Messages in this thread | | | Date | Mon, 22 Aug 2011 06:46:21 -0400 | From | Neil Horman <> | Subject | Re: [PATCH] dma-debug: hash_bucket_find needs to allow for offsets within an entry (v2) |
| |
On Wed, Aug 10, 2011 at 03:31:59PM +0200, Roedel, Joerg wrote: > 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 > Hey, Jeorg, just wondering if you managed to get a look at this? Neil
> -- > AMD Operating System Research Center > > Advanced Micro Devices GmbH Einsteinring 24 85609 Dornach > General Managers: Alberto Bozzo, Andrew Bowd > Registration: Dornach, Landkr. Muenchen; Registerger. Muenchen, HRB Nr. 43632 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ >
| |