---
drivers/gpu/drm/drm_gem_shmem_helper.c | 540 ++++++++++++++++--
.../gpu/drm/panfrost/panfrost_gem_shrinker.c | 9 +-
drivers/gpu/drm/virtio/virtgpu_drv.h | 3 +
include/drm/drm_device.h | 4 +
include/drm/drm_gem_shmem_helper.h | 87 ++-
5 files changed, 594 insertions(+), 49 deletions(-)
diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c
index 555fe212bd98..4cd0b5913492 100644
--- a/drivers/gpu/drm/drm_gem_shmem_helper.c
+++ b/drivers/gpu/drm/drm_gem_shmem_helper.c
@@ -126,6 +126,42 @@ struct drm_gem_shmem_object *drm_gem_shmem_create(struct drm_device *dev, size_t
}
EXPORT_SYMBOL_GPL(drm_gem_shmem_create);
+static bool drm_gem_shmem_is_evictable(struct drm_gem_shmem_object *shmem)
+{
+ return (shmem->madv >= 0) && shmem->evict &&
+ shmem->eviction_enabled && shmem->pages_use_count &&
+ !shmem->pages_pin_count && !shmem->base.dma_buf &&
+ !shmem->base.import_attach && shmem->sgt && !shmem->evicted;
+}
+
+static void
+drm_gem_shmem_update_pages_state(struct drm_gem_shmem_object *shmem)
+{
+ struct drm_gem_object *obj = &shmem->base;
+ struct drm_gem_shmem_shrinker *gem_shrinker = obj->dev->shmem_shrinker;
+
+ dma_resv_assert_held(shmem->base.resv);
+
+ if (!gem_shrinker || obj->import_attach)
+ return;
+
+ mutex_lock(&gem_shrinker->lock);
+
+ if (drm_gem_shmem_is_evictable(shmem) ||
+ drm_gem_shmem_is_purgeable(shmem))
+ list_move_tail(&shmem->madv_list, &gem_shrinker->lru_evictable);
+ else if (shmem->madv < 0)
+ list_del_init(&shmem->madv_list);
+ else if (shmem->evicted)
+ list_move_tail(&shmem->madv_list, &gem_shrinker->lru_evicted);
+ else if (!shmem->pages)
+ list_del_init(&shmem->madv_list);
+ else
+ list_move_tail(&shmem->madv_list, &gem_shrinker->lru_pinned);
+
+ mutex_unlock(&gem_shrinker->lock);
+}
+
/**
* drm_gem_shmem_free - Free resources associated with a shmem GEM object
* @shmem: shmem GEM object to free
@@ -142,6 +178,9 @@ void drm_gem_shmem_free(struct drm_gem_shmem_object *shmem)
} else {
dma_resv_lock(shmem->base.resv, NULL);
+ /* take out shmem GEM object from the memory shrinker */
+ drm_gem_shmem_madvise(shmem, -1);
+
WARN_ON(shmem->vmap_use_count);
if (shmem->sgt) {
@@ -150,7 +189,7 @@ void drm_gem_shmem_free(struct drm_gem_shmem_object *shmem)
sg_free_table(shmem->sgt);
kfree(shmem->sgt);
}
- if (shmem->pages)
+ if (shmem->pages_use_count)
drm_gem_shmem_put_pages(shmem);
WARN_ON(shmem->pages_use_count);
@@ -163,18 +202,82 @@ void drm_gem_shmem_free(struct drm_gem_shmem_object *shmem)
}
EXPORT_SYMBOL_GPL(drm_gem_shmem_free);
-static int drm_gem_shmem_get_pages(struct drm_gem_shmem_object *shmem)
+/**
+ * drm_gem_shmem_set_evictable() - Make GEM evictable by memory shrinker
+ * @shmem: shmem GEM object
+ *
+ * Tell memory shrinker that this GEM can be evicted. Initially eviction is
+ * disabled for all GEMs. If GEM was purged, then -ENOMEM is returned.
