From e5d3c7f260d18168eec755c73f01ac617390d96c Mon Sep 17 00:00:00 2001
From: Michel Daenzer <michel@daenzer.net>
Date: Fri, 16 May 2003 23:41:27 +0000
Subject: Support AGP bridges where the AGP aperture can't be accessed directly
 by     the CPU (David Mosberger, Benjamin Herrenschmidt, myself, Paul    
 Mackerras, Jeff Wiedemeier)

---
 linux-core/drm_vm.c | 41 +++++++++++++++++++++++++++--------------
 1 file changed, 27 insertions(+), 14 deletions(-)

(limited to 'linux-core/drm_vm.c')

diff --git a/linux-core/drm_vm.c b/linux-core/drm_vm.c
index 76a10cf5..59b19da3 100644
--- a/linux-core/drm_vm.c
+++ b/linux-core/drm_vm.c
@@ -108,12 +108,12 @@ struct page *DRM(vm_nopage)(struct vm_area_struct *vma,
                  * Get the page, inc the use count, and return it
                  */
 		offset = (baddr - agpmem->bound) >> PAGE_SHIFT;
-		agpmem->memory->memory[offset] &= dev->agp->page_mask;
 		page = virt_to_page(__va(agpmem->memory->memory[offset]));
 		get_page(page);
 
-		DRM_DEBUG("baddr = 0x%lx page = 0x%p, offset = 0x%lx\n",
-			  baddr, __va(agpmem->memory->memory[offset]), offset);
+		DRM_DEBUG("baddr = 0x%lx page = 0x%p, offset = 0x%lx, count=%d\n",
+			  baddr, __va(agpmem->memory->memory[offset]), offset,
+			  atomic_read(&page->count));
 
 		return page;
         }
@@ -207,7 +207,7 @@ void DRM(vm_shm_close)(struct vm_area_struct *vma)
 					DRM_DEBUG("mtrr_del = %d\n", retcode);
 				}
 #endif
-				DRM(ioremapfree)(map->handle, map->size);
+				DRM(ioremapfree)(map->handle, map->size, dev);
 				break;
 			case _DRM_SHM:
 				vfree(map->handle);
@@ -381,7 +381,16 @@ int DRM(mmap)(struct file *filp, struct vm_area_struct *vma)
 
 	if ( !priv->authenticated ) return -EACCES;
 
-	if (!VM_OFFSET(vma)) return DRM(mmap_dma)(filp, vma);
+	/* We check for "dma". On Apple's UniNorth, it's valid to have
+	 * the AGP mapped at physical address 0
+	 * --BenH.
+	 */
+	if (!VM_OFFSET(vma)
+#if __REALLY_HAVE_AGP
+	    && (!dev->agp || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE)
+#endif
+	    )
+		return DRM(mmap_dma)(filp, vma);
 
 				/* A sequential search of a linked list is
 				   fine here because: 1) there will only be
@@ -421,15 +430,19 @@ int DRM(mmap)(struct file *filp, struct vm_area_struct *vma)
 
 	switch (map->type) {
         case _DRM_AGP:
-#if defined(__alpha__)
+#if __REALLY_HAVE_AGP
+	  if (dev->agp->cant_use_aperture) {
                 /*
-                 * On Alpha we can't talk to bus dma address from the
-                 * CPU, so for memory of type DRM_AGP, we'll deal with
-                 * sorting out the real physical pages and mappings
-                 * in nopage()
+                 * On some platforms we can't talk to bus dma address from the CPU, so for
+                 * memory of type DRM_AGP, we'll deal with sorting out the real physical
+                 * pages and mappings in nopage()
                  */
+#if defined(__powerpc__)
+		pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
+#endif
                 vma->vm_ops = &DRM(vm_ops);
                 break;
+	  }
 #endif
                 /* fall through to _DRM_FRAME_BUFFER... */        
 	case _DRM_FRAME_BUFFER:
@@ -440,15 +453,15 @@ int DRM(mmap)(struct file *filp, struct vm_area_struct *vma)
 				pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
 				pgprot_val(vma->vm_page_prot) &= ~_PAGE_PWT;
 			}
-#elif defined(__ia64__)
-			if (map->type != _DRM_AGP)
-				vma->vm_page_prot =
-					pgprot_writecombine(vma->vm_page_prot);
 #elif defined(__powerpc__)
 			pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE | _PAGE_GUARDED;
 #endif
 			vma->vm_flags |= VM_IO;	/* not in core dump */
 		}
+#if defined(__ia64__)
+		if (map->type != _DRM_AGP)
+			vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
+#endif
 		offset = DRIVER_GET_REG_OFS();
 #ifdef __sparc__
 		if (io_remap_page_range(DRM_RPR_ARG(vma) vma->vm_start,
-- 
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