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hpsa: use block layer tag for command allocation
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>
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@ -44,6 +44,7 @@
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#include <scsi/scsi_host.h>
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#include <scsi/scsi_tcq.h>
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#include <scsi/scsi_eh.h>
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#include <scsi/scsi_dbg.h>
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#include <linux/cciss_ioctl.h>
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#include <linux/string.h>
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#include <linux/bitmap.h>
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@ -212,6 +213,9 @@ static int hpsa_compat_ioctl(struct scsi_device *dev, int cmd,
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static void cmd_free(struct ctlr_info *h, struct CommandList *c);
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static struct CommandList *cmd_alloc(struct ctlr_info *h);
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static void cmd_tagged_free(struct ctlr_info *h, struct CommandList *c);
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static struct CommandList *cmd_tagged_alloc(struct ctlr_info *h,
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struct scsi_cmnd *scmd);
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static int fill_cmd(struct CommandList *c, u8 cmd, struct ctlr_info *h,
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void *buff, size_t size, u16 page_code, unsigned char *scsi3addr,
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int cmd_type);
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@ -2010,11 +2014,17 @@ static void hpsa_cmd_resolve_events(struct ctlr_info *h,
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}
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}
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static void hpsa_cmd_resolve_and_free(struct ctlr_info *h,
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struct CommandList *c)
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{
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hpsa_cmd_resolve_events(h, c);
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cmd_tagged_free(h, c);
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}
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static void hpsa_cmd_free_and_done(struct ctlr_info *h,
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struct CommandList *c, struct scsi_cmnd *cmd)
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{
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hpsa_cmd_resolve_events(h, c);
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cmd_free(h, c);
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hpsa_cmd_resolve_and_free(h, c);
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cmd->scsi_done(cmd);
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}
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@ -2035,8 +2045,7 @@ static void hpsa_cmd_abort_and_free(struct ctlr_info *h, struct CommandList *c,
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hpsa_set_scsi_cmd_aborted(cmd);
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dev_warn(&h->pdev->dev, "CDB %16phN was aborted with status 0x%x\n",
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c->Request.CDB, c->err_info->ScsiStatus);
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hpsa_cmd_resolve_events(h, c);
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cmd_free(h, c); /* FIX-ME: change to cmd_tagged_free(h, c) */
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hpsa_cmd_resolve_and_free(h, c);
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}
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static void process_ioaccel2_completion(struct ctlr_info *h,
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@ -4500,7 +4509,7 @@ static int hpsa_ciss_submit(struct ctlr_info *h,
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}
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if (hpsa_scatter_gather(h, c, cmd) < 0) { /* Fill SG list */
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cmd_free(h, c);
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hpsa_cmd_resolve_and_free(h, c);
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return SCSI_MLQUEUE_HOST_BUSY;
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}
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enqueue_cmd_and_start_io(h, c);
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@ -4546,6 +4555,8 @@ static inline void hpsa_cmd_partial_init(struct ctlr_info *h, int index,
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{
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dma_addr_t cmd_dma_handle = h->cmd_pool_dhandle + index * sizeof(*c);
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BUG_ON(c->cmdindex != index);
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memset(c->Request.CDB, 0, sizeof(c->Request.CDB));
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memset(c->err_info, 0, sizeof(*c->err_info));
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c->busaddr = (u32) cmd_dma_handle;
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@ -4640,12 +4651,16 @@ static int hpsa_scsi_queue_command(struct Scsi_Host *sh, struct scsi_cmnd *cmd)
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/* Get the ptr to our adapter structure out of cmd->host. */
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h = sdev_to_hba(cmd->device);
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BUG_ON(cmd->request->tag < 0);
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dev = cmd->device->hostdata;
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if (!dev) {
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cmd->result = DID_NO_CONNECT << 16;
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cmd->scsi_done(cmd);
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return 0;
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}
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memcpy(scsi3addr, dev->scsi3addr, sizeof(scsi3addr));
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if (unlikely(lockup_detected(h))) {
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@ -4653,14 +4668,7 @@ static int hpsa_scsi_queue_command(struct Scsi_Host *sh, struct scsi_cmnd *cmd)
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cmd->scsi_done(cmd);
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return 0;
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}
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c = cmd_alloc(h);
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if (unlikely(lockup_detected(h))) {
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cmd->result = DID_NO_CONNECT << 16;
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cmd_free(h, c);
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cmd->scsi_done(cmd);
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return 0;
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}
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c = cmd_tagged_alloc(h, cmd);
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/*
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* Call alternate submit routine for I/O accelerated commands.