+ *
+ * Returns:
+ * 0 on success or a negative error code on failure.
+ */
+int drm_gem_shmem_set_evictable(struct drm_gem_shmem_object *shmem)
+{
+ dma_resv_lock(shmem->base.resv, NULL);
+
+ if (shmem->madv < 0)
+ return -ENOMEM;
+
+ shmem->eviction_enabled = true;
+
+ dma_resv_unlock(shmem->base.resv);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(drm_gem_shmem_set_evictable);
+
+/**
+ * drm_gem_shmem_set_purgeable() - Make GEM purgeable by memory shrinker
+ * @shmem: shmem GEM object
+ *
+ * Tell memory shrinker that this GEM can be purged. Initially purging is
+ * disabled for all GEMs. If GEM was purged, then -ENOMEM is returned.
+ *
+ * Returns:
+ * 0 on success or a negative error code on failure.
+ */
+int drm_gem_shmem_set_purgeable(struct drm_gem_shmem_object *shmem)
+{
+ dma_resv_lock(shmem->base.resv, NULL);
+
+ if (shmem->madv < 0)
+ return -ENOMEM;
+
+ shmem->purge_enabled = true;
+
+ drm_gem_shmem_update_pages_state(shmem);
+
+ dma_resv_unlock(shmem->base.resv);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(drm_gem_shmem_set_purgeable);
+
+static int
+drm_gem_shmem_acquire_pages(struct drm_gem_shmem_object *shmem)
{
struct drm_gem_object *obj = &shmem->base;
struct page **pages;
- if (shmem->pages_use_count++ > 0)
+ dma_resv_assert_held(shmem->base.resv);
+
+ if (shmem->madv < 0) {
+ WARN_ON(shmem->pages);
+ return -ENOMEM;
+ }
+
+ if (shmem->pages) {
+ WARN_ON(!shmem->evicted);
return 0;
+ }
+
+ if (WARN_ON(!shmem->pages_use_count))
+ return -EINVAL;
pages = drm_gem_get_pages(obj);
if (IS_ERR(pages)) {
DRM_DEBUG_KMS("Failed to get pages (%ld)\n", PTR_ERR(pages));
- shmem->pages_use_count = 0;
return PTR_ERR(pages);
}
@@ -193,6 +296,58 @@ static int drm_gem_shmem_get_pages(struct drm_gem_shmem_object *shmem)
return 0;
}
+static int drm_gem_shmem_get_pages(struct drm_gem_shmem_object *shmem)
+{
+ int err;
+
+ dma_resv_assert_held(shmem->base.resv);
+
+ if (shmem->madv < 0)
+ return -ENOMEM;
+
+ if (shmem->pages_use_count++ > 0) {
+ err = drm_gem_shmem_swap_in(shmem);
+ if (err)
+ goto err_zero_use;
+
+ return 0;
+ }
+
+ err = drm_gem_shmem_acquire_pages(shmem);
+ if (err)
+ goto err_zero_use;
+
+ drm_gem_shmem_update_pages_state(shmem);
+
+ return 0;
+
+err_zero_use:
+ shmem->pages_use_count = 0;
+
+ return err;
+}
+
+static void
+drm_gem_shmem_release_pages(struct drm_gem_shmem_object *shmem)
+{
+ struct drm_gem_object *obj = &shmem->base;
+
+ if (!shmem->pages) {
+ WARN_ON(!shmem->evicted && shmem->madv >= 0);
+ return;
+ }
+
+#ifdef CONFIG_X86
+ if (shmem->map_wc)
+ set_pages_array_wb(shmem->pages, obj->size >> PAGE_SHIFT);
+#endif
+
+ drm_gem_put_pages(obj, shmem->pages,
+ shmem->pages_mark_dirty_on_put,
+ shmem->pages_mark_accessed_on_put);
