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Message-ID: <20210825053644.GA2869@nishad>
Date: Wed, 25 Aug 2021 11:06:46 +0530
From: Nishad Kamdar <nishadkamdar@...il.com>
To: Avri Altman <Avri.Altman@....com>,
Ulf Hansson <ulf.hansson@...aro.org>,
Jens Axboe <axboe@...nel.dk>,
Adrian Hunter <adrian.hunter@...el.com>,
Bean Huo <beanhuo@...ron.com>,
Shawn Lin <shawn.lin@...k-chips.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] mmc: core: Return correct emmc response in case of
ioctl error
On Mon, Aug 09, 2021 at 08:41:19AM +0000, Avri Altman wrote:
> > When a read/write command is sent via ioctl to the kernel,
> > and the command fails, the actual error response of the emmc
> > is not sent to the user.
> >
> > Following are the tests carried out using commands
> > 17 (Single BLock Read),
> > 24 (Single Block Write),
> > 18 (Multi Block Read),
> > 25 (Multi Block Write)
> >
> > The tests are carried out on a 64Gb emmc device. All of these
> > tests try to access an "out of range" sector address (0x09B2FFFF).
> >
> > It is seen that without the patch the response received by the user
> > is not OUT_OF_RANGE error (R1 response 31st bit is not set) as per
> > JEDEC specification. After applying the patch proper response is seen.
> >
> > The user level ioctl testcode for the above commands and their
> > respective outputs without and with the patch are shown below:
> >
> > CMD17 (Test Code Snippet):
> > ==========================
> > printf("Forming CMD%d\n", opt_idx);
> > /* single block read */
> > cmd.blksz = 512;
> > cmd.blocks = 1;
> > cmd.write_flag = 0;
> > cmd.opcode = 17;
> > //cmd.arg = atoi(argv[3]);
> > cmd.arg = 0x09B2FFFF;
> > /* Expecting response R1B */
> > cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
> >
> > memset(data, 0, sizeof(__u8) * 512);
> > mmc_ioc_cmd_set_data(cmd, data);
> >
> > printf("Sending CMD%d: ARG[0x%08x]\n", opt_idx, cmd.arg);
> > if(ioctl(fd, MMC_IOC_CMD, &cmd))
> > perror("Error");
> >
> > printf("\nResponse: %08x\n", cmd.response[0]);
> >
> > CMD17 (Output without patch):
> > =============================
> > test@...t-LIVA-Z:~$ sudo ./mmc cmd_test /dev/mmcblk0 17 09B2FFFF
> No need for arg 3 - you are hardcoded overriding it.
>
> > Entering the do_mmc_commands:Device: /dev/mmcblk0 nargs:4
> > Entering the do_mmc_commands:Device: /dev/mmcblk0 options[17,
> > 0x09B2FFF]
> > Forming CMD17
> > Sending CMD17: ARG[0x09b2ffff]
> > Error: Connection timed out
> >
> > Response: 00000000 (Wrong response)
> >
> > CMD17 (Output with patch):
> > ==========================
> > test@...t-LIVA-Z:~$ sudo ./mmc cmd_test /dev/mmcblk0 17 09B2FFFF
> > [sudo] password for test:
> > Entering the do_mmc_commands:Device: /dev/mmcblk0 nargs:4
> > Entering the do_mmc_commands:Device: /dev/mmcblk0 options[17, 09B2FFFF]
> > Forming CMD17
> > Sending CMD17: ARG[0x09b2ffff]
> > Error: Connection timed out
> >
> > Response: 80000900
> > (Correct OUT_OF_ERROR response as per JEDEC specification)
>
>
> >
> > CMD24 (Test Code Snippet):
> > ==========================
> > printf("Forming CMD%d\n", opt_idx);
> > cmd.opcode = 24;
> > //cmd.arg = atoi(argv[3]);
> > cmd.arg = 0x09B2FFFF;
> > cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
> > cmd.blksz = 512;
> > cmd.blocks = 1;
> > cmd.write_flag = 1;
> >
> > memset(data, 0xA5, sizeof(__u8) * 512);
> > mmc_ioc_cmd_set_data(cmd, data);
> >
> > printf("Sending CMD%d: ARG[0x%08x]\n", opt_idx, cmd.arg);
> > if(ioctl(fd, MMC_IOC_CMD, &cmd))
> > perror("Error");
> >
> > printf("\nResponse: %08x\n", cmd.response[0]);
> >
> > CMD24 (Output without patch):
> > =============================
> > test@...t-LIVA-Z:~$ sudo ./mmc cmd_test /dev/mmcblk0 24 0x09B2FFF
> > [sudo] password for test:
> > Entering the do_mmc_commands:Device: /dev/mmcblk0 nargs:4
> > Entering the do_mmc_commands:Device: /dev/mmcblk0 options[24,
> > 0x09B2FFF]
> > Forming CMD24
> > Sending CMD24: ARG[0x09b2ffff]
> > Error: Connection timed out
> >
> > Response: 00000000 (Incorrect response)
> >
> > CMD24 (Output with patch):
> > ==========================
> > test@...t-LIVA-Z:~$ sudo ./mmc cmd_test /dev/mmcblk0 24 09B2FFFF
> > Entering the do_mmc_commands:Device: /dev/mmcblk0 nargs:4
> > Entering the do_mmc_commands:Device: /dev/mmcblk0 options[24, 09B2FFFF]
> > Forming CMD24
