Jerome, Konrad
Forgive an ignorant question, but it appears like both Nouveau and
Radeon may use pci_map_page() when populating TTMs on
pages obtained using the ordinary (not DMA pool). These pages will, if I
understand things correctly, not be pages allocated with
DMA_ALLOC_COHERENT.
From what I understand, at least for the corresponding dma_map_page()
it's illegal for the CPU to access these pages without calling
dma_sync_xx_for_cpu(). And before the device is allowed to access them
again, you need to call dma_sync_xx_for_device().
So mapping for PCI really invalidates the TTM interleaved CPU / device
access model.
Or did I miss something here?
Thanks,
Thomas
_______________________________________________
dri-devel mailing list
dri-devel@xxxxxxxxxxxxxxxxxxxxx
http://lists.freedesktop.org/mailman/listinfo/dri-devel
