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scsi: ufs: ufshpb: Add "cold" regions timer

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In order not to hang on to "cold" regions, we inactivate a region that has
had no READ access for a predefined amount of time - READ_TO_MS. For that
purpose monitor the active regions list, polling it on every
POLLING_INTERVAL_MS. On timeout expiry add the region to the
"to-be-inactivated" list unless it is clean and did not exhaust its
READ_TO_EXPIRIES - another parameter.

None of this applies to pinned regions.

Link: https://lore.kernel.org/r/20210712095039.8093-9-avri.altman@wdc.com
Reviewed-by: Daejun Park <daejun7.park@samsung.com>
Signed-off-by: Avri Altman <avri.altman@wdc.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Avri Altman 2021-07-12 12:50:35 +03:00 committed by Martin K. Petersen
parent 67001ff171
commit 13c044e916
2 changed files with 79 additions and 3 deletions
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74
drivers/scsi/ufs/ufshpb.c
View file

@ -18,6 +18,9 @@
#define ACTIVATION_THRESHOLD 8 /* 8 IOs */
#define EVICTION_THRESHOLD (ACTIVATION_THRESHOLD << 5) /* 256 IOs */
#define READ_TO_MS 1000
#define READ_TO_EXPIRIES 100
#define POLLING_INTERVAL_MS 200
/* memory management */
static struct kmem_cache *ufshpb_mctx_cache;
@ -1032,12 +1035,63 @@ static int ufshpb_check_srgns_issue_state(struct ufshpb_lu *hpb,
return 0;
}
static void ufshpb_read_to_handler(struct work_struct *work)
{
struct ufshpb_lu *hpb = container_of(work, struct ufshpb_lu,
ufshpb_read_to_work.work);
struct victim_select_info *lru_info = &hpb->lru_info;
struct ufshpb_region *rgn, *next_rgn;
unsigned long flags;
LIST_HEAD(expired_list);
if (test_and_set_bit(TIMEOUT_WORK_RUNNING, &hpb->work_data_bits))
return;
spin_lock_irqsave(&hpb->rgn_state_lock, flags);
list_for_each_entry_safe(rgn, next_rgn, &lru_info->lh_lru_rgn,
list_lru_rgn) {
bool timedout = ktime_after(ktime_get(), rgn->read_timeout);
if (timedout) {
rgn->read_timeout_expiries--;
if (is_rgn_dirty(rgn) ||
rgn->read_timeout_expiries == 0)
list_add(&rgn->list_expired_rgn, &expired_list);
else
rgn->read_timeout = ktime_add_ms(ktime_get(),
READ_TO_MS);
}
}
spin_unlock_irqrestore(&hpb->rgn_state_lock, flags);
list_for_each_entry_safe(rgn, next_rgn, &expired_list,
list_expired_rgn) {
list_del_init(&rgn->list_expired_rgn);
spin_lock_irqsave(&hpb->rsp_list_lock, flags);
ufshpb_update_inactive_info(hpb, rgn->rgn_idx);
spin_unlock_irqrestore(&hpb->rsp_list_lock, flags);
}
ufshpb_kick_map_work(hpb);
clear_bit(TIMEOUT_WORK_RUNNING, &hpb->work_data_bits);
schedule_delayed_work(&hpb->ufshpb_read_to_work,
msecs_to_jiffies(POLLING_INTERVAL_MS));
}
static void ufshpb_add_lru_info(struct victim_select_info *lru_info,
struct ufshpb_region *rgn)
{
rgn->rgn_state = HPB_RGN_ACTIVE;
