[PATCH 2/4] mpi3mr: Support for preallocation of SGL BSG data buffers part-2

Chandrakanth patil
2023-12-05T19:15:45Z

[-- Attachment #1: Type: text/plain, Size: 21902 bytes --]

The Driver acquires the required SGLs from the pre-allocated
pool.

Signed-off-by: Sathya Prakash <sathya.prakash@broadcom.com>
Signed-off-by: Chandrakanth patil <chandrakanth.patil@broadcom.com>
---
drivers/scsi/mpi3mr/mpi3mr.h | 2 +
drivers/scsi/mpi3mr/mpi3mr_app.c | 396 ++++++++++++++++++++++++-------
2 files changed, 313 insertions(+), 85 deletions(-)

diff --git a/drivers/scsi/mpi3mr/mpi3mr.h b/drivers/scsi/mpi3mr/mpi3mr.h
index 8fce57894f8f..dfff3df3a666 100644
--- a/drivers/scsi/mpi3mr/mpi3mr.h
+++ b/drivers/scsi/mpi3mr/mpi3mr.h
@@ -247,6 +247,8 @@ struct mpi3mr_buf_map {
u32 kern_buf_len;
dma_addr_t kern_buf_dma;
u8 data_dir;
+ u16 num_dma_desc;
+ struct dma_memory_desc *dma_desc;
};

/* IOC State definitions */
diff --git a/drivers/scsi/mpi3mr/mpi3mr_app.c b/drivers/scsi/mpi3mr/mpi3mr_app.c
index 9dacbb8570c9..e8b0b121a6e3 100644
--- a/drivers/scsi/mpi3mr/mpi3mr_app.c
+++ b/drivers/scsi/mpi3mr/mpi3mr_app.c
@@ -563,8 +563,37 @@ static long mpi3mr_bsg_process_drv_cmds(struct bsg_job *job)
return rval;
}

+/**
+ * mpi3mr_total_num_ioctl_sges - Count number of SGEs required
+ * @drv_bufs: DMA address of the buffers to be placed in sgl
+ * @bufcnt: Number of DMA buffers
+ *
+ * This function returns total number of data SGEs required
+ * including zero length SGEs and excluding management request
+ * and response buffer for the given list of data buffer
+ * descriptors
+ *
+ * Return: Number of SGE elements needed
+ */
+static inline u16 mpi3mr_total_num_ioctl_sges(struct mpi3mr_buf_map *drv_bufs,
+ u8 bufcnt)
+{
+ u16 i, sge_count = 0;
+
+ for (i = 0; i < bufcnt; i++, drv_bufs++) {
+ if (drv_bufs->data_dir == DMA_NONE ||
+ drv_bufs->kern_buf)
+ continue;
+ sge_count += drv_bufs->num_dma_desc;
+ if (!drv_bufs->num_dma_desc)
+ sge_count++;
+ }
+ return sge_count;
+}
+
/**
* mpi3mr_bsg_build_sgl - SGL construction for MPI commands
+ * @mrioc: Adapter instance reference
* @mpi_req: MPI request
* @sgl_offset: offset to start sgl in the MPI request
* @drv_bufs: DMA address of the buffers to be placed in sgl
@@ -576,27 +605,45 @@ static long mpi3mr_bsg_process_drv_cmds(struct bsg_job *job)
* This function places the DMA address of the given buffers in
* proper format as SGEs in the given MPI request.
*
- * Return: Nothing
+ * Return: 0 on success,-1 on failure
*/
-static void mpi3mr_bsg_build_sgl(u8 *mpi_req, uint32_t sgl_offset,
- struct mpi3mr_buf_map *drv_bufs, u8 bufcnt, u8 is_rmc,
- u8 is_rmr, u8 num_datasges)
+static int mpi3mr_bsg_build_sgl(struct mpi3mr_ioc *mrioc, u8 *mpi_req,
+ u32 sgl_offset, struct mpi3mr_buf_map *drv_bufs,
+ u8 bufcnt, u8 is_rmc, u8 is_rmr, u8 num_datasges)
{
+ struct mpi3_request_header *mpi_header =
+ (struct mpi3_request_header *)mpi_req;
u8 *sgl = (mpi_req + sgl_offset), count = 0;
struct mpi3_mgmt_passthrough_request *rmgmt_req =
(struct mpi3_mgmt_passthrough_request *)mpi_req;
struct mpi3mr_buf_map *drv_buf_iter = drv_bufs;
- u8 sgl_flags, sgl_flags_last;
+ u8 flag, sgl_flags, sgl_flag_eob, sgl_flags_last, last_chain_sgl_flag;
+ u16 available_sges, i, sges_needed;
+ u32 sge_element_size = sizeof(struct mpi3_sge_common);
+ bool chain_used = false;