+ shmem->pages = NULL;
+}
+
/*
* drm_gem_shmem_put_pages - Decrease use count on the backing pages for a shmem GEM object
* @shmem: shmem GEM object
@@ -201,8 +356,6 @@ static int drm_gem_shmem_get_pages(struct drm_gem_shmem_object *shmem)
*/
void drm_gem_shmem_put_pages(struct drm_gem_shmem_object *shmem)
{
- struct drm_gem_object *obj = &shmem->base;
-
dma_resv_assert_held(shmem->base.resv);
if (WARN_ON_ONCE(!shmem->pages_use_count))
@@ -211,15 +364,9 @@ void drm_gem_shmem_put_pages(struct drm_gem_shmem_object *shmem)
if (--shmem->pages_use_count > 0)
return;
-#ifdef CONFIG_X86
- if (shmem->map_wc)
- set_pages_array_wb(shmem->pages, obj->size >> PAGE_SHIFT);
-#endif
+ drm_gem_shmem_release_pages(shmem);
- drm_gem_put_pages(obj, shmem->pages,
- shmem->pages_mark_dirty_on_put,
- shmem->pages_mark_accessed_on_put);
- shmem->pages = NULL;
+ drm_gem_shmem_update_pages_state(shmem);
}
EXPORT_SYMBOL(drm_gem_shmem_put_pages);
@@ -235,11 +382,17 @@ EXPORT_SYMBOL(drm_gem_shmem_put_pages);
*/
int drm_gem_shmem_pin(struct drm_gem_shmem_object *shmem)
{
+ int ret;
+
dma_resv_assert_held(shmem->base.resv);
WARN_ON(shmem->base.import_attach);
- return drm_gem_shmem_get_pages(shmem);
+ ret = drm_gem_shmem_get_pages(shmem);
+ if (!ret)
+ shmem->pages_pin_count++;
+
+ return ret;
}
EXPORT_SYMBOL(drm_gem_shmem_pin);
@@ -257,6 +410,8 @@ void drm_gem_shmem_unpin(struct drm_gem_shmem_object *shmem)
WARN_ON(shmem->base.import_attach);
drm_gem_shmem_put_pages(shmem);
+
+ shmem->pages_pin_count--;
}
EXPORT_SYMBOL(drm_gem_shmem_unpin);
@@ -299,7 +454,7 @@ int drm_gem_shmem_vmap(struct drm_gem_shmem_object *shmem,
return 0;
}
- ret = drm_gem_shmem_get_pages(shmem);
+ ret = drm_gem_shmem_pin(shmem);
if (ret)
goto err_zero_use;
@@ -322,7 +477,7 @@ int drm_gem_shmem_vmap(struct drm_gem_shmem_object *shmem,
err_put_pages:
if (!obj->import_attach)
- drm_gem_shmem_put_pages(shmem);
+ drm_gem_shmem_unpin(shmem);
err_zero_use:
shmem->vmap_use_count = 0;
@@ -359,7 +514,7 @@ void drm_gem_shmem_vunmap(struct drm_gem_shmem_object *shmem,
return;
vunmap(shmem->vaddr);
- drm_gem_shmem_put_pages(shmem);
+ drm_gem_shmem_unpin(shmem);
}
shmem->vaddr = NULL;
@@ -403,41 +558,77 @@ int drm_gem_shmem_madvise(struct drm_gem_shmem_object *shmem, int madv)
madv = shmem->madv;
+ drm_gem_shmem_update_pages_state(shmem);
+
return (madv >= 0);
}
EXPORT_SYMBOL(drm_gem_shmem_madvise);
-void drm_gem_shmem_purge(struct drm_gem_shmem_object *shmem)
+/**
+ * drm_gem_shmem_swap_in() - Moves shmem GEM back to memory and enables
+ * hardware access to the memory.
+ * @shmem: shmem GEM object
+ *
+ * This function moves shmem GEM back to memory if it was previously evicted
+ * by the memory shrinker. The GEM is ready to use on success.
