RE: [PATCH v2] mmc: card: Adding support for sanitize in eMMC 4.5

From: merez
Date: Thu Apr 18 2013 - 06:28:36 EST

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In reply to: Luca Porzio (lporzio): "RE: [PATCH v2] mmc: card: Adding support for sanitize in eMMC 4.5"
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Hi Luca,

See below (2 comments).

Thanks,
Maya
> Hi Maya,
>
>> -----Original Message-----
>> From: linux-mmc-owner@xxxxxxxxxxxxxxx [mailto:linux-mmc-
>> owner@xxxxxxxxxxxxxxx] On Behalf Of Maya Erez
>> Sent: Wednesday, April 17, 2013 1:39 PM
>> To: linux-mmc@xxxxxxxxxxxxxxx
>> Cc: linux-arm-msm@xxxxxxxxxxxxxxx; Maya Erez; Yaniv Gardi; open list
>> Subject: [PATCH v2] mmc: card: Adding support for sanitize in eMMC 4.5
>>
>> The sanitize support is added as a user-app ioctl call, and
>> was removed from the block-device request, since its purpose is
>> to be invoked not via File-System but by a user.
>> This feature deletes the unmap memory region of the eMMC card,
>> by writing to a specific register in the EXT_CSD.
>> unmap region is the memory region that was previously deleted
>> (by erase, trim or discard operation).
>> In order to avoid timeout when sanitizing large-scale cards,
>> the timeout for sanitize operation is 240 seconds.
>>
>> Signed-off-by: Yaniv Gardi <ygardi@xxxxxxxxxxxxxx>
>> Signed-off-by: Maya Erez <merez@xxxxxxxxxxxxxx>
>> ---
>> drivers/mmc/card/block.c | 68
>> +++++++++++++++++++++++++++++++-----------
>> ---
>> drivers/mmc/card/queue.c | 2 +-
>> drivers/mmc/core/core.c | 21 ++++++++++++++
>> include/linux/mmc/core.h | 2 +
>> include/linux/mmc/host.h | 1 +
>> 5 files changed, 72 insertions(+), 22 deletions(-)
>>
>> diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
>> index e12a03c..1f043ee 100644
>> --- a/drivers/mmc/card/block.c
>> +++ b/drivers/mmc/card/block.c
>> @@ -58,6 +58,8 @@ MODULE_ALIAS("mmc:block");
>> #define INAND_CMD38_ARG_SECTRIM1 0x81
>> #define INAND_CMD38_ARG_SECTRIM2 0x88
>> #define MMC_BLK_TIMEOUT_MS (10 * 60 * 1000) /* 10 minute
>> timeout
>> */
>> +#define MMC_SANITIZE_REQ_TIMEOUT 240000
>> +#define MMC_EXTRACT_INDEX_FROM_ARG(x) ((x & 0x00FF0000) >> 16)
>>
>> #define mmc_req_rel_wr(req) (((req->cmd_flags & REQ_FUA) || \
>> (req->cmd_flags & REQ_META)) && \
>> @@ -409,6 +411,35 @@ static int ioctl_rpmb_card_status_poll(struct
>> mmc_card
>> *card, u32 *status,
>> return err;
>> }
>>
>> +static int ioctl_do_sanitize(struct mmc_card *card)
>> +{
>> + int err;
>> +
>> + if (!(mmc_can_sanitize(card) &&
>> + (card->host->caps2 & MMC_CAP2_SANITIZE))) {
>> + pr_warn("%s: %s - SANITIZE is not supported\n",
>> + mmc_hostname(card->host), __func__);
>> + err = -EOPNOTSUPP;
>> + goto out;
>> + }
>> +
>> + pr_debug("%s: %s - SANITIZE IN PROGRESS...\n",
>> + mmc_hostname(card->host), __func__);
>> +
>> + err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
>> + EXT_CSD_SANITIZE_START, 1,
>> + MMC_SANITIZE_REQ_TIMEOUT);
>> +
>> + if (err)
>
> Shouldn't you set the sanitize_busy flag here in case of timeout error?
> Otherwise the patch looks good to me
>
> Thanks,
> Luca

This is done in __mmc_switch.
I sent an uncomplete patch by mistake. Good catch!

