linux-ext4 - [PATCH 3/9] mmc: dw_mmc: support crypto operation

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Date:   Wed, 21 Aug 2019 15:42:18 +0900
From:   "boojin.kim" <boojin.kim@...sung.com>
To:     "'Jaehoon Chung'" <jh80.chung@...sung.com>,
        "'Ulf Hansson'" <ulf.hansson@...aro.org>,
        <linux-mmc@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Cc:     "'Herbert Xu'" <herbert@...dor.apana.org.au>,
        "'David S. Miller'" <davem@...emloft.net>,
        "'Eric Biggers'" <ebiggers@...nel.org>,
        "'Theodore Y. Ts'o'" <tytso@....edu>,
        "'Chao Yu'" <chao@...nel.org>,
        "'Jaegeuk Kim'" <jaegeuk@...nel.org>,
        "'Andreas Dilger'" <adilger.kernel@...ger.ca>,
        "'Theodore Ts'o'" <tytso@....edu>, <dm-devel@...hat.com>,
        "'Mike Snitzer'" <snitzer@...hat.com>,
        "'Alasdair Kergon'" <agk@...hat.com>,
        "'Jens Axboe'" <axboe@...nel.dk>,
        "'Krzysztof Kozlowski'" <krzk@...nel.org>,
        "'Kukjin Kim'" <kgene@...nel.org>,
        "'Jaehoon Chung'" <jh80.chung@...sung.com>,
        "'Ulf Hansson'" <ulf.hansson@...aro.org>,
        <linux-crypto@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-fscrypt@...r.kernel.org>, <linux-mmc@...r.kernel.org>,
        <linux-samsung-soc@...r.kernel.org>, <linux-block@...r.kernel.org>,
        <linux-ext4@...r.kernel.org>,
        <linux-f2fs-devel@...ts.sourceforge.net>,
        <linux-samsung-soc@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-fsdevel@...r.kernel.org>
Subject: [PATCH 3/9] mmc: dw_mmc: support crypto operation

This patch supports the crypto operation in mmc driver.
Two vops are added to dw_mci_drv_data for it.
The crypto_engine_cfg() is required to set crypto information such as
key and algorithm modes before I/O.
The crypto_engine_clear() is required to clear the crypto information
set in the H/W after I/O.

Cc: Jaehoon Chung <jh80.chung@...sung.com>
Cc: Ulf Hansson <ulf.hansson@...aro.org>
Signed-off-by: Boojin Kim <boojin.kim@...sung.com>
---
 drivers/mmc/host/dw_mmc.c | 22 +++++++++++++++++++++-
 drivers/mmc/host/dw_mmc.h |  6 ++++++
 2 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index eea52e2..0cdf574 100644
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -470,6 +470,7 @@ static void dw_mci_dmac_complete_dma(void *arg)
 {
 	struct dw_mci *host = arg;
 	struct mmc_data *data = host->data;
+	const struct dw_mci_drv_data *drv_data = host->drv_data;
 
 	dev_vdbg(host->dev, "DMA complete\n");
 
@@ -481,6 +482,9 @@ static void dw_mci_dmac_complete_dma(void *arg)
 				    data->sg_len,
 				    DMA_FROM_DEVICE);
 
+	if (drv_data && drv_data->crypto_engine_clear)
+		drv_data->crypto_engine_clear(host, host->sg_cpu, false);
+
 	host->dma_ops->cleanup(host);
 
 	/*
@@ -577,8 +581,10 @@ static inline int dw_mci_prepare_desc64(struct dw_mci
*host,
 {
 	unsigned int desc_len;
 	struct idmac_desc_64addr *desc_first, *desc_last, *desc;
+	int i, ret;
+	const struct dw_mci_drv_data *drv_data = host->drv_data;
+	int sector_offset = 0;
 	u32 val;
-	int i;
 
 	desc_first = desc_last = desc = host->sg_cpu;
 
@@ -618,6 +624,20 @@ static inline int dw_mci_prepare_desc64(struct dw_mci
*host,
 			desc->des4 = mem_addr & 0xffffffff;
 			desc->des5 = mem_addr >> 32;
 
+			if (drv_data && drv_data->crypto_engine_cfg) {
+				ret = drv_data->crypto_engine_cfg(host,
desc,
+						data, sg_page(&data->sg[i]),
i,
+						sector_offset, false);
+				if (ret) {
+					dev_err(host->dev,
+						"%s: fail to set
crypto(%d)\n",
+						__func__, ret);
+					return -EPERM;
+				}
+				/* mmc sector size */
+				sector_offset += desc_len / 512;
+			}
+
 			/* Update physical address for the next desc */
 			mem_addr += desc_len;
 
diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h
index da5923a..b32d39b 100644
--- a/drivers/mmc/host/dw_mmc.h
+++ b/drivers/mmc/host/dw_mmc.h
@@ -563,5 +563,11 @@ struct dw_mci_drv_data {
 						struct mmc_ios *ios);
 	int		(*switch_voltage)(struct mmc_host *mmc,
 					  struct mmc_ios *ios);
+	int		(*crypto_engine_cfg)(struct dw_mci *host, void
*desc,
+				struct mmc_data *data, struct page *page,
+				int page_offset, int sector_offset,
+				bool cmdq_enabled);
+	int		(*crypto_engine_clear)(struct dw_mci *host,
+				void *desc, bool cmdq_enabled);
 };
 #endif /* _DW_MMC_H_ */
-- 
2.7.4