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@intel.com Signed-off-by: Alexander Usyskin alexander.usyskin@intel.com Signed-off-by: Jens Wiklander jens.wiklander@linaro.org --- 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;