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lastdragon
2026-09-06 12:53:21 -06:00
parent 662efe3c2a
commit ad2088d178
94853 changed files with 43200404 additions and 0 deletions
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linux-7.2.3/drivers/scsi/device_handler/Kconfig
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# SPDX-License-Identifier: GPL-2.0-only
#
# SCSI Device Handler configuration
#
menuconfig SCSI_DH
bool "SCSI Device Handlers"
depends on SCSI
default n
help
SCSI Device Handlers provide device specific support for
devices utilized in multipath configurations. Say Y here to
select support for specific hardware.
config SCSI_DH_RDAC
tristate "LSI RDAC Device Handler"
depends on SCSI_DH && SCSI
help
If you have a LSI RDAC select y. Otherwise, say N.
config SCSI_DH_HP_SW
tristate "HP/COMPAQ MSA Device Handler"
depends on SCSI_DH && SCSI
help
If you have a HP/COMPAQ MSA device that requires START_STOP to
be sent to start it and cannot upgrade the firmware then select y.
Otherwise, say N.
config SCSI_DH_EMC
tristate "EMC CLARiiON Device Handler"
depends on SCSI_DH && SCSI
help
If you have a EMC CLARiiON select y. Otherwise, say N.
config SCSI_DH_ALUA
tristate "SPC-3 ALUA Device Handler"
depends on SCSI_DH && SCSI
help
SCSI Device handler for generic SPC-3 Asymmetric Logical Unit
Access (ALUA).
linux-7.2.3/drivers/scsi/device_handler/Makefile
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# SPDX-License-Identifier: GPL-2.0-only
#
# SCSI Device Handler
#
obj-$(CONFIG_SCSI_DH_RDAC) += scsi_dh_rdac.o
obj-$(CONFIG_SCSI_DH_HP_SW) += scsi_dh_hp_sw.o
obj-$(CONFIG_SCSI_DH_EMC) += scsi_dh_emc.o
obj-$(CONFIG_SCSI_DH_ALUA) += scsi_dh_alua.o
linux-7.2.3/drivers/scsi/device_handler/scsi_dh_alua.c
+1328
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linux-7.2.3/drivers/scsi/device_handler/scsi_dh_emc.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Target driver for EMC CLARiiON AX/CX-series hardware.
* Based on code from Lars Marowsky-Bree <lmb@suse.de>
* and Ed Goggin <egoggin@emc.com>.
*
* Copyright (C) 2006 Red Hat, Inc. All rights reserved.
* Copyright (C) 2006 Mike Christie
*/
#include <linux/slab.h>
#include <linux/module.h>
#include <scsi/scsi.h>
#include <scsi/scsi_eh.h>
#include <scsi/scsi_dh.h>
#include <scsi/scsi_device.h>
#define CLARIION_NAME "emc"
#define CLARIION_TRESPASS_PAGE 0x22
#define CLARIION_BUFFER_SIZE 0xFC
#define CLARIION_TIMEOUT (60 * HZ)
#define CLARIION_RETRIES 3
#define CLARIION_UNBOUND_LU -1
#define CLARIION_SP_A 0
#define CLARIION_SP_B 1
/* Flags */
#define CLARIION_SHORT_TRESPASS 1
#define CLARIION_HONOR_RESERVATIONS 2
/* LUN states */
#define CLARIION_LUN_UNINITIALIZED -1
#define CLARIION_LUN_UNBOUND 0
#define CLARIION_LUN_BOUND 1
#define CLARIION_LUN_OWNED 2
static unsigned char long_trespass[] = {
0, 0, 0, 0, 0, 0, 0, 0,
CLARIION_TRESPASS_PAGE, /* Page code */
0x09, /* Page length - 2 */
0x01, /* Trespass code */
0xff, 0xff, /* Trespass target */
0, 0, 0, 0, 0, 0 /* Reserved bytes / unknown */
};
static unsigned char short_trespass[] = {
0, 0, 0, 0,
CLARIION_TRESPASS_PAGE, /* Page code */
0x02, /* Page length - 2 */
0x01, /* Trespass code */
0xff, /* Trespass target */
};
static const char * lun_state[] =
{
"not bound",
"bound",
"owned",
};
struct clariion_dh_data {
/*
* Flags:
* CLARIION_SHORT_TRESPASS
* Use short trespass command (FC-series) or the long version
* (default for AX/CX CLARiiON arrays).
*
* CLARIION_HONOR_RESERVATIONS
* Whether or not (default) to honor SCSI reservations when
* initiating a switch-over.
*/
unsigned flags;
/*
* I/O buffer for both MODE_SELECT and INQUIRY commands.
*/
unsigned char buffer[CLARIION_BUFFER_SIZE];
/*
* LUN state
*/
int lun_state;
/*
* SP Port number
*/
int port;
/*
* which SP (A=0,B=1,UNBOUND=-1) is the default SP for this
* path's mapped LUN
*/
int default_sp;
/*
* which SP (A=0,B=1,UNBOUND=-1) is the active SP for this
* path's mapped LUN
*/
int current_sp;
};
/*
* Parse MODE_SELECT cmd reply.
*/
static int trespass_endio(struct scsi_device *sdev,
struct scsi_sense_hdr *sshdr)
{
int err = SCSI_DH_IO;
sdev_printk(KERN_ERR, sdev, "%s: Found valid sense data 0x%2x, "
"0x%2x, 0x%2x while sending CLARiiON trespass "
"command.\n", CLARIION_NAME, sshdr->sense_key,
sshdr->asc, sshdr->ascq);
if (sshdr->sense_key == 0x05 && sshdr->asc == 0x04 &&
sshdr->ascq == 0x00) {
/*
* Array based copy in progress -- do not send
* mode_select or copy will be aborted mid-stream.
*/
sdev_printk(KERN_INFO, sdev, "%s: Array Based Copy in "
"progress while sending CLARiiON trespass "
"command.\n", CLARIION_NAME);
err = SCSI_DH_DEV_TEMP_BUSY;
} else if (sshdr->sense_key == 0x02 && sshdr->asc == 0x04 &&
sshdr->ascq == 0x03) {
/*
* LUN Not Ready - Manual Intervention Required
* indicates in-progress ucode upgrade (NDU).
