--- /dev/null
+/*
+ * Copyright 2019 Collabora, Ltd.
+ *
+ * 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 (Collabora):
+ * Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
+ */
+#include <xf86drm.h>
+#include <pthread.h>
+#include "drm-uapi/panfrost_drm.h"
+
+#include "pan_screen.h"
+#include "util/u_math.h"
+
+/* This file implements a userspace BO cache. Allocating and freeing
+ * GPU-visible buffers is very expensive, and even the extra kernel roundtrips
+ * adds more work than we would like at this point. So caching BOs in userspace
+ * solves both of these problems and does not require kernel updates.
+ *
+ * Cached BOs are sorted into a bucket based on rounding their size down to the
+ * nearest power-of-two. Each bucket contains a linked list of free panfrost_bo
+ * objects. Putting a BO into the cache is accomplished by adding it to the
+ * corresponding bucket. Getting a BO from the cache consists of finding the
+ * appropriate bucket and sorting. A cache eviction is a kernel-level free of a
+ * BO and removing it from the bucket. We special case evicting all BOs from
+ * the cache, since that's what helpful in practice and avoids extra logic
+ * around the linked list.
+ */
+
+/* Helper to calculate the bucket index of a BO */
+
+static unsigned
+pan_bucket_index(unsigned size)
+{
+ /* Round down to POT to compute a bucket index */
+
+ unsigned bucket_index = util_logbase2(size);
+
+ /* Clamp the bucket index; all huge allocations will be
+ * sorted into the largest bucket */
+
+ bucket_index = MIN2(bucket_index, MAX_BO_CACHE_BUCKET);
+
+ /* The minimum bucket size must equal the minimum allocation
+ * size; the maximum we clamped */
+
+ assert(bucket_index >= MIN_BO_CACHE_BUCKET);
+ assert(bucket_index <= MAX_BO_CACHE_BUCKET);
+
+ /* Reindex from 0 */
+ return (bucket_index - MIN_BO_CACHE_BUCKET);
+}
+
+static struct list_head *
+pan_bucket(struct panfrost_screen *screen, unsigned size)
+{
+ return &screen->bo_cache[pan_bucket_index(size)];
+}
+
+/* Tries to fetch a BO of sufficient size with the appropriate flags from the
+ * BO cache. If it succeeds, it returns that BO and removes the BO from the
+ * cache. If it fails, it returns NULL signaling the caller to allocate a new
+ * BO. */
+
+struct panfrost_bo *
+panfrost_bo_cache_fetch(
+ struct panfrost_screen *screen,
+ size_t size, uint32_t flags)
+{
+ pthread_mutex_lock(&screen->bo_cache_lock);
+ struct list_head *bucket = pan_bucket(screen, size);
+ struct panfrost_bo *bo = NULL;
+
+ /* Iterate the bucket looking for something suitable */
+ list_for_each_entry_safe(struct panfrost_bo, entry, bucket, link) {
+ if (entry->size >= size &&
+ entry->flags == flags) {
+ int ret;
+ struct drm_panfrost_madvise madv;
+
+ /* This one works, splice it out of the cache */
+ list_del(&entry->link);
+
+ madv.handle = entry->gem_handle;
+ madv.madv = PANFROST_MADV_WILLNEED;
+ madv.retained = 0;
+
+ ret = drmIoctl(screen->fd, DRM_IOCTL_PANFROST_MADVISE, &madv);
+ if (!ret && !madv.retained) {
+ panfrost_drm_release_bo(screen, entry, false);
+ continue;
+ }
+ /* Let's go! */
+ bo = entry;
+ break;
+ }
+ }
+ pthread_mutex_unlock(&screen->bo_cache_lock);
+
+ return bo;
+}
+
+/* Tries to add a BO to the cache. Returns if it was
+ * successful */
+
+bool
+panfrost_bo_cache_put(
+ struct panfrost_screen *screen,
+ struct panfrost_bo *bo)
+{
+ pthread_mutex_lock(&screen->bo_cache_lock);
+ struct list_head *bucket = pan_bucket(screen, bo->size);
+ struct drm_panfrost_madvise madv;
+
+ madv.handle = bo->gem_handle;
+ madv.madv = PANFROST_MADV_DONTNEED;
+ madv.retained = 0;
+
+ drmIoctl(screen->fd, DRM_IOCTL_PANFROST_MADVISE, &madv);
+
+ /* Add us to the bucket */
+ list_addtail(&bo->link, bucket);
+ pthread_mutex_unlock(&screen->bo_cache_lock);
+
+ return true;
+}
+
+/* Evicts all BOs from the cache. Called during context
+ * destroy or during low-memory situations (to free up
+ * memory that may be unused by us just sitting in our
+ * cache, but still reserved from the perspective of the
+ * OS) */
+
+void
+panfrost_bo_cache_evict_all(
+ struct panfrost_screen *screen)
+{
+ pthread_mutex_lock(&screen->bo_cache_lock);
+ for (unsigned i = 0; i < ARRAY_SIZE(screen->bo_cache); ++i) {
+ struct list_head *bucket = &screen->bo_cache[i];
+
+ list_for_each_entry_safe(struct panfrost_bo, entry, bucket, link) {
+ list_del(&entry->link);
+ panfrost_drm_release_bo(screen, entry, false);
+ }
+ }
+ pthread_mutex_unlock(&screen->bo_cache_lock);
+}
+
+++ /dev/null
-/*
- * Copyright 2019 Collabora, Ltd.