sgl_flags = MPI3_SGE_FLAGS_ELEMENT_TYPE_SIMPLE |
- MPI3_SGE_FLAGS_DLAS_SYSTEM | MPI3_SGE_FLAGS_END_OF_BUFFER;
- sgl_flags_last = sgl_flags | MPI3_SGE_FLAGS_END_OF_LIST;
+ MPI3_SGE_FLAGS_DLAS_SYSTEM;
+ sgl_flag_eob = sgl_flags | MPI3_SGE_FLAGS_END_OF_BUFFER;
+ sgl_flags_last = sgl_flag_eob | MPI3_SGE_FLAGS_END_OF_LIST;
+ last_chain_sgl_flag = MPI3_SGE_FLAGS_ELEMENT_TYPE_LAST_CHAIN |
+ MPI3_SGE_FLAGS_DLAS_SYSTEM;
+
+ sges_needed = mpi3mr_total_num_ioctl_sges(drv_bufs, bufcnt);

if (is_rmc) {
mpi3mr_add_sg_single(&rmgmt_req->command_sgl,
sgl_flags_last, drv_buf_iter->kern_buf_len,
drv_buf_iter->kern_buf_dma);
- sgl = (u8 *)drv_buf_iter->kern_buf + drv_buf_iter->bsg_buf_len;
+ sgl = (u8 *)drv_buf_iter->kern_buf +
+ drv_buf_iter->bsg_buf_len;
+ available_sges = (drv_buf_iter->kern_buf_len -
+ drv_buf_iter->bsg_buf_len) / sge_element_size;
+
+ if (sges_needed > available_sges)
+ return -1;
+
+ chain_used = true;
drv_buf_iter++;
count++;
if (is_rmr) {
@@ -608,23 +655,95 @@ static void mpi3mr_bsg_build_sgl(u8 *mpi_req, uint32_t sgl_offset,
} else
mpi3mr_build_zero_len_sge(
&rmgmt_req->response_sgl);
+ if (num_datasges) {
+ i = 0;
+ goto build_sges;
+ }
+ } else {
+ if (sgl_offset >= MPI3MR_ADMIN_REQ_FRAME_SZ)
+ return -1;
+ available_sges = (MPI3MR_ADMIN_REQ_FRAME_SZ - sgl_offset) /
+ sge_element_size;
+ if (!available_sges)
+ return -1;
}
if (!num_datasges) {
mpi3mr_build_zero_len_sge(sgl);
- return;
+ return 0;
}
+ if (mpi_header->function == MPI3_BSG_FUNCTION_SMP_PASSTHROUGH) {
+ if ((sges_needed > 2) || (sges_needed > available_sges))
+ return -1;
+ for (; count < bufcnt; count++, drv_buf_iter++) {
+ if (drv_buf_iter->data_dir == DMA_NONE ||
+ !drv_buf_iter->num_dma_desc)
+ continue;
+ mpi3mr_add_sg_single(sgl, sgl_flags_last,
+ drv_buf_iter->dma_desc[0].size,
+ drv_buf_iter->dma_desc[0].dma_addr);
