The buffers mapped by the PCI GART can be written to by the device,
not just read.
For example, this happens via the RB_RPTR writeback on Radeon.
So we can't use PCI_DMA_TODEVICE else we'll get protection faults
on IOMMU platforms.
Signed-off-by: David S. Miller <da...@davemloft.net>
---
drivers/gpu/drm/ati_pcigart.c | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/ati_pcigart.c b/drivers/gpu/drm/ati_pcigart.c
index 2cd827a..7972ec8 100644
--- a/drivers/gpu/drm/ati_pcigart.c
+++ b/drivers/gpu/drm/ati_pcigart.c
@@ -77,7 +77,7 @@ int drm_ati_pcigart_cleanup(struct drm_device *dev, struct
drm_ati_pcigart_info
if (!entry->busaddr[i])
break;
pci_unmap_page(dev->pdev, entry->busaddr[i],
- PAGE_SIZE, PCI_DMA_TODEVICE);
+ PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
}
if (gart_info->gart_table_location == DRM_ATI_GART_MAIN)
@@ -145,7 +145,7 @@ int drm_ati_pcigart_init(struct drm_device *dev, struct
drm_ati_pcigart_info *ga
for (i = 0; i < pages; i++) {
/* we need to support large memory configurations */
entry->busaddr[i] = pci_map_page(dev->pdev, entry->pagelist[i],
- 0, PAGE_SIZE,
PCI_DMA_TODEVICE);
+ 0, PAGE_SIZE,
PCI_DMA_BIDIRECTIONAL);
if (entry->busaddr[i] == 0) {
DRM_ERROR("unable to map PCIGART pages!\n");
drm_ati_pcigart_cleanup(dev, gart_info);
--
1.6.1.2.350.g88cc
------------------------------------------------------------------------------
Create and Deploy Rich Internet Apps outside the browser with Adobe(R)AIR(TM)
software. With Adobe AIR, Ajax developers can use existing skills and code to
build responsive, highly engaging applications that combine the power of local
resources and data with the reach of the web. Download the Adobe AIR SDK and
Ajax docs to start building applications today-http://p.sf.net/sfu/adobe-com
--
_______________________________________________
Dri-devel mailing list
Dri-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/dri-devel
