* [PATCH v3 1/5] scsi: replace "scsi_data_buffer" with "sg_table" in SG functions
2016-04-04 21:48 [PATCH v3 0/5] mempool based chained scatterlist alloc/free api Ming Lin
@ 2016-04-04 21:48 ` Ming Lin
2016-04-12 10:36 ` Sagi Grimberg
2016-04-04 21:48 ` [PATCH v3 2/5] scsi: replace "mq" with "first_chunk" " Ming Lin
` (3 subsequent siblings)
4 siblings, 1 reply; 18+ messages in thread
From: Ming Lin @ 2016-04-04 21:48 UTC (permalink / raw)
To: linux-kernel, linux-scsi; +Cc: Christoph Hellwig, Tejun Heo
From: Ming Lin <ming.l@ssi.samsung.com>
Replace parameter "struct scsi_data_buffer" with "struct sg_table" in
SG alloc/free functions to make them generic.
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ming Lin <ming.l@ssi.samsung.com>
---
drivers/scsi/scsi_lib.c | 41 +++++++++++++++++++++++------------------
1 file changed, 23 insertions(+), 18 deletions(-)
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 8106515..4229c18 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -583,14 +583,14 @@ static struct scatterlist *scsi_sg_alloc(unsigned int nents, gfp_t gfp_mask)
return mempool_alloc(sgp->pool, gfp_mask);
}
-static void scsi_free_sgtable(struct scsi_data_buffer *sdb, bool mq)
+static void scsi_free_sgtable(struct sg_table *table, bool mq)
{
- if (mq && sdb->table.orig_nents <= SCSI_MAX_SG_SEGMENTS)
+ if (mq && table->orig_nents <= SCSI_MAX_SG_SEGMENTS)
return;
- __sg_free_table(&sdb->table, SCSI_MAX_SG_SEGMENTS, mq, scsi_sg_free);
+ __sg_free_table(table, SCSI_MAX_SG_SEGMENTS, mq, scsi_sg_free);
}
-static int scsi_alloc_sgtable(struct scsi_data_buffer *sdb, int nents, bool mq)
+static int scsi_alloc_sgtable(struct sg_table *table, int nents, bool mq)
{
struct scatterlist *first_chunk = NULL;
int ret;
@@ -599,17 +599,17 @@ static int scsi_alloc_sgtable(struct scsi_data_buffer *sdb, int nents, bool mq)
if (mq) {
if (nents <= SCSI_MAX_SG_SEGMENTS) {
- sdb->table.nents = sdb->table.orig_nents = nents;
- sg_init_table(sdb->table.sgl, nents);
+ table->nents = table->orig_nents = nents;
+ sg_init_table(table->sgl, nents);
return 0;
}
- first_chunk = sdb->table.sgl;
+ first_chunk = table->sgl;
}
- ret = __sg_alloc_table(&sdb->table, nents, SCSI_MAX_SG_SEGMENTS,
+ ret = __sg_alloc_table(table, nents, SCSI_MAX_SG_SEGMENTS,
first_chunk, GFP_ATOMIC, scsi_sg_alloc);
if (unlikely(ret))
- scsi_free_sgtable(sdb, mq);
+ scsi_free_sgtable(table, mq);
return ret;
}
@@ -625,12 +625,17 @@ static void scsi_uninit_cmd(struct scsi_cmnd *cmd)
static void scsi_mq_free_sgtables(struct scsi_cmnd *cmd)
{
+ struct scsi_data_buffer *sdb;
+
if (cmd->sdb.table.nents)
- scsi_free_sgtable(&cmd->sdb, true);
- if (cmd->request->next_rq && cmd->request->next_rq->special)
- scsi_free_sgtable(cmd->request->next_rq->special, true);
+ scsi_free_sgtable(&cmd->sdb.table, true);
+ if (cmd->request->next_rq) {
+ sdb = cmd->request->next_rq->special;
+ if (sdb)
+ scsi_free_sgtable(&sdb->table, true);
+ }
if (scsi_prot_sg_count(cmd))
- scsi_free_sgtable(cmd->prot_sdb, true);
+ scsi_free_sgtable(&cmd->prot_sdb->table, true);
}
static void scsi_mq_uninit_cmd(struct scsi_cmnd *cmd)
@@ -669,19 +674,19 @@ static void scsi_mq_uninit_cmd(struct scsi_cmnd *cmd)
static void scsi_release_buffers(struct scsi_cmnd *cmd)
{
if (cmd->sdb.table.nents)
- scsi_free_sgtable(&cmd->sdb, false);
+ scsi_free_sgtable(&cmd->sdb.table, false);
memset(&cmd->sdb, 0, sizeof(cmd->sdb));
if (scsi_prot_sg_count(cmd))
- scsi_free_sgtable(cmd->prot_sdb, false);
+ scsi_free_sgtable(&cmd->prot_sdb->table, false);
}
static void scsi_release_bidi_buffers(struct scsi_cmnd *cmd)
{
struct scsi_data_buffer *bidi_sdb = cmd->request->next_rq->special;
- scsi_free_sgtable(bidi_sdb, false);
+ scsi_free_sgtable(&bidi_sdb->table, false);
kmem_cache_free(scsi_sdb_cache, bidi_sdb);
cmd->request->next_rq->special = NULL;
}
@@ -1085,7 +1090,7 @@ static int scsi_init_sgtable(struct request *req, struct scsi_data_buffer *sdb)
/*
* If sg table allocation fails, requeue request later.
*/
- if (unlikely(scsi_alloc_sgtable(sdb, req->nr_phys_segments,
+ if (unlikely(scsi_alloc_sgtable(&sdb->table, req->nr_phys_segments,
req->mq_ctx != NULL)))
return BLKPREP_DEFER;
@@ -1158,7 +1163,7 @@ int scsi_init_io(struct scsi_cmnd *cmd)
ivecs = blk_rq_count_integrity_sg(rq->q, rq->bio);
- if (scsi_alloc_sgtable(prot_sdb, ivecs, is_mq)) {
+ if (scsi_alloc_sgtable(&prot_sdb->table, ivecs, is_mq)) {
error = BLKPREP_DEFER;
goto err_exit;
}
--
1.9.1
^ permalink raw reply related [flat|nested] 18+ messages in thread* [PATCH v3 2/5] scsi: replace "mq" with "first_chunk" in SG functions
2016-04-04 21:48 [PATCH v3 0/5] mempool based chained scatterlist alloc/free api Ming Lin
2016-04-04 21:48 ` [PATCH v3 1/5] scsi: replace "scsi_data_buffer" with "sg_table" in SG functions Ming Lin
@ 2016-04-04 21:48 ` Ming Lin
2016-04-12 10:36 ` Sagi Grimberg
2016-04-04 21:48 ` [PATCH v3 3/5] scsi: rename SG related struct and functions Ming Lin
` (2 subsequent siblings)
4 siblings, 1 reply; 18+ messages in thread
From: Ming Lin @ 2016-04-04 21:48 UTC (permalink / raw)
To: linux-kernel, linux-scsi; +Cc: Christoph Hellwig, Tejun Heo
From: Ming Lin <ming.l@ssi.samsung.com>
Parameter "bool mq" is block driver specific.
Change it to "first_chunk" to make it more generic.