+ sgl += sge_element_size;
+ }
+ return 0;
+ }
+ i = 0;
+
+build_sges:
for (; count < bufcnt; count++, drv_buf_iter++) {
if (drv_buf_iter->data_dir == DMA_NONE)
continue;
- if (num_datasges == 1 || !is_rmc)
- mpi3mr_add_sg_single(sgl, sgl_flags_last,
- drv_buf_iter->kern_buf_len, drv_buf_iter->kern_buf_dma);
- else
- mpi3mr_add_sg_single(sgl, sgl_flags,
- drv_buf_iter->kern_buf_len, drv_buf_iter->kern_buf_dma);
- sgl += sizeof(struct mpi3_sge_common);
+ if (!drv_buf_iter->num_dma_desc) {
+ if (chain_used && !available_sges)
+ return -1;
+ if (!chain_used && (available_sges == 1) &&
+ (sges_needed > 1))
+ goto setup_chain;
+ flag = sgl_flag_eob;
+ if (num_datasges == 1)
+ flag = sgl_flags_last;
+ mpi3mr_add_sg_single(sgl, flag, 0, 0);
+ sgl += sge_element_size;
+ sges_needed--;
+ available_sges--;
+ num_datasges--;
+ continue;
+ }
+ for (; i < drv_buf_iter->num_dma_desc; i++) {
+ if (chain_used && !available_sges)
+ return -1;
+ if (!chain_used && (available_sges == 1) &&
+ (sges_needed > 1))
+ goto setup_chain;
+ flag = sgl_flags;
+ if (i == (drv_buf_iter->num_dma_desc - 1)) {
+ if (num_datasges == 1)
+ flag = sgl_flags_last;
+ else
+ flag = sgl_flag_eob;
+ }
+
+ mpi3mr_add_sg_single(sgl, flag,
+ drv_buf_iter->dma_desc[i].size,
+ drv_buf_iter->dma_desc[i].dma_addr);
+ sgl += sge_element_size;
+ available_sges--;
+ sges_needed--;
+ }
num_datasges--;
+ i = 0;
}
+ return 0;
+
+setup_chain:
+ available_sges = mrioc->ioctl_chain_sge.size / sge_element_size;
+ if (sges_needed > available_sges)
+ return -1;
+ mpi3mr_add_sg_single(sgl, last_chain_sgl_flag,
+ (sges_needed * sge_element_size),
+ mrioc->ioctl_chain_sge.dma_addr);
+ memset(mrioc->ioctl_chain_sge.addr, 0, mrioc->ioctl_chain_sge.size);
+ sgl = (u8 *)mrioc->ioctl_chain_sge.addr;
+ chain_used = true;
+ goto build_sges;
}