*/
sdev_printk(KERN_INFO, sdev, "%s: Detected in-progress "
"ucode upgrade NDU operation while sending "
"CLARiiON trespass command.\n", CLARIION_NAME);
err = SCSI_DH_DEV_TEMP_BUSY;
} else
err = SCSI_DH_DEV_FAILED;
return err;
}
static int parse_sp_info_reply(struct scsi_device *sdev,
struct clariion_dh_data *csdev)
{
int err = SCSI_DH_OK;
/* check for in-progress ucode upgrade (NDU) */
if (csdev->buffer[48] != 0) {
sdev_printk(KERN_NOTICE, sdev, "%s: Detected in-progress "
"ucode upgrade NDU operation while finding "
"current active SP.", CLARIION_NAME);
err = SCSI_DH_DEV_TEMP_BUSY;
goto out;
}
if (csdev->buffer[4] > 2) {
/* Invalid buffer format */
sdev_printk(KERN_NOTICE, sdev,
"%s: invalid VPD page 0xC0 format\n",
CLARIION_NAME);
err = SCSI_DH_NOSYS;
goto out;
}
switch (csdev->buffer[28] & 0x0f) {
case 6:
sdev_printk(KERN_NOTICE, sdev,
"%s: ALUA failover mode detected\n",
CLARIION_NAME);
break;
case 4:
/* Linux failover */
break;
default:
sdev_printk(KERN_WARNING, sdev,
"%s: Invalid failover mode %d\n",
CLARIION_NAME, csdev->buffer[28] & 0x0f);
err = SCSI_DH_NOSYS;
goto out;
}
csdev->default_sp = csdev->buffer[5];
csdev->lun_state = csdev->buffer[4];
csdev->current_sp = csdev->buffer[8];
csdev->port = csdev->buffer[7];
if (csdev->lun_state == CLARIION_LUN_OWNED)
sdev->access_state = SCSI_ACCESS_STATE_OPTIMAL;
else
sdev->access_state = SCSI_ACCESS_STATE_STANDBY;
if (csdev->default_sp == csdev->current_sp)
sdev->access_state |= SCSI_ACCESS_STATE_PREFERRED;
out:
return err;
}
#define emc_default_str "FC (Legacy)"
static char * parse_sp_model(struct scsi_device *sdev, unsigned char *buffer)
{
unsigned char len = buffer[4] + 5;
char *sp_model = NULL;
unsigned char sp_len, serial_len;
if (len < 160) {
sdev_printk(KERN_WARNING, sdev,
"%s: Invalid information section length %d\n",
CLARIION_NAME, len);
/* Check for old FC arrays */
if (!strncmp(buffer + 8, "DGC", 3)) {
/* Old FC array, not supporting extended information */
sp_model = emc_default_str;
}
goto out;
}
/*
* Parse extended information for SP model number
*/
serial_len = buffer[160];
if (serial_len == 0 || serial_len + 161 > len) {
sdev_printk(KERN_WARNING, sdev,
"%s: Invalid array serial number length %d\n",
CLARIION_NAME, serial_len);
goto out;
}
sp_len = buffer[99];
if (sp_len == 0 || serial_len + sp_len + 161 > len) {
sdev_printk(KERN_WARNING, sdev,
"%s: Invalid model number length %d\n",
CLARIION_NAME, sp_len);
goto out;
}
sp_model = &buffer[serial_len + 161];
/* Strip whitespace at the end */
while (sp_len > 1 && sp_model[sp_len - 1] == ' ')
sp_len--;
sp_model[sp_len] = '\0';
out:
return sp_model;
}
static int send_trespass_cmd(struct scsi_device *sdev,
struct clariion_dh_data *csdev)
{
unsigned char *page22;
unsigned char cdb[MAX_COMMAND_SIZE];
int err, res = SCSI_DH_OK, len;
struct scsi_sense_hdr sshdr;
blk_opf_t opf = REQ_OP_DRV_OUT | REQ_FAILFAST_DEV |
REQ_FAILFAST_TRANSPORT | REQ_FAILFAST_DRIVER;
const struct scsi_exec_args exec_args = {
.sshdr = &sshdr,
};
if (csdev->flags & CLARIION_SHORT_TRESPASS) {
page22 = short_trespass;
if (!(csdev->flags & CLARIION_HONOR_RESERVATIONS))
/* Set Honor Reservations bit */
page22[6] |= 0x80;
len = sizeof(short_trespass);
cdb[0] = MODE_SELECT;
cdb[1] = 0x10;
cdb[4] = len;
} else {
page22 = long_trespass;
if (!(csdev->flags & CLARIION_HONOR_RESERVATIONS))
/* Set Honor Reservations bit */
page22[10] |= 0x80;
len = sizeof(long_trespass);
cdb[0] = MODE_SELECT_10;
cdb[8] = len;
}
BUG_ON((len > CLARIION_BUFFER_SIZE));
memcpy(csdev->buffer, page22, len);
err = scsi_execute_cmd(sdev, cdb, opf, csdev->buffer, len,
CLARIION_TIMEOUT * HZ, CLARIION_RETRIES,
&exec_args);
if (err) {
if (scsi_sense_valid(&sshdr))
res = trespass_endio(sdev, &sshdr);
else {
sdev_printk(KERN_INFO, sdev,
"%s: failed to send MODE SELECT: %x\n",
CLARIION_NAME, err);
res = SCSI_DH_IO;
}
}
return res;
}
static enum scsi_disposition clariion_check_sense(struct scsi_device *sdev,
struct scsi_sense_hdr *sense_hdr)
{
switch (sense_hdr->sense_key) {
case NOT_READY:
if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x03)
/*
* LUN Not Ready - Manual Intervention Required
* indicates this is a passive path.
*
* FIXME: However, if this is seen and EVPD C0
* indicates that this is due to a NDU in
* progress, we should set FAIL_PATH too.
* This indicates we might have to do a SCSI
* inquiry in the end_io path. Ugh.
*
* Can return FAILED only when we want the error
* recovery process to kick in.
*/
return SUCCESS;
break;
case ILLEGAL_REQUEST:
if (sense_hdr->asc == 0x25 && sense_hdr->ascq == 0x01)
/*
* An array based copy is in progress. Do not
* fail the path, do not bypass to another PG,
* do not retry. Fail the IO immediately.
* (Actually this is the same conclusion as in
* the default handler, but lets make sure.)
*
* Can return FAILED only when we want the error
* recovery process to kick in.
*/
return SUCCESS;
break;
case UNIT_ATTENTION:
if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00)
/*
* Unit Attention Code. This is the first IO
* to the new path, so just retry.
