[PATCH 20/25] scsi: hisi_sas: add smp protocol support

John Garry
2015-10-12T15:20:32Z

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

Signed-off-by: John Garry <john.garry-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
---
drivers/scsi/hisi_sas/hisi_sas.h | 4 ++
drivers/scsi/hisi_sas/hisi_sas_main.c | 9 +++-
drivers/scsi/hisi_sas/hisi_sas_v1_hw.c | 97 +++++++++++++++++++++++++++++++++-
3 files changed, 107 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/hisi_sas/hisi_sas.h b/drivers/scsi/hisi_sas/hisi_sas.h
index 265d9bd..be2cdf5 100644
--- a/drivers/scsi/hisi_sas/hisi_sas.h
+++ b/drivers/scsi/hisi_sas/hisi_sas.h
@@ -34,6 +34,8 @@
(((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
#define HISI_SAS_RESET_REG_CNT 5

@@ -372,6 +374,8 @@ extern int get_free_slot_v1_hw(struct hisi_hba *hisi_hba, int *q, int *s);
extern int prep_ssp_v1_hw(struct hisi_hba *hisi_hba,
struct hisi_sas_tei *tei, int is_tmf,
struct hisi_sas_tmf_task *tmf);
+extern int prep_smp_v1_hw(struct hisi_hba *hisi_hba,
+ struct hisi_sas_tei *tei);
extern int interrupt_init_v1_hw(struct hisi_hba *hisi_hba);
extern int interrupt_openall_v1_hw(struct hisi_hba *hisi_hba);
extern int hw_init_v1_hw(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 36ef8cd..91620b0 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_main.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_main.c
@@ -109,6 +109,11 @@ void hisi_sas_slot_task_free(struct hisi_hba *hisi_hba,
memset(slot, 0, sizeof(*slot));
}

+static int hisi_sas_task_prep_smp(struct hisi_hba *hisi_hba,
+ struct hisi_sas_tei *tei)
+{
+ return prep_smp_v1_hw(hisi_hba, tei);
+}

static int hisi_sas_task_prep_ssp(struct hisi_hba *hisi_hba,
struct hisi_sas_tei *tei, int is_tmf,
@@ -235,10 +240,12 @@ static int hisi_sas_task_prep(struct sas_task *task,
tei.n_elem = n_elem;
tei.slot = slot;
switch (task->task_proto) {
+ case SAS_PROTOCOL_SMP:
+ rc = hisi_sas_task_prep_smp(hisi_hba, &tei);
+ break;
case SAS_PROTOCOL_SSP:
rc = hisi_sas_task_prep_ssp(hisi_hba, &tei, is_tmf, tmf);
break;
- case SAS_PROTOCOL_SMP:
case SAS_PROTOCOL_SATA:
case SAS_PROTOCOL_STP:
case SAS_PROTOCOL_SATA | SAS_PROTOCOL_STP:
diff --git a/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c
index 2ad2ffa..b470c72 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c
@@ -913,6 +913,80 @@ static int prep_prd_sge_v1_hw(struct hisi_hba *hisi_hba,
return 0;
}

+int prep_smp_v1_hw(struct hisi_hba *hisi_hba,
+ struct hisi_sas_tei *tei)
+{
+ struct sas_task *task = tei->task;
+ struct hisi_sas_cmd_hdr *hdr = tei->hdr;
+ struct domain_device *device = task->dev;
+ struct device *dev = &hisi_hba->pdev->dev;
+ struct hisi_sas_port *port = tei->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;
+ struct hisi_sas_slot *slot = tei->slot;
+
+ /*
+ * 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(tei->iptt << CMD_HDR_IPTT_OFF);
+
+ hdr->cmd_table_addr_lo = cpu_to_le32(lower_32_bits(req_dma_addr));
+ hdr->cmd_table_addr_hi = cpu_to_le32(upper_32_bits(req_dma_addr));
+
+ hdr->sts_buffer_addr_lo =
+ cpu_to_le32(lower_32_bits(slot->status_buffer_dma));
+ hdr->sts_buffer_addr_hi =
+ cpu_to_le32(upper_32_bits(slot->status_buffer_dma));
+
+ return 0;
+
+err_out_resp:
+ dma_unmap_sg(dev, &tei->task->smp_task.smp_resp, 1,
+ DMA_FROM_DEVICE);
+err_out_req:
+ dma_unmap_sg(dev, &tei->task->smp_task.smp_req, 1,
+ DMA_TO_DEVICE);
+ return rc;
+}

int prep_ssp_v1_hw(struct hisi_hba *hisi_hba,
struct hisi_sas_tei *tei, int is_tmf,
@@ -1132,11 +1206,14 @@ static void slot_err_v1_hw(struct hisi_hba *hisi_hba,
}
break;
case SAS_PROTOCOL_SMP:
+ tstat->stat = SAM_STAT_CHECK_CONDITION;
+ break;
+
case SAS_PROTOCOL_SATA:
case SAS_PROTOCOL_STP:
case SAS_PROTOCOL_SATA | SAS_PROTOCOL_STP:
{
- dev_err(dev, "slot err: SMP/SATA/STP not supported");
+ dev_err(dev, "slot err: SATA/STP not supported");
}
break;
default:
@@ -1245,8 +1322,24 @@ int slot_complete_v1_hw(struct hisi_hba *hisi_hba,
break;
}
case SAS_PROTOCOL_SMP:
- dev_err(dev, "slot complete: SMP not supported");
+ {
+ void *to;
+ struct scatterlist *sg_resp = &task->smp_task.smp_resp;
+
+ tstat->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:
--
1.9.1

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