drm/linux-core/drm_ttm.c

522 lines
11 KiB
C

/**************************************************************************
*
* Copyright 2006 Tungsten Graphics, Inc., Bismarck, ND., USA
* 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, sub license, 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 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 NON-INFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDERS, AUTHORS 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.
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
*
**************************************************************************/
#include "drmP.h"
static void drm_ttm_ipi_handler(void *null)
{
flush_agp_cache();
}
static void drm_ttm_cache_flush(void)
{
if (on_each_cpu(drm_ttm_ipi_handler, NULL, 1, 1) != 0)
DRM_ERROR("Timed out waiting for drm cache flush.\n");
}
/*
* Use kmalloc if possible. Otherwise fall back to vmalloc.
*/
static void *ttm_alloc(unsigned long size, int type)
{
void *ret = NULL;
if (drm_alloc_memctl(size))
return NULL;
if (size <= PAGE_SIZE) {
ret = drm_alloc(size, type);
}
if (!ret) {
ret = vmalloc(size);
}
if (!ret) {
drm_free_memctl(size);
}
return ret;
}
static void ttm_free(void *pointer, unsigned long size, int type)
{
if ((unsigned long)pointer >= VMALLOC_START &&
(unsigned long)pointer <= VMALLOC_END) {
vfree(pointer);
} else {
drm_free(pointer, size, type);
}
drm_free_memctl(size);
}
/*
* Unmap all vma pages from vmas mapping this ttm.
*/
static int unmap_vma_pages(drm_ttm_t * ttm)
{
drm_device_t *dev = ttm->dev;
loff_t offset = ((loff_t) ttm->mapping_offset) << PAGE_SHIFT;
loff_t holelen = ((loff_t) ttm->num_pages) << PAGE_SHIFT;
#ifdef DRM_ODD_MM_COMPAT
int ret;
ret = drm_ttm_lock_mm(ttm);
if (ret)
return ret;
#endif
unmap_mapping_range(dev->dev_mapping, offset, holelen, 1);
#ifdef DRM_ODD_MM_COMPAT
drm_ttm_finish_unmap(ttm);
#endif
return 0;
}
/*
* Change caching policy for the linear kernel map
* for range of pages in a ttm.
*/
static int drm_set_caching(drm_ttm_t * 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 (do_tlbflush)
flush_agp_mappings();
DRM_MASK_VAL(ttm->page_flags, DRM_TTM_PAGE_UNCACHED, noncached);
return 0;
}
/*
* Free all resources associated with a ttm.
*/
int drm_destroy_ttm(drm_ttm_t * ttm)
{
int i;
struct page **cur_page;
drm_ttm_backend_t *be;
if (!ttm)
return 0;
if (atomic_read(&ttm->vma_count) > 0) {
ttm->destroy = 1;
DRM_ERROR("VMAs are still alive. Skipping destruction.\n");
return -EBUSY;
}
DRM_DEBUG("Destroying a ttm\n");
#ifdef DRM_TTM_ODD_COMPAT
BUG_ON(!list_empty(&ttm->vma_list));
BUG_ON(!list_empty(&ttm->p_mm_list));
#endif
be = ttm->be;
if (be) {
be->destroy(be);
ttm->be = NULL;
}
if (ttm->pages) {
drm_buffer_manager_t *bm = &ttm->dev->bm;
if (ttm->page_flags & DRM_TTM_PAGE_UNCACHED)
drm_set_caching(ttm, 0);
for (i = 0; i < ttm->num_pages; ++i) {
cur_page = ttm->pages + i;
if (*cur_page) {
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,15))
unlock_page(*cur_page);
#else
ClearPageReserved(*cur_page);
#endif
if (page_count(*cur_page) != 1) {
DRM_ERROR("Erroneous page count. "
"Leaking pages.\n");
}
if (page_mapped(*cur_page)) {
DRM_ERROR("Erroneous map count. "
"Leaking page mappings.\n");
}
/*
* End debugging.
