On 3/20/2013 5:28 PM, Yaniv Gardi wrote:
This patch adds a method to trigger Sanitize command to MMC. The Sanitize command is used for deleting the unmapped memory region of the MMC device. Signed-off-by: Yaniv Gardi <ygardi@xxxxxxxxxxxxxx> diff --git a/mmc.c b/mmc.c index a2de863..174d9a4 100644 --- a/mmc.c +++ b/mmc.c @@ -90,6 +90,11 @@ static struct Command commands[] = { "Permanently disable the eMMC H/W Reset feature on <device>.\nNOTE! This is a one-time programmable (unreversible) change.", NULL }, + { do_sanitize, -1, + "sanitize", "<device>\n" + "Send Sanitize command to the <device>.\nThis will delete the unmapped memory region of the device", + NULL + }, { 0, 0, 0, 0 } };diff --git a/mmc.h b/mmc.hindex c863751..5173d34 100644 --- a/mmc.h +++ b/mmc.h @@ -38,6 +38,7 @@ #define EXT_CSD_PART_CONFIG 179 #define EXT_CSD_BOOT_WP 173 #define EXT_CSD_WR_REL_PARAM 166 +#define EXT_CSD_SANITIZE_START 165 #define EXT_CSD_BKOPS_EN 163 /* R/W */ #define EXT_CSD_RST_N_FUNCTION 162 /* R/W */ #define EXT_CSD_NATIVE_SECTOR_SIZE 63 /* R */ diff --git a/mmc_cmds.c b/mmc_cmds.c index b407f65..5473a20 100644 --- a/mmc_cmds.c +++ b/mmc_cmds.c @@ -767,3 +767,31 @@ int do_read_extcsd(int nargs, char **argv) out_free: return ret; } + +int do_sanitize(int nargs, char **argv) +{ + int fd, ret; + char *device; + + CHECK(nargs != 2, "Usage: mmc sanitize </path/to/mmcblkX>\n", + exit(1)); + + device = argv[1]; + + fd = open(device, O_RDWR); + if (fd < 0) { + perror("open"); + exit(1); + } + + ret = write_extcsd_value(fd, EXT_CSD_SANITIZE_START, 1); + if (ret) { + fprintf(stderr, "Could not write 0x%02x to EXT_CSD[%d] in %s\n", + 1, EXT_CSD_SANITIZE_START, device); + exit(1); + } +
don't we need to close the opened blkdev file here? or is it done somewhere else?
+ return ret; + +} + diff --git a/mmc_cmds.h b/mmc_cmds.h index e52d622..ec22eee 100644 --- a/mmc_cmds.h +++ b/mmc_cmds.h @@ -24,3 +24,4 @@ int do_write_boot_en(int nargs, char **argv); int do_write_bkops_en(int nargs, char **argv); int do_hwreset_en(int nargs, char **argv); int do_hwreset_dis(int nargs, char **argv); +int do_sanitize(int nargs, char **argv);
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