diff options
Diffstat (limited to 'drivers/gpu/drm/ttm/ttm_bo.c')
| -rw-r--r-- | drivers/gpu/drm/ttm/ttm_bo.c | 1941 |
1 files changed, 1941 insertions, 0 deletions
diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c new file mode 100644 index 0000000..9b07b7d --- /dev/null +++ b/drivers/gpu/drm/ttm/ttm_bo.c @@ -0,0 +1,1941 @@ +/************************************************************************** + * + * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., 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 above copyright notice and this permission notice (including the + * next paragraph) shall be included in all copies or substantial portions + * of the Software. + * + * 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. + * + **************************************************************************/ +/* + * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com> + */ + +#define pr_fmt(fmt) "[TTM] " fmt + +#include <drm/ttm/ttm_module.h> +#include <drm/ttm/ttm_bo_driver.h> +#include <drm/ttm/ttm_placement.h> +#include <linux/jiffies.h> +#include <linux/slab.h> +#include <linux/sched.h> +#include <linux/mm.h> +#include <linux/file.h> +#include <linux/module.h> +#include <linux/atomic.h> + +#define TTM_ASSERT_LOCKED(param) +#define TTM_DEBUG(fmt, arg...) +#define TTM_BO_HASH_ORDER 13 + +static int ttm_bo_setup_vm(struct ttm_buffer_object *bo); +static int ttm_bo_swapout(struct ttm_mem_shrink *shrink); +static void ttm_bo_global_kobj_release(struct kobject *kobj); + +static struct attribute ttm_bo_count = { + .name = "bo_count", + .mode = S_IRUGO +}; + +static inline int ttm_mem_type_from_flags(uint32_t flags, uint32_t *mem_type) +{ + int i; + + for (i = 0; i <= TTM_PL_PRIV5; i++) + if (flags & (1 << i)) { + *mem_type = i; + return 0; + } + return -EINVAL; +} + +static void ttm_mem_type_debug(struct ttm_bo_device *bdev, int mem_type) +{ + struct ttm_mem_type_manager *man = &bdev->man[mem_type]; + + pr_err(" has_type: %d\n", man->has_type); + pr_err(" use_type: %d\n", man->use_type); + pr_err(" flags: 0x%08X\n", man->flags); + pr_err(" gpu_offset: 0x%08lX\n", man->gpu_offset); + pr_err(" size: %llu\n", man->size); + pr_err(" available_caching: 0x%08X\n", man->available_caching); + pr_err(" default_caching: 0x%08X\n", man->default_caching); + if (mem_type != TTM_PL_SYSTEM) + (*man->func->debug)(man, TTM_PFX); +} + +static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo, + struct ttm_placement *placement) +{ + int i, ret, mem_type; + + pr_err("No space for %p (%lu pages, %luK, %luM)\n", + bo, bo->mem.num_pages, bo->mem.size >> 10, + bo->mem.size >> 20); + for (i = 0; i < placement->num_placement; i++) { + ret = ttm_mem_type_from_flags(placement->placement[i], + &mem_type); + if (ret) + return; + pr_err(" placement[%d]=0x%08X (%d)\n", + i, placement->placement[i], mem_type); + ttm_mem_type_debug(bo->bdev, mem_type); + } +} + +static ssize_t ttm_bo_global_show(struct kobject *kobj, + struct attribute *attr, + char *buffer) +{ + struct ttm_bo_global *glob = + container_of(kobj, struct ttm_bo_global, kobj); + + return snprintf(buffer, PAGE_SIZE, "%lu\n", + (unsigned long) atomic_read(&glob->bo_count)); +} + +static struct attribute *ttm_bo_global_attrs[] = { + &ttm_bo_count, + NULL +}; + +static const struct sysfs_ops ttm_bo_global_ops = { + .show = &ttm_bo_global_show +}; + +static struct kobj_type ttm_bo_glob_kobj_type = { + .release = &ttm_bo_global_kobj_release, + .sysfs_ops = &ttm_bo_global_ops, + .default_attrs = ttm_bo_global_attrs +}; + + +static inline uint32_t ttm_bo_type_flags(unsigned type) +{ + return 1 << (type); +} + +static void ttm_bo_release_list(struct kref *list_kref) +{ + struct ttm_buffer_object *bo = + container_of(list_kref, struct ttm_buffer_object, list_kref); + struct ttm_bo_device *bdev = bo->bdev; + size_t acc_size = bo->acc_size; + + BUG_ON(atomic_read(&bo->list_kref.refcount)); + BUG_ON(atomic_read(&bo->kref.refcount)); + BUG_ON(atomic_read(&bo->cpu_writers)); + BUG_ON(bo->sync_obj != NULL); + BUG_ON(bo->mem.mm_node != NULL); + BUG_ON(!list_empty(&bo->lru)); + BUG_ON(!list_empty(&bo->ddestroy)); + + if (bo->ttm) + ttm_tt_destroy(bo->ttm); + atomic_dec(&bo->glob->bo_count); + if (bo->destroy) + bo->destroy(bo); + else { + kfree(bo); + } + ttm_mem_global_free(bdev->glob->mem_glob, acc_size); +} + +static int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo, + bool interruptible) +{ + if (interruptible) { + return wait_event_interruptible(bo->event_queue, + !ttm_bo_is_reserved(bo)); + } else { + wait_event(bo->event_queue, !ttm_bo_is_reserved(bo)); + return 0; + } +} + +void ttm_bo_add_to_lru(struct ttm_buffer_object *bo) +{ + struct ttm_bo_device *bdev = bo->bdev; + struct ttm_mem_type_manager *man; + + BUG_ON(!ttm_bo_is_reserved(bo)); + + if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) { + + BUG_ON(!list_empty(&bo->lru)); + + man = &bdev->man[bo->mem.mem_type]; + list_add_tail(&bo->lru, &man->lru); + kref_get(&bo->list_kref); + + if (bo->ttm != NULL) { + list_add_tail(&bo->swap, &bo->glob->swap_lru); + kref_get(&bo->list_kref); + } + } +} + +int ttm_bo_del_from_lru(struct ttm_buffer_object *bo) +{ + int put_count = 0; + + if (!list_empty(&bo->swap)) { + list_del_init(&bo->swap); + ++put_count; + } + if (!list_empty(&bo->lru)) { + list_del_init(&bo->lru); + ++put_count; + } + + /* + * TODO: Add a driver hook to delete from + * driver-specific LRU's here. + */ + + return put_count; +} + +int ttm_bo_reserve_nolru(struct ttm_buffer_object *bo, + bool interruptible, + bool no_wait, bool use_sequence, uint32_t sequence) +{ + int ret; + + while (unlikely(atomic_xchg(&bo->reserved, 1) != 