* Function prototypes for sense id stuff. */
void ccw_device_sense_id_start(struct ccw_device *);
void ccw_device_sense_id_irq(struct ccw_device *, enum dev_event);
void ccw_device_sense_id_done(struct ccw_device *, int);
/* Function prototypes for path grouping stuff. */

66
drivers/s390/cio/device_fsm.c
View File

@ -229,7 +229,6 @@ ccw_device_recog_done(struct ccw_device *cdev, int state)
sch = to_subchannel(cdev->dev.parent);
ccw_device_set_timeout(cdev, 0);
cio_disable_subchannel(sch);
/*
* Now that we tried recognition, we have performed device selection
@ -263,22 +262,10 @@ ccw_device_recog_done(struct ccw_device *cdev, int state)
}
switch (state) {
case DEV_STATE_NOT_OPER:
CIO_MSG_EVENT(2, "SenseID : unknown device %04x on "
"subchannel 0.%x.%04x\n",
cdev->private->dev_id.devno,
sch->schid.ssid, sch->schid.sch_no);
break;
case DEV_STATE_OFFLINE:
if (!cdev->online) {
ccw_device_update_sense_data(cdev);
/* Issue device info message. */
CIO_MSG_EVENT(4, "SenseID : device 0.%x.%04x reports: "
"CU Type/Mod = %04X/%02X, Dev Type/Mod "
"= %04X/%02X\n",
cdev->private->dev_id.ssid,
cdev->private->dev_id.devno,
cdev->id.cu_type, cdev->id.cu_model,
cdev->id.dev_type, cdev->id.dev_model);
break;
}
cdev->private->state = DEV_STATE_OFFLINE;
@ -293,10 +280,6 @@ ccw_device_recog_done(struct ccw_device *cdev, int state)
}
return;
case DEV_STATE_BOXED:
CIO_MSG_EVENT(0, "SenseID : boxed device %04x on "
" subchannel 0.%x.%04x\n",
cdev->private->dev_id.devno,
sch->schid.ssid, sch->schid.sch_no);
if (cdev->id.cu_type != 0) { /* device was recognized before */
cdev->private->flags.recog_done = 1;
cdev->private->state = DEV_STATE_BOXED;
@ -520,27 +503,25 @@ void ccw_device_recognition(struct ccw_device *cdev)
}
/*
* Handle timeout in device recognition.
* Handle events for states that use the ccw request infrastructure.
*/
static void
ccw_device_recog_timeout(struct ccw_device *cdev, enum dev_event dev_event)
static void ccw_device_request_event(struct ccw_device *cdev, enum dev_event e)
{
int ret;
ret = ccw_device_cancel_halt_clear(cdev);
switch (ret) {
case 0:
ccw_device_recog_done(cdev, DEV_STATE_BOXED);
switch (e) {
case DEV_EVENT_NOTOPER:
ccw_request_notoper(cdev);
break;
case -ENODEV:
ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
case DEV_EVENT_INTERRUPT:
ccw_request_handler(cdev);
break;
case DEV_EVENT_TIMEOUT:
ccw_request_timeout(cdev);
break;
default:
ccw_device_set_timeout(cdev, 3*HZ);
break;
}
}
void
ccw_device_verify_done(struct ccw_device *cdev, int err)
{
@ -712,15 +693,6 @@ ccw_device_onoff_timeout(struct ccw_device *cdev, enum dev_event dev_event)
}
}
/*
* Handle not oper event in device recognition.
*/
static void
ccw_device_recog_notoper(struct ccw_device *cdev, enum dev_event dev_event)
{
ccw_device_recog_done(cdev, DEV_STATE_NOT_OPER);
}
/*
* Handle not operational event in non-special state.
