mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
synced 2024-12-28 16:52:18 +00:00
lib: scatterlist: move SG pool code from SCSI driver to lib/sg_pool.c
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> Reviewed-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Ming Lin
Martin K. Petersen
parent
65e8617fba
commit
9b1d6c8950
@ -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
|
||||
|
||||
@ -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);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
|
||||
@ -285,6 +285,31 @@ 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
|
||||
*
|
||||
|
||||
@ -17,25 +17,6 @@ enum scsi_timeouts {
|
||||
SCSI_DEFAULT_EH_TIMEOUT = 10 * HZ,
|
||||
};
|
||||
|
||||
/*
|
||||
* 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
|
||||
|
||||
@ -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
|
||||
#
|
||||
|
||||
@ -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
|
||||
|
||||
|
||||
172
lib/sg_pool.c
Normal file
172
lib/sg_pool.c
Normal file
@ -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);
|
||||
Loading…
Reference in New Issue
Block a user