scsi: ufs: Introduce event_notify variant function

Introduce event_notify variant function to allow vendor to get notification
of important events and connect to any proprietary debugging facilities.

Link: https://lore.kernel.org/r/20201205115901.26815-4-stanley.chu@mediatek.com
Reviewed-by: Asutosh Das <asutoshd@codeaurora.org>
Reviewed-by: Can Guo <cang@codeaurora.org>
Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index f630955141df634ddedd06bbdd24998adeb98dcb..308f624b3830ef838082edeea8697a355292a01d 100644 (file)
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -4480,6 +4480,8 @@ void ufshcd_update_evt_hist(struct ufs_hba *hba, u32 id, u32 val)
        e->val[e->pos] = val;
        e->tstamp[e->pos] = ktime_get();
        e->pos = (e->pos + 1) % UFS_EVENT_HIST_LENGTH;
+
+       ufshcd_vops_event_notify(hba, id, &val);
 }
 EXPORT_SYMBOL_GPL(ufshcd_update_evt_hist);
 

diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index b2eab23a17e8b024d1136fac6bc1ec3fad4fcfc6..8159932398982033c78dcf109a545037c49c27f3 100644 (file)
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h
@@ -320,6 +320,7 @@ struct ufs_pwr_mode_info {
  * @phy_initialization: used to initialize phys
  * @device_reset: called to issue a reset pulse on the UFS device
  * @program_key: program or evict an inline encryption key
+ * @event_notify: called to notify important events
  */
 struct ufs_hba_variant_ops {
        const char *name;
@@ -355,6 +356,8 @@ struct ufs_hba_variant_ops {
                                        void *data);
        int     (*program_key)(struct ufs_hba *hba,
                               const union ufs_crypto_cfg_entry *cfg, int slot);
+       void    (*event_notify)(struct ufs_hba *hba,
+                               enum ufs_event_type evt, void *data);
 };
 
 /* clock gating state  */
@@ -1102,6 +1105,14 @@ static inline int ufshcd_vops_clk_scale_notify(struct ufs_hba *hba,
        return 0;
 }
 
+static inline void ufshcd_vops_event_notify(struct ufs_hba *hba,
+                                           enum ufs_event_type evt,
+                                           void *data)
+{
+       if (hba->vops && hba->vops->event_notify)
+               hba->vops->event_notify(hba, evt, data);
+}
+
 static inline int ufshcd_vops_setup_clocks(struct ufs_hba *hba, bool on,
                                        enum ufs_notify_change_status status)
 {