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Commit 52c334e9 authored by Matthew Wilcox's avatar Matthew Wilcox Committed by James Bottomley
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[SCSI] advansys: convert to use the data buffer accessors 

- remove the unnecessary map_single path.
- convert to use the new accessors for the sg lists and the parameters.
Signed-off-by: default avatarFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>

- convert the statistics to not distinguish between single and sg xfers
- replace ASC_CEILING with DIV_ROUND_UP
- remove an obsolete comment
Signed-off-by: default avatarMatthew Wilcox <willy@linux.intel.com>
Signed-off-by: default avatarJames Bottomley <James.Bottomley@SteelEye.com>
parent fd625f47
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Showing with 52 additions and 184 deletions
drivers/scsi/advansys.c
View file @ 52c334e9
......@@ -2223,8 +2223,6 @@ do { \
(((struct asc_board *) shost_priv(shost))->asc_stats.counter += (count))
#endif /* ADVANSYS_STATS */
#define ASC_CEILING(val, unit) (((val) + ((unit) - 1))/(unit))
/* If the result wraps when calculating tenths, return 0. */
#define ASC_TENTHS(num, den) \
(((10 * ((num)/(den))) > (((num) * 10)/(den))) ? \
......@@ -2356,11 +2354,9 @@ struct asc_stats {
ADV_DCNT exe_error; /* # ASC_ERROR returns. */
ADV_DCNT exe_unknown; /* # unknown returns. */
/* Data Transfer Statistics */
ADV_DCNT cont_cnt; /* # non-scatter-gather I/O requests received */
ADV_DCNT cont_xfer; /* # contiguous transfer 512-bytes */
ADV_DCNT sg_cnt; /* # scatter-gather I/O requests received */
ADV_DCNT sg_elem; /* # scatter-gather elements */
ADV_DCNT sg_xfer; /* # scatter-gather transfer 512-bytes */
ADV_DCNT xfer_cnt; /* # I/O requests received */
ADV_DCNT xfer_elem; /* # scatter-gather elements */
ADV_DCNT xfer_sect; /* # 512-byte blocks */
};
#endif /* ADVANSYS_STATS */
......@@ -4057,57 +4053,32 @@ static int asc_prt_board_stats(struct Scsi_Host *shost, char *cp, int cplen)
/*
* Display data transfer statistics.
*/
if (s->cont_cnt > 0) {
len = asc_prt_line(cp, leftlen, " cont_cnt %lu, ", s->cont_cnt);
ASC_PRT_NEXT();
len = asc_prt_line(cp, leftlen, "cont_xfer %lu.%01lu kb ",
s->cont_xfer / 2,
ASC_TENTHS(s->cont_xfer, 2));
ASC_PRT_NEXT();
/* Contiguous transfer average size */
len = asc_prt_line(cp, leftlen, "avg_xfer %lu.%01lu kb\n",
(s->cont_xfer / 2) / s->cont_cnt,
ASC_TENTHS((s->cont_xfer / 2), s->cont_cnt));
if (s->xfer_cnt > 0) {
len = asc_prt_line(cp, leftlen, " xfer_cnt %lu, xfer_elem %lu, ",
s->xfer_cnt, s->xfer_elem);
ASC_PRT_NEXT();
}
if (s->sg_cnt > 0) {
len = asc_prt_line(cp, leftlen, " sg_cnt %lu, sg_elem %lu, ",
s->sg_cnt, s->sg_elem);
ASC_PRT_NEXT();
len = asc_prt_line(cp, leftlen, "sg_xfer %lu.%01lu kb\n",
s->sg_xfer / 2, ASC_TENTHS(s->sg_xfer, 2));
len = asc_prt_line(cp, leftlen, "xfer_bytes %lu.%01lu kb\n",
s->xfer_sect / 2, ASC_TENTHS(s->xfer_sect, 2));
ASC_PRT_NEXT();
/* Scatter gather transfer statistics */
len = asc_prt_line(cp, leftlen, " avg_num_elem %lu.%01lu, ",
s->sg_elem / s->sg_cnt,
ASC_TENTHS(s->sg_elem, s->sg_cnt));
s->xfer_elem / s->xfer_cnt,
ASC_TENTHS(s->xfer_elem, s->xfer_cnt));
ASC_PRT_NEXT();
len = asc_prt_line(cp, leftlen, "avg_elem_size %lu.%01lu kb, ",
(s->sg_xfer / 2) / s->sg_elem,
ASC_TENTHS((s->sg_xfer / 2), s->sg_elem));
(s->xfer_sect / 2) / s->xfer_elem,
ASC_TENTHS((s->xfer_sect / 2), s->xfer_elem));
ASC_PRT_NEXT();
len = asc_prt_line(cp, leftlen, "avg_xfer_size %lu.%01lu kb\n",
(s->sg_xfer / 2) / s->sg_cnt,
ASC_TENTHS((s->sg_xfer / 2), s->sg_cnt));
(s->xfer_sect / 2) / s->xfer_cnt,
ASC_TENTHS((s->xfer_sect / 2), s->xfer_cnt));
ASC_PRT_NEXT();
}
/*
* Display request queuing statistics.