/**
@@ -935,10 +1054,66 @@ static int mpi3mr_build_nvme_prp(struct mpi3mr_ioc *mrioc,
}
return -1;
}
+
+/**
+ * mpi3mr_map_data_buffer_dma - build dma descriptors for data
+ * buffers
+ * @mrioc: Adapter instance reference
+ * @drv_buf: buffer map descriptor
+ * @desc_count: Number of already consumed dma descriptors
+ *
+ * This function computes how many pre-allocated DMA descriptors
+ * are required for the given data buffer and if those number of
+ * descriptors are free, then setup the mapping of the scattered
+ * DMA address to the given data buffer, if the data direction
+ * of the buffer is DMA_TO_DEVICE then the actual data is copied to
+ * the DMA buffers
+ *
+ * Return: 0 on success, -1 on failure
+ */
+static int mpi3mr_map_data_buffer_dma(struct mpi3mr_ioc *mrioc,
+ struct mpi3mr_buf_map *drv_buf,
+ u16 desc_count)
+{
+ u16 i, needed_desc = drv_buf->kern_buf_len / MPI3MR_IOCTL_SGE_SIZE;
+ u32 buf_len = drv_buf->kern_buf_len, copied_len = 0;
+
+ if (drv_buf->kern_buf_len % MPI3MR_IOCTL_SGE_SIZE)
+ needed_desc++;
+ if ((needed_desc + desc_count) > MPI3MR_NUM_IOCTL_SGE) {
+ dprint_bsg_err(mrioc, "%s: DMA descriptor mapping error %d:%d:%d\n",
+ __func__, needed_desc, desc_count, MPI3MR_NUM_IOCTL_SGE);
+ return -1;
+ }
+ drv_buf->dma_desc = kzalloc(sizeof(*drv_buf->dma_desc) * needed_desc,
+ GFP_KERNEL);
+ if (!drv_buf->dma_desc)
+ return -1;
+ for (i = 0; i < needed_desc; i++, desc_count++) {
+ drv_buf->dma_desc[i].addr = mrioc->ioctl_sge[desc_count].addr;
+ drv_buf->dma_desc[i].dma_addr =
+ mrioc->ioctl_sge[desc_count].dma_addr;
+ if (buf_len < mrioc->ioctl_sge[desc_count].size)
+ drv_buf->dma_desc[i].size = buf_len;
+ else
+ drv_buf->dma_desc[i].size =
+ mrioc->ioctl_sge[desc_count].size;
+ buf_len -= drv_buf->dma_desc[i].size;
+ memset(drv_buf->dma_desc[i].addr, 0,
+ mrioc->ioctl_sge[desc_count].size);
+ if (drv_buf->data_dir == DMA_TO_DEVICE) {
+ memcpy(drv_buf->dma_desc[i].addr,
+ drv_buf->bsg_buf + copied_len,
+ drv_buf->dma_desc[i].size);
+ copied_len += drv_buf->dma_desc[i].size;
+ }
+ }
+ drv_buf->num_dma_desc = needed_desc;
+ return 0;
+}
/**
* mpi3mr_bsg_process_mpt_cmds - MPI Pass through BSG handler
* @job: BSG job reference
- * @reply_payload_rcv_len: length of payload recvd
*
* This function is the top level handler for MPI Pass through
* command, this does basic validation of the input data buffers,
@@ -954,10 +1129,9 @@ static int mpi3mr_build_nvme_prp(struct mpi3mr_ioc *mrioc,
* Return: 0 on success and proper error codes on failure
*/

-static long mpi3mr_bsg_process_mpt_cmds(struct bsg_job *job, unsigned int *reply_payload_rcv_len)
+static long mpi3mr_bsg_process_mpt_cmds(struct bsg_job *job)
{
long rval = -EINVAL;
-
struct mpi3mr_ioc *mrioc = NULL;
u8 *mpi_req = NULL, *sense_buff_k = NULL;
u8 mpi_msg_size = 0;
@@ -965,9 +1139,10 @@ static long mpi3mr_bsg_process_mpt_cmds(struct bsg_job *job, unsigned int *reply
struct mpi3mr_bsg_mptcmd *karg;
struct mpi3mr_buf_entry *buf_entries = NULL;
struct mpi3mr_buf_map *drv_bufs = NULL, *drv_buf_iter = NULL;
- u8 count, bufcnt = 0, is_rmcb = 0, is_rmrb = 0, din_cnt = 0, dout_cnt = 0;
- u8 invalid_be = 0, erb_offset = 0xFF, mpirep_offset = 0xFF, sg_entries = 0;
- u8 block_io = 0, resp_code = 0, nvme_fmt = 0;
+ u8 count, bufcnt = 0, is_rmcb = 0, is_rmrb = 0;
+ u8 din_cnt = 0, dout_cnt = 0;
+ u8 invalid_be = 0, erb_offset = 0xFF, mpirep_offset = 0xFF;
+ u8 block_io = 0, nvme_fmt = 0, resp_code = 0;
struct mpi3_request_header *mpi_header = NULL;
struct mpi3_status_reply_descriptor *status_desc;
struct mpi3_scsi_task_mgmt_request *tm_req;
@@ -979,6 +1154,7 @@ static long mpi3mr_bsg_process_mpt_cmds(struct bsg_job *job, unsigned int *reply
u32 din_size = 0, dout_size = 0;
u8 *din_buf = NULL, *dout_buf = NULL;
u8 *sgl_iter = NULL, *sgl_din_iter = NULL, *sgl_dout_iter = NULL;
+ u16 rmc_size = 0, desc_count = 0;

