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Commit 419c434c authored by Yang Shi's avatar Yang Shi Committed by Jens Axboe
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Fix DMA access of block device in 64-bit kernel on some non-x86 systems with... 


Fix DMA access of block device in 64-bit kernel on some non-x86 systems with 4GB or upper 4GB memory

For some non-x86 systems with 4GB or upper 4GB memory,
we need increase the range of addresses that can be
used for direct DMA in 64-bit kernel.

Signed-off-by: default avatarYang Shi <yang.shi@windriver.com>
Signed-off-by: default avatarJens Axboe <jens.axboe@oracle.com>
parent e3790c7d

block/blk-settings.c

+1 −1
Original line number Original line Diff line number Diff line
@@ -140,7 +140,7 @@ void blk_queue_bounce_limit(struct request_queue *q, u64 dma_addr) 
	/* Assume anything <= 4GB can be handled by IOMMU.

	/* Assume anything <= 4GB can be handled by IOMMU.

	   Actually some IOMMUs can handle everything, but I don't

	   Actually some IOMMUs can handle everything, but I don't

	   know of a way to test this here. */

	   know of a way to test this here. */

	if (b_pfn < (min_t(u64, 0xffffffff, BLK_BOUNCE_HIGH) >> PAGE_SHIFT))

	if (b_pfn <= (min_t(u64, 0xffffffff, BLK_BOUNCE_HIGH) >> PAGE_SHIFT))

		dma = 1;

		dma = 1;

	q->bounce_pfn = max_low_pfn;

	q->bounce_pfn = max_low_pfn;

#else

#else