*/
len = asc_prt_line(cp, leftlen,
" Active and Waiting Request Queues (Time Unit: %d HZ):\n",
HZ);
ASC_PRT_NEXT();
return totlen;
}
#endif /* ADVANSYS_STATS */
......@@ -4301,18 +4272,8 @@ advansys_proc_info(struct Scsi_Host *shost, char *buffer, char **start,
static void asc_scsi_done(struct scsi_cmnd *scp)
{
struct asc_board *boardp = shost_priv(scp->device->host);
if (scp->use_sg)
dma_unmap_sg(boardp->dev,
(struct scatterlist *)scp->request_buffer,
scp->use_sg, scp->sc_data_direction);
else if (scp->request_bufflen)
dma_unmap_single(boardp->dev, scp->SCp.dma_handle,
scp->request_bufflen, scp->sc_data_direction);
scsi_dma_unmap(scp);
ASC_STATS(scp->device->host, done);
scp->scsi_done(scp);
}
......@@ -8210,11 +8171,11 @@ static void adv_isr_callback(ADV_DVC_VAR *adv_dvc_varp, ADV_SCSI_REQ_Q *scsiqp)
* then return the number of underrun bytes.
*/
resid_cnt = le32_to_cpu(scsiqp->data_cnt);
if (scp->request_bufflen != 0 && resid_cnt != 0 &&
resid_cnt <= scp->request_bufflen) {
if (scsi_bufflen(scp) != 0 && resid_cnt != 0 &&
resid_cnt <= scsi_bufflen(scp)) {
ASC_DBG(1, "underrun condition %lu bytes\n",
(ulong)resid_cnt);
scp->resid = resid_cnt;
scsi_set_resid(scp, resid_cnt);
}
break;
......@@ -9148,11 +9109,11 @@ static void asc_isr_callback(ASC_DVC_VAR *asc_dvc_varp, ASC_QDONE_INFO *qdonep)
* If there was no error and an underrun condition, then
* return the number of underrun bytes.
*/
if (scp->request_bufflen != 0 && qdonep->remain_bytes != 0 &&
qdonep->remain_bytes <= scp->request_bufflen) {
if (scsi_bufflen(scp) != 0 && qdonep->remain_bytes != 0 &&
qdonep->remain_bytes <= scsi_bufflen(scp)) {
ASC_DBG(1, "underrun condition %u bytes\n",
(unsigned)qdonep->remain_bytes);
scp->resid = qdonep->remain_bytes;
scsi_set_resid(scp, qdonep->remain_bytes);
}
break;
......@@ -9877,6 +9838,8 @@ static int advansys_slave_configure(struct scsi_device *sdev)
static int asc_build_req(struct asc_board *boardp, struct scsi_cmnd *scp,
struct asc_scsi_q *asc_scsi_q)
{
int use_sg;
memset(asc_scsi_q, 0, sizeof(*asc_scsi_q));
/*
......@@ -9915,55 +9878,26 @@ static int asc_build_req(struct asc_board *boardp, struct scsi_cmnd *scp,
asc_scsi_q->q2.tag_code = MSG_SIMPLE_TAG;
}
/*
* Build ASC_SCSI_Q for a contiguous buffer or a scatter-gather
* buffer command.
*/
if (scp->use_sg == 0) {
/*
* CDB request of single contiguous buffer.
*/
ASC_STATS(scp->device->host, cont_cnt);
scp->SCp.dma_handle = scp->request_bufflen ?
dma_map_single(boardp->dev, scp->request_buffer,
scp->request_bufflen,
scp->sc_data_direction) : 0;
asc_scsi_q->q1.data_addr = cpu_to_le32(scp->SCp.dma_handle);
asc_scsi_q->q1.data_cnt = cpu_to_le32(scp->request_bufflen);
ASC_STATS_ADD(scp->device->host, cont_xfer,
ASC_CEILING(scp->request_bufflen, 512));
asc_scsi_q->q1.sg_queue_cnt = 0;
asc_scsi_q->sg_head = NULL;
} else {
/*
* CDB scatter-gather request list.