+ *
+ * Returns:
+ * 0 on success or a negative error code on failure.
+ */
+int drm_gem_shmem_swap_in(struct drm_gem_shmem_object *shmem)
{
struct drm_gem_object *obj = &shmem->base;
- struct drm_device *dev = obj->dev;
+ struct sg_table *sgt;
+ int err;
dma_resv_assert_held(shmem->base.resv);
- WARN_ON(!drm_gem_shmem_is_purgeable(shmem));
+ if (shmem->evicted) {
+ err = drm_gem_shmem_acquire_pages(shmem);
+ if (err)
+ return err;
+
+ sgt = drm_gem_shmem_get_sg_table(shmem);
+ if (IS_ERR(sgt))
+ return PTR_ERR(sgt);
+
+ err = dma_map_sgtable(obj->dev->dev, sgt,
+ DMA_BIDIRECTIONAL, 0);
+ if (err) {
+ sg_free_table(sgt);
+ kfree(sgt);
+ return err;
+ }
- dma_unmap_sgtable(dev->dev, shmem->sgt, DMA_BIDIRECTIONAL, 0);
- sg_free_table(shmem->sgt);
- kfree(shmem->sgt);
- shmem->sgt = NULL;
+ shmem->sgt = sgt;
+ shmem->evicted = false;
- drm_gem_shmem_put_pages(shmem);
+ drm_gem_shmem_update_pages_state(shmem);
+ }
- shmem->madv = -1;
+ if (!shmem->pages)
+ return -ENOMEM;
- drm_vma_node_unmap(&obj->vma_node, dev->anon_inode->i_mapping);
- drm_gem_free_mmap_offset(obj);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(drm_gem_shmem_swap_in);
- /* Our goal here is to return as much of the memory as
- * is possible back to the system as we are called from OOM.
- * To do this we must instruct the shmfs to drop all of its
- * backing pages, *now*.
- */
- shmem_truncate_range(file_inode(obj->filp), 0, (loff_t)-1);
+static void drm_gem_shmem_unpin_pages(struct drm_gem_shmem_object *shmem)
+{
+ struct drm_gem_object *obj = &shmem->base;
+ struct drm_device *dev = obj->dev;
- invalidate_mapping_pages(file_inode(obj->filp)->i_mapping, 0, (loff_t)-1);
+ if (shmem->evicted)
+ return;
+
+ dma_unmap_sgtable(dev->dev, shmem->sgt, DMA_BIDIRECTIONAL, 0);
+ drm_gem_shmem_release_pages(shmem);
+ drm_vma_node_unmap(&obj->vma_node, dev->anon_inode->i_mapping);
+
+ sg_free_table(shmem->sgt);
+ kfree(shmem->sgt);
+ shmem->sgt = NULL;
}
-EXPORT_SYMBOL(drm_gem_shmem_purge);
/**
* drm_gem_shmem_dumb_create - Create a dumb shmem buffer object
@@ -488,22 +679,33 @@ static vm_fault_t drm_gem_shmem_fault(struct vm_fault *vmf)
vm_fault_t ret;
struct page *page;
pgoff_t page_offset;
+ bool pages_unpinned;
+ int err;
/* We don't use vmf->pgoff since that has the fake offset */
page_offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
dma_resv_lock(shmem->base.resv, NULL);
- if (page_offset >= num_pages ||
- WARN_ON_ONCE(!shmem->pages) ||
- shmem->madv < 0) {
+ /* Sanity-check that we have the pages pointer when it should present */
+ pages_unpinned = (shmem->evicted || shmem->madv < 0 || !shmem->pages_use_count);
+ WARN_ON_ONCE(!shmem->pages ^ pages_unpinned);
+
+ if (page_offset >= num_pages || (!shmem->pages && !shmem->evicted)) {
ret = VM_FAULT_SIGBUS;
} else {
+ err = drm_gem_shmem_swap_in(shmem);
+ if (err) {
+ ret = VM_FAULT_OOM;
+ goto unlock;
+ }
+
page = shmem->pages[page_offset];
ret = vmf_insert_pfn(vma, vmf->address, page_to_pfn(page));
}
+unlock:
dma_resv_unlock(shmem->base.resv);
return ret;
@@ -513,13 +715,15 @@ static void drm_gem_shmem_vm_open(struct vm_area_struct *vma)
