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hpsa: use block layer tag for command allocation

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Rework slave allocation:
  - separate the tagging support setup from the hostdata setup
  - make the hostdata setup act consistently when the lookup fails
  - make the hostdata setup act consistently when the device is not added
  - set up the queue depth consistently across these scenarios
  - if the block layer mq support is not available, explicitly enable and
    activate the SCSI layer tcq support (and do this at allocation-time so
    that the tags will be available for INQUIRY commands)

Tweak slave configuration so that devices which are masked are also
not attached.

Reviewed-by: Scott Teel <scott.teel@pmcs.com>
Reviewed-by: Kevin Barnett <kevin.barnett@pmcs.com>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Reviewed-by: Hannes Reinecke <hare@Suse.de>
Signed-off-by: Webb Scales <webbnh@hp.com>
Signed-off-by: Don Brace <don.brace@pmcs.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: James Bottomley <JBottomley@Odin.com>
This commit is contained in:
Webb Scales 2015-04-23 09:35:04 -05:00 committed by James Bottomley
parent 8b47004a55
commit 73153fe533
2 changed files with 129 additions and 33 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

161
drivers/scsi/hpsa.c
View file

@ -44,6 +44,7 @@
#include <scsi/scsi_host.h>
#include <scsi/scsi_tcq.h>
#include <scsi/scsi_eh.h>
#include <scsi/scsi_dbg.h>
#include <linux/cciss_ioctl.h>
#include <linux/string.h>
#include <linux/bitmap.h>
@ -212,6 +213,9 @@ static int hpsa_compat_ioctl(struct scsi_device *dev, int cmd,
static void cmd_free(struct ctlr_info *h, struct CommandList *c);
static struct CommandList *cmd_alloc(struct ctlr_info *h);
static void cmd_tagged_free(struct ctlr_info *h, struct CommandList *c);
static struct CommandList *cmd_tagged_alloc(struct ctlr_info *h,
struct scsi_cmnd *scmd);
static int fill_cmd(struct CommandList *c, u8 cmd, struct ctlr_info *h,
void *buff, size_t size, u16 page_code, unsigned char *scsi3addr,
int cmd_type);
@ -2010,11 +2014,17 @@ static void hpsa_cmd_resolve_events(struct ctlr_info *h,
}
}
static void hpsa_cmd_resolve_and_free(struct ctlr_info *h,
struct CommandList *c)
{
hpsa_cmd_resolve_events(h, c);
cmd_tagged_free(h, c);
}
static void hpsa_cmd_free_and_done(struct ctlr_info *h,
struct CommandList *c, struct scsi_cmnd *cmd)
{
hpsa_cmd_resolve_events(h, c);
cmd_free(h, c);
hpsa_cmd_resolve_and_free(h, c);
cmd->scsi_done(cmd);
}
@ -2035,8 +2045,7 @@ static void hpsa_cmd_abort_and_free(struct ctlr_info *h, struct CommandList *c,
hpsa_set_scsi_cmd_aborted(cmd);
dev_warn(&h->pdev->dev, "CDB %16phN was aborted with status 0x%x\n",
c->Request.CDB, c->err_info->ScsiStatus);
hpsa_cmd_resolve_events(h, c);
cmd_free(h, c); /* FIX-ME: change to cmd_tagged_free(h, c) */
hpsa_cmd_resolve_and_free(h, c);
}
static void process_ioaccel2_completion(struct ctlr_info *h,
@ -4500,7 +4509,7 @@ static int hpsa_ciss_submit(struct ctlr_info *h,
}
if (hpsa_scatter_gather(h, c, cmd) < 0) { /* Fill SG list */
cmd_free(h, c);
hpsa_cmd_resolve_and_free(h, c);
return SCSI_MLQUEUE_HOST_BUSY;
}
enqueue_cmd_and_start_io(h, c);
@ -4546,6 +4555,8 @@ static inline void hpsa_cmd_partial_init(struct ctlr_info *h, int index,
{
dma_addr_t cmd_dma_handle = h->cmd_pool_dhandle + index * sizeof(*c);
BUG_ON(c->cmdindex != index);
memset(c->Request.CDB, 0, sizeof(c->Request.CDB));
memset(c->err_info, 0, sizeof(*c->err_info));
c->busaddr = (u32) cmd_dma_handle;
@ -4640,12 +4651,16 @@ static int hpsa_scsi_queue_command(struct Scsi_Host *sh, struct scsi_cmnd *cmd)
/* Get the ptr to our adapter structure out of cmd->host. */
h = sdev_to_hba(cmd->device);
BUG_ON(cmd->request->tag < 0);
