From c2e9f5d457ad6a75516e749a3e544165766ab1ce Mon Sep 17 00:00:00 2001 From: =?utf8?q?Javier=20Gonz=C3=A1lez?= Date: Mon, 26 Jun 2017 11:57:14 +0200 Subject: [PATCH] lightnvm: pblk: expose max sec per write on sysfs MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Signed-off-by: Matias Bjørling Signed-off-by: Jens Axboe --- drivers/lightnvm/pblk-core.c | 7 ++++++- drivers/lightnvm/pblk-init.c | 2 ++ drivers/lightnvm/pblk-sysfs.c | 38 +++++++++++++++++++++++++++++++++++ drivers/lightnvm/pblk.h | 2 ++ 4 files changed, 48 insertions(+), 1 deletion(-) diff --git a/drivers/lightnvm/pblk-core.c b/drivers/lightnvm/pblk-core.c index 4e0de995cd90..567ed5aa5a0f 100644 --- a/drivers/lightnvm/pblk-core.c +++ b/drivers/lightnvm/pblk-core.c @@ -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 @@ out: 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; diff --git a/drivers/lightnvm/pblk-init.c b/drivers/lightnvm/pblk-init.c index 2d79336748ee..0389068c60cb 100644 --- a/drivers/lightnvm/pblk-init.c +++ b/drivers/lightnvm/pblk-init.c @@ -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; diff --git a/drivers/lightnvm/pblk-sysfs.c b/drivers/lightnvm/pblk-sysfs.c index 3c1a586c09a2..bf8fc6699299 100644 --- a/drivers/lightnvm/pblk-sysfs.c +++ b/drivers/lightnvm/pblk-sysfs.c @@ -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; } diff --git a/drivers/lightnvm/pblk.h b/drivers/lightnvm/pblk.h index 77ee42a3f514..edff59aae741 100644 --- a/drivers/lightnvm/pblk.h +++ b/drivers/lightnvm/pblk.h @@ -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); -- 2.20.1