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FROMLIST: scsi: ufs: Eviction in HCM

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In host mode, eviction is considered an extreme measure.
verify that the entering region has enough reads, and the exiting
region has much less reads.

Bug: 183467926
Bug: 170940265
Bug: 183454255

Link: https://lore.kernel.org/lkml/20210607061401.58884-6-avri.altman@wdc.com/
Signed-off-by: Avri Altman <avri.altman@wdc.com>
Change-Id: Ia08e3af69302c4f0474efa7c616832dde48df4e0
This commit is contained in:
Avri Altman
2020-06-30 13:13:02 +03:00
committed by Todd Kjos
parent a782d4350f
commit d5b978446c
1 changed files with 17 additions and 1 deletions
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18
drivers/scsi/ufs/ufshpb.c
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@@ -17,6 +17,7 @@
#include "../sd.h"
#define ACTIVATION_THRESHOLD 8 /* 8 IOs */
#define EVICTION_THRESHOLD (ACTIVATION_THRESHOLD << 5) /* 256 IOs */
/* memory management */
static struct kmem_cache *ufshpb_mctx_cache;
@@ -1057,6 +1058,13 @@ static struct ufshpb_region *ufshpb_victim_lru_info(struct ufshpb_lu *hpb)
if (ufshpb_check_srgns_issue_state(hpb, rgn))
continue;
/*
* in host control mode, verify that the exiting region
* has less reads
*/
if (hpb->is_hcm && rgn->reads > (EVICTION_THRESHOLD >> 1))
continue;
victim_rgn = rgn;
break;
}
@@ -1223,7 +1231,7 @@ unlock_out:
static int ufshpb_add_region(struct ufshpb_lu *hpb, struct ufshpb_region *rgn)
{
struct ufshpb_region *victim_rgn;
struct ufshpb_region *victim_rgn = NULL;
struct victim_select_info *lru_info = &hpb->lru_info;
unsigned long flags;
int ret = 0;
@@ -1250,7 +1258,15 @@ static int ufshpb_add_region(struct ufshpb_lu *hpb, struct ufshpb_region *rgn)
* It is okay to evict the least recently used region,
* because the device could detect this region
* by not issuing HPB_READ
*
* in host control mode, verify that the entering
* region has enough reads
*/
if (hpb->is_hcm && rgn->reads < EVICTION_THRESHOLD) {
ret = -EACCES;
goto out;
}
victim_rgn = ufshpb_victim_lru_info(hpb);
if (!victim_rgn) {
dev_warn(&hpb->sdev_ufs_lu->sdev_dev,