drm: nopage compat fixup for drm_vm

The kernel has removed nopage so move the old nopage codepaths into a compat vm file and switch to using the fault paths.

nopfn is on its way out in the future also, so we should switch to using fault
for that path as well soon

5 files changed, 349 insertions, 82 deletions

diff --git a/linux-core/Makefile.kernel b/linux-core/Makefile.kernel
index f012262d..7a477a10 100644
--- a/linux-core/Makefile.kernel
+++ b/linux-core/Makefile.kernel
@@ -14,7 +14,7 @@ drm-objs    := drm_auth.o drm_bufs.o drm_context.o drm_dma.o drm_drawable.o \
 		drm_memory_debug.o ati_pcigart.o drm_sman.o \
 		drm_hashtab.o drm_mm.o drm_object.o drm_compat.o \
 	        drm_fence.o drm_ttm.o drm_bo.o drm_bo_move.o drm_bo_lock.o \
-		drm_regman.o
+		drm_regman.o drm_vm_nopage_compat.o
 tdfx-objs   := tdfx_drv.o
 r128-objs   := r128_drv.o r128_cce.o r128_state.o r128_irq.o
 mga-objs    := mga_drv.o mga_dma.o mga_state.o mga_warp.o mga_irq.o
diff --git a/linux-core/drm_compat.c b/linux-core/drm_compat.c
index 23e5028a..3d082e7e 100644
--- a/linux-core/drm_compat.c
+++ b/linux-core/drm_compat.c
@@ -758,3 +758,4 @@ void *kmap_atomic_prot_pfn(unsigned long pfn, enum km_type type,
 EXPORT_SYMBOL(kmap_atomic_prot_pfn);
 
 #endif
+
diff --git a/linux-core/drm_compat.h b/linux-core/drm_compat.h
index 3b1287e1..30834f33 100644
--- a/linux-core/drm_compat.h
+++ b/linux-core/drm_compat.h
@@ -343,4 +343,23 @@ extern void *kmap_atomic_prot_pfn(unsigned long pfn, enum km_type type,
 #define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : (1ULL<<(n)) - 1)
 #endif
 
+#ifndef VM_CAN_NONLINEAR
+#define DRM_VM_NOPAGE 1
+#endif
+
+#ifdef DRM_VM_NOPAGE
+
+extern struct page *drm_vm_nopage(struct vm_area_struct *vma,
+				  unsigned long address, int *type);
+
+extern struct page *drm_vm_shm_nopage(struct vm_area_struct *vma,
+				      unsigned long address, int *type);
+
+extern struct page *drm_vm_dma_nopage(struct vm_area_struct *vma,
+				      unsigned long address, int *type);
+
+extern struct page *drm_vm_sg_nopage(struct vm_area_struct *vma,
+				     unsigned long address, int *type);
+#endif
+
 #endif
diff --git a/linux-core/drm_vm.c b/linux-core/drm_vm.c
index b85b4c13..6618c0ae 100644
--- a/linux-core/drm_vm.c
+++ b/linux-core/drm_vm.c
@@ -81,8 +81,9 @@ static pgprot_t drm_dma_prot(uint32_t map_type, struct vm_area_struct *vma)
 	return tmp;
 }
 
+#ifndef DRM_VM_NOPAGE
 /**
- * \c nopage method for AGP virtual memory.
+ * \c fault method for AGP virtual memory.
  *
  * \param vma virtual memory area.
  * \param address access address.
@@ -92,8 +93,7 @@ static pgprot_t drm_dma_prot(uint32_t map_type, struct vm_area_struct *vma)
  * map, get the page, increment the use count and return it.
  */
 #if __OS_HAS_AGP
-static __inline__ struct page *drm_do_vm_nopage(struct vm_area_struct *vma,
-						unsigned long address)
+static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 {
 	struct drm_file *priv = vma->vm_file->private_data;
 	struct drm_device *dev = priv->minor->dev;
@@ -105,19 +105,24 @@ static __inline__ struct page *drm_do_vm_nopage(struct vm_area_struct *vma,
 	 * Find the right map
 	 */
 	if (!drm_core_has_AGP(dev))
-		goto vm_nopage_error;
+		goto vm_fault_error;
 
 	if (!dev->agp || !dev->agp->cant_use_aperture)
-		goto vm_nopage_error;
+		goto vm_fault_error;
 
 	if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash))
-		goto vm_nopage_error;
+		goto vm_fault_error;
 
 	r_list = drm_hash_entry(hash, struct drm_map_list, hash);
 	map = r_list->map;
 
 	if (map && map->type == _DRM_AGP) {
-		unsigned long offset = address - vma->vm_start;
+		/*
+		 * Using vm_pgoff as a selector forces us to use this unusual
+		 * addressing scheme.
+		 */
+		unsigned long offset = (unsigned long)vmf->virtual_address -
+								vma->vm_start;
 		unsigned long baddr = map->offset + offset;
 		struct drm_agp_mem *agpmem;
 		struct page *page;
@@ -139,7 +144,7 @@ static __inline__ struct page *drm_do_vm_nopage(struct vm_area_struct *vma,
 		}
 
 		if (!agpmem)
-			goto vm_nopage_error;
+			goto vm_fault_error;
 