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ming Lin <ming.l@ssi.samsung.com>
---
drivers/scsi/scsi_lib.c | 20 ++++++++++----------
1 file changed, 10 insertions(+), 10 deletions(-)
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 4229c18..9675353 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -583,33 +583,32 @@ static struct scatterlist *scsi_sg_alloc(unsigned int nents, gfp_t gfp_mask)
return mempool_alloc(sgp->pool, gfp_mask);
}
-static void scsi_free_sgtable(struct sg_table *table, bool mq)
+static void scsi_free_sgtable(struct sg_table *table, bool first_chunk)
{
- if (mq && table->orig_nents <= SCSI_MAX_SG_SEGMENTS)
+ if (first_chunk && table->orig_nents <= SCSI_MAX_SG_SEGMENTS)
return;
- __sg_free_table(table, SCSI_MAX_SG_SEGMENTS, mq, scsi_sg_free);
+ __sg_free_table(table, SCSI_MAX_SG_SEGMENTS, first_chunk, scsi_sg_free);
}
-static int scsi_alloc_sgtable(struct sg_table *table, int nents, bool mq)
+static int scsi_alloc_sgtable(struct sg_table *table, int nents,
+ struct scatterlist *first_chunk)
{
- struct scatterlist *first_chunk = NULL;
int ret;
BUG_ON(!nents);
- if (mq) {
+ if (first_chunk) {
if (nents <= SCSI_MAX_SG_SEGMENTS) {
table->nents = table->orig_nents = nents;
sg_init_table(table->sgl, nents);
return 0;
}
- first_chunk = table->sgl;
}
ret = __sg_alloc_table(table, nents, SCSI_MAX_SG_SEGMENTS,
first_chunk, GFP_ATOMIC, scsi_sg_alloc);
if (unlikely(ret))
- scsi_free_sgtable(table, mq);
+ scsi_free_sgtable(table, (bool)first_chunk);
return ret;
}
@@ -1091,7 +1090,7 @@ static int scsi_init_sgtable(struct request *req, struct scsi_data_buffer *sdb)
* If sg table allocation fails, requeue request later.
*/
if (unlikely(scsi_alloc_sgtable(&sdb->table, req->nr_phys_segments,
- req->mq_ctx != NULL)))
+ sdb->table.sgl)))
return BLKPREP_DEFER;
/*
@@ -1163,7 +1162,8 @@ int scsi_init_io(struct scsi_cmnd *cmd)
ivecs = blk_rq_count_integrity_sg(rq->q, rq->bio);
- if (scsi_alloc_sgtable(&prot_sdb->table, ivecs, is_mq)) {
+ if (scsi_alloc_sgtable(&prot_sdb->table, ivecs,
+ prot_sdb->table.sgl)) {
error = BLKPREP_DEFER;
goto err_exit;
}
--
1.9.1
^ permalink raw reply related [flat|nested] 18+ messages in thread* [PATCH v3 3/5] scsi: rename SG related struct and functions
2016-04-04 21:48 [PATCH v3 0/5] mempool based chained scatterlist alloc/free api Ming Lin
2016-04-04 21:48 ` [PATCH v3 1/5] scsi: replace "scsi_data_buffer" with "sg_table" in SG functions Ming Lin
2016-04-04 21:48 ` [PATCH v3 2/5] scsi: replace "mq" with "first_chunk" " Ming Lin
@ 2016-04-04 21:48 ` Ming Lin
2016-04-12 10:40 ` Sagi Grimberg
2016-04-04 21:48 ` [PATCH v3 4/5] scsi: rename SCSI_MAX_{SG, SG_CHAIN}_SEGMENTS Ming Lin
2016-04-04 21:48 ` [PATCH v3 5/5] lib: scatterlist: move SG pool code from SCSI driver to lib/sg_pool.c Ming Lin
4 siblings, 1 reply; 18+ messages in thread
From: Ming Lin @ 2016-04-04 21:48 UTC (permalink / raw)
To: linux-kernel, linux-scsi; +Cc: Christoph Hellwig, Tejun Heo
From: Ming Lin <ming.l@ssi.samsung.com>
Rename SCSI specific struct and functions to more genenic names.
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ming Lin <ming.l@ssi.samsung.com>
---
drivers/scsi/scsi_lib.c | 52 ++++++++++++++++++++++++-------------------------
1 file changed, 26 insertions(+), 26 deletions(-)
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 9675353..08134f6 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -40,10 +40,10 @@
#include "scsi_logging.h"
-#define SG_MEMPOOL_NR ARRAY_SIZE(scsi_sg_pools)
+#define SG_MEMPOOL_NR ARRAY_SIZE(sg_pools)
#define SG_MEMPOOL_SIZE 2
-struct scsi_host_sg_pool {
+struct sg_pool {
size_t size;
char *name;
struct kmem_cache *slab;
@@ -54,7 +54,7 @@ struct scsi_host_sg_pool {
#if (SCSI_MAX_SG_SEGMENTS < 32)
#error SCSI_MAX_SG_SEGMENTS is too small (must be 32 or greater)
#endif
-static struct scsi_host_sg_pool scsi_sg_pools[] = {
+static struct sg_pool sg_pools[] = {
SP(8),
SP(16),
#if (SCSI_MAX_SG_SEGMENTS > 32)
@@ -553,7 +553,7 @@ void scsi_run_host_queues(struct Scsi_Host *shost)
scsi_run_queue(sdev->request_queue);
}
-static inline unsigned int scsi_sgtable_index(unsigned short nents)
+static inline unsigned int sg_pool_index(unsigned short nents)
{
unsigned int index;
@@ -567,30 +567,30 @@ static inline unsigned int scsi_sgtable_index(unsigned short nents)
return index;
}
-static void scsi_sg_free(struct scatterlist *sgl, unsigned int nents)
+static void sg_pool_free(struct scatterlist *sgl, unsigned int nents)
{
- struct scsi_host_sg_pool *sgp;
+ struct sg_pool *sgp;
- sgp = scsi_sg_pools + scsi_sgtable_index(nents);
+ sgp = sg_pools + sg_pool_index(nents);
mempool_free(sgl, sgp->pool);
}
-static struct scatterlist *scsi_sg_alloc(unsigned int nents, gfp_t gfp_mask)
+static struct scatterlist *sg_pool_alloc(unsigned int nents, gfp_t gfp_mask)
{
- struct scsi_host_sg_pool *sgp;
+ struct sg_pool *sgp;
- sgp = scsi_sg_pools + scsi_sgtable_index(nents);
+ sgp = sg_pools + sg_pool_index(nents);
return mempool_alloc(sgp->pool, gfp_mask);
}
-static void scsi_free_sgtable(struct sg_table *table, bool first_chunk)
+static void sg_free_table_chained(struct sg_table *table, bool first_chunk)
{
if (first_chunk && table->orig_nents <= SCSI_MAX_SG_SEGMENTS)
return;
- __sg_free_table(table, SCSI_MAX_SG_SEGMENTS, first_chunk, scsi_sg_free);
+ __sg_free_table(table, SCSI_MAX_SG_SEGMENTS, first_chunk, sg_pool_free);
}
-static int scsi_alloc_sgtable(struct sg_table *table, int nents,
+static int sg_alloc_table_chained(struct sg_table *table, int nents,
struct scatterlist *first_chunk)
{
int ret;
@@ -606,9 +606,9 @@ static int scsi_alloc_sgtable(struct sg_table *table, int nents,
}
ret = __sg_alloc_table(table, nents, SCSI_MAX_SG_SEGMENTS,
- first_chunk, GFP_ATOMIC, scsi_sg_alloc);
+ first_chunk, GFP_ATOMIC, sg_pool_alloc);
if (unlikely(ret))
- scsi_free_sgtable(table, (bool)first_chunk);
+ sg_free_table_chained(table, (bool)first_chunk);
return ret;
}
@@ -627,14 +627,14 @@ static void scsi_mq_free_sgtables(struct scsi_cmnd *cmd)
struct scsi_data_buffer *sdb;
if (cmd->sdb.table.nents)
- scsi_free_sgtable(&cmd->sdb.table, true);
+ sg_free_table_chained(&cmd->sdb.table, true);
if (cmd->request->next_rq) {
sdb = cmd->request->next_rq->special;
if (sdb)
- scsi_free_sgtable(&sdb->table, true);
+ sg_free_table_chained(&sdb->table, true);
}
if (scsi_prot_sg_count(cmd))
- scsi_free_sgtable(&cmd->prot_sdb->table, true);
+ sg_free_table_chained(&cmd->prot_sdb->table, true);
}
static void scsi_mq_uninit_cmd(struct scsi_cmnd *cmd)
@@ -673,19 +673,19 @@ static void scsi_mq_uninit_cmd(struct scsi_cmnd *cmd)
static void scsi_release_buffers(struct scsi_cmnd *cmd)
{
if (cmd->sdb.table.nents)
- scsi_free_sgtable(&cmd->sdb.table, false);
+ sg_free_table_chained(&cmd->sdb.table, false);
memset(&cmd->sdb, 0, sizeof(cmd->sdb));
if (scsi_prot_sg_count(cmd))
- scsi_free_sgtable(&cmd->prot_sdb->table, false);
+ sg_free_table_chained(&cmd->prot_sdb->table, false);
}
static void scsi_release_bidi_buffers(struct scsi_cmnd *cmd)
{
struct scsi_data_buffer *bidi_sdb = cmd->request->next_rq->special;
- scsi_free_sgtable(&bidi_sdb->table, false);
+ sg_free_table_chained(&bidi_sdb->table, false);
kmem_cache_free(scsi_sdb_cache, bidi_sdb);
cmd->request->next_rq->special = NULL;
}
@@ -1089,7 +1089,7 @@ static int scsi_init_sgtable(struct request *req, struct scsi_data_buffer *sdb)
/*
* If sg table allocation fails, requeue request later.
