When do GC, the number of read/write sectors are determined by max_write_pgs(see gc_rq preparation in pblk_gc_line_prepare_ws). Due to max_write_pgs doesn't consider max hw sectors supported by nvme controller(128K), which leads to GC tries to read 64 * 4K in one command, and see below error caused by pblk_bio_map_addr in function pblk_submit_read_gc. [ 2923.005376] pblk: could not add page to bio [ 2923.005377] pblk: could not allocate GC bio (18446744073709551604) Signed-off-by: Zhoujie Wu <zjwu@xxxxxxxxxxx> --- drivers/lightnvm/pblk-init.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/lightnvm/pblk-init.c b/drivers/lightnvm/pblk-init.c index e357388..2e51875 100644 --- a/drivers/lightnvm/pblk-init.c +++ b/drivers/lightnvm/pblk-init.c @@ -393,6 +393,7 @@ static int pblk_core_init(struct pblk *pblk) struct nvm_tgt_dev *dev = pblk->dev; struct nvm_geo *geo = &dev->geo; int ret, max_write_ppas; + struct request_queue *bqueue = dev->q; atomic64_set(&pblk->user_wa, 0); atomic64_set(&pblk->pad_wa, 0); @@ -407,6 +408,9 @@ static int pblk_core_init(struct pblk *pblk) pblk->min_write_pgs = geo->ws_opt; max_write_ppas = pblk->min_write_pgs * geo->all_luns; pblk->max_write_pgs = min_t(int, max_write_ppas, NVM_MAX_VLBA); + /* consider the max hw sector as well */ + pblk->max_write_pgs = min_t(int, pblk->max_write_pgs, + queue_max_hw_sectors(bqueue) / (geo->csecs >> 9)); pblk_set_sec_per_write(pblk, pblk->min_write_pgs); pblk->pad_dist = kcalloc(pblk->min_write_pgs - 1, sizeof(atomic64_t), -- 1.9.1
