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

1 files changed, 267 insertions, 0 deletions

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