*/
@ -1015,10 +987,6 @@ ccw_device_start_id(struct ccw_device *cdev, enum dev_event dev_event)
if (cio_enable_subchannel(sch, (u32)(addr_t)sch) != 0)
/* Couldn't enable the subchannel for i/o. Sick device. */
return;
/* After 60s the device recognition is considered to have failed. */
ccw_device_set_timeout(cdev, 60*HZ);
cdev->private->state = DEV_STATE_DISCONNECTED_SENSE_ID;
ccw_device_sense_id_start(cdev);
}
@ -1141,9 +1109,9 @@ fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
[DEV_EVENT_VERIFY] = ccw_device_nop,
},
[DEV_STATE_SENSE_ID] = {
[DEV_EVENT_NOTOPER] = ccw_device_recog_notoper,
[DEV_EVENT_INTERRUPT] = ccw_device_sense_id_irq,
[DEV_EVENT_TIMEOUT] = ccw_device_recog_timeout,
[DEV_EVENT_NOTOPER] = ccw_device_request_event,
[DEV_EVENT_INTERRUPT] = ccw_device_request_event,
[DEV_EVENT_TIMEOUT] = ccw_device_request_event,
[DEV_EVENT_VERIFY] = ccw_device_nop,
},
[DEV_STATE_OFFLINE] = {
@ -1209,9 +1177,9 @@ fsm_func_t *dev_jumptable[NR_DEV_STATES][NR_DEV_EVENTS] = {
[DEV_EVENT_VERIFY] = ccw_device_start_id,
},
[DEV_STATE_DISCONNECTED_SENSE_ID] = {
[DEV_EVENT_NOTOPER] = ccw_device_recog_notoper,
[DEV_EVENT_INTERRUPT] = ccw_device_sense_id_irq,
[DEV_EVENT_TIMEOUT] = ccw_device_recog_timeout,
[DEV_EVENT_NOTOPER] = ccw_device_request_event,
[DEV_EVENT_INTERRUPT] = ccw_device_request_event,
[DEV_EVENT_TIMEOUT] = ccw_device_request_event,
[DEV_EVENT_VERIFY] = ccw_device_nop,
},
[DEV_STATE_CMFCHANGE] = {

379
drivers/s390/cio/device_id.c
View File

@ -1,40 +1,39 @@
/*
* drivers/s390/cio/device_id.c
* CCW device SENSE ID I/O handling.
*
* Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
* IBM Corporation
* Author(s): Cornelia Huck (cornelia.huck@de.ibm.com)
* Martin Schwidefsky (schwidefsky@de.ibm.com)
*
* Sense ID functions.
* Copyright IBM Corp. 2002,2009
* Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
* Martin Schwidefsky <schwidefsky@de.ibm.com>
* Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <asm/ccwdev.h>
#include <asm/delay.h>
#include <asm/setup.h>
#include <asm/cio.h>
#include <asm/lowcore.h>
#include <asm/diag.h>
#include "cio.h"
#include "cio_debug.h"
#include "css.h"
#include "device.h"
#include "ioasm.h"
#include "io_sch.h"
#define SENSE_ID_RETRIES 5
#define SENSE_ID_TIMEOUT (10 * HZ)
#define SENSE_ID_MIN_LEN 4
#define SENSE_ID_BASIC_LEN 7
/**
* vm_vdev_to_cu_type - Convert vm virtual device into control unit type
* for certain devices.
* @class: virtual device class
* @type: virtual device type
* diag210_to_senseid - convert diag 0x210 data to sense id information
* @senseid: sense id
* @diag: diag 0x210 data
*
* Returns control unit type if a match was made or %0xffff otherwise.
* Return 0 on success, non-zero otherwise.
*/
static int vm_vdev_to_cu_type(int class, int type)
static int diag210_to_senseid(struct senseid *senseid, struct diag210 *diag)
{
static struct {
int class, type, cu_type;
@ -71,253 +70,153 @@ static int vm_vdev_to_cu_type(int class, int type)
};
int i;
for (i = 0; i < ARRAY_SIZE(vm_devices); i++)
if (class == vm_devices[i].class && type == vm_devices[i].type)
return vm_devices[i].cu_type;
return 0xffff;
}
/**
* diag_get_dev_info - retrieve device information via DIAG X'210'
* @devno: device number
* @ps: pointer to sense ID data area
*
* Returns zero on success, non-zero otherwise.
