diff options
Diffstat (limited to 'drivers/gpu/drm/ttm/ttm_bo.c')
| -rw-r--r-- | drivers/gpu/drm/ttm/ttm_bo.c | 1698 |
1 files changed, 1698 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 000000000000..1587aeca7bea --- /dev/null +++ b/drivers/gpu/drm/ttm/ttm_bo.c @@ -0,0 +1,1698 @@ +/************************************************************************** + * + * 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> + */ + +#include "ttm/ttm_module.h" +#include "ttm/ttm_bo_driver.h" +#include "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> + +#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 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo); +static int ttm_bo_swapout(struct ttm_mem_shrink *shrink); + +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; + + 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); + if (bo->destroy) + bo->destroy(bo); + else { + ttm_mem_global_free(bdev->mem_glob, bo->acc_size, false); + kfree(bo); + } +} + +int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo, bool interruptible) +{ + + if (interruptible) { + int ret = 0; + + ret = wait_event_interruptible(bo->event_queue, + atomic_read(&bo->reserved) == 0); + if (unlikely(ret != 0)) + return -ERESTART; + } else { + wait_event(bo->event_queue, atomic_read(&bo->reserved) == 0); + } + return 0; +} + +static 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(!atomic_read(&bo->reserved)); + + 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, &bdev->swap_lru); + kref_get(&bo->list_kref); + } + } +} + +/** + * Call with the lru_lock held. + */ + +static 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_locked(struct ttm_buffer_object *bo, + bool interruptible, + bool no_wait, bool use_sequence, uint32_t sequence) +{ + struct ttm_bo_device *bdev = bo->bdev; + int ret; + + while (unlikely(atomic_cmpxchg(&bo->reserved, 0, 1) != 0)) { + if (use_sequence && bo->seq_valid && + (sequence - bo->val_seq < (1 << 31))) { + return -EAGAIN; + } + + if (no_wait) + return -EBUSY; + + spin_unlock(&bdev->lru_lock); + ret = ttm_bo_wait_unreserved(bo, interruptible); + spin_lock(&bdev->lru_lock); + + if (unlikely(ret)) + return ret; + } + + if (use_sequence) { + bo->val_seq = sequence; + bo->seq_valid = true; + } else { + bo->seq_valid = false; + } + + return 0; +} +EXPORT_SYMBOL(ttm_bo_reserve); + +static void ttm_bo_ref_bug(struct kref *list_kref) +{ + BUG(); +} + +int ttm_bo_reserve(struct ttm_buffer_object *bo, + bool interruptible, + bool no_wait, bool use_sequence, uint32_t sequence) +{ + struct ttm_bo_device *bdev = bo->bdev; + int put_count = 0; + int ret; + + spin_lock(&bdev->lru_lock); + ret = ttm_bo_reserve_locked(bo, interruptible, no_wait, use_sequence, + sequence); + if (likely(ret == 0)) + put_count = ttm_bo_del_from_lru(bo); + spin_unlock(&bdev->lru_lock); + + while (put_count--) + kref_put(&bo->list_kref, ttm_bo_ref_bug); + + return ret; +} + +void ttm_bo_unreserve(struct ttm_buffer_object *bo) +{ + struct ttm_bo_device *bdev = bo->bdev; + + spin_lock(&bdev->lru_lock); + ttm_bo_add_to_lru(bo); + atomic_set(&bo->reserved, 0); + wake_up_all(&bo->event_queue); + spin_unlock(&bdev->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; + int ret = 0; + uint32_t page_flags = 0; + + TTM_ASSERT_LOCKED(&bo->mutex); + bo->ttm = NULL; + + 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 = ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT, + page_flags, bdev->dummy_read_page); + if (unlikely(bo->ttm == NULL)) + ret = -ENOMEM; + break; + case ttm_bo_type_user: + bo->ttm = ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT, + page_flags | TTM_PAGE_FLAG_USER, + bdev->dummy_read_page); + if (unlikely(bo->ttm == NULL)) + ret = -ENOMEM; + break; + + ret = ttm_tt_set_user(bo->ttm, current, + bo->buffer_start, bo->num_pages); + if (unlikely(ret != 0)) + ttm_tt_destroy(bo->ttm); + break; + default: + printk(KERN_ERR TTM_PFX "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) +{ + 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) + return ret; + + 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) { + + struct ttm_mem_reg *old_mem = &bo->mem; + uint32_t save_flags = old_mem->placement; + + *old_mem = *mem; + mem->mm_node = NULL; + ttm_flag_masked(&save_flags, mem->placement, + TTM_PL_MASK_MEMTYPE); + goto moved; + } + + } + + if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) && + !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) + ret = ttm_bo_move_ttm(bo, evict, no_wait, mem); + else if (bdev->driver->move) + ret = bdev->driver->move(bo, evict, interruptible, + no_wait, mem); + else + ret = ttm_bo_move_memcpy(bo, evict, no_wait, 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); + } + + 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; +} + +/** + * If bo idle, remove from delayed- and lru lists, and unref. + * If not idle, and already on delayed list, do nothing. + * If not idle, and not on delayed list, put on delayed list, + * up the list_kref and schedule a delayed list check. + */ + +static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo, bool remove_all) +{ + struct ttm_bo_device *bdev = bo->bdev; + struct ttm_bo_driver *driver = bdev->driver; + int ret; + + spin_lock(&bo->lock); + (void) ttm_bo_wait(bo, false, false, !remove_all); + + if (!bo->sync_obj) { + int put_count; + + spin_unlock(&bo->lock); + + spin_lock(&bdev->lru_lock); + ret = ttm_bo_reserve_locked(bo, false, false, false, 0); + BUG_ON(ret); + if (bo->ttm) + ttm_tt_unbind(bo->ttm); + + if (!list_empty(&bo->ddestroy)) { + list_del_init(&bo->ddestroy); + kref_put(&bo->list_kref, ttm_bo_ref_bug); + } + if (bo->mem.mm_node) { + drm_mm_put_block(bo->mem.mm_node); + bo->mem.mm_node = NULL; + } + put_count = ttm_bo_del_from_lru(bo); + spin_unlock(&bdev->lru_lock); + + atomic_set(&bo->reserved, 0); + + while (put_count--) + kref_put(&bo->list_kref, ttm_bo_release_list); + + return 0; + } + + spin_lock(&bdev->lru_lock); + if (list_empty(&bo->ddestroy)) { + void *sync_obj = bo->sync_obj; + void *sync_obj_arg = bo->sync_obj_arg; + + kref_get(&bo->list_kref); + list_add_tail(&bo->ddestroy, &bdev->ddestroy); + spin_unlock(&bdev->lru_lock); + spin_unlock(&bo->lock); + + if (sync_obj) + driver->sync_obj_flush(sync_obj, sync_obj_arg); + schedule_delayed_work(&bdev->wq, + ((HZ / 100) < 1) ? 1 : HZ / 100); + ret = 0; + + } else { + spin_unlock(&bdev->lru_lock); + spin_unlock(&bo->lock); + ret = -EBUSY; + } + + return ret; +} + +/** + * 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_buffer_object *entry, *nentry; + struct list_head *list, *next; + int ret; + + spin_lock(&bdev->lru_lock); + list_for_each_safe(list, next, &bdev->ddestroy) { + entry = list_entry(list, struct ttm_buffer_object, ddestroy); + nentry = NULL; + + /* + * Protect the next list entry from destruction while we + * unlock the lru_lock. + */ + + if (next != &bdev->ddestroy) { + nentry = list_entry(next, struct ttm_buffer_object, + ddestroy); + kref_get(&nentry->list_kref); + } + kref_get(&entry->list_kref); + + spin_unlock(&bdev->lru_lock); + ret = ttm_bo_cleanup_refs(entry, remove_all); + kref_put(&entry->list_kref, ttm_bo_release_list); + + spin_lock(&bdev->lru_lock); + if (nentry) { + bool next_onlist = !list_empty(next); + spin_unlock(&bdev->lru_lock); + kref_put(&nentry->list_kref, ttm_bo_release_list); + spin_lock(&bdev->lru_lock); + /* + * Someone might have raced us and removed the + * next entry from the list. We don't bother restarting + * list traversal. + */ + + if (!next_onlist) + break; + } + if (ret) + break; + } + ret = !list_empty(&bdev->ddestroy); + spin_unlock(&bdev->lru_lock); + + 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; + + 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_bo_cleanup_refs(bo, false); + kref_put(&bo->list_kref, ttm_bo_release_list); + write_lock(&bdev->vm_lock); +} + +void ttm_bo_unref(struct ttm_buffer_object **p_bo) +{ + struct ttm_buffer_object *bo = *p_bo; + struct ttm_bo_device *bdev = bo->bdev; + + *p_bo = NULL; + write_lock(&bdev->vm_lock); + kref_put(&bo->kref, ttm_bo_release); + write_unlock(&bdev->vm_lock); +} +EXPORT_SYMBOL(ttm_bo_unref); + +static int ttm_bo_evict(struct ttm_buffer_object *bo, unsigned mem_type, + bool interruptible, bool no_wait) +{ + int ret = 0; + struct ttm_bo_device *bdev = bo->bdev; + struct ttm_mem_reg evict_mem; + uint32_t proposed_placement; + + if (bo->mem.mem_type != mem_type) + goto out; + + spin_lock(&bo->lock); + ret = ttm_bo_wait(bo, false, interruptible, no_wait); + spin_unlock(&bo->lock); + + if (ret && ret != -ERESTART) { + printk(KERN_ERR TTM_PFX "Failed to expire sync object before " + "buffer eviction.\n"); + goto out; + } + + BUG_ON(!atomic_read(&bo->reserved)); + + evict_mem = bo->mem; + evict_mem.mm_node = NULL; + + proposed_placement = bdev->driver->evict_flags(bo); + + ret = ttm_bo_mem_space(bo, proposed_placement, + &evict_mem, interruptible, no_wait); + if (unlikely(ret != 0 && ret != -ERESTART)) + ret = ttm_bo_mem_space(bo, TTM_PL_FLAG_SYSTEM, + &evict_mem, interruptible, no_wait); + + if (ret) { + if (ret != -ERESTART) + printk(KERN_ERR TTM_PFX + "Failed to find memory space for " + "buffer 0x%p eviction.\n", bo); + goto out; + } + + ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible, + no_wait); + if (ret) { + if (ret != -ERESTART) + printk(KERN_ERR TTM_PFX "Buffer eviction failed\n"); + goto out; + } + + spin_lock(&bdev->lru_lock); + if (evict_mem.mm_node) { + drm_mm_put_block(evict_mem.mm_node); + evict_mem.mm_node = NULL; + } + spin_unlock(&bdev->lru_lock); + bo->evicted = true; +out: + return ret; +} + +/** + * 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_bo_device *bdev, + struct ttm_mem_reg *mem, + uint32_t mem_type, + bool interruptible, bool no_wait) +{ + struct drm_mm_node *node; + struct ttm_buffer_object *entry; + struct ttm_mem_type_manager *man = &bdev->man[mem_type]; + struct list_head *lru; + unsigned long num_pages = mem->num_pages; + int put_count = 0; + int ret; + +retry_pre_get: + ret = drm_mm_pre_get(&man->manager); + if (unlikely(ret != 0)) + return ret; + + spin_lock(&bdev->lru_lock); + do { + node = drm_mm_search_free(&man->manager, num_pages, + mem->page_alignment, 1); + if (node) + break; + + lru = &man->lru; + if (list_empty(lru)) + break; + + entry = list_first_entry(lru, struct ttm_buffer_object, lru); + kref_get(&entry->list_kref); + + ret = + ttm_bo_reserve_locked(entry, interruptible, no_wait, + false, 0); + + if (likely(ret == 0)) + put_count = ttm_bo_del_from_lru(entry); + + spin_unlock(&bdev->lru_lock); + + if (unlikely(ret != 0)) + return ret; + + while (put_count--) + kref_put(&entry->list_kref, ttm_bo_ref_bug); + + ret = ttm_bo_evict(entry, mem_type, interruptible, no_wait); + + ttm_bo_unreserve(entry); + + kref_put(&entry->list_kref, ttm_bo_release_list); + if (ret) + return ret; + + spin_lock(&bdev->lru_lock); + } while (1); + + if (!node) { + spin_unlock(&bdev->lru_lock); + return -ENOMEM; + } + + node = drm_mm_get_block_atomic(node, num_pages, mem->page_alignment); + if (unlikely(!node)) { + spin_unlock(&bdev->lru_lock); + goto retry_pre_get; + } + + spin_unlock(&bdev->lru_lock); + mem->mm_node = node; + mem->mem_type = mem_type; + return 0; +} + +static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man, + bool disallow_fixed, + uint32_t mem_type, + uint32_t