linux-kernel - RE: [PATCH v7 06/11] scsi: ufshpb: Region inactivation in host mode

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Date:   Tue, 6 Apr 2021 05:20:32 +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 v7 06/11] scsi: ufshpb: Region inactivation in host mode

> > -static void __ufshpb_evict_region(struct ufshpb_lu *hpb,
> > -                               struct ufshpb_region *rgn)
> > +static int __ufshpb_evict_region(struct ufshpb_lu *hpb,
> > +                              struct ufshpb_region *rgn)
> >  {
> >       struct victim_select_info *lru_info;
> >       struct ufshpb_subregion *srgn;
> >       int srgn_idx;
> >
> > +     lockdep_assert_held(&hpb->rgn_state_lock);
> > +
> > +     if (hpb->is_hcm) {
> > +             unsigned long flags;
> > +             int ret;
> > +
> > +             spin_unlock_irqrestore(&hpb->rgn_state_lock, flags);
> 
> Never seen a usage like this... Here flags is used without being
> intialized.
> The flag is needed when spin_unlock_irqrestore ->
> local_irq_restore(flags) to
> restore the DAIF register (in terms of ARM).
OK.

Thanks,
Avri

> 
> Thanks,
> 
> Can Guo.
> 
> > +             ret = ufshpb_issue_umap_single_req(hpb, rgn);
> > +             spin_lock_irqsave(&hpb->rgn_state_lock, flags);
> > +             if (ret)
> > +                     return ret;
> > +     }
> > +
> >       lru_info = &hpb->lru_info;
> >
> >       dev_dbg(&hpb->sdev_ufs_lu->sdev_dev, "evict region %d\n",
> > rgn->rgn_idx);
> > @@ -1130,6 +1150,8 @@ static void __ufshpb_evict_region(struct
> > ufshpb_lu *hpb,
> >
> >       for_each_sub_region(rgn, srgn_idx, srgn)
> >               ufshpb_purge_active_subregion(hpb, srgn);
> > +
> > +     return 0;
> >  }
> >
> >  static int ufshpb_evict_region(struct ufshpb_lu *hpb, struct
> > ufshpb_region *rgn)
> > @@ -1151,7 +1173,7 @@ static int ufshpb_evict_region(struct ufshpb_lu
> > *hpb, struct ufshpb_region *rgn)
> >                       goto out;
> >               }
> >
> > -             __ufshpb_evict_region(hpb, rgn);
> > +             ret = __ufshpb_evict_region(hpb, rgn);
> >       }
> >  out:
> >       spin_unlock_irqrestore(&hpb->rgn_state_lock, flags);
> > @@ -1285,7 +1307,9 @@ static int ufshpb_add_region(struct ufshpb_lu
> > *hpb, struct ufshpb_region *rgn)
> >                               "LRU full (%d), choose victim %d\n",
> >                               atomic_read(&lru_info->active_cnt),
> >                               victim_rgn->rgn_idx);
> > -                     __ufshpb_evict_region(hpb, victim_rgn);
> > +                     ret = __ufshpb_evict_region(hpb, victim_rgn);
> > +                     if (ret)
> > +                             goto out;
> >               }
> >
> >               /*
> > @@ -1856,6 +1880,7 @@ ufshpb_sysfs_attr_show_func(rb_noti_cnt);
> >  ufshpb_sysfs_attr_show_func(rb_active_cnt);
> >  ufshpb_sysfs_attr_show_func(rb_inactive_cnt);
> >  ufshpb_sysfs_attr_show_func(map_req_cnt);
> > +ufshpb_sysfs_attr_show_func(umap_req_cnt);
> >
> >  static struct attribute *hpb_dev_stat_attrs[] = {
> >       &dev_attr_hit_cnt.attr,
> > @@ -1864,6 +1889,7 @@ static struct attribute *hpb_dev_stat_attrs[] = {
> >       &dev_attr_rb_active_cnt.attr,
> >       &dev_attr_rb_inactive_cnt.attr,
> >       &dev_attr_map_req_cnt.attr,
> > +     &dev_attr_umap_req_cnt.attr,
> >       NULL,
> >  };
> >
> > @@ -1988,6 +2014,7 @@ static void ufshpb_stat_init(struct ufshpb_lu
> > *hpb)
> >       hpb->stats.rb_active_cnt = 0;
> >       hpb->stats.rb_inactive_cnt = 0;
> >       hpb->stats.map_req_cnt = 0;
> > +     hpb->stats.umap_req_cnt = 0;
> >  }
> >
> >  static void ufshpb_param_init(struct ufshpb_lu *hpb)
> > diff --git a/drivers/scsi/ufs/ufshpb.h b/drivers/scsi/ufs/ufshpb.h
> > index 87495e59fcf1..1ea58c17a4de 100644
> > --- a/drivers/scsi/ufs/ufshpb.h
> > +++ b/drivers/scsi/ufs/ufshpb.h
> > @@ -191,6 +191,7 @@ struct ufshpb_stats {
> >       u64 rb_inactive_cnt;
> >       u64 map_req_cnt;
> >       u64 pre_req_cnt;
> > +     u64 umap_req_cnt;
> >  };
> >
> >  struct ufshpb_lu {