// SPDX-License-Identifier: GPL-2.0 OR MIT /************************************************************************** * * Copyright 2009-2015 VMware, Inc., Palo Alto, CA., USA * * 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. * **************************************************************************/ #include #include "vmwgfx_resource_priv.h" #include "vmwgfx_binding.h" #include "vmwgfx_drv.h" #define VMW_RES_EVICT_ERR_COUNT 10 /** * vmw_resource_mob_attach - Mark a resource as attached to its backing mob * @res: The resource */ void vmw_resource_mob_attach(struct vmw_resource *res) { struct vmw_buffer_object *backup = res->backup; struct rb_node **new = &backup->res_tree.rb_node, *parent = NULL; dma_resv_assert_held(res->backup->base.base.resv); res->used_prio = (res->res_dirty) ? res->func->dirty_prio : res->func->prio; while (*new) { struct vmw_resource *this = container_of(*new, struct vmw_resource, mob_node); parent = *new; new = (res->backup_offset < this->backup_offset) ? &((*new)->rb_left) : &((*new)->rb_right); } rb_link_node(&res->mob_node, parent, new); rb_insert_color(&res->mob_node, &backup->res_tree); vmw_bo_prio_add(backup, res->used_prio); } /** * vmw_resource_mob_detach - Mark a resource as detached from its backing mob * @res: The resource */ void vmw_resource_mob_detach(struct vmw_resource *res) { struct vmw_buffer_object *backup = res->backup; dma_resv_assert_held(backup->base.base.resv); if (vmw_resource_mob_attached(res)) { rb_erase(&res->mob_node, &backup->res_tree); RB_CLEAR_NODE(&res->mob_node); vmw_bo_prio_del(backup, res->used_prio); } } struct vmw_resource *vmw_resource_reference(struct vmw_resource *res) { kref_get(&res->kref); return res; } struct vmw_resource * vmw_resource_reference_unless_doomed(struct vmw_resource *res) { return kref_get_unless_zero(&res->kref) ? res : NULL; } /** * vmw_resource_release_id - release a resource id to the id manager. * * @res: Pointer to the resource. * * Release the resource id to the resource id manager and set it to -1 */ void vmw_resource_release_id(struct vmw_resource *res) { struct vmw_private *dev_priv = res->dev_priv; struct idr *idr = &dev_priv->res_idr[res->func->res_type]; spin_lock(&dev_priv->resource_lock); if (res->id != -1) idr_remove(idr, res->id); res->id = -1; spin_unlock(&dev_priv->resource_lock); } static void vmw_resource_release(struct kref *kref) { struct vmw_resource *res = container_of(kref, struct vmw_resource, kref); struct vmw_private *dev_priv = res->dev_priv; int id; struct idr *idr = &dev_priv->res_idr[res->func->res_type]; spin_lock(&dev_priv->resource_lock); list_del_init(&res->lru_head); spin_unlock(&dev_priv->resource_lock); if (res->backup) { struct ttm_buffer_object *bo = &res->backup->base; ttm_bo_reserve(bo, false, false, NULL); if (vmw_resource_mob_attached(res) && res->func->unbind != NULL) { struct ttm_validate_buffer val_buf; val_buf.bo = bo; val_buf.num_shared = 0; res->func->unbind(res, false, &val_buf); } res->backup_dirty = false; vmw_resource_mob_detach(res); if (res->dirty) res->func->dirty_free(res); if (res->coherent) vmw_bo_dirty_release(res->backup); ttm_bo_unreserve(bo); vmw_bo_unreference(&res->backup); } if (likely(res->hw_destroy != NULL)) { mutex_lock(&dev_priv->binding_mutex); vmw_binding_res_list_kill(&res->binding_head); mutex_unlock(&dev_priv->binding_mutex); res->hw_destroy(res); } id = res->id; if (res->res_free != NULL) res->res_free(res); else kfree(res); spin_lock(&dev_priv->resource_lock); if (id != -1) idr_remove(idr, id); spin_unlock(&dev_priv->resource_lock); } void