*/
- if (unlikely(scsi_alloc_sgtable(&sdb->table, req->nr_phys_segments,
+ if (unlikely(sg_alloc_table_chained(&sdb->table, req->nr_phys_segments,
sdb->table.sgl)))
return BLKPREP_DEFER;
@@ -1162,7 +1162,7 @@ int scsi_init_io(struct scsi_cmnd *cmd)
ivecs = blk_rq_count_integrity_sg(rq->q, rq->bio);
- if (scsi_alloc_sgtable(&prot_sdb->table, ivecs,
+ if (sg_alloc_table_chained(&prot_sdb->table, ivecs,
prot_sdb->table.sgl)) {
error = BLKPREP_DEFER;
goto err_exit;
@@ -2280,7 +2280,7 @@ int __init scsi_init_queue(void)
}
for (i = 0; i < SG_MEMPOOL_NR; i++) {
- struct scsi_host_sg_pool *sgp = scsi_sg_pools + i;
+ struct sg_pool *sgp = sg_pools + i;
int size = sgp->size * sizeof(struct scatterlist);
sgp->slab = kmem_cache_create(sgp->name, size, 0,
@@ -2304,7 +2304,7 @@ int __init scsi_init_queue(void)
cleanup_sdb:
for (i = 0; i < SG_MEMPOOL_NR; i++) {
- struct scsi_host_sg_pool *sgp = scsi_sg_pools + i;
+ struct sg_pool *sgp = sg_pools + i;
if (sgp->pool)
mempool_destroy(sgp->pool);
if (sgp->slab)
@@ -2322,7 +2322,7 @@ void scsi_exit_queue(void)
kmem_cache_destroy(scsi_sdb_cache);
for (i = 0; i < SG_MEMPOOL_NR; i++) {
- struct scsi_host_sg_pool *sgp = scsi_sg_pools + i;
+ struct sg_pool *sgp = sg_pools + i;
mempool_destroy(sgp->pool);
kmem_cache_destroy(sgp->slab);
}
--
1.9.1
^ permalink raw reply related [flat|nested] 18+ messages in thread* [PATCH v3 4/5] scsi: rename SCSI_MAX_{SG, SG_CHAIN}_SEGMENTS
2016-04-04 21:48 [PATCH v3 0/5] mempool based chained scatterlist alloc/free api Ming Lin
` (2 preceding siblings ...)
2016-04-04 21:48 ` [PATCH v3 3/5] scsi: rename SG related struct and functions Ming Lin
@ 2016-04-04 21:48 ` Ming Lin
2016-04-05 14:55 ` Tejun Heo
2016-04-04 21:48 ` [PATCH v3 5/5] lib: scatterlist: move SG pool code from SCSI driver to lib/sg_pool.c Ming Lin
4 siblings, 1 reply; 18+ messages in thread
From: Ming Lin @ 2016-04-04 21:48 UTC (permalink / raw)
To: linux-kernel, linux-scsi; +Cc: Christoph Hellwig, Tejun Heo
From: Ming Lin <ming.l@ssi.samsung.com>
Rename SCSI_MAX_SG_SEGMENTS to SG_CHUNK_SIZE, which means the amount
we fit into a single scatterlist chunk.
Rename SCSI_MAX_SG_CHAIN_SEGMENTS to SG_MAX_SEGMENTS.
Will move these 2 generic definitions to scatterlist.h later.
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Bart Van Assche <bart.vanassche@sandisk.com> (for ib_srp changes)
Signed-off-by: Ming Lin <ming.l@ssi.samsung.com>
---
drivers/ata/pata_icside.c | 2 +-
drivers/infiniband/ulp/srp/ib_srp.c | 4 ++--
drivers/scsi/arm/cumana_2.c | 2 +-
drivers/scsi/arm/eesox.c | 2 +-
drivers/scsi/arm/powertec.c | 2 +-
drivers/scsi/esas2r/esas2r_main.c | 4 ++--
drivers/scsi/hisi_sas/hisi_sas.h | 2 +-
drivers/scsi/mpt3sas/mpt3sas_base.c | 4 ++--
drivers/scsi/mpt3sas/mpt3sas_base.h | 2 +-
drivers/scsi/scsi_debug.c | 2 +-
drivers/scsi/scsi_lib.c | 34 +++++++++++++++++-----------------
drivers/usb/storage/scsiglue.c | 2 +-
include/scsi/scsi.h | 8 ++++----
include/scsi/scsi_host.h | 2 +-
14 files changed, 36 insertions(+), 36 deletions(-)
diff --git a/drivers/ata/pata_icside.c b/drivers/ata/pata_icside.c
index d7c7320..188f2f2 100644
--- a/drivers/ata/pata_icside.c
+++ b/drivers/ata/pata_icside.c
@@ -294,7 +294,7 @@ static int icside_dma_init(struct pata_icside_info *info)
static struct scsi_host_template pata_icside_sht = {
ATA_BASE_SHT(DRV_NAME),
- .sg_tablesize = SCSI_MAX_SG_CHAIN_SEGMENTS,
+ .sg_tablesize = SG_MAX_SEGMENTS,
.dma_boundary = IOMD_DMA_BOUNDARY,
};
diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c
index ff21597..369a75e 100644
--- a/drivers/infiniband/ulp/srp/ib_srp.c
+++ b/drivers/infiniband/ulp/srp/ib_srp.c
@@ -81,7 +81,7 @@ MODULE_PARM_DESC(cmd_sg_entries,
module_param(indirect_sg_entries, uint, 0444);
MODULE_PARM_DESC(indirect_sg_entries,
- "Default max number of gather/scatter entries (default is 12, max is " __stringify(SCSI_MAX_SG_CHAIN_SEGMENTS) ")");
+ "Default max number of gather/scatter entries (default is 12, max is " __stringify(SG_MAX_SEGMENTS) ")");
module_param(allow_ext_sg, bool, 0444);
MODULE_PARM_DESC(allow_ext_sg,
@@ -3097,7 +3097,7 @@ static int srp_parse_options(const char *buf, struct srp_target_port *target)
case SRP_OPT_SG_TABLESIZE:
if (match_int(args, &token) || token < 1 ||
- token > SCSI_MAX_SG_CHAIN_SEGMENTS) {
+ token > SG_MAX_SEGMENTS) {
pr_warn("bad max sg_tablesize parameter '%s'\n",
p);
goto out;
diff --git a/drivers/scsi/arm/cumana_2.c b/drivers/scsi/arm/cumana_2.c
index faa1bee..edce5f3 100644
--- a/drivers/scsi/arm/cumana_2.c
+++ b/drivers/scsi/arm/cumana_2.c
@@ -365,7 +365,7 @@ static struct scsi_host_template cumanascsi2_template = {
.eh_abort_handler = fas216_eh_abort,
.can_queue = 1,
.this_id = 7,
- .sg_tablesize = SCSI_MAX_SG_CHAIN_SEGMENTS,
+ .sg_tablesize = SG_MAX_SEGMENTS,
.dma_boundary = IOMD_DMA_BOUNDARY,
.use_clustering = DISABLE_CLUSTERING,
.proc_name = "cumanascsi2",
diff --git a/drivers/scsi/arm/eesox.c b/drivers/scsi/arm/eesox.c
index a8ad688..e93e047 100644
--- a/drivers/scsi/arm/eesox.c
+++ b/drivers/scsi/arm/eesox.c
@@ -484,7 +484,7 @@ static struct scsi_host_template eesox_template = {
.eh_abort_handler = fas216_eh_abort,
.can_queue = 1,
.this_id = 7,
