static int drm_set_caching(struct drm_ttm *ttm, int noncached)
{
int i;
struct page **cur_page;
int do_tlbflush = 0;
if ((ttm->page_flags & DRM_TTM_PAGE_UNCACHED) == noncached)
return 0;
if (noncached)
drm_ttm_cache_flush();
for (i = 0; i < ttm->num_pages; ++i) {
cur_page = ttm->pages + i;
if (*cur_page) {
if (!PageHighMem(*cur_page)) {
if (noncached) {
map_page_into_agp(*cur_page);
} else {
unmap_page_from_agp(*cur_page);
}
do_tlbflush = 1;
}
}
}
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,25))
if (do_tlbflush) {
flush_agp_mappings();
}
#endif
DRM_FLAG_MASKED(ttm->page_flags, noncached, DRM_TTM_PAGE_UNCACHED);
return 0;
}
/* cannot be __exit b/c as it could be called from __init code */
static void agp_backend_cleanup(struct agp_bridge_data *bridge)
{
if (bridge->driver->cleanup)
bridge->driver->cleanup();
if (bridge->driver->free_gatt_table)
bridge->driver->free_gatt_table(bridge);
vfree(bridge->key_list);
bridge->key_list = NULL;
if (bridge->driver->agp_destroy_page &&
bridge->driver->needs_scratch_page) {
bridge->driver->agp_destroy_page(
gart_to_virt(bridge->scratch_page_real));
flush_agp_mappings();
}
}
static int agp_backend_initialize(struct agp_bridge_data *bridge)
{
int size_value, rc, got_gatt=0, got_keylist=0;
bridge->max_memory_agp = agp_find_max();
bridge->version = &agp_current_version;
if (bridge->driver->needs_scratch_page) {
void *addr = bridge->driver->agp_alloc_page(bridge);
if (!addr) {
printk(KERN_ERR PFX "unable to get memory for scratch page.\n");
return -ENOMEM;
}
flush_agp_mappings();
bridge->scratch_page_real = virt_to_gart(addr);
bridge->scratch_page =
bridge->driver->mask_memory(bridge, bridge->scratch_page_real, 0);
}
size_value = bridge->driver->fetch_size();
if (size_value == 0) {
printk(KERN_ERR PFX "unable to determine aperture size.\n");
rc = -EINVAL;
goto err_out;
}
if (bridge->driver->create_gatt_table(bridge)) {
printk(KERN_ERR PFX
"unable to get memory for graphics translation table.\n");
rc = -ENOMEM;
goto err_out;
}
got_gatt = 1;
bridge->key_list = vmalloc(PAGE_SIZE * 4);
if (bridge->key_list == NULL) {
printk(KERN_ERR PFX "error allocating memory for key lists.\n");
rc = -ENOMEM;
goto err_out;
}
got_keylist = 1;
/* FIXME vmalloc'd memory not guaranteed contiguous */
memset(bridge->key_list, 0, PAGE_SIZE * 4);
if (bridge->driver->configure()) {
printk(KERN_ERR PFX "error configuring host chipset.\n");
rc = -EINVAL;
goto err_out;
}
return 0;
err_out:
if (bridge->driver->needs_scratch_page) {
bridge->driver->agp_destroy_page(
gart_to_virt(bridge->scratch_page_real));
flush_agp_mappings();
}
if (got_gatt)
bridge->driver->free_gatt_table(bridge);
if (got_keylist) {
vfree(bridge->key_list);
bridge->key_list = NULL;
}
return rc;
}