{
struct drm_gem_object *obj = vma->vm_private_data;
struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
- int ret;
WARN_ON(shmem->base.import_attach);
dma_resv_lock(shmem->base.resv, NULL);
- ret = drm_gem_shmem_get_pages(shmem);
- WARN_ON_ONCE(ret != 0);
+
+ if (drm_gem_shmem_get_pages(shmem))
+ shmem->pages_use_count++;
+
+ drm_gem_shmem_update_pages_state(shmem);
dma_resv_unlock(shmem->base.resv);
drm_gem_vm_open(vma);
@@ -583,6 +787,8 @@ EXPORT_SYMBOL_GPL(drm_gem_shmem_mmap);
void drm_gem_shmem_print_info(const struct drm_gem_shmem_object *shmem,
struct drm_printer *p, unsigned int indent)
{
+ drm_printf_indent(p, indent, "eviction_enabled=%d\n", shmem->eviction_enabled);
+ drm_printf_indent(p, indent, "purge_enabled=%d\n", shmem->purge_enabled);
drm_printf_indent(p, indent, "pages_use_count=%u\n", shmem->pages_use_count);
if (shmem->base.import_attach)
@@ -592,7 +798,9 @@ void drm_gem_shmem_print_info(const struct drm_gem_shmem_object *shmem,
drm_printf_indent(p, indent, "vmap_use_count=%u\n",
shmem->vmap_use_count);
+ drm_printf_indent(p, indent, "evicted=%d\n", shmem->evicted);
drm_printf_indent(p, indent, "vaddr=%p\n", shmem->vaddr);
+ drm_printf_indent(p, indent, "madv=%d\n", shmem->madv);
}
EXPORT_SYMBOL(drm_gem_shmem_print_info);
@@ -667,6 +875,8 @@ struct sg_table *drm_gem_shmem_get_pages_sgt(struct drm_gem_shmem_object *shmem)
shmem->sgt = sgt;
+ drm_gem_shmem_update_pages_state(shmem);
+
dma_resv_unlock(shmem->base.resv);
return sgt;
@@ -717,6 +927,250 @@ drm_gem_shmem_prime_import_sg_table(struct drm_device *dev,
}
EXPORT_SYMBOL_GPL(drm_gem_shmem_prime_import_sg_table);
+static struct drm_gem_shmem_shrinker *
+to_drm_shrinker(struct shrinker *shrinker)
+{
+ return container_of(shrinker, struct drm_gem_shmem_shrinker, base);
+}
+
+static unsigned long
+drm_gem_shmem_shrinker_count_objects(struct shrinker *shrinker,
+ struct shrink_control *sc)
+{
+ struct drm_gem_shmem_shrinker *gem_shrinker = to_drm_shrinker(shrinker);
+ struct drm_gem_shmem_object *shmem;
+ unsigned long count = 0;
+
+ if (!mutex_trylock(&gem_shrinker->lock))
+ return 0;
+
+ list_for_each_entry(shmem, &gem_shrinker->lru_evictable, madv_list) {
+ count += shmem->base.size;
+
+ if (count >= SHRINK_EMPTY)
+ break;
+ }
+
+ mutex_unlock(&gem_shrinker->lock);
+
+ if (count >= SHRINK_EMPTY)
+ return SHRINK_EMPTY - 1;
+
+ return count ?: SHRINK_EMPTY;
+}
+
+int drm_gem_shmem_evict(struct drm_gem_shmem_object *shmem)
+{
+ WARN_ON(!drm_gem_shmem_is_evictable(shmem));
+ WARN_ON(shmem->evicted);
+
+ drm_gem_shmem_unpin_pages(shmem);
+
+ shmem->evicted = true;
+ drm_gem_shmem_update_pages_state(shmem);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(drm_gem_shmem_evict);
+
+int drm_gem_shmem_purge(struct drm_gem_shmem_object *shmem)
+{
+ struct drm_gem_object *obj = &shmem->base;
+
+ WARN_ON(!drm_gem_shmem_is_purgeable(shmem));
+
+ drm_gem_shmem_unpin_pages(shmem);
+ drm_gem_free_mmap_offset(obj);
+
+ /* Our goal here is to return as much of the memory as
+ * is possible back to the system as we are called from OOM.
