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Message-ID: <DM6PR04MB657542B3CB77F6D894B1EA84FC409@DM6PR04MB6575.namprd04.prod.outlook.com>
Date: Wed, 28 Apr 2021 05:57:31 +0000
From: Avri Altman <Avri.Altman@....com>
To: "luserhker@...il.com" <luserhker@...il.com>,
"beanhuo@...ron.com" <beanhuo@...ron.com>,
"kenny.gibbons@...cle.com" <kenny.gibbons@...cle.com>,
"kimito.sakata@...cle.com" <kimito.sakata@...cle.com>,
"rkamdar@...ron.com" <rkamdar@...ron.com>,
"chris@...ntf.net" <chris@...ntf.net>,
"ulf.hansson@...aro.org" <ulf.hansson@...aro.org>
CC: "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH RESEND v3] mmc-utils: Add eMMC erase command support
Hi Kimito & Bean,
>
> From: Kimito Sakata <kimito.sakata@...cle.com>
>
> we have been using this erase feature for a while, but it is
> still not merged into the upstream mmc-utils. 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.
>
> We need to send 3 MMC commands and it is important that they
> stay in sequence. Therefore we are using MMC_IOC_MULTI_CMD.
You might also want to indicate on which platform it was tested.
>
> Co-developed-by: Bean Huo <beanhuo@...ron.com>
> Signed-off-by: Bean Huo <beanhuo@...ron.com>
> Signed-off-by: Kimito Sakata <kimito.sakata@...cle.com>
> Reviewed-by: Kenneth Gibbons <kenny.gibbons@...cle.com>
>
> Changelog:
> v2--v3:
> 1. Remove redundant ifndef
>
> 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 | 130
> +++++++++++++++++++++++++++++++++++++++++++++++++++++
> mmc_cmds.h | 1 +
> 4 files changed, 151 insertions(+), 1 deletion(-)
>
> diff --git a/mmc.c b/mmc.c
> index f3d724b..eb2638b 100644
> --- a/mmc.c
> +++ b/mmc.c
> @@ -229,6 +229,14 @@ static struct Command commands[] = {
> "Run Field Firmware Update with <image name> on <device>.\n",
> NULL
> },
> + { do_erase, -4,
> + "erase", "<type> " "<start address> " "<end address> " "<device>\n"
> + "Send Erase CMD38 with specific argument to the <device>\n\n"
> + "NOTE!: This will delete all user data in the specified region of the
> device\n"
> + "<type> 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 5754a9d..e9766d7 100644
> --- a/mmc.h
> +++ b/mmc.h
> @@ -35,7 +35,15 @@
> #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
> */
> @@ -62,6 +70,7 @@
> #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
> @@ -190,6 +199,8 @@
> #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 6c24cea..24f80db 100644
> --- a/mmc_cmds.c
> +++ b/mmc_cmds.c
> @@ -2514,6 +2514,136 @@ 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)
> +{
> + int ret = 0;
> + struct mmc_ioc_multi_cmd *multi_cmd;
> +
> + multi_cmd = calloc(1, sizeof(struct mmc_ioc_multi_cmd) +
> + 3 * sizeof(struct mmc_ioc_cmd));
> + if (!multi_cmd) {
> + perror("Failed to allocate memory");
> + return -ENOMEM;
> + }
I am missing reference to ERASE_GROUP_DEF.
It affects the timeout, size of erase group etc.
Don't you need to query for before starting to build the command?
> +
> + multi_cmd->num_of_cmds = 3;
> + /* Set erase start address */
> + multi_cmd->cmds[0].opcode = MMC_ERASE_GROUP_START;
> + multi_cmd->cmds[0].arg = start;
> + multi_cmd->cmds[0].flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 |
> MMC_CMD_AC;
> + multi_cmd->cmds[0].write_flag = 1;
> +
> + /* Set erase end address */
> + multi_cmd->cmds[1].opcode = MMC_ERASE_GROUP_END;
> + multi_cmd->cmds[1].arg = end;
> + multi_cmd->cmds[1].flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 |
> MMC_CMD_AC;
> + multi_cmd->cmds[1].write_flag = 1;
> +
> + /* Send Erase Command */
> + multi_cmd->cmds[2].opcode = MMC_ERASE;
> + multi_cmd->cmds[2].arg = argin;
> + multi_cmd->cmds[2].cmd_timeout_ms = 300*255*255;
> + multi_cmd->cmds[2].flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B |
> MMC_CMD_AC;
> + multi_cmd->cmds[2].write_flag = 1;
> +
> + /* send erase cmd with multi-cmd */
> + ret = ioctl(dev_fd, MMC_IOC_MULTI_CMD, multi_cmd);
> + if (ret)
> + perror("Erase multi-cmd ioctl");
> +
> + free(multi_cmd);
> + return ret;
> +#endif
> +}
> +
> +int do_erase(int nargs, char **argv)
> +{
> + int dev_fd, ret;
> + char *print_str;
> + char **eptr = NULL;
> + __u8 ext_csd[512], checkup_mask = 0;
> + __u32 arg, start, end;
> +
> + if (nargs != 5) {
> + fprintf(stderr, "Usage: erase <type> <start addr> <end addr>
> </path/to/mmcblkX>\n");
> + exit(1);
> + }
> +
> + if (strstr(argv[2], "0x") || strstr(argv[2], "0X"))
> + start = strtol(argv[2], eptr, 16);
> + else
> + start = strtol(argv[2], eptr, 10);
> +
> + if (strstr(argv[3], "0x") || strstr(argv[3], "0X"))
> + end = strtol(argv[3], eptr, 16);
> + else
> + end = strtol(argv[3], eptr, 10);
You are not really using eptr - maybe just call strtol with NULL?
