static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
{
struct ttm_bo_global *glob =
container_of(shrink, struct ttm_bo_global, shrink);
struct ttm_buffer_object *bo;
int ret = -EBUSY;
int put_count;
uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
spin_lock(&glob->lru_lock);
while (ret == -EBUSY) {
if (unlikely(list_empty(&glob->swap_lru))) {
spin_unlock(&glob->lru_lock);
return -EBUSY;
}
bo = list_first_entry(&glob->swap_lru,
struct ttm_buffer_object, swap);
kref_get(&bo->list_kref);
if (!list_empty(&bo->ddestroy)) {
spin_unlock(&glob->lru_lock);
(void) ttm_bo_cleanup_refs(bo, false, false, false);
kref_put(&bo->list_kref, ttm_bo_release_list);
continue;
}
/**
* Reserve buffer. Since we unlock while sleeping, we need
* to re-check that nobody removed us from the swap-list while
* we slept.
*/
ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
if (unlikely(ret == -EBUSY)) {
spin_unlock(&glob->lru_lock);
ttm_bo_wait_unreserved(bo, false);
kref_put(&bo->list_kref, ttm_bo_release_list);
spin_lock(&glob->lru_lock);
}
}
BUG_ON(ret != 0);
put_count = ttm_bo_del_from_lru(bo);
spin_unlock(&glob->lru_lock);
ttm_bo_list_ref_sub(bo, put_count, true);
/**
* Wait for GPU, then move to system cached.
*/
spin_lock(&bo->bdev->fence_lock);
ret = ttm_bo_wait(bo, false, false, false);
spin_unlock(&bo->bdev->fence_lock);
if (unlikely(ret != 0))
goto out;
if ((bo->mem.placement & swap_placement) != swap_placement) {
struct ttm_mem_reg evict_mem;
evict_mem = bo->mem;
evict_mem.mm_node = NULL;
evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
evict_mem.mem_type = TTM_PL_SYSTEM;
ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
false, false, false);
if (unlikely(ret != 0))
goto out;
}
ttm_bo_unmap_virtual(bo);
/**
* Swap out. Buffer will be swapped in again as soon as
* anyone tries to access a ttm page.
*/
if (bo->bdev->driver->swap_notify)
bo->bdev->driver->swap_notify(bo);
ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
out:
/**
*
* Unreserve without putting on LRU to avoid swapping out an
* already swapped buffer.
*/
atomic_set(&bo->reserved, 0);
wake_up_all(&bo->event_queue);
kref_put(&bo->list_kref, ttm_bo_release_list);
return ret;
}
static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
struct ttm_mem_reg *mem,
bool evict, bool interruptible,
bool no_wait_reserve, bool no_wait_gpu)
{
struct ttm_bo_device *bdev = bo->bdev;
bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);
bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);
struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];
struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];
int ret = 0;
if (old_is_pci || new_is_pci ||
((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0))
ttm_bo_unmap_virtual(bo);
/*
* Create and bind a ttm if required.
*/
if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && (bo->ttm == NULL)) {
ret = ttm_bo_add_ttm(bo, false);
if (ret)
goto out_err;
ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
if (ret)
goto out_err;
if (mem->mem_type != TTM_PL_SYSTEM) {
ret = ttm_tt_bind(bo->ttm, mem);
if (ret)
goto out_err;
}
if (bo->mem.mem_type == TTM_PL_SYSTEM) {
bo->mem = *mem;
mem->mm_node = NULL;
goto moved;
}
}
if (bdev->driver->move_notify)
bdev->driver->move_notify(bo, mem);
if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))
ret = ttm_bo_move_ttm(bo, evict, no_wait_reserve, no_wait_gpu, mem);
else if (bdev->driver->move)
ret = bdev->driver->move(bo, evict, interruptible,
no_wait_reserve, no_wait_gpu, mem);
else
ret = ttm_bo_move_memcpy(bo, evict, no_wait_reserve, no_wait_gpu, mem);
if (ret)
goto out_err;
moved:
if (bo->evicted) {
ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);
if (ret)
printk(KERN_ERR TTM_PFX "Can not flush read caches\n");
bo->evicted = false;
}
if (bo->mem.mm_node) {
spin_lock(&bo->lock);
bo->offset = (bo->mem.mm_node->start << PAGE_SHIFT) +
bdev->man[bo->mem.mem_type].gpu_offset;
bo->cur_placement = bo->mem.placement;
spin_unlock(&bo->lock);
} else
bo->offset = 0;
return 0;
out_err:
new_man = &bdev->man[bo->mem.mem_type];
if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {
ttm_tt_unbind(bo->ttm);
ttm_tt_destroy(bo->ttm);
bo->ttm = NULL;
}
return ret;
}