*/
static int diag_get_dev_info(u16 devno, struct senseid *ps)
{
struct diag210 diag_data;
int ccode;
CIO_TRACE_EVENT (4, "VMvdinf");
diag_data = (struct diag210) {
.vrdcdvno = devno,
.vrdclen = sizeof (diag_data),
};
ccode = diag210 (&diag_data);
if ((ccode == 0) || (ccode == 2)) {
ps->reserved = 0xff;
/* Special case for osa devices. */
if (diag_data.vrdcvcla == 0x02 && diag_data.vrdcvtyp == 0x20) {
ps->cu_type = 0x3088;
ps->cu_model = 0x60;
/* Special case for osa devices. */
if (diag->vrdcvcla == 0x02 && diag->vrdcvtyp == 0x20) {
senseid->cu_type = 0x3088;
senseid->cu_model = 0x60;
senseid->reserved = 0xff;
return 0;
}
for (i = 0; i < ARRAY_SIZE(vm_devices); i++) {
if (diag->vrdcvcla == vm_devices[i].class &&
diag->vrdcvtyp == vm_devices[i].type) {
senseid->cu_type = vm_devices[i].cu_type;
senseid->reserved = 0xff;
return 0;
}
ps->cu_type = vm_vdev_to_cu_type(diag_data.vrdcvcla,
diag_data.vrdcvtyp);
if (ps->cu_type != 0xffff)
return 0;
}
CIO_MSG_EVENT(0, "DIAG X'210' for device %04X returned (cc = %d):"
"vdev class : %02X, vdev type : %04X \n ... "
"rdev class : %02X, rdev type : %04X, "
"rdev model: %02X\n",
devno, ccode,
diag_data.vrdcvcla, diag_data.vrdcvtyp,
diag_data.vrdcrccl, diag_data.vrdccrty,
diag_data.vrdccrmd);
return -ENODEV;
}
/*
* Start Sense ID helper function.
* Try to obtain the 'control unit'/'device type' information
* associated with the subchannel.
/**
* diag_get_dev_info - retrieve device information via diag 0x210
* @cdev: ccw device
*
* Returns zero on success, non-zero otherwise.
*/
static int
__ccw_device_sense_id_start(struct ccw_device *cdev)
static int diag210_get_dev_info(struct ccw_device *cdev)
{
struct subchannel *sch;
struct ccw1 *ccw;
int ret;
struct ccw_dev_id *dev_id = &cdev->private->dev_id;
struct senseid *senseid = &cdev->private->senseid;
struct diag210 diag_data;
int rc;
sch = to_subchannel(cdev->dev.parent);
/* Setup sense channel program. */
ccw = cdev->private->iccws;
ccw->cmd_code = CCW_CMD_SENSE_ID;
ccw->cda = (__u32) __pa (&cdev->private->senseid);
ccw->count = sizeof (struct senseid);
ccw->flags = CCW_FLAG_SLI;
if (dev_id->ssid != 0)
return -ENODEV;
memset(&diag_data, 0, sizeof(diag_data));
diag_data.vrdcdvno = dev_id->devno;
diag_data.vrdclen = sizeof(diag_data);
rc = diag210(&diag_data);
CIO_TRACE_EVENT(4, "diag210");
CIO_HEX_EVENT(4, &rc, sizeof(rc));
CIO_HEX_EVENT(4, &diag_data, sizeof(diag_data));
if (rc != 0 && rc != 2)
goto err_failed;
if (diag210_to_senseid(senseid, &diag_data))
goto err_unknown;
return 0;
/* Reset device status. */
memset(&cdev->private->irb, 0, sizeof(struct irb));
/* Try on every path. */
ret = -ENODEV;
while (cdev->private->imask != 0) {
cdev->private->senseid.cu_type = 0xFFFF;
if ((sch->opm & cdev->private->imask) != 0 &&
cdev->private->iretry > 0) {
cdev->private->iretry--;
/* Reset internal retry indication. */
cdev->private->flags.intretry = 0;
ret = cio_start (sch, cdev->private->iccws,
cdev->private->imask);
/* ret is 0, -EBUSY, -EACCES or -ENODEV */
if (ret != -EACCES)
return ret;
}
cdev->private->imask >>= 1;
cdev->private->iretry = 5;
}
return ret;
}
void
ccw_device_sense_id_start(struct ccw_device *cdev)
{
int ret;
memset (&cdev->private->senseid, 0, sizeof (struct senseid));
cdev->private->imask = 0x80;
cdev->private->iretry = 5;
ret = __ccw_device_sense_id_start(cdev);
if (ret && ret != -EBUSY)
ccw_device_sense_id_done(cdev, ret);
err_unknown:
CIO_MSG_EVENT(0, "snsid: device 0.%x.%04x: unknown diag210 data\n",
dev_id->ssid, dev_id->devno);
return -ENODEV;
err_failed:
CIO_MSG_EVENT(0, "snsid: device 0.%x.%04x: diag210 failed (rc=%d)\n",
dev_id->ssid, dev_id->devno, rc);
return -ENODEV;
}
/*
* Called from interrupt context to check if a valid answer
* to Sense ID was received.