- .sg_tablesize = SCSI_MAX_SG_CHAIN_SEGMENTS,
+ .sg_tablesize = SG_MAX_SEGMENTS,
.dma_boundary = IOMD_DMA_BOUNDARY,
.use_clustering = DISABLE_CLUSTERING,
.proc_name = "eesox",
diff --git a/drivers/scsi/arm/powertec.c b/drivers/scsi/arm/powertec.c
index 5e1b73e..79aa889 100644
--- a/drivers/scsi/arm/powertec.c
+++ b/drivers/scsi/arm/powertec.c
@@ -291,7 +291,7 @@ static struct scsi_host_template powertecscsi_template = {
.can_queue = 8,
.this_id = 7,
- .sg_tablesize = SCSI_MAX_SG_CHAIN_SEGMENTS,
+ .sg_tablesize = SG_MAX_SEGMENTS,
.dma_boundary = IOMD_DMA_BOUNDARY,
.cmd_per_lun = 2,
.use_clustering = ENABLE_CLUSTERING,
diff --git a/drivers/scsi/esas2r/esas2r_main.c b/drivers/scsi/esas2r/esas2r_main.c
index 33581ba..2aca4d1 100644
--- a/drivers/scsi/esas2r/esas2r_main.c
+++ b/drivers/scsi/esas2r/esas2r_main.c
@@ -246,7 +246,7 @@ static struct scsi_host_template driver_template = {
.eh_target_reset_handler = esas2r_target_reset,
.can_queue = 128,
.this_id = -1,
- .sg_tablesize = SCSI_MAX_SG_SEGMENTS,
+ .sg_tablesize = SG_CHUNK_SIZE,
.cmd_per_lun =
ESAS2R_DEFAULT_CMD_PER_LUN,
.present = 0,
@@ -271,7 +271,7 @@ module_param(num_sg_lists, int, 0);
MODULE_PARM_DESC(num_sg_lists,
"Number of scatter/gather lists. Default 1024.");
-int sg_tablesize = SCSI_MAX_SG_SEGMENTS;
+int sg_tablesize = SG_CHUNK_SIZE;
module_param(sg_tablesize, int, 0);
MODULE_PARM_DESC(sg_tablesize,
"Maximum number of entries in a scatter/gather table.");
diff --git a/drivers/scsi/hisi_sas/hisi_sas.h b/drivers/scsi/hisi_sas/hisi_sas.h
index 29e89f3..fa12eea 100644
--- a/drivers/scsi/hisi_sas/hisi_sas.h
+++ b/drivers/scsi/hisi_sas/hisi_sas.h
@@ -298,7 +298,7 @@ struct hisi_sas_command_table_stp {
u8 atapi_cdb[ATAPI_CDB_LEN];
};
-#define HISI_SAS_SGE_PAGE_CNT SCSI_MAX_SG_SEGMENTS
+#define HISI_SAS_SGE_PAGE_CNT SG_CHUNK_SIZE
struct hisi_sas_sge_page {
struct hisi_sas_sge sge[HISI_SAS_SGE_PAGE_CNT];
};
diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.c b/drivers/scsi/mpt3sas/mpt3sas_base.c
index 8c44b9c..28d8531 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_base.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_base.c
@@ -3207,10 +3207,10 @@ _base_allocate_memory_pools(struct MPT3SAS_ADAPTER *ioc, int sleep_flag)
sg_tablesize = MPT_MIN_PHYS_SEGMENTS;
else if (sg_tablesize > MPT_MAX_PHYS_SEGMENTS) {
sg_tablesize = min_t(unsigned short, sg_tablesize,
- SCSI_MAX_SG_CHAIN_SEGMENTS);
+ SG_MAX_SEGMENTS);
pr_warn(MPT3SAS_FMT
"sg_tablesize(%u) is bigger than kernel"
- " defined SCSI_MAX_SG_SEGMENTS(%u)\n", ioc->name,
+ " defined SG_CHUNK_SIZE(%u)\n", ioc->name,
sg_tablesize, MPT_MAX_PHYS_SEGMENTS);
}
ioc->shost->sg_tablesize = sg_tablesize;
diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.h b/drivers/scsi/mpt3sas/mpt3sas_base.h
index 32580b5..6940c57 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_base.h
+++ b/drivers/scsi/mpt3sas/mpt3sas_base.h
@@ -90,7 +90,7 @@
/*
* Set MPT3SAS_SG_DEPTH value based on user input.
*/
-#define MPT_MAX_PHYS_SEGMENTS SCSI_MAX_SG_SEGMENTS
+#define MPT_MAX_PHYS_SEGMENTS SG_CHUNK_SIZE
#define MPT_MIN_PHYS_SEGMENTS 16
#ifdef CONFIG_SCSI_MPT3SAS_MAX_SGE
diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index f3d69a98..06b1517 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -5305,7 +5305,7 @@ static struct scsi_host_template sdebug_driver_template = {
.eh_host_reset_handler = scsi_debug_host_reset,
.can_queue = SCSI_DEBUG_CANQUEUE,
.this_id = 7,
- .sg_tablesize = SCSI_MAX_SG_CHAIN_SEGMENTS,
+ .sg_tablesize = SG_MAX_SEGMENTS,
.cmd_per_lun = DEF_CMD_PER_LUN,
.max_sectors = -1U,
.use_clustering = DISABLE_CLUSTERING,
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 08134f6..8f776f1 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -51,25 +51,25 @@ struct sg_pool {
};
#define SP(x) { .size = x, "sgpool-" __stringify(x) }
-#if (SCSI_MAX_SG_SEGMENTS < 32)
-#error SCSI_MAX_SG_SEGMENTS is too small (must be 32 or greater)
+#if (SG_CHUNK_SIZE < 32)
+#error SG_CHUNK_SIZE is too small (must be 32 or greater)
#endif
static struct sg_pool sg_pools[] = {
SP(8),
SP(16),
-#if (SCSI_MAX_SG_SEGMENTS > 32)
+#if (SG_CHUNK_SIZE > 32)
SP(32),
-#if (SCSI_MAX_SG_SEGMENTS > 64)
+#if (SG_CHUNK_SIZE > 64)
SP(64),
-#if (SCSI_MAX_SG_SEGMENTS > 128)
+#if (SG_CHUNK_SIZE > 128)
SP(128),
-#if (SCSI_MAX_SG_SEGMENTS > 256)
-#error SCSI_MAX_SG_SEGMENTS is too large (256 MAX)
+#if (SG_CHUNK_SIZE > 256)
+#error SG_CHUNK_SIZE is too large (256 MAX)
#endif
#endif
#endif
#endif
- SP(SCSI_MAX_SG_SEGMENTS)
+ SP(SG_CHUNK_SIZE)
};
#undef SP
@@ -557,7 +557,7 @@ static inline unsigned int sg_pool_index(unsigned short nents)
{
unsigned int index;
- BUG_ON(nents > SCSI_MAX_SG_SEGMENTS);
+ BUG_ON(nents > SG_CHUNK_SIZE);
if (nents <= 8)
index = 0;
@@ -585,9 +585,9 @@ static struct scatterlist *sg_pool_alloc(unsigned int nents, gfp_t gfp_mask)
static void sg_free_table_chained(struct sg_table *table, bool first_chunk)
{
- if (first_chunk && table->orig_nents <= SCSI_MAX_SG_SEGMENTS)
+ if (first_chunk && table->orig_nents <= SG_CHUNK_SIZE)
return;
- __sg_free_table(table, SCSI_MAX_SG_SEGMENTS, first_chunk, sg_pool_free);
+ __sg_free_table(table, SG_CHUNK_SIZE, first_chunk, sg_pool_free);
