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authorLinus Torvalds <torvalds@linux-foundation.org>2019-07-11 15:17:41 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2019-07-11 15:17:41 -0700
commit1f7563f743d7081710a9d186a8b203997d09f383 (patch)
tree55091227fb177f25c45f33dfb5f0b2a5e22ccfa7
parentba6d10ab8014ac10d25ca513352b6665e73b5785 (diff)
parent3e99b3b13a1fc8f7354edaee4c04f73a07faba69 (diff)
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 ...
-rw-r--r--drivers/nvme/host/fc.c7
-rw-r--r--drivers/nvme/host/rdma.c7
-rw-r--r--drivers/nvme/target/loop.c4
-rw-r--r--drivers/s390/scsi/zfcp_fc.c4
-rw-r--r--drivers/scsi/NCR5380.c41
-rw-r--r--drivers/scsi/advansys.c2
-rw-r--r--drivers/scsi/aha152x.c46
-rw-r--r--drivers/scsi/esp_scsi.c20
-rw-r--r--drivers/scsi/esp_scsi.h2
-rw-r--r--drivers/scsi/imm.c2
-rw-r--r--drivers/scsi/ipr.c29
-rw-r--r--drivers/scsi/lpfc/lpfc_nvmet.c3
-rw-r--r--drivers/scsi/mvumi.c11
-rw-r--r--drivers/scsi/pcmcia/nsp_cs.c4
-rw-r--r--drivers/scsi/pmcraid.c14
-rw-r--r--drivers/scsi/ppa.c2
-rw-r--r--drivers/scsi/scsi_lib.c35
-rw-r--r--drivers/scsi/vmw_pvscsi.c2
-rw-r--r--drivers/scsi/wd33c93.c2
-rw-r--r--drivers/staging/unisys/visorhba/visorhba_main.c9
-rw-r--r--drivers/usb/image/microtek.c20
-rw-r--r--drivers/usb/image/microtek.h2
-rw-r--r--include/linux/scatterlist.h11
-rw-r--r--lib/scatterlist.c36
-rw-r--r--lib/sg_pool.c39
-rw-r--r--net/sunrpc/xprtrdma/svc_rdma_rw.c5
26 files changed, 205 insertions, 154 deletions
diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c
index 9b497d785ed7..dcb2b799966f 100644
--- a/drivers/nvme/host/fc.c
+++ b/drivers/nvme/host/fc.c
@@ -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;
}
diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c
index 97f668a39ae1..676619c1454a 100644
--- a/drivers/nvme/host/rdma.c
+++ b/drivers/nvme/host/rdma.c
@@ -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 @@ out_unmap_sg:
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;
}
diff --git a/drivers/nvme/target/loop.c b/drivers/nvme/target/loop.c
index 9e211ad6bdd3..b16dc3981c69 100644
--- a/drivers/nvme/target/loop.c
+++ b/drivers/nvme/target/loop.c
@@ -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;
diff --git a/drivers/s390/scsi/zfcp_fc.c b/drivers/s390/scsi/zfcp_fc.c
index 33eddb02ee30..b018b61bd168 100644
--- a/drivers/s390/scsi/zfcp_fc.c
+++ b/drivers/s390/scsi/zfcp_fc.c
@@ -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);
diff --git a/drivers/scsi/NCR5380.c b/drivers/scsi/NCR5380.c
index d9fa9cf2fd8b..536426f25e86 100644
--- a/drivers/scsi/NCR5380.c
+++ b/drivers/scsi/NCR5380.c
@@ -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",
- cmd->SCp.this_residual,
- cmd->SCp.buffers_residual);
- }
+ advance_sg_buffer(cmd);
+ dsprintk(NDEBUG_INFORMATION, instance,
+ "this residual %d, sg ents %d\n",
+ cmd->SCp.this_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);
diff --git a/drivers/scsi/advansys.c b/drivers/scsi/advansys.c
index 926311c792d5..a242a62caaa1 100644
--- a/drivers/scsi/advansys.c
+++ b/drivers/scsi/advansys.c
@@ -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;
diff --git a/drivers/scsi/aha152x.c b/drivers/scsi/aha152x.c
index 88c649b3ef61..eb466c2e1839 100644
--- a/drivers/scsi/aha152x.c
+++ b/drivers/scsi/aha152x.c
@@ -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|");
diff --git a/drivers/scsi/esp_scsi.c b/drivers/scsi/esp_scsi.c
index 76e7ca864d6a..bb88995a12c7 100644
--- a/drivers/scsi/esp_scsi.c
+++ b/drivers/scsi/esp_scsi.c
@@ -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++;
diff --git a/drivers/scsi/esp_scsi.h b/drivers/scsi/esp_scsi.h
index aa87a6b72dcc..91b32f2a1a1b 100644
--- a/drivers/scsi/esp_scsi.h
+++ b/drivers/scsi/esp_scsi.h
@@ -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;
diff --git a/drivers/scsi/imm.c b/drivers/scsi/imm.c
index 9751309f8b8c..2519fb7aee51 100644
--- a/drivers/scsi/imm.c