mask, uint32_t *res_mask) +{ + uint32_t cur_flags = ttm_bo_type_flags(mem_type); + + if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) && disallow_fixed) + return false; + + if ((cur_flags & mask & TTM_PL_MASK_MEM) == 0) + return false; + + if ((mask & man->available_caching) == 0) + return false; + if (mask & man->default_caching) + cur_flags |= man->default_caching; + else if (mask & TTM_PL_FLAG_CACHED) + cur_flags |= TTM_PL_FLAG_CACHED; + else if (mask & TTM_PL_FLAG_WC) + cur_flags |= TTM_PL_FLAG_WC; + else + cur_flags |= TTM_PL_FLAG_UNCACHED; + + *res_mask = 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, + uint32_t proposed_placement, + struct ttm_mem_reg *mem, + bool interruptible, bool no_wait) +{ + struct ttm_bo_device *bdev = bo->bdev; + struct ttm_mem_type_manager *man; + + uint32_t num_prios = bdev->driver->num_mem_type_prio; + const uint32_t *prios = bdev->driver->mem_type_prio; + uint32_t i; + uint32_t mem_type = TTM_PL_SYSTEM; + uint32_t cur_flags = 0; + bool type_found = false; + bool type_ok = false; + bool has_eagain = false; + struct drm_mm_node *node = NULL; + int ret; + + mem->mm_node = NULL; + for (i = 0; i < num_prios; ++i) { + mem_type = prios[i]; + man = &bdev->man[mem_type]; + + type_ok = ttm_bo_mt_compatible(man, + bo->type == ttm_bo_type_user, + mem_type, proposed_placement, + &cur_flags); + + if (!type_ok) + continue; + + if (mem_type == TTM_PL_SYSTEM) + break; + + if (man->has_type && man->use_type) { + type_found = true; + do { + ret = drm_mm_pre_get(&man->manager); + if (unlikely(ret)) + return ret; + + spin_lock(&bdev->lru_lock); + node = drm_mm_search_free(&man->manager, + mem->num_pages, + mem->page_alignment, + 1); + if (unlikely(!node)) { + spin_unlock(&bdev->lru_lock); + break; + } + node = drm_mm_get_block_atomic(node, + mem->num_pages, + mem-> + page_alignment); + spin_unlock(&bdev->lru_lock); + } while (!node); + } + if (node) + break; + } + + if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || node) { + mem->mm_node = node; + mem->mem_type = mem_type; + mem->placement = cur_flags; + return 0; + } + + if (!type_found) + return -EINVAL; + + num_prios = bdev->driver->num_mem_busy_prio; + prios = bdev->driver->mem_busy_prio; + + for (i = 0; i < num_prios; ++i) { + mem_type = prios[i]; + man = &bdev->man[mem_type]; + + if (!man->has_type) + continue; + + if (!ttm_bo_mt_compatible(man, + bo->type == ttm_bo_type_user, + mem_type, + proposed_placement, &cur_flags)) + continue; + + ret = ttm_bo_mem_force_space(bdev, mem, mem_type, + interruptible, no_wait); + + if (ret == 0 && mem->mm_node) { + mem->placement = cur_flags; + return 0; + } + + if (ret == -ERESTART) + has_eagain = true; + } + + ret = (has_eagain) ? -ERESTART : -ENOMEM; + return ret; +} +EXPORT_SYMBOL(ttm_bo_mem_space); + +int ttm_bo_wait_cpu(struct ttm_buffer_object *bo, bool no_wait) +{ + int ret = 0; + + if ((atomic_read(&bo->cpu_writers) > 0) && no_wait) + return -EBUSY; + + ret = wait_event_interruptible(bo->event_queue, + atomic_read(&bo->cpu_writers) == 0); + + if (ret == -ERESTARTSYS) + ret = -ERESTART; + + return ret; +} + +int ttm_bo_move_buffer(struct ttm_buffer_object *bo, + uint32_t proposed_placement, + bool interruptible, bool no_wait) +{ + struct ttm_bo_device *bdev = bo->bdev; + int ret = 0; + struct ttm_mem_reg mem; + + BUG_ON(!atomic_read(&bo->reserved)); + + /* + * 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(&bo->lock); + ret = ttm_bo_wait(bo, false, interruptible, no_wait); + spin_unlock(&bo->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; + + /* + * Determine where to move the buffer. + */ + + ret = ttm_bo_mem_space(bo, proposed_placement, &mem, + interruptible, no_wait); + if (ret) + goto out_unlock; + + ret = ttm_bo_handle_move_mem(bo, &mem, false, interruptible, no_wait); + +out_unlock: + if (ret && mem.mm_node) { + spin_lock(&bdev->lru_lock); + drm_mm_put_block(mem.mm_node); + spin_unlock(&bdev->lru_lock); + } + return ret; +} + +static int ttm_bo_mem_compat(uint32_t proposed_placement, + struct ttm_mem_reg *mem) +{ + if ((proposed_placement & mem->placement & TTM_PL_MASK_MEM) == 0) + return 0; + if ((proposed_placement & mem->placement & TTM_PL_MASK_CACHING) == 0) + return 0; + + return 1; +} + +int ttm_buffer_object_validate(struct ttm_buffer_object *bo, + uint32_t proposed_placement, + bool interruptible, bool no_wait) +{ + int ret; + + BUG_ON(!atomic_read(&bo->reserved)); + bo->proposed_placement = proposed_placement; + + TTM_DEBUG("Proposed placement 0x%08lx, Old flags 0x%08lx\n", + (unsigned long)proposed_placement, + (unsigned long)bo->mem.placement); + + /* + * Check whether we need to move buffer. + */ + + if (!ttm_bo_mem_compat(bo->proposed_placement, &bo->mem)) { + ret = ttm_bo_move_buffer(bo, bo->proposed_placement, + interruptible, no_wait); + if (ret) { + if (ret != -ERESTART) + printk(KERN_ERR TTM_PFX + "Failed moving buffer. " + "Proposed placement 0x%08x\n", + bo->proposed_placement); + if (ret == -ENOMEM) + printk(KERN_ERR TTM_PFX + "Out of aperture space or " + "DRM memory quota.\n"); + return ret; + } + } + + /* + * 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; + } + /* + * Validation has succeeded, move the access and other + * non-mapping-related flag bits from the proposed flags to + * the active flags + */ + + ttm_flag_masked(&bo->mem.placement, bo->proposed_placement, + ~TTM_PL_MASK_MEMTYPE); + + return 0; +} +EXPORT_SYMBOL(ttm_buffer_object_validate); + +int +ttm_bo_check_placement(struct ttm_buffer_object *bo, + uint32_t set_flags, uint32_t clr_flags) +{ + uint32_t new_mask = set_flags | clr_flags; + + if ((bo->type == ttm_bo_type_user) && + (clr_flags & TTM_PL_FLAG_CACHED)) { + printk(KERN_ERR TTM_PFX + "User buffers require cache-coherent memory.\n"); + return -EINVAL; + } + + if (!capable(CAP_SYS_ADMIN)) { + if (new_mask & TTM_PL_FLAG_NO_EVICT) { + printk(KERN_ERR TTM_PFX "Need to be root to modify" + " NO_EVICT status.\n"); + return -EINVAL; + } + + if ((clr_flags & bo->mem.placement & TTM_PL_MASK_MEMTYPE) && + (bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) { + printk(KERN_ERR TTM_PFX + "Incompatible memory specification" + " for NO_EVICT buffer.\n"); + return -EINVAL; + } + } + return 0; +} + +int ttm_buffer_object_init(struct ttm_bo_device *bdev, + struct ttm_buffer_object *bo, + unsigned long size, + enum ttm_bo_type type, + uint32_t flags, + uint32_t page_alignment, + unsigned long buffer_start, + bool interruptible, + struct file *persistant_swap_storage, + size_t acc_size, + void (*destroy) (struct ttm_buffer_object *)) +{ + int ret = 0; + unsigned long num_pages; + + size += buffer_start & ~PAGE_MASK; + num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; + if (num_pages == 0) { + printk(KERN_ERR TTM_PFX "Illegal buffer object size.\n"); + return -EINVAL; + } + bo->destroy = destroy; + + spin_lock_init(&bo->lock); + 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); + bo->bdev = bdev; + bo->type = type; + bo->num_pages = num_pages; + 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->buffer_start = buffer_start & PAGE_MASK; + bo->priv_flags = 0; + bo->mem.placement = (TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED); + bo->seq_valid = false; + bo->persistant_swap_storage = persistant_swap_storage; + bo->acc_size = acc_size; + + ret = ttm_bo_check_placement(bo, flags, 0ULL); + if (unlikely(ret != 0)) + goto out_err; + + /* + * If no caching attributes are set, accept any form of caching. + */ + + if ((flags & TTM_PL_MASK_CACHING) == 0) + flags |= TTM_PL_MASK_CACHING; + + /* + * For