 		/*
 		 * Get the page, inc the use count, and return it
@@ -147,25 +152,21 @@ static __inline__ struct page *drm_do_vm_nopage(struct vm_area_struct *vma,
 		offset = (baddr - agpmem->bound) >> PAGE_SHIFT;
 		page = virt_to_page(__va(agpmem->memory->memory[offset]));
 		get_page(page);
+		vmf->page = page;
 
-#if 0
-		/* page_count() not defined everywhere */
 		DRM_DEBUG
 		    ("baddr = 0x%lx page = 0x%p, offset = 0x%lx, count=%d\n",
 		     baddr, __va(agpmem->memory->memory[offset]), offset,
 		     page_count(page));
-#endif
-
-		return page;
+		return 0;
 	}
-      vm_nopage_error:
-	return NOPAGE_SIGBUS;	/* Disallow mremap */
+vm_fault_error:
+	return VM_FAULT_SIGBUS;	/* Disallow mremap */
 }
 #else				/* __OS_HAS_AGP */
-static __inline__ struct page *drm_do_vm_nopage(struct vm_area_struct *vma,
-						unsigned long address)
+static int drm_do_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 {
-	return NOPAGE_SIGBUS;
+	return VM_FAULT_SIGBUS;
 }
 #endif				/* __OS_HAS_AGP */
 
@@ -179,29 +180,28 @@ static __inline__ struct page *drm_do_vm_nopage(struct vm_area_struct *vma,
  * Get the mapping, find the real physical page to map, get the page, and
  * return it.
  */
-static __inline__ struct page *drm_do_vm_shm_nopage(struct vm_area_struct *vma,
-						    unsigned long address)
+static int drm_do_vm_shm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 {
 	struct drm_map *map = (struct drm_map *) vma->vm_private_data;
 	unsigned long offset;
 	unsigned long i;
 	struct page *page;
 
-	if (address > vma->vm_end)
-		return NOPAGE_SIGBUS;	/* Disallow mremap */
 	if (!map)
-		return NOPAGE_SIGBUS;	/* Nothing allocated */
+		return VM_FAULT_SIGBUS;	/* Nothing allocated */
 
-	offset = address - vma->vm_start;
+	offset = (unsigned long)vmf->virtual_address - vma->vm_start;
 	i = (unsigned long)map->handle + offset;
 	page = vmalloc_to_page((void *)i);
 	if (!page)
-		return NOPAGE_SIGBUS;
+		return VM_FAULT_SIGBUS;
 	get_page(page);
+	vmf->page = page;
 
-	DRM_DEBUG("0x%lx\n", address);
-	return page;
+	DRM_DEBUG("shm_fault 0x%lx\n", offset);
+	return 0;
 }
+#endif
 
 /**
  * \c close method for shared virtual memory.
@@ -283,8 +283,9 @@ static void drm_vm_shm_close(struct vm_area_struct *vma)
 	mutex_unlock(&dev->struct_mutex);
 }
 
+#ifndef DRM_VM_NOPAGE
 /**
- * \c nopage method for DMA virtual memory.
+ * \c fault method for DMA virtual memory.
  *
  * \param vma virtual memory area.
  * \param address access address.
@@ -292,8 +293,7 @@ static void drm_vm_shm_close(struct vm_area_struct *vma)
  *
  * Determine the page number from the page offset and get it from drm_device_dma::pagelist.
  */
-static __inline__ struct page *drm_do_vm_dma_nopage(struct vm_area_struct *vma,
-						    unsigned long address)
+static int drm_do_vm_dma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 {
 	struct drm_file *priv = vma->vm_file->private_data;
 	struct drm_device *dev = priv->minor->dev;
@@ -303,24 +303,23 @@ static __inline__ struct page *drm_do_vm_dma_nopage(struct vm_area_struct *vma,
 	struct page *page;
 
 	if (!dma)
-		return NOPAGE_SIGBUS;	/* Error */
-	if (address > vma->vm_end)
-		return NOPAGE_SIGBUS;	/* Disallow mremap */
+		return VM_FAULT_SIGBUS;	/* Error */
 	if (!dma->pagelist)
-		return NOPAGE_SIGBUS;	/* Nothing allocated */
+		return VM_FAULT_SIGBUS;	/* Nothing allocated */
 