dev = cmd->device->hostdata;
if (!dev) {
cmd->result = DID_NO_CONNECT << 16;
cmd->scsi_done(cmd);
return 0;
}
memcpy(scsi3addr, dev->scsi3addr, sizeof(scsi3addr));
if (unlikely(lockup_detected(h))) {
@ -4653,14 +4668,7 @@ static int hpsa_scsi_queue_command(struct Scsi_Host *sh, struct scsi_cmnd *cmd)
cmd->scsi_done(cmd);
return 0;
}
c = cmd_alloc(h);
if (unlikely(lockup_detected(h))) {
cmd->result = DID_NO_CONNECT << 16;
cmd_free(h, c);
cmd->scsi_done(cmd);
return 0;
}
c = cmd_tagged_alloc(h, cmd);
/*
* Call alternate submit routine for I/O accelerated commands.
@ -4673,7 +4681,7 @@ static int hpsa_scsi_queue_command(struct Scsi_Host *sh, struct scsi_cmnd *cmd)
if (rc == 0)
return 0;
if (rc == SCSI_MLQUEUE_HOST_BUSY) {
cmd_free(h, c);
hpsa_cmd_resolve_and_free(h, c);
return SCSI_MLQUEUE_HOST_BUSY;
}
}
@ -4787,15 +4795,23 @@ static int hpsa_register_scsi(struct ctlr_info *h)
sh->hostdata[0] = (unsigned long) h;
sh->irq = h->intr[h->intr_mode];
sh->unique_id = sh->irq;
error = scsi_add_host(sh, &h->pdev->dev);
if (error)
error = scsi_init_shared_tag_map(sh, sh->can_queue);
if (error) {
dev_err(&h->pdev->dev,
"%s: scsi_init_shared_tag_map failed for controller %d\n",
__func__, h->ctlr);
goto fail_host_put;
}
error = scsi_add_host(sh, &h->pdev->dev);
if (error) {
dev_err(&h->pdev->dev, "%s: scsi_add_host failed for controller %d\n",
__func__, h->ctlr);
goto fail_host_put;
}
scsi_scan_host(sh);
return 0;
fail_host_put:
dev_err(&h->pdev->dev, "%s: scsi_add_host"
" failed for controller %d\n", __func__, h->ctlr);
scsi_host_put(sh);
return error;
fail:
@ -4804,6 +4820,23 @@ static int hpsa_register_scsi(struct ctlr_info *h)
return -ENOMEM;
}
/*
* The block layer has already gone to the trouble of picking out a unique,
* small-integer tag for this request. We use an offset from that value as
* an index to select our command block. (The offset allows us to reserve the
* low-numbered entries for our own uses.)
*/
static int hpsa_get_cmd_index(struct scsi_cmnd *scmd)
{
int idx = scmd->request->tag;
if (idx < 0)
return idx;
/* Offset to leave space for internal cmds. */
return idx += HPSA_NRESERVED_CMDS;
}
/*
* Send a TEST_UNIT_READY command to the specified LUN using the specified
* reply queue; returns zero if the unit is ready, and non-zero otherwise.
@ -4925,6 +4958,7 @@ static int hpsa_eh_device_reset_handler(struct scsi_cmnd *scsicmd)
int rc;
struct ctlr_info *h;
struct hpsa_scsi_dev_t *dev;
char msg[40];
/* find the controller to which the command to be aborted was sent */
h = sdev_to_hba(scsicmd->device);
@ -4943,19 +4977,17 @@ static int hpsa_eh_device_reset_handler(struct scsi_cmnd *scsicmd)
/* if controller locked up, we can guarantee command won't complete */
if (lockup_detected(h)) {
dev_warn(&h->pdev->dev,
"scsi %d:%d:%d:%d RESET FAILED, lockup detected\n",
h->scsi_host->host_no, dev->bus, dev->target,
dev->lun);
sprintf(msg, "cmd %d RESET FAILED, lockup detected",
hpsa_get_cmd_index(scsicmd));
hpsa_show_dev_msg(KERN_WARNING, h, dev, msg);
return FAILED;
}
/* this reset request might be the result of a lockup; check */
if (detect_controller_lockup(h)) {
dev_warn(&h->pdev->dev,
"scsi %d:%d:%d:%d RESET FAILED, new lockup detected\n",
h->scsi_host->host_no, dev->bus, dev->target,
dev->lun);
sprintf(msg, "cmd %d RESET FAILED, new lockup detected",
hpsa_get_cmd_index(scsicmd));
hpsa_show_dev_msg(KERN_WARNING, h, dev, msg);
return FAILED;
}
@ -5398,6 +5430,58 @@ static int hpsa_eh_abort_handler(struct scsi_cmnd *sc)
return !lockup_detected(h) ? SUCCESS : FAILED;
}
/*
* For operations with an associated SCSI command, a command block is allocated
* at init, and managed by cmd_tagged_alloc() and cmd_tagged_free() using the
* block request tag as an index into a table of entries. cmd_tagged_free() is