0)) { + /** + * Deadlock avoidance for multi-bo reserving. + */ + if (use_sequence && bo->seq_valid) { + /** + * We've already reserved this one. + */ + if (unlikely(sequence == bo->val_seq)) + return -EDEADLK; + /** + * Already reserved by a thread that will not back + * off for us. We need to back off. + */ + if (unlikely(sequence - bo->val_seq < (1 << 31))) + return -EAGAIN; + } + + if (no_wait) + return -EBUSY; + + ret = ttm_bo_wait_unreserved(bo, interruptible); + + if (unlikely(ret)) + return ret; + } + + if (use_sequence) { + bool wake_up = false; + /** + * Wake up waiters that may need to recheck for deadlock, + * if we decreased the sequence number. + */ + if (unlikely((bo->val_seq - sequence < (1 << 31)) + || !bo->seq_valid)) + wake_up = true; + + /* + * In the worst case with memory ordering these values can be + * seen in the wrong order. However since we call wake_up_all + * in that case, this will hopefully not pose a problem, + * and the worst case would only cause someone to accidentally + * hit -EAGAIN in ttm_bo_reserve when they see old value of + * val_seq. However this would only happen if seq_valid was + * written before val_seq was, and just means some slightly + * increased cpu usage + */ + bo->val_seq = sequence; + bo->seq_valid = true; + if (wake_up) + wake_up_all(&bo->event_queue); + } else { + bo->seq_valid = false; + } + + return 0; +} +EXPORT_SYMBOL(ttm_bo_reserve); + +static void ttm_bo_ref_bug(struct kref *list_kref) +{ + BUG(); +} + +void ttm_bo_list_ref_sub(struct ttm_buffer_object *bo, int count, + bool never_free) +{ + kref_sub(&bo->list_kref, count, + (never_free) ? ttm_bo_ref_bug : ttm_bo_release_list); +} + +int ttm_bo_reserve(struct ttm_buffer_object *bo, + bool interruptible, + bool no_wait, bool use_sequence, uint32_t sequence) +{ + struct ttm_bo_global *glob = bo->glob; + int put_count = 0; + int ret; + + ret = ttm_bo_reserve_nolru(bo, interruptible, no_wait, use_sequence, + sequence); + if (likely(ret == 0)) { + spin_lock(&glob->lru_lock); + put_count = ttm_bo_del_from_lru(bo); + spin_unlock(&glob->lru_lock); + ttm_bo_list_ref_sub(bo, put_count, true); + } + + return ret; +} + +int ttm_bo_reserve_slowpath_nolru(struct ttm_buffer_object *bo, + bool interruptible, uint32_t sequence) +{ + bool wake_up = false; + int ret; + + while (unlikely(atomic_xchg(&bo->reserved, 1) != 0)) { + WARN_ON(bo->seq_valid && sequence == bo->val_seq); + + ret = ttm_bo_wait_unreserved(bo, interruptible); + + if (unlikely(ret)) + return ret; + } + + if ((bo->val_seq - sequence < (1 << 31)) || !bo->seq_valid) + wake_up = true; + + /** + * Wake up waiters that may need to recheck for deadlock, + * if we decreased the sequence number. + */ + bo->val_seq = sequence; + bo->seq_valid = true; + if (wake_up) + wake_up_all(&bo->event_queue); + + return 0; +} + +int ttm_bo_reserve_slowpath(struct ttm_buffer_object *bo, + bool interruptible, uint32_t sequence) +{ + struct ttm_bo_global *glob = bo->glob; + int put_count, ret; + + ret = ttm_bo_reserve_slowpath_nolru(bo, interruptible, sequence); + if (likely(!ret)) { + spin_lock(&glob->lru_lock); + put_count = ttm_bo_del_from_lru(bo); + spin_unlock(&glob->lru_lock); + ttm_bo_list_ref_sub(bo, put_count, true); + } + return ret; +} +EXPORT_SYMBOL(ttm_bo_reserve_slowpath); + +void ttm_bo_unreserve_locked(struct ttm_buffer_object *bo) +{ + ttm_bo_add_to_lru(bo); + atomic_set(&bo->reserved, 0); + wake_up_all(&bo->event_queue); +} + +void ttm_bo_unreserve(struct ttm_buffer_object *bo) +{ + struct ttm_bo_global *glob = bo->glob; + + spin_lock(&glob->lru_lock); + ttm_bo_unreserve_locked(bo); + spin_unlock(&glob->lru_lock); +} +EXPORT_SYMBOL(ttm_bo_unreserve); + +/* + * Call bo->mutex locked. + */ +static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc) +{ + struct ttm_bo_device *bdev = bo->bdev; + struct ttm_bo_global *glob = bo->glob; + int ret = 0; + uint32_t page_flags = 0; + + TTM_ASSERT_LOCKED(&bo->mutex); + bo->ttm = NULL; + + if (bdev->need_dma32) + page_flags |= TTM_PAGE_FLAG_DMA32; + + switch (bo->type) { + case ttm_bo_type_device: + if (zero_alloc) + page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC; + case ttm_bo_type_kernel: + bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT, + page_flags, glob->dummy_read_page); + if (unlikely(bo->ttm == NULL)) + ret = -ENOMEM; + break; + case ttm_bo_type_sg: + bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT, + page_flags | TTM_PAGE_FLAG_SG, + glob->dummy_read_page); + if (unlikely(bo->ttm == NULL)) { + ret = -ENOMEM; + break; + } + bo->ttm->sg = bo->sg; + break; + default: + pr_err("Illegal buffer object type\n"); + ret = -EINVAL; + break; + } + + 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_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)) { + ret = ttm_mem_io_lock(old_man, true); + if (unlikely(ret != 0)) + goto out_err; + ttm_bo_unmap_virtual_locked(bo); + ttm_mem_io_unlock(old_man); + } + + /* + * Create and bind a ttm if required. + */ + + if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) { + if (bo->ttm == NULL) { + bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED); + ret = ttm_bo_add_ttm(bo, zero); + 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) { + if (bdev->driver->move_notify) + bdev->driver->move_notify(bo, mem); + 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_gpu, mem); + else if (bdev->driver->move) + ret = bdev->driver->move(bo, evict, interruptible, + no_wait_gpu, mem); + else + ret = ttm_bo_move_memcpy(bo, evict, no_wait_gpu, mem); + + if (ret) { + if (bdev->driver->move_notify) { + struct ttm_mem_reg tmp_mem = *mem; + *mem = bo->mem; + bo->mem = tmp_mem; + bdev->driver->move_notify(bo, mem); + bo->mem = *mem; + *mem = tmp_mem; + } + + goto out_err; + } + +moved: + if (bo->evicted) { + ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement); + if (ret) + pr_err("Can not flush read caches\n"); + bo->evicted = false; + } + + if (bo->mem.mm_node) { + bo->offset = (bo->mem.start << PAGE_SHIFT) + + bdev->man[bo->mem.mem_type].gpu_offset; + bo->cur_placement = bo->mem.placement; + } 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; +} + +/** + * Call bo::reserved. + * Will release GPU memory type usage on destruction. + * This is the place to put in driver specific hooks to release + * driver private resources. + * Will release the bo::reserved lock. + */ + +static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo) +{ + if (bo->bdev->driver->move_notify) + bo->bdev->driver->move_notify(bo, NULL); + + if (bo->ttm) { + ttm_tt_unbind(bo->ttm); + ttm_tt_destroy(bo->ttm); + bo->ttm = NULL; + } + ttm_bo_mem_put(bo, &bo->mem); + + atomic_set(&bo->reserved, 0); + wake_up_all(&bo->event_queue); + + /* + * Since the final reference to this bo may not be dropped by + * the current task we have to put a memory barrier here to make + * sure the changes done in this function are always visible. + * + * This function only needs protection against the final kref_put. + */ + smp_mb__before_atomic_dec(); +} + +static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo) +{ + struct ttm_bo_device *bdev = bo->bdev; + struct ttm_bo_global *glob = bo->glob; + struct ttm_bo_driver *driver = bdev->driver; + void *sync_obj = NULL; + int put_count; + int ret; + + spin_lock(&glob->lru_lock); + ret = ttm_bo_reserve_nolru(bo, false, true, false, 0); + + spin_lock(&bdev->fence_lock); + (void) ttm_bo_wait(bo, false, false, true); + if (!ret && !bo->sync_obj) { + spin_unlock(&bdev->fence_lock); + put_count = ttm_bo_del_from_lru(bo); + + spin_unlock(&glob->lru_lock); + ttm_bo_cleanup_memtype_use(bo); + + ttm_bo_list_ref_sub(bo, put_count, true); + + return; + } + if (bo->sync_obj) + sync_obj = driver->sync_obj_ref(bo->sync_obj); + spin_unlock(&bdev->fence_lock); + + if (!ret) { + atomic_set(&bo->reserved, 0); + wake_up_all(&bo->event_queue); + } + + kref_get(&bo->list_kref); + list_add_tail(&bo->ddestroy, &bdev->ddestroy); + spin_unlock(&glob->lru_lock); + + if (sync_obj) { + driver->sync_obj_flush(sync_obj); + driver->sync_obj_unref(&sync_obj); + } + schedule_delayed_work(&bdev->wq, + ((HZ / 100) < 1) ? 1 : HZ / 100); +} + +/** + * function ttm_bo_cleanup_refs_and_unlock + * If bo idle, remove from delayed- and lru lists, and unref. + * If not idle, do nothing. + * + * Must be called with lru_lock and reservation held, this function + * will drop both before returning. + * + * @interruptible Any sleeps should occur interruptibly. + * @no_wait_gpu Never wait for gpu. Return -EBUSY instead. + */ + +static int ttm_bo_cleanup_refs_and_unlock(struct ttm_buffer_object *bo, + bool interruptible, + bool no_wait_gpu) +{ + struct ttm_bo_device *bdev = bo->bdev; + struct ttm_bo_driver *driver = bdev->driver; + struct ttm_bo_global *glob = bo->glob; + int put_count; + int ret; + + spin_lock(&bdev->fence_lock); + ret = ttm_bo_wait(bo, false, false, true); + + if (ret && !no_wait_gpu) { + void *sync_obj; + + /* + * Take a reference to the fence and unreserve, + * at this point the buffer should be dead, so + * no new sync objects can be attached. + */ + sync_obj = driver->sync_obj_ref(bo->sync_obj); + spin_unlock(&bdev->fence_lock); + + atomic_set(&bo->reserved, 0); + wake_up_all(&bo->event_queue); + spin_unlock(&glob->lru_lock); + + ret = driver->sync_obj_wait(sync_obj, false, interruptible); + driver->sync_obj_unref(&sync_obj); + if (ret) + return ret; + + /* + * remove sync_obj with ttm_bo_wait, the wait should be + * finished, and no new wait object should have been added. + */ + spin_lock(&bdev->fence_lock); + ret = ttm_bo_wait(bo, false, false, true); + WARN_ON(ret); + spin_unlock(&bdev->fence_lock); + if (ret) + return ret; + + spin_lock(&glob->lru_lock); + ret = ttm_bo_reserve_nolru(bo, false, true, false, 0); + + /* + * We raced, and lost, someone else holds the reservation now, + * and is probably busy in ttm_bo_cleanup_memtype_use. + * + * Even if it's not the case, because we finished waiting any + * delayed destruction would succeed, so just return success + * here. + */ + if (ret) { + spin_unlock(&glob->lru_lock); + return 0; + } + } else + spin_unlock(&bdev->fence_lock); + + if (ret || unlikely(list_empty(&bo->ddestroy))) { + atomic_set(&bo->reserved, 0); + wake_up_all(&bo->event_queue); + spin_unlock(&glob->lru_lock); + return ret; + } + + put_count = ttm_bo_del_from_lru(bo); + list_del_init(&bo->ddestroy); + ++put_count; + + spin_unlock(&glob->lru_lock); + ttm_bo_cleanup_memtype_use(bo); + + ttm_bo_list_ref_sub(bo, put_count, true); + + return 0; +} + +/** + * Traverse the delayed list, and call ttm_bo_cleanup_refs on all + * encountered buffers. + */ + +static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all) +{ + struct ttm_bo_global *glob = bdev->glob; + struct ttm_buffer_object *entry = NULL; + int ret = 0; + + spin_lock(&glob->lru_lock); + if (list_empty(&bdev->ddestroy)) + goto out_unlock; + + entry = list_first_entry(&bdev->ddestroy, + struct ttm_buffer_object, ddestroy); + kref_get(&entry->list_kref); + + for (;;) { + struct ttm_buffer_object *nentry = NULL; + + if (entry->ddestroy.next != &bdev->ddestroy) { + nentry = list_first_entry(&entry->ddestroy, + struct ttm_buffer_object, ddestroy); + kref_get(&nentry->list_kref); + } + + ret = ttm_bo_reserve_nolru(entry, false, true, false, 0); + if (remove_all && ret) { + spin_unlock(&glob->lru_lock); + ret = ttm_bo_reserve_nolru(entry, false, false, + false, 0); + spin_lock(&glob->lru_lock); + } + + if (!ret) + ret = ttm_bo_cleanup_refs_and_unlock(entry, false, + !remove_all); + else + spin_unlock(&glob->lru_lock); + + kref_put(&entry->list_kref, ttm_bo_release_list); + entry = nentry; + + if (ret || !entry) + goto out; + + spin_lock(&glob->lru_lock); + if (list_empty(&entry->ddestroy)) + break; + } + +out_unlock: + spin_unlock(&glob->lru_lock); +out: + if (entry) + kref_put(&entry->list_kref, ttm_bo_release_list); + return ret; +} + +static void ttm_bo_delayed_workqueue(struct work_struct *work) +{ + struct ttm_bo_device *bdev = + container_of(work, struct ttm_bo_device, wq.work); + + if (ttm_bo_delayed_delete(bdev, false)) { + schedule_delayed_work(&bdev->wq, + ((HZ / 100) < 1) ? 