-	offset = address - vma->vm_start;	/* vm_[pg]off[set] should be 0 */
-	page_nr = offset >> PAGE_SHIFT;
+	offset = (unsigned long)vmf->virtual_address - vma->vm_start;	/* vm_[pg]off[set] should be 0 */
+	page_nr = offset >> PAGE_SHIFT; /* page_nr could just be vmf->pgoff */
 	page = virt_to_page((dma->pagelist[page_nr] + (offset & (~PAGE_MASK))));
 
 	get_page(page);
+	vmf->page = page;
 
-	DRM_DEBUG("0x%lx (page %lu)\n", address, page_nr);
-	return page;
+	DRM_DEBUG("dma_fault 0x%lx (page %lu)\n", offset, page_nr);
+	return 0;
 }
 
 /**
- * \c nopage method for scatter-gather virtual memory.
+ * \c fault method for scatter-gather virtual memory.
  *
  * \param vma virtual memory area.
  * \param address access address.
@@ -328,8 +327,7 @@ static __inline__ struct page *drm_do_vm_dma_nopage(struct vm_area_struct *vma,
  *
  * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist.
  */
-static __inline__ struct page *drm_do_vm_sg_nopage(struct vm_area_struct *vma,
-						   unsigned long address)
+static int drm_do_vm_sg_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 {
 	struct drm_map *map = (struct drm_map *) vma->vm_private_data;
 	struct drm_file *priv = vma->vm_file->private_data;
@@ -340,80 +338,62 @@ static __inline__ struct page *drm_do_vm_sg_nopage(struct vm_area_struct *vma,
 	unsigned long page_offset;
 	struct page *page;
 
-	DRM_DEBUG("\n");
 	if (!entry)
-		return NOPAGE_SIGBUS;	/* Error */
-	if (address > vma->vm_end)
-		return NOPAGE_SIGBUS;	/* Disallow mremap */
+		return VM_FAULT_SIGBUS;	/* Error */
 	if (!entry->pagelist)
-		return NOPAGE_SIGBUS;	/* Nothing allocated */
+		return VM_FAULT_SIGBUS;	/* Nothing allocated */
 
-	offset = address - vma->vm_start;
+	offset = (unsigned long)vmf->virtual_address - vma->vm_start;
 	map_offset = map->offset - (unsigned long)dev->sg->virtual;
 	page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT);
 	page = entry->pagelist[page_offset];
 	get_page(page);
+	vmf->page = page;
 
-	return page;
-}
-
-static struct page *drm_vm_nopage(struct vm_area_struct *vma,
-				  unsigned long address, int *type)
-{
-	if (type)
-		*type = VM_FAULT_MINOR;
-	return drm_do_vm_nopage(vma, address);
-}
-
-static struct page *drm_vm_shm_nopage(struct vm_area_struct *vma,
-				      unsigned long address, int *type)
-{
-	if (type)
-		*type = VM_FAULT_MINOR;
-	return drm_do_vm_shm_nopage(vma, address);
-}
-
-static struct page *drm_vm_dma_nopage(struct vm_area_struct *vma,
-				      unsigned long address, int *type)
-{
-	if (type)
-		*type = VM_FAULT_MINOR;
-	return drm_do_vm_dma_nopage(vma, address);
-}
-
-static struct page *drm_vm_sg_nopage(struct vm_area_struct *vma,
-				     unsigned long address, int *type)
-{
-	if (type)
-		*type = VM_FAULT_MINOR;
-	return drm_do_vm_sg_nopage(vma, address);
+	return 0;
 }
-
+#endif
 
 /** AGP virtual memory operations */
 static struct vm_operations_struct drm_vm_ops = {
+#ifdef DRM_VM_NOPAGE
 	.nopage = drm_vm_nopage,
+#else
+	.fault = drm_do_vm_fault,
+#endif
 	.open = drm_vm_open,
 	.close = drm_vm_close,
 };
 
 /** Shared virtual memory operations */
 static struct vm_operations_struct drm_vm_shm_ops = {
+#ifdef DRM_VM_NOPAGE
 	.nopage = drm_vm_shm_nopage,
+#else
+	.fault = drm_do_vm_shm_fault,
+#endif
 	.open = drm_vm_open,
 	.close = drm_vm_shm_close,
 };
 