}
static int sg_alloc_table_chained(struct sg_table *table, int nents,
@@ -598,14 +598,14 @@ static int sg_alloc_table_chained(struct sg_table *table, int nents,
BUG_ON(!nents);
if (first_chunk) {
- if (nents <= SCSI_MAX_SG_SEGMENTS) {
+ if (nents <= SG_CHUNK_SIZE) {
table->nents = table->orig_nents = nents;
sg_init_table(table->sgl, nents);
return 0;
}
}
- ret = __sg_alloc_table(table, nents, SCSI_MAX_SG_SEGMENTS,
+ ret = __sg_alloc_table(table, nents, SG_CHUNK_SIZE,
first_chunk, GFP_ATOMIC, sg_pool_alloc);
if (unlikely(ret))
sg_free_table_chained(table, (bool)first_chunk);
@@ -1937,7 +1937,7 @@ static int scsi_mq_prep_fn(struct request *req)
if (scsi_host_get_prot(shost)) {
cmd->prot_sdb = (void *)sg +
min_t(unsigned int,
- shost->sg_tablesize, SCSI_MAX_SG_SEGMENTS) *
+ shost->sg_tablesize, SG_CHUNK_SIZE) *
sizeof(struct scatterlist);
memset(cmd->prot_sdb, 0, sizeof(struct scsi_data_buffer));
@@ -2110,7 +2110,7 @@ static void __scsi_init_queue(struct Scsi_Host *shost, struct request_queue *q)
* this limit is imposed by hardware restrictions
*/
blk_queue_max_segments(q, min_t(unsigned short, shost->sg_tablesize,
- SCSI_MAX_SG_CHAIN_SEGMENTS));
+ SG_MAX_SEGMENTS));
if (scsi_host_prot_dma(shost)) {
shost->sg_prot_tablesize =
@@ -2192,8 +2192,8 @@ int scsi_mq_setup_tags(struct Scsi_Host *shost)
unsigned int cmd_size, sgl_size, tbl_size;
tbl_size = shost->sg_tablesize;
- if (tbl_size > SCSI_MAX_SG_SEGMENTS)
- tbl_size = SCSI_MAX_SG_SEGMENTS;
+ if (tbl_size > SG_CHUNK_SIZE)
+ tbl_size = SG_CHUNK_SIZE;
sgl_size = tbl_size * sizeof(struct scatterlist);
cmd_size = sizeof(struct scsi_cmnd) + shost->hostt->cmd_size + sgl_size;
if (scsi_host_get_prot(shost))
diff --git a/drivers/usb/storage/scsiglue.c b/drivers/usb/storage/scsiglue.c
index dba5136..82e5eddc 100644
--- a/drivers/usb/storage/scsiglue.c
+++ b/drivers/usb/storage/scsiglue.c
@@ -563,7 +563,7 @@ static const struct scsi_host_template usb_stor_host_template = {
.target_alloc = target_alloc,
/* lots of sg segments can be handled */
- .sg_tablesize = SCSI_MAX_SG_CHAIN_SEGMENTS,
+ .sg_tablesize = SG_MAX_SEGMENTS,
/* limit the total size of a transfer to 120 KB */
.max_sectors = 240,
diff --git a/include/scsi/scsi.h b/include/scsi/scsi.h
index e0a3398..74dafa7 100644
--- a/include/scsi/scsi.h
+++ b/include/scsi/scsi.h
@@ -24,16 +24,16 @@ enum scsi_timeouts {
* to SG_MAX_SINGLE_ALLOC to pack correctly at the highest order. The
* minimum value is 32
*/
-#define SCSI_MAX_SG_SEGMENTS 128
+#define SG_CHUNK_SIZE 128
/*
- * Like SCSI_MAX_SG_SEGMENTS, but for archs that have sg chaining. This limit
+ * Like SG_CHUNK_SIZE, but for archs that have sg chaining. This limit
* is totally arbitrary, a setting of 2048 will get you at least 8mb ios.
*/
#ifdef CONFIG_ARCH_HAS_SG_CHAIN
-#define SCSI_MAX_SG_CHAIN_SEGMENTS 2048
+#define SG_MAX_SEGMENTS 2048
#else
-#define SCSI_MAX_SG_CHAIN_SEGMENTS SCSI_MAX_SG_SEGMENTS
+#define SG_MAX_SEGMENTS SG_CHUNK_SIZE
#endif
/*
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index fcfa3d7..76e9d27 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -37,7 +37,7 @@ struct blk_queue_tags;
* used in one scatter-gather request.
*/
#define SG_NONE 0
-#define SG_ALL SCSI_MAX_SG_SEGMENTS
+#define SG_ALL SG_CHUNK_SIZE
#define MODE_UNKNOWN 0x00
#define MODE_INITIATOR 0x01
--
1.9.1
^ permalink raw reply related [flat|nested] 18+ messages in thread* Re: [PATCH v3 4/5] scsi: rename SCSI_MAX_{SG, SG_CHAIN}_SEGMENTS
2016-04-04 21:48 ` [PATCH v3 4/5] scsi: rename SCSI_MAX_{SG, SG_CHAIN}_SEGMENTS Ming Lin
@ 2016-04-05 14:55 ` Tejun Heo
2016-04-11 5:20 ` Ming Lin
0 siblings, 1 reply; 18+ messages in thread
From: Tejun Heo @ 2016-04-05 14:55 UTC (permalink / raw)
To: Ming Lin; +Cc: linux-kernel, linux-scsi, Christoph Hellwig
On Mon, Apr 04, 2016 at 02:48:10PM -0700, Ming Lin wrote:
> From: Ming Lin <ming.l@ssi.samsung.com>
>
> Rename SCSI_MAX_SG_SEGMENTS to SG_CHUNK_SIZE, which means the amount
> we fit into a single scatterlist chunk.
>
> Rename SCSI_MAX_SG_CHAIN_SEGMENTS to SG_MAX_SEGMENTS.
>
> Will move these 2 generic definitions to scatterlist.h later.
>
> Reviewed-by: Christoph Hellwig <hch@lst.de>
> Acked-by: Bart Van Assche <bart.vanassche@sandisk.com> (for ib_srp changes)
> Signed-off-by: Ming Lin <ming.l@ssi.samsung.com>
For libata,
Acked-by: Tejun Heo <tj@kernel.org>
Thanks.
--
tejun
^ permalink raw reply [flat|nested] 18+ messages in thread* Re: [PATCH v3 4/5] scsi: rename SCSI_MAX_{SG, SG_CHAIN}_SEGMENTS
2016-04-05 14:55 ` Tejun Heo
@ 2016-04-11 5:20 ` Ming Lin
2016-04-11 21:34 ` Martin K. Petersen
2016-04-12 22:00 ` Martin K. Petersen
0 siblings, 2 replies; 18+ messages in thread
From: Ming Lin @ 2016-04-11 5:20 UTC (permalink / raw)
To: Tejun Heo, Jej B; +Cc: lkml, linux-scsi@vger.kernel.org, Christoph Hellwig
On Tue, Apr 5, 2016 at 7:55 AM, Tejun Heo <tj@kernel.org> wrote:
> On Mon, Apr 04, 2016 at 02:48:10PM -0700, Ming Lin wrote:
>> From: Ming Lin <ming.l@ssi.samsung.com>
>>
>> Rename SCSI_MAX_SG_SEGMENTS to SG_CHUNK_SIZE, which means the amount
>> we fit into a single scatterlist chunk.
>>
>> Rename SCSI_MAX_SG_CHAIN_SEGMENTS to SG_MAX_SEGMENTS.
