hisi_sas: Add smp protocol support

Add support for smp function, which allows devices attached by expander
to be controlled.

Signed-off-by: John Garry <john.garry@huawei.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
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.h b/drivers/scsi/hisi_sas/hisi_sas.h
index e5ee3c9..f34f73b 100644 (file)
--- a/drivers/scsi/hisi_sas/hisi_sas.h
+++ b/drivers/scsi/hisi_sas/hisi_sas.h
@@ -36,6 +36,7 @@
                (((sizeof(union hisi_sas_command_table)+3)/4)*4)
 
 #define HISI_SAS_MAX_SSP_RESP_SZ (sizeof(struct ssp_frame_hdr) + 1024)
+#define HISI_SAS_MAX_SMP_RESP_SZ 1028
 
 #define HISI_SAS_NAME_LEN 32
 
@@ -132,6 +133,8 @@ struct hisi_sas_hw {
        int (*prep_ssp)(struct hisi_hba *hisi_hba,
                        struct hisi_sas_slot *slot, int is_tmf,
                        struct hisi_sas_tmf_task *tmf);
+       int (*prep_smp)(struct hisi_hba *hisi_hba,
+                       struct hisi_sas_slot *slot);
        int (*slot_complete)(struct hisi_hba *hisi_hba,
                             struct hisi_sas_slot *slot, int abort);
        void (*free_device)(struct hisi_hba *hisi_hba,

diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c b/drivers/scsi/hisi_sas/hisi_sas_main.c
index 1797851..406ffa0 100644 (file)
--- a/drivers/scsi/hisi_sas/hisi_sas_main.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_main.c
@@ -98,6 +98,12 @@ void hisi_sas_slot_task_free(struct hisi_hba *hisi_hba, struct sas_task *task,
 }
 EXPORT_SYMBOL_GPL(hisi_sas_slot_task_free);
 
+static int hisi_sas_task_prep_smp(struct hisi_hba *hisi_hba,
+                                 struct hisi_sas_slot *slot)
+{
+       return hisi_hba->hw->prep_smp(hisi_hba, slot);
+}
+
 static int hisi_sas_task_prep_ssp(struct hisi_hba *hisi_hba,
                                  struct hisi_sas_slot *slot, int is_tmf,
                                  struct hisi_sas_tmf_task *tmf)
@@ -215,6 +221,9 @@ static int hisi_sas_task_prep(struct sas_task *task, struct hisi_hba *hisi_hba,
        memset(slot->cmd_hdr, 0, sizeof(struct hisi_sas_cmd_hdr));
 
        switch (task->task_proto) {
+       case SAS_PROTOCOL_SMP:
+               rc = hisi_sas_task_prep_smp(hisi_hba, slot);
+               break;
        case SAS_PROTOCOL_SSP:
                rc = hisi_sas_task_prep_ssp(hisi_hba, slot, is_tmf, tmf);
                break;

diff --git a/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c
index ad50aed..64b17a1 100644 (file)
--- a/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c
@@ -903,6 +903,74 @@ static int prep_prd_sge_v1_hw(struct hisi_hba *hisi_hba,
        return 0;
 }
 
+static int prep_smp_v1_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 */
+                              (1 << CMD_HDR_MODE_OFF) | /* ini mode */
+                              (2 << CMD_HDR_CMD_OFF)); /* smp */
+
+       /* map itct entry */
+       hdr->dw1 = cpu_to_le32(sas_dev->device_id << CMD_HDR_DEVICE_ID_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_v1_hw(struct hisi_hba *hisi_hba,
                          struct hisi_sas_slot *slot, int is_tmf,
@@ -1223,6 +1291,25 @@ static int slot_complete_v1_hw(struct hisi_hba *hisi_hba,
                sas_ssp_task_response(dev, task, iu);
                break;
        }
+       case SAS_PROTOCOL_SMP:
+       {
+               void *to;
+               struct scatterlist *sg_resp = &task->smp_task.smp_resp;
+
+               ts->stat = SAM_STAT_GOOD;
+               to = kmap_atomic(sg_page(sg_resp));
+
+               dma_unmap_sg(dev, &task->smp_task.smp_resp, 1,
+                            DMA_FROM_DEVICE);
+               dma_unmap_sg(dev, &task->smp_task.smp_req, 1,
+                            DMA_TO_DEVICE);
+               memcpy(to + sg_resp->offset,
+                      slot->status_buffer +
+                      sizeof(struct hisi_sas_err_record),
+                      sg_dma_len(sg_resp));
+               kunmap_atomic(to);
+               break;
+       }
        case SAS_PROTOCOL_SATA:
        case SAS_PROTOCOL_STP:
        case SAS_PROTOCOL_SATA | SAS_PROTOCOL_STP:
@@ -1595,6 +1682,7 @@ static const struct hisi_sas_hw hisi_sas_v1_hw = {
        .setup_itct = setup_itct_v1_hw,
        .sl_notify = sl_notify_v1_hw,
        .free_device = free_device_v1_hw,
+       .prep_smp = prep_smp_v1_hw,
        .prep_ssp = prep_ssp_v1_hw,
        .get_free_slot = get_free_slot_v1_hw,
        .start_delivery = start_delivery_v1_hw,