ttm_bo_type_device buffers, allocate + * address space from the device. + */ + + if (bo->type == ttm_bo_type_device) { + ret = ttm_bo_setup_vm(bo); + if (ret) + goto out_err; + } + + ret = ttm_buffer_object_validate(bo, flags, 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_buffer_object_init); + +static inline size_t ttm_bo_size(struct ttm_bo_device *bdev, + unsigned long num_pages) +{ + size_t page_array_size = (num_pages * sizeof(void *) + PAGE_SIZE - 1) & + PAGE_MASK; + + return bdev->ttm_bo_size + 2 * page_array_size; +} + +int ttm_buffer_object_create(struct ttm_bo_device *bdev, + unsigned long size, + enum ttm_bo_type type, + uint32_t flags, + uint32_t page_alignment, + unsigned long buffer_start, + bool interruptible, + struct file *persistant_swap_storage, + struct ttm_buffer_object **p_bo) +{ + struct ttm_buffer_object *bo; + int ret; + struct ttm_mem_global *mem_glob = bdev->mem_glob; + + size_t acc_size = + ttm_bo_size(bdev, (size + PAGE_SIZE - 1) >> PAGE_SHIFT); + ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false, false); + if (unlikely(ret != 0)) + return ret; + + bo = kzalloc(sizeof(*bo), GFP_KERNEL); + + if (unlikely(bo == NULL)) { + ttm_mem_global_free(mem_glob, acc_size, false); + return -ENOMEM; + } + + ret = ttm_buffer_object_init(bdev, bo, size, type, flags, + page_alignment, buffer_start, + interruptible, + persistant_swap_storage, acc_size, NULL); + if (likely(ret == 0)) + *p_bo = bo; + + return ret; +} + +static int ttm_bo_leave_list(struct ttm_buffer_object *bo, + uint32_t mem_type, bool allow_errors) +{ + int ret; + + spin_lock(&bo->lock); + ret = ttm_bo_wait(bo, false, false, false); + spin_unlock(&bo->lock); + + if (ret && allow_errors) + goto out; + + if (bo->mem.mem_type == mem_type) + ret = ttm_bo_evict(bo, mem_type, false, false); + + if (ret) { + if (allow_errors) { + goto out; + } else { + ret = 0; + printk(KERN_ERR TTM_PFX "Cleanup eviction failed\n"); + } + } + +out: + return ret; +} + +static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev, + struct list_head *head, + unsigned mem_type, bool allow_errors) +{ + struct ttm_buffer_object *entry; + int ret; + int put_count; + + /* + * Can't use standard list traversal since we're unlocking. + */ + + spin_lock(&bdev->lru_lock); + + while (!list_empty(head)) { + entry = list_first_entry(head, struct ttm_buffer_object, lru); + kref_get(&entry->list_kref); + ret = ttm_bo_reserve_locked(entry, false, false, false, 0); + put_count = ttm_bo_del_from_lru(entry); + spin_unlock(&bdev->lru_lock); + while (put_count--) + kref_put(&entry->list_kref, ttm_bo_ref_bug); + BUG_ON(ret); + ret = ttm_bo_leave_list(entry, mem_type, allow_errors); + ttm_bo_unreserve(entry); + kref_put(&entry->list_kref, ttm_bo_release_list); + spin_lock(&bdev->lru_lock); + } + + spin_unlock(&bdev->lru_lock); + + return 0; +} + +int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type) +{ + struct ttm_mem_type_manager *man = &bdev->man[mem_type]; + int ret = -EINVAL; + + if (mem_type >= TTM_NUM_MEM_TYPES) { + printk(KERN_ERR TTM_PFX "Illegal memory type %d\n", mem_type); + return ret; + } + + if (!man->has_type) { + printk(KERN_ERR TTM_PFX "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, &man->lru, mem_type, false); + + spin_lock(&bdev->lru_lock); + if (drm_mm_clean(&man->manager)) + drm_mm_takedown(&man->manager); + else + ret = -EBUSY; + + spin_unlock(&bdev->lru_lock); + } + + 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) { + printk(KERN_ERR TTM_PFX + "Illegal memory manager memory type %u.\n", + mem_type); + return -EINVAL; + } + + if (!man->has_type) { + printk(KERN_ERR TTM_PFX + "Memory type %u has not been initialized.