scsi: hisi_sas: Put reserved tags in lower region of tagset

To be consistent with blk-mq, put the reserved tags in the lower region of
the tagset. Eventually we hope to get rid of all this reserved tag
management.

Signed-off-by: John Garry <john.garry@huawei.com>
Link: https://lore.kernel.org/r/1666091763-11023-4-git-send-email-john.garry@huawei.com
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c b/drivers/scsi/hisi_sas/hisi_sas_main.c
index 26e474b0f53f2e28fd65c888e9c3250d1fb77168..54860d2524667d9f7c854e8ac2ea8440c0960d4e 100644 (file)
--- a/drivers/scsi/hisi_sas/hisi_sas_main.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_main.c
@@ -183,16 +183,16 @@ static int hisi_sas_slot_index_alloc(struct hisi_hba *hisi_hba,
        void *bitmap = hisi_hba->slot_index_tags;
 
        if (rq)
-               return rq->tag;
+               return rq->tag + HISI_SAS_RESERVED_IPTT;
 
        spin_lock(&hisi_hba->lock);
-       index = find_next_zero_bit(bitmap, hisi_hba->slot_index_count,
+       index = find_next_zero_bit(bitmap, HISI_SAS_RESERVED_IPTT,
                                   hisi_hba->last_slot_index + 1);
-       if (index >= hisi_hba->slot_index_count) {
+       if (index >= HISI_SAS_RESERVED_IPTT) {
                index = find_next_zero_bit(bitmap,
-                               hisi_hba->slot_index_count,
-                               HISI_SAS_UNRESERVED_IPTT);
-               if (index >= hisi_hba->slot_index_count) {
+                               HISI_SAS_RESERVED_IPTT,
+                               0);
+               if (index >= HISI_SAS_RESERVED_IPTT) {
                        spin_unlock(&hisi_hba->lock);
                        return -SAS_QUEUE_FULL;
                }
@@ -2216,7 +2216,7 @@ int hisi_sas_alloc(struct hisi_hba *hisi_hba)
        if (!hisi_hba->sata_breakpoint)
                goto err_out;
 
-       hisi_hba->last_slot_index = HISI_SAS_UNRESERVED_IPTT;
+       hisi_hba->last_slot_index = 0;
 
        hisi_hba->wq = create_singlethread_workqueue(dev_name(dev));
        if (!hisi_hba->wq) {