[SCSI] don't use __GFP_DMA for sense buffers if not required
Only hosts which actually have ISA DMA requirements need sense buffers coming out of ZONE_DMA, so only use the __GFP_DMA flag for that case to avoid allocating this scarce resource if it's not necessary. [tomo: fixed slab leak in failure case] Acked-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
parent
de25deb180
commit
5b7f16804a
3 changed files with 51 additions and 71 deletions
|
@ -268,7 +268,6 @@ static void scsi_host_dev_release(struct device *dev)
|
||||||
}
|
}
|
||||||
|
|
||||||
scsi_destroy_command_freelist(shost);
|
scsi_destroy_command_freelist(shost);
|
||||||
scsi_destroy_command_sense_buffer(shost);
|
|
||||||
if (shost->bqt)
|
if (shost->bqt)
|
||||||
blk_free_tags(shost->bqt);
|
blk_free_tags(shost->bqt);
|
||||||
|
|
||||||
|
@ -373,13 +372,9 @@ struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize)
|
||||||
else
|
else
|
||||||
shost->dma_boundary = 0xffffffff;
|
shost->dma_boundary = 0xffffffff;
|
||||||
|
|
||||||
rval = scsi_setup_command_sense_buffer(shost);
|
|
||||||
if (rval)
|
|
||||||
goto fail_kfree;
|
|
||||||
|
|
||||||
rval = scsi_setup_command_freelist(shost);
|
rval = scsi_setup_command_freelist(shost);
|
||||||
if (rval)
|
if (rval)
|
||||||
goto fail_destroy_sense;
|
goto fail_kfree;
|
||||||
|
|
||||||
device_initialize(&shost->shost_gendev);
|
device_initialize(&shost->shost_gendev);
|
||||||
snprintf(shost->shost_gendev.bus_id, BUS_ID_SIZE, "host%d",
|
snprintf(shost->shost_gendev.bus_id, BUS_ID_SIZE, "host%d",
|
||||||
|
@ -404,8 +399,6 @@ struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize)
|
||||||
|
|
||||||
fail_destroy_freelist:
|
fail_destroy_freelist:
|
||||||
scsi_destroy_command_freelist(shost);
|
scsi_destroy_command_freelist(shost);
|
||||||
fail_destroy_sense:
|
|
||||||
scsi_destroy_command_sense_buffer(shost);
|
|
||||||
fail_kfree:
|
fail_kfree:
|
||||||
kfree(shost);
|
kfree(shost);
|
||||||
return NULL;
|
return NULL;
|
||||||
|
|
|
@ -141,29 +141,30 @@ const char * scsi_device_type(unsigned type)
|
||||||
EXPORT_SYMBOL(scsi_device_type);
|
EXPORT_SYMBOL(scsi_device_type);
|
||||||
|
|
||||||
struct scsi_host_cmd_pool {
|
struct scsi_host_cmd_pool {
|
||||||
struct kmem_cache *slab;
|
struct kmem_cache *cmd_slab;
|
||||||
unsigned int users;
|
struct kmem_cache *sense_slab;
|
||||||
char *name;
|
unsigned int users;
|
||||||
unsigned int slab_flags;
|
char *cmd_name;
|
||||||
gfp_t gfp_mask;
|
char *sense_name;
|
||||||
|
unsigned int slab_flags;
|
||||||
|
gfp_t gfp_mask;
|
||||||
};
|
};
|
||||||
|
|
||||||
static struct scsi_host_cmd_pool scsi_cmd_pool = {
|
static struct scsi_host_cmd_pool scsi_cmd_pool = {
|
||||||
.name = "scsi_cmd_cache",
|
.cmd_name = "scsi_cmd_cache",
|
||||||
|
.sense_name = "scsi_sense_cache",
|
||||||
.slab_flags = SLAB_HWCACHE_ALIGN,
|
.slab_flags = SLAB_HWCACHE_ALIGN,
|
||||||
};
|
};
|
||||||
