[PATCH v6 8/9] mmc: block: register RPMB partition with the RPMB subsystem

Tomas Winkler
2016-09-13T13:23:03Z

Register eMMC RPMB partition with the RPMB subsystem and provide
implementation for the RPMB access operations abstracting
actual multi step process.

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
---
V2: resend
V3: commit message fix
V4: Kconfig: use select RPMB to ensure valid configuration
Switch back to main area after RPMB access
V5: Revamp code using new sequence command
Support for 8K packets in e.MMC v5.1
V5: resend

drivers/mmc/card/Kconfig | 1 +
drivers/mmc/card/block.c | 258 ++++++++++++++++++++++++++++++++++++++++++++++-
2 files changed, 256 insertions(+), 3 deletions(-)

diff --git a/drivers/mmc/card/Kconfig b/drivers/mmc/card/Kconfig
index 5562308699bc..537d0bc82781 100644
--- a/drivers/mmc/card/Kconfig
+++ b/drivers/mmc/card/Kconfig
@@ -7,6 +7,7 @@ comment "MMC/SD/SDIO Card Drivers"
config MMC_BLOCK
tristate "MMC block device driver"
depends on BLOCK
+ select RPMB
default y
help
Say Y here to enable the MMC block device driver support.
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index 2206d4477dbb..51d7e60226f5 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -42,6 +42,7 @@
#include <linux/mmc/host.h>
#include <linux/mmc/mmc.h>
#include <linux/mmc/sd.h>
+#include <linux/rpmb.h>

#include <asm/uaccess.h>

@@ -111,6 +112,7 @@ struct mmc_blk_data {
#define MMC_BLK_WRITE BIT(1)
#define MMC_BLK_DISCARD BIT(2)
#define MMC_BLK_SECDISCARD BIT(3)
+#define MMC_BLK_RPMB BIT(4)

/*
* Only set in main mmc_blk_data associated
@@ -401,8 +403,8 @@ static int mmc_blk_ioctl_copy_to_user(struct mmc_ioc_cmd __user *ic_ptr,
return 0;
}

-static int ioctl_rpmb_card_status_poll(struct mmc_card *card, u32 *status,
- u32 retries_max)
+static int mmc_blk_rpmb_status_poll(struct mmc_card *card, u32 *status,
+ u32 retries_max)
{
int err;
u32 retry_count = 0;
@@ -575,7 +577,7 @@ static int __mmc_blk_ioctl_cmd(struct mmc_card *card, struct mmc_blk_data *md,
* Ensure RPMB command has completed by polling CMD13
* "Send Status".
*/
- err = ioctl_rpmb_card_status_poll(card, &status, 5);
+ err = mmc_blk_rpmb_status_poll(card, &status, 5);
if (err)
dev_err(mmc_dev(card->host),
"%s: Card Status=0x%08X, error %d\n",
@@ -1165,6 +1167,252 @@ int mmc_access_rpmb(struct mmc_queue *mq)
return false;
}

