linux-kernel - [PATCH RFC v3 1/2] mmc: core: Add vendor hook to control reprogram keys to Crypto Engine

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Message-Id: <20241006135530.17363-2-quic_spuppala@quicinc.com>
Date: Sun,  6 Oct 2024 19:25:29 +0530
From: Seshu Madhavi Puppala <quic_spuppala@...cinc.com>
To: Ulf Hansson <ulf.hansson@...aro.org>,
        Adrian Hunter <adrian.hunter@...el.com>
Cc: linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, quic_rampraka@...cinc.com,
        quic_nitirawa@...cinc.com, quic_sachgupt@...cinc.com,
        quic_bhaskarv@...cinc.com, quic_neersoni@...cinc.com,
        quic_gaurkash@...cinc.com, quic_spuppala@...cinc.com
Subject: [PATCH RFC v3 1/2] mmc: core: Add vendor hook to control reprogram keys to Crypto Engine

Add mmc_host_ops hook avoid_reprogram_allkeys to control
reprogramming keys to Inline Crypto Engine by vendor as some
vendors might not require this feature.

Signed-off-by: Seshu Madhavi Puppala <quic_spuppala@...cinc.com>
Co-developed-by: Ram Prakash Gupta <quic_rampraka@...cinc.com>
Signed-off-by: Ram Prakash Gupta <quic_rampraka@...cinc.com>
---
 drivers/mmc/core/crypto.c | 8 +++++---
 drivers/mmc/host/sdhci.c  | 6 ++++++
 include/linux/mmc/host.h  | 7 +++++++
 3 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/drivers/mmc/core/crypto.c b/drivers/mmc/core/crypto.c
index fec4fbf16a5b..4168f7d135ff 100644
--- a/drivers/mmc/core/crypto.c
+++ b/drivers/mmc/core/crypto.c
@@ -14,9 +14,11 @@
 
 void mmc_crypto_set_initial_state(struct mmc_host *host)
 {
-	/* Reset might clear all keys, so reprogram all the keys. */
-	if (host->caps2 & MMC_CAP2_CRYPTO)
-		blk_crypto_reprogram_all_keys(&host->crypto_profile);
+	if (host->ops->avoid_reprogram_allkeys && !host->ops->avoid_reprogram_allkeys()) {
+		/* Reset might clear all keys, so reprogram all the keys. */
+		if (host->caps2 & MMC_CAP2_CRYPTO)
+			blk_crypto_reprogram_all_keys(&host->crypto_profile);
+	}
 }
 
 void mmc_crypto_setup_queue(struct request_queue *q, struct mmc_host *host)
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index fbf7a91bed35..cd663899c025 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -2704,6 +2704,11 @@ int sdhci_start_signal_voltage_switch(struct mmc_host *mmc,
 }
 EXPORT_SYMBOL_GPL(sdhci_start_signal_voltage_switch);
 
+static bool sdhci_avoid_reprogram_allkeys(void)
+{
+	return false;
+}
+
 static int sdhci_card_busy(struct mmc_host *mmc)
 {
 	struct sdhci_host *host = mmc_priv(mmc);
@@ -3066,6 +3071,7 @@ static const struct mmc_host_ops sdhci_ops = {
 	.execute_tuning			= sdhci_execute_tuning,
 	.card_event			= sdhci_card_event,
 	.card_busy	= sdhci_card_busy,
+	.avoid_reprogram_allkeys	= sdhci_avoid_reprogram_allkeys,
 };
 
 /*****************************************************************************\
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 88c6a76042ee..c4109d17f177 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -218,6 +218,13 @@ struct mmc_host_ops {
 
 	/* Initialize an SD express card, mandatory for MMC_CAP2_SD_EXP. */
 	int	(*init_sd_express)(struct mmc_host *host, struct mmc_ios *ios);
+
+	/*
+	 * Optional callback to support controllers that dont require to
+	 * reprogram all crypto keys on card suspend/resume.
+	 */
+	bool	(*avoid_reprogram_allkeys)(void);
+
 };
 
 struct mmc_cqe_ops {
-- 
2.17.1