 /** DMA virtual memory operations */
 static struct vm_operations_struct drm_vm_dma_ops = {
+#ifdef DRM_VM_NOPAGE
 	.nopage = drm_vm_dma_nopage,
+#else
+	.fault = drm_do_vm_dma_fault,
+#endif
 	.open = drm_vm_open,
 	.close = drm_vm_close,
 };
 
 /** Scatter-gather virtual memory operations */
 static struct vm_operations_struct drm_vm_sg_ops = {
+#ifdef DRM_VM_NOPAGE
 	.nopage = drm_vm_sg_nopage,
+#else
+	.fault = drm_do_vm_sg_fault,
+#endif
 	.open = drm_vm_open,
 	.close = drm_vm_close,
 };
diff --git a/linux-core/drm_vm_nopage_compat.c b/linux-core/drm_vm_nopage_compat.c
new file mode 100644
index 00000000..be8d6c1c
--- /dev/null
+++ b/linux-core/drm_vm_nopage_compat.c
@@ -0,0 +1,267 @@
+/**
+ * \file drm_vm.c
+ * Memory mapping for DRM
+ *
+ * \author Rickard E. (Rik) Faith <faith@valinux.com>
+ * \author Gareth Hughes <gareth@valinux.com>
+ */
+
+/*
+ * Created: Mon Jan  4 08:58:31 1999 by faith@valinux.com
+ *
+ * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
+ * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include "drmP.h"
+
+#ifdef DRM_VM_NOPAGE
+/**
+ * \c nopage method for AGP virtual memory.
+ *
+ * \param vma virtual memory area.
+ * \param address access address.
+ * \return pointer to the page structure.
+ *
+ * Find the right map and if it's AGP memory find the real physical page to
+ * map, get the page, increment the use count and return it.
+ */
+#if __OS_HAS_AGP
+static __inline__ struct page *drm_do_vm_nopage(struct vm_area_struct *vma,
+						unsigned long address)
+{
+	struct drm_file *priv = vma->vm_file->private_data;
+	struct drm_device *dev = priv->minor->dev;
+	struct drm_map *map = NULL;
+	struct drm_map_list *r_list;
+	struct drm_hash_item *hash;
+
+	/*
+	 * Find the right map
+	 */
+	if (!drm_core_has_AGP(dev))
+		goto vm_nopage_error;
+
+	if (!dev->agp || !dev->agp->cant_use_aperture)
+		goto vm_nopage_error;
+
+	if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash))
+		goto vm_nopage_error;
+
+	r_list = drm_hash_entry(hash, struct drm_map_list, hash);
+	map = r_list->map;
+
+	if (map && map->type == _DRM_AGP) {
+		unsigned long offset = address - vma->vm_start;
+		unsigned long baddr = map->offset + offset;
+		struct drm_agp_mem *agpmem;
+		struct page *page;
+
+#ifdef __alpha__
+		/*
+		 * Adjust to a bus-relative address
+		 */
+		baddr -= dev->hose->mem_space->start;
+#endif
+
+		/*
+		 * It's AGP memory - find the real physical page to map
+		 */
+		list_for_each_entry(agpmem, &dev->agp->memory, head) {
+			if (agpmem->bound <= baddr &&
+			    agpmem->bound + agpmem->pages * PAGE_SIZE > baddr)
+				break;
+		}
+
+		if (!agpmem)
+			goto vm_nopage_error;
+
+		/*
+		 * 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]));
+		get_page(page);
+
+#if 0
+		/* page_count() not defined everywhere */
+		DRM_DEBUG
+		    ("baddr = 0x%lx page = 0x%p, offset = 0x%lx, count=%d\n",
+		     baddr, __va(agpmem->memory->memory[offset]), offset,
+		     page_count(page));
+#endif
+
+		return page;
+	}
+      vm_nopage_error:
+	return NOPAGE_SIGBUS;	/* Disallow mremap */
+}
+#else				/* __OS_HAS_AGP */
+static __inline__ struct page *drm_do_vm_nopage(struct vm_area_struct *vma,
+						unsigned long address)
+{
+	return NOPAGE_SIGBUS;
+}
+#endif				/* __OS_HAS_AGP */
+
+/**
+ * \c nopage method for shared virtual memory.
+ *
+ * \param vma virtual memory area.
+ * \param address access address.
+ * \return pointer to the page structure.
+ *
+ * Get the mapping, find the real physical page to map, get the page, and
+ * return it.
+ */