+ * To do this we must instruct the shmfs to drop all of its
+ * backing pages, *now*.
+ */
+ shmem_truncate_range(file_inode(obj->filp), 0, (loff_t)-1);
+
+ invalidate_mapping_pages(file_inode(obj->filp)->i_mapping, 0, (loff_t)-1);
+
+ shmem->madv = -1;
+ shmem->evicted = false;
+ drm_gem_shmem_update_pages_state(shmem);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(drm_gem_shmem_purge);
+
+static unsigned long
+drm_gem_shmem_shrinker_run_objects_scan(struct shrinker *shrinker,
+ unsigned long nr_to_scan,
+ bool *lock_contention,
+ bool evict)
+{
+ struct drm_gem_shmem_shrinker *gem_shrinker = to_drm_shrinker(shrinker);
+ struct drm_gem_shmem_object *shmem;
+ struct list_head still_in_list;
+ struct drm_gem_object *obj;
+ unsigned long freed = 0;
+ size_t page_count;
+ int err;
+
+ INIT_LIST_HEAD(&still_in_list);
+
+ mutex_lock(&gem_shrinker->lock);
+
+ while (freed < nr_to_scan) {
+ shmem = list_first_entry_or_null(&gem_shrinker->lru_evictable,
+ typeof(*shmem), madv_list);
+ if (!shmem)
+ break;
+
+ obj = &shmem->base;
+ page_count = obj->size >> PAGE_SHIFT;
+ list_move_tail(&shmem->madv_list, &still_in_list);
+
+ if (evict) {
+ if (!drm_gem_shmem_is_evictable(shmem) ||
+ get_nr_swap_pages() < page_count)
+ continue;
+ } else {
+ if (!drm_gem_shmem_is_purgeable(shmem))
+ continue;
+ }
+
+ /*
+ * If it's in the process of being freed, gem_object->free()
+ * may be blocked on lock waiting to remove it. So just
+ * skip it.