list_add_tail(&rgn->list_lru_rgn, &lru_info->lh_lru_rgn);
atomic_inc(&lru_info->active_cnt);
if (rgn->hpb->is_hcm) {
rgn->read_timeout = ktime_add_ms(ktime_get(), READ_TO_MS);
rgn->read_timeout_expiries = READ_TO_EXPIRIES;
}
}
static void ufshpb_hit_lru_info(struct victim_select_info *lru_info,
@ -1819,6 +1873,7 @@ static int ufshpb_alloc_region_tbl(struct ufs_hba *hba, struct ufshpb_lu *hpb)
INIT_LIST_HEAD(&rgn->list_inact_rgn);
INIT_LIST_HEAD(&rgn->list_lru_rgn);
INIT_LIST_HEAD(&rgn->list_expired_rgn);
if (rgn_idx == hpb->rgns_per_lu - 1) {
srgn_cnt = ((hpb->srgns_per_lu - 1) %
@ -1840,6 +1895,7 @@ static int ufshpb_alloc_region_tbl(struct ufs_hba *hba, struct ufshpb_lu *hpb)
}
rgn->rgn_flags = 0;
rgn->hpb = hpb;
}
return 0;
@ -2063,9 +2119,12 @@ static int ufshpb_lu_hpb_init(struct ufs_hba *hba, struct ufshpb_lu *hpb)
INIT_LIST_HEAD(&hpb->list_hpb_lu);
INIT_WORK(&hpb->map_work, ufshpb_map_work_handler);
if (hpb->is_hcm)
if (hpb->is_hcm) {
INIT_WORK(&hpb->ufshpb_normalization_work,
ufshpb_normalization_work_handler);
INIT_DELAYED_WORK(&hpb->ufshpb_read_to_work,
ufshpb_read_to_handler);
}
hpb->map_req_cache = kmem_cache_create("ufshpb_req_cache",
sizeof(struct ufshpb_req), 0, 0, NULL);
@ -2099,6 +2158,10 @@ static int ufshpb_lu_hpb_init(struct ufs_hba *hba, struct ufshpb_lu *hpb)
ufshpb_stat_init(hpb);
ufshpb_param_init(hpb);
if (hpb->is_hcm)
schedule_delayed_work(&hpb->ufshpb_read_to_work,
msecs_to_jiffies(POLLING_INTERVAL_MS));
return 0;
release_pre_req_mempool:
@ -2165,9 +2228,10 @@ static void ufshpb_discard_rsp_lists(struct ufshpb_lu *hpb)
static void ufshpb_cancel_jobs(struct ufshpb_lu *hpb)
{
if (hpb->is_hcm)
if (hpb->is_hcm) {
cancel_delayed_work_sync(&hpb->ufshpb_read_to_work);
cancel_work_sync(&hpb->ufshpb_normalization_work);
}
cancel_work_sync(&hpb->map_work);
}
@ -2275,6 +2339,10 @@ void ufshpb_resume(struct ufs_hba *hba)
continue;
ufshpb_set_state(hpb, HPB_PRESENT);
ufshpb_kick_map_work(hpb);
if (hpb->is_hcm)
schedule_delayed_work(&hpb->ufshpb_read_to_work,
msecs_to_jiffies(POLLING_INTERVAL_MS));
}
}

8
drivers/scsi/ufs/ufshpb.h
View file

@ -115,6 +115,7 @@ struct ufshpb_subregion {
};
struct ufshpb_region {
struct ufshpb_lu *hpb;
struct ufshpb_subregion *srgn_tbl;
enum HPB_RGN_STATE rgn_state;
int rgn_idx;
@ -132,6 +133,10 @@ struct ufshpb_region {
/* region reads - for host mode */
spinlock_t rgn_lock;
unsigned int reads;
/* region "cold" timer - for host mode */
ktime_t read_timeout;
unsigned int read_timeout_expiries;
struct list_head list_expired_rgn;
};
#define for_each_sub_region(rgn, i, srgn) \
@ -223,6 +228,9 @@ struct ufshpb_lu {
/* for selecting victim */
struct victim_select_info lru_info;
struct work_struct ufshpb_normalization_work;
struct delayed_work ufshpb_read_to_work;
unsigned long work_data_bits;
#define TIMEOUT_WORK_RUNNING 0
/* pinned region information */
u32 lu_pinned_start;