0,0 → 1,277 |
/* |
* Copyright © 2008-2010 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. |
* |
* Authors: |
* Eric Anholt <eric@anholt.net> |
* Chris Wilson <chris@chris-wilson.co.uuk> |
* |
*/ |
|
#include <drm/drmP.h> |
#include <drm/i915_drm.h> |
|
#include "i915_drv.h" |
#include "intel_drv.h" |
#include "i915_trace.h" |
|
static bool |
mark_free(struct i915_vma *vma, struct list_head *unwind) |
{ |
if (vma->pin_count) |
return false; |
|
if (WARN_ON(!list_empty(&vma->exec_list))) |
return false; |
|
list_add(&vma->exec_list, unwind); |
return drm_mm_scan_add_block(&vma->node); |
} |
|
/** |
* i915_gem_evict_something - Evict vmas to make room for binding a new one |
* @dev: drm_device |
* @vm: address space to evict from |
* @size: size of the desired free space |
* @alignment: alignment constraint of the desired free space |
* @cache_level: cache_level for the desired space |
* @mappable: whether the free space must be mappable |
* @nonblocking: whether evicting active objects is allowed or not |
* |
* This function will try to evict vmas until a free space satisfying the |
* requirements is found. Callers must check first whether any such hole exists |
* already before calling this function. |
* |
* This function is used by the object/vma binding code. |
* |
* To clarify: This is for freeing up virtual address space, not for freeing |
* memory in e.g. the shrinker. |
*/ |
int |
i915_gem_evict_something(struct drm_device *dev, struct i915_address_space *vm, |
int min_size, unsigned alignment, unsigned cache_level, |
unsigned long start, unsigned long end, |
unsigned flags) |
{ |
struct list_head eviction_list, unwind_list; |
struct i915_vma *vma; |
int ret = 0; |
int pass = 0; |
|
trace_i915_gem_evict(dev, min_size, alignment, flags); |
|
/* |
* The goal is to evict objects and amalgamate space in LRU order. |
* The oldest idle objects reside on the inactive list, which is in |
* retirement order. The next objects to retire are those on the (per |
* ring) active list that do not have an outstanding flush. Once the |
* hardware reports completion (the seqno is updated after the |
* batchbuffer has been finished) the clean buffer objects would |
* be retired to the inactive list. Any dirty objects would be added |
* to the tail of the flushing list. So after processing the clean |
* active objects we need to emit a MI_FLUSH to retire the flushing |
* list, hence the retirement order of the flushing list is in |
* advance of the dirty objects on the active lists. |
* |
* The retirement sequence is thus: |
* 1. Inactive objects (already retired) |
* 2. Clean active objects |
* 3. Flushing list |
* 4. Dirty active objects. |
* |
* On each list, the oldest objects lie at the HEAD with the freshest |
* object on the TAIL. |
*/ |
|
INIT_LIST_HEAD(&unwind_list); |
if (start != 0 || end != vm->total) { |
drm_mm_init_scan_with_range(&vm->mm, min_size, |
alignment, cache_level, |
start, end); |
} else |
drm_mm_init_scan(&vm->mm, min_size, alignment, cache_level); |
|
search_again: |
/* First see if there is a large enough contiguous idle region... */ |
list_for_each_entry(vma, &vm->inactive_list, mm_list) { |
if (mark_free(vma, &unwind_list)) |
goto found; |
} |
|
if (flags & PIN_NONBLOCK) |
goto none; |
|
/* Now merge in the soon-to-be-expired objects... */ |
list_for_each_entry(vma, &vm->active_list, mm_list) { |
if (mark_free(vma, &unwind_list)) |
goto found; |
} |
|
none: |
/* Nothing found, clean up and bail out! */ |
while (!list_empty(&unwind_list)) { |
vma = list_first_entry(&unwind_list, |
struct i915_vma, |
exec_list); |
ret = drm_mm_scan_remove_block(&vma->node); |
