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SCSI sg on 20190709

Browse Source 
This topic branch covers a fundamental change in how our sg lists are
 allocated to make mq more efficient by reducing the size of the
 preallocated sg list.  This necessitates a large number of driver
 changes because the previous guarantee that if a driver specified
 SG_ALL as the size of its scatter list, it would get a non-chained
 list and didn't need to bother with scatterlist iterators is now
 broken and every driver *must* use scatterlist iterators.
 
 This was broken out as a separate topic because we need to convert all
 the drivers before pulling the trigger and unconverted drivers kept
 being found, necessitating a rebase.
 
 Signed-off-by: James E.J. Bottomley <jejb@linux.ibm.com>
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Merge tag 'scsi-sg' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi

Pull SCSI scatter-gather list updates from James Bottomley:
 "This topic branch covers a fundamental change in how our sg lists are
  allocated to make mq more efficient by reducing the size of the
  preallocated sg list.

  This necessitates a large number of driver changes because the
  previous guarantee that if a driver specified SG_ALL as the size of
  its scatter list, it would get a non-chained list and didn't need to
  bother with scatterlist iterators is now broken and every driver
  *must* use scatterlist iterators.

  This was broken out as a separate topic because we need to convert all
  the drivers before pulling the trigger and unconverted drivers kept
  being found, necessitating a rebase"

* tag 'scsi-sg' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi: (21 commits)
  scsi: core: don't preallocate small SGL in case of NO_SG_CHAIN
  scsi: lib/sg_pool.c: clear 'first_chunk' in case of no preallocation
  scsi: core: avoid preallocating big SGL for data
  scsi: core: avoid preallocating big SGL for protection information
  scsi: lib/sg_pool.c: improve APIs for allocating sg pool
  scsi: esp: use sg helper to iterate over scatterlist
  scsi: NCR5380: use sg helper to iterate over scatterlist
  scsi: wd33c93: use sg helper to iterate over scatterlist
  scsi: ppa: use sg helper to iterate over scatterlist
  scsi: pcmcia: nsp_cs: use sg helper to iterate over scatterlist
  scsi: imm: use sg helper to iterate over scatterlist
  scsi: aha152x: use sg helper to iterate over scatterlist
  scsi: s390: zfcp_fc: use sg helper to iterate over scatterlist
  scsi: staging: unisys: visorhba: use sg helper to iterate over scatterlist
  scsi: usb: image: microtek: use sg helper to iterate over scatterlist
  scsi: pmcraid: use sg helper to iterate over scatterlist
  scsi: ipr: use sg helper to iterate over scatterlist
  scsi: mvumi: use sg helper to iterate over scatterlist
  scsi: lpfc: use sg helper to iterate over scatterlist
  scsi: advansys: use sg helper to iterate over scatterlist
  ...
This commit is contained in:
Linus Torvalds 2019-07-11 15:17:41 -07:00
commit 1f7563f743
26 changed files with 205 additions and 154 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/nvme/host/fc.c
View File

@ -2112,7 +2112,8 @@ nvme_fc_map_data(struct nvme_fc_ctrl *ctrl, struct request *rq,
freq->sg_table.sgl = freq->first_sgl;
ret = sg_alloc_table_chained(&freq->sg_table,
blk_rq_nr_phys_segments(rq), freq->sg_table.sgl);
blk_rq_nr_phys_segments(rq), freq->sg_table.sgl,
SG_CHUNK_SIZE);
if (ret)
return -ENOMEM;
@ -2122,7 +2123,7 @@ nvme_fc_map_data(struct nvme_fc_ctrl *ctrl, struct request *rq,
freq->sg_cnt = fc_dma_map_sg(ctrl->lport->dev, freq->sg_table.sgl,
op->nents, dir);
if (unlikely(freq->sg_cnt <= 0)) {
sg_free_table_chained(&freq->sg_table, true);
sg_free_table_chained(&freq->sg_table, SG_CHUNK_SIZE);
freq->sg_cnt = 0;
return -EFAULT;
}
@ -2148,7 +2149,7 @@ nvme_fc_unmap_data(struct nvme_fc_ctrl *ctrl, struct request *rq,
nvme_cleanup_cmd(rq);
sg_free_table_chained(&freq->sg_table, true);
sg_free_table_chained(&freq->sg_table, SG_CHUNK_SIZE);
freq->sg_cnt = 0;
}

7
drivers/nvme/host/rdma.c
View File

@ -1144,7 +1144,7 @@ static void nvme_rdma_unmap_data(struct nvme_rdma_queue *queue,
WRITE ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
nvme_cleanup_cmd(rq);
sg_free_table_chained(&req->sg_table, true);
sg_free_table_chained(&req->sg_table, SG_CHUNK_SIZE);
}
static int nvme_rdma_set_sg_null(struct nvme_command *c)
@ -1259,7 +1259,8 @@ static int nvme_rdma_map_data(struct nvme_rdma_queue *queue,
req->sg_table.sgl = req->first_sgl;
ret = sg_alloc_table_chained(&req->sg_table,
blk_rq_nr_phys_segments(rq), req->sg_table.sgl);
blk_rq_nr_phys_segments(rq), req->sg_table.sgl,
SG_CHUNK_SIZE);
if (ret)
return -ENOMEM;
@ -1299,7 +1300,7 @@ static int nvme_rdma_map_data(struct nvme_rdma_queue *queue,
req->nents, rq_data_dir(rq) ==
WRITE ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
out_free_table:
sg_free_table_chained(&req->sg_table, true);
sg_free_table_chained(&req->sg_table, SG_CHUNK_SIZE);
return ret;
}

4
drivers/nvme/target/loop.c
View File

@ -77,7 +77,7 @@ static void nvme_loop_complete_rq(struct request *req)
struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(req);
nvme_cleanup_cmd(req);
sg_free_table_chained(&iod->sg_table, true);
sg_free_table_chained(&iod->sg_table, SG_CHUNK_SIZE);
nvme_complete_rq(req);
}
@ -157,7 +157,7 @@ static blk_status_t nvme_loop_queue_rq(struct blk_mq_hw_ctx *hctx,
iod->sg_table.sgl = iod->first_sgl;
if (sg_alloc_table_chained(&iod->sg_table,
blk_rq_nr_phys_segments(req),
iod->sg_table.sgl))
iod->sg_table.sgl, SG_CHUNK_SIZE))
return BLK_STS_RESOURCE;
iod->req.sg = iod->sg_table.sgl;

