X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=drivers%2Fchar%2Fdrm%2Fdrm_memory.h;fp=drivers%2Fchar%2Fdrm%2Fdrm_memory.h;h=3732a61c3762840553fd3e4470d71f050f9aaf26;hb=64ba3f394c830ec48a1c31b53dcae312c56f1604;hp=f1b97aff10cf65eb8304651dc776ccd3693271e9;hpb=be1e6109ac94a859551f8e1774eb9a8469fe055c;p=linux-2.6.git

diff --git a/drivers/char/drm/drm_memory.h b/drivers/char/drm/drm_memory.h
index f1b97aff1..3732a61c3 100644
--- a/drivers/char/drm/drm_memory.h
+++ b/drivers/char/drm/drm_memory.h
@@ -33,6 +33,7 @@
  * OTHER DEALINGS IN THE SOFTWARE.
  */
 
+#include <linux/config.h>
 #include <linux/highmem.h>
 #include <linux/vmalloc.h>
 #include "drmP.h"
@@ -56,6 +57,71 @@
 # endif
 #endif
 
+/*
+ * Find the drm_map that covers the range [offset, offset+size).
+ */
+static inline drm_map_t *drm_lookup_map(unsigned long offset,
+					unsigned long size, drm_device_t * dev)
+{
+	struct list_head *list;
+	drm_map_list_t *r_list;
+	drm_map_t *map;
+
+	list_for_each(list, &dev->maplist->head) {
+		r_list = (drm_map_list_t *) list;
+		map = r_list->map;
+		if (!map)
+			continue;
+		if (map->offset <= offset
+		    && (offset + size) <= (map->offset + map->size))
+			return map;
+	}
+	return NULL;
+}
+
+static inline 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;
+}
+
 static inline unsigned long drm_follow_page(void *vaddr)
 {
 	pgd_t *pgd = pgd_offset_k((unsigned long)vaddr);
@@ -67,6 +133,18 @@ static inline unsigned long drm_follow_page(void *vaddr)
 
 #else				/* __OS_HAS_AGP */
 
+static inline drm_map_t *drm_lookup_map(unsigned long offset,
+					unsigned long size, drm_device_t * dev)
+{
+	return NULL;
+}
+
+static inline void *agp_remap(unsigned long offset, unsigned long size,
+			      drm_device_t * dev)
+{
+	return NULL;
+}
+
 static inline unsigned long drm_follow_page(void *vaddr)
 {
 	return 0;
@@ -74,8 +152,51 @@ static inline unsigned long drm_follow_page(void *vaddr)
 
 #endif
 
-void *drm_ioremap(unsigned long offset, unsigned long size,
-				drm_device_t * dev);
+static inline void *drm_ioremap(unsigned long offset, unsigned long size,
+				drm_device_t * dev)
+{
+	if (drm_core_has_AGP(dev) && dev->agp && dev->agp->cant_use_aperture) {
+		drm_map_t *map = drm_lookup_map(offset, size, dev);
+
+		if (map && map->type == _DRM_AGP)
+			return agp_remap(offset, size, dev);
+	}
+	return ioremap(offset, size);
+}
+
+static inline void *drm_ioremap_nocache(unsigned long offset,
+					unsigned long size, drm_device_t * dev)
+{
+	if (drm_core_has_AGP(dev) && dev->agp && dev->agp->cant_use_aperture) {
+		drm_map_t *map = drm_lookup_map(offset, size, dev);
+
+		if (map && map->type == _DRM_AGP)
+			return agp_remap(offset, size, dev);
+	}
+	return ioremap_nocache(offset, size);
+}
+
+static inline void drm_ioremapfree(void *pt, unsigned long size,
+				   drm_device_t * dev)
+{
+	/*
+	 * This is a bit ugly.  It would be much cleaner if the DRM API would use separate
+	 * routines for handling mappings in the AGP space.  Hopefully this can be done in
+	 * a future revision of the interface...
+	 */
+	if (drm_core_has_AGP(dev) && dev->agp && dev->agp->cant_use_aperture
+	    && ((unsigned long)pt >= VMALLOC_START
+		&& (unsigned long)pt < VMALLOC_END)) {
+		unsigned long offset;
+		drm_map_t *map;
+
+		offset = drm_follow_page(pt) | ((unsigned long)pt & ~PAGE_MASK);
+		map = drm_lookup_map(offset, size, dev);
+		if (map && map->type == _DRM_AGP) {
+			vunmap(pt);
+			return;
+		}
+	}
 
-void drm_ioremapfree(void *pt, unsigned long size,
-				   drm_device_t * dev);
+	iounmap(pt);
+}