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

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Message-ID: <6bb2fd28feb0cd6372a32673d6cfa164@codeaurora.org>
Date:   Tue, 06 Apr 2021 14:00:42 +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 v7 06/11] scsi: ufshpb: Region inactivation in host mode

On 2021-04-06 13:20, Avri Altman wrote:
>> > -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.

Hi Avri,

Checked on my setup, this lead to compilation error. Will you fix it in 
next version?

warning: variable 'flags' is uninitialized when used here 
[-Wuninitialized]

Thanks,
Can Guo.

> 
> 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 {