vmw_resource_unreference(struct vmw_resource **p_res) { struct vmw_resource *res = *p_res; *p_res = NULL; kref_put(&res->kref, vmw_resource_release); } /** * vmw_resource_alloc_id - release a resource id to the id manager. * * @res: Pointer to the resource. * * Allocate the lowest free resource from the resource manager, and set * @res->id to that id. Returns 0 on success and -ENOMEM on failure. */ int vmw_resource_alloc_id(struct vmw_resource *res) { struct vmw_private *dev_priv = res->dev_priv; int ret; struct idr *idr = &dev_priv->res_idr[res->func->res_type]; BUG_ON(res->id != -1); idr_preload(GFP_KERNEL); spin_lock(&dev_priv->resource_lock); ret = idr_alloc(idr, res, 1, 0, GFP_NOWAIT); if (ret >= 0) res->id = ret; spin_unlock(&dev_priv->resource_lock); idr_preload_end(); return ret < 0 ? ret : 0; } /** * vmw_resource_init - initialize a struct vmw_resource * * @dev_priv: Pointer to a device private struct. * @res: The struct vmw_resource to initialize. * @delay_id: Boolean whether to defer device id allocation until * the first validation. * @res_free: Resource destructor. * @func: Resource function table. */ int vmw_resource_init(struct vmw_private *dev_priv, struct vmw_resource *res, bool delay_id, void (*res_free) (struct vmw_resource *res), const struct vmw_res_func *func) { kref_init(&res->kref); res->hw_destroy = NULL; res->res_free = res_free; res->dev_priv = dev_priv; res->func = func; RB_CLEAR_NODE(&res->mob_node); INIT_LIST_HEAD(&res->lru_head); INIT_LIST_HEAD(&res->binding_head); res->id = -1; res->backup = NULL; res->backup_offset = 0; res->backup_dirty = false; res->res_dirty = false; res->coherent = false; res->used_prio = 3; res->dirty = NULL; if (delay_id) return 0; else return vmw_resource_alloc_id(res); } /** * vmw_user_resource_lookup_handle - lookup a struct resource from a * TTM user-space handle and perform basic type checks * * @dev_priv: Pointer to a device private struct * @tfile: Pointer to a struct ttm_object_file identifying the caller * @handle: The TTM user-space handle * @converter: Pointer to an object describing the resource type * @p_res: On successful return the location pointed to will contain * a pointer to a refcounted struct vmw_resource. * * If the handle can't be found or is associated with an incorrect resource * type, -EINVAL will be returned. */ int vmw_user_resource_lookup_handle(struct vmw_private *dev_priv, struct ttm_object_file *tfile, uint32_t handle, const struct vmw_user_resource_conv *converter, struct vmw_resource **p_res) { struct ttm_base_object *base; struct vmw_resource *res; int ret = -EINVAL; base = ttm_base_object_lookup(tfile, handle); if (unlikely(base == NULL)) return -EINVAL; if (unlikely(ttm_base_object_type(base) != converter->object_type)) goto out_bad_resource; res = converter->base_obj_to_res(base); kref_get(&res->kref); *p_res = res; ret = 0; out_bad_resource: ttm_base_object_unref(&base); return ret; } /** * vmw_user_resource_lookup_handle - lookup a struct resource from a * TTM user-space handle and perform basic type checks * * @dev_priv: Pointer to a device private struct * @tfile: Pointer to a struct ttm_object_file identifying the caller * @handle: The TTM user-space handle * @converter: Pointer to an object describing the resource type * * If the handle can't be found or is associated with an incorrect resource * type, -EINVAL will be returned. */ struct vmw_resource * vmw_user_resource_noref_lookup_handle(struct vmw_private *dev_priv, struct ttm_object_file *tfile, uint32_t handle, const struct vmw_user_resource_conv *converter) { struct