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hpsa: correct handling of HBA device removal 

Need to report HBA device removal faster than the
event handler polling interval.

Stop I/O to the removed disk and wait for all
I/O operations to flush before removing the device.

Reviewed-by: Scott Teel <scott.teel@microsemi.com>
Reviewed-by: Kevin Barnett <kevin.barnett@microsemi.com>
Signed-off-by: Don Brace <don.brace@microsemi.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Don Brace 2016-04-27 17:14:17 -05:00 committed by Martin K. Petersen
parent 064d1b1d2d
commit ba74fdc411
2 changed files with 85 additions and 5 deletions
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89
drivers/scsi/hpsa.c
View File

@ -294,6 +294,9 @@ static void hpsa_disable_rld_caching(struct ctlr_info *h);
static inline int hpsa_scsi_do_report_phys_luns(struct ctlr_info *h,
struct ReportExtendedLUNdata *buf, int bufsize);
static int hpsa_luns_changed(struct ctlr_info *h);
static bool hpsa_cmd_dev_match(struct ctlr_info *h, struct CommandList *c,
struct hpsa_scsi_dev_t *dev,
unsigned char *scsi3addr);
static inline struct ctlr_info *sdev_to_hba(struct scsi_device *sdev)
{
@ -1745,6 +1748,51 @@ static int hpsa_add_device(struct ctlr_info *h, struct hpsa_scsi_dev_t *device)
return rc;
}
static int hpsa_find_outstanding_commands_for_dev(struct ctlr_info *h,
struct hpsa_scsi_dev_t *dev)
{
int i;
int count = 0;
for (i = 0; i < h->nr_cmds; i++) {
struct CommandList *c = h->cmd_pool + i;
int refcount = atomic_inc_return(&c->refcount);
if (refcount > 1 && hpsa_cmd_dev_match(h, c, dev,
dev->scsi3addr)) {
unsigned long flags;
spin_lock_irqsave(&h->lock, flags); /* Implied MB */
if (!hpsa_is_cmd_idle(c))
++count;
spin_unlock_irqrestore(&h->lock, flags);
}
cmd_free(h, c);
}
return count;
}
static void hpsa_wait_for_outstanding_commands_for_dev(struct ctlr_info *h,
struct hpsa_scsi_dev_t *device)
{
int cmds = 0;
int waits = 0;
while (1) {
cmds = hpsa_find_outstanding_commands_for_dev(h, device);
if (cmds == 0)
break;
if (++waits > 20)
break;
dev_warn(&h->pdev->dev,
"%s: removing device with %d outstanding commands!\n",
__func__, cmds);
msleep(1000);
}
}
static void hpsa_remove_device(struct ctlr_info *h,
struct hpsa_scsi_dev_t *device)
{
@ -1768,8 +1816,13 @@ static void hpsa_remove_device(struct ctlr_info *h,
hpsa_show_dev_msg(KERN_WARNING, h, device,
"didn't find device for removal.");
}
} else /* HBA */
} else { /* HBA */
device->removed = 1;
hpsa_wait_for_outstanding_commands_for_dev(h, device);
hpsa_remove_sas_device(device);
}
}
static void adjust_hpsa_scsi_table(struct ctlr_info *h,
@ -2171,7 +2224,8 @@ static void hpsa_unmap_sg_chain_block(struct ctlr_info *h,
static int handle_ioaccel_mode2_error(struct ctlr_info *h,
struct CommandList *c,
struct scsi_cmnd *cmd,
struct io_accel2_cmd *c2)
struct io_accel2_cmd *c2,
struct hpsa_scsi_dev_t *dev)
{
int data_len;
int retry = 0;
@ -2235,8 +2289,27 @@ static int handle_ioaccel_mode2_error(struct ctlr_info *h,
case IOACCEL2_STATUS_SR_NO_PATH_TO_DEVICE:
case IOACCEL2_STATUS_SR_INVALID_DEVICE:
case IOACCEL2_STATUS_SR_IOACCEL_DISABLED:
/* We will get an event from ctlr to trigger rescan */
retry = 1;
/*
* Did an HBA disk disappear? We will eventually
* get a state change event from the controller but
* in the meantime, we need to tell the OS that the
* HBA disk is no longer there and stop I/O
* from going down. This allows the potential re-insert
* of the disk to get the same device node.
*/
if (dev->physical_device && dev->expose_device) {
cmd->result = DID_NO_CONNECT << 16;
dev->removed = 1;
h->drv_req_rescan = 1;
dev_warn(&h->pdev->dev,
"%s: device is gone!\n", __func__);
} else
/*
* Retry by sending down the RAID path.
* We will get an event from ctlr to
* trigger rescan regardless.
*/
retry = 1;
break;
default:
retry = 1;
@ -2368,7 +2441,7 @@ static void process_ioaccel2_completion(struct ctlr_info *h,
return hpsa_retry_cmd(h, c);
}
if (handle_ioaccel_mode2_error(h, c, cmd, c2))
if (handle_ioaccel_mode2_error(h, c, cmd, c2, dev))
return hpsa_retry_cmd(h, c);
return hpsa_cmd_free_and_done(h, c, cmd);
@ -5263,6 +5336,12 @@ static int hpsa_scsi_queue_command(struct Scsi_Host *sh, struct scsi_cmnd *cmd)
dev = cmd->device->hostdata;
if (!dev) {
cmd->result = NOT_READY << 16; /* host byte */
cmd->scsi_done(cmd);
return 0;
}
if (dev->removed) {
cmd->result = DID_NO_CONNECT << 16;
cmd->scsi_done(cmd);
return 0;

1
drivers/scsi/hpsa.h
View File

@ -63,6 +63,7 @@ struct hpsa_scsi_dev_t {
unsigned char scsi3addr[8]; /* as presented to the HW */
u8 physical_device : 1;
u8 expose_device;
u8 removed : 1; /* device is marked for death */
#define RAID_CTLR_LUNID "\0\0\0\0\0\0\0\0"
unsigned char device_id[16]; /* from inquiry pg. 0x83 */
u64 sas_address;