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lightnvm: pblk: expose max sec per write on sysfs

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Allow to configure the number of maximum sectors per write command
through sysfs. This makes it easier to tune write command sizes for
different controller configurations.

Signed-off-by: Javier González <javier@cnexlabs.com>
Signed-off-by: Matias Bjørling <matias@cnexlabs.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Javier González 2017-06-26 11:57:14 +02:00 committed by Jens Axboe
parent db7ada33cd
commit c2e9f5d457
4 changed files with 48 additions and 1 deletions
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7
drivers/lightnvm/pblk-core.c
View File

@ -397,6 +397,11 @@ void pblk_log_read_err(struct pblk *pblk, struct nvm_rq *rqd)
#endif
}
void pblk_set_sec_per_write(struct pblk *pblk, int sec_per_write)
{
pblk->sec_per_write = sec_per_write;
}
int pblk_submit_io(struct pblk *pblk, struct nvm_rq *rqd)
{
struct nvm_tgt_dev *dev = pblk->dev;
@ -478,7 +483,7 @@ struct bio *pblk_bio_map_addr(struct pblk *pblk, void *data,
int pblk_calc_secs(struct pblk *pblk, unsigned long secs_avail,
unsigned long secs_to_flush)
{
int max = pblk->max_write_pgs;
int max = pblk->sec_per_write;
int min = pblk->min_write_pgs;
int secs_to_sync = 0;

2
drivers/lightnvm/pblk-init.c
View File

@ -250,6 +250,8 @@ static int pblk_core_init(struct pblk *pblk)
pblk->pgs_in_buffer = NVM_MEM_PAGE_WRITE * geo->sec_per_pg *
geo->nr_planes * geo->nr_luns;
pblk_set_sec_per_write(pblk, pblk->min_write_pgs);
if (pblk->max_write_pgs > PBLK_MAX_REQ_ADDRS) {
pr_err("pblk: cannot support device max_phys_sect\n");
return -EINVAL;

38
drivers/lightnvm/pblk-sysfs.c
View File

@ -290,6 +290,11 @@ static ssize_t pblk_sysfs_lines_info(struct pblk *pblk, char *page)
return sz;
}
static ssize_t pblk_sysfs_get_sec_per_write(struct pblk *pblk, char *page)
{
return snprintf(page, PAGE_SIZE, "%d\n", pblk->sec_per_write);
}
#ifdef CONFIG_NVM_DEBUG
static ssize_t pblk_sysfs_stats_debug(struct pblk *pblk, char *page)
{
@ -354,6 +359,29 @@ static ssize_t pblk_sysfs_gc_force(struct pblk *pblk, const char *page,
return len;
}
static ssize_t pblk_sysfs_set_sec_per_write(struct pblk *pblk,
const char *page, size_t len)
{
size_t c_len;
int sec_per_write;
c_len = strcspn(page, "\n");
if (c_len >= len)
return -EINVAL;
if (kstrtouint(page, 0, &sec_per_write))
return -EINVAL;
if (sec_per_write < pblk->min_write_pgs
|| sec_per_write > pblk->max_write_pgs
|| sec_per_write % pblk->min_write_pgs != 0)
return -EINVAL;
pblk_set_sec_per_write(pblk, sec_per_write);
return len;
}
static struct attribute sys_write_luns = {
.name = "write_luns",
.mode = 0444,
@ -399,6 +427,11 @@ static struct attribute sys_gc_force = {
.mode = 0200,
};
static struct attribute sys_max_sec_per_write = {
.name = "max_sec_per_write",
.mode = 0644,
};
static struct attribute sys_gc_rl_max = {
.name = "gc_rl_max",
.mode = 0200,
@ -417,6 +450,7 @@ static struct attribute *pblk_attrs[] = {
&sys_errors_attr,
&sys_gc_state,
&sys_gc_force,
&sys_max_sec_per_write,
&sys_gc_rl_max,
&sys_rb_attr,
&sys_stats_ppaf_attr,
@ -449,6 +483,8 @@ static ssize_t pblk_sysfs_show(struct kobject *kobj, struct attribute *attr,
return pblk_sysfs_lines(pblk, buf);
else if (strcmp(attr->name, "lines_info") == 0)
return pblk_sysfs_lines_info(pblk, buf);
else if (strcmp(attr->name, "max_sec_per_write") == 0)
return pblk_sysfs_get_sec_per_write(pblk, buf);
#ifdef CONFIG_NVM_DEBUG
else if (strcmp(attr->name, "stats") == 0)
return pblk_sysfs_stats_debug(pblk, buf);
@ -465,6 +501,8 @@ static ssize_t pblk_sysfs_store(struct kobject *kobj, struct attribute *attr,
return pblk_sysfs_rate_store(pblk, buf, len);
else if (strcmp(attr->name, "gc_force") == 0)
return pblk_sysfs_gc_force(pblk, buf, len);
else if (strcmp(attr->name, "max_sec_per_write") == 0)
return pblk_sysfs_set_sec_per_write(pblk, buf, len);
return 0;
}

2
drivers/lightnvm/pblk.h
View File

@ -499,6 +499,7 @@ struct pblk {
/* pblk provisioning values. Used by rate limiter */
struct pblk_rl rl;
int sec_per_write;
struct semaphore erase_sem;
unsigned char instance_uuid[16];
@ -613,6 +614,7 @@ ssize_t pblk_rb_sysfs(struct pblk_rb *rb, char *buf);
* pblk core
*/
struct nvm_rq *pblk_alloc_rqd(struct pblk *pblk, int rw);
void pblk_set_sec_per_write(struct pblk *pblk, int sec_per_write);
int pblk_setup_w_rec_rq(struct pblk *pblk, struct nvm_rq *rqd,
struct pblk_c_ctx *c_ctx);
void pblk_free_rqd(struct pblk *pblk, struct nvm_rq *rqd, int rw);