> > Sending CMD24: ARG[0x09b2ffff]
> > Error: Connection timed out
> >
> > Response: 80000900
> > (Correct OUT_OF_RANGE response as per JEDEC specification)
> >
> > CMD18 (Test Code Snippet):
> > ==========================
> > printf("Forming CMD%d\n", opt_idx);
> >
> > cmd.blksz = 512;
> > cmd.blocks = 1;
> > cmd.write_flag = 0;
> > cmd.opcode = 18;
> > //cmd.arg = atoi(argv[3]);
> > cmd.arg = 0x09B2FFFF;
> >
> > cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
> >
> > memset(data, 0, sizeof(__u8) * 512);
> > mmc_ioc_cmd_set_data(cmd, data);
> >
> > printf("Sending CMD%d: ARG[0x%08x]\n", opt_idx, cmd.arg);
> > if(ioctl(fd, MMC_IOC_CMD, &cmd)) {
> > printf(" error ioctl \n");
> > perror("Error");
> > }
> >
> > printf("\nResponse: %08x\n", cmd.response[0]);
> >
> > CMD18 (Output without patch):
> > =============================
> > test@...t-LIVA-Z:~$ sudo ./mmc cmd_test /dev/mmcblk0 18 0x09B2FFF
> > Entering the do_mmc_commands:Device: /dev/mmcblk0 nargs:4
> > Entering the do_mmc_commands:Device: /dev/mmcblk0 options[18,
> > 0x09B2FFF]
> > Forming CMD18
> > Sending CMD18: ARG[0x09b2ffff]
> > error ioctl
> > Error: Connection timed out
> >
> > Response: 00000000 (Incorrect response)
> >
> > CMD18 (Output with patch):
> > ==========================
> > test@...t-LIVA-Z:~$ sudo ./mmc cmd_test /dev/mmcblk0 18 09B2FFFF
> > Entering the do_mmc_commands:Device: /dev/mmcblk0 nargs:4
> > Entering the do_mmc_commands:Device: /dev/mmcblk0 options[18, 09B2FFFF]
> > Forming CMD18
> > Sending CMD18: ARG[0x09b2ffff]
> > error ioctl
> > Error: Connection timed out
> >
> > Response: 80000900
> > (Correct OUT_OF_RANGE response as per JEDEC specification)
> >
> > CMD25 (Test Code Snippet):
> > ==========================
> > printf("Forming CMD%d\n", opt_idx);
> > cmd.opcode = 25;
> > //cmd.arg = atoi(argv[3]);
> > cmd.arg = 0x09B2FFFF;
> > cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
> >
> > cmd.blksz = 512;
> > cmd.blocks = 1;
> > cmd.write_flag = 1;
> >
> > memset(data, 0xA5, sizeof(__u8) * 512);
> > mmc_ioc_cmd_set_data(cmd, data);
> >
> > printf("Sending CMD%d: ARG[0x%08x]\n", opt_idx, cmd.arg);
> > if(ioctl(fd, MMC_IOC_CMD, &cmd)) {
> > printf("\nerror ioctl\n");
> > perror("Error");
> > }
> >
> > printf("\nResponse: %08x\n", cmd.response[0]);
> >
> > CMD25 (Output without patch):
> > =============================
> > test@...t-LIVA-Z:~$ sudo ./mmc cmd_test /dev/mmcblk0 25 0x09B2FFF
> > Entering the do_mmc_commands:Device: /dev/mmcblk0 nargs:4
> > Entering the do_mmc_commands:Device: /dev/mmcblk0 options[25,
> > 0x09B2FFF]
> > Forming CMD25
> > Sending CMD25: ARG[0x09b2ffff]
> >
> > error ioctl
> > Error: Connection timed out
> >
> > Response: 00000000 (Incorrect response)
> >
> > CMD25 (Output with patch):
> > ==========================
> > test@...t-LIVA-Z:~$ sudo ./mmc cmd_test /dev/mmcblk0 25 09B2FFFF
> > Entering the do_mmc_commands:Device: /dev/mmcblk0 nargs:4
> > Entering the do_mmc_commands:Device: /dev/mmcblk0 options[25, 09B2FFFF]
> > Forming CMD25
> > Sending CMD25: ARG[0x09b2ffff]
> >
> > error ioctl
> > Error: Connection timed out
> >
> > Response: 80000900
> > (Correct OUT_OF_RANGE response as per JEDEC specification)
> >
> > Signed-off-by: Nishad Kamdar <nishadkamdar@...il.com>
> Reviewed-by: Avri Altman <avri.altman@....com>
>
> > ---
> > Changes in v2:
> > - Make commit message clearer by adding test cases as outputs
> A little overwhelming IMO
>
Ok, Thanks for the review and comments.
Regards,
Nishad
> >
> > drivers/mmc/core/block.c | 2 ++
> > 1 file changed, 2 insertions(+)
> >
> > diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
> > index a9ad9f5fa9491..efa92aa7e2368 100644
> > --- a/drivers/mmc/core/block.c
> > +++ b/drivers/mmc/core/block.c
> > @@ -522,11 +522,13 @@ static int __mmc_blk_ioctl_cmd(struct mmc_card
> > *card, struct mmc_blk_data *md,
> > if (cmd.error) {
> > dev_err(mmc_dev(card->host), "%s: cmd error %d\n",
> > __func__, cmd.error);
> > + memcpy(&idata->ic.response, cmd.resp, sizeof(cmd.resp));
> > return cmd.error;
> > }
> > if (data.error) {
> > dev_err(mmc_dev(card->host), "%s: data error %d\n",
> > __func__, data.error);
> > + memcpy(&idata->ic.response, cmd.resp, sizeof(cmd.resp));
> > return data.error;
> > }
> >
> > --
> > 2.17.1
>
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