*/
return ADD_TO_MLQUEUE;
break;
}
return SCSI_RETURN_NOT_HANDLED;
}
static blk_status_t clariion_prep_fn(struct scsi_device *sdev,
struct request *req)
{
struct clariion_dh_data *h = sdev->handler_data;
if (h->lun_state != CLARIION_LUN_OWNED) {
req->rq_flags |= RQF_QUIET;
return BLK_STS_IOERR;
}
return BLK_STS_OK;
}
static int clariion_std_inquiry(struct scsi_device *sdev,
struct clariion_dh_data *csdev)
{
int err = SCSI_DH_OK;
char *sp_model;
sp_model = parse_sp_model(sdev, sdev->inquiry);
if (!sp_model) {
err = SCSI_DH_DEV_UNSUPP;
goto out;
}
/*
* FC Series arrays do not support long trespass
*/
if (!strlen(sp_model) || !strncmp(sp_model, "FC",2))
csdev->flags |= CLARIION_SHORT_TRESPASS;
sdev_printk(KERN_INFO, sdev,
"%s: detected Clariion %s, flags %x\n",
CLARIION_NAME, sp_model, csdev->flags);
out:
return err;
}
static int clariion_send_inquiry(struct scsi_device *sdev,
struct clariion_dh_data *csdev)
{
int err = SCSI_DH_IO;
if (!scsi_get_vpd_page(sdev, 0xC0, csdev->buffer,
CLARIION_BUFFER_SIZE))
err = parse_sp_info_reply(sdev, csdev);
return err;
}
static int clariion_activate(struct scsi_device *sdev,
activate_complete fn, void *data)
{
struct clariion_dh_data *csdev = sdev->handler_data;
int result;
result = clariion_send_inquiry(sdev, csdev);
if (result != SCSI_DH_OK)
goto done;
if (csdev->lun_state == CLARIION_LUN_OWNED)
goto done;
result = send_trespass_cmd(sdev, csdev);
if (result != SCSI_DH_OK)
goto done;
sdev_printk(KERN_INFO, sdev,"%s: %s trespass command sent\n",
CLARIION_NAME,
csdev->flags&CLARIION_SHORT_TRESPASS?"short":"long" );
/* Update status */
result = clariion_send_inquiry(sdev, csdev);
if (result != SCSI_DH_OK)
goto done;
done:
sdev_printk(KERN_INFO, sdev,
"%s: at SP %c Port %d (%s, default SP %c)\n",
CLARIION_NAME, csdev->current_sp + 'A',
csdev->port, lun_state[csdev->lun_state],
csdev->default_sp + 'A');
if (fn)
fn(data, result);
return 0;
}
/*
* params - parameters in the following format
* "no_of_params\0param1\0param2\0param3\0...\0"
* for example, string for 2 parameters with value 10 and 21
* is specified as "2\010\021\0".
*/
static int clariion_set_params(struct scsi_device *sdev, const char *params)
{
struct clariion_dh_data *csdev = sdev->handler_data;
unsigned int hr = 0, st = 0, argc;
const char *p = params;
int result = SCSI_DH_OK;
if ((sscanf(params, "%u", &argc) != 1) || (argc != 2))
return -EINVAL;
while (*p++)
;
if ((sscanf(p, "%u", &st) != 1) || (st > 1))
return -EINVAL;
while (*p++)
;
if ((sscanf(p, "%u", &hr) != 1) || (hr > 1))
return -EINVAL;
if (st)
csdev->flags |= CLARIION_SHORT_TRESPASS;
else
csdev->flags &= ~CLARIION_SHORT_TRESPASS;
if (hr)
csdev->flags |= CLARIION_HONOR_RESERVATIONS;
else
csdev->flags &= ~CLARIION_HONOR_RESERVATIONS;
/*
* If this path is owned, we have to send a trespass command
* with the new parameters. If not, simply return. Next trespass
* command would use the parameters.
*/
if (csdev->lun_state != CLARIION_LUN_OWNED)
goto done;
csdev->lun_state = CLARIION_LUN_UNINITIALIZED;
result = send_trespass_cmd(sdev, csdev);
if (result != SCSI_DH_OK)
goto done;
/* Update status */
result = clariion_send_inquiry(sdev, csdev);
done:
return result;
}
static int clariion_bus_attach(struct scsi_device *sdev)
{
struct clariion_dh_data *h;
int err;
h = kzalloc_obj(*h);
if (!h)
return SCSI_DH_NOMEM;
h->lun_state = CLARIION_LUN_UNINITIALIZED;
h->default_sp = CLARIION_UNBOUND_LU;
h->current_sp = CLARIION_UNBOUND_LU;
err = clariion_std_inquiry(sdev, h);
if (err != SCSI_DH_OK)
goto failed;
err = clariion_send_inquiry(sdev, h);
if (err != SCSI_DH_OK)
goto failed;
sdev_printk(KERN_INFO, sdev,
"%s: connected to SP %c Port %d (%s, default SP %c)\n",
CLARIION_NAME, h->current_sp + 'A',
h->port, lun_state[h->lun_state],
h->default_sp + 'A');
sdev->handler_data = h;
return SCSI_DH_OK;
failed:
kfree(h);
return err;
}
static void clariion_bus_detach(struct scsi_device *sdev)
{
kfree(sdev->handler_data);
sdev->handler_data = NULL;
}
static struct scsi_device_handler clariion_dh = {
.name = CLARIION_NAME,
.module = THIS_MODULE,
.attach = clariion_bus_attach,
.detach = clariion_bus_detach,
.check_sense = clariion_check_sense,
.activate = clariion_activate,
.prep_fn = clariion_prep_fn,
.set_params = clariion_set_params,
};
static int __init clariion_init(void)
{
int r;
r = scsi_register_device_handler(&clariion_dh);
if (r != 0)
printk(KERN_ERR "%s: Failed to register scsi device handler.",
CLARIION_NAME);
return r;
}
static void __exit clariion_exit(void)
{
scsi_unregister_device_handler(&clariion_dh);
}
module_init(clariion_init);
module_exit(clariion_exit);
MODULE_DESCRIPTION("EMC CX/AX/FC-family driver");
MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, Chandra Seetharaman <sekharan@us.ibm.com>");
MODULE_LICENSE("GPL");
linux-7.2.3/drivers/scsi/device_handler/scsi_dh_hp_sw.c
+285
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@@ -0,0 +1,285 @@
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Basic HP/COMPAQ MSA 1000 support. This is only needed if your HW cannot be
* upgraded.
*
* Copyright (C) 2006 Red Hat, Inc. All rights reserved.
