drm: ati_pcigart: Do not access I/O MEM space using pointer derefs.
The PCI GART table initialization code treats the GART table mapping
unconditionally as a kernel virtual address.
But it could be in the framebuffer, for example, and thus we're
dealing with a PCI MEM space ioremap() cookie. Treating that as a
virtual address is illegal and will crash some system types (such as
sparc64 where the ioremap() return value is actually a physical I/O
address).
So access the area correctly, using gart_info->gart_table_location as
our guide.
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Dave Airlie <airlied@linux.ie>
diff --git a/drivers/gpu/drm/ati_pcigart.c b/drivers/gpu/drm/ati_pcigart.c
index c533d0c..2cd827a 100644
--- a/drivers/gpu/drm/ati_pcigart.c
+++ b/drivers/gpu/drm/ati_pcigart.c
@@ -95,10 +95,11 @@
int drm_ati_pcigart_init(struct drm_device *dev, struct drm_ati_pcigart_info *gart_info)
{
+ struct drm_local_map *map = &gart_info->mapping;
struct drm_sg_mem *entry = dev->sg;
void *address = NULL;
unsigned long pages;
- u32 *pci_gart, page_base;
+ u32 *pci_gart, page_base, gart_idx;
dma_addr_t bus_address = 0;
int i, j, ret = 0;
int max_pages;
@@ -133,8 +134,14 @@
pages = (entry->pages <= max_pages)
? entry->pages : max_pages;
- memset(pci_gart, 0, max_pages * sizeof(u32));
+ if (gart_info->gart_table_location == DRM_ATI_GART_MAIN) {
+ memset(pci_gart, 0, max_pages * sizeof(u32));
+ } else {
+ for (gart_idx = 0; gart_idx < max_pages; gart_idx++)
+ DRM_WRITE32(map, gart_idx * sizeof(u32), 0);
+ }
+ gart_idx = 0;
for (i = 0; i < pages; i++) {
/* we need to support large memory configurations */
entry->busaddr[i] = pci_map_page(dev->pdev, entry->pagelist[i],
@@ -149,19 +156,26 @@
page_base = (u32) entry->busaddr[i];
for (j = 0; j < (PAGE_SIZE / ATI_PCIGART_PAGE_SIZE); j++) {
+ u32 val;
+
switch(gart_info->gart_reg_if) {
case DRM_ATI_GART_IGP:
- *pci_gart = cpu_to_le32((page_base) | 0xc);
+ val = page_base | 0xc;
break;
case DRM_ATI_GART_PCIE:
- *pci_gart = cpu_to_le32((page_base >> 8) | 0xc);
+ val = (page_base >> 8) | 0xc;
break;
default:
case DRM_ATI_GART_PCI:
- *pci_gart = cpu_to_le32(page_base);
+ val = page_base;
break;
}
- pci_gart++;
+ if (gart_info->gart_table_location ==
+ DRM_ATI_GART_MAIN)
+ pci_gart[gart_idx] = cpu_to_le32(val);
+ else
+ DRM_WRITE32(map, gart_idx * sizeof(u32), val);
+ gart_idx++;
page_base += ATI_PCIGART_PAGE_SIZE;
}
}
