--- /dev/null
+/*
+ * 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
+ * @min_size: size of the desired free space
+ * @alignment: alignment constraint of the desired free space
+ * @cache_level: cache_level for the desired space
+ * @start: start (inclusive) of the range from which to evict objects
+ * @end: end (exclusive) of the range from which to evict objects
+ * @flags: additional flags to control the eviction algorithm
+ *
+ * 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.
+ *
+ * Since this function is only used to free up virtual address space it only
+ * ignores pinned vmas, and not object where the backing storage itself is
+ * pinned. Hence obj->pages_pin_count does not protect against eviction.
+ *
+ * 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;
+
+ WARN_ON(!mutex_is_locked(&vm->dev->struct_mutex));
+ 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);
+
+ WARN_ON(!list_empty(&vm->active_list));
+ }
+
+ 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, *v;
+ 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_safe(vm, v, &dev_priv->vm_list, global_link)
+ WARN_ON(i915_gem_evict_vm(vm, false));
+
+ return 0;
+}
Code Review / kvmfornfv.git / blobdiff