4
drivers/s390/scsi/zfcp_fc.c
View File

@ -620,7 +620,7 @@ static void zfcp_fc_sg_free_table(struct scatterlist *sg, int count)
{
int i;
for (i = 0; i < count; i++, sg++)
for (i = 0; i < count; i++, sg = sg_next(sg))
if (sg)
free_page((unsigned long) sg_virt(sg));
else
@ -641,7 +641,7 @@ static int zfcp_fc_sg_setup_table(struct scatterlist *sg, int count)
int i;
sg_init_table(sg, count);
for (i = 0; i < count; i++, sg++) {
for (i = 0; i < count; i++, sg = sg_next(sg)) {
addr = (void *) get_zeroed_page(GFP_KERNEL);
if (!addr) {
zfcp_fc_sg_free_table(sg, i);

39
drivers/scsi/NCR5380.c
View File

@ -149,12 +149,10 @@ static inline void initialize_SCp(struct scsi_cmnd *cmd)
if (scsi_bufflen(cmd)) {
cmd->SCp.buffer = scsi_sglist(cmd);
cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1;
cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
cmd->SCp.this_residual = cmd->SCp.buffer->length;
} else {
cmd->SCp.buffer = NULL;
cmd->SCp.buffers_residual = 0;
cmd->SCp.ptr = NULL;
cmd->SCp.this_residual = 0;
}
@ -163,6 +161,17 @@ static inline void initialize_SCp(struct scsi_cmnd *cmd)
cmd->SCp.Message = 0;
}
static inline void advance_sg_buffer(struct scsi_cmnd *cmd)
{
struct scatterlist *s = cmd->SCp.buffer;
if (!cmd->SCp.this_residual && s && !sg_is_last(s)) {
cmd->SCp.buffer = sg_next(s);
cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
cmd->SCp.this_residual = cmd->SCp.buffer->length;
}
}
/**
* NCR5380_poll_politely2 - wait for two chip register values
* @hostdata: host private data
@ -1670,12 +1679,7 @@ static void NCR5380_information_transfer(struct Scsi_Host *instance)
sun3_dma_setup_done != cmd) {
int count;
if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
++cmd->SCp.buffer;
--cmd->SCp.buffers_residual;
cmd->SCp.this_residual = cmd->SCp.buffer->length;
cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
}
advance_sg_buffer(cmd);
count = sun3scsi_dma_xfer_len(hostdata, cmd);
@ -1725,15 +1729,11 @@ static void NCR5380_information_transfer(struct Scsi_Host *instance)
* scatter-gather list, move onto the next one.
*/
if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
++cmd->SCp.buffer;
--cmd->SCp.buffers_residual;
cmd->SCp.this_residual = cmd->SCp.buffer->length;
cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
dsprintk(NDEBUG_INFORMATION, instance, "%d bytes and %d buffers left\n",
advance_sg_buffer(cmd);
dsprintk(NDEBUG_INFORMATION, instance,
"this residual %d, sg ents %d\n",
cmd->SCp.this_residual,
cmd->SCp.buffers_residual);
}
sg_nents(cmd->SCp.buffer));
/*
* The preferred transfer method is going to be
@ -2126,12 +2126,7 @@ static void NCR5380_reselect(struct Scsi_Host *instance)
if (sun3_dma_setup_done != tmp) {
int count;
if (!tmp->SCp.this_residual && tmp->SCp.buffers_residual) {
++tmp->SCp.buffer;
--tmp->SCp.buffers_residual;
tmp->SCp.this_residual = tmp->SCp.buffer->length;
tmp->SCp.ptr = sg_virt(tmp->SCp.buffer);
}
advance_sg_buffer(tmp);
count = sun3scsi_dma_xfer_len(hostdata, tmp);

2
drivers/scsi/advansys.c
View File

@ -7710,7 +7710,7 @@ adv_get_sglist(struct asc_board *boardp, adv_req_t *reqp,
sg_block->sg_ptr = 0L; /* Last ADV_SG_BLOCK in list. */
return ADV_SUCCESS;
}
slp++;
slp = sg_next(slp);
}
sg_block->sg_cnt = NO_OF_SG_PER_BLOCK;
prev_sg_block = sg_block;