|
|
||||||
static struct scsi_host_cmd_pool scsi_cmd_dma_pool = {
|
static struct scsi_host_cmd_pool scsi_cmd_dma_pool = {
|
||||||
.name = "scsi_cmd_cache(DMA)",
|
.cmd_name = "scsi_cmd_cache(DMA)",
|
||||||
|
.sense_name = "scsi_sense_cache(DMA)",
|
||||||
.slab_flags = SLAB_HWCACHE_ALIGN|SLAB_CACHE_DMA,
|
.slab_flags = SLAB_HWCACHE_ALIGN|SLAB_CACHE_DMA,
|
||||||
.gfp_mask = __GFP_DMA,
|
.gfp_mask = __GFP_DMA,
|
||||||
};
|
};
|
||||||
|
|
||||||
static DEFINE_MUTEX(host_cmd_pool_mutex);
|
static DEFINE_MUTEX(host_cmd_pool_mutex);
|
||||||
|
|
||||||
static struct kmem_cache *sense_buffer_slab;
|
|
||||||
static int sense_buffer_slab_users;
|
|
||||||
|
|
||||||
/**
|
/**
|
||||||
* __scsi_get_command - Allocate a struct scsi_cmnd
|
* __scsi_get_command - Allocate a struct scsi_cmnd
|
||||||
* @shost: host to transmit command
|
* @shost: host to transmit command
|
||||||
|
@ -177,8 +178,8 @@ struct scsi_cmnd *__scsi_get_command(struct Scsi_Host *shost, gfp_t gfp_mask)
|
||||||
struct scsi_cmnd *cmd;
|
struct scsi_cmnd *cmd;
|
||||||
unsigned char *buf;
|
unsigned char *buf;
|
||||||
|
|
||||||
cmd = kmem_cache_alloc(shost->cmd_pool->slab,
|
cmd = kmem_cache_alloc(shost->cmd_pool->cmd_slab,
|
||||||
gfp_mask | shost->cmd_pool->gfp_mask);
|
gfp_mask | shost->cmd_pool->gfp_mask);
|
||||||
|
|
||||||
if (unlikely(!cmd)) {
|
if (unlikely(!cmd)) {
|
||||||
unsigned long flags;
|
unsigned long flags;
|
||||||
|
@ -197,12 +198,13 @@ struct scsi_cmnd *__scsi_get_command(struct Scsi_Host *shost, gfp_t gfp_mask)
|
||||||
cmd->sense_buffer = buf;
|
cmd->sense_buffer = buf;
|
||||||
}
|
}
|
||||||
} else {
|
} else {
|
||||||
buf = kmem_cache_alloc(sense_buffer_slab, __GFP_DMA|gfp_mask);
|
buf = kmem_cache_alloc(shost->cmd_pool->sense_slab,
|
||||||
|
gfp_mask | shost->cmd_pool->gfp_mask);
|
||||||
if (likely(buf)) {
|
if (likely(buf)) {
|
||||||
memset(cmd, 0, sizeof(*cmd));
|
memset(cmd, 0, sizeof(*cmd));
|
||||||
cmd->sense_buffer = buf;
|
cmd->sense_buffer = buf;
|
||||||
} else {
|
} else {
|
||||||
kmem_cache_free(shost->cmd_pool->slab, cmd);
|
kmem_cache_free(shost->cmd_pool->cmd_slab, cmd);
|
||||||
cmd = NULL;
|
cmd = NULL;
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
|
@ -265,8 +267,9 @@ void __scsi_put_command(struct Scsi_Host *shost, struct scsi_cmnd *cmd,
|
||||||
spin_unlock_irqrestore(&shost->free_list_lock, flags);
|
spin_unlock_irqrestore(&shost->free_list_lock, flags);
|
||||||
|
|
||||||
if (likely(cmd != NULL)) {
|
if (likely(cmd != NULL)) {
|
||||||
kmem_cache_free(sense_buffer_slab, cmd->sense_buffer);
|
kmem_cache_free(shost->cmd_pool->sense_slab,
|
||||||
kmem_cache_free(shost->cmd_pool->slab, cmd);
|
cmd->sense_buffer);
|
||||||
|
kmem_cache_free(shost->cmd_pool->cmd_slab, cmd);
|
||||||
}
|
}
|
||||||
|
|
||||||
put_device(dev);
|
put_device(dev);
|
||||||
|
@ -310,7 +313,6 @@ int scsi_setup_command_freelist(struct Scsi_Host *shost)
|
||||||