*/
/* Build ASC_SCSI_Q */
use_sg = scsi_dma_map(scp);
if (use_sg != 0) {
int sgcnt;
int use_sg;
struct scatterlist *slp;
struct asc_sg_head *asc_sg_head;
slp = (struct scatterlist *)scp->request_buffer;
use_sg = dma_map_sg(boardp->dev, slp, scp->use_sg,
scp->sc_data_direction);
if (use_sg > scp->device->host->sg_tablesize) {
scmd_printk(KERN_ERR, scp, "use_sg %d > "
"sg_tablesize %d\n", use_sg,
scp->device->host->sg_tablesize);
dma_unmap_sg(boardp->dev, slp, scp->use_sg,
scp->sc_data_direction);
scsi_dma_unmap(scp);
scp->result = HOST_BYTE(DID_ERROR);
return ASC_ERROR;
}
ASC_STATS(scp->device->host, sg_cnt);
asc_sg_head = kzalloc(sizeof(asc_scsi_q->sg_head) +
use_sg * sizeof(struct asc_sg_list), GFP_ATOMIC);
if (!asc_sg_head) {
dma_unmap_sg(boardp->dev, slp, scp->use_sg,
scp->sc_data_direction);
scsi_dma_unmap(scp);
scp->result = HOST_BYTE(DID_SOFT_ERROR);
return ASC_ERROR;
}
......@@ -9974,22 +9908,24 @@ static int asc_build_req(struct asc_board *boardp, struct scsi_cmnd *scp,
asc_scsi_q->q1.data_addr = 0;
/* This is a byte value, otherwise it would need to be swapped. */
asc_sg_head->entry_cnt = asc_scsi_q->q1.sg_queue_cnt = use_sg;
ASC_STATS_ADD(scp->device->host, sg_elem,
ASC_STATS_ADD(scp->device->host, xfer_elem,
asc_sg_head->entry_cnt);
/*
* Convert scatter-gather list into ASC_SG_HEAD list.
*/
for (sgcnt = 0; sgcnt < use_sg; sgcnt++, slp++) {
scsi_for_each_sg(scp, slp, use_sg, sgcnt) {
asc_sg_head->sg_list[sgcnt].addr =
cpu_to_le32(sg_dma_address(slp));
asc_sg_head->sg_list[sgcnt].bytes =
cpu_to_le32(sg_dma_len(slp));
ASC_STATS_ADD(scp->device->host, sg_xfer,
ASC_CEILING(sg_dma_len(slp), 512));
ASC_STATS_ADD(scp->device->host, xfer_sect,
DIV_ROUND_UP(sg_dma_len(slp), 512));
}
}
ASC_STATS(scp->device->host, xfer_cnt);
ASC_DBG_PRT_ASC_SCSI_Q(2, asc_scsi_q);
ASC_DBG_PRT_CDB(1, scp->cmnd, scp->cmd_len);
......@@ -10021,7 +9957,7 @@ adv_get_sglist(struct asc_board *boardp, adv_req_t *reqp, struct scsi_cmnd *scp,
int i;
scsiqp = (ADV_SCSI_REQ_Q *)ADV_32BALIGN(&reqp->scsi_req_q);
slp = (struct scatterlist *)scp->request_buffer;
slp = scsi_sglist(scp);
sg_elem_cnt = use_sg;
prev_sg_block = NULL;
reqp->sgblkp = NULL;
......@@ -10093,8 +10029,8 @@ adv_get_sglist(struct asc_board *boardp, adv_req_t *reqp, struct scsi_cmnd *scp,
cpu_to_le32(sg_dma_address(slp));
sg_block->sg_list[i].sg_count =
cpu_to_le32(sg_dma_len(slp));
ASC_STATS_ADD(scp->device->host, sg_xfer,
ASC_CEILING(sg_dma_len(slp), 512));
ASC_STATS_ADD(scp->device->host, xfer_sect,
DIV_ROUND_UP(sg_dma_len(slp), 512));
if (--sg_elem_cnt == 0) { /* Last ADV_SG_BLOCK and scatter-gather entry. */
sg_block->sg_cnt = i + 1;
......@@ -10126,6 +10062,7 @@ adv_build_req(struct asc_board *boardp, struct scsi_cmnd *scp,
ADV_SCSI_REQ_Q *scsiqp;
int i;
int ret;
int use_sg;
/*
* Allocate an adv_req_t structure from the board to execute
......@@ -10182,54 +10119,24 @@ adv_build_req(struct asc_board *boardp, struct scsi_cmnd *scp,
scsiqp->sense_addr = cpu_to_le32(virt_to_bus(&scp->sense_buffer[0]));
scsiqp->sense_len = sizeof(scp->sense_buffer);
/*
* Build ADV_SCSI_REQ_Q for a contiguous buffer or a scatter-gather
* buffer command.
