Messages in this thread | | | Date | Wed, 10 Aug 2011 15:31:59 +0200 | From | "Roedel, Joerg" <> | Subject | Re: [PATCH] dma-debug: hash_bucket_find needs to allow for offsets within an entry (v2) |
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On Mon, Aug 08, 2011 at 03:13:54PM -0400, Neil Horman wrote: > dma-debug: hash_bucket_find needs to allow for offsets within an entry (v2) > > Summary: > Users of the pci_dma_sync_single_* api allow users to sync address ranges within > the range of a mapped entry (i.e. you can dma map address X to dma_addr_t A and > then pci_dma_sync_single on dma_addr_t A+1. The dma-debug library however > assume dma syncs will always occur using the base address of a mapped region, > and uses that assumption to find entries in its hash table. Since thats often > (but not always the case), the dma debug library can give us false errors about > missing entries, which are reported as syncing of memory not allocated by the > driver. This was noted in the cxgb3 driver as this error:
Hi Neil,
thanks for your patch. Im out-of-office this week and traveling next week. So it may take a couple of days until I can take an in-depth look at it. But I get to it as soon as I can :-)
Regards,
Joerg
-- AMD Operating System Research Center
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