[SCSI] stex: add shared tags from block

Use block shared tags entirely within the driver. In the case of
shutdown, assume that there are no other outstanding commands, so tag
0 is fine.

Signed-off-by: Ed Lin <ed.lin@promise.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 57 insertions, 120 deletions

diff --git a/drivers/scsi/stex.c b/drivers/scsi/stex.c
index fd093302bf1a..15fb99f224ee 100644
--- a/drivers/scsi/stex.c
+++ b/drivers/scsi/stex.c
@@ -34,6 +34,7 @@
 #include <scsi/scsi_device.h>
 #include <scsi/scsi_cmnd.h>
 #include <scsi/scsi_host.h>
+#include <scsi/scsi_tcq.h>
 
 #define DRV_NAME "stex"
 #define ST_DRIVER_VERSION "2.9.0.13"
@@ -95,7 +96,6 @@ enum {
 
         /* request count, etc. */
         MU_MAX_REQUEST                          = 32,
-        TAG_BITMAP_LENGTH                       = MU_MAX_REQUEST,
 
         /* one message wasted, use MU_MAX_REQUEST+1
                 to handle MU_MAX_REQUEST messages */
@@ -265,7 +265,6 @@ struct st_hba {
         struct Scsi_Host *host;
         struct pci_dev *pdev;
 
-        u32 tag;
         u32 req_head;
         u32 req_tail;
         u32 status_head;
@@ -309,40 +308,6 @@ static void stex_gettime(__le32 *time)
         *(time + 1) = cpu_to_le32((tv.tv_sec >> 16) >> 16);
 }
 
-static u16 __stex_alloc_tag(unsigned long *bitmap)
-{
-        int i;
-        i = find_first_zero_bit(bitmap, TAG_BITMAP_LENGTH);
-        if (i < TAG_BITMAP_LENGTH)
-                __set_bit(i, bitmap);
-        return (u16)i;
-}
-
-static u16 stex_alloc_tag(struct st_hba *hba, unsigned long *bitmap)
-{
-        unsigned long flags;
-        u16 tag;
-
-        spin_lock_irqsave(hba->host->host_lock, flags);
-        tag = __stex_alloc_tag(bitmap);
-        spin_unlock_irqrestore(hba->host->host_lock, flags);
-        return tag;
-}
-
-static void __stex_free_tag(unsigned long *bitmap, u16 tag)
-{
-        __clear_bit((int)tag, bitmap);
-}
-
-static void stex_free_tag(struct st_hba *hba, unsigned long *bitmap, u16 tag)
-{
-        unsigned long flags;
-
-        spin_lock_irqsave(hba->host->host_lock, flags);
-        __stex_free_tag(bitmap, tag);
-        spin_unlock_irqrestore(hba->host->host_lock, flags);
-}
-
 static struct status_msg *stex_get_status(struct st_hba *hba)
 {
         struct status_msg *status =
@@ -535,57 +500,31 @@ stex_send_cmd(struct st_hba *hba, struct req_msg *req, u16 tag)
 }
 
 static int
+stex_slave_alloc(struct scsi_device *sdev)
+{
+        /* Cheat: usually extracted from Inquiry data */
+        sdev->tagged_supported = 1;
+
+        scsi_activate_tcq(sdev, sdev->host->can_queue);
+
+        return 0;
+}
+
+static int
 stex_slave_config(struct scsi_device *sdev)
 {
         sdev->use_10_for_rw = 1;
         sdev->use_10_for_ms = 1;
         sdev->timeout = 60 * HZ;
+        sdev->tagged_supported = 1;
+
         return 0;
 }
 
 static void
 stex_slave_destroy(struct scsi_device *sdev)
 {
-        struct st_hba *hba = (struct st_hba *) sdev->host->hostdata;
-        struct req_msg *req;
-        unsigned long flags;
-        unsigned long before;
-        u16 tag;
-
-        if (sdev->type != TYPE_DISK)
-                return;
-
-        before = jiffies;
-        while ((tag = stex_alloc_tag(hba, (unsigned long *)&hba->tag))
-                == TAG_BITMAP_LENGTH) {
-                if (time_after(jiffies, before + ST_INTERNAL_TIMEOUT * HZ))
-                        return;
-                msleep(10);
-        }
-
-        spin_lock_irqsave(hba->host->host_lock, flags);
-        req = stex_alloc_req(hba);
-        memset(req->cdb, 0, STEX_CDB_LENGTH);
-
-        req->target = sdev->id;
-        req->lun = sdev->channel; /* firmware lun issue work around */
-        req->cdb[0] = SYNCHRONIZE_CACHE;
-
-        hba->ccb[tag].cmd = NULL;
-        hba->ccb[tag].sg_count = 0;
-        hba->ccb[tag].sense_bufflen = 0;
-        hba->ccb[tag].sense_buffer = NULL;
-        hba->ccb[tag].req_type |= PASSTHRU_REQ_TYPE;
-
-        stex_send_cmd(hba, req, tag);
-        spin_unlock_irqrestore(hba->host->host_lock, flags);
-
-        wait_event_timeout(hba->waitq,
-                !(hba->ccb[tag].req_type), ST_INTERNAL_TIMEOUT * HZ);
-        if (hba->ccb[tag].req_type & PASSTHRU_REQ_TYPE)
-                return;
-
-        stex_free_tag(hba, (unsigned long *)&hba->tag, tag);
+        scsi_deactivate_tcq(sdev, 1);
 }
 
