17.05.2020 05:12, Dmitry Osipenko пишет:
> NVIDIA Tegra Partition Table takes into account MMC card's BOOT_SIZE_MULT
> parameter, and thus, the partition parser needs to retrieve that EXT_CSD
> value from the block device. There are also some other parts of struct
> mmc_card that are needed for the partition parser in order to calculate
> the eMMC offset and verify different things. This patch introduces new
> helper which takes block device for the input argument and returns the
> corresponding MMC card.
>
> Signed-off-by: Dmitry Osipenko <digetx@xxxxxxxxx>
> ---
> drivers/mmc/core/block.c | 15 +++++++++++++++
> include/linux/mmc/blkdev.h | 13 +++++++++++++
> 2 files changed, 28 insertions(+)
> create mode 100644 include/linux/mmc/blkdev.h
>
> diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
> index c5367e2c8487..99298e888381 100644
> --- a/drivers/mmc/core/block.c
> +++ b/drivers/mmc/core/block.c
> @@ -40,6 +40,7 @@
> #include <linux/debugfs.h>
>
> #include <linux/mmc/ioctl.h>
> +#include <linux/mmc/blkdev.h>
> #include <linux/mmc/card.h>
> #include <linux/mmc/host.h>
> #include <linux/mmc/mmc.h>
> @@ -305,6 +306,20 @@ static ssize_t force_ro_store(struct device *dev, struct device_attribute *attr,
> return ret;
> }
>
> +struct mmc_card *mmc_bdev_to_card(struct block_device *bdev)
> +{
> + struct mmc_blk_data *md;
> +
> + if (bdev->bd_disk->major != MMC_BLOCK_MAJOR)
> + return NULL;
> +
> + md = mmc_blk_get(bdev->bd_disk);
> + if (!md)
> + return NULL;
> +
> + return md->queue.card;
> +}
> +
> static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
> {
> struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
> diff --git a/include/linux/mmc/blkdev.h b/include/linux/mmc/blkdev.h
> new file mode 100644
> index 000000000000..67608c58de70
> --- /dev/null
> +++ b/include/linux/mmc/blkdev.h
> @@ -0,0 +1,13 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/*
> + * linux/include/linux/mmc/blkdev.h
> + */
> +#ifndef LINUX_MMC_BLOCK_DEVICE_H
> +#define LINUX_MMC_BLOCK_DEVICE_H
> +
> +struct block_device;
> +struct mmc_card;
> +
> +struct mmc_card *mmc_bdev_to_card(struct block_device *bdev);
> +
> +#endif /* LINUX_MMC_BLOCK_DEVICE_H */
>
Hello Ulf / Jens and everyone,
Guys, what do you think about this change?
Currently it's not allowed to compile MMC_BLOCK as a loadable kernel
module if TEGRA_PARTITION is enabled because it depends on MMC_BLOCK
presence. I'm curious if this situation could be improved by moving
mmc_bdev_to_card() to linux/mmc/blkdev.h and then:
1. Moving all private mmc/core/block.c structs to the public
linux/mmc/blkdev.h.
2. Or adding a "private opaque" pointer to a struct block_device and
setting it to md->queue.card, for example.
3. I see that struct block_device already has some bd_private field, but
I'm not sure whether it could be used for what I'm trying to achieve.
Actually I don't see where bd_private is used in kernel at all.
I'd like get yours feedback, thanks in advance.
