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Date: Mon, 15 Mar 2021 17:31:10 +0800
From: Can Guo <cang@...eaurora.org>
To: Avri Altman <Avri.Altman@....com>
Cc: "James E . J . Bottomley" <jejb@...ux.vnet.ibm.com>,
"Martin K . Petersen" <martin.petersen@...cle.com>,
linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
gregkh@...uxfoundation.org, Bart Van Assche <bvanassche@....org>,
yongmyung lee <ymhungry.lee@...sung.com>,
Daejun Park <daejun7.park@...sung.com>,
alim.akhtar@...sung.com, asutoshd@...eaurora.org,
Zang Leigang <zangleigang@...ilicon.com>,
Avi Shchislowski <Avi.Shchislowski@....com>,
Bean Huo <beanhuo@...ron.com>, stanley.chu@...iatek.com
Subject: Re: [PATCH v5 03/10] scsi: ufshpb: Add region's reads counter
On 2021-03-15 17:20, Avri Altman wrote:
>> > +
>> > + if (hpb->is_hcm) {
>> > + spin_lock_irqsave(&rgn->rgn_lock, flags);
>>
>> rgn_lock is never used in IRQ contexts, so no need of irqsave and
>> irqrestore everywhere, which can impact performance. Please correct
>> me if I am wrong.
> Thanks. Will do.
>
>>
>> Meanwhile, have you ever initialized the rgn_lock before use it???
> Yep - forgot to do that here (but not in gs20 and mi10). Thanks.
You mean you didn't test this specific series before upload?
I haven't moved to the test stage, but this will definitely
cause you error...
Can Guo.
>
> Thanks,
> Avri
>
>>
>> Thanks,
>> Can Guo.
>>
>> > + rgn->reads = 0;
>> > + spin_unlock_irqrestore(&rgn->rgn_lock, flags);
>> > + }
>> > +
>> > return 0;
>> > }
>> >
>> > if (!ufshpb_is_support_chunk(hpb, transfer_len))
>> > return 0;
>> >
>> > + if (hpb->is_hcm) {
>> > + bool activate = false;
>> > + /*
>> > + * in host control mode, reads are the main source for
>> > + * activation trials.
>> > + */
>> > + spin_lock_irqsave(&rgn->rgn_lock, flags);
>> > + rgn->reads++;
>> > + if (rgn->reads == ACTIVATION_THRESHOLD)
>> > + activate = true;
>> > + spin_unlock_irqrestore(&rgn->rgn_lock, flags);
>> > + if (activate) {
>> > + spin_lock_irqsave(&hpb->rsp_list_lock, flags);
>> > + ufshpb_update_active_info(hpb, rgn_idx, srgn_idx);
>> > + hpb->stats.rb_active_cnt++;
>> > + spin_unlock_irqrestore(&hpb->rsp_list_lock, flags);
>> > + dev_dbg(&hpb->sdev_ufs_lu->sdev_dev,
>> > + "activate region %d-%d\n", rgn_idx, srgn_idx);
>> > + }
>> > +
>> > + /* keep those counters normalized */
>> > + if (rgn->reads > hpb->entries_per_srgn)
>> > + schedule_work(&hpb->ufshpb_normalization_work);
>> > + }
>> > +
>> > spin_lock_irqsave(&hpb->rgn_state_lock, flags);
>> > if (ufshpb_test_ppn_dirty(hpb, rgn_idx, srgn_idx, srgn_offset,
>> > transfer_len)) {
>> > @@ -745,21 +794,6 @@ static int ufshpb_clear_dirty_bitmap(struct
>> > ufshpb_lu *hpb,
>> > return 0;
>> > }
>> >
>> > -static void ufshpb_update_active_info(struct ufshpb_lu *hpb, int
>> > rgn_idx,
>> > - int srgn_idx)
>> > -{
>> > - struct ufshpb_region *rgn;
>> > - struct ufshpb_subregion *srgn;
>> > -
>> > - rgn = hpb->rgn_tbl + rgn_idx;
>> > - srgn = rgn->srgn_tbl + srgn_idx;
>> > -
>> > - list_del_init(&rgn->list_inact_rgn);
>> > -
>> > - if (list_empty(&srgn->list_act_srgn))
>> > - list_add_tail(&srgn->list_act_srgn, &hpb->lh_act_srgn);
