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mmc: rpmb: Fix driver routing memory alignment with tmp buffer

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Fix mmc_rpmb_route_frames() implementation to comply with most MMC
drivers that expect some alignment of MMC data frames in memory.

When called from drivers/tee/optee/rpmb.c, the address passed is not
aligned properly. OP-TEE OS inserts a 6-byte header before a raw RPMB
frame which makes RPMB data buffer not 32bit aligned. To prevent breaking
ABI with OPTEE-OS RPC memrefs, allocate a temporary buffer to copy the
data into an aligned memory.

Many RPMB drivers implicitly expect 32bit alignment of the eMMC frame
including arm_pl180_mmci.c, sandbox_mmc.c and stm32_sdmmc2.c

Signed-off-by: Timothée Cercueil <timothee.cercueil@st.com>
Signed-off-by: Timothée Cercueil <litchi.pi@protonmail.com>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
This commit is contained in:
litchipi 2021-06-15 08:53:06 +00:00 committed by Peng Fan
parent 15f7e0dc01
commit a9f7be509a
1 changed files with 16 additions and 2 deletions
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18
drivers/mmc/rpmb.c
View file

@ -480,10 +480,24 @@ int mmc_rpmb_route_frames(struct mmc *mmc, void *req, unsigned long reqlen,
* and possibly just delay an eventual error which will be harder * and possibly just delay an eventual error which will be harder
* to track down. * to track down.
*/ */
void *rpmb_data = NULL;
int ret;
if (reqlen % sizeof(struct s_rpmb) || rsplen % sizeof(struct s_rpmb)) if (reqlen % sizeof(struct s_rpmb) || rsplen % sizeof(struct s_rpmb))
return -EINVAL; return -EINVAL;
return rpmb_route_frames(mmc, req, reqlen / sizeof(struct s_rpmb), if (!IS_ALIGNED((uintptr_t)req, ARCH_DMA_MINALIGN)) {
rsp, rsplen / sizeof(struct s_rpmb)); /* Memory alignment is required by MMC driver */
rpmb_data = malloc(reqlen);
if (!rpmb_data)
return -ENOMEM;
memcpy(rpmb_data, req, reqlen);
req = rpmb_data;
}
ret = rpmb_route_frames(mmc, req, reqlen / sizeof(struct s_rpmb),
rsp, rsplen / sizeof(struct s_rpmb));
free(rpmb_data);
return ret;
} }