138 lines
4.1 KiB
C
138 lines
4.1 KiB
C
/*
|
|
* Copyright © 2014 Intel Corporation
|
|
*
|
|
* 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, sublicense,
|
|
* 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 NONINFRINGEMENT. IN NO EVENT SHALL
|
|
* THE AUTHORS OR COPYRIGHT HOLDERS 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 "i915_drv.h"
|
|
|
|
/**
|
|
* DOC: batch pool
|
|
*
|
|
* In order to submit batch buffers as 'secure', the software command parser
|
|
* must ensure that a batch buffer cannot be modified after parsing. It does
|
|
* this by copying the user provided batch buffer contents to a kernel owned
|
|
* buffer from which the hardware will actually execute, and by carefully
|
|
* managing the address space bindings for such buffers.
|
|
*
|
|
* The batch pool framework provides a mechanism for the driver to manage a
|
|
* set of scratch buffers to use for this purpose. The framework can be
|
|
* extended to support other uses cases should they arise.
|
|
*/
|
|
|
|
/**
|
|
* i915_gem_batch_pool_init() - initialize a batch buffer pool
|
|
* @dev: the drm device
|
|
* @pool: the batch buffer pool
|
|
*/
|
|
void i915_gem_batch_pool_init(struct drm_device *dev,
|
|
struct i915_gem_batch_pool *pool)
|
|
{
|
|
pool->dev = dev;
|
|
INIT_LIST_HEAD(&pool->cache_list);
|
|
}
|
|
|
|
/**
|
|
* i915_gem_batch_pool_fini() - clean up a batch buffer pool
|
|
* @pool: the pool to clean up
|
|
*
|
|
* Note: Callers must hold the struct_mutex.
|
|
*/
|
|
void i915_gem_batch_pool_fini(struct i915_gem_batch_pool *pool)
|
|
{
|
|
WARN_ON(!mutex_is_locked(&pool->dev->struct_mutex));
|
|
|
|
while (!list_empty(&pool->cache_list)) {
|
|
struct drm_i915_gem_object *obj =
|
|
list_first_entry(&pool->cache_list,
|
|
struct drm_i915_gem_object,
|
|
batch_pool_list);
|
|
|
|
WARN_ON(obj->active);
|
|
|
|
list_del_init(&obj->batch_pool_list);
|
|
drm_gem_object_unreference(&obj->base);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* i915_gem_batch_pool_get() - select a buffer from the pool
|
|
* @pool: the batch buffer pool
|
|
* @size: the minimum desired size of the returned buffer
|
|
*
|
|
* Finds or allocates a batch buffer in the pool with at least the requested
|
|
* size. The caller is responsible for any domain, active/inactive, or
|
|
* purgeability management for the returned buffer.
|
|
*
|
|
* Note: Callers must hold the struct_mutex
|
|
*
|
|
* Return: the selected batch buffer object
|
|
*/
|
|
struct drm_i915_gem_object *
|
|
i915_gem_batch_pool_get(struct i915_gem_batch_pool *pool,
|
|
size_t size)
|
|
{
|
|
struct drm_i915_gem_object *obj = NULL;
|
|
struct drm_i915_gem_object *tmp, *next;
|
|
|
|
WARN_ON(!mutex_is_locked(&pool->dev->struct_mutex));
|
|
|
|
list_for_each_entry_safe(tmp, next,
|
|
&pool->cache_list, batch_pool_list) {
|
|
|
|
if (tmp->active)
|
|
continue;
|
|
|
|
/* While we're looping, do some clean up */
|
|
if (tmp->madv == __I915_MADV_PURGED) {
|
|
list_del(&tmp->batch_pool_list);
|
|
drm_gem_object_unreference(&tmp->base);
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* Select a buffer that is at least as big as needed
|
|
* but not 'too much' bigger. A better way to do this
|
|
* might be to bucket the pool objects based on size.
|
|
*/
|
|
if (tmp->base.size >= size &&
|
|
tmp->base.size <= (2 * size)) {
|
|
obj = tmp;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!obj) {
|
|
obj = i915_gem_alloc_object(pool->dev, size);
|
|
if (!obj)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
list_add_tail(&obj->batch_pool_list, &pool->cache_list);
|
|
}
|
|
else
|
|
/* Keep list in LRU order */
|
|
list_move_tail(&obj->batch_pool_list, &pool->cache_list);
|
|
|
|
obj->madv = I915_MADV_WILLNEED;
|
|
|
|
return obj;
|
|
}
|