{
|
{
|
||||||
struct scsi_host_cmd_pool *pool;
|
struct scsi_host_cmd_pool *pool;
|
||||||
struct scsi_cmnd *cmd;
|
struct scsi_cmnd *cmd;
|
||||||
unsigned char *sense_buffer;
|
|
||||||
|
|
||||||
spin_lock_init(&shost->free_list_lock);
|
spin_lock_init(&shost->free_list_lock);
|
||||||
INIT_LIST_HEAD(&shost->free_list);
|
INIT_LIST_HEAD(&shost->free_list);
|
||||||
|
@ -322,11 +324,19 @@ int scsi_setup_command_freelist(struct Scsi_Host *shost)
|
||||||
mutex_lock(&host_cmd_pool_mutex);
|
mutex_lock(&host_cmd_pool_mutex);
|
||||||
pool = (shost->unchecked_isa_dma ? &scsi_cmd_dma_pool : &scsi_cmd_pool);
|
pool = (shost->unchecked_isa_dma ? &scsi_cmd_dma_pool : &scsi_cmd_pool);
|
||||||
if (!pool->users) {
|
if (!pool->users) {
|
||||||
pool->slab = kmem_cache_create(pool->name,
|
pool->cmd_slab = kmem_cache_create(pool->cmd_name,
|
||||||
sizeof(struct scsi_cmnd), 0,
|
sizeof(struct scsi_cmnd), 0,
|
||||||
pool->slab_flags, NULL);
|
pool->slab_flags, NULL);
|
||||||
if (!pool->slab)
|
if (!pool->cmd_slab)
|
||||||
goto fail;
|
goto fail;
|
||||||
|
|
||||||
|
pool->sense_slab = kmem_cache_create(pool->sense_name,
|
||||||
|
SCSI_SENSE_BUFFERSIZE, 0,
|
||||||
|
pool->slab_flags, NULL);
|
||||||
|
if (!pool->sense_slab) {
|
||||||
|
kmem_cache_destroy(pool->cmd_slab);
|
||||||
|
goto fail;
|
||||||
|
}
|
||||||
}
|
}
|
||||||
|
|
||||||
pool->users++;
|
pool->users++;
|
||||||
|
@ -336,26 +346,28 @@ int scsi_setup_command_freelist(struct Scsi_Host *shost)
|
||||||
/*
|
/*
|
||||||
* Get one backup command for this host.
|
* Get one backup command for this host.
|
||||||
*/
|
*/
|
||||||
cmd = kmem_cache_alloc(shost->cmd_pool->slab,
|
cmd = kmem_cache_alloc(shost->cmd_pool->cmd_slab,
|
||||||
GFP_KERNEL | shost->cmd_pool->gfp_mask);
|
GFP_KERNEL | shost->cmd_pool->gfp_mask);
|
||||||
if (!cmd)
|
if (!cmd)
|
||||||
goto fail2;
|
goto fail2;
|
||||||
|
|
||||||
sense_buffer = kmem_cache_alloc(sense_buffer_slab,
|
cmd->sense_buffer = kmem_cache_alloc(shost->cmd_pool->sense_slab,
|
||||||
GFP_KERNEL | __GFP_DMA);
|
GFP_KERNEL |
|
||||||
if (!sense_buffer)
|
shost->cmd_pool->gfp_mask);
|
||||||
goto destroy_backup;
|
if (!cmd->sense_buffer)
|
||||||
|
goto fail2;
|
||||||
|
|
||||||
cmd->sense_buffer = sense_buffer;
|
|
||||||
list_add(&cmd->list, &shost->free_list);
|
list_add(&cmd->list, &shost->free_list);
|
||||||
return 0;
|
return 0;
|
||||||
|
|
||||||
destroy_backup:
|
|
||||||
kmem_cache_free(shost->cmd_pool->slab, cmd);
|
|
||||||
fail2:
|
fail2:
|
||||||
|
if (cmd)
|
||||||
|
kmem_cache_free(shost->cmd_pool->cmd_slab, cmd);
|
||||||
mutex_lock(&host_cmd_pool_mutex);
|
mutex_lock(&host_cmd_pool_mutex);
|
||||||
if (!--pool->users)
|
if (!--pool->users) {
|
||||||
kmem_cache_destroy(pool->slab);
|
kmem_cache_destroy(pool->cmd_slab);
|
||||||
|
kmem_cache_destroy(pool->sense_slab);
|
||||||
|
}
|
||||||
fail:
|
fail:
|
||||||
mutex_unlock(&host_cmd_pool_mutex);