1 : HZ / 100); + } +} + +static void ttm_bo_release(struct kref *kref) +{ + struct ttm_buffer_object *bo = + container_of(kref, struct ttm_buffer_object, kref); + struct ttm_bo_device *bdev = bo->bdev; + struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type]; + + write_lock(&bdev->vm_lock); + if (likely(bo->vm_node != NULL)) { + rb_erase(&bo->vm_rb, &bdev->addr_space_rb); + drm_mm_put_block(bo->vm_node); + bo->vm_node = NULL; + } + write_unlock(&bdev->vm_lock); + ttm_mem_io_lock(man, false); + ttm_mem_io_free_vm(bo); + ttm_mem_io_unlock(man); + ttm_bo_cleanup_refs_or_queue(bo); + kref_put(&bo->list_kref, ttm_bo_release_list); +} + +void ttm_bo_unref(struct ttm_buffer_object **p_bo) +{ + struct ttm_buffer_object *bo = *p_bo; + + *p_bo = NULL; + kref_put(&bo->kref, ttm_bo_release); +} +EXPORT_SYMBOL(ttm_bo_unref); + +int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev) +{ + return cancel_delayed_work_sync(&bdev->wq); +} +EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue); + +void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched) +{ + if (resched) + schedule_delayed_work(&bdev->wq, + ((HZ / 100) < 1) ? 1 : HZ / 100); +} +EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue); + +static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible, + bool no_wait_gpu) +{ + struct ttm_bo_device *bdev = bo->bdev; + struct ttm_mem_reg evict_mem; + struct ttm_placement placement; + int ret = 0; + + spin_lock(&bdev->fence_lock); + ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu); + spin_unlock(&bdev->fence_lock); + + if (unlikely(ret != 0)) { + if (ret != -ERESTARTSYS) { + pr_err("Failed to expire sync object before buffer eviction\n"); + } + goto out; + } + + BUG_ON(!ttm_bo_is_reserved(bo)); + + evict_mem = bo->mem; + evict_mem.mm_node = NULL; + evict_mem.bus.io_reserved_vm = false; + evict_mem.bus.io_reserved_count = 0; + + placement.fpfn = 0; + placement.lpfn = 0; + placement.num_placement = 0; + placement.num_busy_placement = 0; + bdev->driver->evict_flags(bo, &placement); + ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible, + no_wait_gpu); + if (ret) { + if (ret != -ERESTARTSYS) { + pr_err("Failed to find memory space for buffer 0x%p eviction\n", + bo); + ttm_bo_mem_space_debug(bo, &placement); + } + goto out; + } + + ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible, + no_wait_gpu); + if (ret) { + if (ret != -ERESTARTSYS) + pr_err("Buffer eviction failed\n"); + ttm_bo_mem_put(bo, &evict_mem); + goto out; + } + bo->evicted = true; +out: + return ret; +} + +static int ttm_mem_evict_first(struct ttm_bo_device *bdev, + uint32_t mem_type, + bool interruptible, + bool no_wait_gpu) +{ + struct ttm_bo_global *glob = bdev->glob; + struct ttm_mem_type_manager *man = &bdev->man[mem_type]; + struct ttm_buffer_object *bo; + int ret = -EBUSY, put_count; + + spin_lock(&glob->lru_lock); + list_for_each_entry(bo, &man->lru, lru) { + ret = ttm_bo_reserve_nolru(bo, false, true, false, 0); + if (!ret) + break; + } + + if (ret) { + spin_unlock(&glob->lru_lock); + return ret; + } + + kref_get(&bo->list_kref); + + if (!list_empty(&bo->ddestroy)) { + ret = ttm_bo_cleanup_refs_and_unlock(bo, interruptible, + no_wait_gpu); + kref_put(&bo->list_kref, ttm_bo_release_list); + return ret; + } + + put_count = ttm_bo_del_from_lru(bo); + spin_unlock(&glob->lru_lock); + + BUG_ON(ret != 0); + + ttm_bo_list_ref_sub(bo, put_count, true); + + ret = ttm_bo_evict(bo, interruptible, no_wait_gpu); + ttm_bo_unreserve(bo); + + kref_put(&bo->list_kref, ttm_bo_release_list); + return ret; +} + +void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem) +{ + struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type]; + + if (mem->mm_node) + (*man->func->put_node)(man, mem); +} +EXPORT_SYMBOL(ttm_bo_mem_put); + +/** + * Repeatedly evict memory from the LRU for @mem_type until we create enough + * space, or we've evicted everything and there isn't enough space. + */ +static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo, + uint32_t mem_type, + struct ttm_placement *placement, + struct ttm_mem_reg *mem, + bool interruptible, + bool no_wait_gpu) +{ + struct ttm_bo_device *bdev = bo->bdev; + struct ttm_mem_type_manager *man = &bdev->man[mem_type]; + int ret; + + do { + ret = (*man->func->get_node)(man, bo, placement, mem); + if (unlikely(ret != 0)) + return ret; + if (mem->mm_node) + break; + ret = ttm_mem_evict_first(bdev, mem_type, + interruptible, no_wait_gpu); + if (unlikely(ret != 0)) + return ret; + } while (1); + if (mem->mm_node == NULL) + return -ENOMEM; + mem->mem_type = mem_type; + return 0; +} + +static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man, + uint32_t cur_placement, + uint32_t proposed_placement) +{ + uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING; + uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING; + + /** + * Keep