linux-kernel - [PATCH 1/3] ufs: core: Add Event Specific Interrupt configuration vendor specific ops

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Date:   Fri,  2 Dec 2022 00:15:05 -0800
From:   Can Guo <quic_cang@...cinc.com>
To:     quic_asutoshd@...cinc.com, bvanassche@....org, mani@...nel.org,
        stanley.chu@...iatek.com, adrian.hunter@...el.com,
        beanhuo@...ron.com, avri.altman@....com, junwoo80.lee@...sung.com,
        martin.petersen@...cle.com
Cc:     linux-scsi@...r.kernel.org, Can Guo <quic_cang@...cinc.com>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        Jinyoung Choi <j-young.choi@...sung.com>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 1/3] ufs: core: Add Event Specific Interrupt configuration vendor specific ops

As Event Specific Interrupt message format is not defined in UFSHCI JEDEC
specs, and the ESI handling highly depends on how the format is designed,
hence add a vendor specific ops such that SoC vendors can configure their
own ESI handlers. If ESI vops is not provided or returning error, go with
the legacy (central) interrupt way.

Signed-off-by: Can Guo <quic_cang@...cinc.com>
---
 drivers/ufs/core/ufshcd-priv.h | 8 ++++++++
 drivers/ufs/core/ufshcd.c      | 5 +++++
 include/ufs/ufshcd.h           | 2 ++
 3 files changed, 15 insertions(+)

diff --git a/drivers/ufs/core/ufshcd-priv.h b/drivers/ufs/core/ufshcd-priv.h
index ff03aa5..802029e 100644
--- a/drivers/ufs/core/ufshcd-priv.h
+++ b/drivers/ufs/core/ufshcd-priv.h
@@ -276,6 +276,14 @@ static inline int ufshcd_vops_get_outstanding_cqs(struct ufs_hba *hba,
 	return -EOPNOTSUPP;
 }
 
+static inline int ufshcd_mcq_vops_config_esi(struct ufs_hba *hba)
+{
+	if (hba->vops && hba->vops->config_esi)
+		return hba->vops->config_esi(hba);
+
+	return -EOPNOTSUPP;
+}
+
 extern const struct ufs_pm_lvl_states ufs_pm_lvl_states[];
 
 /**
diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index e9d6891..3762dca 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -8375,6 +8375,11 @@ static int ufshcd_alloc_mcq(struct ufs_hba *hba)
 
 static void ufshcd_config_mcq(struct ufs_hba *hba)
 {
+	int ret;
+
+	ret = ufshcd_mcq_vops_config_esi(hba);
+	dev_info(hba->dev, "ESI %sconfigured\n", ret ? "is not " : "");
+
 	ufshcd_enable_intr(hba, UFSHCD_ENABLE_MCQ_INTRS);
 	ufshcd_mcq_make_queues_operational(hba);
 	ufshcd_mcq_config_mac(hba, hba->nutrs);
diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h
index f20557b..7f0139b 100644
--- a/include/ufs/ufshcd.h
+++ b/include/ufs/ufshcd.h
@@ -302,6 +302,7 @@ struct ufs_pwr_mode_info {
  * @get_hba_mac: called to get vendor specific mac value, mandatory for mcq mode
  * @op_runtime_config: called to config Operation and runtime regs Pointers
  * @get_outstanding_cqs: called to get outstanding completion queues
+ * @config_esi: called to config Event Specific Interrupt
  */
 struct ufs_hba_variant_ops {
 	const char *name;
@@ -345,6 +346,7 @@ struct ufs_hba_variant_ops {
 	int	(*op_runtime_config)(struct ufs_hba *hba);
 	int	(*get_outstanding_cqs)(struct ufs_hba *hba,
 				       unsigned long *ocqs);
+	int	(*config_esi)(struct ufs_hba *hba);
 };
 
 /* clock gating state  */
-- 
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