linux-kernel - [PATCH RFT v3 2/3] ufs: core: track when MCQ ESI is enabled

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Message-Id: <20250407-topic-ufs-use-threaded-irq-v3-2-08bee980f71e@linaro.org>
Date: Mon, 07 Apr 2025 12:17:04 +0200
From: Neil Armstrong <neil.armstrong@...aro.org>
To: Alim Akhtar <alim.akhtar@...sung.com>, 
 Avri Altman <avri.altman@....com>, Bart Van Assche <bvanassche@....org>, 
 "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>, 
 "Martin K. Petersen" <martin.petersen@...cle.com>
Cc: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>, 
 linux-arm-msm@...r.kernel.org, linux-scsi@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Neil Armstrong <neil.armstrong@...aro.org>
Subject: [PATCH RFT v3 2/3] ufs: core: track when MCQ ESI is enabled

In preparation of adding a threaded interrupt handler, track when
the MCQ ESI interrupt handlers were installed so we can optimize the
MCQ interrupt handling to avoid walking the threaded handler in the case
ESI handlers are enabled.

Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
---
 drivers/ufs/core/ufshcd.c | 1 +
 include/ufs/ufshcd.h      | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index 5e73ac1e00788f3d599f0b3eb6e2806df9b6f6c3..7f256f77b8ba9853569157db7785d177b6cd6dee 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -8717,6 +8717,7 @@ static void ufshcd_config_mcq(struct ufs_hba *hba)
 	u32 intrs;

 	ret = ufshcd_mcq_vops_config_esi(hba);
+	hba->mcq_esi_enabled = !ret;
 	dev_info(hba->dev, "ESI %sconfigured\n", ret ? "is not " : "");

 	intrs = UFSHCD_ENABLE_MCQ_INTRS;
diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h
index fffa9cc465433604570f91b8e882b58cd985f35b..ec999fa671240cb87bf540d339aa830b6847eb71 100644
--- a/include/ufs/ufshcd.h
+++ b/include/ufs/ufshcd.h
@@ -954,6 +954,7 @@ enum ufshcd_mcq_opr {
  *	ufshcd_resume_complete()
  * @mcq_sup: is mcq supported by UFSHC
  * @mcq_enabled: is mcq ready to accept requests
+ * @mcq_esi_enabled: is mcq ESI configured
  * @res: array of resource info of MCQ registers
  * @mcq_base: Multi circular queue registers base address
  * @uhq: array of supported hardware queues
@@ -1122,6 +1123,7 @@ struct ufs_hba {
 	bool mcq_sup;
 	bool lsdb_sup;
 	bool mcq_enabled;
+	bool mcq_esi_enabled;
 	struct ufshcd_res_info res[RES_MAX];
 	void __iomem *mcq_base;
 	struct ufs_hw_queue *uhq;

-- 
2.34.1