ttm_base_object *base; base = ttm_base_object_noref_lookup(tfile, handle); if (!base) return ERR_PTR(-ESRCH); if (unlikely(ttm_base_object_type(base) != converter->object_type)) { ttm_base_object_noref_release(); return ERR_PTR(-EINVAL); } return converter->base_obj_to_res(base); } /* * Helper function that looks either a surface or bo. * * The pointer this pointed at by out_surf and out_buf needs to be null. */ int vmw_user_lookup_handle(struct vmw_private *dev_priv, struct ttm_object_file *tfile, uint32_t handle, struct vmw_surface **out_surf, struct vmw_buffer_object **out_buf) { struct vmw_resource *res; int ret; BUG_ON(*out_surf || *out_buf); ret = vmw_user_resource_lookup_handle(dev_priv, tfile, handle, user_surface_converter, &res); if (!ret) { *out_surf = vmw_res_to_srf(res); return 0; } *out_surf = NULL; ret = vmw_user_bo_lookup(tfile, handle, out_buf, NULL); return ret; } /** * vmw_resource_buf_alloc - Allocate a backup buffer for a resource. * * @res: The resource for which to allocate a backup buffer. * @interruptible: Whether any sleeps during allocation should be * performed while interruptible. */ static int vmw_resource_buf_alloc(struct vmw_resource *res, bool interruptible) { unsigned long size = (res->backup_size + PAGE_SIZE - 1) & PAGE_MASK; struct vmw_buffer_object *backup; int ret; if (likely(res->backup)) { BUG_ON(res->backup->base.base.size < size); return 0; } backup = kzalloc(sizeof(*backup), GFP_KERNEL); if (unlikely(!backup)) return -ENOMEM; ret = vmw_bo_init(res->dev_priv, backup, res->backup_size, res->func->backup_placement, interruptible, false, &vmw_bo_bo_free); if (unlikely(ret != 0)) goto out_no_bo; res->backup = backup; out_no_bo: return ret; } /** * vmw_resource_do_validate - Make a resource up-to-date and visible * to the device. * * @res: The resource to make visible to the device. * @val_buf: Information about a buffer possibly * containing backup data if a bind operation is needed. * @dirtying: Transfer dirty regions. * * On hardware resource shortage, this function returns -EBUSY and * should be retried once resources have been freed up. */ static int vmw_resource_do_validate(struct vmw_resource *res, struct ttm_validate_buffer *val_buf, bool dirtying) { int ret = 0; const struct vmw_res_func *func = res->func; if (unlikely(res->id == -1)) { ret = func->create(res); if (unlikely(ret != 0)) return ret; } if (func->bind && ((func->needs_backup && !vmw_resource_mob_attached(res) && val_buf->bo != NULL) || (!func->needs_backup && val_buf->bo != NULL))) { ret = func->bind(res, val_buf); if (unlikely(ret != 0)) goto out_bind_failed; if (func->needs_backup) vmw_resource_mob_attach(res); } /* * Handle the case where the backup mob is marked coherent but * the resource isn't. */ if (func->dirty_alloc && vmw_resource_mob_attached(res) && !res->coherent) { if (res->backup->dirty && !res->dirty) { ret = func->dirty_alloc(res); if (ret) return ret; } else if (!res->backup->dirty && res->dirty) { func->dirty_free(res); } } /* * Transfer the dirty regions to the resource and update * the resource. */ if (res->dirty) { if (dirtying && !res->res_dirty) { pgoff_t start = res->backup_offset >> PAGE_SHIFT; pgoff_t end = __KERNEL_DIV_ROUND_UP (res->backup_offset + res->backup_size, PAGE_SIZE); vmw_bo_dirty_unmap(res->backup, start, end); } vmw_bo_dirty_transfer_to_res(res); return func->dirty_sync(res); } return 0; out_bind_failed: func->destroy(res); return ret; } /** * vmw_resource_unreserve - Unreserve a resource previously reserved for * command submission. * * @res: Pointer to the struct