> +
> + if (end < start) {
> + fprintf(stderr, "erase start [0x%08x] > erase end [0x%08x]\n",
> + start, end);
> + exit(1);
> + }
Start & End are in bytes for media < 2GB, and in sectors for media >=2GB.
Should also check for legal erase group restrictions.
> +
> + if (strcmp(argv[1], "legacy") == 0) {
> + arg = 0x00000000;
> + print_str = "Legacy Erase";
> + } else if (strcmp(argv[1], "discard") == 0) {
> + arg = 0x00000003;
> + print_str = "Discard";
> + } else if (strcmp(argv[1], "secure-erase") == 0) {
> + print_str = "Secure Erase";
> + checkup_mask = EXT_CSD_SEC_ER_EN;
> + arg = 0x80000000;
> + } else if (strcmp(argv[1], "secure-trim1") == 0) {
> + print_str = "Secure Trim Step 1";
> + checkup_mask = EXT_CSD_SEC_ER_EN | EXT_CSD_SEC_GB_CL_EN;
> + arg = 0x80000001;
> + } else if (strcmp(argv[1], "secure-trim2") == 0) {
> + print_str = "Secure Trim Step 2";
> + checkup_mask = EXT_CSD_SEC_ER_EN | EXT_CSD_SEC_GB_CL_EN;
> + arg = 0x80008000;
> + } else if (strcmp(argv[1], "trim") == 0) {
> + print_str = "Trim";
> + checkup_mask = EXT_CSD_SEC_GB_CL_EN;
> + arg = 0x00000001;
> + } else {
> + fprintf(stderr, "Unknown erase type: %s\n", argv[1]);
> + exit(1);
> + }
Maybe use an enum for the erase type to avoid the strcmp?
Then need to update the usage message.
> +
> + dev_fd = open(argv[4], O_RDWR);
> + if (dev_fd < 0) {
> + perror(argv[4]);
> + exit(1);
> + }
How do you differentiate between mmc and SD devices?
And for SD you should send different commands(35/36 vs. 32/33).
Do you intend to support SD devices as well? In another patch?
> +
> + if (checkup_mask) {
> + ret = read_extcsd(dev_fd, ext_csd);
> + if (ret) {
> + fprintf(stderr, "Could not read EXT_CSD from %s\n",
> + argv[4]);
> + goto out;
> + }
> + if ((checkup_mask & ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]) !=
> + checkup_mask) {
> + fprintf(stderr, "%s is not supported in %s\n",
> + print_str, argv[4]);
> + ret = -ENOTSUP;
> + goto out;
> + }
EXT_CSD_SEC_FEATURE_SUPPORT might also contains the sanitize bit,
as well as reserved bits that you shouldn't assume they are 0, so I am not sure that this condition is correct.
The checkup only refers to bit 0 and bit 4 - maybe add a helper that accept &args and returns 0 if allowed...
Thanks,
Avri
> +
> + }
> + printf("Executing %s from 0x%08x to 0x%08x\n", print_str, start, end);
> +
> + ret = erase(dev_fd, arg, start, end);
> +out:
> + printf(" %s %s!\n\n", print_str, ret ? "Failed" : "Succeed");
> + close(dev_fd);
> + return ret;
> +}
> +
> +
> int do_ffu(int nargs, char **argv)
> {
> #ifndef MMC_IOC_MULTI_CMD
> diff --git a/mmc_cmds.h b/mmc_cmds.h
> index 9d3246c..8331ab2 100644
> --- a/mmc_cmds.h
> +++ b/mmc_cmds.h
> @@ -45,3 +45,4 @@ int do_ffu(int nargs, char **argv);
> int do_read_scr(int argc, char **argv);
> int do_read_cid(int argc, char **argv);
> int do_read_csd(int argc, char **argv);
> +int do_erase(int nargs, char **argv);
> --
> 2.24.1 (Apple Git-126)
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