* Copyright (C) 2006 Mike Christie
* Copyright (C) 2008 Hannes Reinecke <hare@suse.de>
*/
#include <linux/slab.h>
#include <linux/module.h>
#include <scsi/scsi.h>
#include <scsi/scsi_dbg.h>
#include <scsi/scsi_eh.h>
#include <scsi/scsi_dh.h>
#define HP_SW_NAME "hp_sw"
#define HP_SW_TIMEOUT (60 * HZ)
#define HP_SW_RETRIES 3
#define HP_SW_PATH_UNINITIALIZED -1
#define HP_SW_PATH_ACTIVE 0
#define HP_SW_PATH_PASSIVE 1
struct hp_sw_dh_data {
int path_state;
int retries;
int retry_cnt;
struct scsi_device *sdev;
};
static int hp_sw_start_stop(struct hp_sw_dh_data *);
/*
* tur_done - Handle TEST UNIT READY return status
* @sdev: sdev the command has been sent to
* @errors: blk error code
*
* Returns SCSI_DH_DEV_OFFLINED if the sdev is on the passive path
*/
static int tur_done(struct scsi_device *sdev, struct hp_sw_dh_data *h,
struct scsi_sense_hdr *sshdr)
{
int ret = SCSI_DH_IO;
switch (sshdr->sense_key) {
case NOT_READY:
if (sshdr->asc == 0x04 && sshdr->ascq == 2) {
/*
* LUN not ready - Initialization command required
*
* This is the passive path
*/
h->path_state = HP_SW_PATH_PASSIVE;
ret = SCSI_DH_OK;
break;
}
fallthrough;
default:
sdev_printk(KERN_WARNING, sdev,
"%s: sending tur failed, sense %x/%x/%x\n",
HP_SW_NAME, sshdr->sense_key, sshdr->asc,
sshdr->ascq);
break;
}
return ret;
}
/*
* hp_sw_tur - Send TEST UNIT READY
* @sdev: sdev command should be sent to
*
* Use the TEST UNIT READY command to determine
* the path state.
*/
static int hp_sw_tur(struct scsi_device *sdev, struct hp_sw_dh_data *h)
{
unsigned char cmd[6] = { TEST_UNIT_READY };
struct scsi_sense_hdr sshdr;
int ret, res;
blk_opf_t opf = REQ_OP_DRV_IN | REQ_FAILFAST_DEV |
REQ_FAILFAST_TRANSPORT | REQ_FAILFAST_DRIVER;
struct scsi_failure failure_defs[] = {
{
.sense = UNIT_ATTENTION,
.asc = SCMD_FAILURE_ASC_ANY,
.ascq = SCMD_FAILURE_ASCQ_ANY,
.allowed = SCMD_FAILURE_NO_LIMIT,
.result = SAM_STAT_CHECK_CONDITION,
},
{}
};
struct scsi_failures failures = {
.failure_definitions = failure_defs,
};
const struct scsi_exec_args exec_args = {
.sshdr = &sshdr,
.failures = &failures,
};
res = scsi_execute_cmd(sdev, cmd, opf, NULL, 0, HP_SW_TIMEOUT,
HP_SW_RETRIES, &exec_args);
if (res > 0 && scsi_sense_valid(&sshdr)) {
ret = tur_done(sdev, h, &sshdr);
} else if (res == 0) {
h->path_state = HP_SW_PATH_ACTIVE;
ret = SCSI_DH_OK;
} else {
sdev_printk(KERN_WARNING, sdev,
"%s: sending tur failed with %x\n",
HP_SW_NAME, res);
ret = SCSI_DH_IO;
}
return ret;
}
/*
* hp_sw_start_stop - Send START STOP UNIT command
* @sdev: sdev command should be sent to
*
* Sending START STOP UNIT activates the SP.
*/
static int hp_sw_start_stop(struct hp_sw_dh_data *h)
{
unsigned char cmd[6] = { START_STOP, 0, 0, 0, 1, 0 };
struct scsi_sense_hdr sshdr;
struct scsi_device *sdev = h->sdev;
int res, rc;
blk_opf_t opf = REQ_OP_DRV_IN | REQ_FAILFAST_DEV |
REQ_FAILFAST_TRANSPORT | REQ_FAILFAST_DRIVER;
struct scsi_failure failure_defs[] = {
{
/*
* LUN not ready - manual intervention required
*
* Switch-over in progress, retry.
*/
.sense = NOT_READY,
.asc = 0x04,
.ascq = 0x03,
.allowed = HP_SW_RETRIES,
.result = SAM_STAT_CHECK_CONDITION,
},
{}
};
struct scsi_failures failures = {
.failure_definitions = failure_defs,
};
const struct scsi_exec_args exec_args = {
.sshdr = &sshdr,
.failures = &failures,
};
res = scsi_execute_cmd(sdev, cmd, opf, NULL, 0, HP_SW_TIMEOUT,
HP_SW_RETRIES, &exec_args);
if (!res) {
return SCSI_DH_OK;
} else if (res < 0 || !scsi_sense_valid(&sshdr)) {
sdev_printk(KERN_WARNING, sdev,
"%s: sending start_stop_unit failed, "
"no sense available\n", HP_SW_NAME);
return SCSI_DH_IO;
}
switch (sshdr.sense_key) {
case NOT_READY:
if (sshdr.asc == 0x04 && sshdr.ascq == 3) {
rc = SCSI_DH_RETRY;
break;
}
fallthrough;
default:
sdev_printk(KERN_WARNING, sdev,
"%s: sending start_stop_unit failed, "
"sense %x/%x/%x\n", HP_SW_NAME,
sshdr.sense_key, sshdr.asc, sshdr.ascq);
rc = SCSI_DH_IO;
}
return rc;
}
static blk_status_t hp_sw_prep_fn(struct scsi_device *sdev, struct request *req)
{
struct hp_sw_dh_data *h = sdev->handler_data;
if (h->path_state != HP_SW_PATH_ACTIVE) {
req->rq_flags |= RQF_QUIET;
return BLK_STS_IOERR;
}
return BLK_STS_OK;
}
/*
* hp_sw_activate - Activate a path
* @sdev: sdev on the path to be activated
*
* The HP Active/Passive firmware is pretty simple;
* the passive path reports NOT READY with sense codes
* 0x04/0x02; a START STOP UNIT command will then
* activate the passive path (and deactivate the
* previously active one).
*/
static int hp_sw_activate(struct scsi_device *sdev,
activate_complete fn, void *data)
{
int ret = SCSI_DH_OK;
struct hp_sw_dh_data *h = sdev->handler_data;
ret = hp_sw_tur(sdev, h);
if (ret == SCSI_DH_OK && h->path_state == HP_SW_PATH_PASSIVE)
ret = hp_sw_start_stop(h);
if (fn)
fn(data, ret);
return 0;
}
static int hp_sw_bus_attach(struct scsi_device *sdev)
{
struct hp_sw_dh_data *h;
int ret;
h = kzalloc_obj(*h);
if (!h)
return SCSI_DH_NOMEM;
h->path_state = HP_SW_PATH_UNINITIALIZED;
h->retries = HP_SW_RETRIES;
h->sdev = sdev;
ret = hp_sw_tur(sdev, h);
if (ret != SCSI_DH_OK)
goto failed;
if (h->path_state == HP_SW_PATH_UNINITIALIZED) {
ret = SCSI_DH_NOSYS;
goto failed;
}
sdev_printk(KERN_INFO, sdev, "%s: attached to %s path\n",
HP_SW_NAME, h->path_state == HP_SW_PATH_ACTIVE?
