Merge branch 'upstream-linus' of master.kernel.org:/pub/scm/linux/kernel/git/mfasheh...

[linux-2.6-omap-h63xx.git] / drivers / char / drm / drm_memory.c

diff --git a/drivers/char/drm/drm_memory.c b/drivers/char/drm/drm_memory.c
index dddf8de661433cc21758fc5f1b98d25c775f483c..92a867082376cead936dbb818eaaba212e0f18e5 100644 (file)
--- a/drivers/char/drm/drm_memory.c
+++ b/drivers/char/drm/drm_memory.c
@@ -33,7 +33,6 @@
  * OTHER DEALINGS IN THE SOFTWARE.
  */
 
-#include <linux/config.h>
 #include <linux/highmem.h>
 #include "drmP.h"
 
@@ -80,6 +79,49 @@ void *drm_realloc(void *oldpt, size_t oldsize, size_t size, int area)
 }
 
 #if __OS_HAS_AGP
+static void *agp_remap(unsigned long offset, unsigned long size,
+                      drm_device_t * dev)
+{
+       unsigned long *phys_addr_map, i, num_pages =
+           PAGE_ALIGN(size) / PAGE_SIZE;
+       struct drm_agp_mem *agpmem;
+       struct page **page_map;
+       void *addr;
+
+       size = PAGE_ALIGN(size);
+
+#ifdef __alpha__
+       offset -= dev->hose->mem_space->start;
+#endif
+
+       for (agpmem = dev->agp->memory; agpmem; agpmem = agpmem->next)
+               if (agpmem->bound <= offset
+                   && (agpmem->bound + (agpmem->pages << PAGE_SHIFT)) >=
+                   (offset + size))
+                       break;
+       if (!agpmem)
+               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_addr_map =
+           agpmem->memory->memory + (offset - agpmem->bound) / PAGE_SIZE;
+       for (i = 0; i < num_pages; ++i)
+               page_map[i] = pfn_to_page(phys_addr_map[i] >> PAGE_SHIFT);
+       addr = vmap(page_map, num_pages, VM_IOREMAP, PAGE_AGP);
+       vfree(page_map);
+
+       return addr;
+}
+
 /** Wrapper around agp_allocate_memory() */
 DRM_AGP_MEM *drm_alloc_agp(drm_device_t * dev, int pages, u32 type)
 {
@@ -103,5 +145,38 @@ int drm_unbind_agp(DRM_AGP_MEM * handle)
 {
        return drm_agp_unbind_memory(handle);
 }
+
+#else  /*  __OS_HAS_AGP  */
+static inline void *agp_remap(unsigned long offset, unsigned long size,
+                             drm_device_t * dev)
+{
+       return NULL;
+}
+
 #endif                         /* agp */
+
 #endif                         /* debug_memory */
+
+void drm_core_ioremap(struct drm_map *map, struct drm_device *dev)
+{
+       if (drm_core_has_AGP(dev) &&
+           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_core_ioremap);
+
+void drm_core_ioremapfree(struct drm_map *map, struct drm_device *dev)
+{
+       if (!map->handle || !map->size)
+               return;
+
+       if (drm_core_has_AGP(dev) &&
+           dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
+               vunmap(map->handle);
+       else
+               iounmap(map->handle);
+}
+EXPORT_SYMBOL(drm_core_ioremapfree);
+