>> > -}
>> > -
>> > static void ufshpb_update_inactive_info(struct ufshpb_lu *hpb, int
>> > rgn_idx)
>> > {
>> > struct ufshpb_region *rgn;
>> > @@ -1079,6 +1113,14 @@ static void __ufshpb_evict_region(struct
>> > ufshpb_lu *hpb,
>> >
>> > ufshpb_cleanup_lru_info(lru_info, rgn);
>> >
>> > + if (hpb->is_hcm) {
>> > + unsigned long flags;
>> > +
>> > + spin_lock_irqsave(&rgn->rgn_lock, flags);
>> > + rgn->reads = 0;
>> > + spin_unlock_irqrestore(&rgn->rgn_lock, flags);
>> > + }
>> > +
>> > for_each_sub_region(rgn, srgn_idx, srgn)
>> > ufshpb_purge_active_subregion(hpb, srgn);
>> > }
>> > @@ -1523,6 +1565,31 @@ static void
>> > ufshpb_run_inactive_region_list(struct ufshpb_lu *hpb)
>> > spin_unlock_irqrestore(&hpb->rsp_list_lock, flags);
>> > }
>> >
>> > +static void ufshpb_normalization_work_handler(struct work_struct
>> > *work)
>> > +{
>> > + struct ufshpb_lu *hpb;
>> > + int rgn_idx;
>> > + unsigned long flags;
>> > +
>> > + hpb = container_of(work, struct ufshpb_lu,
>> > ufshpb_normalization_work);
>> > +
>> > + for (rgn_idx = 0; rgn_idx < hpb->rgns_per_lu; rgn_idx++) {
>> > + struct ufshpb_region *rgn = hpb->rgn_tbl + rgn_idx;
>> > +
>> > + spin_lock_irqsave(&rgn->rgn_lock, flags);
>> > + rgn->reads = (rgn->reads >> 1);
>> > + spin_unlock_irqrestore(&rgn->rgn_lock, flags);
>> > +
>> > + if (rgn->rgn_state != HPB_RGN_ACTIVE || rgn->reads)
>> > + continue;
>> > +
>> > + /* if region is active but has no reads - inactivate it */
>> > + spin_lock(&hpb->rsp_list_lock);
>> > + ufshpb_update_inactive_info(hpb, rgn->rgn_idx);
>> > + spin_unlock(&hpb->rsp_list_lock);
>> > + }
>> > +}
>> > +
>> > static void ufshpb_map_work_handler(struct work_struct *work)
>> > {
>> > struct ufshpb_lu *hpb = container_of(work, struct ufshpb_lu,
>> > map_work);
>> > @@ -1913,6 +1980,9 @@ 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)
>> > + INIT_WORK(&hpb->ufshpb_normalization_work,
>> > + ufshpb_normalization_work_handler);
>> >
>> > hpb->map_req_cache = kmem_cache_create("ufshpb_req_cache",
>> > sizeof(struct ufshpb_req), 0, 0, NULL);
>> > @@ -2012,6 +2082,8 @@ static void ufshpb_discard_rsp_lists(struct
>> > ufshpb_lu *hpb)
>> >
>> > static void ufshpb_cancel_jobs(struct ufshpb_lu *hpb)
>> > {
>> > + if (hpb->is_hcm)
>> > + cancel_work_sync(&hpb->ufshpb_normalization_work);
>> > cancel_work_sync(&hpb->map_work);
>> > }
>> >
>> > diff --git a/drivers/scsi/ufs/ufshpb.h b/drivers/scsi/ufs/ufshpb.h
>> > index 8119b1a3d1e5..bd4308010466 100644
>> > --- a/drivers/scsi/ufs/ufshpb.h
>> > +++ b/drivers/scsi/ufs/ufshpb.h
>> > @@ -121,6 +121,10 @@ struct ufshpb_region {
>> > struct list_head list_lru_rgn;
>> > unsigned long rgn_flags;
>> > #define RGN_FLAG_DIRTY 0
>> > +
>> > + /* region reads - for host mode */
>> > + spinlock_t rgn_lock;
>> > + unsigned int reads;
>> > };
>> >
>> > #define for_each_sub_region(rgn, i, srgn) \
>> > @@ -211,6 +215,7 @@ struct ufshpb_lu {
>> >
>> > /* for selecting victim */
>> > struct victim_select_info lru_info;
>> > + struct work_struct ufshpb_normalization_work;
>> >
>> > /* pinned region information */
>> > u32 lu_pinned_start;
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