46
drivers/scsi/aha152x.c
View File

@ -937,7 +937,6 @@ static int aha152x_internal_queue(struct scsi_cmnd *SCpnt,
SCp.ptr : buffer pointer
SCp.this_residual : buffer length
SCp.buffer : next buffer
SCp.buffers_residual : left buffers in list
SCp.phase : current state of the command */
if ((phase & resetting) || !scsi_sglist(SCpnt)) {
@ -945,13 +944,11 @@ static int aha152x_internal_queue(struct scsi_cmnd *SCpnt,
SCpnt->SCp.this_residual = 0;
scsi_set_resid(SCpnt, 0);
SCpnt->SCp.buffer = NULL;
SCpnt->SCp.buffers_residual = 0;
} else {
scsi_set_resid(SCpnt, scsi_bufflen(SCpnt));
SCpnt->SCp.buffer = scsi_sglist(SCpnt);
SCpnt->SCp.ptr = SG_ADDRESS(SCpnt->SCp.buffer);
SCpnt->SCp.this_residual = SCpnt->SCp.buffer->length;
SCpnt->SCp.buffers_residual = scsi_sg_count(SCpnt) - 1;
}
DO_LOCK(flags);
@ -2019,10 +2016,9 @@ static void datai_run(struct Scsi_Host *shpnt)
}
if (CURRENT_SC->SCp.this_residual == 0 &&
CURRENT_SC->SCp.buffers_residual > 0) {
!sg_is_last(CURRENT_SC->SCp.buffer)) {
/* advance to next buffer */
CURRENT_SC->SCp.buffers_residual--;
CURRENT_SC->SCp.buffer++;
CURRENT_SC->SCp.buffer = sg_next(CURRENT_SC->SCp.buffer);
CURRENT_SC->SCp.ptr = SG_ADDRESS(CURRENT_SC->SCp.buffer);
CURRENT_SC->SCp.this_residual = CURRENT_SC->SCp.buffer->length;
}
@ -2125,10 +2121,10 @@ static void datao_run(struct Scsi_Host *shpnt)
CMD_INC_RESID(CURRENT_SC, -2 * data_count);
}
if(CURRENT_SC->SCp.this_residual==0 && CURRENT_SC->SCp.buffers_residual>0) {
if (CURRENT_SC->SCp.this_residual == 0 &&
!sg_is_last(CURRENT_SC->SCp.buffer)) {
/* advance to next buffer */
CURRENT_SC->SCp.buffers_residual--;
CURRENT_SC->SCp.buffer++;
CURRENT_SC->SCp.buffer = sg_next(CURRENT_SC->SCp.buffer);
CURRENT_SC->SCp.ptr = SG_ADDRESS(CURRENT_SC->SCp.buffer);
CURRENT_SC->SCp.this_residual = CURRENT_SC->SCp.buffer->length;
}
@ -2147,22 +2143,26 @@ static void datao_run(struct Scsi_Host *shpnt)
static void datao_end(struct Scsi_Host *shpnt)
{
if(TESTLO(DMASTAT, DFIFOEMP)) {
int data_count = (DATA_LEN - scsi_get_resid(CURRENT_SC)) -
GETSTCNT();
u32 datao_cnt = GETSTCNT();
int datao_out = DATA_LEN - scsi_get_resid(CURRENT_SC);
int done;
struct scatterlist *sg = scsi_sglist(CURRENT_SC);
CMD_INC_RESID(CURRENT_SC, data_count);
CMD_INC_RESID(CURRENT_SC, datao_out - datao_cnt);
data_count -= CURRENT_SC->SCp.ptr -
SG_ADDRESS(CURRENT_SC->SCp.buffer);
while(data_count>0) {
CURRENT_SC->SCp.buffer--;
CURRENT_SC->SCp.buffers_residual++;
data_count -= CURRENT_SC->SCp.buffer->length;
done = scsi_bufflen(CURRENT_SC) - scsi_get_resid(CURRENT_SC);
/* Locate the first SG entry not yet sent */
while (done > 0 && !sg_is_last(sg)) {
if (done < sg->length)
break;
done -= sg->length;
sg = sg_next(sg);
}
CURRENT_SC->SCp.ptr = SG_ADDRESS(CURRENT_SC->SCp.buffer) -
data_count;
CURRENT_SC->SCp.this_residual = CURRENT_SC->SCp.buffer->length +
data_count;
CURRENT_SC->SCp.buffer = sg;
CURRENT_SC->SCp.ptr = SG_ADDRESS(CURRENT_SC->SCp.buffer) + done;
CURRENT_SC->SCp.this_residual = CURRENT_SC->SCp.buffer->length -
done;
}
SETPORT(SXFRCTL0, CH1|CLRCH1|CLRSTCNT);
@ -2490,7 +2490,7 @@ static void get_command(struct seq_file *m, struct scsi_cmnd * ptr)
seq_printf(m, "); resid=%d; residual=%d; buffers=%d; phase |",
scsi_get_resid(ptr), ptr->SCp.this_residual,
ptr->SCp.buffers_residual);
sg_nents(ptr->SCp.buffer) - 1);
if (ptr->SCp.phase & not_issued)
seq_puts(m, "not issued|");

20
drivers/scsi/esp_scsi.c
View File

@ -371,6 +371,7 @@ static void esp_map_dma(struct esp *esp, struct scsi_cmnd *cmd)
struct esp_cmd_priv *spriv = ESP_CMD_PRIV(cmd);
struct scatterlist *sg = scsi_sglist(cmd);
int total = 0, i;
struct scatterlist *s;
if (cmd->sc_data_direction == DMA_NONE)
return;
@ -381,16 +382,18 @@ static void esp_map_dma(struct esp *esp, struct scsi_cmnd *cmd)
* a dma address, so perform an identity mapping.
*/
spriv->num_sg = scsi_sg_count(cmd);
for (i = 0; i < spriv->num_sg; i++) {
sg[i].dma_address = (uintptr_t)sg_virt(&sg[i]);
total += sg_dma_len(&sg[i]);
scsi_for_each_sg(cmd, s, spriv->num_sg, i) {
s->dma_address = (uintptr_t)sg_virt(s);
total += sg_dma_len(s);
}
} else {
spriv->num_sg = scsi_dma_map(cmd);
for (i = 0; i < spriv->num_sg; i++)
total += sg_dma_len(&sg[i]);
scsi_for_each_sg(cmd, s, spriv->num_sg, i)
total += sg_dma_len(s);
}
spriv->cur_residue = sg_dma_len(sg);
spriv->prv_sg = NULL;
spriv->cur_sg = sg;
spriv->tot_residue = total;
}
@ -444,7 +447,8 @@ static void esp_advance_dma(struct esp *esp, struct esp_cmd_entry *ent,
p->tot_residue = 0;
}
if (!p->cur_residue && p->tot_residue) {
p->cur_sg++;
p->prv_sg = p->cur_sg;
p->cur_sg = sg_next(p->cur_sg);
p->cur_residue = sg_dma_len(p->cur_sg);
}
}
@ -465,6 +469,7 @@ static void esp_save_pointers(struct esp *esp, struct esp_cmd_entry *ent)
return;
}
ent->saved_cur_residue = spriv->cur_residue;
ent->saved_prv_sg = spriv->prv_sg;
ent->saved_cur_sg = spriv->cur_sg;
ent->saved_tot_residue = spriv->tot_residue;
}
@ -479,6 +484,7 @@ static void esp_restore_pointers(struct esp *esp, struct esp_cmd_entry *ent)
return;
}
spriv->cur_residue = ent->saved_cur_residue;
spriv->prv_sg = ent->saved_prv_sg;
spriv->cur_sg = ent->saved_cur_sg;
spriv->tot_residue = ent->saved_tot_residue;
}
@ -1647,7 +1653,7 @@ static int esp_msgin_process(struct esp *esp)
spriv = ESP_CMD_PRIV(ent->cmd);
if (spriv->cur_residue == sg_dma_len(spriv->cur_sg)) {
spriv->cur_sg--;
spriv->cur_sg = spriv->prv_sg;
spriv->cur_residue = 1;
} else
spriv->cur_residue++;

