linux-kernel - [PATCH v5 3/4] scsi: ufs: Introduce event

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Date:   Sat, 5 Dec 2020 19:59:00 +0800
From:   Stanley Chu <stanley.chu@...iatek.com>
To:     <linux-scsi@...r.kernel.org>, <martin.petersen@...cle.com>,
        <avri.altman@....com>, <alim.akhtar@...sung.com>,
        <jejb@...ux.ibm.com>
CC:     <beanhuo@...ron.com>, <asutoshd@...eaurora.org>,
        <cang@...eaurora.org>, <matthias.bgg@...il.com>,
        <bvanassche@....org>, <linux-mediatek@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <kuohong.wang@...iatek.com>,
        <peter.wang@...iatek.com>, <chun-hung.wu@...iatek.com>,
        <andy.teng@...iatek.com>, <chaotian.jing@...iatek.com>,
        <cc.chou@...iatek.com>, <jiajie.hao@...iatek.com>,
        <alice.chao@...iatek.com>, <huadian.liu@...iatek.com>,
        Stanley Chu <stanley.chu@...iatek.com>
Subject: [PATCH v5 3/4] 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.

Reviewed-by: Asutosh Das <asutoshd@...eaurora.org>
Reviewed-by: Can Guo <cang@...eaurora.org>
Signed-off-by: Stanley Chu <stanley.chu@...iatek.com>
---
 drivers/scsi/ufs/ufshcd.c |  2 ++
 drivers/scsi/ufs/ufshcd.h | 11 +++++++++++
 2 files changed, 13 insertions(+)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 1a7d31849511..6e72c0543c7b 100644
--- 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 b55a71c10fa6..8c44929bed53 100644
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h
@@ -319,6 +319,7 @@ 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;
@@ -353,6 +354,8 @@ 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  */
@@ -1100,6 +1103,14 @@ 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)
 {
-- 
2.18.0