>
>> + pr_err("%s: %s - EXT_CSD_SANITIZE_START failed. err=%d\n",
>> + mmc_hostname(card->host), __func__, err);
>> +
>> + pr_debug("%s: %s - SANITIZE COMPLETED\n", mmc_hostname(card->host),
>> + __func__);
>> +out:
>> + return err;
>> +}
>> +
>> static int mmc_blk_ioctl_cmd(struct block_device *bdev,
>> struct mmc_ioc_cmd __user *ic_ptr)
>> {
>> @@ -511,6 +542,16 @@ static int mmc_blk_ioctl_cmd(struct block_device
>> *bdev,
>> goto cmd_rel_host;
>> }
>>
>> + if (MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_SANITIZE_START) {
>> + err = ioctl_do_sanitize(card);
>> +
>> + if (err)
>> + pr_err("%s: ioctl_do_sanitize() failed. err = %d",
>> + __func__, err);
>> +
>> + goto cmd_rel_host;
>> + }
>> +
>> mmc_wait_for_req(card->host, &mrq);
>>
>> if (cmd.error) {
>> @@ -940,10 +981,10 @@ static int mmc_blk_issue_secdiscard_rq(struct
>> mmc_queue *mq,
>> {
>> struct mmc_blk_data *md = mq->data;
>> struct mmc_card *card = md->queue.card;
>> - unsigned int from, nr, arg, trim_arg, erase_arg;
>> + unsigned int from, nr, arg;
>> int err = 0, type = MMC_BLK_SECDISCARD;
>>
>> - if (!(mmc_can_secure_erase_trim(card) || mmc_can_sanitize(card))) {
>> + if (!(mmc_can_secure_erase_trim(card))) {
>> err = -EOPNOTSUPP;
>> goto out;
>> }
>> @@ -951,23 +992,11 @@ static int mmc_blk_issue_secdiscard_rq(struct
>> mmc_queue *mq,
>> from = blk_rq_pos(req);
>> nr = blk_rq_sectors(req);
>>
>> - /* The sanitize operation is supported at v4.5 only */
>> - if (mmc_can_sanitize(card)) {
>> - erase_arg = MMC_ERASE_ARG;
>> - trim_arg = MMC_TRIM_ARG;
>> - } else {
>> - erase_arg = MMC_SECURE_ERASE_ARG;
>> - trim_arg = MMC_SECURE_TRIM1_ARG;
>> - }
>> + if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr))
>> + arg = MMC_SECURE_TRIM1_ARG;
>> + else
>> + arg = MMC_SECURE_ERASE_ARG;
>>
>> - if (mmc_erase_group_aligned(card, from, nr))
>> - arg = erase_arg;
>> - else if (mmc_can_trim(card))
>> - arg = trim_arg;
>> - else {
>> - err = -EINVAL;
>> - goto out;
>> - }
>> retry:
>> if (card->quirks & MMC_QUIRK_INAND_CMD38) {
>> err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
>> @@ -1003,9 +1032,6 @@ retry:
>> goto out;
>> }
>>
>> - if (mmc_can_sanitize(card))
>> - err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
>> - EXT_CSD_SANITIZE_START, 1, 0);
>> out_retry:
>> if (err && !mmc_blk_reset(md, card->host, type))
>> goto retry;
>> diff --git a/drivers/mmc/card/queue.c b/drivers/mmc/card/queue.c
>> index 9447a0e..fa9632e 100644
>> --- a/drivers/mmc/card/queue.c
>> +++ b/drivers/mmc/card/queue.c
>> @@ -173,7 +173,7 @@ static void mmc_queue_setup_discard(struct
>> request_queue *q,
>> /* granularity must not be greater than max. discard */
>> if (card->pref_erase > max_discard)
>> q->limits.discard_granularity = 0;
>> - if (mmc_can_secure_erase_trim(card) || mmc_can_sanitize(card))
>> + if (mmc_can_secure_erase_trim(card))
>> queue_flag_set_unlocked(QUEUE_FLAG_SECDISCARD, q);
>> }
>>
>> diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
>> index 37c5dad..dea9381 100644
>> --- a/drivers/mmc/core/core.c
>> +++ b/drivers/mmc/core/core.c
>> @@ -402,6 +402,27 @@ static int mmc_wait_for_data_req_done(struct
>> mmc_host
>> *host,
>> context_info->is_done_rcv = false;
>> context_info->is_new_req = false;
>> cmd = mrq->cmd;
>> +
>> + /*
>> + * If host has timed out waiting for the sanitize
>> + * to complete, card might be still in programming state
>> + * so let's try to bring the card out of programming
>> + * state.
>> + */
>> + if (cmd->sanitize_busy && cmd->error == -ETIMEDOUT) {
>> + if (!mmc_interrupt_hpi(host->card)) {
>> + pr_warning("%s: %s: Interrupted "
>> + "sanitize\n",
>> + mmc_hostname(host),
>> + __func__);
>> + cmd->error = 0;
>> + break;
>> + } else {
>> + pr_err("%s: %s: Failed to interrupt "
>> + "sanitize\n",
>> + mmc_hostname(host), __func__);
>> + }
>> + }
This should be moved to mmc_wait_for_req_done. Sorry for the mistake.
Will send a new patch with the fix.