* Initialize SENSE ID data.
*/
static int
ccw_device_check_sense_id(struct ccw_device *cdev)
static void snsid_init(struct ccw_device *cdev)
{
struct subchannel *sch;
struct irb *irb;
cdev->private->flags.esid = 0;
memset(&cdev->private->senseid, 0, sizeof(cdev->private->senseid));
cdev->private->senseid.cu_type = 0xffff;
}
sch = to_subchannel(cdev->dev.parent);
irb = &cdev->private->irb;
/*
* Check for complete SENSE ID data.
*/
static int snsid_check(struct ccw_device *cdev, void *data)
{
struct cmd_scsw *scsw = &cdev->private->irb.scsw.cmd;
int len = sizeof(struct senseid) - scsw->count;
/* Check the error cases. */
if (irb->scsw.cmd.fctl & (SCSW_FCTL_HALT_FUNC | SCSW_FCTL_CLEAR_FUNC)) {
/* Retry Sense ID if requested. */
if (cdev->private->flags.intretry) {
cdev->private->flags.intretry = 0;
return -EAGAIN;
}
return -ETIME;
}
if (irb->esw.esw0.erw.cons && (irb->ecw[0] & SNS0_CMD_REJECT)) {
/*
* if the device doesn't support the SenseID
* command further retries wouldn't help ...
* NB: We don't check here for intervention required like we
* did before, because tape devices with no tape inserted
* may present this status *in conjunction with* the
* sense id information. So, for intervention required,
* we use the "whack it until it talks" strategy...
*/
CIO_MSG_EVENT(0, "SenseID : device %04x on Subchannel "
"0.%x.%04x reports cmd reject\n",
cdev->private->dev_id.devno, sch->schid.ssid,
sch->schid.sch_no);
/* Check for incomplete SENSE ID data. */
if (len < SENSE_ID_MIN_LEN)
goto out_restart;
if (cdev->private->senseid.cu_type == 0xffff)
goto out_restart;
/* Check for incompatible SENSE ID data. */
if (cdev->private->senseid.reserved != 0xff)
return -EOPNOTSUPP;
}
if (irb->esw.esw0.erw.cons) {
CIO_MSG_EVENT(2, "SenseID : UC on dev 0.%x.%04x, "
"lpum %02X, cnt %02d, sns :"
" %02X%02X%02X%02X %02X%02X%02X%02X ...\n",
cdev->private->dev_id.ssid,
cdev->private->dev_id.devno,
irb->esw.esw0.sublog.lpum,
irb->esw.esw0.erw.scnt,
irb->ecw[0], irb->ecw[1],
irb->ecw[2], irb->ecw[3],
irb->ecw[4], irb->ecw[5],
irb->ecw[6], irb->ecw[7]);
return -EAGAIN;
}
if (irb->scsw.cmd.cc == 3) {
u8 lpm;
/* Check for extended-identification information. */
if (len > SENSE_ID_BASIC_LEN)
cdev->private->flags.esid = 1;
return 0;
lpm = to_io_private(sch)->orb.cmd.lpm;
if ((lpm & sch->schib.pmcw.pim & sch->schib.pmcw.pam) != 0)
CIO_MSG_EVENT(4, "SenseID : path %02X for device %04x "
"on subchannel 0.%x.%04x is "
"'not operational'\n", lpm,
cdev->private->dev_id.devno,
sch->schid.ssid, sch->schid.sch_no);
return -EACCES;
}
/* Did we get a proper answer ? */
if (irb->scsw.cmd.cc == 0 && cdev->private->senseid.cu_type != 0xFFFF &&
cdev->private->senseid.reserved == 0xFF) {
if (irb->scsw.cmd.count < sizeof(struct senseid) - 8)
cdev->private->flags.esid = 1;
return 0; /* Success */
}
/* Hmm, whatever happened, try again. */
CIO_MSG_EVENT(2, "SenseID : start_IO() for device %04x on "
"subchannel 0.%x.%04x returns status %02X%02X\n",
cdev->private->dev_id.devno, sch->schid.ssid,
sch->schid.sch_no,
irb->scsw.cmd.dstat, irb->scsw.cmd.cstat);
out_restart:
snsid_init(cdev);
return -EAGAIN;
}
/*
* Got interrupt for Sense ID.