|
mutex_unlock(&host_cmd_pool_mutex);
|
||||||
return -ENOMEM;
|
return -ENOMEM;
|
||||||
|
@ -372,39 +384,16 @@ void scsi_destroy_command_freelist(struct Scsi_Host *shost)
|
||||||
|
|
||||||
cmd = list_entry(shost->free_list.next, struct scsi_cmnd, list);
|
cmd = list_entry(shost->free_list.next, struct scsi_cmnd, list);
|
||||||
list_del_init(&cmd->list);
|
list_del_init(&cmd->list);
|
||||||
kmem_cache_free(sense_buffer_slab, cmd->sense_buffer);
|
kmem_cache_free(shost->cmd_pool->sense_slab,
|
||||||
kmem_cache_free(shost->cmd_pool->slab, cmd);
|
cmd->sense_buffer);
|
||||||
|
kmem_cache_free(shost->cmd_pool->cmd_slab, cmd);
|
||||||
}
|
}
|
||||||
|
|
||||||
mutex_lock(&host_cmd_pool_mutex);
|
mutex_lock(&host_cmd_pool_mutex);
|
||||||
if (!--shost->cmd_pool->users)
|
if (!--shost->cmd_pool->users) {
|
||||||
kmem_cache_destroy(shost->cmd_pool->slab);
|
kmem_cache_destroy(shost->cmd_pool->cmd_slab);
|
||||||
mutex_unlock(&host_cmd_pool_mutex);
|
kmem_cache_destroy(shost->cmd_pool->sense_slab);
|
||||||
}
|
|
||||||
|
|
||||||
int scsi_setup_command_sense_buffer(struct Scsi_Host *shost)
|
|
||||||
{
|
|
||||||
mutex_lock(&host_cmd_pool_mutex);
|
|
||||||
if (!sense_buffer_slab_users) {
|
|
||||||
sense_buffer_slab = kmem_cache_create("scsi_sense_buffer",
|
|
||||||
SCSI_SENSE_BUFFERSIZE,
|
|
||||||
0, SLAB_CACHE_DMA, NULL);
|
|
||||||
if (!sense_buffer_slab) {
|
|
||||||
mutex_unlock(&host_cmd_pool_mutex);
|
|
||||||
return -ENOMEM;
|
|
||||||
}
|
|
||||||
}
|
}
|
||||||
sense_buffer_slab_users++;
|
|
||||||
mutex_unlock(&host_cmd_pool_mutex);
|
|
||||||
|
|
||||||
return 0;
|
|
||||||
}
|
|
||||||
|
|
||||||
void scsi_destroy_command_sense_buffer(struct Scsi_Host *shost)
|
|
||||||
{
|
|
||||||
mutex_lock(&host_cmd_pool_mutex);
|
|
||||||
if (!--sense_buffer_slab_users)
|
|
||||||
kmem_cache_destroy(sense_buffer_slab);
|
|
||||||
mutex_unlock(&host_cmd_pool_mutex);
|
mutex_unlock(&host_cmd_pool_mutex);
|
||||||
}
|
}
|
||||||
|
|
||||||
|
|
|
@ -27,8 +27,6 @@ extern void scsi_exit_hosts(void);
|
||||||
extern int scsi_dispatch_cmd(struct scsi_cmnd *cmd);
|
extern int scsi_dispatch_cmd(struct scsi_cmnd *cmd);
|
||||||
extern int scsi_setup_command_freelist(struct Scsi_Host *shost);
|
extern int scsi_setup_command_freelist(struct Scsi_Host *shost);
|
||||||
extern void scsi_destroy_command_freelist(struct Scsi_Host *shost);
|
extern void scsi_destroy_command_freelist(struct Scsi_Host *shost);
|
||||||
extern int scsi_setup_command_sense_buffer(struct Scsi_Host *shost);
|
|
||||||
extern void scsi_destroy_command_sense_buffer(struct Scsi_Host *shost);
|
|
||||||
extern void __scsi_done(struct scsi_cmnd *cmd);
|
extern void __scsi_done(struct scsi_cmnd *cmd);
|
||||||
#ifdef CONFIG_SCSI_LOGGING
|
#ifdef CONFIG_SCSI_LOGGING
|
||||||
void scsi_log_send(struct scsi_cmnd *cmd);
|
void scsi_log_send(struct scsi_cmnd *cmd);
|
||||||
|
|
Loading…
Reference in a new issue