>> if (!cmd->error || !cmd->retries ||
>> mmc_card_removed(host->card)) {
>> err = host->areq->err_check(host->card,
>> diff --git a/include/linux/mmc/core.h b/include/linux/mmc/core.h
>> index 39613b9..bd06ff5 100644
>> --- a/include/linux/mmc/core.h
>> +++ b/include/linux/mmc/core.h
>> @@ -96,6 +96,8 @@ struct mmc_command {
>> */
>>
>> unsigned int cmd_timeout_ms; /* in milliseconds */
>> + /* Set this flag only for blocking sanitize request */
>> + bool sanitize_busy;
>>
>> struct mmc_data *data; /* data segment associated
>> with cmd */
>> struct mmc_request *mrq; /* associated request */
>> diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
>> index e326ae2..00c10be 100644
>> --- a/include/linux/mmc/host.h
>> +++ b/include/linux/mmc/host.h
>> @@ -281,6 +281,7 @@ struct mmc_host {
>> #define MMC_CAP2_PACKED_CMD (MMC_CAP2_PACKED_RD | \
>> MMC_CAP2_PACKED_WR)
>> #define MMC_CAP2_NO_PRESCAN_POWERUP (1 << 14) /* Don't power up before
>> scan */
>> +#define MMC_CAP2_SANITIZE (1 << 15) /* Support Sanitize */
>>
>> mmc_pm_flag_t pm_caps; /* supported pm features */
>>
>> --
>> 1.7.3.3
>> --
>> QUALCOMM ISRAEL, on behalf of Qualcomm Innovation Center, Inc. is a
>> member
>> of Code Aurora Forum, hosted by The Linux Foundation
>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-mmc" in
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> --
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>

--
Maya Erez
QUALCOMM ISRAEL, on behalf of Qualcomm Innovation Center, Inc. is a member
of Code Aurora Forum, hosted by The Linux Foundation

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Next message: Lee Jones: "[PATCH 6/9] crypto: ux500/cryp - Set DMA configuration though dma_slave_config()"
Previous message: Lee Jones: "[PATCH 9/9] ARM: ux500: Register Cyrp and Hash platform drivers on Snowball"
In reply to: Luca Porzio (lporzio): "RE: [PATCH v2] mmc: card: Adding support for sanitize in eMMC 4.5"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]