BUG_ON(ret); |
|
list_del_init(&vma->exec_list); |
} |
|
/* Can we unpin some objects such as idle hw contents, |
* or pending flips? |
*/ |
if (flags & PIN_NONBLOCK) |
return -ENOSPC; |
|
/* Only idle the GPU and repeat the search once */ |
if (pass++ == 0) { |
ret = i915_gpu_idle(dev); |
if (ret) |
return ret; |
|
i915_gem_retire_requests(dev); |
goto search_again; |
} |
|
/* If we still have pending pageflip completions, drop |
* back to userspace to give our workqueues time to |
* acquire our locks and unpin the old scanouts. |
*/ |
return intel_has_pending_fb_unpin(dev) ? -EAGAIN : -ENOSPC; |
|
found: |
/* drm_mm doesn't allow any other other operations while |
* scanning, therefore store to be evicted objects on a |
* temporary list. */ |
INIT_LIST_HEAD(&eviction_list); |
while (!list_empty(&unwind_list)) { |
vma = list_first_entry(&unwind_list, |
struct i915_vma, |
exec_list); |
if (drm_mm_scan_remove_block(&vma->node)) { |
list_move(&vma->exec_list, &eviction_list); |
drm_gem_object_reference(&vma->obj->base); |
continue; |
} |
list_del_init(&vma->exec_list); |
} |
|
/* Unbinding will emit any required flushes */ |
while (!list_empty(&eviction_list)) { |
struct drm_gem_object *obj; |
vma = list_first_entry(&eviction_list, |
struct i915_vma, |
exec_list); |
|
obj = &vma->obj->base; |
list_del_init(&vma->exec_list); |
if (ret == 0) |
ret = i915_vma_unbind(vma); |
|
drm_gem_object_unreference(obj); |
} |
|
return ret; |
} |
|
/** |
* i915_gem_evict_vm - Evict all idle vmas from a vm |
* |
* @vm: Address space to cleanse |
* @do_idle: Boolean directing whether to idle first. |
* |
* This function evicts all idles vmas from a vm. If all unpinned vmas should be |
* evicted the @do_idle needs to be set to true. |
* |
* This is used by the execbuf code as a last-ditch effort to defragment the |
* address space. |
* |
* To clarify: This is for freeing up virtual address space, not for freeing |
* memory in e.g. the shrinker. |
*/ |
int i915_gem_evict_vm(struct i915_address_space *vm, bool do_idle) |
{ |
struct i915_vma *vma, *next; |
int ret; |
|
trace_i915_gem_evict_vm(vm); |
|
if (do_idle) { |
ret = i915_gpu_idle(vm->dev); |
if (ret) |
return ret; |
|
i915_gem_retire_requests(vm->dev); |
} |
|
list_for_each_entry_safe(vma, next, &vm->inactive_list, mm_list) |
if (vma->pin_count == 0) |
WARN_ON(i915_vma_unbind(vma)); |
|
return 0; |
} |
|
/** |
* i915_gem_evict_everything - Try to evict all objects |
* @dev: Device to evict objects for |
* |
* This functions tries to evict all gem objects from all address spaces. Used |
* by the shrinker as a last-ditch effort and for suspend, before releasing the |
* backing storage of all unbound objects. |
*/ |
int |
i915_gem_evict_everything(struct drm_device *dev) |
{ |
struct drm_i915_private *dev_priv = dev->dev_private; |
struct i915_address_space *vm; |
bool lists_empty = true; |
int ret; |
|
list_for_each_entry(vm, &dev_priv->vm_list, global_link) { |
lists_empty = (list_empty(&vm->inactive_list) && |
list_empty(&vm->active_list)); |
if (!lists_empty) |
lists_empty = false; |
} |
|
if (lists_empty) |
return -ENOSPC; |
|
trace_i915_gem_evict_everything(dev); |
|
/* The gpu_idle will flush everything in the write domain to the |
* active list. Then we must move everything off the active list |
* with retire requests. |
*/ |
ret = i915_gpu_idle(dev); |
if (ret) |
return ret; |
|
i915_gem_retire_requests(dev); |
|
/* Having flushed everything, unbind() should never raise an error */ |
list_for_each_entry(vm, &dev_priv->vm_list, global_link) |
WARN_ON(i915_gem_evict_vm(vm, false)); |
|
return 0; |
} |