2
drivers/scsi/esp_scsi.h
View File

@ -251,6 +251,7 @@
struct esp_cmd_priv {
int num_sg;
int cur_residue;
struct scatterlist *prv_sg;
struct scatterlist *cur_sg;
int tot_residue;
};
@ -273,6 +274,7 @@ struct esp_cmd_entry {
struct scsi_cmnd *cmd;
unsigned int saved_cur_residue;
struct scatterlist *saved_prv_sg;
struct scatterlist *saved_cur_sg;
unsigned int saved_tot_residue;

2
drivers/scsi/imm.c
View File

@ -687,7 +687,7 @@ static int imm_completion(struct scsi_cmnd *cmd)
if (cmd->SCp.buffer && !cmd->SCp.this_residual) {
/* if scatter/gather, advance to the next segment */
if (cmd->SCp.buffers_residual--) {
cmd->SCp.buffer++;
cmd->SCp.buffer = sg_next(cmd->SCp.buffer);
cmd->SCp.this_residual =
cmd->SCp.buffer->length;
cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);

29
drivers/scsi/ipr.c
View File

@ -3901,22 +3901,23 @@ static int ipr_copy_ucode_buffer(struct ipr_sglist *sglist,
u8 *buffer, u32 len)
{
int bsize_elem, i, result = 0;
struct scatterlist *scatterlist;
struct scatterlist *sg;
void *kaddr;
/* Determine the actual number of bytes per element */
bsize_elem = PAGE_SIZE * (1 << sglist->order);
scatterlist = sglist->scatterlist;
sg = sglist->scatterlist;
for (i = 0; i < (len / bsize_elem); i++, buffer += bsize_elem) {
struct page *page = sg_page(&scatterlist[i]);
for (i = 0; i < (len / bsize_elem); i++, sg = sg_next(sg),
buffer += bsize_elem) {
struct page *page = sg_page(sg);
kaddr = kmap(page);
memcpy(kaddr, buffer, bsize_elem);
kunmap(page);
scatterlist[i].length = bsize_elem;
sg->length = bsize_elem;
if (result != 0) {
ipr_trace;
@ -3925,13 +3926,13 @@ static int ipr_copy_ucode_buffer(struct ipr_sglist *sglist,
}
if (len % bsize_elem) {
struct page *page = sg_page(&scatterlist[i]);
struct page *page = sg_page(sg);
kaddr = kmap(page);
memcpy(kaddr, buffer, len % bsize_elem);
kunmap(page);
scatterlist[i].length = len % bsize_elem;
sg->length = len % bsize_elem;
}
sglist->buffer_len = len;
@ -3952,6 +3953,7 @@ static void ipr_build_ucode_ioadl64(struct ipr_cmnd *ipr_cmd,
struct ipr_ioarcb *ioarcb = &ipr_cmd->ioarcb;
struct ipr_ioadl64_desc *ioadl64 = ipr_cmd->i.ioadl64;
struct scatterlist *scatterlist = sglist->scatterlist;
struct scatterlist *sg;
int i;
ipr_cmd->dma_use_sg = sglist->num_dma_sg;
@ -3960,10 +3962,10 @@ static void ipr_build_ucode_ioadl64(struct ipr_cmnd *ipr_cmd,
ioarcb->ioadl_len =
cpu_to_be32(sizeof(struct ipr_ioadl64_desc) * ipr_cmd->dma_use_sg);
for (i = 0; i < ipr_cmd->dma_use_sg; i++) {
for_each_sg(scatterlist, sg, ipr_cmd->dma_use_sg, i) {
ioadl64[i].flags = cpu_to_be32(IPR_IOADL_FLAGS_WRITE);
ioadl64[i].data_len = cpu_to_be32(sg_dma_len(&scatterlist[i]));
ioadl64[i].address = cpu_to_be64(sg_dma_address(&scatterlist[i]));
ioadl64[i].data_len = cpu_to_be32(sg_dma_len(sg));
ioadl64[i].address = cpu_to_be64(sg_dma_address(sg));
}
ioadl64[i-1].flags |= cpu_to_be32(IPR_IOADL_FLAGS_LAST);
@ -3983,6 +3985,7 @@ static void ipr_build_ucode_ioadl(struct ipr_cmnd *ipr_cmd,
struct ipr_ioarcb *ioarcb = &ipr_cmd->ioarcb;
struct ipr_ioadl_desc *ioadl = ipr_cmd->i.ioadl;
struct scatterlist *scatterlist = sglist->scatterlist;
struct scatterlist *sg;
int i;
ipr_cmd->dma_use_sg = sglist->num_dma_sg;
@ -3992,11 +3995,11 @@ static void ipr_build_ucode_ioadl(struct ipr_cmnd *ipr_cmd,
ioarcb->ioadl_len =
cpu_to_be32(sizeof(struct ipr_ioadl_desc) * ipr_cmd->dma_use_sg);
for (i = 0; i < ipr_cmd->dma_use_sg; i++) {
for_each_sg(scatterlist, sg, ipr_cmd->dma_use_sg, i) {
ioadl[i].flags_and_data_len =
cpu_to_be32(IPR_IOADL_FLAGS_WRITE | sg_dma_len(&scatterlist[i]));
cpu_to_be32(IPR_IOADL_FLAGS_WRITE | sg_dma_len(sg));
ioadl[i].address =
cpu_to_be32(sg_dma_address(&scatterlist[i]));
cpu_to_be32(sg_dma_address(sg));
}
ioadl[i-1].flags_and_data_len |=