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@ -4673,7 +4681,7 @@ static int hpsa_scsi_queue_command(struct Scsi_Host *sh, struct scsi_cmnd *cmd)
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if (rc == 0)
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return 0;
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if (rc == SCSI_MLQUEUE_HOST_BUSY) {
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cmd_free(h, c);
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hpsa_cmd_resolve_and_free(h, c);
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return SCSI_MLQUEUE_HOST_BUSY;
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}
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}
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@ -4787,15 +4795,23 @@ static int hpsa_register_scsi(struct ctlr_info *h)
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sh->hostdata[0] = (unsigned long) h;
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sh->irq = h->intr[h->intr_mode];
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sh->unique_id = sh->irq;
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error = scsi_add_host(sh, &h->pdev->dev);
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if (error)
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error = scsi_init_shared_tag_map(sh, sh->can_queue);
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if (error) {
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dev_err(&h->pdev->dev,
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"%s: scsi_init_shared_tag_map failed for controller %d\n",
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__func__, h->ctlr);
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goto fail_host_put;
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}
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error = scsi_add_host(sh, &h->pdev->dev);
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if (error) {
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dev_err(&h->pdev->dev, "%s: scsi_add_host failed for controller %d\n",
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__func__, h->ctlr);
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goto fail_host_put;
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}
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scsi_scan_host(sh);
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return 0;
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fail_host_put:
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dev_err(&h->pdev->dev, "%s: scsi_add_host"
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" failed for controller %d\n", __func__, h->ctlr);
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scsi_host_put(sh);
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return error;
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fail:
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@ -4804,6 +4820,23 @@ static int hpsa_register_scsi(struct ctlr_info *h)
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return -ENOMEM;
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}
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/*
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* The block layer has already gone to the trouble of picking out a unique,
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* small-integer tag for this request. We use an offset from that value as
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* an index to select our command block. (The offset allows us to reserve the
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* low-numbered entries for our own uses.)
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*/
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static int hpsa_get_cmd_index(struct scsi_cmnd *scmd)
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{
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int idx = scmd->request->tag;
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if (idx < 0)
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return idx;
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/* Offset to leave space for internal cmds. */
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return idx += HPSA_NRESERVED_CMDS;
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}
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/*
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* Send a TEST_UNIT_READY command to the specified LUN using the specified
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* reply queue; returns zero if the unit is ready, and non-zero otherwise.
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@ -4925,6 +4958,7 @@ static int hpsa_eh_device_reset_handler(struct scsi_cmnd *scsicmd)
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int rc;
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struct ctlr_info *h;
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struct hpsa_scsi_dev_t *dev;
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char msg[40];
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/* find the controller to which the command to be aborted was sent */
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h = sdev_to_hba(scsicmd->device);
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@ -4943,19 +4977,17 @@ static int hpsa_eh_device_reset_handler(struct scsi_cmnd *scsicmd)
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/* if controller locked up, we can guarantee command won't complete */
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if (lockup_detected(h)) {
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dev_warn(&h->pdev->dev,
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"scsi %d:%d:%d:%d RESET FAILED, lockup detected\n",
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h->scsi_host->host_no, dev->bus, dev->target,
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dev->lun);
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sprintf(msg, "cmd %d RESET FAILED, lockup detected",
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hpsa_get_cmd_index(scsicmd));
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hpsa_show_dev_msg(KERN_WARNING, h, dev, msg);
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return FAILED;
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}
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/* this reset request might be the result of a lockup; check */
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if (detect_controller_lockup(h)) {
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dev_warn(&h->pdev->dev,
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"scsi %d:%d:%d:%d RESET FAILED, new lockup detected\n",
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h->scsi_host->host_no, dev->bus, dev->target,
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dev->lun);
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sprintf(msg, "cmd %d RESET FAILED, new lockup detected",
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hpsa_get_cmd_index(scsicmd));
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hpsa_show_dev_msg(KERN_WARNING, h, dev, msg);
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return FAILED;
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}
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@ -5398,6 +5430,58 @@ static int hpsa_eh_abort_handler(struct scsi_cmnd *sc)
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return !lockup_detected(h) ? SUCCESS : FAILED;
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}
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/*
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* For operations with an associated SCSI command, a command block is allocated
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* at init, and managed by cmd_tagged_alloc() and cmd_tagged_free() using the
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* block request tag as an index into a table of entries. cmd_tagged_free() is
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* the complement, although cmd_free() may be called instead.