 static int
@@ -650,8 +589,9 @@ stex_queuecommand(struct scsi_cmnd *cmd, void (* done)(struct scsi_cmnd *))
 
         cmd->scsi_done = done;
 
-        if (unlikely((tag = __stex_alloc_tag((unsigned long *)&hba->tag))
-                == TAG_BITMAP_LENGTH))
+        tag = cmd->request->tag;
+
+        if (unlikely(tag >= host->can_queue))
                 return SCSI_MLQUEUE_HOST_BUSY;
 
         req = stex_alloc_req(hba);
@@ -771,26 +711,18 @@ static void stex_mu_intr(struct st_hba *hba, u32 doorbell)
         while (hba->status_tail != hba->status_head) {
                 resp = stex_get_status(hba);
                 tag = le16_to_cpu(resp->tag);
-                if (unlikely(tag >= TAG_BITMAP_LENGTH)) {
+                if (unlikely(tag >= hba->host->can_queue)) {
                         printk(KERN_WARNING DRV_NAME
                                 "(%s): invalid tag\n", pci_name(hba->pdev));
                         continue;
                 }
-                if (unlikely((hba->tag & (1 << tag)) == 0)) {
-                        printk(KERN_WARNING DRV_NAME
-                                "(%s): null tag\n", pci_name(hba->pdev));
-                        continue;
-                }
 
-                hba->out_req_cnt--;
                 ccb = &hba->ccb[tag];
                 if (hba->wait_ccb == ccb)
                         hba->wait_ccb = NULL;
                 if (unlikely(ccb->req == NULL)) {
                         printk(KERN_WARNING DRV_NAME
                                 "(%s): lagging req\n", pci_name(hba->pdev));
-                        __stex_free_tag((unsigned long *)&hba->tag, tag);
-                        stex_unmap_sg(hba, ccb->cmd); /* ??? */
                         continue;
                 }
 
@@ -808,7 +740,15 @@ static void stex_mu_intr(struct st_hba *hba, u32 doorbell)
                 ccb->srb_status = resp->srb_status;
                 ccb->scsi_status = resp->scsi_status;
 
-                if (ccb->req_type & PASSTHRU_REQ_TYPE) {
+                if (likely(ccb->cmd != NULL)) {
+                        if (unlikely(ccb->cmd->cmnd[0] == PASSTHRU_CMD &&
+                                ccb->cmd->cmnd[1] == PASSTHRU_GET_ADAPTER))
+                                stex_controller_info(hba, ccb);
+                        stex_unmap_sg(hba, ccb->cmd);
+                        stex_scsi_done(ccb);
+                        hba->out_req_cnt--;
+                } else if (ccb->req_type & PASSTHRU_REQ_TYPE) {
+                        hba->out_req_cnt--;
                         if (ccb->req_type & PASSTHRU_REQ_NO_WAKEUP) {
                                 ccb->req_type = 0;
                                 continue;
@@ -816,14 +756,7 @@ static void stex_mu_intr(struct st_hba *hba, u32 doorbell)
                         ccb->req_type = 0;
                         if (waitqueue_active(&hba->waitq))
                                 wake_up(&hba->waitq);
-                        continue;
                 }
-                if (ccb->cmd->cmnd[0] == PASSTHRU_CMD &&
-                        ccb->cmd->cmnd[1] == PASSTHRU_GET_ADAPTER)
-                        stex_controller_info(hba, ccb);
-                __stex_free_tag((unsigned long *)&hba->tag, tag);
-                stex_unmap_sg(hba, ccb->cmd);
-                stex_scsi_done(ccb);
         }
 