3
drivers/scsi/lpfc/lpfc_nvmet.c
View File

@ -2904,8 +2904,7 @@ lpfc_nvmet_prep_fcp_wqe(struct lpfc_hba *phba,
nvmewqe->drvrTimeout = (phba->fc_ratov * 3) + LPFC_DRVR_TIMEOUT;
nvmewqe->context1 = ndlp;
for (i = 0; i < rsp->sg_cnt; i++) {
sgel = &rsp->sg[i];
for_each_sg(rsp->sg, sgel, rsp->sg_cnt, i) {
physaddr = sg_dma_address(sgel);
cnt = sg_dma_len(sgel);
sgl->addr_hi = putPaddrHigh(physaddr);

11
drivers/scsi/mvumi.c
View File

@ -195,23 +195,22 @@ static int mvumi_make_sgl(struct mvumi_hba *mhba, struct scsi_cmnd *scmd,
unsigned int sgnum = scsi_sg_count(scmd);
dma_addr_t busaddr;
sg = scsi_sglist(scmd);
*sg_count = dma_map_sg(&mhba->pdev->dev, sg, sgnum,
*sg_count = dma_map_sg(&mhba->pdev->dev, scsi_sglist(scmd), sgnum,
scmd->sc_data_direction);
if (*sg_count > mhba->max_sge) {
dev_err(&mhba->pdev->dev,
"sg count[0x%x] is bigger than max sg[0x%x].\n",
*sg_count, mhba->max_sge);
dma_unmap_sg(&mhba->pdev->dev, sg, sgnum,
dma_unmap_sg(&mhba->pdev->dev, scsi_sglist(scmd), sgnum,
scmd->sc_data_direction);
return -1;
}
for (i = 0; i < *sg_count; i++) {
busaddr = sg_dma_address(&sg[i]);
scsi_for_each_sg(scmd, sg, *sg_count, i) {
busaddr = sg_dma_address(sg);
m_sg->baseaddr_l = cpu_to_le32(lower_32_bits(busaddr));
m_sg->baseaddr_h = cpu_to_le32(upper_32_bits(busaddr));
m_sg->flags = 0;
sgd_setsz(mhba, m_sg, cpu_to_le32(sg_dma_len(&sg[i])));
sgd_setsz(mhba, m_sg, cpu_to_le32(sg_dma_len(sg)));
if ((i + 1) == *sg_count)
m_sg->flags |= 1U << mhba->eot_flag;

4
drivers/scsi/pcmcia/nsp_cs.c
View File

@ -789,7 +789,7 @@ static void nsp_pio_read(struct scsi_cmnd *SCpnt)
SCpnt->SCp.buffers_residual != 0 ) {
//nsp_dbg(NSP_DEBUG_DATA_IO, "scatterlist next timeout=%d", time_out);
SCpnt->SCp.buffers_residual--;
SCpnt->SCp.buffer++;
SCpnt->SCp.buffer = sg_next(SCpnt->SCp.buffer);
SCpnt->SCp.ptr = BUFFER_ADDR;
SCpnt->SCp.this_residual = SCpnt->SCp.buffer->length;
time_out = 1000;
@ -887,7 +887,7 @@ static void nsp_pio_write(struct scsi_cmnd *SCpnt)
SCpnt->SCp.buffers_residual != 0 ) {
//nsp_dbg(NSP_DEBUG_DATA_IO, "scatterlist next");
SCpnt->SCp.buffers_residual--;
SCpnt->SCp.buffer++;
SCpnt->SCp.buffer = sg_next(SCpnt->SCp.buffer);
SCpnt->SCp.ptr = BUFFER_ADDR;
SCpnt->SCp.this_residual = SCpnt->SCp.buffer->length;
time_out = 1000;

14
drivers/scsi/pmcraid.c
View File

@ -3255,7 +3255,7 @@ static int pmcraid_copy_sglist(
int direction
)
{
struct scatterlist *scatterlist;
struct scatterlist *sg;
void *kaddr;
int bsize_elem;
int i;
@ -3264,10 +3264,10 @@ static int pmcraid_copy_sglist(
/* Determine the actual number of bytes per element */
bsize_elem = PAGE_SIZE * (1 << sglist->order);
scatterlist = sglist->scatterlist;
sg = sglist->scatterlist;
for (i = 0; i < (len / bsize_elem); i++, buffer += bsize_elem) {
struct page *page = sg_page(&scatterlist[i]);
for (i = 0; i < (len / bsize_elem); i++, sg = sg_next(sg), buffer += bsize_elem) {
struct page *page = sg_page(sg);
kaddr = kmap(page);
if (direction == DMA_TO_DEVICE)
@ -3282,11 +3282,11 @@ static int pmcraid_copy_sglist(
return -EFAULT;
}
scatterlist[i].length = bsize_elem;
sg->length = bsize_elem;
}
if (len % bsize_elem) {
struct page *page = sg_page(&scatterlist[i]);
struct page *page = sg_page(sg);
kaddr = kmap(page);
@ -3297,7 +3297,7 @@ static int pmcraid_copy_sglist(
kunmap(page);
scatterlist[i].length = len % bsize_elem;
sg->length = len % bsize_elem;
}
if (rc) {

2
drivers/scsi/ppa.c
View File

@ -590,7 +590,7 @@ static int ppa_completion(struct scsi_cmnd *cmd)
if (cmd->SCp.buffer && !cmd->SCp.this_residual) {
/* if scatter/gather, advance to the next segment */
if (cmd->SCp.buffers_residual--) {
cmd->SCp.buffer++;
cmd->SCp.buffer = sg_next(cmd->SCp.buffer);
cmd->SCp.this_residual =
cmd->SCp.buffer->length;
cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);

