hisi_sas: add slot_index_alloc_quirk_v2_hw()

Add v2 hw custom function slot_index_alloc_quirk_v2_hw().  SAS devices
should have IPTT bit0 equal to 1.

Signed-off-by: John Garry <john.garry@huawei.com>
Reviewed-by: Hannes Reinicke <hare@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

1 files changed, 28 insertions, 0 deletions

diff --git a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
index 4276594a14c8..f2966d8cde07 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
@@ -465,6 +465,33 @@ static u32 hisi_sas_phy_read32(struct hisi_hba *hisi_hba,
         return readl(regs);
 }
 
+/* This function needs to be protected from pre-emption. */
+static int
+slot_index_alloc_quirk_v2_hw(struct hisi_hba *hisi_hba, int *slot_idx,
+                       struct domain_device *device)
+{
+        unsigned int index = 0;
+        void *bitmap = hisi_hba->slot_index_tags;
+        int sata_dev = dev_is_sata(device);
+
+        while (1) {
+                index = find_next_zero_bit(bitmap, hisi_hba->slot_index_count,
+                                           index);
+                if (index >= hisi_hba->slot_index_count)
+                        return -SAS_QUEUE_FULL;
+                /*
+                 * SAS IPTT bit0 should be 1
+                 */
+                if (sata_dev || (index & 1))
+                        break;
+                index++;
+        }
+
+        set_bit(index, bitmap);
+        *slot_idx = index;
+        return 0;
+}
+
 static void config_phy_opt_mode_v2_hw(struct hisi_hba *hisi_hba, int phy_no)
 {
         u32 cfg = hisi_sas_phy_read32(hisi_hba, phy_no, PHY_CFG);
@@ -2167,6 +2194,7 @@ static int hisi_sas_v2_init(struct hisi_hba *hisi_hba)
 static const struct hisi_sas_hw hisi_sas_v2_hw = {
         .hw_init = hisi_sas_v2_init,
         .setup_itct = setup_itct_v2_hw,
+        .slot_index_alloc = slot_index_alloc_quirk_v2_hw,
         .sl_notify = sl_notify_v2_hw,
         .get_wideport_bitmap = get_wideport_bitmap_v2_hw,
         .free_device = free_device_v2_hw,