"active":"passive");
sdev->handler_data = h;
return SCSI_DH_OK;
failed:
kfree(h);
return ret;
}
static void hp_sw_bus_detach( struct scsi_device *sdev )
{
kfree(sdev->handler_data);
sdev->handler_data = NULL;
}
static struct scsi_device_handler hp_sw_dh = {
.name = HP_SW_NAME,
.module = THIS_MODULE,
.attach = hp_sw_bus_attach,
.detach = hp_sw_bus_detach,
.activate = hp_sw_activate,
.prep_fn = hp_sw_prep_fn,
};
static int __init hp_sw_init(void)
{
return scsi_register_device_handler(&hp_sw_dh);
}
static void __exit hp_sw_exit(void)
{
scsi_unregister_device_handler(&hp_sw_dh);
}
module_init(hp_sw_init);
module_exit(hp_sw_exit);
MODULE_DESCRIPTION("HP Active/Passive driver");
MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu");
MODULE_LICENSE("GPL");
linux-7.2.3/drivers/scsi/device_handler/scsi_dh_rdac.c
+849
View File
@@ -0,0 +1,849 @@
/*
* LSI/Engenio/NetApp E-Series RDAC SCSI Device Handler
*
* Copyright (C) 2005 Mike Christie. All rights reserved.
* Copyright (C) Chandra Seetharaman, IBM Corp. 2007
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
*/
#include <scsi/scsi.h>
#include <scsi/scsi_eh.h>
#include <scsi/scsi_dh.h>
#include <linux/workqueue.h>
#include <linux/slab.h>
#include <linux/module.h>
#define RDAC_NAME "rdac"
#define RDAC_RETRY_COUNT 5
/*
* LSI mode page stuff
*
* These struct definitions and the forming of the
* mode page were taken from the LSI RDAC 2.4 GPL'd
* driver, and then converted to Linux conventions.
*/
#define RDAC_QUIESCENCE_TIME 20
/*
* Page Codes
*/
#define RDAC_PAGE_CODE_REDUNDANT_CONTROLLER 0x2c
/*
* Controller modes definitions
*/
#define RDAC_MODE_TRANSFER_SPECIFIED_LUNS 0x02
/*
* RDAC Options field
*/
#define RDAC_FORCED_QUIESENCE 0x02
#define RDAC_TIMEOUT (60 * HZ)
#define RDAC_RETRIES 3
struct rdac_mode_6_hdr {
u8 data_len;
u8 medium_type;
u8 device_params;
u8 block_desc_len;
};
struct rdac_mode_10_hdr {
u16 data_len;
u8 medium_type;
u8 device_params;
u16 reserved;
u16 block_desc_len;
};
struct rdac_mode_common {
u8 controller_serial[16];
u8 alt_controller_serial[16];
u8 rdac_mode[2];
u8 alt_rdac_mode[2];
u8 quiescence_timeout;
u8 rdac_options;
};
struct rdac_pg_legacy {
struct rdac_mode_6_hdr hdr;
u8 page_code;
u8 page_len;
struct rdac_mode_common common;
#define MODE6_MAX_LUN 32
u8 lun_table[MODE6_MAX_LUN];
u8 reserved2[32];
u8 reserved3;
u8 reserved4;
};
struct rdac_pg_expanded {
struct rdac_mode_10_hdr hdr;
u8 page_code;
u8 subpage_code;
u8 page_len[2];
struct rdac_mode_common common;
u8 lun_table[256];
u8 reserved3;
u8 reserved4;
};
struct c9_inquiry {
u8 peripheral_info;
u8 page_code; /* 0xC9 */
u8 reserved1;
u8 page_len;
u8 page_id[4]; /* "vace" */
u8 avte_cvp;
u8 path_prio;
u8 reserved2[38];
};
#define SUBSYS_ID_LEN 16
#define SLOT_ID_LEN 2
#define ARRAY_LABEL_LEN 31
struct c4_inquiry {
u8 peripheral_info;
u8 page_code; /* 0xC4 */
u8 reserved1;
u8 page_len;
u8 page_id[4]; /* "subs" */
u8 subsys_id[SUBSYS_ID_LEN];
u8 revision[4];
u8 slot_id[SLOT_ID_LEN];
u8 reserved[2];
};
#define UNIQUE_ID_LEN 16
struct c8_inquiry {
u8 peripheral_info;
u8 page_code; /* 0xC8 */
u8 reserved1;
u8 page_len;
u8 page_id[4]; /* "edid" */
u8 reserved2[3];
u8 vol_uniq_id_len;
u8 vol_uniq_id[16];
u8 vol_user_label_len;
u8 vol_user_label[60];
u8 array_uniq_id_len;
u8 array_unique_id[UNIQUE_ID_LEN];
u8 array_user_label_len;
u8 array_user_label[60];
u8 lun[8];
};
struct rdac_controller {
u8 array_id[UNIQUE_ID_LEN];
int use_ms10;
struct kref kref;
struct list_head node; /* list of all controllers */
union {
struct rdac_pg_legacy legacy;
struct rdac_pg_expanded expanded;
} mode_select;
u8 index;
u8 array_name[ARRAY_LABEL_LEN];
struct Scsi_Host *host;
spinlock_t ms_lock;
int ms_queued;
struct work_struct ms_work;
struct scsi_device *ms_sdev;
struct list_head ms_head;
struct list_head dh_list;
};
struct c2_inquiry {
u8 peripheral_info;
u8 page_code; /* 0xC2 */
u8 reserved1;
u8 page_len;
u8 page_id[4]; /* "swr4" */
u8 sw_version[3];
u8 sw_date[3];
u8 features_enabled;
u8 max_lun_supported;
u8 partitions[239]; /* Total allocation length should be 0xFF */
};
struct rdac_dh_data {
struct list_head node;
struct rdac_controller *ctlr;
struct scsi_device *sdev;
#define UNINITIALIZED_LUN (1 << 8)
unsigned lun;
#define RDAC_MODE 0
#define RDAC_MODE_AVT 1
#define RDAC_MODE_IOSHIP 2
unsigned char mode;
#define RDAC_STATE_ACTIVE 0
#define RDAC_STATE_PASSIVE 1
unsigned char state;
#define RDAC_LUN_UNOWNED 0
#define RDAC_LUN_OWNED 1
char lun_state;
#define RDAC_PREFERRED 0
#define RDAC_NON_PREFERRED 1
char preferred;
union {
struct c2_inquiry c2;
struct c4_inquiry c4;
struct c8_inquiry c8;
struct c9_inquiry c9;
} inq;
};
static const char *mode[] = {
"RDAC",
"AVT",
"IOSHIP",
};
static const char *lun_state[] =
{
"unowned",
"owned",
};
struct rdac_queue_data {
struct list_head entry;
struct rdac_dh_data *h;
activate_complete callback_fn;
void *callback_data;
};
static LIST_HEAD(ctlr_list);
static DEFINE_SPINLOCK(list_lock);
static struct workqueue_struct *kmpath_rdacd;
static void send_mode_select(struct work_struct *work);
/*
* module parameter to enable rdac debug logging.