>>
>> Will move these 2 generic definitions to scatterlist.h later.
>>
>> Reviewed-by: Christoph Hellwig <hch@lst.de>
>> Acked-by: Bart Van Assche <bart.vanassche@sandisk.com> (for ib_srp changes)
>> Signed-off-by: Ming Lin <ming.l@ssi.samsung.com>
>
> For libata,
>
> Acked-by: Tejun Heo <tj@kernel.org>
Hi James,
Are we ready to merge it?
Thanks,
Ming
^ permalink raw reply [flat|nested] 18+ messages in thread* Re: [PATCH v3 4/5] scsi: rename SCSI_MAX_{SG, SG_CHAIN}_SEGMENTS
2016-04-11 5:20 ` Ming Lin
@ 2016-04-11 21:34 ` Martin K. Petersen
2016-04-11 22:04 ` Ming Lin
2016-04-12 10:34 ` Sagi Grimberg
2016-04-12 22:00 ` Martin K. Petersen
1 sibling, 2 replies; 18+ messages in thread
From: Martin K. Petersen @ 2016-04-11 21:34 UTC (permalink / raw)
To: Ming Lin
Cc: Tejun Heo, Jej B, lkml, linux-scsi@vger.kernel.org,
Christoph Hellwig, sagi
>>>>> "Ming" == Ming Lin <mlin@kernel.org> writes:
Ming> Are we ready to merge it?
We're still missing an ack from Sagi.
--
Martin K. Petersen Oracle Linux Engineering
^ permalink raw reply [flat|nested] 18+ messages in thread* Re: [PATCH v3 4/5] scsi: rename SCSI_MAX_{SG, SG_CHAIN}_SEGMENTS
2016-04-11 21:34 ` Martin K. Petersen
@ 2016-04-11 22:04 ` Ming Lin
2016-04-12 2:43 ` Bart Van Assche
2016-04-12 10:34 ` Sagi Grimberg
1 sibling, 1 reply; 18+ messages in thread
From: Ming Lin @ 2016-04-11 22:04 UTC (permalink / raw)
To: Martin K. Petersen
Cc: Tejun Heo, Jej B, lkml, linux-scsi@vger.kernel.org,
Christoph Hellwig, sagi
On Mon, Apr 11, 2016 at 2:34 PM, Martin K. Petersen
<martin.petersen@oracle.com> wrote:
>>>>>> "Ming" == Ming Lin <mlin@kernel.org> writes:
>
> Ming> Are we ready to merge it?
>
> We're still missing an ack from Sagi.
Thought we already had a ack from Bart.
OK, let's get one more from Sagi.
^ permalink raw reply [flat|nested] 18+ messages in thread* Re: [PATCH v3 4/5] scsi: rename SCSI_MAX_{SG, SG_CHAIN}_SEGMENTS
2016-04-11 22:04 ` Ming Lin
@ 2016-04-12 2:43 ` Bart Van Assche
2016-04-12 10:42 ` Sagi Grimberg
0 siblings, 1 reply; 18+ messages in thread
From: Bart Van Assche @ 2016-04-12 2:43 UTC (permalink / raw)
To: Ming Lin, Martin K. Petersen
Cc: Tejun Heo, Jej B, lkml, linux-scsi@vger.kernel.org,
Christoph Hellwig, sagi
On 04/11/16 15:04, Ming Lin wrote:
> On Mon, Apr 11, 2016 at 2:34 PM, Martin K. Petersen
> <martin.petersen@oracle.com> wrote:
>>>>>>> "Ming" == Ming Lin <mlin@kernel.org> writes:
>>
>> Ming> Are we ready to merge it?
>>
>> We're still missing an ack from Sagi.
>
> Thought we already had a ack from Bart.
> OK, let's get one more from Sagi.
Hmm ... this patch doesn't touch any code for which Sagi is the
maintainer so I think my ack for the ib_srp changes is sufficient.
Bart.
^ permalink raw reply [flat|nested] 18+ messages in thread* Re: [PATCH v3 4/5] scsi: rename SCSI_MAX_{SG, SG_CHAIN}_SEGMENTS
2016-04-12 2:43 ` Bart Van Assche
@ 2016-04-12 10:42 ` Sagi Grimberg
0 siblings, 0 replies; 18+ messages in thread
From: Sagi Grimberg @ 2016-04-12 10:42 UTC (permalink / raw)
To: Bart Van Assche, Ming Lin, Martin K. Petersen
Cc: Tejun Heo, Jej B, lkml, linux-scsi@vger.kernel.org,
Christoph Hellwig
>> <martin.petersen@oracle.com> wrote:
>>>>>>>> "Ming" == Ming Lin <mlin@kernel.org> writes:
>>>
>>> Ming> Are we ready to merge it?
>>>
>>> We're still missing an ack from Sagi.
>>
>> Thought we already had a ack from Bart.
>> OK, let's get one more from Sagi.
>
> Hmm ... this patch doesn't touch any code for which Sagi is the
> maintainer so I think my ack for the ib_srp changes is sufficient.
Indeed no need for my ack, but a review tag can't hurt ;)
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
^ permalink raw reply [flat|nested] 18+ messages in thread
* Re: [PATCH v3 4/5] scsi: rename SCSI_MAX_{SG, SG_CHAIN}_SEGMENTS
2016-04-11 21:34 ` Martin K. Petersen
2016-04-11 22:04 ` Ming Lin
@ 2016-04-12 10:34 ` Sagi Grimberg
1 sibling, 0 replies; 18+ messages in thread
From: Sagi Grimberg @ 2016-04-12 10:34 UTC (permalink / raw)
To: Martin K. Petersen, Ming Lin
Cc: Tejun Heo, Jej B, lkml, linux-scsi@vger.kernel.org,
Christoph Hellwig
> We're still missing an ack from Sagi.
Oops, wasn't aware that mine was needed.
I reviewed these on the nvme-fabrics project.
I'll add my review tags too.
^ permalink raw reply [flat|nested] 18+ messages in thread
* Re: [PATCH v3 4/5] scsi: rename SCSI_MAX_{SG, SG_CHAIN}_SEGMENTS
2016-04-11 5:20 ` Ming Lin
2016-04-11 21:34 ` Martin K. Petersen
@ 2016-04-12 22:00 ` Martin K. Petersen
1 sibling, 0 replies; 18+ messages in thread
From: Martin K. Petersen @ 2016-04-12 22:00 UTC (permalink / raw)
To: Ming Lin
Cc: Tejun Heo, Jej B, lkml, linux-scsi@vger.kernel.org,
Christoph Hellwig
>>>>> "Ming" == Ming Lin <mlin@kernel.org> writes:
Ming> Are we ready to merge it?
I have queued your patches in my for-next branch. Will let them simmer
there for a bit so they can get tested in linux-next. Barring any
problems I will shuffle them over to 4.7/scsi-queue at the end of the
week.
--
Martin K. Petersen Oracle Linux Engineering
^ permalink raw reply [flat|nested] 18+ messages in thread
* [PATCH v3 5/5] lib: scatterlist: move SG pool code from SCSI driver to lib/sg_pool.c
2016-04-04 21:48 [PATCH v3 0/5] mempool based chained scatterlist alloc/free api Ming Lin
` (3 preceding siblings ...)
2016-04-04 21:48 ` [PATCH v3 4/5] scsi: rename SCSI_MAX_{SG, SG_CHAIN}_SEGMENTS Ming Lin
@ 2016-04-04 21:48 ` Ming Lin
2016-04-12 10:44 ` Sagi Grimberg
4 siblings, 1 reply; 18+ messages in thread
From: Ming Lin @ 2016-04-04 21:48 UTC (permalink / raw)
To: linux-kernel, linux-scsi; +Cc: Christoph Hellwig, Tejun Heo
From: Ming Lin <ming.l@ssi.samsung.com>
Now it's ready to move the mempool based SG chained allocator code from
SCSI driver to lib/sg_pool.c, which will be compiled only based on a Kconfig
symbol CONFIG_SG_POOL.