bsg_req = job->request;
karg = (struct mpi3mr_bsg_mptcmd *)&bsg_req->cmd.mptcmd;
@@ -987,6 +1163,12 @@ static long mpi3mr_bsg_process_mpt_cmds(struct bsg_job *job, unsigned int *reply
if (!mrioc)
return -ENODEV;

+ if (!mrioc->ioctl_sges_allocated) {
+ dprint_bsg_err(mrioc, "%s: DMA memory was not allocated\n",
+ __func__);
+ return -ENOMEM;
+ }
+
if (karg->timeout < MPI3MR_APP_DEFAULT_TIMEOUT)
karg->timeout = MPI3MR_APP_DEFAULT_TIMEOUT;

@@ -1027,26 +1209,13 @@ static long mpi3mr_bsg_process_mpt_cmds(struct bsg_job *job, unsigned int *reply

for (count = 0; count < bufcnt; count++, buf_entries++, drv_buf_iter++) {

- if (sgl_dout_iter > (dout_buf + job->request_payload.payload_len)) {
- dprint_bsg_err(mrioc, "%s: data_out buffer length mismatch\n",
- __func__);
- rval = -EINVAL;
- goto out;
- }
- if (sgl_din_iter > (din_buf + job->reply_payload.payload_len)) {
- dprint_bsg_err(mrioc, "%s: data_in buffer length mismatch\n",
- __func__);
- rval = -EINVAL;
- goto out;
- }
-
switch (buf_entries->buf_type) {
case MPI3MR_BSG_BUFTYPE_RAIDMGMT_CMD:
sgl_iter = sgl_dout_iter;
sgl_dout_iter += buf_entries->buf_len;
drv_buf_iter->data_dir = DMA_TO_DEVICE;
is_rmcb = 1;
- if (count != 0)
+ if ((count != 0) || !buf_entries->buf_len)
invalid_be = 1;
break;
case MPI3MR_BSG_BUFTYPE_RAIDMGMT_RESP:
@@ -1054,7 +1223,7 @@ static long mpi3mr_bsg_process_mpt_cmds(struct bsg_job *job, unsigned int *reply
sgl_din_iter += buf_entries->buf_len;
drv_buf_iter->data_dir = DMA_FROM_DEVICE;
is_rmrb = 1;
- if (count != 1 || !is_rmcb)
+ if (count != 1 || !is_rmcb || !buf_entries->buf_len)
invalid_be = 1;
break;
case MPI3MR_BSG_BUFTYPE_DATA_IN:
@@ -1062,7 +1231,7 @@ static long mpi3mr_bsg_process_mpt_cmds(struct bsg_job *job, unsigned int *reply
sgl_din_iter += buf_entries->buf_len;
drv_buf_iter->data_dir = DMA_FROM_DEVICE;
din_cnt++;
- din_size += drv_buf_iter->bsg_buf_len;
+ din_size += buf_entries->buf_len;
if ((din_cnt > 1) && !is_rmcb)
invalid_be = 1;
break;
@@ -1071,7 +1240,7 @@ static long mpi3mr_bsg_process_mpt_cmds(struct bsg_job *job, unsigned int *reply
sgl_dout_iter += buf_entries->buf_len;
drv_buf_iter->data_dir = DMA_TO_DEVICE;
dout_cnt++;
- dout_size += drv_buf_iter->bsg_buf_len;
+ dout_size += buf_entries->buf_len;
if ((dout_cnt > 1) && !is_rmcb)
invalid_be = 1;
break;
@@ -1080,12 +1249,16 @@ static long mpi3mr_bsg_process_mpt_cmds(struct bsg_job *job, unsigned int *reply
sgl_din_iter += buf_entries->buf_len;
drv_buf_iter->data_dir = DMA_NONE;
mpirep_offset = count;
+ if (!buf_entries->buf_len)
+ invalid_be = 1;
break;
case MPI3MR_BSG_BUFTYPE_ERR_RESPONSE:
sgl_iter = sgl_din_iter;
sgl_din_iter += buf_entries->buf_len;
drv_buf_iter->data_dir = DMA_NONE;
erb_offset = count;
+ if (!buf_entries->buf_len)
+ invalid_be = 1;
break;
case MPI3MR_BSG_BUFTYPE_MPI_REQUEST:
sgl_iter = sgl_dout_iter;
@@ -1112,21 +1285,31 @@ static long mpi3mr_bsg_process_mpt_cmds(struct bsg_job *job, unsigned int *reply
goto out;
}