35
drivers/scsi/scsi_lib.c
View File

@ -40,6 +40,18 @@
#include "scsi_priv.h"
#include "scsi_logging.h"
/*
* Size of integrity metadata is usually small, 1 inline sg should
* cover normal cases.
*/
#ifdef CONFIG_ARCH_NO_SG_CHAIN
#define SCSI_INLINE_PROT_SG_CNT 0
#define SCSI_INLINE_SG_CNT 0
#else
#define SCSI_INLINE_PROT_SG_CNT 1
#define SCSI_INLINE_SG_CNT 2
#endif
static struct kmem_cache *scsi_sdb_cache;
static struct kmem_cache *scsi_sense_cache;
static struct kmem_cache *scsi_sense_isadma_cache;
@ -542,9 +554,11 @@ static void scsi_uninit_cmd(struct scsi_cmnd *cmd)
static void scsi_mq_free_sgtables(struct scsi_cmnd *cmd)
{
if (cmd->sdb.table.nents)
sg_free_table_chained(&cmd->sdb.table, true);
sg_free_table_chained(&cmd->sdb.table,
SCSI_INLINE_SG_CNT);
if (scsi_prot_sg_count(cmd))
sg_free_table_chained(&cmd->prot_sdb->table, true);
sg_free_table_chained(&cmd->prot_sdb->table,
SCSI_INLINE_PROT_SG_CNT);
}
static void scsi_mq_uninit_cmd(struct scsi_cmnd *cmd)
@ -977,7 +991,8 @@ static blk_status_t scsi_init_sgtable(struct request *req,
* If sg table allocation fails, requeue request later.
*/
if (unlikely(sg_alloc_table_chained(&sdb->table,
blk_rq_nr_phys_segments(req), sdb->table.sgl)))
blk_rq_nr_phys_segments(req), sdb->table.sgl,
SCSI_INLINE_SG_CNT)))
return BLK_STS_RESOURCE;
/*
@ -1031,7 +1046,8 @@ blk_status_t scsi_init_io(struct scsi_cmnd *cmd)
ivecs = blk_rq_count_integrity_sg(rq->q, rq->bio);
if (sg_alloc_table_chained(&prot_sdb->table, ivecs,
prot_sdb->table.sgl)) {
prot_sdb->table.sgl,
SCSI_INLINE_PROT_SG_CNT)) {
ret = BLK_STS_RESOURCE;
goto out_free_sgtables;
}
@ -1542,9 +1558,9 @@ static int scsi_dispatch_cmd(struct scsi_cmnd *cmd)
}
/* Size in bytes of the sg-list stored in the scsi-mq command-private data. */
static unsigned int scsi_mq_sgl_size(struct Scsi_Host *shost)
static unsigned int scsi_mq_inline_sgl_size(struct Scsi_Host *shost)
{
return min_t(unsigned int, shost->sg_tablesize, SG_CHUNK_SIZE) *
return min_t(unsigned int, shost->sg_tablesize, SCSI_INLINE_SG_CNT) *
sizeof(struct scatterlist);
}
@ -1726,7 +1742,7 @@ static int scsi_mq_init_request(struct blk_mq_tag_set *set, struct request *rq,
if (scsi_host_get_prot(shost)) {
sg = (void *)cmd + sizeof(struct scsi_cmnd) +
shost->hostt->cmd_size;
cmd->prot_sdb = (void *)sg + scsi_mq_sgl_size(shost);
cmd->prot_sdb = (void *)sg + scsi_mq_inline_sgl_size(shost);
}
return 0;
@ -1820,10 +1836,11 @@ int scsi_mq_setup_tags(struct Scsi_Host *shost)
{
unsigned int cmd_size, sgl_size;
sgl_size = scsi_mq_sgl_size(shost);
sgl_size = scsi_mq_inline_sgl_size(shost);
cmd_size = sizeof(struct scsi_cmnd) + shost->hostt->cmd_size + sgl_size;
if (scsi_host_get_prot(shost))
cmd_size += sizeof(struct scsi_data_buffer) + sgl_size;
cmd_size += sizeof(struct scsi_data_buffer) +
sizeof(struct scatterlist) * SCSI_INLINE_PROT_SG_CNT;
memset(&shost->tag_set, 0, sizeof(shost->tag_set));
shost->tag_set.ops = &scsi_mq_ops;

2
drivers/scsi/vmw_pvscsi.c
View File

@ -335,7 +335,7 @@ static void pvscsi_create_sg(struct pvscsi_ctx *ctx,
BUG_ON(count > PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT);
sge = &ctx->sgl->sge[0];
for (i = 0; i < count; i++, sg++) {
for (i = 0; i < count; i++, sg = sg_next(sg)) {
sge[i].addr = sg_dma_address(sg);
sge[i].length = sg_dma_len(sg);
sge[i].flags = 0;

2
drivers/scsi/wd33c93.c
View File

@ -735,7 +735,7 @@ transfer_bytes(const wd33c93_regs regs, struct scsi_cmnd *cmd,
* source or destination for THIS transfer.
*/
if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
++cmd->SCp.buffer;
cmd->SCp.buffer = sg_next(cmd->SCp.buffer);
--cmd->SCp.buffers_residual;
cmd->SCp.this_residual = cmd->SCp.buffer->length;
cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);

9
drivers/staging/unisys/visorhba/visorhba_main.c
View File

@ -871,12 +871,11 @@ static void do_scsi_nolinuxstat(struct uiscmdrsp *cmdrsp,
return;
}
sg = scsi_sglist(scsicmd);
for (i = 0; i < scsi_sg_count(scsicmd); i++) {
this_page_orig = kmap_atomic(sg_page(sg + i));
scsi_for_each_sg(scsicmd, sg, scsi_sg_count(scsicmd), i) {
this_page_orig = kmap_atomic(sg_page(sg));
this_page = (void *)((unsigned long)this_page_orig |
sg[i].offset);
memcpy(this_page, buf + bufind, sg[i].length);
sg->offset);
memcpy(this_page, buf + bufind, sg->length);
kunmap_atomic(this_page_orig);
}
kfree(buf);

