From 975136d6e5adc6b6a03719499cf39fbd3f67dc90 Mon Sep 17 00:00:00 2001
From: Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
Date: Wed, 27 Dec 2006 15:32:09 +0100
Subject: [PATCH] Proper allocation of AGP pages for ttms.

---
 linux-core/drm_compat.c |  5 ++---
 linux-core/drm_compat.h | 13 +++----------
 linux-core/drm_ttm.c    |  6 ++----
 linux-core/drm_vm.c     |  5 ++---
 4 files changed, 9 insertions(+), 20 deletions(-)

diff --git a/linux-core/drm_compat.c b/linux-core/drm_compat.c
index cde77ea7..6bb58424 100644
--- a/linux-core/drm_compat.c
+++ b/linux-core/drm_compat.c
@@ -251,7 +251,8 @@ struct page *drm_vm_ttm_nopage(struct vm_area_struct *vma,
 			page = NOPAGE_OOM;
 			goto out;
 		}
-		page = ttm->pages[page_offset] = drm_alloc_gatt_pages(0);
+		page = ttm->pages[page_offset] = 
+			alloc_page(GFP_KERNEL | __GFP_ZERO | GFP_DMA32);
 		if (!page) {
 		        drm_free_memctl(PAGE_SIZE);
 			page = NOPAGE_OOM;
@@ -259,8 +260,6 @@ struct page *drm_vm_ttm_nopage(struct vm_area_struct *vma,
 		}
 		++bm->cur_pages;
 		SetPageLocked(page);
-		clear_page(kmap(page));
-		kunmap(page);
 	}
 
 	get_page(page);
diff --git a/linux-core/drm_compat.h b/linux-core/drm_compat.h
index dcda1936..ddc255d3 100644
--- a/linux-core/drm_compat.h
+++ b/linux-core/drm_compat.h
@@ -180,16 +180,9 @@ extern void drm_clear_vma(struct vm_area_struct *vma,
 
 extern pgprot_t vm_get_page_prot(unsigned long vm_flags);
 
-/*
- * These are similar to the current kernel gatt pages allocator, only that we
- * want a struct page pointer instead of a virtual address. This allows for pages
- * that are not in the kernel linear map.
- */
-
-#define drm_alloc_gatt_pages(order) ({					\
-			void *_virt = alloc_gatt_pages(order);		\
-			((_virt) ? virt_to_page(_virt) : NULL);})
-#define drm_free_gatt_pages(pages, order) free_gatt_pages(page_address(pages), order) 
+#ifndef GFP_DMA32
+#define GFP_DMA32 0
+#endif
 
 #if defined(CONFIG_X86) && (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,15))
 
diff --git a/linux-core/drm_ttm.c b/linux-core/drm_ttm.c
index c32dfcf9..1c9b1cf7 100644
--- a/linux-core/drm_ttm.c
+++ b/linux-core/drm_ttm.c
@@ -193,7 +193,7 @@ int drm_destroy_ttm(drm_ttm_t * ttm)
 				 * End debugging.
 				 */
 
-				drm_free_gatt_pages(*cur_page, 0);
+				__free_page(*cur_page);
 				drm_free_memctl(PAGE_SIZE);
 				--bm->cur_pages;
 			}
@@ -225,7 +225,7 @@ static int drm_ttm_populate(drm_ttm_t * ttm)
 			if (drm_alloc_memctl(PAGE_SIZE)) {
 				return -ENOMEM;
 			}
-			page = drm_alloc_gatt_pages(0);
+			page = alloc_page(GFP_KERNEL | __GFP_ZERO | GFP_DMA32);
 			if (!page) {
 				drm_free_memctl(PAGE_SIZE);
 				return -ENOMEM;
@@ -235,8 +235,6 @@ static int drm_ttm_populate(drm_ttm_t * ttm)
 #else
 			SetPageReserved(page);
 #endif
-			clear_page(kmap(page));
-			kunmap(page);
 			ttm->pages[i] = page;
 			++bm->cur_pages;
 		}
diff --git a/linux-core/drm_vm.c b/linux-core/drm_vm.c
index f36218e9..7ac7f3c0 100644
--- a/linux-core/drm_vm.c
+++ b/linux-core/drm_vm.c
@@ -208,7 +208,8 @@ struct page *drm_vm_ttm_fault(struct vm_area_struct *vma,
 			data->type = VM_FAULT_OOM;
 			goto out;
 		}
-		page = ttm->pages[page_offset] = drm_alloc_gatt_pages(0);
+		page = ttm->pages[page_offset] = 
+			alloc_page(GFP_KERNEL | __GFP_ZERO | GFP_DMA32);
 		if (!page) {
 			drm_free_memctl(PAGE_SIZE);
 			data->type = VM_FAULT_OOM;
@@ -220,8 +221,6 @@ struct page *drm_vm_ttm_fault(struct vm_area_struct *vma,
 #else
 		SetPageReserved(page);
 #endif
-		clear_page(kmap(page));
-		kunmap(page);
 	}
 
 	if (ttm->page_flags & DRM_TTM_PAGE_UNCACHED) {