![Brad Volkin](/assets/img/avatar_default.png)
By adding a new exec_entry flag, we cleanly mark the shadow objects as purgeable after they are on the active list. v2: - Move 'shadow_batch_obj->madv = I915_MADV_WILLNEED' inside _get fnc (danvet, from v4 6/7 feedback) v3: - Remove duplicate 'madv = I915_MADV_WILLNEED' (danvet, from v6 4/5) Issue: VIZ-4719 Signed-off-by: Brad Volkin <bradley.d.volkin@intel.com> Reviewed-By: Jon Bloomfield <jon.bloomfield@intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
138 lines
4.1 KiB
C
138 lines
4.1 KiB
C
/*
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* Copyright © 2014 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*
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*/
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#include "i915_drv.h"
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/**
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* DOC: batch pool
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*
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* In order to submit batch buffers as 'secure', the software command parser
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* must ensure that a batch buffer cannot be modified after parsing. It does
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* this by copying the user provided batch buffer contents to a kernel owned
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* buffer from which the hardware will actually execute, and by carefully
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* managing the address space bindings for such buffers.
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*
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* The batch pool framework provides a mechanism for the driver to manage a
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* set of scratch buffers to use for this purpose. The framework can be
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* extended to support other uses cases should they arise.
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*/
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/**
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* i915_gem_batch_pool_init() - initialize a batch buffer pool
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* @dev: the drm device
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* @pool: the batch buffer pool
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*/
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void i915_gem_batch_pool_init(struct drm_device *dev,
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struct i915_gem_batch_pool *pool)
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{
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pool->dev = dev;
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INIT_LIST_HEAD(&pool->cache_list);
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}
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/**
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* i915_gem_batch_pool_fini() - clean up a batch buffer pool
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* @pool: the pool to clean up
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*
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* Note: Callers must hold the struct_mutex.
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*/
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void i915_gem_batch_pool_fini(struct i915_gem_batch_pool *pool)
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{
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WARN_ON(!mutex_is_locked(&pool->dev->struct_mutex));
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while (!list_empty(&pool->cache_list)) {
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struct drm_i915_gem_object *obj =
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list_first_entry(&pool->cache_list,
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struct drm_i915_gem_object,
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batch_pool_list);
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WARN_ON(obj->active);
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list_del_init(&obj->batch_pool_list);
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drm_gem_object_unreference(&obj->base);
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}
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}
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/**
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* i915_gem_batch_pool_get() - select a buffer from the pool
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* @pool: the batch buffer pool
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* @size: the minimum desired size of the returned buffer
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*
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* Finds or allocates a batch buffer in the pool with at least the requested
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* size. The caller is responsible for any domain, active/inactive, or
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* purgeability management for the returned buffer.
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*
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* Note: Callers must hold the struct_mutex
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*
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* Return: the selected batch buffer object
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*/
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struct drm_i915_gem_object *
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i915_gem_batch_pool_get(struct i915_gem_batch_pool *pool,
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size_t size)
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{
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struct drm_i915_gem_object *obj = NULL;
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struct drm_i915_gem_object *tmp, *next;
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WARN_ON(!mutex_is_locked(&pool->dev->struct_mutex));
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list_for_each_entry_safe(tmp, next,
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&pool->cache_list, batch_pool_list) {
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if (tmp->active)
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continue;
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/* While we're looping, do some clean up */
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if (tmp->madv == __I915_MADV_PURGED) {
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list_del(&tmp->batch_pool_list);
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drm_gem_object_unreference(&tmp->base);
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continue;
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}
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/*
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* Select a buffer that is at least as big as needed
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* but not 'too much' bigger. A better way to do this
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* might be to bucket the pool objects based on size.
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*/
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if (tmp->base.size >= size &&
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tmp->base.size <= (2 * size)) {
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obj = tmp;
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break;
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}
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}
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if (!obj) {
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obj = i915_gem_alloc_object(pool->dev, size);
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if (!obj)
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return ERR_PTR(-ENOMEM);
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list_add_tail(&obj->batch_pool_list, &pool->cache_list);
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}
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else
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/* Keep list in LRU order */
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list_move_tail(&obj->batch_pool_list, &pool->cache_list);
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obj->madv = I915_MADV_WILLNEED;
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return obj;
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}
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