linux-kernel - [PATCH] scsi: ufs: core: Add ufshcd_send_bsg_uic

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Message-Id: <20241113103057.714531-1-quic_ziqichen@quicinc.com>
Date: Wed, 13 Nov 2024 18:30:46 +0800
From: Ziqi Chen <quic_ziqichen@...cinc.com>
To: quic_asutoshd@...cinc.com, quic_cang@...cinc.com, bvanassche@....org,
        mani@...nel.org, beanhuo@...ron.com, avri.altman@....com,
        junwoo80.lee@...sung.com, martin.petersen@...cle.com,
        quic_ziqichen@...cinc.com, quic_nguyenb@...cinc.com,
        quic_nitirawa@...cinc.com, quic_rampraka@...cinc.com
Cc: linux-scsi@...r.kernel.org, Alim Akhtar <alim.akhtar@...sung.com>,
        "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
        Hannes Reinecke <hare@...e.de>,
        Johannes Thumshirn <johannes.thumshirn@....com>,
        Peter Wang <peter.wang@...iatek.com>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Andrew Halaney <ahalaney@...hat.com>,
        Maramaina Naresh <quic_mnaresh@...cinc.com>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] scsi: ufs: core: Add ufshcd_send_bsg_uic_cmd() for UFS BSG

User layer applications can send UIC GET/SET commands via the BSG
framework, and if the user layer application sends a UIC SET command
to the PA_PWRMODE attribute, a power mode change shall be initiated
in UniPro and two interrupts shall be triggered if the power mode is
successfully changed, i.e., UIC Command Completion interrupt and UIC
Power Mode interrupt.

The current UFS BSG code calls ufshcd_send_uic_cmd() directly, with
which the second interrupt, i.e., UIC Power Mode interrupt, shall be
treated as unhandled interrupt. In addition, after the UIC command is
completed, user layer application has to poll UniPro and/or M-PHY state
machine to confirm the power mode change is finished.

Add a new wrapper function ufshcd_send_bsg_uic_cmd() and call it from
ufs_bsg_request() so that if a UIC SET command is targeting the PA_PWRMODE
attribute it can be redirected to ufshcd_uic_pwr_ctrl().

Signed-off-by: Can Guo <quic_cang@...cinc.com>
Signed-off-by: Ziqi Chen <quic_ziqichen@...cinc.com>
---
 drivers/ufs/core/ufs_bsg.c     |  2 +-
 drivers/ufs/core/ufshcd-priv.h |  1 +
 drivers/ufs/core/ufshcd.c      | 36 ++++++++++++++++++++++++++++++++++
 3 files changed, 38 insertions(+), 1 deletion(-)

diff --git a/drivers/ufs/core/ufs_bsg.c b/drivers/ufs/core/ufs_bsg.c
index 433d0480391e..6c09d97ae006 100644
--- a/drivers/ufs/core/ufs_bsg.c
+++ b/drivers/ufs/core/ufs_bsg.c
@@ -170,7 +170,7 @@ static int ufs_bsg_request(struct bsg_job *job)
 		break;
 	case UPIU_TRANSACTION_UIC_CMD:
 		memcpy(&uc, &bsg_request->upiu_req.uc, UIC_CMD_SIZE);
-		ret = ufshcd_send_uic_cmd(hba, &uc);
+		ret = ufshcd_send_bsg_uic_cmd(hba, &uc);
 		if (ret)
 			dev_err(hba->dev, "send uic cmd: error code %d\n", ret);
 
diff --git a/drivers/ufs/core/ufshcd-priv.h b/drivers/ufs/core/ufshcd-priv.h
index 7aea8fbaeee8..9ffd94ddf8c7 100644
--- a/drivers/ufs/core/ufshcd-priv.h
+++ b/drivers/ufs/core/ufshcd-priv.h
@@ -84,6 +84,7 @@ int ufshcd_read_string_desc(struct ufs_hba *hba, u8 desc_index,
 			    u8 **buf, bool ascii);
 
 int ufshcd_send_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd);
+int ufshcd_send_bsg_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd);
 
 int ufshcd_exec_raw_upiu_cmd(struct ufs_hba *hba,
 			     struct utp_upiu_req *req_upiu,
diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index e338867bc96c..d168dc36eebe 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -4319,6 +4319,42 @@ static int ufshcd_uic_pwr_ctrl(struct ufs_hba *hba, struct uic_command *cmd)
 	return ret;
 }
 
+/**
+ * ufshcd_send_bsg_uic_cmd - Send UIC commands requested via BSG layer and retrieve the result
+ * @hba: per adapter instance
+ * @uic_cmd: UIC command
+ *
+ * Return: 0 only if success.
+ */
+int ufshcd_send_bsg_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd)
+{
+	int ret;
+
+	if (hba->quirks & UFSHCD_QUIRK_BROKEN_UIC_CMD)
+		return 0;
+
+	ufshcd_hold(hba);
+
+	if (uic_cmd->argument1 == UIC_ARG_MIB(PA_PWRMODE) &&
+	    uic_cmd->command == UIC_CMD_DME_SET) {
+		ret = ufshcd_uic_pwr_ctrl(hba, uic_cmd);
+		goto out;
+	}
+
+	mutex_lock(&hba->uic_cmd_mutex);
+	ufshcd_add_delay_before_dme_cmd(hba);
+
+	ret = __ufshcd_send_uic_cmd(hba, uic_cmd, true);
+	if (!ret)
+		ret = ufshcd_wait_for_uic_cmd(hba, uic_cmd);
+
+	mutex_unlock(&hba->uic_cmd_mutex);
+
+out:
+	ufshcd_release(hba);
+	return ret;
+}
+
 /**
  * ufshcd_uic_change_pwr_mode - Perform the UIC power mode chage
  *				using DME_SET primitives.
-- 
2.34.1