agp: switch AGP to use page array instead of unsigned long array

This switches AGP to use an array of pages for tracking the
pages allocated to the GART. This should enable GEM on PAE to work
a lot better as we can pass highmem pages to the PAT code and it will
do the right thing with them.

Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/drm_agpsupport.c

@@ -482,7 +482,7 @@ drm_agp_bind_pages(struct drm_device *dev,
 	}
 
 	for (i = 0; i < num_pages; i++)
-		mem->memory[i] = phys_to_gart(page_to_phys(pages[i]));
+		mem->pages[i] = pages[i];
 	mem->page_count = num_pages;
 
 	mem->is_flushed = true;

drivers/gpu/drm/drm_memory.c

@@ -59,10 +59,11 @@ int drm_mem_info(char *buf, char **start, off_t offset,
 static void *agp_remap(unsigned long offset, unsigned long size,
 		       struct drm_device * dev)
 {
-	unsigned long *phys_addr_map, i, num_pages =
+	unsigned long i, num_pages =
 	    PAGE_ALIGN(size) / PAGE_SIZE;
 	struct drm_agp_mem *agpmem;
 	struct page **page_map;
+	struct page **phys_page_map;
 	void *addr;
 
 	size = PAGE_ALIGN(size);
@@ -89,10 +90,9 @@ static void *agp_remap(unsigned long offset, unsigned long size,
 	if (!page_map)
 		return NULL;
 
-	phys_addr_map =
-	    agpmem->memory->memory + (offset - agpmem->bound) / PAGE_SIZE;
+	phys_page_map = (agpmem->memory->pages + (offset - agpmem->bound) / PAGE_SIZE);
 	for (i = 0; i < num_pages; ++i)
-		page_map[i] = pfn_to_page(phys_addr_map[i] >> PAGE_SHIFT);
+		page_map[i] = phys_page_map[i];
 	addr = vmap(page_map, num_pages, VM_IOREMAP, PAGE_AGP);
 	vfree(page_map);
 

drivers/gpu/drm/drm_vm.c

@@ -144,14 +144,14 @@ static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 		 * Get the page, inc the use count, and return it
 		 */
 		offset = (baddr - agpmem->bound) >> PAGE_SHIFT;
-		page = virt_to_page(__va(agpmem->memory->memory[offset]));
+		page = agpmem->memory->pages[offset];
 		get_page(page);
 		vmf->page = page;
 
 		DRM_DEBUG
 		    ("baddr = 0x%llx page = 0x%p, offset = 0x%llx, count=%d\n",
 		     (unsigned long long)baddr,
-		     __va(agpmem->memory->memory[offset]),
+		     agpmem->memory->pages[offset],
 		     (unsigned long long)offset,
 		     page_count(page));
 		return 0;

drivers/gpu/drm/ttm/ttm_agp_backend.c

@@ -63,8 +63,7 @@ static int ttm_agp_populate(struct ttm_backend *backend,
 		if (!page)
 			page = dummy_read_page;
 
-		mem->memory[mem->page_count++] =
-		    phys_to_gart(page_to_phys(page));
+		mem->pages[mem->page_count++] = page;
 	}
 	agp_be->mem = mem;
 	return 0;