+static __inline__ struct page *drm_do_vm_shm_nopage(struct vm_area_struct *vma,
+						    unsigned long address)
+{
+	struct drm_map *map = (struct drm_map *) vma->vm_private_data;
+	unsigned long offset;
+	unsigned long i;
+	struct page *page;
+
+	if (address > vma->vm_end)
+		return NOPAGE_SIGBUS;	/* Disallow mremap */
+	if (!map)
+		return NOPAGE_SIGBUS;	/* Nothing allocated */
+
+	offset = address - vma->vm_start;
+	i = (unsigned long)map->handle + offset;
+	page = vmalloc_to_page((void *)i);
+	if (!page)
+		return NOPAGE_SIGBUS;
+	get_page(page);
+
+	DRM_DEBUG("0x%lx\n", address);
+	return page;
+}
+
+/**
+ * \c nopage method for DMA virtual memory.
+ *
+ * \param vma virtual memory area.
+ * \param address access address.
+ * \return pointer to the page structure.
+ *
+ * Determine the page number from the page offset and get it from drm_device_dma::pagelist.
+ */
+static __inline__ struct page *drm_do_vm_dma_nopage(struct vm_area_struct *vma,
+						    unsigned long address)
+{
+	struct drm_file *priv = vma->vm_file->private_data;
+	struct drm_device *dev = priv->minor->dev;
+	struct drm_device_dma *dma = dev->dma;
+	unsigned long offset;
+	unsigned long page_nr;
+	struct page *page;
+
+	if (!dma)
+		return NOPAGE_SIGBUS;	/* Error */
+	if (address > vma->vm_end)
+		return NOPAGE_SIGBUS;	/* Disallow mremap */
+	if (!dma->pagelist)
+		return NOPAGE_SIGBUS;	/* Nothing allocated */
+
+	offset = address - vma->vm_start;	/* vm_[pg]off[set] should be 0 */
+	page_nr = offset >> PAGE_SHIFT;
+	page = virt_to_page((dma->pagelist[page_nr] + (offset & (~PAGE_MASK))));
+
+	get_page(page);
+
+	DRM_DEBUG("0x%lx (page %lu)\n", address, page_nr);
+	return page;
+}
+
+/**
+ * \c nopage method for scatter-gather virtual memory.
+ *
+ * \param vma virtual memory area.
+ * \param address access address.
+ * \return pointer to the page structure.
+ *
+ * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist.
+ */
+static __inline__ struct page *drm_do_vm_sg_nopage(struct vm_area_struct *vma,
+						   unsigned long address)
+{
+	struct drm_map *map = (struct drm_map *) vma->vm_private_data;
+	struct drm_file *priv = vma->vm_file->private_data;
+	struct drm_device *dev = priv->minor->dev;
+	struct drm_sg_mem *entry = dev->sg;
+	unsigned long offset;
+	unsigned long map_offset;
+	unsigned long page_offset;
+	struct page *page;
+
+	DRM_DEBUG("\n");
+	if (!entry)
+		return NOPAGE_SIGBUS;	/* Error */
+	if (address > vma->vm_end)
+		return NOPAGE_SIGBUS;	/* Disallow mremap */
+	if (!entry->pagelist)
+		return NOPAGE_SIGBUS;	/* Nothing allocated */
+
+	offset = address - vma->vm_start;
+	map_offset = map->offset - (unsigned long)dev->sg->virtual;
+	page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT);
+	page = entry->pagelist[page_offset];
+	get_page(page);
+
+	return page;
+}
+
+
+struct page *drm_vm_nopage(struct vm_area_struct *vma,
+			   unsigned long address, int *type)
+{
+	if (type)
+		*type = VM_FAULT_MINOR;
+	return drm_do_vm_nopage(vma, address);
+}
+
+struct page *drm_vm_shm_nopage(struct vm_area_struct *vma,
+			       unsigned long address, int *type)
+{
+	if (type)
+		*type = VM_FAULT_MINOR;
+	return drm_do_vm_shm_nopage(vma, address);
+}
+
+struct page *drm_vm_dma_nopage(struct vm_area_struct *vma,
+			       unsigned long address, int *type)
+{
+	if (type)
+		*type = VM_FAULT_MINOR;
+	return drm_do_vm_dma_nopage(vma, address);
+}
+
+struct page *drm_vm_sg_nopage(struct vm_area_struct *vma,
+			      unsigned long address, int *type)
+{
+	if (type)
+		*type = VM_FAULT_MINOR;
+	return drm_do_vm_sg_nopage(vma, address);
+}
+#endif