+static int mmc_rpmb_send_cmd(struct mmc_card *card,
+ unsigned int data_type, bool do_rel_wr,
+ void *buf, u16 blks)
+{
+ int err;
+ u32 status;
+ struct mmc_command sbc = {
+ .opcode = MMC_SET_BLOCK_COUNT,
+ .flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC,
+ };
+
+ struct mmc_command cmd = {
+ .flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC,
+ };
+
+ struct mmc_data data = {
+ .blksz = 512,
+ };
+ struct mmc_request mrq = {
+ .sbc = &sbc,
+ .cmd = &cmd,
+ .data = &data,
+ .stop = NULL,
+ };
+ struct scatterlist sg;
+
+ /* set CMD23 */
+ sbc.arg = blks & 0x0000FFFF;
+ if (do_rel_wr)
+ sbc.arg |= MMC_CMD23_ARG_REL_WR;
+
+ /* set CMD25/18 */
+ cmd.opcode = (data_type == MMC_DATA_WRITE) ?
+ MMC_WRITE_MULTIPLE_BLOCK : MMC_READ_MULTIPLE_BLOCK;
+
+ sg_init_one(&sg, buf, 512 * blks);
+
+ data.blocks = blks;
+ data.sg = &sg;
+ data.sg_len = 1;
+ data.flags = data_type;
+ mmc_set_data_timeout(&data, card);
+
+ mmc_wait_for_req(card->host, &mrq);
+
+ if (cmd.error) {
+ dev_err(mmc_dev(card->host), "cmd error (%d)\n", cmd.error);
+ return cmd.error;
+ }
+
+ if (data.error) {
+ dev_err(mmc_dev(card->host), "data error (%d)\n", data.error);
+ return data.error;
+ }
+
+ err = mmc_blk_rpmb_status_poll(card, &status, 5);
+ if (err)
+ dev_err(mmc_dev(card->host), "Card Status=0x%08X, error %d\n",
+ status, err);
+ return err;
+}
+
+static int mmc_blk_rpmb_sequence(struct mmc_card *card,
+ struct rpmb_cmd *cmds, u32 ncmds)
+{
+ int err, i;
+ struct rpmb_cmd *cmd;
+ unsigned int data_type;
+ bool do_rel_wr;
+
+ for (err = 0, i = 0; i < ncmds && !err; i++) {
+ cmd = &cmds[i];
+ if (cmd->flags & RPMB_F_WRITE) {
+ data_type = MMC_DATA_WRITE;
+ do_rel_wr = !!(cmd->flags & RPMB_F_REL_WRITE);
+ } else {
+ data_type = MMC_DATA_READ;
+ do_rel_wr = false;
+ }
+
+ err = mmc_rpmb_send_cmd(card, data_type, do_rel_wr,
+ cmd->frames, cmd->nframes);
+ }
+
+ return err;
+}
+
+static int mmc_blk_rpmb_process(struct mmc_blk_data *md,
+ struct rpmb_cmd *cmds, u32 ncmds)
+{
+ struct mmc_card *card;
+ int ret;
+
+ if (WARN_ON(!md || !cmds || !ncmds))
+ return -EINVAL;
+
+ if (!(md->flags & MMC_BLK_CMD23) ||
+ (md->part_type != EXT_CSD_PART_CONFIG_ACC_RPMB))
+ return -EOPNOTSUPP;
+
+ card = md->queue.card;
+ if (!card || !mmc_card_mmc(card))
+ return -ENODEV;
+
+ mmc_get_card(card);
+
+ /* switch to RPMB partition */
+ ret = mmc_blk_part_switch(card, md);
+ if (ret) {
+ dev_err(mmc_dev(card->host), "Invalid RPMB partition switch (%d)!\n",
+ ret);
+ /*
+ * In case partition is not in user data area, make
+ * a force partition switch.
+ * we need reset eMMC card at here
+ */
+ ret = mmc_blk_reset(md, card->host, MMC_BLK_RPMB);
+ if (!ret)
+ mmc_blk_reset_success(md, MMC_BLK_RPMB);
+ else
+ dev_err(mmc_dev(card->host), "eMMC card reset failed (%d)\n",
+ ret);
+ goto out;
+ }
+
+ ret = mmc_blk_rpmb_sequence(card, cmds, ncmds);
+ if (ret)
+ dev_err(mmc_dev(card->host), "failed (%d) to handle RPMB request\n",
+ ret);
+
+ /* Always switch back to main area after RPMB access */
+ mmc_blk_part_switch(card, dev_get_drvdata(&card->dev));
+out:
+ mmc_put_card(card);
+ return ret;
+}
+
+static int mmc_blk_rpmb_cmd_seq(struct device *dev,