- drv_buf_iter->bsg_buf = sgl_iter;
- drv_buf_iter->bsg_buf_len = buf_entries->buf_len;
-
- }
- if (!is_rmcb && (dout_cnt || din_cnt)) {
- sg_entries = dout_cnt + din_cnt;
- if (((mpi_msg_size) + (sg_entries *
- sizeof(struct mpi3_sge_common))) > MPI3MR_ADMIN_REQ_FRAME_SZ) {
- dprint_bsg_err(mrioc,
- "%s:%d: invalid message size passed\n",
- __func__, __LINE__);
+ if (sgl_dout_iter > (dout_buf + job->request_payload.payload_len)) {
+ dprint_bsg_err(mrioc, "%s: data_out buffer length mismatch\n",
+ __func__);
rval = -EINVAL;
goto out;
}
+ if (sgl_din_iter > (din_buf + job->reply_payload.payload_len)) {
+ dprint_bsg_err(mrioc, "%s: data_in buffer length mismatch\n",
+ __func__);
+ rval = -EINVAL;
+ goto out;
+ }
+
+ drv_buf_iter->bsg_buf = sgl_iter;
+ drv_buf_iter->bsg_buf_len = buf_entries->buf_len;
}
+
+ if (is_rmcb && ((din_size + dout_size) > MPI3MR_MAX_APP_XFER_SIZE)) {
+ dprint_bsg_err(mrioc, "%s:%d: invalid data transfer size passed for function 0x%x din_size = %d, dout_size = %d\n",
+ __func__, __LINE__, mpi_header->function, din_size,
+ dout_size);
+ rval = -EINVAL;
+ goto out;
+ }
+
if (din_size > MPI3MR_MAX_APP_XFER_SIZE) {
dprint_bsg_err(mrioc,
"%s:%d: invalid data transfer size passed for function 0x%x din_size=%d\n",
@@ -1142,30 +1325,64 @@ static long mpi3mr_bsg_process_mpt_cmds(struct bsg_job *job, unsigned int *reply
goto out;
}

+ if (mpi_header->function == MPI3_BSG_FUNCTION_SMP_PASSTHROUGH) {
+ if (din_size > MPI3MR_IOCTL_SGE_SIZE ||
+ dout_size > MPI3MR_IOCTL_SGE_SIZE) {
+ dprint_bsg_err(mrioc, "%s:%d: invalid message size passed:%d:%d:%d:%d\n",
+ __func__, __LINE__, din_cnt, dout_cnt, din_size,
+ dout_size);
+ rval = -EINVAL;
+ goto out;
+ }
+ }
+
drv_buf_iter = drv_bufs;
for (count = 0; count < bufcnt; count++, drv_buf_iter++) {
if (drv_buf_iter->data_dir == DMA_NONE)
continue;