*/
scsiqp->data_cnt = cpu_to_le32(scp->request_bufflen);
scsiqp->vdata_addr = scp->request_buffer;
scsiqp->data_addr = cpu_to_le32(virt_to_bus(scp->request_buffer));
/* Build ADV_SCSI_REQ_Q */
if (scp->use_sg == 0) {
/*
* CDB request of single contiguous buffer.
*/
use_sg = scsi_dma_map(scp);
if (use_sg == 0) {
/* Zero-length transfer */
reqp->sgblkp = NULL;
scsiqp->data_cnt = cpu_to_le32(scp->request_bufflen);
if (scp->request_bufflen) {
scsiqp->vdata_addr = scp->request_buffer;
scp->SCp.dma_handle =
dma_map_single(boardp->dev, scp->request_buffer,
scp->request_bufflen,
scp->sc_data_direction);
} else {
scsiqp->data_cnt = 0;
scsiqp->vdata_addr = NULL;
scp->SCp.dma_handle = 0;
}
scsiqp->data_addr = cpu_to_le32(scp->SCp.dma_handle);
scsiqp->data_addr = 0;
scsiqp->sg_list_ptr = NULL;
scsiqp->sg_real_addr = 0;
ASC_STATS(scp->device->host, cont_cnt);
ASC_STATS_ADD(scp->device->host, cont_xfer,
ASC_CEILING(scp->request_bufflen, 512));
} else {
/*
* CDB scatter-gather request list.
*/
struct scatterlist *slp;
int use_sg;
slp = (struct scatterlist *)scp->request_buffer;
use_sg = dma_map_sg(boardp->dev, slp, scp->use_sg,
scp->sc_data_direction);
if (use_sg > ADV_MAX_SG_LIST) {
scmd_printk(KERN_ERR, scp, "use_sg %d > "
"ADV_MAX_SG_LIST %d\n", use_sg,
scp->device->host->sg_tablesize);
dma_unmap_sg(boardp->dev, slp, scp->use_sg,
scp->sc_data_direction);
scsi_dma_unmap(scp);
scp->result = HOST_BYTE(DID_ERROR);
/*
......@@ -10242,6 +10149,8 @@ adv_build_req(struct asc_board *boardp, struct scsi_cmnd *scp,
return ASC_ERROR;
}
scsiqp->data_cnt = cpu_to_le32(scsi_bufflen(scp));
ret = adv_get_sglist(boardp, reqp, scp, use_sg);
if (ret != ADV_SUCCESS) {
/*
......@@ -10254,10 +10163,11 @@ adv_build_req(struct asc_board *boardp, struct scsi_cmnd *scp,
return ret;
}
ASC_STATS(scp->device->host, sg_cnt);
ASC_STATS_ADD(scp->device->host, sg_elem, use_sg);
ASC_STATS_ADD(scp->device->host, xfer_elem, use_sg);
}
ASC_STATS(scp->device->host, xfer_cnt);
ASC_DBG_PRT_ADV_SCSI_REQ_Q(2, scsiqp);
ASC_DBG_PRT_CDB(1, scp->cmnd, scp->cmd_len);
......@@ -10955,48 +10865,6 @@ static int AdvExeScsiQueue(ADV_DVC_VAR *asc_dvc, ADV_SCSI_REQ_Q *scsiq)
/*
* Execute a single 'Scsi_Cmnd'.
*
* The function 'done' is called when the request has been completed.
*
* Scsi_Cmnd:
*
* host - board controlling device
* device - device to send command
* target - target of device
* lun - lun of device
* cmd_len - length of SCSI CDB
* cmnd - buffer for SCSI 8, 10, or 12 byte CDB
* use_sg - if non-zero indicates scatter-gather request with use_sg elements
*
* if (use_sg == 0) {
* request_buffer - buffer address for request
* request_bufflen - length of request buffer
* } else {
* request_buffer - pointer to scatterlist structure
* }
*
* sense_buffer - sense command buffer
*
* result (4 bytes of an int):
* Byte Meaning
* 0 SCSI Status Byte Code
* 1 SCSI One Byte Message Code
* 2 Host Error Code
* 3 Mid-Level Error Code
*
* host driver fields:
* SCp - Scsi_Pointer used for command processing status
* scsi_done - used to save caller's done function
* host_scribble - used for pointer to another struct scsi_cmnd
*
* If this function returns ASC_NOERROR the request will be completed
* from the interrupt handler.
*
* If this function returns ASC_ERROR the host error code has been set,
* and the called must call asc_scsi_done.
*
* If ASC_BUSY is returned the request will be returned to the midlayer
* and re-tried later.
*/
static int asc_execute_scsi_cmnd(struct scsi_cmnd *scp)
{
......
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