* the complement, although cmd_free() may be called instead.
*/
static struct CommandList *cmd_tagged_alloc(struct ctlr_info *h,
struct scsi_cmnd *scmd)
{
int idx = hpsa_get_cmd_index(scmd);
struct CommandList *c = h->cmd_pool + idx;
if (idx < HPSA_NRESERVED_CMDS || idx >= h->nr_cmds) {
dev_err(&h->pdev->dev, "Bad block tag: %d not in [%d..%d]\n",
idx, HPSA_NRESERVED_CMDS, h->nr_cmds - 1);
/* The index value comes from the block layer, so if it's out of
* bounds, it's probably not our bug.
*/
BUG();
}
atomic_inc(&c->refcount);
if (unlikely(!hpsa_is_cmd_idle(c))) {
/*
* We expect that the SCSI layer will hand us a unique tag
* value. Thus, there should never be a collision here between
* two requests...because if the selected command isn't idle
* then someone is going to be very disappointed.
*/
dev_err(&h->pdev->dev,
"tag collision (tag=%d) in cmd_tagged_alloc().\n",
idx);
if (c->scsi_cmd != NULL)
scsi_print_command(c->scsi_cmd);
scsi_print_command(scmd);
}
hpsa_cmd_partial_init(h, idx, c);
return c;
}
static void cmd_tagged_free(struct ctlr_info *h, struct CommandList *c)
{
/*
* Release our reference to the block. We don't need to do anything
* else to free it, because it is accessed by index. (There's no point
* in checking the result of the decrement, since we cannot guarantee
* that there isn't a concurrent abort which is also accessing it.)
*/
(void)atomic_dec(&c->refcount);
}
/*
* For operations that cannot sleep, a command block is allocated at init,
* and managed by cmd_alloc() and cmd_free() using a simple bitmap to track
@ -5411,7 +5495,7 @@ static struct CommandList *cmd_alloc(struct ctlr_info *h)
{
struct CommandList *c;
int refcount, i;
unsigned long offset;
int offset = 0;
/*
* There is some *extremely* small but non-zero chance that that
@ -5423,12 +5507,20 @@ static struct CommandList *cmd_alloc(struct ctlr_info *h)
* very unlucky thread might be starved anyway, never able to
* beat the other threads. In reality, this happens so
* infrequently as to be indistinguishable from never.
*
* Note that we start allocating commands before the SCSI host structure
* is initialized. Since the search starts at bit zero, this
* all works, since we have at least one command structure available;
* however, it means that the structures with the low indexes have to be
* reserved for driver-initiated requests, while requests from the block
* layer will use the higher indexes.
*/
offset = h->last_allocation; /* benignly racy */
for (;;) {
i = find_next_zero_bit(h->cmd_pool_bits, h->nr_cmds, offset);
if (unlikely(i == h->nr_cmds)) {
i = find_next_zero_bit(h->cmd_pool_bits,
HPSA_NRESERVED_CMDS,
offset);
if (unlikely(i >= HPSA_NRESERVED_CMDS)) {
offset = 0;
continue;
}
@ -5436,18 +5528,23 @@ static struct CommandList *cmd_alloc(struct ctlr_info *h)
refcount = atomic_inc_return(&c->refcount);
if (unlikely(refcount > 1)) {
cmd_free(h, c); /* already in use */
offset = (i + 1) % h->nr_cmds;
offset = (i + 1) % HPSA_NRESERVED_CMDS;
continue;
}
set_bit(i & (BITS_PER_LONG - 1),
h->cmd_pool_bits + (i / BITS_PER_LONG));
break; /* it's ours now. */
}
h->last_allocation = i; /* benignly racy */
hpsa_cmd_partial_init(h, i, c);
return c;
}
/*
* This is the complementary operation to cmd_alloc(). Note, however, in some
* corner cases it may also be used to free blocks allocated by
* cmd_tagged_alloc() in which case the ref-count decrement does the trick and
* the clear-bit is harmless.
*/
static void cmd_free(struct ctlr_info *h, struct CommandList *c)
{
if (atomic_dec_and_test(&c->refcount)) {

1
drivers/scsi/hpsa.h
View file

@ -141,7 +141,6 @@ struct ctlr_info {
struct CfgTable __iomem *cfgtable;
int interrupts_enabled;
int max_commands;
int last_allocation;
atomic_t commands_outstanding;
# define PERF_MODE_INT 0
# define DOORBELL_INT 1