* 2 bits for each type of logging, only two types defined for now
* Can be enhanced if required at later point
*/
static int rdac_logging = 1;
module_param(rdac_logging, int, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(rdac_logging, "A bit mask of rdac logging levels, "
"Default is 1 - failover logging enabled, "
"set it to 0xF to enable all the logs");
#define RDAC_LOG_FAILOVER 0
#define RDAC_LOG_SENSE 2
#define RDAC_LOG_BITS 2
#define RDAC_LOG_LEVEL(SHIFT) \
((rdac_logging >> (SHIFT)) & ((1 << (RDAC_LOG_BITS)) - 1))
#define RDAC_LOG(SHIFT, sdev, f, arg...) \
do { \
if (unlikely(RDAC_LOG_LEVEL(SHIFT))) \
sdev_printk(KERN_INFO, sdev, RDAC_NAME ": " f "\n", ## arg); \
} while (0);
static unsigned int rdac_failover_get(struct rdac_controller *ctlr,
struct list_head *list,
unsigned char *cdb)
{
struct rdac_mode_common *common;
unsigned data_size;
struct rdac_queue_data *qdata;
u8 *lun_table;
if (ctlr->use_ms10) {
struct rdac_pg_expanded *rdac_pg;
data_size = sizeof(struct rdac_pg_expanded);
rdac_pg = &ctlr->mode_select.expanded;
memset(rdac_pg, 0, data_size);
common = &rdac_pg->common;
rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER + 0x40;
rdac_pg->subpage_code = 0x1;
rdac_pg->page_len[0] = 0x01;
rdac_pg->page_len[1] = 0x28;
lun_table = rdac_pg->lun_table;
} else {
struct rdac_pg_legacy *rdac_pg;
data_size = sizeof(struct rdac_pg_legacy);
rdac_pg = &ctlr->mode_select.legacy;
memset(rdac_pg, 0, data_size);
common = &rdac_pg->common;
rdac_pg->page_code = RDAC_PAGE_CODE_REDUNDANT_CONTROLLER;
rdac_pg->page_len = 0x68;
lun_table = rdac_pg->lun_table;
}
common->rdac_mode[1] = RDAC_MODE_TRANSFER_SPECIFIED_LUNS;
common->quiescence_timeout = RDAC_QUIESCENCE_TIME;
common->rdac_options = RDAC_FORCED_QUIESENCE;
list_for_each_entry(qdata, list, entry) {
lun_table[qdata->h->lun] = 0x81;
}
/* Prepare the command. */
if (ctlr->use_ms10) {
cdb[0] = MODE_SELECT_10;
cdb[7] = data_size >> 8;
cdb[8] = data_size & 0xff;
} else {
cdb[0] = MODE_SELECT;
cdb[4] = data_size;
}
return data_size;
}
static void release_controller(struct kref *kref)
{
struct rdac_controller *ctlr;
ctlr = container_of(kref, struct rdac_controller, kref);
list_del(&ctlr->node);
kfree(ctlr);
}
static struct rdac_controller *get_controller(int index, char *array_name,
u8 *array_id, struct scsi_device *sdev)
{
struct rdac_controller *ctlr, *tmp;
list_for_each_entry(tmp, &ctlr_list, node) {
if ((memcmp(tmp->array_id, array_id, UNIQUE_ID_LEN) == 0) &&
(tmp->index == index) &&
(tmp->host == sdev->host)) {
kref_get(&tmp->kref);
return tmp;
}
}
ctlr = kmalloc_obj(*ctlr, GFP_ATOMIC);
if (!ctlr)
return NULL;
/* initialize fields of controller */
memcpy(ctlr->array_id, array_id, UNIQUE_ID_LEN);
ctlr->index = index;
ctlr->host = sdev->host;
memcpy(ctlr->array_name, array_name, ARRAY_LABEL_LEN);
kref_init(&ctlr->kref);
ctlr->use_ms10 = -1;
ctlr->ms_queued = 0;
ctlr->ms_sdev = NULL;
spin_lock_init(&ctlr->ms_lock);
INIT_WORK(&ctlr->ms_work, send_mode_select);
INIT_LIST_HEAD(&ctlr->ms_head);
list_add(&ctlr->node, &ctlr_list);
INIT_LIST_HEAD(&ctlr->dh_list);
return ctlr;
}
static int get_lun_info(struct scsi_device *sdev, struct rdac_dh_data *h,
char *array_name, u8 *array_id)
{
int err = SCSI_DH_IO, i;
struct c8_inquiry *inqp = &h->inq.c8;
if (!scsi_get_vpd_page(sdev, 0xC8, (unsigned char *)inqp,
sizeof(struct c8_inquiry))) {
if (inqp->page_code != 0xc8)
return SCSI_DH_NOSYS;
if (inqp->page_id[0] != 'e' || inqp->page_id[1] != 'd' ||
inqp->page_id[2] != 'i' || inqp->page_id[3] != 'd')
return SCSI_DH_NOSYS;
h->lun = inqp->lun[7]; /* Uses only the last byte */
for(i=0; i<ARRAY_LABEL_LEN-1; ++i)
*(array_name+i) = inqp->array_user_label[(2*i)+1];
*(array_name+ARRAY_LABEL_LEN-1) = '\0';
memset(array_id, 0, UNIQUE_ID_LEN);
memcpy(array_id, inqp->array_unique_id, inqp->array_uniq_id_len);
err = SCSI_DH_OK;
}
return err;
}
static int check_ownership(struct scsi_device *sdev, struct rdac_dh_data *h)
{
int err = SCSI_DH_IO, access_state;
struct rdac_dh_data *tmp;
struct c9_inquiry *inqp = &h->inq.c9;
h->state = RDAC_STATE_ACTIVE;
if (!scsi_get_vpd_page(sdev, 0xC9, (unsigned char *)inqp,
sizeof(struct c9_inquiry))) {
/* detect the operating mode */
if ((inqp->avte_cvp >> 5) & 0x1)
h->mode = RDAC_MODE_IOSHIP; /* LUN in IOSHIP mode */
else if (inqp->avte_cvp >> 7)
h->mode = RDAC_MODE_AVT; /* LUN in AVT mode */
else
h->mode = RDAC_MODE; /* LUN in RDAC mode */
/* Update ownership */
if (inqp->avte_cvp & 0x1) {
h->lun_state = RDAC_LUN_OWNED;
access_state = SCSI_ACCESS_STATE_OPTIMAL;
} else {
h->lun_state = RDAC_LUN_UNOWNED;
if (h->mode == RDAC_MODE) {
h->state = RDAC_STATE_PASSIVE;
access_state = SCSI_ACCESS_STATE_STANDBY;
} else
access_state = SCSI_ACCESS_STATE_ACTIVE;
}
/* Update path prio*/
if (inqp->path_prio & 0x1) {
h->preferred = RDAC_PREFERRED;
access_state |= SCSI_ACCESS_STATE_PREFERRED;