- *
- * 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 (Collabora):
- * Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
- */
-#include <xf86drm.h>
-#include <pthread.h>
-#include "drm-uapi/panfrost_drm.h"
-
-#include "pan_screen.h"
-#include "util/u_math.h"
-
-/* This file implements a userspace BO cache. Allocating and freeing
- * GPU-visible buffers is very expensive, and even the extra kernel roundtrips
- * adds more work than we would like at this point. So caching BOs in userspace
- * solves both of these problems and does not require kernel updates.
- *
- * Cached BOs are sorted into a bucket based on rounding their size down to the
- * nearest power-of-two. Each bucket contains a linked list of free panfrost_bo
- * objects. Putting a BO into the cache is accomplished by adding it to the
- * corresponding bucket. Getting a BO from the cache consists of finding the
- * appropriate bucket and sorting. A cache eviction is a kernel-level free of a
- * BO and removing it from the bucket. We special case evicting all BOs from
- * the cache, since that's what helpful in practice and avoids extra logic
- * around the linked list.
- */
-
-/* Helper to calculate the bucket index of a BO */
-
-static unsigned
-pan_bucket_index(unsigned size)
-{
- /* Round down to POT to compute a bucket index */
-
- unsigned bucket_index = util_logbase2(size);
-
- /* Clamp the bucket index; all huge allocations will be
- * sorted into the largest bucket */
-
- bucket_index = MIN2(bucket_index, MAX_BO_CACHE_BUCKET);
-
- /* The minimum bucket size must equal the minimum allocation
- * size; the maximum we clamped */
-
- assert(bucket_index >= MIN_BO_CACHE_BUCKET);
- assert(bucket_index <= MAX_BO_CACHE_BUCKET);
-
- /* Reindex from 0 */
- return (bucket_index - MIN_BO_CACHE_BUCKET);
-}
-
-static struct list_head *
-pan_bucket(struct panfrost_screen *screen, unsigned size)
-{
- return &screen->bo_cache[pan_bucket_index(size)];
-}
-
-/* Tries to fetch a BO of sufficient size with the appropriate flags from the
- * BO cache. If it succeeds, it returns that BO and removes the BO from the
- * cache. If it fails, it returns NULL signaling the caller to allocate a new
- * BO. */
-
-struct panfrost_bo *
-panfrost_bo_cache_fetch(
- struct panfrost_screen *screen,
- size_t size, uint32_t flags)
-{
- pthread_mutex_lock(&screen->bo_cache_lock);
- struct list_head *bucket = pan_bucket(screen, size);
- struct panfrost_bo *bo = NULL;
-
- /* Iterate the bucket looking for something suitable */
- list_for_each_entry_safe(struct panfrost_bo, entry, bucket, link) {
- if (entry->size >= size &&
- entry->flags == flags) {
- int ret;
- struct drm_panfrost_madvise madv;
-
- /* This one works, splice it out of the cache */
- list_del(&entry->link);
-
- madv.handle = entry->gem_handle;
- madv.madv = PANFROST_MADV_WILLNEED;
- madv.retained = 0;
-
- ret = drmIoctl(screen->fd, DRM_IOCTL_PANFROST_MADVISE, &madv);
- if (!ret && !madv.retained) {
- panfrost_drm_release_bo(screen, entry, false);
- continue;
- }
- /* Let's go! */
- bo = entry;
- break;
- }
- }
- pthread_mutex_unlock(&screen->bo_cache_lock);
-
- return bo;
-}
-
-/* Tries to add a BO to the cache. Returns if it was
- * successful */
-
-bool
-panfrost_bo_cache_put(
- struct panfrost_screen *screen,
- struct panfrost_bo *bo)
-{
- pthread_mutex_lock(&screen->bo_cache_lock);
- struct list_head *bucket = pan_bucket(screen, bo->size);
- struct drm_panfrost_madvise madv;
-
- madv.handle = bo->gem_handle;
- madv.madv = PANFROST_MADV_DONTNEED;
- madv.retained = 0;
-
- drmIoctl(screen->fd, DRM_IOCTL_PANFROST_MADVISE, &madv);
-
- /* Add us to the bucket */
- list_addtail(&bo->link, bucket);
- pthread_mutex_unlock(&screen->bo_cache_lock);
-
- return true;
-}
-
-/* Evicts all BOs from the cache. Called during context
- * destroy or during low-memory situations (to free up
- * memory that may be unused by us just sitting in our
- * cache, but still reserved from the perspective of the
- * OS) */
-
-void
-panfrost_bo_cache_evict_all(
- struct panfrost_screen *screen)
-{
- pthread_mutex_lock(&screen->bo_cache_lock);
- for (unsigned i = 0; i < ARRAY_SIZE(screen->bo_cache); ++i) {
- struct list_head *bucket = &screen->bo_cache[i];
-
- list_for_each_entry_safe(struct panfrost_bo, entry, bucket, link) {
- list_del(&entry->link);
- panfrost_drm_release_bo(screen, entry, false);
- }
- }
- pthread_mutex_unlock(&screen->bo_cache_lock);
-}
-
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