linux-kernel - [PATCH V2 1/2] mmc: block: Support Host to control FUA

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Date:   Fri, 21 Oct 2022 15:30:24 +0800
From:   Wenchao Chen <wenchao.chen666@...il.com>
To:     ulf.hansson@...aro.org, adrian.hunter@...el.com,
        orsonzhai@...il.com, baolin.wang@...ux.alibaba.com,
        zhang.lyra@...il.com, axboe@...nel.dk, avri.altman@....com,
        kch@...dia.com
Cc:     CLoehle@...erstone.com, vincent.whitchurch@...s.com,
        bigeasy@...utronix.de, s.shtylyov@....ru,
        michael@...winnertech.com, linux-mmc@...r.kernel.org,
        linux-kernel@...r.kernel.org, megoo.tang@...il.com,
        lzx.stg@...il.com
Subject: [PATCH V2 1/2] mmc: block: Support Host to control FUA

From: Wenchao Chen <wenchao.chen@...soc.com>

This patch introduces host->fua_disable for MMC host controller.
The host can turn off FUA to improve performance.

Signed-off-by: Wenchao Chen <wenchao.chen@...soc.com>
---
V1 -> V2
Address Chaitanyak's suggestions
Address Avri's suggestions
---
 drivers/mmc/core/block.c | 3 ++-
 include/linux/mmc/host.h | 3 +++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
index 54cd009aee50..333e819e077a 100644
--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c
@@ -2490,7 +2490,8 @@ static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
 	    ((card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN) ||
 	     card->ext_csd.rel_sectors)) {
 		md->flags |= MMC_BLK_REL_WR;
-		fua_enabled = true;
+		if (!card->host->fua_disable)
+			fua_enabled = true;
 		cache_enabled = true;
 	}
 	if (mmc_cache_enabled(card->host))
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 8fdd3cf971a3..16a5bee3eeae 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -517,6 +517,9 @@ struct mmc_host {
 	struct blk_crypto_profile crypto_profile;
 #endif
 
+	/* Host FUA support */
+	bool			fua_disable;
+
 	/* Host Software Queue support */
 	bool			hsq_enabled;
 
-- 
2.17.1