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Especially, for >> the customer, every time when they update the mmc-utils, they >> should re-install this patch again, let's try to make this >> erase command upstreamed in the mmc-utils. >> >> Co-developed-by: Bean Huo >> Signed-off-by: Bean Huo >> Reviewed-by: Kenneth Gibbons >> --- >> >> Hi Ulf, >> Please help us review this mmc-utils patch, and if agree, it is >> possible to make it merged in the official mmc-utils. >> >> Changelog: >> >> V1--V2: >> 1. refactor Kimito's original patch >> 2. change to use MMC_IOC_MULTI_CMD >> 3. add checkup if eMMC devie supports secure erase/trim >> >> --- >> mmc.c | 8 ++++ >> mmc.h | 13 +++++- >> mmc_cmds.c | 135 +++++++++++++++++++++++++++++++++++++++++++++++++++++ >> mmc_cmds.h | 1 + >> 4 files changed, 156 insertions(+), 1 deletion(-) >> >> diff --git a/mmc.c b/mmc.c >> index 50c9c9e..cb29a65 100644 >> --- a/mmc.c >> +++ b/mmc.c >> @@ -215,6 +215,14 @@ static struct Command commands[] = { >> "Run Field Firmware Update with on .\n", >> NULL >> }, >> + { do_erase, -4, >> + "erase", " " " " " " "\n" >> + "Send Erase CMD38 with specific argument to the \n\n" >> + "NOTE!: This will delete all user data in the specified region of the device\n" >> + " must be: legacy | discard | secure-erase | " >> + "secure-trim1 | secure-trim2 | trim \n", >> + NULL >> + }, >> { 0, 0, 0, 0 } >> }; >> >> diff --git a/mmc.h b/mmc.h >> index 648fb26..90b7fb5 100644 >> --- a/mmc.h >> +++ b/mmc.h >> @@ -34,7 +34,15 @@ >> #define MMC_SET_WRITE_PROT 28 /* ac [31:0] data addr R1b */ >> #define MMC_CLEAR_WRITE_PROT 29 /* ac [31:0] data addr R1b */ >> #define MMC_SEND_WRITE_PROT_TYPE 31 /* ac [31:0] data addr R1 */ >> - >> +#define MMC_ERASE_GROUP_START 35 /* ac [31:0] data addr R1 */ >> +#define MMC_ERASE_GROUP_END 36 /* ac [31:0] data addr R1 */ >> +#define MMC_ERASE 38 /* ac [31] Secure request >> + [30:16] set to 0 >> + [15] Force Garbage Collect request >> + [14:2] set to 0 >> + [1] Discard Enable >> + [0] Identify Write Blocks for >> + Erase (or TRIM Enable) R1b */ >> /* >> * EXT_CSD fields >> */ >> @@ -61,6 +69,7 @@ >> #define EXT_CSD_CACHE_SIZE_2 251 >> #define EXT_CSD_CACHE_SIZE_1 250 >> #define EXT_CSD_CACHE_SIZE_0 249 >> +#define EXT_CSD_SEC_FEATURE_SUPPORT 231 >> #define EXT_CSD_BOOT_INFO 228 /* R/W */ >> #define EXT_CSD_HC_ERASE_GRP_SIZE 224 >> #define EXT_CSD_HC_WP_GRP_SIZE 221 >> @@ -177,6 +186,8 @@ >> #define EXT_CSD_REV_V4_2 2 >> #define EXT_CSD_REV_V4_1 1 >> #define EXT_CSD_REV_V4_0 0 >> +#define EXT_CSD_SEC_GB_CL_EN (1<<4) >> +#define EXT_CSD_SEC_ER_EN (1<<0) >> >> >> /* From kernel linux/mmc/core.h */ >> diff --git a/mmc_cmds.c b/mmc_cmds.c >> index fb37189..17986e3 100644 >> --- a/mmc_cmds.c >> +++ b/mmc_cmds.c >> @@ -2435,6 +2435,141 @@ int do_cache_dis(int nargs, char **argv) >> return do_cache_ctrl(0, nargs, argv); >> } >> >> +static int erase(int dev_fd, __u32 argin, __u32 start, __u32 end) >> +{ >> +#ifndef MMC_IOC_MULTI_CMD > In kernel v4.4 we added the multi cmd support, which is quite some > time ago. So, I think it's time to drop these ifdef hackary from the > userland tool. At least, we shouldn't need it for new kinds of > features that we add. Ulf Do you want us to take out the  MMC_IOC_MULTI_CMD ifdef and resubmit? Kimito > >> + fprintf(stderr, "mmc-utils has been compiled without MMC_IOC_MULTI_CMD" >> + " support, needed by erase.\n"); >> + return -ENOTSUP; >> +#else >> + int ret = 0; >> + struct mmc_ioc_multi_cmd *multi_cmd; >> + > [...] > > Kind regards > Uffe