Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / gpu / drm / drm_memory.c

diff --git a/kernel/drivers/gpu/drm/drm_memory.c b/kernel/drivers/gpu/drm/drm_memory.c
new file mode 100644 (file)
index 0000000..a521ef6
--- /dev/null
+++ b/kernel/drivers/gpu/drm/drm_memory.c
@@ -0,0 +1,151 @@
+/**
+ * \file drm_memory.c
+ * Memory management wrappers for DRM
+ *
+ * \author Rickard E. (Rik) Faith <faith@valinux.com>
+ * \author Gareth Hughes <gareth@valinux.com>
+ */
+
+/*
+ * Created: Thu Feb  4 14:00:34 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 <linux/highmem.h>
+#include <linux/export.h>
+#include <drm/drmP.h>
+#include "drm_legacy.h"
+
+#if __OS_HAS_AGP
+
+#ifdef HAVE_PAGE_AGP
+# include <asm/agp.h>
+#else
+# ifdef __powerpc__
+#  define PAGE_AGP     __pgprot(_PAGE_KERNEL | _PAGE_NO_CACHE)
+# else
+#  define PAGE_AGP     PAGE_KERNEL
+# endif
+#endif
+
+static void *agp_remap(unsigned long offset, unsigned long size,
+                      struct drm_device * dev)
+{
+       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);
+
+#ifdef __alpha__
+       offset -= dev->hose->mem_space->start;
+#endif
+
+       list_for_each_entry(agpmem, &dev->agp->memory, head)
+               if (agpmem->bound <= offset
+                   && (agpmem->bound + (agpmem->pages << PAGE_SHIFT)) >=
+                   (offset + size))
+                       break;
+       if (&agpmem->head == &dev->agp->memory)
+               return NULL;
+
+       /*
+        * OK, we're mapping AGP space on a chipset/platform on which memory accesses by
+        * the CPU do not get remapped by the GART.  We fix this by using the kernel's
+        * page-table instead (that's probably faster anyhow...).
+        */
+       /* note: use vmalloc() because num_pages could be large... */
+       page_map = vmalloc(num_pages * sizeof(struct page *));
+       if (!page_map)
+               return NULL;
+
+       phys_page_map = (agpmem->memory->pages + (offset - agpmem->bound) / PAGE_SIZE);
+       for (i = 0; i < num_pages; ++i)
+               page_map[i] = phys_page_map[i];
+       addr = vmap(page_map, num_pages, VM_IOREMAP, PAGE_AGP);
+       vfree(page_map);
+
+       return addr;
+}
+
+/** Wrapper around agp_free_memory() */
+void drm_free_agp(struct agp_memory * handle, int pages)
+{
+       agp_free_memory(handle);
+}
+
+/** Wrapper around agp_bind_memory() */
+int drm_bind_agp(struct agp_memory * handle, unsigned int start)
+{
+       return agp_bind_memory(handle, start);
+}
+
+/** Wrapper around agp_unbind_memory() */
+int drm_unbind_agp(struct agp_memory * handle)
+{
+       return agp_unbind_memory(handle);
+}
+
+#else  /*  __OS_HAS_AGP  */
+static inline void *agp_remap(unsigned long offset, unsigned long size,
+                             struct drm_device * dev)
+{
+       return NULL;
+}
+
+#endif                         /* agp */
+
+void drm_legacy_ioremap(struct drm_local_map *map, struct drm_device *dev)
+{
+       if (dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
+               map->handle = agp_remap(map->offset, map->size, dev);
+       else
+               map->handle = ioremap(map->offset, map->size);
+}
+EXPORT_SYMBOL(drm_legacy_ioremap);
+
+void drm_legacy_ioremap_wc(struct drm_local_map *map, struct drm_device *dev)
+{
+       if (dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
+               map->handle = agp_remap(map->offset, map->size, dev);
+       else
+               map->handle = ioremap_wc(map->offset, map->size);
+}
+EXPORT_SYMBOL(drm_legacy_ioremap_wc);
+
+void drm_legacy_ioremapfree(struct drm_local_map *map, struct drm_device *dev)
+{
+       if (!map->handle || !map->size)
+               return;
+
+       if (dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
+               vunmap(map->handle);
+       else
+               iounmap(map->handle);
+}
+EXPORT_SYMBOL(drm_legacy_ioremapfree);