On 2021-03-17 19:23, Avri Altman wrote:
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.alt...@wdc.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.
Yes, true, it can be a huge list. But what does the ops
"HPB_RSP_DEV_RESET"
really mean? The specs says "Device reset HPB Regions information", but
I
don't know what is really happening. Could you please elaborate?
Thanks,
Can Guo.
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;
