xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

FROMLIST: scsi: ufs: Limit the number of inflight rb

Browse Source 
in host control mode the host is the originator of map requests. To not
flood the device with map requests, use a simple throttling mechanism
that limits the number of inflight map requests.

Bug: 183467926
Bug: 170940265
Bug: 183454255

Link: https://lore.kernel.org/lkml/20210607061401.58884-10-avri.altman@wdc.com/
Signed-off-by: Avri Altman <avri.altman@wdc.com>
Change-Id: I75a5ced3be60569adcd75befa17d8a6340c147fd
This commit is contained in:
Avri Altman
2021-03-01 11:41:34 +02:00
committed by Todd Kjos
parent 76aa39a9f2
commit 5e463110fb
2 changed files with 12 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
drivers/scsi/ufs/ufshpb.c
View File

@@ -21,6 +21,7 @@
#define READ_TO_MS 1000
#define READ_TO_EXPIRIES 100
#define POLLING_INTERVAL_MS 200
#define THROTTLE_MAP_REQ_DEFAULT 1
/* memory management */
static struct kmem_cache *ufshpb_mctx_cache;
@@ -743,6 +744,14 @@ static struct ufshpb_req *ufshpb_get_map_req(struct ufshpb_lu *hpb,
struct ufshpb_req *map_req;
struct bio *bio;
if (hpb->is_hcm &&
hpb->num_inflight_map_req >= THROTTLE_MAP_REQ_DEFAULT) {
dev_info(&hpb->sdev_ufs_lu->sdev_dev,
"map_req throttle. inflight %d throttle %d",
hpb->num_inflight_map_req, THROTTLE_MAP_REQ_DEFAULT);
return NULL;
}
map_req = ufshpb_get_req(hpb, srgn->rgn_idx, REQ_OP_SCSI_IN, false);
if (!map_req)
return NULL;
@@ -757,6 +766,7 @@ static struct ufshpb_req *ufshpb_get_map_req(struct ufshpb_lu *hpb,
map_req->rb.srgn_idx = srgn->srgn_idx;
map_req->rb.mctx = srgn->mctx;
hpb->num_inflight_map_req++;
return map_req;
}
@@ -766,6 +776,7 @@ static void ufshpb_put_map_req(struct ufshpb_lu *hpb,
{
bio_put(map_req->bio);
ufshpb_put_req(hpb, map_req);
hpb->num_inflight_map_req--;
}
static int ufshpb_clear_dirty_bitmap(struct ufshpb_lu *hpb,

1
drivers/scsi/ufs/ufshpb.h
View File

@@ -217,6 +217,7 @@ struct ufshpb_lu {
struct ufshpb_req *pre_req;
int num_inflight_pre_req;
int throttle_pre_req;
int num_inflight_map_req;
struct list_head lh_pre_req_free;
int cur_read_id;
int pre_req_min_tr_len;