} else
h->preferred = RDAC_NON_PREFERRED;
rcu_read_lock();
list_for_each_entry_rcu(tmp, &h->ctlr->dh_list, node) {
/* h->sdev should always be valid */
BUG_ON(!tmp->sdev);
tmp->sdev->access_state = access_state;
}
rcu_read_unlock();
err = SCSI_DH_OK;
}
return err;
}
static int initialize_controller(struct scsi_device *sdev,
struct rdac_dh_data *h, char *array_name, u8 *array_id)
{
int err = SCSI_DH_IO, index;
struct c4_inquiry *inqp = &h->inq.c4;
if (!scsi_get_vpd_page(sdev, 0xC4, (unsigned char *)inqp,
sizeof(struct c4_inquiry))) {
/* get the controller index */
if (inqp->slot_id[1] == 0x31)
index = 0;
else
index = 1;
spin_lock(&list_lock);
h->ctlr = get_controller(index, array_name, array_id, sdev);
if (!h->ctlr)
err = SCSI_DH_RES_TEMP_UNAVAIL;
else {
h->sdev = sdev;
list_add_rcu(&h->node, &h->ctlr->dh_list);
}
spin_unlock(&list_lock);
err = SCSI_DH_OK;
}
return err;
}
static int set_mode_select(struct scsi_device *sdev, struct rdac_dh_data *h)
{
int err = SCSI_DH_IO;
struct c2_inquiry *inqp = &h->inq.c2;
if (!scsi_get_vpd_page(sdev, 0xC2, (unsigned char *)inqp,
sizeof(struct c2_inquiry))) {
/*
* If more than MODE6_MAX_LUN luns are supported, use
* mode select 10
*/
if (inqp->max_lun_supported >= MODE6_MAX_LUN)
h->ctlr->use_ms10 = 1;
else
h->ctlr->use_ms10 = 0;
err = SCSI_DH_OK;
}
return err;
}
static int mode_select_handle_sense(struct scsi_device *sdev,
struct scsi_sense_hdr *sense_hdr)
{
struct rdac_dh_data *h = sdev->handler_data;
if (!scsi_sense_valid(sense_hdr))
return SCSI_DH_IO;
RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, "
"MODE_SELECT returned with sense %02x/%02x/%02x",
(char *) h->ctlr->array_name, h->ctlr->index,
sense_hdr->sense_key, sense_hdr->asc, sense_hdr->ascq);
return SCSI_DH_IO;
}
static void send_mode_select(struct work_struct *work)
{
struct rdac_controller *ctlr =
container_of(work, struct rdac_controller, ms_work);
struct scsi_device *sdev = ctlr->ms_sdev;
struct rdac_dh_data *h = sdev->handler_data;
int rc, err;
struct rdac_queue_data *tmp, *qdata;
LIST_HEAD(list);
unsigned char cdb[MAX_COMMAND_SIZE];
struct scsi_sense_hdr sshdr;
unsigned int data_size;
blk_opf_t opf = REQ_OP_DRV_OUT | REQ_FAILFAST_DEV |
REQ_FAILFAST_TRANSPORT | REQ_FAILFAST_DRIVER;
struct scsi_failure failure_defs[] = {
{
.sense = NO_SENSE,
.asc = SCMD_FAILURE_ASC_ANY,
.ascq = SCMD_FAILURE_ASCQ_ANY,
.result = SAM_STAT_CHECK_CONDITION,
},
{
.sense = ABORTED_COMMAND,
.asc = SCMD_FAILURE_ASC_ANY,
.ascq = SCMD_FAILURE_ASCQ_ANY,
.result = SAM_STAT_CHECK_CONDITION,
},
{
.sense = UNIT_ATTENTION,
.asc = SCMD_FAILURE_ASC_ANY,
.ascq = SCMD_FAILURE_ASCQ_ANY,
.result = SAM_STAT_CHECK_CONDITION,
},
/* LUN Not Ready and is in the Process of Becoming Ready */
{
.sense = NOT_READY,
.asc = 0x04,
.ascq = 0x01,
.result = SAM_STAT_CHECK_CONDITION,
},
/* Command Lock contention */
{
.sense = ILLEGAL_REQUEST,
.asc = 0x91,
.ascq = 0x36,
.allowed = SCMD_FAILURE_NO_LIMIT,
.result = SAM_STAT_CHECK_CONDITION,
},
{}
};
struct scsi_failures failures = {
.total_allowed = RDAC_RETRY_COUNT,
.failure_definitions = failure_defs,
};
const struct scsi_exec_args exec_args = {
.sshdr = &sshdr,
.failures = &failures,
};
spin_lock(&ctlr->ms_lock);
list_splice_init(&ctlr->ms_head, &list);
ctlr->ms_queued = 0;
ctlr->ms_sdev = NULL;
spin_unlock(&ctlr->ms_lock);
memset(cdb, 0, sizeof(cdb));
data_size = rdac_failover_get(ctlr, &list, cdb);
RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, queueing MODE_SELECT command",
(char *)h->ctlr->array_name, h->ctlr->index);
rc = scsi_execute_cmd(sdev, cdb, opf, &h->ctlr->mode_select, data_size,
RDAC_TIMEOUT * HZ, RDAC_RETRIES, &exec_args);
if (!rc) {
h->state = RDAC_STATE_ACTIVE;
RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, "
"MODE_SELECT completed",
(char *) h->ctlr->array_name, h->ctlr->index);
err = SCSI_DH_OK;
} else if (rc < 0) {
err = SCSI_DH_IO;
} else {
err = mode_select_handle_sense(sdev, &sshdr);
}
list_for_each_entry_safe(qdata, tmp, &list, entry) {
list_del(&qdata->entry);
if (err == SCSI_DH_OK)
qdata->h->state = RDAC_STATE_ACTIVE;
if (qdata->callback_fn)
qdata->callback_fn(qdata->callback_data, err);
kfree(qdata);
}
return;
}
static int queue_mode_select(struct scsi_device *sdev,
activate_complete fn, void *data)
{
struct rdac_queue_data *qdata;
struct rdac_controller *ctlr;
qdata = kzalloc_obj(*qdata);
if (!qdata)
return SCSI_DH_RETRY;
qdata->h = sdev->handler_data;
qdata->callback_fn = fn;
qdata->callback_data = data;
ctlr = qdata->h->ctlr;
spin_lock(&ctlr->ms_lock);
list_add_tail(&qdata->entry, &ctlr->ms_head);
if (!ctlr->ms_queued) {
ctlr->ms_queued = 1;
ctlr->ms_sdev = sdev;
queue_work(kmpath_rdacd, &ctlr->ms_work);
}
spin_unlock(&ctlr->ms_lock);
return SCSI_DH_OK;
}
static int rdac_activate(struct scsi_device *sdev,
activate_complete fn, void *data)
{
