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scsi: ufs: Introduce a quirk to allow only page-aligned sg entries 

Some SoCs require a single scatterlist entry for smaller than page size,
i.e. 4KB. When dispatching commands with more than one scatterlist entry
under 4KB in size the following behavior is observed:

A command to read a block range is dispatched with two scatterlist entries
that are named AAA and BBB. After dispatching, the host builds two PRDT
entries and during transmission, device sends just one DATA IN because
device doesn't care about host DMA. The host then transfers the combined
amount of data from start address of the area named AAA. As a consequence,
the area that follows AAA in memory would be corrupted.

    |<------------->|
    +-------+------------         +-------+
    +  AAA  + (corrupted)   ...   +  BBB  +
    +-------+------------         +-------+

To avoid this we need to enforce page size alignment for sg entries.

Link: https://lore.kernel.org/r/56dddef94f60bd9466fd77e69f64bbbd657ed2a1.1611026909.git.kwmad.kim@samsung.com
Signed-off-by: Kiwoong Kim <kwmad.kim@samsung.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Kiwoong Kim 2021-01-19 12:33:41 +09:00 committed by Martin K. Petersen
parent 60ec37555d
commit 2b2bfc8aa5
2 changed files with 6 additions and 0 deletions
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2
drivers/scsi/ufs/ufshcd.c
View File

@ -4852,6 +4852,8 @@ static int ufshcd_slave_configure(struct scsi_device *sdev)
struct request_queue *q = sdev->request_queue;
blk_queue_update_dma_pad(q, PRDT_DATA_BYTE_COUNT_PAD - 1);
if (hba->quirks & UFSHCD_QUIRK_ALIGN_SG_WITH_PAGE_SIZE)
blk_queue_update_dma_alignment(q, PAGE_SIZE - 1);
if (ufshcd_is_rpm_autosuspend_allowed(hba))
sdev->rpm_autosuspend = 1;

4
drivers/scsi/ufs/ufshcd.h
View File

@ -559,6 +559,10 @@ enum ufshcd_quirks {
*/
UFSHCD_QUIRK_SKIP_DEF_UNIPRO_TIMEOUT_SETTING = 1 << 13,
/*
* This quirk allows only sg entries aligned with page size.
*/
UFSHCD_QUIRK_ALIGN_SG_WITH_PAGE_SIZE = 1 << 13,
};
enum ufshcd_caps {