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authorFenghua Yu <fenghua.yu@intel.com>2009-02-18 15:54:33 -0800
committerJohn W. Linville <linville@tuxdriver.com>2009-02-27 14:52:47 -0500
commit96891ceedaeaac95aa5b9dba5e68a8e77d541e78 (patch)
tree4f0666a793ec60dbd4194755d076b5c7ae709807 /drivers/net/tokenring
parent7dc45f25d39ea959fdc1d5f636e9fc6cbe7ac7e0 (diff)
iwlwifi: dma mapping read and write changes
When iwlwifi runs on IOMMU, IOMMU generates a lot of PTE write faults because PTE write bit is not set on some of PTE's. This is because iwlwifi driver calls DMA mapping with PCI_DMA_TODEVICE which is read only in mapping PTE. But iwlwifi device actually writes to the mapped page to update its contents. This issue is not exposed in swiotlb. But VT-d hardware can capture this fault and stop the fault transaction. The iwl TX command contains a scratch field that is updated by uCode to indicate retry counts. For 5000 series the patch is required also for regular frames, but this patch does not differenciate. Signed-off-by: Fenghua Yu <fenghua.yu@intel.com> Acked-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Reinette Chatre <reinette.chatre@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net/tokenring')
0 files changed, 0 insertions, 0 deletions