current caching if possible. + */ + + if ((cur_placement & caching) != 0) + result |= (cur_placement & caching); + else if ((man->default_caching & caching) != 0) + result |= man->default_caching; + else if ((TTM_PL_FLAG_CACHED & caching) != 0) + result |= TTM_PL_FLAG_CACHED; + else if ((TTM_PL_FLAG_WC & caching) != 0) + result |= TTM_PL_FLAG_WC; + else if ((TTM_PL_FLAG_UNCACHED & caching) != 0) + result |= TTM_PL_FLAG_UNCACHED; + + return result; +} + +static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man, + uint32_t mem_type, + uint32_t proposed_placement, + uint32_t *masked_placement) +{ + uint32_t cur_flags = ttm_bo_type_flags(mem_type); + + if ((cur_flags & proposed_placement & TTM_PL_MASK_MEM) == 0) + return false; + + if ((proposed_placement & man->available_caching) == 0) + return false; + + cur_flags |= (proposed_placement & man->available_caching); + + *masked_placement = cur_flags; + return true; +} + +/** + * Creates space for memory region @mem according to its type. + * + * This function first searches for free space in compatible memory types in + * the priority order defined by the driver. If free space isn't found, then + * ttm_bo_mem_force_space is attempted in priority order to evict and find + * space. + */ +int ttm_bo_mem_space(struct ttm_buffer_object *bo, + struct ttm_placement *placement, + struct ttm_mem_reg *mem, + bool interruptible, + bool no_wait_gpu) +{ + struct ttm_bo_device *bdev = bo->bdev; + struct ttm_mem_type_manager *man; + uint32_t mem_type = TTM_PL_SYSTEM; + uint32_t cur_flags = 0; + bool type_found = false; + bool type_ok = false; + bool has_erestartsys = false; + int i, ret; + + mem->mm_node = NULL; + for (i = 0; i < placement->num_placement; ++i) { + ret = ttm_mem_type_from_flags(placement->placement[i], + &mem_type); + if (ret) + return ret; + man = &bdev->man[mem_type]; + + type_ok = ttm_bo_mt_compatible(man, + mem_type, + placement->placement[i], + &cur_flags); + + if (!type_ok) + continue; + + cur_flags = ttm_bo_select_caching(man, bo->mem.placement, + cur_flags); + /* + * Use the access and other non-mapping-related flag bits from + * the memory placement flags to the current flags + */ + ttm_flag_masked(&cur_flags, placement->placement[i], + ~TTM_PL_MASK_MEMTYPE); + + if (mem_type == TTM_PL_SYSTEM) + break; + + if (man->has_type && man->use_type) { + type_found = true; + ret = (*man->func->get_node)(man, bo, placement, mem); + if (unlikely(ret)) + return ret; + } + if (mem->mm_node) + break; + } + + if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) { + mem->mem_type = mem_type; + mem->placement = cur_flags; + return 0; + } + + if (!type_found) + return -EINVAL; + + for (i = 0; i < placement->num_busy_placement; ++i) { + ret = ttm_mem_type_from_flags(placement->busy_placement[i], + &mem_type); + if (ret) + return ret; + man = &bdev->man[mem_type]; + if (!man->has_type) + continue; + if (!ttm_bo_mt_compatible(man, + mem_type, + placement->busy_placement[i], + &cur_flags)) + continue; + + cur_flags = ttm_bo_select_caching(man, bo->mem.placement, + cur_flags); + /* + * Use the access and other non-mapping-related flag bits from + * the memory placement flags to the current flags + */ + ttm_flag_masked(&cur_flags, placement->busy_placement[i], + ~TTM_PL_MASK_MEMTYPE); + + + if (mem_type == TTM_PL_SYSTEM) { + mem->mem_type = mem_type; + mem->placement = cur_flags; + mem->mm_node = NULL; + return 0; + } + + ret = ttm_bo_mem_force_space(bo, mem_type, placement, mem, + interruptible, no_wait_gpu); + if (ret == 0 && mem->mm_node) { + mem->placement = cur_flags; + return 0; + } + if (ret == -ERESTARTSYS) + has_erestartsys = true; + } + ret = (has_erestartsys) ? -ERESTARTSYS : -ENOMEM; + return ret; +} +EXPORT_SYMBOL(ttm_bo_mem_space); + +int ttm_bo_move_buffer(struct ttm_buffer_object *bo, + struct ttm_placement *placement, + bool interruptible, + bool no_wait_gpu) +{ + int ret = 0; + struct ttm_mem_reg mem; + struct ttm_bo_device *bdev = bo->bdev; + + BUG_ON(!ttm_bo_is_reserved(bo)); + + /* + * FIXME: It's possible to pipeline buffer moves. + * Have the driver move function wait for idle when necessary, + * instead of doing it here. + */ + spin_lock(&bdev->fence_lock); + ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu); + spin_unlock(&bdev->fence_lock); + if (ret) + return ret; + mem.num_pages = bo->num_pages; + mem.size = mem.num_pages << PAGE_SHIFT; + mem.page_alignment = bo->mem.page_alignment; + mem.bus.io_reserved_vm = false; + mem.bus.io_reserved_count = 0; + /* + * Determine where to move the buffer. + */ + ret = ttm_bo_mem_space(bo, placement, &mem, + interruptible, no_wait_gpu); + if (ret) + goto out_unlock; + ret = ttm_bo_handle_move_mem(bo, &mem, false, + interruptible, no_wait_gpu); +out_unlock: + if (ret && mem.mm_node) + ttm_bo_mem_put(bo, &mem); + return ret; +} + +static int ttm_bo_mem_compat(struct ttm_placement *placement, + struct ttm_mem_reg *mem) +{ + int i; + + if (mem->mm_node && placement->lpfn != 0 && + (mem->start < placement->fpfn || + mem->start + mem->num_pages > placement->lpfn)) + return -1; + + for (i = 0; i < placement->num_placement; i++) { + if ((placement->placement[i] & mem->placement & + TTM_PL_MASK_CACHING) && + (placement->placement[i] & mem->placement & + TTM_PL_MASK_MEM)) + return i; + } + return -1; +} + +int ttm_bo_validate(struct ttm_buffer_object *bo, + struct ttm_placement *placement, + bool interruptible, + bool no_wait_gpu) +{ + int ret; + + BUG_ON(!ttm_bo_is_reserved(bo)); + /* Check that range is valid */ + if (placement->lpfn || placement->fpfn) + if (placement->fpfn > placement->lpfn || + (placement->lpfn - placement->fpfn) < bo->num_pages) + return -EINVAL; + /* + * Check whether we need to move buffer. + */ + ret = ttm_bo_mem_compat(placement, &bo->mem); + if (ret < 0) { + ret = ttm_bo_move_buffer(bo, placement, interruptible, + no_wait_gpu); + if (ret) + return ret; + } else { + /* + * Use the access and other non-mapping-related flag bits from + * the compatible memory placement flags to the active flags + */ + ttm_flag_masked(&bo->mem.placement, placement->placement[ret], + ~TTM_PL_MASK_MEMTYPE); + } + /* + * We might need to add a TTM. + */ + if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) { + ret = ttm_bo_add_ttm(bo, true); + if (ret) + return ret; + } + return 0; +} +EXPORT_SYMBOL(ttm_bo_validate); + +int ttm_bo_check_placement(struct ttm_buffer_object *bo, + struct ttm_placement *placement) +{ + BUG_ON((placement->fpfn || placement->lpfn) && + (bo->mem.num_pages > (placement->lpfn - placement->fpfn))); + + return 0; +} + +int ttm_bo_init(struct ttm_bo_device *bdev, + struct ttm_buffer_object *bo, + unsigned long size, + enum ttm_bo_type type, + struct ttm_placement *placement, + uint32_t page_alignment, + bool interruptible, + struct file *persistent_swap_storage, + size_t acc_size, + struct sg_table *sg, + void (*destroy) (struct ttm_buffer_object *)) +{ + int ret = 0; + unsigned long num_pages; + struct ttm_mem_global *mem_glob = bdev->glob->mem_glob; + + ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false); + if (ret) { + pr_err("Out of kernel memory\n"); + if (destroy) + (*destroy)(bo); + else + kfree(bo); + return -ENOMEM; + } + + num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; + if (num_pages == 0) { + pr_err("Illegal buffer object size\n"); + if (destroy) + (*destroy)(bo); + else + kfree(bo); + ttm_mem_global_free(mem_glob, acc_size); + return -EINVAL; + } + bo->destroy = destroy; + + kref_init(&bo->kref); + kref_init(&bo->list_kref); + atomic_set(&bo->cpu_writers, 0); + atomic_set(&bo->reserved, 1); + init_waitqueue_head(&bo->event_queue); + INIT_LIST_HEAD(&bo->lru); + INIT_LIST_HEAD(&bo->ddestroy); + INIT_LIST_HEAD(&bo->swap); + INIT_LIST_HEAD(&bo->io_reserve_lru); + bo->bdev = bdev; + bo->glob = bdev->glob; + bo->type = type; + bo->num_pages = num_pages; + bo->mem.size = num_pages << PAGE_SHIFT; + bo->mem.mem_type = TTM_PL_SYSTEM; + bo->mem.num_pages = bo->num_pages; + bo->mem.mm_node = NULL; + bo->mem.page_alignment = page_alignment; + bo->mem.bus.io_reserved_vm = false; + bo->mem.bus.io_reserved_count = 0; + bo->priv_flags = 0; + bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED); + bo->seq_valid = false; + bo->persistent_swap_storage = persistent_swap_storage; + bo->acc_size = acc_size; + bo->sg = sg; + atomic_inc(&bo->glob->bo_count); + + ret = ttm_bo_check_placement(bo, placement); + if (unlikely(ret != 0)) + goto out_err; + + /* + * For ttm_bo_type_device buffers, allocate + * address space from the device. + */ + if (bo->type == ttm_bo_type_device || + bo->type == ttm_bo_type_sg) { + ret = ttm_bo_setup_vm(bo); + if (ret) + goto out_err; + } + + ret = ttm_bo_validate(bo, placement, interruptible, false); + if (ret) + goto out_err; + + ttm_bo_unreserve(bo); + return 0; + +out_err: + ttm_bo_unreserve(bo); + ttm_bo_unref(&bo); + + return ret; +} +EXPORT_SYMBOL(ttm_bo_init); + +size_t ttm_bo_acc_size(struct ttm_bo_device *bdev, + unsigned long bo_size, + unsigned struct_size) +{ + unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT; + size_t size = 0; + + size += ttm_round_pot(struct_size); + size += PAGE_ALIGN(npages * sizeof(void *)); + size += ttm_round_pot(sizeof(struct ttm_tt)); + return size; +} +EXPORT_SYMBOL(ttm_bo_acc_size); + +size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev, + unsigned long bo_size, + unsigned struct_size) +{ + unsigned npages = (PAGE_ALIGN(bo_size)) >> PAGE_SHIFT; + size_t size = 0; + + size += ttm_round_pot(struct_size); + size += PAGE_ALIGN(npages * sizeof(void *)); + size += PAGE_ALIGN(npages * sizeof(dma_addr_t)); + size += ttm_round_pot(sizeof(struct ttm_dma_tt)); + return size; +} +EXPORT_SYMBOL(ttm_bo_dma_acc_size); + +int ttm_bo_create(struct ttm_bo_device *bdev, + unsigned long size, + enum ttm_bo_type type, + struct ttm_placement *placement, + uint32_t page_alignment, + bool interruptible, + struct file *persistent_swap_storage, + struct ttm_buffer_object **p_bo) +{ + struct ttm_buffer_object *bo; + size_t acc_size; + int ret; + + bo = kzalloc(sizeof(*bo), GFP_KERNEL); + if (unlikely(bo == NULL)) + return -ENOMEM; + + acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object)); + ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment, + interruptible, persistent_swap_storage, acc_size, + NULL, NULL); + if (likely(ret == 0)) + *p_bo = bo; + + return ret; +} +EXPORT_SYMBOL(ttm_bo_create); + +static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev, + unsigned mem_type, bool allow_errors) +{ + struct ttm_mem_type_manager *man = &bdev->man[mem_type]; + struct ttm_bo_global *glob = bdev->glob; + int ret; + + /* + * Can't use standard list traversal since we're unlocking. + */ + + spin_lock(&glob->lru_lock); + while (!list_empty(&man->lru)) { + spin_unlock(&glob->lru_lock); + ret = ttm_mem_evict_first(bdev, mem_type, false, false); + if (ret) { + if (allow_errors) { + return ret; + } else { + pr_err("Cleanup eviction failed\n"); + } + } + spin_lock(&glob->lru_lock); + } + spin_unlock(&glob->lru_lock); + return 0; +} + +int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type) +{ + struct ttm_mem_type_manager *man; + int ret = -EINVAL; + + if (mem_type >= TTM_NUM_MEM_TYPES) { + pr_err("Illegal memory type %d\n", mem_type); + return