* Process SENSE ID request result.
*/
void
ccw_device_sense_id_irq(struct ccw_device *cdev, enum dev_event dev_event)
static void snsid_callback(struct ccw_device *cdev, void *data, int rc)
{
struct subchannel *sch;
struct irb *irb;
int ret;
struct ccw_dev_id *id = &cdev->private->dev_id;
struct senseid *senseid = &cdev->private->senseid;
int vm = 0;
sch = to_subchannel(cdev->dev.parent);
irb = (struct irb *) __LC_IRB;
/* Retry sense id, if needed. */
if (irb->scsw.cmd.stctl ==
(SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
if ((irb->scsw.cmd.cc == 1) || !irb->scsw.cmd.actl) {
ret = __ccw_device_sense_id_start(cdev);
if (ret && ret != -EBUSY)
ccw_device_sense_id_done(cdev, ret);
if (rc && MACHINE_IS_VM) {
/* Try diag 0x210 fallback on z/VM. */
snsid_init(cdev);
if (diag210_get_dev_info(cdev) == 0) {
rc = 0;
vm = 1;
}
return;
}
if (ccw_device_accumulate_and_sense(cdev, irb) != 0)
return;
ret = ccw_device_check_sense_id(cdev);
memset(&cdev->private->irb, 0, sizeof(struct irb));
switch (ret) {
/* 0, -ETIME, -EOPNOTSUPP, -EAGAIN or -EACCES */
case 0: /* Sense id succeeded. */
case -ETIME: /* Sense id stopped by timeout. */
ccw_device_sense_id_done(cdev, ret);
break;
case -EACCES: /* channel is not operational. */
sch->lpm &= ~cdev->private->imask;
cdev->private->imask >>= 1;
cdev->private->iretry = 5;
/* fall through. */
case -EAGAIN: /* try again. */
ret = __ccw_device_sense_id_start(cdev);
if (ret == 0 || ret == -EBUSY)
break;
/* fall through. */
default: /* Sense ID failed. Try asking VM. */
if (MACHINE_IS_VM)
ret = diag_get_dev_info(cdev->private->dev_id.devno,
&cdev->private->senseid);
else
/*
* If we can't couldn't identify the device type we
* consider the device "not operational".
*/
ret = -ENODEV;
ccw_device_sense_id_done(cdev, ret);
break;
}
CIO_MSG_EVENT(2, "snsid: device 0.%x.%04x: rc=%d %04x/%02x "
"%04x/%02x%s\n", id->ssid, id->devno, rc,
senseid->cu_type, senseid->cu_model, senseid->dev_type,
senseid->dev_model, vm ? " (diag210)" : "");
ccw_device_sense_id_done(cdev, rc);
}
/**
* ccw_device_sense_id_start - perform SENSE ID
* @cdev: ccw device
*
* Execute a SENSE ID channel program on @cdev to update its sense id
* information. When finished, call ccw_device_sense_id_done with a
* return code specifying the result.
*/
void ccw_device_sense_id_start(struct ccw_device *cdev)
{
struct subchannel *sch = to_subchannel(cdev->dev.parent);
struct ccw_request *req = &cdev->private->req;
struct ccw1 *cp = cdev->private->iccws;
CIO_TRACE_EVENT(4, "snsid");
CIO_HEX_EVENT(4, &cdev->private->dev_id, sizeof(cdev->private->dev_id));
/* Data setup. */
snsid_init(cdev);
/* Channel program setup. */
cp->cmd_code = CCW_CMD_SENSE_ID;
cp->cda = (u32) (addr_t) &cdev->private->senseid;
cp->count = sizeof(struct senseid);
cp->flags = CCW_FLAG_SLI;
/* Request setup. */
memset(req, 0, sizeof(*req));
req->cp = cp;
req->timeout = SENSE_ID_TIMEOUT;
req->maxretries = SENSE_ID_RETRIES;
req->lpm = sch->schib.pmcw.pam & sch->opm;
req->check = snsid_check;
req->callback = snsid_callback;
ccw_request_start(cdev);
}