+ */
+ if (!kref_get_unless_zero(&obj->refcount))
+ continue;
+
+ mutex_unlock(&gem_shrinker->lock);
+
+ /* prevent racing with job-submission code paths */
+ if (!dma_resv_trylock(obj->resv)) {
+ *lock_contention |= true;
+ goto shrinker_lock;
+ }
+
+ /* prevent racing with the dma-buf importing/exporting */
+ if (!mutex_trylock(&gem_shrinker->dev->object_name_lock)) {
+ *lock_contention |= true;
+ goto resv_unlock;
+ }
+
+ /* check whether h/w uses this object */
+ if (!dma_resv_test_signaled(obj->resv, DMA_RESV_USAGE_WRITE))
+ goto object_name_unlock;
+
+ /* re-check whether eviction status hasn't changed */
+ if (!drm_gem_shmem_is_evictable(shmem) &&
+ !drm_gem_shmem_is_purgeable(shmem))
+ goto object_name_unlock;
+
+ err = shmem->evict(shmem);
+ if (!err)
+ freed += obj->size >> PAGE_SHIFT;
+
+object_name_unlock:
+ mutex_unlock(&gem_shrinker->dev->object_name_lock);
+resv_unlock:
+ dma_resv_unlock(obj->resv);
+shrinker_lock:
+ drm_gem_object_put(&shmem->base);
+ mutex_lock(&gem_shrinker->lock);
+ }
+
+ list_splice_tail(&still_in_list, &gem_shrinker->lru_evictable);
+
+ mutex_unlock(&gem_shrinker->lock);
+
+ return freed;
+}
+
+static unsigned long
+drm_gem_shmem_shrinker_scan_objects(struct shrinker *shrinker,
+ struct shrink_control *sc)
+{
+ unsigned long nr_to_scan = sc->nr_to_scan;
+ bool lock_contention = false;
+ unsigned long freed;
+
+ /* purge as many objects as we can */
+ freed = drm_gem_shmem_shrinker_run_objects_scan(shrinker, nr_to_scan,
+ &lock_contention, false);
+
+ /* evict as many objects as we can */
+ if (freed < nr_to_scan)
+ freed += drm_gem_shmem_shrinker_run_objects_scan(shrinker,
+ nr_to_scan - freed,
+ &lock_contention,
+ true);
+
+ return (!freed && !lock_contention) ? SHRINK_STOP : freed;
+}
+
+/**
+ * drm_gem_shmem_shrinker_register() - Register shmem shrinker
+ * @dev: DRM device
+ *
+ * Returns:
+ * 0 on success or a negative error code on failure.
+ */
+int drm_gem_shmem_shrinker_register(struct drm_device *dev)
+{
+ struct drm_gem_shmem_shrinker *gem_shrinker;
+ int err;
+
+ if (WARN_ON(dev->shmem_shrinker))
+ return -EBUSY;
+
+ gem_shrinker = kzalloc(sizeof(*gem_shrinker), GFP_KERNEL);
+ if (!gem_shrinker)
+ return -ENOMEM;
+
+ gem_shrinker->base.count_objects = drm_gem_shmem_shrinker_count_objects;
+ gem_shrinker->base.scan_objects = drm_gem_shmem_shrinker_scan_objects;
+ gem_shrinker->base.seeks = DEFAULT_SEEKS;
+ gem_shrinker->dev = dev;
+
+ INIT_LIST_HEAD(&gem_shrinker->lru_evictable);
+ INIT_LIST_HEAD(&gem_shrinker->lru_evicted);
+ INIT_LIST_HEAD(&gem_shrinker->lru_pinned);
+ mutex_init(&gem_shrinker->lock);
+
+ dev->shmem_shrinker = gem_shrinker;
+
+ err = register_shrinker(&gem_shrinker->base);
+ if (err) {
+ dev->shmem_shrinker = NULL;
+ kfree(gem_shrinker);
+ return err;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(drm_gem_shmem_shrinker_register);
+
+/**
+ * drm_gem_shmem_shrinker_unregister() - Unregister shmem shrinker
+ * @dev: DRM device
+ */
+void drm_gem_shmem_shrinker_unregister(struct drm_device *dev)
+{
+ struct drm_gem_shmem_shrinker *gem_shrinker = dev->shmem_shrinker;
+
+ if (gem_shrinker) {
+ unregister_shrinker(&gem_shrinker->base);