ret; + } + man = &bdev->man[mem_type]; + + if (!man->has_type) { + pr_err("Trying to take down uninitialized memory manager type %u\n", + mem_type); + return ret; + } + + man->use_type = false; + man->has_type = false; + + ret = 0; + if (mem_type > 0) { + ttm_bo_force_list_clean(bdev, mem_type, false); + + ret = (*man->func->takedown)(man); + } + + return ret; +} +EXPORT_SYMBOL(ttm_bo_clean_mm); + +int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type) +{ + struct ttm_mem_type_manager *man = &bdev->man[mem_type]; + + if (mem_type == 0 || mem_type >= TTM_NUM_MEM_TYPES) { + pr_err("Illegal memory manager memory type %u\n", mem_type); + return -EINVAL; + } + + if (!man->has_type) { + pr_err("Memory type %u has not been initialized\n", mem_type); + return 0; + } + + return ttm_bo_force_list_clean(bdev, mem_type, true); +} +EXPORT_SYMBOL(ttm_bo_evict_mm); + +int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type, + unsigned long p_size) +{ + int ret = -EINVAL; + struct ttm_mem_type_manager *man; + + BUG_ON(type >= TTM_NUM_MEM_TYPES); + man = &bdev->man[type]; + BUG_ON(man->has_type); + man->io_reserve_fastpath = true; + man->use_io_reserve_lru = false; + mutex_init(&man->io_reserve_mutex); + INIT_LIST_HEAD(&man->io_reserve_lru); + + ret = bdev->driver->init_mem_type(bdev, type, man); + if (ret) + return ret; + man->bdev = bdev; + + ret = 0; + if (type != TTM_PL_SYSTEM) { + ret = (*man->func->init)(man, p_size); + if (ret) + return ret; + } + man->has_type = true; + man->use_type = true; + man->size = p_size; + + INIT_LIST_HEAD(&man->lru); + + return 0; +} +EXPORT_SYMBOL(ttm_bo_init_mm); + +static void ttm_bo_global_kobj_release(struct kobject *kobj) +{ + struct ttm_bo_global *glob = + container_of(kobj, struct ttm_bo_global, kobj); + + ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink); + __free_page(glob->dummy_read_page); + kfree(glob); +} + +void ttm_bo_global_release(struct drm_global_reference *ref) +{ + struct ttm_bo_global *glob = ref->object; + + kobject_del(&glob->kobj); + kobject_put(&glob->kobj); +} +EXPORT_SYMBOL(ttm_bo_global_release); + +int ttm_bo_global_init(struct drm_global_reference *ref) +{ + struct ttm_bo_global_ref *bo_ref = + container_of(ref, struct ttm_bo_global_ref, ref); + struct ttm_bo_global *glob = ref->object; + int ret; + + mutex_init(&glob->device_list_mutex); + spin_lock_init(&glob->lru_lock); + glob->mem_glob = bo_ref->mem_glob; + glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32); + + if (unlikely(glob->dummy_read_page == NULL)) { + ret = -ENOMEM; + goto out_no_drp; + } + + INIT_LIST_HEAD(&glob->swap_lru); + INIT_LIST_HEAD(&glob->device_list); + + ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout); + ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink); + if (unlikely(ret != 0)) { + pr_err("Could not register buffer object swapout\n"); + goto out_no_shrink; + } + + atomic_set(&glob->bo_count, 0); + + ret = kobject_init_and_add( + &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects"); + if (unlikely(ret != 0)) + kobject_put(&glob->kobj); + return ret; +out_no_shrink: + __free_page(glob->dummy_read_page); +out_no_drp: + kfree(glob); + return ret; +} +EXPORT_SYMBOL(ttm_bo_global_init); + + +int ttm_bo_device_release(struct ttm_bo_device *bdev) +{ + int ret = 0; + unsigned i = TTM_NUM_MEM_TYPES; + struct ttm_mem_type_manager *man; + struct ttm_bo_global *glob = bdev->glob; + + while (i--) { + man = &bdev->man[i]; + if (man->has_type) { + man->use_type = false; + if ((i != TTM_PL_SYSTEM) && ttm_bo_clean_mm(bdev, i)) { + ret = -EBUSY; + pr_err("DRM memory manager type %d is not clean\n", + i); + } + man->has_type = false; + } + } + + mutex_lock(&glob->device_list_mutex); + list_del(&bdev->device_list); + mutex_unlock(&glob->device_list_mutex); + + cancel_delayed_work_sync(&bdev->wq); + + while (ttm_bo_delayed_delete(bdev, true)) + ; + + spin_lock(&glob->lru_lock); + if (list_empty(&bdev->ddestroy)) + TTM_DEBUG("Delayed destroy list was clean\n"); + + if (list_empty(&bdev->man[0].lru)) + TTM_DEBUG("Swap list was clean\n"); + spin_unlock(&glob->lru_lock); + + BUG_ON(!drm_mm_clean(&bdev->addr_space_mm)); + write_lock(&bdev->vm_lock); + drm_mm_takedown(&bdev->addr_space_mm); + write_unlock(&bdev->vm_lock); + + return ret; +} +EXPORT_SYMBOL(ttm_bo_device_release); + +int ttm_bo_device_init(struct ttm_bo_device *bdev, + struct ttm_bo_global *glob, + struct ttm_bo_driver *driver, + uint64_t file_page_offset, + bool need_dma32) +{ + int ret = -EINVAL; + + rwlock_init(&bdev->vm_lock); + bdev->driver = driver; + + memset(bdev->man, 0, sizeof(bdev->man)); + + /* + * Initialize the system memory buffer type. + * Other types need to be driver / IOCTL initialized. + */ + ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0); + if (unlikely(ret != 0)) + goto out_no_sys; + + bdev->addr_space_rb = RB_ROOT; + ret = drm_mm_init(&bdev->addr_space_mm, file_page_offset, 0x10000000); + if (unlikely(ret != 0)) + goto out_no_addr_mm; + + INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue); + INIT_LIST_HEAD(&bdev->ddestroy); + bdev->dev_mapping = NULL; + bdev->glob = glob; + bdev->need_dma32 = need_dma32; + bdev->val_seq = 0; + spin_lock_init(&bdev->fence_lock); + mutex_lock(&glob->device_list_mutex); + list_add_tail(&bdev->device_list, &glob->device_list); + mutex_unlock(&glob->device_list_mutex); + + return 0; +out_no_addr_mm: + ttm_bo_clean_mm(bdev, 0); +out_no_sys: + return ret; +} +EXPORT_SYMBOL(ttm_bo_device_init); + +/* + * buffer object vm functions. + */ + +bool ttm_mem_reg_is_pci(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem) +{ + struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type]; + + if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED)) { + if (mem->mem_type == TTM_PL_SYSTEM) + return false; + + if (man->flags & TTM_MEMTYPE_FLAG_CMA) + return false; + + if (mem->placement & TTM_PL_FLAG_CACHED) + return false; + } + return true; +} + +void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo) +{ + struct ttm_bo_device *bdev = bo->bdev; + loff_t offset = (loff_t) bo->addr_space_offset; + loff_t holelen = ((loff_t) bo->mem.num_pages) << PAGE_SHIFT; + + if (!bdev->dev_mapping) + return; + unmap_mapping_range(bdev->dev_mapping, offset, holelen, 1); + ttm_mem_io_free_vm(bo); +} + +void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo) +{ + struct ttm_bo_device *bdev = bo->bdev; + struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type]; + + ttm_mem_io_lock(man, false); + ttm_bo_unmap_virtual_locked(bo); + ttm_mem_io_unlock(man); +} + + +EXPORT_SYMBOL(ttm_bo_unmap_virtual); + +static void ttm_bo_vm_insert_rb(struct ttm_buffer_object *bo) +{ + struct ttm_bo_device *bdev = bo->bdev; + struct rb_node **cur = &bdev->addr_space_rb.rb_node; + struct rb_node *parent = NULL; + struct ttm_buffer_object *cur_bo; + unsigned long offset = bo->vm_node->start; + unsigned long cur_offset; + + while (*cur) { + parent = *cur; + cur_bo = rb_entry(parent, struct ttm_buffer_object, vm_rb); + cur_offset = cur_bo->vm_node->start; + if (offset < cur_offset) + cur = &parent->rb_left; + else if (offset > cur_offset) + cur = &parent->rb_right; + else + BUG(); + } + + rb_link_node(&bo->vm_rb, parent, cur); + rb_insert_color(&bo->vm_rb, &bdev->addr_space_rb); +} + +/** + * ttm_bo_setup_vm: + * + * @bo: the buffer to allocate address space for + * + * Allocate address space in the drm device so that applications + * can mmap the buffer and access the contents. This only + * applies to ttm_bo_type_device objects as others are not + * placed in the drm device address space. + */ + +static int ttm_bo_setup_vm(struct ttm_buffer_object *bo) +{ + struct ttm_bo_device *bdev = bo->bdev; + int ret; + +retry_pre_get: + ret = drm_mm_pre_get(&bdev->addr_space_mm); + if (unlikely(ret != 0)) + return ret; + + write_lock(&bdev->vm_lock); + bo->vm_node = drm_mm_search_free(&bdev->addr_space_mm, + bo->mem.num_pages, 0, 0); + + if (unlikely(bo->vm_node == NULL)) { + ret = -ENOMEM; + goto out_unlock; + } + + bo->vm_node = drm_mm_get_block_atomic(bo->vm_node, + bo->mem.num_pages, 0); + + if (unlikely(bo->vm_node == NULL)) { + write_unlock(&bdev->vm_lock); + goto retry_pre_get; + } + + ttm_bo_vm_insert_rb(bo); + write_unlock(&bdev->vm_lock); + bo->addr_space_offset = ((uint64_t) bo->vm_node->start) << PAGE_SHIFT; + + return 0; +out_unlock: + write_unlock(&bdev->vm_lock); + return ret; +} + +int ttm_bo_wait(struct ttm_buffer_object *bo, + bool lazy, bool interruptible, bool no_wait) +{ + struct ttm_bo_driver *driver = bo->bdev->driver; + struct ttm_bo_device *bdev = bo->bdev; + void *sync_obj; + int ret = 0; + + if (likely(bo->sync_obj == NULL)) + return 0; + + while (bo->sync_obj) { + + if (driver->sync_obj_signaled(bo->sync_obj)) { + void *tmp_obj = bo->sync_obj; + bo->sync_obj = NULL; + clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags); + spin_unlock(&bdev->fence_lock); + driver->sync_obj_unref(&tmp_obj); + spin_lock(&bdev->fence_lock); + continue; + } + + if (no_wait) + return -EBUSY; + + sync_obj = driver->sync_obj_ref(bo->sync_obj); + spin_unlock(&bdev->fence_lock); + ret = driver->sync_obj_wait(sync_obj, + lazy, interruptible); + if (unlikely(ret != 0)) { + driver->sync_obj_unref(&sync_obj); + spin_lock(&bdev->fence_lock); + return ret; + } + spin_lock(&bdev->fence_lock); + if (likely(bo->sync_obj == sync_obj)) { + void *tmp_obj = bo->sync_obj; + bo->sync_obj = NULL; + clear_bit(TTM_BO_PRIV_FLAG_MOVING, + &bo->priv_flags); + spin_unlock(&bdev->fence_lock); + driver->sync_obj_unref(&sync_obj); + driver->sync_obj_unref(&tmp_obj); + spin_lock(&bdev->fence_lock); + } else { + spin_unlock(&bdev->fence_lock); + driver->sync_obj_unref(&sync_obj); + spin_lock(&bdev->fence_lock); + } + } + return 0; +} +EXPORT_SYMBOL(ttm_bo_wait); + +int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait) +{ + struct ttm_bo_device *bdev = bo->bdev; + int ret = 0; + + /* + * Using ttm_bo_reserve makes sure the lru lists are updated. + */ + + ret = ttm_bo_reserve(bo, true, no_wait, false, 0); + if (unlikely(ret != 0)) + return ret; + spin_lock(&bdev->fence_lock); + ret = ttm_bo_wait(bo, false, true, no_wait); + spin_unlock(&bdev->fence_lock); + if (likely(ret == 0)) + atomic_inc(&bo->cpu_writers); + ttm_bo_unreserve(bo); + return ret; +} +EXPORT_SYMBOL(ttm_bo_synccpu_write_grab); + +void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo) +{ + atomic_dec(&bo->cpu_writers); +} +EXPORT_SYMBOL(ttm_bo_synccpu_write_release); + +/** + * A buffer object shrink method that tries to swap out the first + * buffer object on the bo_global::swap_lru list. + */ + +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); + list_for_each_entry(bo, &glob->swap_lru, swap) { + ret = ttm_bo_reserve_nolru(bo, false, true, false, 0); + if (!ret) + break; + } + + if (ret) { + spin_unlock(&glob->lru_lock); + return ret; + } + + kref_get(&bo->list_kref); + + if (!list_empty(&bo->ddestroy)) { + ret = ttm_bo_cleanup_refs_and_unlock(bo, false, false); + kref_put(&bo->list_kref, ttm_bo_release_list); + return ret; + } + + 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); + 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; +} + +void ttm_bo_swapout_all(struct ttm_bo_device *bdev) +{ + while (ttm_bo_swapout(&bdev->glob->shrink) == 0) + ; +} +EXPORT_SYMBOL(ttm_bo_swapout_all); |