\n", + mem_type); + return 0; + } + + return ttm_bo_force_list_clean(bdev, &man->lru, mem_type, true); +} +EXPORT_SYMBOL(ttm_bo_evict_mm); + +int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type, + unsigned long p_offset, unsigned long p_size) +{ + int ret = -EINVAL; + struct ttm_mem_type_manager *man; + + if (type >= TTM_NUM_MEM_TYPES) { + printk(KERN_ERR TTM_PFX "Illegal memory type %d\n", type); + return ret; + } + + man = &bdev->man[type]; + if (man->has_type) { + printk(KERN_ERR TTM_PFX + "Memory manager already initialized for type %d\n", + type); + return ret; + } + + ret = bdev->driver->init_mem_type(bdev, type, man); + if (ret) + return ret; + + ret = 0; + if (type != TTM_PL_SYSTEM) { + if (!p_size) { + printk(KERN_ERR TTM_PFX + "Zero size memory manager type %d\n", + type); + return ret; + } + ret = drm_mm_init(&man->manager, p_offset, 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); + +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; + + 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; + printk(KERN_ERR TTM_PFX + "DRM memory manager type %d " + "is not clean.\n", i); + } + man->has_type = false; + } + } + + if (!cancel_delayed_work(&bdev->wq)) + flush_scheduled_work(); + + while (ttm_bo_delayed_delete(bdev, true)) + ; + + spin_lock(&bdev->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(&bdev->lru_lock); + + ttm_mem_unregister_shrink(bdev->mem_glob, &bdev->shrink); + 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); + + __free_page(bdev->dummy_read_page); + return ret; +} +EXPORT_SYMBOL(ttm_bo_device_release); + +/* + * This function is intended to be called on drm driver load. + * If you decide to call it from firstopen, you must protect the call + * from a potentially racing ttm_bo_driver_finish in lastclose. + * (This may happen on X server restart). + */ + +int ttm_bo_device_init(struct ttm_bo_device *bdev, + struct ttm_mem_global *mem_glob, + struct ttm_bo_driver *driver, uint64_t file_page_offset) +{ + int ret = -EINVAL; + + bdev->dummy_read_page = NULL; + rwlock_init(&bdev->vm_lock); + spin_lock_init(&bdev->lru_lock); + + bdev->driver = driver; + bdev->mem_glob = mem_glob; + + memset(bdev->man, 0, sizeof(bdev->man)); + + bdev->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32); + if (unlikely(bdev->dummy_read_page == NULL)) { + ret = -ENOMEM; + goto out_err0; + } + + /* + * Initialize the system memory buffer type. + * Other types need to be driver / IOCTL initialized. + */ + ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0, 0); + if (unlikely(ret != 0)) + goto out_err1; + + bdev->addr_space_rb = RB_ROOT; + ret = drm_mm_init(&bdev->addr_space_mm, file_page_offset, 0x10000000); + if (unlikely(ret != 0)) + goto out_err2; + + INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue); + bdev->nice_mode = true; + INIT_LIST_HEAD(&bdev->ddestroy); + INIT_LIST_HEAD(&bdev->swap_lru); + bdev->dev_mapping = NULL; + ttm_mem_init_shrink(&bdev->shrink, ttm_bo_swapout); + ret = ttm_mem_register_shrink(mem_glob, &bdev->shrink); + if (unlikely(ret != 0)) { + printk(KERN_ERR TTM_PFX + "Could not register buffer object swapout.\n"); + goto out_err2; + } + + bdev->ttm_bo_extra_size = + ttm_round_pot(sizeof(struct ttm_tt)) + + ttm_round_pot(sizeof(struct ttm_backend)); + + bdev->ttm_bo_size = bdev->ttm_bo_extra_size + + ttm_round_pot(sizeof(struct ttm_buffer_object)); + + return 0; +out_err2: + ttm_bo_clean_mm(bdev, 0); +out_err1: + __free_page(bdev->dummy_read_page); +out_err0: + 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; +} + +int ttm_bo_pci_offset(struct ttm_bo_device *bdev, + struct ttm_mem_reg *mem, + unsigned long *bus_base, + unsigned long *bus_offset, unsigned long *bus_size) +{ + struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type]; + + *bus_size = 0; + if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE)) + return -EINVAL; + + if (ttm_mem_reg_is_pci(bdev, mem)) { + *bus_offset = mem->mm_node->start << PAGE_SHIFT; + *bus_size = mem->num_pages << PAGE_SHIFT; + *bus_base = man->io_offset; + } + + return 0; +} + +void ttm_bo_unmap_virtual(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); +} + +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; + void *sync_obj; + void *sync_obj_arg; + int ret = 0; + + if (likely(bo->sync_obj == NULL)) + return 0; + + while (bo->sync_obj) { + + if (driver->sync_obj_signaled(bo->sync_obj, bo->sync_obj_arg)) { + void *tmp_obj = bo->sync_obj; + bo->sync_obj = NULL; + clear_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags); + spin_unlock(&bo->lock); + driver->sync_obj_unref(&tmp_obj); + spin_lock(&bo->lock); + continue; + } + + if (no_wait) + return -EBUSY; + + sync_obj = driver->sync_obj_ref(bo->sync_obj); + sync_obj_arg = bo->sync_obj_arg; + spin_unlock(&bo->lock); + ret = driver->sync_obj_wait(sync_obj, sync_obj_arg, + lazy, interruptible); + if (unlikely(ret != 0)) { + driver->sync_obj_unref(&sync_obj); + spin_lock(&bo->lock); + return ret; + } + spin_lock(&bo->lock); + if (likely(bo->sync_obj == sync_obj && + bo->sync_obj_arg == sync_obj_arg)) { + void *tmp_obj = bo->sync_obj; + bo->sync_obj = NULL; + clear_bit(TTM_BO_PRIV_FLAG_MOVING, + &bo->priv_flags); + spin_unlock(&bo->lock); + driver->sync_obj_unref(&sync_obj); + driver->sync_obj_unref(&tmp_obj); + spin_lock(&bo->lock); + } + } + return 0; +} +EXPORT_SYMBOL(ttm_bo_wait); + +void ttm_bo_unblock_reservation(struct ttm_buffer_object *bo) +{ + atomic_set(&bo->reserved, 0); + wake_up_all(&bo->event_queue); +} + +int ttm_bo_block_reservation(struct ttm_buffer_object *bo, bool interruptible, + bool no_wait) +{ + int ret; + + while (unlikely(atomic_cmpxchg(&bo->reserved, 0, 1) != 0)) { + if (no_wait) + return -EBUSY; + else if (interruptible) { + ret = wait_event_interruptible + (bo->event_queue, atomic_read(&bo->reserved) == 0); + if (unlikely(ret != 0)) + return -ERESTART; + } else { + wait_event(bo->event_queue, + atomic_read(&bo->reserved) == 0); + } + } + return 0; +} + +int ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait) +{ + int ret = 0; + + /* + * Using ttm_bo_reserve instead of ttm_bo_block_reservation + * 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(&bo->lock); + ret = ttm_bo_wait(bo, false, true, no_wait); + spin_unlock(&bo->lock); + if (likely(ret == 0)) + atomic_inc(&bo->cpu_writers); + ttm_bo_unreserve(bo); + return ret; +} + +void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo) +{ + if (atomic_dec_and_test(&bo->cpu_writers)) + wake_up_all(&bo->event_queue); +} + +/** + * 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_device *bdev = + container_of(shrink, struct ttm_bo_device, 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(&bdev->lru_lock); + while (ret == -EBUSY) { + if (unlikely(list_empty(&bdev->swap_lru))) { + spin_unlock(&bdev->lru_lock); + return -EBUSY; + } + + bo = list_first_entry(&bdev->swap_lru, + struct ttm_buffer_object, swap); + kref_get(&bo->list_kref); + + /** + * 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(&bdev->lru_lock); + ttm_bo_wait_unreserved(bo, false); + kref_put(&bo->list_kref, ttm_bo_release_list); + spin_lock(&bdev->lru_lock); + } + } + + BUG_ON(ret != 0); + put_count = ttm_bo_del_from_lru(bo); + spin_unlock(&bdev->lru_lock); + + while (put_count--) + kref_put(&bo->list_kref, ttm_bo_ref_bug); + + /** + * Wait for GPU, then move to system cached. + */ + + spin_lock(&bo->lock); + ret = ttm_bo_wait(bo, false, false, false); + spin_unlock(&bo->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. + */ + + ret = ttm_tt_swapout(bo->ttm, bo->persistant_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->shrink) == 0) + ; +} |