18
drivers/usb/image/microtek.c
View File

@ -488,7 +488,6 @@ static void mts_command_done( struct urb *transfer )
static void mts_do_sg (struct urb* transfer)
{
struct scatterlist * sg;
int status = transfer->status;
MTS_INT_INIT();
@ -500,13 +499,12 @@ static void mts_do_sg (struct urb* transfer)
mts_transfer_cleanup(transfer);
}
sg = scsi_sglist(context->srb);
context->fragment++;
context->curr_sg = sg_next(context->curr_sg);
mts_int_submit_urb(transfer,
context->data_pipe,
sg_virt(&sg[context->fragment]),
sg[context->fragment].length,
context->fragment + 1 == scsi_sg_count(context->srb) ?
sg_virt(context->curr_sg),
context->curr_sg->length,
sg_is_last(context->curr_sg) ?
mts_data_done : mts_do_sg);
}
@ -526,22 +524,20 @@ static void
mts_build_transfer_context(struct scsi_cmnd *srb, struct mts_desc* desc)
{
int pipe;
struct scatterlist * sg;
MTS_DEBUG_GOT_HERE();
desc->context.instance = desc;
desc->context.srb = srb;
desc->context.fragment = 0;
if (!scsi_bufflen(srb)) {
desc->context.data = NULL;
desc->context.data_length = 0;
return;
} else {
sg = scsi_sglist(srb);
desc->context.data = sg_virt(&sg[0]);
desc->context.data_length = sg[0].length;
desc->context.curr_sg = scsi_sglist(srb);
desc->context.data = sg_virt(desc->context.curr_sg);
desc->context.data_length = desc->context.curr_sg->length;
}

2
drivers/usb/image/microtek.h
View File

@ -21,7 +21,7 @@ struct mts_transfer_context
void *data;
unsigned data_length;
int data_pipe;
int fragment;
struct scatterlist *curr_sg;
u8 *scsi_status; /* status returned from ep_response after command completion */
};

11
include/linux/scatterlist.h
View File

@ -266,10 +266,11 @@ int sg_split(struct scatterlist *in, const int in_mapped_nents,
typedef struct scatterlist *(sg_alloc_fn)(unsigned int, gfp_t);
typedef void (sg_free_fn)(struct scatterlist *, unsigned int);
void __sg_free_table(struct sg_table *, unsigned int, bool, sg_free_fn *);
void __sg_free_table(struct sg_table *, unsigned int, unsigned int,
sg_free_fn *);
void sg_free_table(struct sg_table *);
int __sg_alloc_table(struct sg_table *, unsigned int, unsigned int,
struct scatterlist *, gfp_t, sg_alloc_fn *);
struct scatterlist *, unsigned int, gfp_t, sg_alloc_fn *);
int sg_alloc_table(struct sg_table *, unsigned int, gfp_t);
int __sg_alloc_table_from_pages(struct sg_table *sgt, struct page **pages,
unsigned int n_pages, unsigned int offset,
@ -331,9 +332,11 @@ size_t sg_zero_buffer(struct scatterlist *sgl, unsigned int nents,
#endif
#ifdef CONFIG_SG_POOL
void sg_free_table_chained(struct sg_table *table, bool first_chunk);
void sg_free_table_chained(struct sg_table *table,
unsigned nents_first_chunk);
int sg_alloc_table_chained(struct sg_table *table, int nents,
struct scatterlist *first_chunk);
struct scatterlist *first_chunk,
unsigned nents_first_chunk);
#endif
/*

36
lib/scatterlist.c
View File

@ -179,7 +179,8 @@ static void sg_kfree(struct scatterlist *sg, unsigned int nents)
* __sg_free_table - Free a previously mapped sg table
* @table: The sg table header to use
* @max_ents: The maximum number of entries per single scatterlist
* @skip_first_chunk: don't free the (preallocated) first scatterlist chunk
* @nents_first_chunk: Number of entries int the (preallocated) first
* scatterlist chunk, 0 means no such preallocated first chunk
* @free_fn: Free function
*
* Description:
@ -189,9 +190,10 @@ static void sg_kfree(struct scatterlist *sg, unsigned int nents)
*
**/
void __sg_free_table(struct sg_table *table, unsigned int max_ents,
bool skip_first_chunk, sg_free_fn *free_fn)
unsigned int nents_first_chunk, sg_free_fn *free_fn)
{
struct scatterlist *sgl, *next;
unsigned curr_max_ents = nents_first_chunk ?: max_ents;
if (unlikely(!table->sgl))
return;
@ -207,9 +209,9 @@ void __sg_free_table(struct sg_table *table, unsigned int max_ents,
* sg_size is then one less than alloc size, since the last
* element is the chain pointer.
*/
if (alloc_size > max_ents) {
next = sg_chain_ptr(&sgl[max_ents - 1]);
alloc_size = max_ents;
if (alloc_size > curr_max_ents) {
next = sg_chain_ptr(&sgl[curr_max_ents - 1]);
alloc_size = curr_max_ents;
sg_size = alloc_size - 1;
} else {
sg_size = alloc_size;
@ -217,11 +219,12 @@ void __sg_free_table(struct sg_table *table, unsigned int max_ents,
}
table->orig_nents -= sg_size;
if (skip_first_chunk)
skip_first_chunk = false;
if (nents_first_chunk)
nents_first_chunk = 0;
else
free_fn(sgl, alloc_size);
sgl = next;
curr_max_ents = max_ents;
}
table->sgl = NULL;
@ -244,6 +247,8 @@ EXPORT_SYMBOL(sg_free_table);
* @table: The sg table header to use
* @nents: Number of entries in sg list
* @max_ents: The maximum number of entries the allocator returns per call
* @nents_first_chunk: Number of entries int the (preallocated) first
* scatterlist chunk, 0 means no such preallocated chunk provided by user
* @gfp_mask: GFP allocation mask
* @alloc_fn: Allocator to use
*
@ -260,10 +265,13 @@ EXPORT_SYMBOL(sg_free_table);
**/
int __sg_alloc_table(struct sg_table *table, unsigned int nents,
unsigned int max_ents, struct scatterlist *first_chunk,
gfp_t gfp_mask, sg_alloc_fn *alloc_fn)
unsigned int nents_first_chunk, gfp_t gfp_mask,
sg_alloc_fn *alloc_fn)
{
struct scatterlist *sg, *prv;
unsigned int left;
unsigned curr_max_ents = nents_first_chunk ?: max_ents;
unsigned prv_max_ents;
memset(table, 0, sizeof(*table));
@ -279,8 +287,8 @@ int __sg_alloc_table(struct sg_table *table, unsigned int nents,
do {
unsigned int sg_size, alloc_size = left;
if (alloc_size > max_ents) {
alloc_size = max_ents;
if (alloc_size > curr_max_ents) {
alloc_size = curr_max_ents;
sg_size = alloc_size - 1;
} else
sg_size = alloc_size;
@ -314,7 +322,7 @@ int __sg_alloc_table(struct sg_table *table, unsigned int nents,
* If this is not the first mapping, chain previous part.
*/
if (prv)
sg_chain(prv, max_ents, sg);
sg_chain(prv, prv_max_ents, sg);
else
table->sgl = sg;
@ -325,6 +333,8 @@ int __sg_alloc_table(struct sg_table *table, unsigned int nents,
sg_mark_end(&sg[sg_size - 1]);
prv = sg;
prv_max_ents = curr_max_ents;
curr_max_ents = max_ents;
} while (left);
return 0;
@ -347,9 +357,9 @@ int sg_alloc_table(struct sg_table *table, unsigned int nents, gfp_t gfp_mask)
int ret;
ret = __sg_alloc_table(table, nents, SG_MAX_SINGLE_ALLOC,
NULL, gfp_mask, sg_kmalloc);
NULL, 0, gfp_mask, sg_kmalloc);
if (unlikely(ret))
__sg_free_table(table, SG_MAX_SINGLE_ALLOC, false, sg_kfree);
__sg_free_table(table, SG_MAX_SINGLE_ALLOC, 0, sg_kfree);
return ret;
}