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*/
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static struct CommandList *cmd_tagged_alloc(struct ctlr_info *h,
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struct scsi_cmnd *scmd)
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{
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int idx = hpsa_get_cmd_index(scmd);
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struct CommandList *c = h->cmd_pool + idx;
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if (idx < HPSA_NRESERVED_CMDS || idx >= h->nr_cmds) {
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dev_err(&h->pdev->dev, "Bad block tag: %d not in [%d..%d]\n",
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idx, HPSA_NRESERVED_CMDS, h->nr_cmds - 1);
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/* The index value comes from the block layer, so if it's out of
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* bounds, it's probably not our bug.
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*/
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BUG();
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}
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atomic_inc(&c->refcount);
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if (unlikely(!hpsa_is_cmd_idle(c))) {
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/*
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* We expect that the SCSI layer will hand us a unique tag
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* value. Thus, there should never be a collision here between
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* two requests...because if the selected command isn't idle
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* then someone is going to be very disappointed.
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*/
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dev_err(&h->pdev->dev,
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"tag collision (tag=%d) in cmd_tagged_alloc().\n",
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idx);
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if (c->scsi_cmd != NULL)
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scsi_print_command(c->scsi_cmd);
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scsi_print_command(scmd);
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}
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hpsa_cmd_partial_init(h, idx, c);
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return c;
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}
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static void cmd_tagged_free(struct ctlr_info *h, struct CommandList *c)
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{
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/*
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* Release our reference to the block. We don't need to do anything
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* else to free it, because it is accessed by index. (There's no point
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* in checking the result of the decrement, since we cannot guarantee
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* that there isn't a concurrent abort which is also accessing it.)
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*/
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(void)atomic_dec(&c->refcount);
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}
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/*
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* For operations that cannot sleep, a command block is allocated at init,
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* and managed by cmd_alloc() and cmd_free() using a simple bitmap to track
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@ -5411,7 +5495,7 @@ static struct CommandList *cmd_alloc(struct ctlr_info *h)
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{
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struct CommandList *c;
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int refcount, i;
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unsigned long offset;
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int offset = 0;
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/*
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* There is some *extremely* small but non-zero chance that that
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@ -5423,12 +5507,20 @@ static struct CommandList *cmd_alloc(struct ctlr_info *h)
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* very unlucky thread might be starved anyway, never able to
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* beat the other threads. In reality, this happens so
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* infrequently as to be indistinguishable from never.
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*
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* Note that we start allocating commands before the SCSI host structure
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* is initialized. Since the search starts at bit zero, this
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* all works, since we have at least one command structure available;
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* however, it means that the structures with the low indexes have to be
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* reserved for driver-initiated requests, while requests from the block
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* layer will use the higher indexes.
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*/
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offset = h->last_allocation; /* benignly racy */
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for (;;) {
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i = find_next_zero_bit(h->cmd_pool_bits, h->nr_cmds, offset);
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if (unlikely(i == h->nr_cmds)) {
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i = find_next_zero_bit(h->cmd_pool_bits,
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HPSA_NRESERVED_CMDS,
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offset);
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if (unlikely(i >= HPSA_NRESERVED_CMDS)) {
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offset = 0;
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continue;
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}
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@ -5436,18 +5528,23 @@ static struct CommandList *cmd_alloc(struct ctlr_info *h)
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refcount = atomic_inc_return(&c->refcount);
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if (unlikely(refcount > 1)) {
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cmd_free(h, c); /* already in use */
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offset = (i + 1) % h->nr_cmds;
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offset = (i + 1) % HPSA_NRESERVED_CMDS;
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continue;
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}
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set_bit(i & (BITS_PER_LONG - 1),
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h->cmd_pool_bits + (i / BITS_PER_LONG));
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break; /* it's ours now. */
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}
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h->last_allocation = i; /* benignly racy */
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hpsa_cmd_partial_init(h, i, c);
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return c;
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}
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/*
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* This is the complementary operation to cmd_alloc(). Note, however, in some
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* corner cases it may also be used to free blocks allocated by
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* cmd_tagged_alloc() in which case the ref-count decrement does the trick and
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* the clear-bit is harmless.
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*/
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static void cmd_free(struct ctlr_info *h, struct CommandList *c)
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{
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if (atomic_dec_and_test(&c->refcount)) {
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@ -141,7 +141,6 @@ struct ctlr_info {
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struct CfgTable __iomem *cfgtable;
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int interrupts_enabled;
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int max_commands;
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int last_allocation;
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atomic_t commands_outstanding;
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# define PERF_MODE_INT 0
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# define DOORBELL_INT 1
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