vmw_resource to unreserve. * @dirty_set: Change dirty status of the resource. * @dirty: When changing dirty status indicates the new status. * @switch_backup: Backup buffer has been switched. * @new_backup: Pointer to new backup buffer if command submission * switched. May be NULL. * @new_backup_offset: New backup offset if @switch_backup is true. * * Currently unreserving a resource means putting it back on the device's * resource lru list, so that it can be evicted if necessary. */ void vmw_resource_unreserve(struct vmw_resource *res, bool dirty_set, bool dirty, bool switch_backup, struct vmw_buffer_object *new_backup, unsigned long new_backup_offset) { struct vmw_private *dev_priv = res->dev_priv; if (!list_empty(&res->lru_head)) return; if (switch_backup && new_backup != res->backup) { if (res->backup) { vmw_resource_mob_detach(res); if (res->coherent) vmw_bo_dirty_release(res->backup); vmw_bo_unreference(&res->backup); } if (new_backup) { res->backup = vmw_bo_reference(new_backup); /* * The validation code should already have added a * dirty tracker here. */ WARN_ON(res->coherent && !new_backup->dirty); vmw_resource_mob_attach(res); } else { res->backup = NULL; } } else if (switch_backup && res->coherent) { vmw_bo_dirty_release(res->backup); } if (switch_backup) res->backup_offset = new_backup_offset; if (dirty_set) res->res_dirty = dirty; if (!res->func->may_evict || res->id == -1 || res->pin_count) return; spin_lock(&dev_priv->resource_lock); list_add_tail(&res->lru_head, &res->dev_priv->res_lru[res->func->res_type]); spin_unlock(&dev_priv->resource_lock); } /** * vmw_resource_check_buffer - Check whether a backup buffer is needed * for a resource and in that case, allocate * one, reserve and validate it. * * @ticket: The ww aqcquire context to use, or NULL if trylocking. * @res: The resource for which to allocate a backup buffer. * @interruptible: Whether any sleeps during allocation should be * performed while interruptible. * @val_buf: On successful return contains data about the * reserved and validated backup buffer. */ static int vmw_resource_check_buffer(struct ww_acquire_ctx *ticket, struct vmw_resource *res, bool interruptible, struct ttm_validate_buffer *val_buf) { struct ttm_operation_ctx ctx = { true, false }; struct list_head val_list; bool backup_dirty = false; int ret; if (unlikely(res->backup == NULL)) { ret = vmw_resource_buf_alloc(res, interruptible); if (unlikely(ret != 0)) return ret; } INIT_LIST_HEAD(&val_list); ttm_bo_get(&res->backup->base); val_buf->bo = &res->backup->base; val_buf->num_shared = 0; list_add_tail(&val_buf->head, &val_list); ret = ttm_eu_reserve_buffers(ticket, &val_list, interruptible, NULL); if (unlikely(ret != 0)) goto out_no_reserve; if (res->func->needs_backup && !vmw_resource_mob_attached(res)) return 0; backup_dirty = res->backup_dirty; ret = ttm_bo_validate(&res->backup->base, res->func->backup_placement, &ctx); if (unlikely(ret != 0)) goto out_no_validate; return 0; out_no_validate: ttm_eu_backoff_reservation(ticket, &val_list); out_no_reserve: ttm_bo_put(val_buf->bo); val_buf->bo = NULL; if (backup_dirty) vmw_bo_unreference(&res->backup); return ret; } /* * vmw_resource_reserve - Reserve a resource for command submission * * @res: The resource to reserve. * * This function takes the resource off the LRU list and make sure * a backup buffer is present for guest-backed resources. However, * the buffer may not be bound to the resource at this point. * */ int vmw_resource_reserve(struct vmw_resource *res, bool interruptible, bool no_backup) { struct vmw_private *dev_priv = res->dev_priv; int ret; spin_lock(&dev_priv->resource_lock); list_del_init(&res->lru_head); spin_unlock(&dev_priv->resource_lock); if (res->func->needs_backup && res->backup == NULL && !no_backup) { ret = vmw_resource_buf_alloc(res, interruptible); if (unlikely(ret != 0)) { DRM_ERROR("Failed to allocate a backup buffer " "of size %lu. bytes\n", (unsigned long) res->backup_size); return ret; } } return 0; } /** * vmw_resource_backoff_reservation - Unreserve and unreference a * backup buffer *. * @ticket: The ww acquire ctx used for reservation. * @val_buf: Backup buffer information. */ static void vmw_resource_backoff_reservation(struct ww_acquire_ctx *ticket, struct ttm_validate_buffer *val_buf) { struct list_head val_list; if (likely(val_buf->bo == NULL)) return; INIT_LIST_HEAD(&val_list); list_add_tail(&val_buf->head, &val_list); ttm_eu_backoff_reservation(ticket, &val_list); ttm_bo_put(val_buf->bo); val_buf->bo = NULL; } /** * vmw_resource_do_evict - Evict a resource, and transfer its data * to a backup buffer. * * @ticket: The ww acquire ticket to use, or NULL if trylocking. * @res: The resource to evict. * @interruptible: Whether to wait interruptible. */ static int vmw_resource_do_evict(struct ww_acquire_ctx *ticket, struct vmw_resource *res, bool interruptible) { struct ttm_validate_buffer val_buf; const struct vmw_res_func *func = res->func; int ret; BUG_ON(!func->may_evict); val_buf.bo = NULL; val_buf.num_shared = 0; ret = vmw_resource_check_buffer(ticket, res, interruptible, &val_buf); if (unlikely(ret != 0)) return ret; if (unlikely(func->unbind != NULL && (!func->needs_backup || vmw_resource_mob_attached(res)))) { ret = func->unbind(res, res->res_dirty, &val_buf); if (unlikely(ret != 0)) goto out_no_unbind; vmw_resource_mob_detach(res); } ret = func->destroy(res); res->backup_dirty = true; res->res_dirty = false; out_no_unbind: vmw_resource_backoff_reservation(ticket, &val_buf); return ret; } /** * vmw_resource_validate - Make a resource up-to-date and visible * to the device. * @res: The resource to make visible to the device. * @intr: Perform waits interruptible if possible. * @dirtying: Pending GPU operation will dirty the resource * * On succesful return, any backup DMA buffer pointed to by @res->backup will * be reserved and validated. * On hardware resource shortage, this function will repeatedly evict * resources of the same type until the validation succeeds. * * Return: Zero on success, -ERESTARTSYS if interrupted, negative error code * on failure. */ int vmw_resource_validate(struct vmw_resource *res, bool intr, bool dirtying) { int ret; struct vmw_resource *evict_res; struct vmw_private *dev_priv = res->dev_priv; struct list_head *lru_list = &dev_priv->res_lru[res->func->res_type]; struct ttm_validate_buffer val_buf; unsigned err_count = 0; if (!res->func->create) return 0; val_buf.bo = NULL; val_buf.num_shared = 0; if (res->backup) val_buf.bo = &res->backup->base; do { ret = vmw_resource_do_validate(res, &val_buf, dirtying); if (likely(ret != -EBUSY)) break; spin_lock(&dev_priv->resource_lock); if (list_empty(lru_list) || !res->func->may_evict) { DRM_ERROR("Out of device device resources " "for %s.