SCSI selects CONFIG_SG_POOL.
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ming Lin <ming.l@ssi.samsung.com>
---
drivers/scsi/Kconfig | 1 +
drivers/scsi/scsi_lib.c | 137 -----------------------------------
include/linux/scatterlist.h | 25 +++++++
include/scsi/scsi.h | 19 -----
lib/Kconfig | 7 ++
lib/Makefile | 1 +
lib/sg_pool.c | 172 ++++++++++++++++++++++++++++++++++++++++++++
7 files changed, 206 insertions(+), 156 deletions(-)
create mode 100644 lib/sg_pool.c
diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig
index 0950567..98e5d51 100644
--- a/drivers/scsi/Kconfig
+++ b/drivers/scsi/Kconfig
@@ -17,6 +17,7 @@ config SCSI
tristate "SCSI device support"
depends on BLOCK
select SCSI_DMA if HAS_DMA
+ select SG_POOL
---help---
If you want to use a SCSI hard disk, SCSI tape drive, SCSI CD-ROM or
any other SCSI device under Linux, say Y and make sure that you know
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 8f776f1..b920c5d 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -14,8 +14,6 @@
#include <linux/completion.h>
#include <linux/kernel.h>
#include <linux/export.h>
-#include <linux/mempool.h>
-#include <linux/slab.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/delay.h>
@@ -40,39 +38,6 @@
#include "scsi_logging.h"
-#define SG_MEMPOOL_NR ARRAY_SIZE(sg_pools)
-#define SG_MEMPOOL_SIZE 2
-
-struct sg_pool {
- size_t size;
- char *name;
- struct kmem_cache *slab;
- mempool_t *pool;
-};
-
-#define SP(x) { .size = x, "sgpool-" __stringify(x) }
-#if (SG_CHUNK_SIZE < 32)
-#error SG_CHUNK_SIZE is too small (must be 32 or greater)
-#endif
-static struct sg_pool sg_pools[] = {
- SP(8),
- SP(16),
-#if (SG_CHUNK_SIZE > 32)
- SP(32),
-#if (SG_CHUNK_SIZE > 64)
- SP(64),
-#if (SG_CHUNK_SIZE > 128)
- SP(128),
-#if (SG_CHUNK_SIZE > 256)
-#error SG_CHUNK_SIZE is too large (256 MAX)
-#endif
-#endif
-#endif
-#endif
- SP(SG_CHUNK_SIZE)
-};
-#undef SP
-
struct kmem_cache *scsi_sdb_cache;
/*
@@ -553,65 +518,6 @@ void scsi_run_host_queues(struct Scsi_Host *shost)
scsi_run_queue(sdev->request_queue);
}
-static inline unsigned int sg_pool_index(unsigned short nents)
-{
- unsigned int index;
-
- BUG_ON(nents > SG_CHUNK_SIZE);
-
- if (nents <= 8)
- index = 0;
- else
- index = get_count_order(nents) - 3;
-
- return index;
-}
-
-static void sg_pool_free(struct scatterlist *sgl, unsigned int nents)
-{
- struct sg_pool *sgp;
-
- sgp = sg_pools + sg_pool_index(nents);
- mempool_free(sgl, sgp->pool);
-}
-
-static struct scatterlist *sg_pool_alloc(unsigned int nents, gfp_t gfp_mask)
-{
- struct sg_pool *sgp;
-
- sgp = sg_pools + sg_pool_index(nents);
- return mempool_alloc(sgp->pool, gfp_mask);
-}
-
-static void sg_free_table_chained(struct sg_table *table, bool first_chunk)
-{
- if (first_chunk && table->orig_nents <= SG_CHUNK_SIZE)
- return;
- __sg_free_table(table, SG_CHUNK_SIZE, first_chunk, sg_pool_free);
-}
-
-static int sg_alloc_table_chained(struct sg_table *table, int nents,
- struct scatterlist *first_chunk)
-{
- int ret;
-
- BUG_ON(!nents);
-
- if (first_chunk) {
- if (nents <= SG_CHUNK_SIZE) {
- table->nents = table->orig_nents = nents;
- sg_init_table(table->sgl, nents);
- return 0;
- }
- }
-
- ret = __sg_alloc_table(table, nents, SG_CHUNK_SIZE,
- first_chunk, GFP_ATOMIC, sg_pool_alloc);
- if (unlikely(ret))
- sg_free_table_chained(table, (bool)first_chunk);
- return ret;
-}
-
static void scsi_uninit_cmd(struct scsi_cmnd *cmd)
{
if (cmd->request->cmd_type == REQ_TYPE_FS) {
@@ -2269,8 +2175,6 @@ EXPORT_SYMBOL(scsi_unblock_requests);
int __init scsi_init_queue(void)
{
- int i;
-
scsi_sdb_cache = kmem_cache_create("scsi_data_buffer",
sizeof(struct scsi_data_buffer),
0, 0, NULL);
@@ -2279,53 +2183,12 @@ int __init scsi_init_queue(void)
return -ENOMEM;
}
- for (i = 0; i < SG_MEMPOOL_NR; i++) {
- struct sg_pool *sgp = sg_pools + i;
- int size = sgp->size * sizeof(struct scatterlist);
-
- sgp->slab = kmem_cache_create(sgp->name, size, 0,
- SLAB_HWCACHE_ALIGN, NULL);
- if (!sgp->slab) {
- printk(KERN_ERR "SCSI: can't init sg slab %s\n",
- sgp->name);
- goto cleanup_sdb;
- }
-
- sgp->pool = mempool_create_slab_pool(SG_MEMPOOL_SIZE,
- sgp->slab);
- if (!sgp->pool) {
- printk(KERN_ERR "SCSI: can't init sg mempool %s\n",
- sgp->name);
- goto cleanup_sdb;
- }
- }
-
return 0;
-
-cleanup_sdb:
- for (i = 0; i < SG_MEMPOOL_NR; i++) {
- struct sg_pool *sgp = sg_pools + i;
- if (sgp->pool)
- mempool_destroy(sgp->pool);
- if (sgp->slab)
- kmem_cache_destroy(sgp->slab);
- }
- kmem_cache_destroy(scsi_sdb_cache);
-
- return -ENOMEM;
}
void scsi_exit_queue(void)
{
- int i;
-
kmem_cache_destroy(scsi_sdb_cache);
-
- for (i = 0; i < SG_MEMPOOL_NR; i++) {
- struct sg_pool *sgp = sg_pools + i;
- mempool_destroy(sgp->pool);
- kmem_cache_destroy(sgp->slab);
- }
}
/**
diff --git a/include/linux/scatterlist.h b/include/linux/scatterlist.h
index 556ec1e..cb3c8fe 100644
--- a/include/linux/scatterlist.h
+++ b/include/linux/scatterlist.h
@@ -286,6 +286,31 @@ size_t sg_pcopy_to_buffer(struct scatterlist *sgl, unsigned int nents,
#define SG_MAX_SINGLE_ALLOC (PAGE_SIZE / sizeof(struct scatterlist))
/*
+ * The maximum number of SG segments that we will put inside a
+ * scatterlist (unless chaining is used). Should ideally fit inside a
+ * single page, to avoid a higher order allocation. We could define this
+ * to SG_MAX_SINGLE_ALLOC to pack correctly at the highest order. The
+ * minimum value is 32
+ */
+#define SG_CHUNK_SIZE 128
+
+/*
+ * Like SG_CHUNK_SIZE, but for archs that have sg chaining. This limit
+ * is totally arbitrary, a setting of 2048 will get you at least 8mb ios.