drv_buf_iter->kern_buf_len = drv_buf_iter->bsg_buf_len;
- if (is_rmcb && !count)
- drv_buf_iter->kern_buf_len += ((dout_cnt + din_cnt) *
- sizeof(struct mpi3_sge_common));
-
- if (!drv_buf_iter->kern_buf_len)
- continue;
-
- drv_buf_iter->kern_buf = dma_alloc_coherent(&mrioc->pdev->dev,
- drv_buf_iter->kern_buf_len, &drv_buf_iter->kern_buf_dma,
- GFP_KERNEL);
- if (!drv_buf_iter->kern_buf) {
- rval = -ENOMEM;
- goto out;
- }
- if (drv_buf_iter->data_dir == DMA_TO_DEVICE) {
+ if (is_rmcb && !count) {
+ drv_buf_iter->kern_buf_len =
+ mrioc->ioctl_chain_sge.size;
+ drv_buf_iter->kern_buf =
+ mrioc->ioctl_chain_sge.addr;
+ drv_buf_iter->kern_buf_dma =
+ mrioc->ioctl_chain_sge.dma_addr;
+ drv_buf_iter->dma_desc = NULL;
+ drv_buf_iter->num_dma_desc = 0;
+ memset(drv_buf_iter->kern_buf, 0,
+ drv_buf_iter->kern_buf_len);
tmplen = min(drv_buf_iter->kern_buf_len,
- drv_buf_iter->bsg_buf_len);
+ drv_buf_iter->bsg_buf_len);
+ rmc_size = tmplen;
memcpy(drv_buf_iter->kern_buf, drv_buf_iter->bsg_buf, tmplen);
+ } else if (is_rmrb && (count == 1)) {
+ drv_buf_iter->kern_buf_len =
+ mrioc->ioctl_resp_sge.size;
+ drv_buf_iter->kern_buf =
+ mrioc->ioctl_resp_sge.addr;
+ drv_buf_iter->kern_buf_dma =
+ mrioc->ioctl_resp_sge.dma_addr;
+ drv_buf_iter->dma_desc = NULL;
+ drv_buf_iter->num_dma_desc = 0;
+ memset(drv_buf_iter->kern_buf, 0,
+ drv_buf_iter->kern_buf_len);
+ tmplen = min(drv_buf_iter->kern_buf_len,
+ drv_buf_iter->bsg_buf_len);
+ drv_buf_iter->kern_buf_len = tmplen;
+ memset(drv_buf_iter->bsg_buf, 0,
+ drv_buf_iter->bsg_buf_len);
+ } else {
+ if (!drv_buf_iter->kern_buf_len)
+ continue;
+ if (mpi3mr_map_data_buffer_dma(mrioc, drv_buf_iter, desc_count)) {
+ rval = -ENOMEM;
+ dprint_bsg_err(mrioc, "%s:%d: mapping data buffers failed\n",
+ __func__, __LINE__);
+ goto out;
+ }
+ desc_count += drv_buf_iter->num_dma_desc;
}
}

@@ -1235,9 +1452,14 @@ static long mpi3mr_bsg_process_mpt_cmds(struct bsg_job *job, unsigned int *reply
goto out;
}
} else {
- mpi3mr_bsg_build_sgl(mpi_req, (mpi_msg_size),
- drv_bufs, bufcnt, is_rmcb, is_rmrb,
- (dout_cnt + din_cnt));
+ if (mpi3mr_bsg_build_sgl(mrioc, mpi_req, mpi_msg_size,
+ drv_bufs, bufcnt, is_rmcb, is_rmrb,
+ (dout_cnt + din_cnt))) {
+ dprint_bsg_err(mrioc, "%s: sgl build failed\n", __func__);
+ rval = -EAGAIN;
+ mutex_unlock(&mrioc->bsg_cmds.mutex);
+ goto out;
+ }
}

if (mpi_header->function == MPI3_BSG_FUNCTION_SCSI_TASK_MGMT) {
@@ -1273,7 +1495,7 @@ static long mpi3mr_bsg_process_mpt_cmds(struct bsg_job *job, unsigned int *reply
if (mpi_header->function == MPI3_BSG_FUNCTION_MGMT_PASSTHROUGH) {
drv_buf_iter = &drv_bufs[0];
dprint_dump(drv_buf_iter->kern_buf,
- drv_buf_iter->kern_buf_len, "mpi3_mgmt_req");
+ rmc_size, "mpi3_mgmt_req");
}
}