*/
drm_free_gatt_pages(*cur_page, 0);
drm_free_memctl(PAGE_SIZE);
--bm->cur_pages;
}
}
ttm_free(ttm->pages, ttm->num_pages * sizeof(*ttm->pages),
DRM_MEM_TTM);
ttm->pages = NULL;
}
drm_ctl_free(ttm, sizeof(*ttm), DRM_MEM_TTM);
return 0;
}
static int drm_ttm_populate(drm_ttm_t * ttm)
{
struct page *page;
unsigned long i;
drm_buffer_manager_t *bm;
drm_ttm_backend_t *be;
if (ttm->state != ttm_unpopulated)
return 0;
bm = &ttm->dev->bm;
be = ttm->be;
for (i = 0; i < ttm->num_pages; ++i) {
page = ttm->pages[i];
if (!page) {
if (drm_alloc_memctl(PAGE_SIZE)) {
return -ENOMEM;
}
page = drm_alloc_gatt_pages(0);
if (!page) {
drm_free_memctl(PAGE_SIZE);
return -ENOMEM;
}
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,15))
SetPageLocked(page);
#else
SetPageReserved(page);
#endif
clear_page(kmap(page));
kunmap(page);
ttm->pages[i] = page;
++bm->cur_pages;
}
}
be->populate(be, ttm->num_pages, ttm->pages);
ttm->state = ttm_unbound;
return 0;
}
/*
* Initialize a ttm.
*/
static drm_ttm_t *drm_init_ttm(struct drm_device *dev, unsigned long size)
{
drm_bo_driver_t *bo_driver = dev->driver->bo_driver;
drm_ttm_t *ttm;
if (!bo_driver)
return NULL;
ttm = drm_ctl_calloc(1, sizeof(*ttm), DRM_MEM_TTM);
if (!ttm)
return NULL;
#ifdef DRM_ODD_MM_COMPAT
INIT_LIST_HEAD(&ttm->p_mm_list);
INIT_LIST_HEAD(&ttm->vma_list);
#endif
ttm->dev = dev;
atomic_set(&ttm->vma_count, 0);
ttm->destroy = 0;
ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
ttm->page_flags = 0;
/*
* Account also for AGP module memory usage.
*/
ttm->pages = ttm_alloc(ttm->num_pages * sizeof(*ttm->pages),
DRM_MEM_TTM);
if (!ttm->pages) {
drm_destroy_ttm(ttm);
DRM_ERROR("Failed allocating page table\n");
return NULL;
}
memset(ttm->pages, 0, ttm->num_pages * sizeof(*ttm->pages));
ttm->be = bo_driver->create_ttm_backend_entry(dev);
if (!ttm->be) {
drm_destroy_ttm(ttm);
DRM_ERROR("Failed creating ttm backend entry\n");
return NULL;
}
ttm->state = ttm_unpopulated;
return ttm;
}
/*
* Unbind a ttm region from the aperture.
*/
int drm_evict_ttm(drm_ttm_t * ttm)
{
drm_ttm_backend_t *be = ttm->be;
int ret;
switch (ttm->state) {
case ttm_bound:
if (be->needs_ub_cache_adjust(be)) {
ret = unmap_vma_pages(ttm);
if (ret) {
return ret;
}
}
be->unbind(be);
break;
default:
break;
}
ttm->state = ttm_evicted;
return 0;
}
void drm_fixup_ttm_caching(drm_ttm_t * ttm)
{
if (ttm->state == ttm_evicted) {
drm_ttm_backend_t *be = ttm->be;
if (be->needs_ub_cache_adjust(be)) {
drm_set_caching(ttm, 0);
}
ttm->state = ttm_unbound;
}
}
int drm_unbind_ttm(drm_ttm_t * ttm)
{
int ret = 0;
if (ttm->state == ttm_bound)
ret = drm_evict_ttm(ttm);
if (ret)
return ret;
drm_fixup_ttm_caching(ttm);
return 0;
}
int drm_bind_ttm(drm_ttm_t * ttm, int cached, unsigned long aper_offset)
{
int ret = 0;
drm_ttm_backend_t *be;
if (!ttm)
return -EINVAL;
if (ttm->state == ttm_bound)
return 0;
be = ttm->be;
ret = drm_ttm_populate(ttm);
if (ret)
return ret;
if (ttm->state == ttm_unbound && !cached) {
ret = unmap_vma_pages(ttm);
if (ret)
return ret;
drm_set_caching(ttm, DRM_TTM_PAGE_UNCACHED);
}
#ifdef DRM_ODD_MM_COMPAT
else if (ttm->state == ttm_evicted && !cached) {
ret = drm_ttm_lock_mm(ttm);
if (ret)
return ret;
}
#endif
if ((ret = be->bind(be, aper_offset, cached))) {
ttm->state = ttm_evicted;
#ifdef DRM_ODD_MM_COMPAT
if (be->needs_ub_cache_adjust(be))
drm_ttm_unlock_mm(ttm);
#endif
DRM_ERROR("Couldn't bind backend.\n");
return ret;
}
ttm->aper_offset = aper_offset;
ttm->state = ttm_bound;
#ifdef DRM_ODD_MM_COMPAT
if (be->needs_ub_cache_adjust(be)) {
ret = drm_ttm_remap_bound(ttm);
if (ret)
return ret;
}
#endif
return 0;
}
/*
* dev->struct_mutex locked.