struct rdac_dh_data *h = sdev->handler_data;
int err = SCSI_DH_OK;
int act = 0;
err = check_ownership(sdev, h);
if (err != SCSI_DH_OK)
goto done;
switch (h->mode) {
case RDAC_MODE:
if (h->lun_state == RDAC_LUN_UNOWNED)
act = 1;
break;
case RDAC_MODE_IOSHIP:
if ((h->lun_state == RDAC_LUN_UNOWNED) &&
(h->preferred == RDAC_PREFERRED))
act = 1;
break;
default:
break;
}
if (act) {
err = queue_mode_select(sdev, fn, data);
if (err == SCSI_DH_OK)
return 0;
}
done:
if (fn)
fn(data, err);
return 0;
}
static blk_status_t rdac_prep_fn(struct scsi_device *sdev, struct request *req)
{
struct rdac_dh_data *h = sdev->handler_data;
if (h->state != RDAC_STATE_ACTIVE) {
req->rq_flags |= RQF_QUIET;
return BLK_STS_IOERR;
}
return BLK_STS_OK;
}
static enum scsi_disposition rdac_check_sense(struct scsi_device *sdev,
struct scsi_sense_hdr *sense_hdr)
{
struct rdac_dh_data *h = sdev->handler_data;
RDAC_LOG(RDAC_LOG_SENSE, sdev, "array %s, ctlr %d, "
"I/O returned with sense %02x/%02x/%02x",
(char *) h->ctlr->array_name, h->ctlr->index,
sense_hdr->sense_key, sense_hdr->asc, sense_hdr->ascq);
switch (sense_hdr->sense_key) {
case NOT_READY:
if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x01)
/* LUN Not Ready - Logical Unit Not Ready and is in
* the process of becoming ready
* Just retry.
*/
return ADD_TO_MLQUEUE;
if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x81)
/* LUN Not Ready - Storage firmware incompatible
* Manual code synchonisation required.
*
* Nothing we can do here. Try to bypass the path.
*/
return SUCCESS;
if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0xA1)
/* LUN Not Ready - Quiescense in progress
*
* Just retry and wait.
*/
return ADD_TO_MLQUEUE;
if (sense_hdr->asc == 0xA1 && sense_hdr->ascq == 0x02)
/* LUN Not Ready - Quiescense in progress
* or has been achieved
* Just retry.
*/
return ADD_TO_MLQUEUE;
break;
case ILLEGAL_REQUEST:
if (sense_hdr->asc == 0x94 && sense_hdr->ascq == 0x01) {
/* Invalid Request - Current Logical Unit Ownership.
* Controller is not the current owner of the LUN,
* Fail the path, so that the other path be used.
*/
h->state = RDAC_STATE_PASSIVE;
return SUCCESS;
}
break;
case UNIT_ATTENTION:
if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00)
/*
* Power On, Reset, or Bus Device Reset, just retry.
*/
return ADD_TO_MLQUEUE;
if (sense_hdr->asc == 0x8b && sense_hdr->ascq == 0x02)
/*
* Quiescence in progress , just retry.
*/
return ADD_TO_MLQUEUE;
break;
}
/* success just means we do not care what scsi-ml does */
return SCSI_RETURN_NOT_HANDLED;
}
static int rdac_bus_attach(struct scsi_device *sdev)
{
struct rdac_dh_data *h;
int err;
char array_name[ARRAY_LABEL_LEN];
char array_id[UNIQUE_ID_LEN];
h = kzalloc_obj(*h);
if (!h)
return SCSI_DH_NOMEM;
h->lun = UNINITIALIZED_LUN;
h->state = RDAC_STATE_ACTIVE;
err = get_lun_info(sdev, h, array_name, array_id);
if (err != SCSI_DH_OK)
goto failed;
err = initialize_controller(sdev, h, array_name, array_id);
if (err != SCSI_DH_OK)
goto failed;
err = check_ownership(sdev, h);
if (err != SCSI_DH_OK)
goto clean_ctlr;
err = set_mode_select(sdev, h);
if (err != SCSI_DH_OK)
goto clean_ctlr;
sdev_printk(KERN_NOTICE, sdev,
"%s: LUN %d (%s) (%s)\n",
RDAC_NAME, h->lun, mode[(int)h->mode],
lun_state[(int)h->lun_state]);
sdev->handler_data = h;
return SCSI_DH_OK;
clean_ctlr:
spin_lock(&list_lock);
kref_put(&h->ctlr->kref, release_controller);
spin_unlock(&list_lock);
failed:
kfree(h);
return err;
}
static void rdac_bus_detach( struct scsi_device *sdev )
{
struct rdac_dh_data *h = sdev->handler_data;
if (h->ctlr && h->ctlr->ms_queued)
flush_workqueue(kmpath_rdacd);
spin_lock(&list_lock);
if (h->ctlr) {
list_del_rcu(&h->node);
kref_put(&h->ctlr->kref, release_controller);
}
spin_unlock(&list_lock);
sdev->handler_data = NULL;
synchronize_rcu();
kfree(h);
}
static struct scsi_device_handler rdac_dh = {
.name = RDAC_NAME,
.module = THIS_MODULE,
.prep_fn = rdac_prep_fn,
.check_sense = rdac_check_sense,
.attach = rdac_bus_attach,
.detach = rdac_bus_detach,
.activate = rdac_activate,
};
static int __init rdac_init(void)
{
int r;
r = scsi_register_device_handler(&rdac_dh);
if (r != 0) {
printk(KERN_ERR "Failed to register scsi device handler.");
goto done;
}
/*
* Create workqueue to handle mode selects for rdac
*/
kmpath_rdacd =
alloc_ordered_workqueue("%s", WQ_MEM_RECLAIM, "kmpath_rdacd");
if (!kmpath_rdacd) {
scsi_unregister_device_handler(&rdac_dh);
printk(KERN_ERR "kmpath_rdacd creation failed.\n");
r = -EINVAL;
}
done:
return r;
}
static void __exit rdac_exit(void)
{
destroy_workqueue(kmpath_rdacd);
scsi_unregister_device_handler(&rdac_dh);
}
module_init(rdac_init);
module_exit(rdac_exit);
MODULE_DESCRIPTION("Multipath LSI/Engenio/NetApp E-Series RDAC driver");
MODULE_AUTHOR("Mike Christie, Chandra Seetharaman");
MODULE_VERSION("01.00.0000.0000");
MODULE_LICENSE("GPL");