Register eMMC RPMB partition with the RPMB subsystem and provide
an implementation for the RPMB access operations abstracting
the actual multi step process.
Add a callback to extract the needed device information at registration
to avoid accessing the struct mmc_card at a later stage as we're not
holding a reference counter for this struct.
Taking the needed reference to md->disk in mmc_blk_alloc_rpmb_part()
instead of in mmc_rpmb_chrdev_open(). This is needed by the
route_frames() function pointer in struct rpmb_ops.
Signed-off-by: Tomas Winkler <tomas.winkler@xxxxxxxxx>
Signed-off-by: Alexander Usyskin <alexander.usyskin@xxxxxxxxx>
Signed-off-by: Jens Wiklander <jens.wiklander@xxxxxxxxxx>
---
drivers/mmc/core/block.c | 153 ++++++++++++++++++++++++++++++++++++++-
1 file changed, 151 insertions(+), 2 deletions(-)
diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
index 32d49100dff5..f35c99638eb2 100644
--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c
@@ -33,6 +33,7 @@
#include <linux/cdev.h>
#include <linux/mutex.h>
#include <linux/scatterlist.h>
+#include <linux/string.h>
#include <linux/string_helpers.h>
#include <linux/delay.h>
#include <linux/capability.h>
@@ -40,6 +41,7 @@
#include <linux/pm_runtime.h>
#include <linux/idr.h>
#include <linux/debugfs.h>
+#include <linux/rpmb.h>
#include <linux/mmc/ioctl.h>
#include <linux/mmc/card.h>
@@ -163,6 +165,7 @@ struct mmc_rpmb_data {
int id;
unsigned int part_index;
struct mmc_blk_data *md;
+ struct rpmb_dev *rdev;
struct list_head node;
};
@@ -2672,7 +2675,6 @@ static int mmc_rpmb_chrdev_open(struct inode *inode, struct file *filp)
get_device(&rpmb->dev);
filp->private_data = rpmb;
- mmc_blk_get(rpmb->md->disk);
return nonseekable_open(inode, filp);
}
@@ -2682,7 +2684,6 @@ static int mmc_rpmb_chrdev_release(struct inode *inode, struct file *filp)
struct mmc_rpmb_data *rpmb = container_of(inode->i_cdev,
struct mmc_rpmb_data, chrdev);
- mmc_blk_put(rpmb->md);
put_device(&rpmb->dev);
return 0;
@@ -2703,10 +2704,147 @@ static void mmc_blk_rpmb_device_release(struct device *dev)
{
struct mmc_rpmb_data *rpmb = dev_get_drvdata(dev);
+ rpmb_dev_unregister(rpmb->rdev);
+ mmc_blk_put(rpmb->md);
ida_simple_remove(&mmc_rpmb_ida, rpmb->id);
kfree(rpmb);
}
+static void free_idata(struct mmc_blk_ioc_data **idata, unsigned int cmd_count)
+{
+ unsigned int n;
+
+ for (n = 0; n < cmd_count; n++)
+ kfree(idata[n]);
+ kfree(idata);
+}
+
+static struct mmc_blk_ioc_data **alloc_idata(struct mmc_rpmb_data *rpmb,
+ unsigned int cmd_count)
+{
+ struct mmc_blk_ioc_data **idata;
+ unsigned int n;
+
+ idata = kcalloc(cmd_count, sizeof(*idata), GFP_KERNEL);
+ if (!idata)
+ return NULL;
+
+ for (n = 0; n < cmd_count; n++) {
+ idata[n] = kcalloc(1, sizeof(**idata), GFP_KERNEL);
+ if (!idata[n]) {
+ free_idata(idata, n);
+ return NULL;
+ }
+ idata[n]->rpmb = rpmb;
+ }
+
+ return idata;
+}
+
+static void set_idata(struct mmc_blk_ioc_data *idata, u32 opcode,
+ int write_flag, u8 *buf, unsigned int buf_bytes)
+{
+ idata->ic.opcode = opcode;
+ idata->ic.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
+ idata->ic.write_flag = write_flag;
+ idata->ic.blksz = sizeof(struct rpmb_frame);
+ idata->ic.blocks = buf_bytes / idata->ic.blksz;
+ idata->buf = buf;
+ idata->buf_bytes = buf_bytes;
+}
+
+static int rpmb_op_mmc_route_frames(struct device *dev, bool write, u8 *req,
