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Date: Wed, 17 Mar 2021 11:23:45 +0000
From: Avri Altman <Avri.Altman@....com>
To: Can Guo <cang@...eaurora.org>
CC: "James E . J . Bottomley" <jejb@...ux.vnet.ibm.com>,
"Martin K . Petersen" <martin.petersen@...cle.com>,
"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"gregkh@...uxfoundation.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" <alim.akhtar@...sung.com>,
"asutoshd@...eaurora.org" <asutoshd@...eaurora.org>,
Zang Leigang <zangleigang@...ilicon.com>,
Avi Shchislowski <Avi.Shchislowski@....com>,
Bean Huo <beanhuo@...ron.com>,
"stanley.chu@...iatek.com" <stanley.chu@...iatek.com>
Subject: RE: [PATCH v5 06/10] scsi: ufshpb: Add hpb dev reset response
>
> On 2021-03-02 21:24, Avri Altman wrote:
> > The spec does not define what is the host's recommended response when
> > the device send hpb dev reset response (oper 0x2).
> >
> > We will update all active hpb regions: mark them and do that on the
> > next
> > read.
> >
> > Signed-off-by: Avri Altman <avri.altman@....com>
> > ---
> > drivers/scsi/ufs/ufshpb.c | 47
> ++++++++++++++++++++++++++++++++++++---
> > drivers/scsi/ufs/ufshpb.h | 2 ++
> > 2 files changed, 46 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/scsi/ufs/ufshpb.c b/drivers/scsi/ufs/ufshpb.c
> > index 0744feb4d484..0034fa03fdc6 100644
> > --- a/drivers/scsi/ufs/ufshpb.c
> > +++ b/drivers/scsi/ufs/ufshpb.c
> > @@ -642,7 +642,8 @@ int ufshpb_prep(struct ufs_hba *hba, struct
> > ufshcd_lrb *lrbp)
> > if (rgn->reads == ACTIVATION_THRESHOLD)
> > activate = true;
> > spin_unlock_irqrestore(&rgn->rgn_lock, flags);
> > - if (activate) {
> > + if (activate ||
> > + test_and_clear_bit(RGN_FLAG_UPDATE, &rgn->rgn_flags)) {
> > spin_lock_irqsave(&hpb->rsp_list_lock, flags);
> > ufshpb_update_active_info(hpb, rgn_idx, srgn_idx);
> > hpb->stats.rb_active_cnt++;
> > @@ -1480,6 +1481,20 @@ void ufshpb_rsp_upiu(struct ufs_hba *hba,
> > struct ufshcd_lrb *lrbp)
> > case HPB_RSP_DEV_RESET:
> > dev_warn(&hpb->sdev_ufs_lu->sdev_dev,
> > "UFS device lost HPB information during PM.\n");
> > +
> > + if (hpb->is_hcm) {
> > + struct scsi_device *sdev;
> > +
> > + __shost_for_each_device(sdev, hba->host) {
> > + struct ufshpb_lu *h = sdev->hostdata;
> > +
> > + if (!h)
> > + continue;
> > +
> > + schedule_work(&hpb->ufshpb_lun_reset_work);
> > + }
> > + }
> > +
> > break;
> > default:
> > dev_notice(&hpb->sdev_ufs_lu->sdev_dev,
> > @@ -1594,6 +1609,25 @@ static void
> > ufshpb_run_inactive_region_list(struct ufshpb_lu *hpb)
> > spin_unlock_irqrestore(&hpb->rsp_list_lock, flags);
> > }
> >
> > +static void ufshpb_reset_work_handler(struct work_struct *work)
>
> Just curious, directly doing below things inside ufshpb_rsp_upiu() does
> not
> seem a problem to me, does this really deserve a separate work?
I don't know, I never even consider of doing this.
The active region list may contain up to few thousands of regions -
It is not rare to see configurations that covers the entire device.
But yes, I can do that.
Better to get ack from Daejun first.
Thanks,
Avri
>
> Thanks,
> Can Guo.
>
> > +{
> > + struct ufshpb_lu *hpb;
> > + struct victim_select_info *lru_info;
> > + struct ufshpb_region *rgn;
> > + unsigned long flags;
> > +
> > + hpb = container_of(work, struct ufshpb_lu, ufshpb_lun_reset_work);
> > +
> > + lru_info = &hpb->lru_info;
> > +
> > + spin_lock_irqsave(&hpb->rgn_state_lock, flags);
> > +
> > + list_for_each_entry(rgn, &lru_info->lh_lru_rgn, list_lru_rgn)
> > + set_bit(RGN_FLAG_UPDATE, &rgn->rgn_flags);
> > +
> > + spin_unlock_irqrestore(&hpb->rgn_state_lock, flags);
> > +}
> > +
> > static void ufshpb_normalization_work_handler(struct work_struct
> > *work)
> > {
> > struct ufshpb_lu *hpb;
> > @@ -1798,6 +1832,8 @@ static int ufshpb_alloc_region_tbl(struct
> > ufs_hba *hba, struct ufshpb_lu *hpb)
> > } else {
> > rgn->rgn_state = HPB_RGN_INACTIVE;
> > }
> > +
> > + rgn->rgn_flags = 0;
> > }
> >
> > return 0;
> > @@ -2012,9 +2048,12 @@ 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_WORK(&hpb->ufshpb_lun_reset_work,
> > + ufshpb_reset_work_handler);
> > + }
> >
> > hpb->map_req_cache = kmem_cache_create("ufshpb_req_cache",
> > sizeof(struct ufshpb_req), 0, 0, NULL);
> > @@ -2114,8 +2153,10 @@ 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_work_sync(&hpb->ufshpb_lun_reset_work);
> > 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 84598a317897..37c1b0ea0c0a 100644
> > --- a/drivers/scsi/ufs/ufshpb.h
> > +++ b/drivers/scsi/ufs/ufshpb.h
> > @@ -121,6 +121,7 @@ struct ufshpb_region {
> > struct list_head list_lru_rgn;
> > unsigned long rgn_flags;
> > #define RGN_FLAG_DIRTY 0
> > +#define RGN_FLAG_UPDATE 1
> >
> > /* region reads - for host mode */
> > spinlock_t rgn_lock;
> > @@ -217,6 +218,7 @@ struct ufshpb_lu {
> > /* for selecting victim */
> > struct victim_select_info lru_info;
> > struct work_struct ufshpb_normalization_work;
> > + struct work_struct ufshpb_lun_reset_work;
> >
> > /* pinned region information */
> > u32 lu_pinned_start;
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