linux-kernel - [PATCH RFC 1/3] mmc: add request_start() and request

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Message-Id: <20250206220940.10553-2-kamal.dasu@broadcom.com>
Date: Thu,  6 Feb 2025 17:09:38 -0500
From: Kamal Dasu <kamal.dasu@...adcom.com>
To: ulf.hansson@...aro.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	adrian.hunter@...el.com,
	linux-mmc@...r.kernel.org,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	wsa+renesas@...g-engineering.com
Cc: f.fainelli@...il.com,
	bcm-kernel-feedback-list@...adcom.com,
	Kamal Dasu <kdasu@...adcom.com>
Subject: [PATCH RFC 1/3] mmc: add request_start() and request_done() mmc ops

From: Kamal Dasu <kdasu@...adcom.com>

These ops enable host vendor driver to take action on request
start and request done both in case of sdhci and cqe requests.

Signed-off-by: Kamal Dasu <kdasu@...adcom.com>
---
 drivers/mmc/core/core.c  | 14 +++++++++++++-
 include/linux/mmc/host.h |  4 ++++
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 5241528f8b90..a835ebc6282c 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -206,8 +206,11 @@ void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq)
 	 * Request starter must handle retries - see
 	 * mmc_wait_for_req_done().
 	 */
-	if (mrq->done)
+	if (mrq->done) {
 		mrq->done(mrq);
+		if (host->ops->request_done)
+			host->ops->request_done(host, mrq);
+	}
 }
 
 EXPORT_SYMBOL(mmc_request_done);
@@ -340,6 +343,9 @@ int mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
 
 	init_completion(&mrq->cmd_completion);
 
+	if (host->ops->request_start)
+		host->ops->request_start(host, mrq);
+
 	mmc_retune_hold(host);
 
 	if (mmc_card_removed(host->card))
@@ -437,6 +443,9 @@ int mmc_cqe_start_req(struct mmc_host *host, struct mmc_request *mrq)
 {
 	int err;
 
+	if (host->ops->request_start)
+		host->ops->request_start(host, mrq);
+
 	/*
 	 * CQE cannot process re-tuning commands. Caller must hold retuning
 	 * while CQE is in use.  Re-tuning can happen here only when CQE has no
@@ -512,6 +521,9 @@ void mmc_cqe_request_done(struct mmc_host *host, struct mmc_request *mrq)
 	}
 
 	mrq->done(mrq);
+
+	if (host->ops->request_done)
+		host->ops->request_done(host, mrq);
 }
 EXPORT_SYMBOL(mmc_cqe_request_done);
 
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 68f09a955a90..739b14117c26 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -171,6 +171,10 @@ struct mmc_host_ops {
 			    int err);
 	void	(*pre_req)(struct mmc_host *host, struct mmc_request *req);
 	void	(*request)(struct mmc_host *host, struct mmc_request *req);
+	void	(*request_start)(struct mmc_host *host,
+				 struct mmc_request *req);
+	void	(*request_done)(struct mmc_host *host,
+				 struct mmc_request *req);
 	/* Submit one request to host in atomic context. */
 	int	(*request_atomic)(struct mmc_host *host,
 				  struct mmc_request *req);
-- 
2.17.1