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Subject[PATCH v4 2/5] scsi: hisi_sas: Relocate some code to reduce complexity
Date
From: Xiang Chen <chenxiang66@hisilicon.com>

Relocate the codes related to dma_map/unmap in hisi_sas_task_prep()
to reduce complexity, with a view to add DIF/DIX support.

Signed-off-by: Xiang Chen <chenxiang66@hisilicon.com>
Signed-off-by: John Garry <john.garry@huawei.com>
---
drivers/scsi/hisi_sas/hisi_sas_main.c | 146 +++++++++++++++++++++-------------
1 file changed, 90 insertions(+), 56 deletions(-)

diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c b/drivers/scsi/hisi_sas/hisi_sas_main.c
index c39c91c..95350fd 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_main.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_main.c
@@ -296,6 +296,90 @@ static void hisi_sas_task_prep_abort(struct hisi_hba *hisi_hba,
device_id, abort_flag, tag_to_abort);
}

+static void hisi_sas_dma_unmap(struct hisi_hba *hisi_hba,
+ struct sas_task *task, int n_elem,
+ int n_elem_req, int n_elem_resp)
+{
+ struct device *dev = hisi_hba->dev;
+
+ if (!sas_protocol_ata(task->task_proto)) {
+ if (task->num_scatter) {
+ if (n_elem)
+ dma_unmap_sg(dev, task->scatter,
+ task->num_scatter,
+ task->data_dir);
+ } else if (task->task_proto & SAS_PROTOCOL_SMP) {
+ if (n_elem_req)
+ dma_unmap_sg(dev, &task->smp_task.smp_req,
+ 1, DMA_TO_DEVICE);
+ if (n_elem_resp)
+ dma_unmap_sg(dev, &task->smp_task.smp_resp,
+ 1, DMA_FROM_DEVICE);
+ }
+ }
+}
+
+static int hisi_sas_dma_map(struct hisi_hba *hisi_hba,
+ struct sas_task *task, int *n_elem,
+ int *n_elem_req, int *n_elem_resp)
+{
+ struct device *dev = hisi_hba->dev;
+ int rc;
+
+ if (sas_protocol_ata(task->task_proto)) {
+ *n_elem = task->num_scatter;
+ } else {
+ unsigned int req_len, resp_len;
+
+ if (task->num_scatter) {
+ *n_elem = dma_map_sg(dev, task->scatter,
+ task->num_scatter, task->data_dir);
+ if (!*n_elem) {
+ rc = -ENOMEM;
+ goto prep_out;
+ }
+ } else if (task->task_proto & SAS_PROTOCOL_SMP) {
+ *n_elem_req = dma_map_sg(dev, &task->smp_task.smp_req,
+ 1, DMA_TO_DEVICE);
+ if (!*n_elem_req) {
+ rc = -ENOMEM;
+ goto prep_out;
+ }
+ req_len = sg_dma_len(&task->smp_task.smp_req);
+ if (req_len & 0x3) {
+ rc = -EINVAL;
+ goto err_out_dma_unmap;
+ }
+ *n_elem_resp = dma_map_sg(dev, &task->smp_task.smp_resp,
+ 1, DMA_FROM_DEVICE);
+ if (!*n_elem_resp) {
+ rc = -ENOMEM;
+ goto err_out_dma_unmap;
+ }
+ resp_len = sg_dma_len(&task->smp_task.smp_resp);
+ if (resp_len & 0x3) {
+ rc = -EINVAL;
+ goto err_out_dma_unmap;
+ }
+ }
+ }
+
+ if (*n_elem > HISI_SAS_SGE_PAGE_CNT) {
+ dev_err(dev, "task prep: n_elem(%d) > HISI_SAS_SGE_PAGE_CNT",
+ *n_elem);
+ rc = -EINVAL;
+ goto err_out_dma_unmap;
+ }
+ return 0;
+
+err_out_dma_unmap:
+ /* It would be better to call dma_unmap_sg() here, but it's messy */
+ hisi_sas_dma_unmap(hisi_hba, task, *n_elem,
+ *n_elem_req, *n_elem_resp);
+prep_out:
+ return rc;
+}
+
static int hisi_sas_task_prep(struct sas_task *task,
struct hisi_sas_dq **dq_pointer,
bool is_tmf, struct hisi_sas_tmf_task *tmf,
@@ -338,49 +422,10 @@ static int hisi_sas_task_prep(struct sas_task *task,
return -ECOMM;
}

- if (!sas_protocol_ata(task->task_proto)) {
- unsigned int req_len, resp_len;
-
- if (task->num_scatter) {
- n_elem = dma_map_sg(dev, task->scatter,
- task->num_scatter, task->data_dir);
- if (!n_elem) {
- rc = -ENOMEM;
- goto prep_out;
- }
- } else if (task->task_proto & SAS_PROTOCOL_SMP) {
- n_elem_req = dma_map_sg(dev, &task->smp_task.smp_req,
- 1, DMA_TO_DEVICE);
- if (!n_elem_req) {
- rc = -ENOMEM;
- goto prep_out;
- }
- req_len = sg_dma_len(&task->smp_task.smp_req);
- if (req_len & 0x3) {
- rc = -EINVAL;
- goto err_out_dma_unmap;
- }
- n_elem_resp = dma_map_sg(dev, &task->smp_task.smp_resp,
- 1, DMA_FROM_DEVICE);
- if (!n_elem_resp) {
- rc = -ENOMEM;
- goto err_out_dma_unmap;
- }
- resp_len = sg_dma_len(&task->smp_task.smp_resp);
- if (resp_len & 0x3) {
- rc = -EINVAL;
- goto err_out_dma_unmap;
- }
- }
- } else
- n_elem = task->num_scatter;
-
- if (n_elem > HISI_SAS_SGE_PAGE_CNT) {
- dev_err(dev, "task prep: n_elem(%d) > HISI_SAS_SGE_PAGE_CNT",
- n_elem);
- rc = -EINVAL;
- goto err_out_dma_unmap;
- }
+ rc = hisi_sas_dma_map(hisi_hba, task, &n_elem,
+ &n_elem_req, &n_elem_resp);
+ if (rc < 0)
+ goto prep_out;

if (hisi_hba->hw->slot_index_alloc)
rc = hisi_hba->hw->slot_index_alloc(hisi_hba, device);
@@ -465,19 +510,8 @@ static int hisi_sas_task_prep(struct sas_task *task,
err_out_tag:
hisi_sas_slot_index_free(hisi_hba, slot_idx);
err_out_dma_unmap:
- if (!sas_protocol_ata(task->task_proto)) {
- if (task->num_scatter) {
- dma_unmap_sg(dev, task->scatter, task->num_scatter,
- task->data_dir);
- } else if (task->task_proto & SAS_PROTOCOL_SMP) {
- if (n_elem_req)
- dma_unmap_sg(dev, &task->smp_task.smp_req,
- 1, DMA_TO_DEVICE);
- if (n_elem_resp)
- dma_unmap_sg(dev, &task->smp_task.smp_resp,
- 1, DMA_FROM_DEVICE);
- }
- }
+ hisi_sas_dma_unmap(hisi_hba, task, n_elem,
+ n_elem_req, n_elem_resp);
prep_out:
dev_err(dev, "task prep: failed[%d]!\n", rc);
return rc;
--
1.9.1
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