39
lib/sg_pool.c
View File

@ -70,18 +70,27 @@ static struct scatterlist *sg_pool_alloc(unsigned int nents, gfp_t gfp_mask)
/**
* sg_free_table_chained - Free a previously mapped sg table
* @table: The sg table header to use
* @first_chunk: was first_chunk not NULL in sg_alloc_table_chained?
* @nents_first_chunk: size of the first_chunk SGL passed to
* sg_alloc_table_chained
*
* Description:
* Free an sg table previously allocated and setup with
* sg_alloc_table_chained().
*
* @nents_first_chunk has to be same with that same parameter passed
* to sg_alloc_table_chained().
*
**/
void sg_free_table_chained(struct sg_table *table, bool first_chunk)
void sg_free_table_chained(struct sg_table *table,
unsigned nents_first_chunk)
{
if (first_chunk && table->orig_nents <= SG_CHUNK_SIZE)
if (table->orig_nents <= nents_first_chunk)
return;
__sg_free_table(table, SG_CHUNK_SIZE, first_chunk, sg_pool_free);
if (nents_first_chunk == 1)
nents_first_chunk = 0;
__sg_free_table(table, SG_CHUNK_SIZE, nents_first_chunk, sg_pool_free);
}
EXPORT_SYMBOL_GPL(sg_free_table_chained);
@ -90,31 +99,41 @@ EXPORT_SYMBOL_GPL(sg_free_table_chained);
* @table: The sg table header to use
* @nents: Number of entries in sg list
* @first_chunk: first SGL
* @nents_first_chunk: number of the SGL of @first_chunk
*
* Description:
* Allocate and chain SGLs in an sg table. If @nents@ is larger than
* SG_CHUNK_SIZE a chained sg table will be setup.
* @nents_first_chunk a chained sg table will be setup. @first_chunk is
* ignored if nents_first_chunk <= 1 because user expects the SGL points
* non-chain SGL.
*
**/
int sg_alloc_table_chained(struct sg_table *table, int nents,
struct scatterlist *first_chunk)
struct scatterlist *first_chunk, unsigned nents_first_chunk)
{
int ret;
BUG_ON(!nents);
if (first_chunk) {
if (nents <= SG_CHUNK_SIZE) {
if (first_chunk && nents_first_chunk) {
if (nents <= nents_first_chunk) {
table->nents = table->orig_nents = nents;
sg_init_table(table->sgl, nents);
return 0;
}
}
/* User supposes that the 1st SGL includes real entry */
if (nents_first_chunk <= 1) {
first_chunk = NULL;
nents_first_chunk = 0;
}
ret = __sg_alloc_table(table, nents, SG_CHUNK_SIZE,
first_chunk, GFP_ATOMIC, sg_pool_alloc);
first_chunk, nents_first_chunk,
GFP_ATOMIC, sg_pool_alloc);
if (unlikely(ret))
sg_free_table_chained(table, (bool)first_chunk);
sg_free_table_chained(table, nents_first_chunk);
return ret;
}
EXPORT_SYMBOL_GPL(sg_alloc_table_chained);

5
net/sunrpc/xprtrdma/svc_rdma_rw.c
View File

@ -73,7 +73,8 @@ svc_rdma_get_rw_ctxt(struct svcxprt_rdma *rdma, unsigned int sges)
ctxt->rw_sg_table.sgl = ctxt->rw_first_sgl;
if (sg_alloc_table_chained(&ctxt->rw_sg_table, sges,
ctxt->rw_sg_table.sgl)) {
ctxt->rw_sg_table.sgl,
SG_CHUNK_SIZE)) {
kfree(ctxt);
ctxt = NULL;
}
@ -84,7 +85,7 @@ svc_rdma_get_rw_ctxt(struct svcxprt_rdma *rdma, unsigned int sges)
static void svc_rdma_put_rw_ctxt(struct svcxprt_rdma *rdma,
struct svc_rdma_rw_ctxt *ctxt)
{
sg_free_table_chained(&ctxt->rw_sg_table, true);
sg_free_table_chained(&ctxt->rw_sg_table, SG_CHUNK_SIZE);
spin_lock(&rdma->sc_rw_ctxt_lock);
list_add(&ctxt->rw_list, &rdma->sc_rw_ctxts);