+++ b/drivers/scsi/imm.c
@@ -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);
diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c
index d06bc1a817a1..079c04bc448a 100644
--- a/drivers/scsi/ipr.c
+++ b/drivers/scsi/ipr.c
@@ -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 |=
diff --git a/drivers/scsi/lpfc/lpfc_nvmet.c b/drivers/scsi/lpfc/lpfc_nvmet.c
index d5812719de2b..faa596f9e861 100644
--- a/drivers/scsi/lpfc/lpfc_nvmet.c
+++ b/drivers/scsi/lpfc/lpfc_nvmet.c
@@ -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);
diff --git a/drivers/scsi/mvumi.c b/drivers/scsi/mvumi.c
index 1fb6f6ca627e..8906aceda4c4 100644
--- a/drivers/scsi/mvumi.c
+++ b/drivers/scsi/mvumi.c
@@ -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;
diff --git a/drivers/scsi/pcmcia/nsp_cs.c b/drivers/scsi/pcmcia/nsp_cs.c
index a81748e6e8fb..97416e1dcc5b 100644
--- a/drivers/scsi/pcmcia/nsp_cs.c
+++ b/drivers/scsi/pcmcia/nsp_cs.c
@@ -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;
diff --git a/drivers/scsi/pmcraid.c b/drivers/scsi/pmcraid.c
index ca22526aff7f..71ff3936da4f 100644
--- a/drivers/scsi/pmcraid.c
+++ b/drivers/scsi/pmcraid.c
@@ -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) {
diff --git a/drivers/scsi/ppa.c b/drivers/scsi/ppa.c
index 35213082e933..a406cc825426 100644
--- a/drivers/scsi/ppa.c
+++ b/drivers/scsi/ppa.c
@@ -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);
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index a2fa31417749..e1da8c70a266 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -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;
diff --git a/drivers/scsi/vmw_pvscsi.c b/drivers/scsi/vmw_pvscsi.c
index 377b07b2feeb..70008816c91f 100644
--- a/drivers/scsi/vmw_pvscsi.c
+++ b/drivers/scsi/vmw_pvscsi.c
@@ -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;
diff --git a/drivers/scsi/wd33c93.c b/drivers/scsi/wd33c93.c
index f965a3ee9ce5..fb7b289fa09f 100644
--- a/drivers/scsi/wd33c93.c
+++ b/drivers/scsi/wd33c93.c
@@ -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);
diff --git a/drivers/staging/unisys/visorhba/visorhba_main.c b/drivers/staging/unisys/visorhba/visorhba_main.c
index 2dad36a05518..dd979ee4dcf1 100644
--- a/drivers/staging/unisys/visorhba/visorhba_main.c
+++ b/drivers/staging/unisys/visorhba/visorhba_main.c
@@ -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);
diff --git a/drivers/usb/image/microtek.c b/drivers/usb/image/microtek.c
index 607be1f4fe27..0a57c2cc8e5a 100644
--- a/drivers/usb/image/microtek.c
+++ b/drivers/usb/image/microtek.c
@@ -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;
}
diff --git a/drivers/usb/image/microtek.h b/drivers/usb/image/microtek.h
index 66685e59241a..7bd5f4639c4a 100644
--- a/drivers/usb/image/microtek.h
+++ b/drivers/usb/image/microtek.h
@@ -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 */
};
diff --git a/include/linux/scatterlist.h b/include/linux/scatterlist.h
index 30a9a55c28ba..6eec50fb36c8 100644
--- a/include/linux/scatterlist.h
+++ b/include/linux/scatterlist.h
@@ -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
/*
diff --git a/lib/scatterlist.c b/lib/scatterlist.c
index eacb82468437..c2cf2c311b7d 100644
--- a/lib/scatterlist.c
+++ b/lib/scatterlist.c
@@ -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;
}
diff --git a/lib/sg_pool.c b/lib/sg_pool.c
index cff20df2695e..db29e5c1f790 100644
--- a/lib/sg_pool.c
+++ b/lib/sg_pool.c
@@ -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);
diff --git a/net/sunrpc/xprtrdma/svc_rdma_rw.c b/net/sunrpc/xprtrdma/svc_rdma_rw.c
index 2121c9b4d275..48fe3b16b0d9 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_rw.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_rw.c
@@ -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 @@ out:
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);

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