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>
---
v2: Changed according to Javier's comments.
Remove unneccessary comment and move the definition of bqueue to
maintain ordering.
drivers/lightnvm/pblk-init.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/lightnvm/pblk-init.c b/drivers/lightnvm/pblk-init.c
index e357388..0ef9ac5 100644
--- a/drivers/lightnvm/pblk-init.c
+++ b/drivers/lightnvm/pblk-init.c
@@ -391,6 +391,7 @@ static void pblk_put_global_caches(void)
static int pblk_core_init(struct pblk *pblk)
{
struct nvm_tgt_dev *dev = pblk->dev;
+ struct request_queue *bqueue = dev->q;
struct nvm_geo *geo = &dev->geo;
int ret, max_write_ppas;
@@ -407,6 +408,8 @@ 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);
+ 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
