hisi_sas: add v2 code to send smp command

Signed-off-by: John Garry <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_v2_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
index ab6ea25a1e2729b3a5a144e988d2650caddc7806..2c6a753e093352b442e3eca5e480aaef236ad721 100644 (file)
--- a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
@@ -744,6 +744,76 @@ static int prep_prd_sge_v2_hw(struct hisi_hba *hisi_hba,
        return 0;
 }
 
+static int prep_smp_v2_hw(struct hisi_hba *hisi_hba,
+                         struct hisi_sas_slot *slot)
+{
+       struct sas_task *task = slot->task;
+       struct hisi_sas_cmd_hdr *hdr = slot->cmd_hdr;
+       struct domain_device *device = task->dev;
+       struct device *dev = &hisi_hba->pdev->dev;
+       struct hisi_sas_port *port = slot->port;
+       struct scatterlist *sg_req, *sg_resp;
+       struct hisi_sas_device *sas_dev = device->lldd_dev;
+       dma_addr_t req_dma_addr;
+       unsigned int req_len, resp_len;
+       int elem, rc;
+
+       /*
+       * DMA-map SMP request, response buffers
+       */
+       /* req */
+       sg_req = &task->smp_task.smp_req;
+       elem = dma_map_sg(dev, sg_req, 1, DMA_TO_DEVICE);
+       if (!elem)
+               return -ENOMEM;
+       req_len = sg_dma_len(sg_req);
+       req_dma_addr = sg_dma_address(sg_req);
+
+       /* resp */
+       sg_resp = &task->smp_task.smp_resp;
+       elem = dma_map_sg(dev, sg_resp, 1, DMA_FROM_DEVICE);
+       if (!elem) {
+               rc = -ENOMEM;
+               goto err_out_req;
+       }
+       resp_len = sg_dma_len(sg_resp);
+       if ((req_len & 0x3) || (resp_len & 0x3)) {
+               rc = -EINVAL;
+               goto err_out_resp;
+       }
+
+       /* create header */
+       /* dw0 */
+       hdr->dw0 = cpu_to_le32((port->id << CMD_HDR_PORT_OFF) |
+                              (1 << CMD_HDR_PRIORITY_OFF) | /* high pri */
+                              (2 << CMD_HDR_CMD_OFF)); /* smp */
+
+       /* map itct entry */
+       hdr->dw1 = cpu_to_le32((sas_dev->device_id << CMD_HDR_DEV_ID_OFF) |
+                              (1 << CMD_HDR_FRAME_TYPE_OFF) |
+                              (DIR_NO_DATA << CMD_HDR_DIR_OFF));
+
+       /* dw2 */
+       hdr->dw2 = cpu_to_le32((((req_len - 4) / 4) << CMD_HDR_CFL_OFF) |
+                              (HISI_SAS_MAX_SMP_RESP_SZ / 4 <<
+                              CMD_HDR_MRFL_OFF));
+
+       hdr->transfer_tags = cpu_to_le32(slot->idx << CMD_HDR_IPTT_OFF);
+
+       hdr->cmd_table_addr = cpu_to_le64(req_dma_addr);
+       hdr->sts_buffer_addr = cpu_to_le64(slot->status_buffer_dma);
+
+       return 0;
+
+err_out_resp:
+       dma_unmap_sg(dev, &slot->task->smp_task.smp_resp, 1,
+                    DMA_FROM_DEVICE);
+err_out_req:
+       dma_unmap_sg(dev, &slot->task->smp_task.smp_req, 1,
+                    DMA_TO_DEVICE);
+       return rc;
+}
+
 static int prep_ssp_v2_hw(struct hisi_hba *hisi_hba,
                          struct hisi_sas_slot *slot, int is_tmf,
                          struct hisi_sas_tmf_task *tmf)
@@ -1395,6 +1465,7 @@ static const struct hisi_sas_hw hisi_sas_v2_hw = {
        .hw_init = hisi_sas_v2_init,
        .sl_notify = sl_notify_v2_hw,
        .get_wideport_bitmap = get_wideport_bitmap_v2_hw,
+       .prep_smp = prep_smp_v2_hw,
        .prep_ssp = prep_ssp_v2_hw,
        .get_free_slot = get_free_slot_v2_hw,
        .start_delivery = start_delivery_v2_hw,