\n", res->func->type_name); ret = -EBUSY; spin_unlock(&dev_priv->resource_lock); break; } evict_res = vmw_resource_reference (list_first_entry(lru_list, struct vmw_resource, lru_head)); list_del_init(&evict_res->lru_head); spin_unlock(&dev_priv->resource_lock); /* Trylock backup buffers with a NULL ticket. */ ret = vmw_resource_do_evict(NULL, evict_res, intr); if (unlikely(ret != 0)) { spin_lock(&dev_priv->resource_lock); list_add_tail(&evict_res->lru_head, lru_list); spin_unlock(&dev_priv->resource_lock); if (ret == -ERESTARTSYS || ++err_count > VMW_RES_EVICT_ERR_COUNT) { vmw_resource_unreference(&evict_res); goto out_no_validate; } } vmw_resource_unreference(&evict_res); } while (1); if (unlikely(ret != 0)) goto out_no_validate; else if (!res->func->needs_backup && res->backup) { WARN_ON_ONCE(vmw_resource_mob_attached(res)); vmw_bo_unreference(&res->backup); } return 0; out_no_validate: return ret; } /** * vmw_resource_unbind_list * * @vbo: Pointer to the current backing MOB. * * Evicts the Guest Backed hardware resource if the backup * buffer is being moved out of MOB memory. * Note that this function will not race with the resource * validation code, since resource validation and eviction * both require the backup buffer to be reserved. */ void vmw_resource_unbind_list(struct vmw_buffer_object *vbo) { struct ttm_validate_buffer val_buf = { .bo = &vbo->base, .num_shared = 0 }; dma_resv_assert_held(vbo->base.base.resv); while (!RB_EMPTY_ROOT(&vbo->res_tree)) { struct rb_node *node = vbo->res_tree.rb_node; struct vmw_resource *res = container_of(node, struct vmw_resource, mob_node); if (!WARN_ON_ONCE(!res->func->unbind)) (void) res->func->unbind(res, res->res_dirty, &val_buf); res->backup_dirty = true; res->res_dirty = false; vmw_resource_mob_detach(res); } (void) ttm_bo_wait(&vbo->base, false, false); } /** * vmw_query_readback_all - Read back cached query states * * @dx_query_mob: Buffer containing the DX query MOB * * Read back cached states from the device if they exist. This function * assumings binding_mutex is held. */ int vmw_query_readback_all(struct vmw_buffer_object *dx_query_mob) { struct vmw_resource *dx_query_ctx; struct vmw_private *dev_priv; struct { SVGA3dCmdHeader header; SVGA3dCmdDXReadbackAllQuery body; } *cmd; /* No query bound, so do nothing */ if (!dx_query_mob || !dx_query_mob->dx_query_ctx) return 0; dx_query_ctx = dx_query_mob->dx_query_ctx; dev_priv = dx_query_ctx->dev_priv; cmd = VMW_CMD_CTX_RESERVE(dev_priv, sizeof(*cmd), dx_query_ctx->id); if (unlikely(cmd == NULL)) return -ENOMEM; cmd->header.id = SVGA_3D_CMD_DX_READBACK_ALL_QUERY; cmd->header.size = sizeof(cmd->body); cmd->body.cid = dx_query_ctx->id; vmw_cmd_commit(dev_priv, sizeof(*cmd)); /* Triggers a rebind the next time affected context is bound */ dx_query_mob->dx_query_ctx = NULL; return 0; } /** * vmw_query_move_notify - Read back cached query states * * @bo: The TTM buffer object about to move. * @old_mem: The memory region @bo is moving from. * @new_mem: The memory region @bo is moving to. * * Called before the query MOB is swapped out to read back cached query * states from the device. */ void vmw_query_move_notify(struct ttm_buffer_object *bo, struct ttm_resource *old_mem, struct ttm_resource *new_mem) { struct vmw_buffer_object *dx_query_mob; struct ttm_device *bdev = bo->bdev; struct vmw_private *dev_priv; dev_priv = container_of(bdev, struct vmw_private, bdev); mutex_lock(&dev_priv->binding_mutex); dx_query_mob = container_of(bo, struct vmw_buffer_object, base); if (!dx_query_mob || !dx_query_mob->dx_query_ctx) { mutex_unlock(&dev_priv->binding_mutex); return; } /* If BO is being moved from MOB to system memory */ if (new_mem->mem_type == TTM_PL_SYSTEM && old_mem->mem_type == VMW_PL_MOB) { struct vmw_fence_obj *fence; (void) vmw_query_readback_all(dx_query_mob); mutex_unlock(&dev_priv->binding_mutex); /* Create a fence and attach the BO to it */ (void) vmw_execbuf_fence_commands(NULL, dev_priv, &fence, NULL); vmw_bo_fence_single(bo, fence); if (fence != NULL) vmw_fence_obj_unreference(&fence); (void) ttm_bo_wait(bo, false, false); } else mutex_unlock(&dev_priv->binding_mutex); } /** * vmw_resource_needs_backup - Return whether a resource needs a backup buffer. * * @res: The resource being queried. */ bool vmw_resource_needs_backup(const struct vmw_resource *res) { return res->func->needs_backup; } /** * vmw_resource_evict_type - Evict all resources of a specific type * * @dev_priv: Pointer to a device private struct * @type: The resource type to evict * * To avoid thrashing starvation or as part of the hibernation sequence, * try to evict all evictable resources of a specific type. */ static void vmw_resource_evict_type(struct vmw_private *dev_priv, enum vmw_res_type type) { struct list_head *lru_list = &dev_priv->res_lru[type]; struct vmw_resource *evict_res; unsigned err_count = 0; int ret; struct ww_acquire_ctx ticket; do { spin_lock(&dev_priv->resource_lock); if (list_empty(lru_list)) goto out_unlock; evict_res = vmw_resource_reference( list_first_entry(lru_list, struct vmw_resource, lru_head)); list_del_init(&evict_res->lru_head); spin_unlock(&dev_priv->resource_lock); /* Wait lock backup buffers with a ticket. */ ret = vmw_resource_do_evict(&ticket, evict_res, false); if (unlikely(ret != 0)) { spin_lock(&dev_priv->resource_lock); list_add_tail(&evict_res->lru_head, lru_list); spin_unlock(&dev_priv->resource_lock); if (++err_count > VMW_RES_EVICT_ERR_COUNT) { vmw_resource_unreference(&evict_res); return; } } vmw_resource_unreference(&evict_res); } while (1); out_unlock: spin_unlock(&dev_priv->resource_lock); } /** * vmw_resource_evict_all - Evict all evictable resources * * @dev_priv: Pointer to a device private struct * * To avoid thrashing starvation or as part of the hibernation sequence, * evict all evictable resources. In particular this means that all * guest-backed resources that are registered with the device are * evicted and the OTable becomes clean. */ void vmw_resource_evict_all(struct vmw_private *dev_priv) { enum vmw_res_type type; mutex_lock(&dev_priv->cmdbuf_mutex); for (type = 0; type < vmw_res_max; ++type) vmw_resource_evict_type(dev_priv, type); mutex_unlock(&dev_priv->cmdbuf_mutex); } /* * vmw_resource_pin - Add a pin reference on a resource * * @res: The resource to add a pin reference on * * This function adds a pin reference, and if needed validates the resource. * Having a pin reference means that the resource can never be evicted, and * its id will never change as long as there is a pin reference. * This function returns 0 on success and a negative error code on failure. */ int vmw_resource_pin(struct vmw_resource *res, bool interruptible) { struct ttm_operation_ctx ctx = { interruptible, false }; struct vmw_private *dev_priv = res->dev_priv; int ret; ttm_write_lock(&dev_priv->reservation_sem, interruptible); mutex_lock(&dev_priv->cmdbuf_mutex); ret = vmw_resource_reserve(res, interruptible, false); if (ret) goto out_no_reserve; if (res->pin_count == 0) { struct vmw_buffer_object *vbo = NULL; if (res->backup) { vbo = res->backup; ttm_bo_reserve(&vbo->base, interruptible, false, NULL); if (!vbo->base.pin_count) { ret = ttm_bo_validate (&vbo->base, res->func->backup_placement, &ctx); if (ret) { ttm_bo_unreserve(&vbo->base); goto out_no_validate; } } /* Do we really need to pin the MOB as well? */ vmw_bo_pin_reserved(vbo, true); } ret = vmw_resource_validate(res, interruptible, true); if (vbo) ttm_bo_unreserve(&vbo->base); if (ret) goto out_no_validate; } res->pin_count++; out_no_validate: vmw_resource_unreserve(res, false, false, false, NULL, 0UL); out_no_reserve: mutex_unlock(&dev_priv->cmdbuf_mutex); ttm_write_unlock(&dev_priv->reservation_sem); return ret; } /** * vmw_resource_unpin - Remove a pin reference from a resource * * @res: The resource to remove a pin reference from * * Having a pin reference means that the resource can never be evicted, and * its id will never change as long as there is a pin reference. */ void vmw_resource_unpin(struct vmw_resource *res) { struct vmw_private *dev_priv = res->dev_priv; int ret; (void) ttm_read_lock(&dev_priv->reservation_sem, false); mutex_lock(&dev_priv->cmdbuf_mutex); ret = vmw_resource_reserve(res, false, true); WARN_ON(ret); WARN_ON(res->pin_count == 0); if (--res->pin_count == 0 && res->backup) { struct vmw_buffer_object *vbo = res->backup; (void) ttm_bo_reserve(&vbo->base, false, false, NULL); vmw_bo_pin_reserved(vbo, false); ttm_bo_unreserve(&vbo->base); } vmw_resource_unreserve(res, false, false, false, NULL, 0UL); mutex_unlock(&dev_priv->cmdbuf_mutex); ttm_read_unlock(&dev_priv->reservation_sem); } /** * vmw_res_type - Return the resource type * * @res: Pointer to the resource */ enum vmw_res_type vmw_res_type(const struct vmw_resource *res) { return res->func->res_type; } /** * vmw_resource_update_dirty - Update a resource's dirty tracker with a * sequential range of touched backing store memory. * @res: The resource. * @start: The first page touched. * @end: The last page touched + 1. */ void vmw_resource_dirty_update(struct vmw_resource *res, pgoff_t start, pgoff_t end) { if (res->dirty) res->func->dirty_range_add(res, start << PAGE_SHIFT, end << PAGE_SHIFT); } /** * vmw_resources_clean - Clean resources intersecting a mob range * @vbo: The mob buffer object * @start: The mob page offset starting the range * @end: The mob page offset ending the range * @num_prefault: Returns how many pages including the first have been * cleaned and are ok to prefault */ int vmw_resources_clean(struct vmw_buffer_object *vbo, pgoff_t start, pgoff_t end, pgoff_t *num_prefault) { struct rb_node *cur = vbo->res_tree.rb_node; struct vmw_resource *found = NULL; unsigned long res_start = start << PAGE_SHIFT; unsigned long res_end = end << PAGE_SHIFT; unsigned long last_cleaned = 0; /* * Find the resource with lowest backup_offset that intersects the * range. */ while (cur) { struct vmw_resource *cur_res = container_of(cur, struct vmw_resource, mob_node); if (cur_res->backup_offset >= res_end) { cur = cur->rb_left; } else if (cur_res->backup_offset + cur_res->backup_size <= res_start) { cur = cur->rb_right; } else { found = cur_res; cur = cur->rb_left; /* Continue to look for resources with lower offsets */ } } /* * In order of increasing backup_offset, clean dirty resorces * intersecting the range. */ while (found) { if (found->res_dirty) { int ret; if (!found->func->clean) return -EINVAL; ret = found->func->clean(found); if (ret) return ret; found->res_dirty = false; } last_cleaned = found->backup_offset + found->backup_size; cur = rb_next(&found->mob_node); if (!cur) break; found = container_of(cur, struct vmw_resource, mob_node); if (found->backup_offset >= res_end) break; } /* * Set number of pages allowed prefaulting and fence the buffer object */ *num_prefault = 1; if (last_cleaned > res_start) { struct ttm_buffer_object *bo = &vbo->base; *num_prefault = __KERNEL_DIV_ROUND_UP(last_cleaned - res_start, PAGE_SIZE); vmw_bo_fence_single(bo, NULL); if (bo->moving) dma_fence_put(bo->moving); bo->moving = dma_fence_get (dma_resv_get_excl(bo->base.resv)); } return 0; }