@@ -1308,10 +1530,9 @@ static long mpi3mr_bsg_process_mpt_cmds(struct bsg_job *job, unsigned int *reply
MPI3_BSG_FUNCTION_MGMT_PASSTHROUGH) {
drv_buf_iter = &drv_bufs[0];
dprint_dump(drv_buf_iter->kern_buf,
- drv_buf_iter->kern_buf_len, "mpi3_mgmt_req");
+ rmc_size, "mpi3_mgmt_req");
}
}
-
if ((mpi_header->function == MPI3_BSG_FUNCTION_NVME_ENCAPSULATED) ||
(mpi_header->function == MPI3_BSG_FUNCTION_SCSI_IO))
mpi3mr_issue_tm(mrioc,
@@ -1382,17 +1603,27 @@ static long mpi3mr_bsg_process_mpt_cmds(struct bsg_job *job, unsigned int *reply
for (count = 0; count < bufcnt; count++, drv_buf_iter++) {
if (drv_buf_iter->data_dir == DMA_NONE)
continue;
- if (drv_buf_iter->data_dir == DMA_FROM_DEVICE) {
- tmplen = min(drv_buf_iter->kern_buf_len,
- drv_buf_iter->bsg_buf_len);
+ if ((count == 1) && is_rmrb) {
memcpy(drv_buf_iter->bsg_buf,
- drv_buf_iter->kern_buf, tmplen);
+ drv_buf_iter->kern_buf,
+ drv_buf_iter->kern_buf_len);
+ } else if (drv_buf_iter->data_dir == DMA_FROM_DEVICE) {
+ tmplen = 0;
+ for (desc_count = 0;
+ desc_count < drv_buf_iter->num_dma_desc;
+ desc_count++) {
+ memcpy(((u8 *)drv_buf_iter->bsg_buf + tmplen),
+ drv_buf_iter->dma_desc[desc_count].addr,
+ drv_buf_iter->dma_desc[desc_count].size);
+ tmplen +=
+ drv_buf_iter->dma_desc[desc_count].size;
}
}
+ }

out_unlock:
if (din_buf) {
- *reply_payload_rcv_len =
+ job->reply_payload_rcv_len =
sg_copy_from_buffer(job->reply_payload.sg_list,
job->reply_payload.sg_cnt,
din_buf, job->reply_payload.payload_len);
@@ -1408,13 +1639,8 @@ static long mpi3mr_bsg_process_mpt_cmds(struct bsg_job *job, unsigned int *reply
kfree(mpi_req);
if (drv_bufs) {
drv_buf_iter = drv_bufs;
- for (count = 0; count < bufcnt; count++, drv_buf_iter++) {
- if (drv_buf_iter->kern_buf && drv_buf_iter->kern_buf_dma)
- dma_free_coherent(&mrioc->pdev->dev,
- drv_buf_iter->kern_buf_len,
- drv_buf_iter->kern_buf,
- drv_buf_iter->kern_buf_dma);
- }
+ for (count = 0; count < bufcnt; count++, drv_buf_iter++)
+ kfree(drv_buf_iter->dma_desc);
kfree(drv_bufs);
}
kfree(bsg_reply_buf);
@@ -1473,7 +1699,7 @@ static int mpi3mr_bsg_request(struct bsg_job *job)
rval = mpi3mr_bsg_process_drv_cmds(job);
break;
case MPI3MR_MPT_CMD:
- rval = mpi3mr_bsg_process_mpt_cmds(job, &reply_payload_rcv_len);
+ rval = mpi3mr_bsg_process_mpt_cmds(job);
break;
default:
pr_err("%s: unsupported BSG command(0x%08x)\n",