On 3/22/2013 10:42 PM, Chris Ball wrote:
Hi,
On Fri, Mar 22 2013, Subhash Jadavani wrote:
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.h
index 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?
Linux closes open file descriptors on process exit, no?
ok then it looks good to me.
Acked-by: Subhash Jadavani <subhashj@xxxxxxxxxxxxxx>
Thanks,
Subhash
- Chris.
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