*/
static void drm_ttm_object_remove(drm_device_t * dev, drm_ttm_object_t * object)
{
drm_map_list_t *list = &object->map_list;
drm_local_map_t *map;
if (list->user_token)
drm_ht_remove_item(&dev->map_hash, &list->hash);
if (list->file_offset_node) {
drm_mm_put_block(list->file_offset_node);
list->file_offset_node = NULL;
}
map = list->map;
if (map) {
drm_ttm_t *ttm = (drm_ttm_t *) map->offset;
if (ttm) {
if (drm_destroy_ttm(ttm) != -EBUSY) {
drm_ctl_free(map, sizeof(*map), DRM_MEM_TTM);
}
} else {
drm_ctl_free(map, sizeof(*map), DRM_MEM_TTM);
}
}
drm_ctl_free(object, sizeof(*object), DRM_MEM_TTM);
}
void drm_ttm_object_deref_locked(drm_device_t * dev, drm_ttm_object_t * to)
{
if (atomic_dec_and_test(&to->usage)) {
drm_ttm_object_remove(dev, to);
}
}
void drm_ttm_object_deref_unlocked(drm_device_t * dev, drm_ttm_object_t * to)
{
if (atomic_dec_and_test(&to->usage)) {
mutex_lock(&dev->struct_mutex);
if (atomic_read(&to->usage) == 0)
drm_ttm_object_remove(dev, to);
mutex_unlock(&dev->struct_mutex);
}
}
/*
* Create a ttm and add it to the drm book-keeping.
* dev->struct_mutex locked.
*/
int drm_ttm_object_create(drm_device_t * dev, unsigned long size,
uint32_t flags, drm_ttm_object_t ** ttm_object)
{
drm_ttm_object_t *object;
drm_map_list_t *list;
drm_local_map_t *map;
drm_ttm_t *ttm;
object = drm_ctl_calloc(1, sizeof(*object), DRM_MEM_TTM);
if (!object)
return -ENOMEM;
object->flags = flags;
list = &object->map_list;
list->map = drm_ctl_calloc(1, sizeof(*map), DRM_MEM_TTM);
if (!list->map) {
drm_ttm_object_remove(dev, object);
return -ENOMEM;
}
map = list->map;
ttm = drm_init_ttm(dev, size);
if (!ttm) {
DRM_ERROR("Could not create ttm\n");
drm_ttm_object_remove(dev, object);
return -ENOMEM;
}
map->offset = (unsigned long)ttm;
map->type = _DRM_TTM;
map->flags = _DRM_REMOVABLE;
map->size = ttm->num_pages * PAGE_SIZE;
map->handle = (void *)object;
/*
* Add a one-page "hole" to the block size to avoid the mm subsystem
* merging vmas.
* FIXME: Is this really needed?
*/
list->file_offset_node = drm_mm_search_free(&dev->offset_manager,
ttm->num_pages + 1, 0, 0);
if (!list->file_offset_node) {
drm_ttm_object_remove(dev, object);
return -ENOMEM;
}
list->file_offset_node = drm_mm_get_block(list->file_offset_node,
ttm->num_pages + 1, 0);
list->hash.key = list->file_offset_node->start;
if (drm_ht_insert_item(&dev->map_hash, &list->hash)) {
drm_ttm_object_remove(dev, object);
return -ENOMEM;
}
list->user_token = ((drm_u64_t) list->hash.key) << PAGE_SHIFT;
ttm->mapping_offset = list->hash.key;
atomic_set(&object->usage, 1);
*ttm_object = object;
return 0;
}