@@ -2955,6 +2955,27 @@ static void mmc_blk_remove_debugfs(struct mmc_card *card,
#endif /* CONFIG_DEBUG_FS */
+static int mmc_blk_rescan_disk(struct mmc_blk_data *md)
+{
+ struct block_device *bdev;
+
+ bdev = blkdev_get_by_dev(disk_devt(md->disk), FMODE_READ | FMODE_EXCL,
+ md);
+ if (IS_ERR(bdev)) {
+ pr_err("%s: %s: failed to get block device\n",
+ __func__, md->disk->disk_name);
+ return PTR_ERR(bdev);
+ }
+
+ mutex_lock(&bdev->bd_mutex);
+ bdev_disk_changed(bdev, false);
+ mutex_unlock(&bdev->bd_mutex);
+
+ blkdev_put(bdev, FMODE_READ | FMODE_EXCL);
+
+ return 0;
+}
+
static int mmc_blk_probe(struct mmc_card *card)
{
struct mmc_blk_data *md, *part_md;
@@ -2998,6 +3019,16 @@ static int mmc_blk_probe(struct mmc_card *card)
goto out;
}
+ /*
+ * Quirk for NVIDIA Tegra devices that store FS partition table
+ * on a boot partition. Tegra-partition scanner found partition
+ * table on a boot MMC partition and stashed it for the main MMC
+ * partition if MMC_QUIRK_RESCAN_MAIN_BLKDEV is set, and thus,
+ * the main partition needs to be re-scanned.
+ */
+ if (card->quirks & MMC_QUIRK_RESCAN_MAIN_BLKDEV)
+ mmc_blk_rescan_disk(md);
+
/* Add two debugfs entries */
mmc_blk_add_debugfs(card, md);
@@ -270,6 +270,7 @@ struct mmc_card {
#define MMC_QUIRK_BROKEN_IRQ_POLLING (1<<11) /* Polling SDIO_CCCR_INTx could create a fake interrupt */
#define MMC_QUIRK_TRIM_BROKEN (1<<12) /* Skip trim */
#define MMC_QUIRK_BROKEN_HPI (1<<13) /* Disable broken HPI support */
+#define MMC_QUIRK_RESCAN_MAIN_BLKDEV (1<<14) /* Main partition needs to be re-scanned after instantiating all partitions */
bool reenable_cmdq; /* Re-enable Command Queue */
NVIDIA Tegra Partition Table location isn't restricted by the main eMMC partition. This patch introduces new MMC-card quirk which is needed by some NVIDIA Tegra devices in order to set up partition table if it is stored on a eMMC boot partition. The tegra-partition parser will read out FS partition table from the eMMC boot partition and stash it for the main eMMC partition. In this case block device of the main eMMC partition needs to be re-scanned in order to assign the stashed partition table to the main MMC block device by tegra-partition parser. This patch adds new MMC card flag that is applied by tegra-partition parser to the scanned MMC card if partition table is found on a boot eMMC partition. This flag tells MMC_BLOCK core that main MMC partition needs to be re-scanned once all block devices of the MMC card are instantiated. Signed-off-by: Dmitry Osipenko <digetx@gmail.com> --- drivers/mmc/core/block.c | 31 +++++++++++++++++++++++++++++++ include/linux/mmc/card.h | 1 + 2 files changed, 32 insertions(+)