+ unsigned int req_len, u8 *resp,
+ unsigned int resp_len)
+{
+ struct mmc_rpmb_data *rpmb = dev_get_drvdata(dev);
+ struct mmc_blk_data *md = rpmb->md;
+ struct mmc_blk_ioc_data **idata;
+ unsigned int cmd_count;
+ struct request *rq;
+ int ret;
+
+ if (write)
+ cmd_count = 3;
+ else
+ cmd_count = 2;
+
+ if (IS_ERR(md->queue.card))
+ return PTR_ERR(md->queue.card);
+
+ idata = alloc_idata(rpmb, cmd_count);
+ if (!idata)
+ return -ENOMEM;
+
+ if (write) {
+ struct rpmb_frame *frm = (struct rpmb_frame *)resp;
+
+ /* Send write request frame(s) */
+ set_idata(idata[0], MMC_WRITE_MULTIPLE_BLOCK,
+ 1 | MMC_CMD23_ARG_REL_WR, req, req_len);
+
+ /* Send result request frame */
+ memset(frm, 0, sizeof(*frm));
+ frm->req_resp = cpu_to_be16(RPMB_RESULT_READ);
+ set_idata(idata[1], MMC_WRITE_MULTIPLE_BLOCK, 1, resp,
+ resp_len);
+
+ /* Read response frame */
+ set_idata(idata[2], MMC_READ_MULTIPLE_BLOCK, 0, resp, resp_len);
+ } else {
+ /* Send write request frame(s) */
+ set_idata(idata[0], MMC_WRITE_MULTIPLE_BLOCK, 1, req, req_len);
+
+ /* Read response frame */
+ set_idata(idata[1], MMC_READ_MULTIPLE_BLOCK, 0, resp, resp_len);
+ }
+
+ rq = blk_mq_alloc_request(md->queue.queue, REQ_OP_DRV_OUT, 0);
+ if (IS_ERR(rq)) {
+ ret = PTR_ERR(rq);
+ goto out;
+ }
+
+ req_to_mmc_queue_req(rq)->drv_op = MMC_DRV_OP_IOCTL_RPMB;
+ req_to_mmc_queue_req(rq)->drv_op_result = -EIO;
+ req_to_mmc_queue_req(rq)->drv_op_data = idata;
+ req_to_mmc_queue_req(rq)->ioc_count = cmd_count;
+ blk_execute_rq(rq, false);
+ ret = req_to_mmc_queue_req(rq)->drv_op_result;
+
+ blk_mq_free_request(rq);
+
+out:
+ free_idata(idata, cmd_count);
+ return ret;
+}
+
+static int rpmb_op_mmc_set_dev_info(struct device *dev, struct rpmb_dev *rdev)
+{
+ struct mmc_rpmb_data *rpmb = dev_get_drvdata(dev);
+ struct mmc_card *card = rpmb->md->queue.card;
+ unsigned int n;
+ u32 cid[4];
+
+ for (n = 0; n < 4; n++)
+ cid[n] = be32_to_cpu(card->raw_cid[n]);
+
+ rdev->dev_id = kmemdup(cid, sizeof(cid), GFP_KERNEL);
+ if (!rdev->dev_id)
+ return -ENOMEM;
+ rdev->dev_id_len = sizeof(cid);
+ rdev->reliable_wr_count = card->ext_csd.raw_rpmb_size_mult;
+ rdev->capacity = card->ext_csd.rel_sectors;
+
+ return 0;
+}
+
+static struct rpmb_ops rpmb_mmc_ops = {
+ .type = RPMB_TYPE_EMMC,
+ .route_frames = rpmb_op_mmc_route_frames,
+ .set_dev_info = rpmb_op_mmc_set_dev_info,
+};
+
static int mmc_blk_alloc_rpmb_part(struct mmc_card *card,
struct mmc_blk_data *md,
unsigned int part_index,
@@ -2741,6 +2879,7 @@ static int mmc_blk_alloc_rpmb_part(struct mmc_card *card,
rpmb->dev.release = mmc_blk_rpmb_device_release;
device_initialize(&rpmb->dev);
dev_set_drvdata(&rpmb->dev, rpmb);
+ mmc_blk_get(md->disk);
rpmb->md = md;
cdev_init(&rpmb->chrdev, &mmc_rpmb_fileops);
@@ -2751,6 +2890,14 @@ static int mmc_blk_alloc_rpmb_part(struct mmc_card *card,
goto out_put_device;
}
+ rpmb->rdev = rpmb_dev_register(&rpmb->dev, &rpmb_mmc_ops);
+ if (IS_ERR(rpmb->rdev)) {
+ pr_err("%s: could not register RPMB device\n", rpmb_name);
+ ret = PTR_ERR(rpmb->rdev);
+ rpmb->rdev = NULL;
+ goto out_cdev_device_del;
+ }
+
list_add(&rpmb->node, &md->rpmbs);
string_get_size((u64)size, 512, STRING_UNITS_2,
@@ -2762,6 +2909,8 @@ static int mmc_blk_alloc_rpmb_part(struct mmc_card *card,
return 0;
+out_cdev_device_del:
+ cdev_device_del(&rpmb->chrdev, &rpmb->dev);
out_put_device:
put_device(&rpmb->dev);
return ret;
--
2.34.1