 update_status:
@@ -933,21 +866,24 @@ static int stex_abort(struct scsi_cmnd *cmd)
 {
         struct Scsi_Host *host = cmd->device->host;
         struct st_hba *hba = (struct st_hba *)host->hostdata;
-        u16 tag;
+        u16 tag = cmd->request->tag;
         void __iomem *base;
         u32 data;
         int result = SUCCESS;
         unsigned long flags;
         base = hba->mmio_base;
         spin_lock_irqsave(host->host_lock, flags);
-
-        for (tag = 0; tag < MU_MAX_REQUEST; tag++)
-                if (hba->ccb[tag].cmd == cmd && (hba->tag & (1 << tag))) {
-                        hba->wait_ccb = &(hba->ccb[tag]);
-                        break;
-                }
-        if (tag >= MU_MAX_REQUEST)
-                goto out;
+        if (tag < host->can_queue && hba->ccb[tag].cmd == cmd)
+                hba->wait_ccb = &hba->ccb[tag];
+        else {
+                for (tag = 0; tag < host->can_queue; tag++)
+                        if (hba->ccb[tag].cmd == cmd) {
+                                hba->wait_ccb = &hba->ccb[tag];
+                                break;
+                        }
+                if (tag >= host->can_queue)
+                        goto out;
+        }
 
         data = readl(base + ODBL);
         if (data == 0 || data == 0xffffffff)
@@ -965,6 +901,7 @@ static int stex_abort(struct scsi_cmnd *cmd)
         }
 
 fail_out:
+        stex_unmap_sg(hba, cmd);
         hba->wait_ccb->req = NULL; /* nullify the req's future return */
         hba->wait_ccb = NULL;
         result = FAILED;
@@ -1025,7 +962,6 @@ static int stex_reset(struct scsi_cmnd *cmd)
                 return FAILED;
         }
         spin_lock_irqsave(hba->host->host_lock, flags);
-        hba->tag = 0;
         hba->req_head = 0;
         hba->req_tail = 0;
         hba->status_head = 0;
@@ -1061,6 +997,7 @@ static struct scsi_host_template driver_template = {
         .proc_name                      = DRV_NAME,
         .bios_param                     = stex_biosparam,
         .queuecommand                   = stex_queuecommand,
+        .slave_alloc                    = stex_slave_alloc,
         .slave_configure                = stex_slave_config,
         .slave_destroy                  = stex_slave_destroy,
         .eh_abort_handler               = stex_abort,
@@ -1171,6 +1108,14 @@ stex_probe(struct pci_dev *pdev, const struct pci_device_id *id)
         if (err)
                 goto out_free_irq;
 
+        scsi_init_shared_tag_map(host, ST_CAN_QUEUE);
+        if (host->bqt == NULL) {
+                err = -ENOMEM;
+                printk(KERN_ERR DRV_NAME "(%s): init shared queue failed\n",
+                        pci_name(pdev));
+                goto out_free_irq;
+        }
+
         pci_set_drvdata(pdev, hba);
 
         err = scsi_add_host(host, &pdev->dev);
@@ -1206,15 +1151,7 @@ static void stex_hba_stop(struct st_hba *hba)
         struct req_msg *req;
         unsigned long flags;
         unsigned long before;
-        u16 tag;
-
-        before = jiffies;
-        while ((tag = stex_alloc_tag(hba, (unsigned long *)&hba->tag))
-                == TAG_BITMAP_LENGTH) {
-                if (time_after(jiffies, before + ST_INTERNAL_TIMEOUT * HZ))
-                        return;
-                msleep(10);
-        }
+        u16 tag = 0;
 
         spin_lock_irqsave(hba->host->host_lock, flags);
         req = stex_alloc_req(hba);
@@ -1233,12 +1170,12 @@ static void stex_hba_stop(struct st_hba *hba)
         stex_send_cmd(hba, req, tag);
         spin_unlock_irqrestore(hba->host->host_lock, flags);
 
-        wait_event_timeout(hba->waitq,
-                !(hba->ccb[tag].req_type), ST_INTERNAL_TIMEOUT * HZ);
-        if (hba->ccb[tag].req_type & PASSTHRU_REQ_TYPE)
-                return;
-
-        stex_free_tag(hba, (unsigned long *)&hba->tag, tag);
+        before = jiffies;
+        while (hba->ccb[tag].req_type & PASSTHRU_REQ_TYPE) {
+                if (time_after(jiffies, before + ST_INTERNAL_TIMEOUT * HZ))
+                        return;
+                msleep(10);
+        }
 }
 
 static void stex_hba_free(struct st_hba *hba)