[SCSI] stex: fix id mapping issue

The correct internal mapping of stex controllers should be:
id:0~15, lun:0~7 (st_shasta)
id:0, lun:0~127 (st_yosemite)
id:0~127, lun:0 (st_vsc and st_vsc1)

This patch reports the internal mapping to scsi mid layer,  eliminating
the translation between scsi mid layer and firmware. To achieve this
goal, we also need to:
-- fail the REPORT_LUNS command for st_shasta because the
   firmware is known to not report all actual luns
-- add an entry in scsi_devindo.c to force sequential lun scan
   (for st_shasta controllers)
-- fail the REPORT_LUNS command for console device
-- remove special handling of REPORT_LUNS command for
   st_yosemite, as there is no translation mapping now

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

1 files changed, 28 insertions, 32 deletions

diff --git a/drivers/scsi/stex.c b/drivers/scsi/stex.c
index 69be1324b114..96dcbac9545e 100644
--- a/drivers/scsi/stex.c
+++ b/drivers/scsi/stex.c
@@ -113,10 +113,6 @@ enum {
         SG_CF_64B                               = 0x40, /* 64 bit item */
         SG_CF_HOST                              = 0x20, /* sg in host memory */
 
-        ST_MAX_ARRAY_SUPPORTED                  = 16,
-        ST_MAX_TARGET_NUM                       = (ST_MAX_ARRAY_SUPPORTED+1),
-        ST_MAX_LUN_PER_TARGET                   = 16,
-
         st_shasta                               = 0,
         st_vsc                                  = 1,
         st_vsc1                                 = 2,
@@ -586,7 +582,7 @@ stex_queuecommand(struct scsi_cmnd *cmd, void (* done)(struct scsi_cmnd *))
         u16 tag;
         host = cmd->device->host;
         id = cmd->device->id;
-        lun = cmd->device->channel; /* firmware lun issue work around */
+        lun = cmd->device->lun;
         hba = (struct st_hba *) &host->hostdata[0];
 
         switch (cmd->cmnd[0]) {
@@ -605,8 +601,19 @@ stex_queuecommand(struct scsi_cmnd *cmd, void (* done)(struct scsi_cmnd *))
                         stex_invalid_field(cmd, done);
                 return 0;
         }
+        case REPORT_LUNS:
+                /*
+                 * The shasta firmware does not report actual luns in the
+                 * target, so fail the command to force sequential lun scan.
+                 * Also, the console device does not support this command.
+                 */
+                if (hba->cardtype == st_shasta || id == host->max_id - 1) {
+                        stex_invalid_field(cmd, done);
+                        return 0;
+                }
+                break;
         case INQUIRY:
-                if (id != ST_MAX_ARRAY_SUPPORTED)
+                if (id != host->max_id - 1)
                         break;
                 if (lun == 0 && (cmd->cmnd[1] & INQUIRY_EVPD) == 0) {
                         stex_direct_copy(cmd, console_inq_page,
@@ -624,7 +631,7 @@ stex_queuecommand(struct scsi_cmnd *cmd, void (* done)(struct scsi_cmnd *))
                         ver.oem = ST_OEM;
                         ver.build = ST_BUILD_VER;
                         ver.signature[0] = PASSTHRU_SIGNATURE;
-                        ver.console_id = ST_MAX_ARRAY_SUPPORTED;
+                        ver.console_id = host->max_id - 1;
                         ver.host_no = hba->host->host_no;
                         cmd->result = stex_direct_copy(cmd, &ver, sizeof(ver)) ?
                                 DID_OK << 16 | COMMAND_COMPLETE << 8 :
@@ -645,13 +652,8 @@ stex_queuecommand(struct scsi_cmnd *cmd, void (* done)(struct scsi_cmnd *))
 
         req = stex_alloc_req(hba);
 
-        if (hba->cardtype == st_yosemite) {
-                req->lun = lun * (ST_MAX_TARGET_NUM - 1) + id;
-                req->target = 0;
-        } else {
-                req->lun = lun;
-                req->target = id;
-        }
+        req->lun = lun;
+        req->target = id;
 
         /* cdb */
         memcpy(req->cdb, cmd->cmnd, STEX_CDB_LENGTH);
@@ -767,18 +769,6 @@ static void stex_ys_commands(struct st_hba *hba,
                         ccb->srb_status = SRB_STATUS_SELECTION_TIMEOUT;
                 else
                         ccb->srb_status = SRB_STATUS_SUCCESS;
-        } else if (ccb->cmd->cmnd[0] == REPORT_LUNS) {
-                u8 *report_lun_data = (u8 *)hba->copy_buffer;
-
-                count = STEX_EXTRA_SIZE;
-                stex_internal_copy(ccb->cmd, report_lun_data,
-                        &count, ccb->sg_count, ST_FROM_CMD);
-                if (report_lun_data[2] || report_lun_data[3]) {
-                        report_lun_data[2] = 0x00;
-                        report_lun_data[3] = 0x08;
-                        stex_internal_copy(ccb->cmd, report_lun_data,
-                                &count, ccb->sg_count, ST_TO_CMD);
-                }
         }
 }
 
@@ -1229,12 +1219,18 @@ stex_probe(struct pci_dev *pdev, const struct pci_device_id *id)
         hba->copy_buffer = hba->dma_mem + MU_BUFFER_SIZE;
         hba->mu_status = MU_STATE_STARTING;
 
-        /* firmware uses id/lun pair for a logical drive, but lun would be
-           always 0 if CONFIG_SCSI_MULTI_LUN not configured, so we use
-           channel to map lun here */
-        host->max_channel = ST_MAX_LUN_PER_TARGET - 1;
-        host->max_id = ST_MAX_TARGET_NUM;
-        host->max_lun = 1;
+        if (hba->cardtype == st_shasta) {
+                host->max_lun = 8;
+                host->max_id = 16 + 1;
+        } else if (hba->cardtype == st_yosemite) {
+                host->max_lun = 128;
+                host->max_id = 1 + 1;
+        } else {
+                /* st_vsc and st_vsc1 */
+                host->max_lun = 1;
+                host->max_id = 128 + 1;
+        }
+        host->max_channel = 0;
         host->unique_id = host->host_no;
         host->max_cmd_len = STEX_CDB_LENGTH;