+ struct rpmb_cmd *cmds, u32 ncmds)
+{
+ struct mmc_blk_data *md;
+ int ret;
+
+ md = mmc_blk_get(dev_to_disk(dev));
+ if (!md)
+ return -ENODEV;
+
+ if (!cmds || !ncmds)
+ return -EINVAL;
+
+ ret = mmc_blk_rpmb_process(md, cmds, ncmds);
+
+ mmc_blk_put(md);
+
+ return ret;
+}
+
+static struct rpmb_ops mmc_rpmb_dev_ops = {
+ .cmd_seq = mmc_blk_rpmb_cmd_seq,
+ .type = RPMB_TYPE_EMMC,
+};
+
+static struct mmc_blk_data *mmc_blk_rpmb_part_get(struct mmc_blk_data *md)
+{
+ struct mmc_blk_data *part_md;
+
+ if (!md)
+ return NULL;
+
+ list_for_each_entry(part_md, &md->part, part) {
+ if (part_md->area_type == MMC_BLK_DATA_AREA_RPMB)
+ return part_md;
+ }
+
+ return NULL;
+}
+
+static void mmc_blk_rpmb_unset_dev_id(struct rpmb_ops *ops)
+{
+ kfree(ops->dev_id);
+ ops->dev_id = NULL;
+}
+
+static int mmc_blk_rpmb_set_dev_id(struct rpmb_ops *ops, struct mmc_card *card)
+{
+ char *id;
+
+ id = kmalloc(sizeof(card->raw_cid), GFP_KERNEL);
+ if (!id)
+ return -ENOMEM;
+
+ memcpy(id, card->raw_cid, sizeof(card->raw_cid));
+ ops->dev_id = id;
+ ops->dev_id_len = sizeof(card->raw_cid);
+
+ return 0;
+}
+
+static void mmc_blk_rpmb_set_rel_wr_cnt(struct rpmb_ops *ops,
+ struct mmc_card *card)
+{
+ u16 rel_wr_cnt;
+
+ /* RPMB blocks are written in half sectors hence '* 2' */
+ rel_wr_cnt = card->ext_csd.rel_sectors * 2;
+ /* eMMC 5.1 may support RPMB 8K (32) frames */
+ if (card->ext_csd.rev >= 8) {
+ if (card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)
+ rel_wr_cnt = 32;
+ else
+ rel_wr_cnt = 2;
+ }
+ ops->reliable_wr_cnt = rel_wr_cnt;
+}
+
+static void mmc_blk_rpmb_add(struct mmc_card *card)
+{
+ struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
+ struct mmc_blk_data *part_md = mmc_blk_rpmb_part_get(md);
+ struct rpmb_dev *rdev;
+
+ if (!part_md)
+ return;
+
+ mmc_blk_rpmb_set_dev_id(&mmc_rpmb_dev_ops, card);
+ mmc_blk_rpmb_set_rel_wr_cnt(&mmc_rpmb_dev_ops, card);
+
+ rdev = rpmb_dev_register(disk_to_dev(part_md->disk),
+ &mmc_rpmb_dev_ops);
+ if (IS_ERR(rdev)) {
+ pr_warn("%s: cannot register to rpmb %ld\n",
+ part_md->disk->disk_name, PTR_ERR(rdev));
+ }
+}
+
+static void mmc_blk_rpmb_remove(struct mmc_card *card)
+{
+ struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
+ struct mmc_blk_data *part_md = mmc_blk_rpmb_part_get(md);
+
+ if (part_md)
+ rpmb_dev_unregister(disk_to_dev(part_md->disk));
+
+ mmc_blk_rpmb_unset_dev_id(&mmc_rpmb_dev_ops);
+}
+
static int mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
{
struct mmc_blk_data *md = mq->data;
@@ -2611,6 +2859,8 @@ static int mmc_blk_probe(struct mmc_card *card)
goto out;
}

+ mmc_blk_rpmb_add(card);
+
pm_runtime_set_autosuspend_delay(&card->dev, 3000);
pm_runtime_use_autosuspend(&card->dev);

@@ -2635,6 +2885,7 @@ static void mmc_blk_remove(struct mmc_card *card)
{
struct mmc_blk_data *md = dev_get_drvdata(&card->dev);

+ mmc_blk_rpmb_remove(card);
mmc_blk_remove_parts(card, md);
pm_runtime_get_sync(&card->dev);
mmc_claim_host(card->host);
@@ -2663,6 +2914,7 @@ static int _mmc_blk_suspend(struct mmc_card *card)

static void mmc_blk_shutdown(struct mmc_card *card)
{
+ mmc_blk_rpmb_remove(card);
_mmc_blk_suspend(card);
}

--
2.7.4