+ */
+#ifdef CONFIG_ARCH_HAS_SG_CHAIN
+#define SG_MAX_SEGMENTS 2048
+#else
+#define SG_MAX_SEGMENTS SG_CHUNK_SIZE
+#endif
+
+#ifdef CONFIG_SG_POOL
+void sg_free_table_chained(struct sg_table *table, bool first_chunk);
+int sg_alloc_table_chained(struct sg_table *table, int nents,
+ struct scatterlist *first_chunk);
+#endif
+
+/*
* sg page iterator
*
* Iterates over sg entries page-by-page. On each successful iteration,
diff --git a/include/scsi/scsi.h b/include/scsi/scsi.h
index 74dafa7..8ec7c30 100644
--- a/include/scsi/scsi.h
+++ b/include/scsi/scsi.h
@@ -18,25 +18,6 @@ enum scsi_timeouts {
};
/*
- * The maximum number of SG segments that we will put inside a
- * scatterlist (unless chaining is used). Should ideally fit inside a
- * single page, to avoid a higher order allocation. We could define this
- * to SG_MAX_SINGLE_ALLOC to pack correctly at the highest order. The
- * minimum value is 32
- */
-#define SG_CHUNK_SIZE 128
-
-/*
- * Like SG_CHUNK_SIZE, but for archs that have sg chaining. This limit
- * is totally arbitrary, a setting of 2048 will get you at least 8mb ios.
- */
-#ifdef CONFIG_ARCH_HAS_SG_CHAIN
-#define SG_MAX_SEGMENTS 2048
-#else
-#define SG_MAX_SEGMENTS SG_CHUNK_SIZE
-#endif
-
-/*
* DIX-capable adapters effectively support infinite chaining for the
* protection information scatterlist
*/
diff --git a/lib/Kconfig b/lib/Kconfig
index 3cca122..61d55bd 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -523,6 +523,13 @@ config SG_SPLIT
a scatterlist. This should be selected by a driver or an API which
whishes to split a scatterlist amongst multiple DMA channels.
+config SG_POOL
+ def_bool n
+ help
+ Provides a helper to allocate chained scatterlists. This should be
+ selected by a driver or an API which whishes to allocate chained
+ scatterlist.
+
#
# sg chaining option
#
diff --git a/lib/Makefile b/lib/Makefile
index 7bd6fd4..bf01c26 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -178,6 +178,7 @@ obj-$(CONFIG_GENERIC_STRNLEN_USER) += strnlen_user.o
obj-$(CONFIG_GENERIC_NET_UTILS) += net_utils.o
obj-$(CONFIG_SG_SPLIT) += sg_split.o
+obj-$(CONFIG_SG_POOL) += sg_pool.o
obj-$(CONFIG_STMP_DEVICE) += stmp_device.o
obj-$(CONFIG_IRQ_POLL) += irq_poll.o
diff --git a/lib/sg_pool.c b/lib/sg_pool.c
new file mode 100644
index 0000000..6dd3061
--- /dev/null
+++ b/lib/sg_pool.c
@@ -0,0 +1,172 @@
+#include <linux/module.h>
+#include <linux/scatterlist.h>
+#include <linux/mempool.h>
+#include <linux/slab.h>
+
+#define SG_MEMPOOL_NR ARRAY_SIZE(sg_pools)
+#define SG_MEMPOOL_SIZE 2
+
+struct sg_pool {
+ size_t size;
+ char *name;
+ struct kmem_cache *slab;
+ mempool_t *pool;
+};
+
+#define SP(x) { .size = x, "sgpool-" __stringify(x) }
+#if (SG_CHUNK_SIZE < 32)
+#error SG_CHUNK_SIZE is too small (must be 32 or greater)
+#endif
+static struct sg_pool sg_pools[] = {
+ SP(8),
+ SP(16),
+#if (SG_CHUNK_SIZE > 32)
+ SP(32),
+#if (SG_CHUNK_SIZE > 64)
+ SP(64),
+#if (SG_CHUNK_SIZE > 128)
+ SP(128),
+#if (SG_CHUNK_SIZE > 256)
+#error SG_CHUNK_SIZE is too large (256 MAX)
+#endif
+#endif
+#endif
+#endif
+ SP(SG_CHUNK_SIZE)
+};
+#undef SP
+
+static inline unsigned int sg_pool_index(unsigned short nents)
+{
+ unsigned int index;
+
+ BUG_ON(nents > SG_CHUNK_SIZE);
+
+ if (nents <= 8)
+ index = 0;
+ else
+ index = get_count_order(nents) - 3;
+
+ return index;
+}
+
+static void sg_pool_free(struct scatterlist *sgl, unsigned int nents)
+{
+ struct sg_pool *sgp;
+
+ sgp = sg_pools + sg_pool_index(nents);
+ mempool_free(sgl, sgp->pool);
+}
+
+static struct scatterlist *sg_pool_alloc(unsigned int nents, gfp_t gfp_mask)
+{
+ struct sg_pool *sgp;
+
+ sgp = sg_pools + sg_pool_index(nents);
+ return mempool_alloc(sgp->pool, 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?
+ *
+ * Description:
+ * Free an sg table previously allocated and setup with
+ * sg_alloc_table_chained().
+ *
+ **/
+void sg_free_table_chained(struct sg_table *table, bool first_chunk)
+{
+ if (first_chunk && table->orig_nents <= SG_CHUNK_SIZE)
+ return;
+ __sg_free_table(table, SG_CHUNK_SIZE, first_chunk, sg_pool_free);
+}
+EXPORT_SYMBOL_GPL(sg_free_table_chained);
+
+/**
+ * sg_alloc_table_chained - Allocate and chain SGLs in an sg table
+ * @table: The sg table header to use
+ * @nents: Number of entries in sg list
+ * @first_chunk: first SGL
+ *
+ * Description:
+ * Allocate and chain SGLs in an sg table. If @nents@ is larger than
+ * SG_CHUNK_SIZE a chained sg table will be setup.
+ *
+ **/
+int sg_alloc_table_chained(struct sg_table *table, int nents,
+ struct scatterlist *first_chunk)
+{
+ int ret;
+
+ BUG_ON(!nents);
+
+ if (first_chunk) {
+ if (nents <= SG_CHUNK_SIZE) {
+ table->nents = table->orig_nents = nents;
+ sg_init_table(table->sgl, nents);
+ return 0;
+ }
+ }
+
+ ret = __sg_alloc_table(table, nents, SG_CHUNK_SIZE,
+ first_chunk, GFP_ATOMIC, sg_pool_alloc);
+ if (unlikely(ret))
+ sg_free_table_chained(table, (bool)first_chunk);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(sg_alloc_table_chained);
+
+static __init int sg_pool_init(void)
+{
+ int i;
+
+ for (i = 0; i < SG_MEMPOOL_NR; i++) {
+ struct sg_pool *sgp = sg_pools + i;
+ int size = sgp->size * sizeof(struct scatterlist);
+
+ sgp->slab = kmem_cache_create(sgp->name, size, 0,
+ SLAB_HWCACHE_ALIGN, NULL);
+ if (!sgp->slab) {
+ printk(KERN_ERR "SG_POOL: can't init sg slab %s\n",
+ sgp->name);
+ goto cleanup_sdb;
+ }
+
+ sgp->pool = mempool_create_slab_pool(SG_MEMPOOL_SIZE,
+ sgp->slab);
+ if (!sgp->pool) {
+ printk(KERN_ERR "SG_POOL: can't init sg mempool %s\n",
+ sgp->name);
+ goto cleanup_sdb;
+ }
+ }
+
+ return 0;
+
+cleanup_sdb:
+ for (i = 0; i < SG_MEMPOOL_NR; i++) {
+ struct sg_pool *sgp = sg_pools + i;
+ if (sgp->pool)
+ mempool_destroy(sgp->pool);
+ if (sgp->slab)
+ kmem_cache_destroy(sgp->slab);
+ }
+
+ return -ENOMEM;
+}
+
+static __exit void sg_pool_exit(void)
+{
+ int i;
+
+ for (i = 0; i < SG_MEMPOOL_NR; i++) {
+ struct sg_pool *sgp = sg_pools + i;
+ mempool_destroy(sgp->pool);
+ kmem_cache_destroy(sgp->slab);
+ }
+}
+
+module_init(sg_pool_init);
+module_exit(sg_pool_exit);
--
1.9.1
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