+ WARN_ON(!list_empty(&gem_shrinker->lru_evictable));
+ WARN_ON(!list_empty(&gem_shrinker->lru_evicted));
+ WARN_ON(!list_empty(&gem_shrinker->lru_pinned));
+ mutex_destroy(&gem_shrinker->lock);
+ dev->shmem_shrinker = NULL;
+ kfree(gem_shrinker);
+ }
+}
+EXPORT_SYMBOL_GPL(drm_gem_shmem_shrinker_unregister);
+
MODULE_DESCRIPTION("DRM SHMEM memory-management helpers");
MODULE_IMPORT_NS(DMA_BUF);
MODULE_LICENSE("GPL v2");
diff --git a/drivers/gpu/drm/panfrost/panfrost_gem_shrinker.c b/drivers/gpu/drm/panfrost/panfrost_gem_shrinker.c
index a4bedfeb2ec4..7cc32556f908 100644
--- a/drivers/gpu/drm/panfrost/panfrost_gem_shrinker.c
+++ b/drivers/gpu/drm/panfrost/panfrost_gem_shrinker.c
@@ -15,6 +15,13 @@
#include "panfrost_gem.h"
#include "panfrost_mmu.h"
+static bool panfrost_gem_shmem_is_purgeable(struct drm_gem_shmem_object *shmem)
+{
+ return (shmem->madv > 0) &&
+ !shmem->pages_pin_count && shmem->sgt &&
+ !shmem->base.dma_buf && !shmem->base.import_attach;
+}
+
static unsigned long
panfrost_gem_shrinker_count(struct shrinker *shrinker, struct shrink_control *sc)
{
@@ -27,7 +34,7 @@ panfrost_gem_shrinker_count(struct shrinker *shrinker, struct shrink_control *sc
return 0;
list_for_each_entry(shmem, &pfdev->shrinker_list, madv_list) {
- if (drm_gem_shmem_is_purgeable(shmem))
+ if (panfrost_gem_shmem_is_purgeable(shmem))
count += shmem->base.size >> PAGE_SHIFT;
}
diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h b/drivers/gpu/drm/virtio/virtgpu_drv.h
index b2d93cb12ebf..81bacc7e1873 100644
--- a/drivers/gpu/drm/virtio/virtgpu_drv.h
+++ b/drivers/gpu/drm/virtio/virtgpu_drv.h
@@ -89,6 +89,7 @@ struct virtio_gpu_object {
uint32_t hw_res_handle;
bool dumb;
bool created;
+ bool detached;
bool host3d_blob, guest_blob;
uint32_t blob_mem, blob_flags;
@@ -453,6 +454,8 @@ int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
bool virtio_gpu_is_shmem(struct virtio_gpu_object *bo);
+int virtio_gpu_reattach_shmem_object(struct virtio_gpu_object *bo);
+
int virtio_gpu_resource_id_get(struct virtio_gpu_device *vgdev,
uint32_t *resid);
/* virtgpu_prime.c */
diff --git a/include/drm/drm_device.h b/include/drm/drm_device.h
index 9923c7a6885e..929546cad894 100644
--- a/include/drm/drm_device.h
+++ b/include/drm/drm_device.h
@@ -16,6 +16,7 @@ struct drm_vblank_crtc;
struct drm_vma_offset_manager;
struct drm_vram_mm;
struct drm_fb_helper;
+struct drm_gem_shmem_shrinker;
struct inode;
@@ -277,6 +278,9 @@ struct drm_device {
/** @vram_mm: VRAM MM memory manager */
struct drm_vram_mm *vram_mm;
+ /** @shmem_shrinker: SHMEM GEM memory shrinker */
+ struct drm_gem_shmem_shrinker *shmem_shrinker;
+
/**
* @switch_power_state:
*
diff --git a/include/drm/drm_gem_shmem_helper.h b/include/drm/drm_gem_shmem_helper.h
index 9a8983ee8abe..62c640678a91 100644
--- a/include/drm/drm_gem_shmem_helper.h
+++ b/include/drm/drm_gem_shmem_helper.h
@@ -6,6 +6,7 @@
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/mutex.h>
+#include <linux/shrinker.h>
#include <drm/drm_file.h>
#include <drm/drm_gem.h>
@@ -15,6 +16,7 @@
struct dma_buf_attachment;
struct drm_mode_create_dumb;
struct drm_printer;
+struct drm_device;
struct sg_table;
/**
@@ -39,12 +41,21 @@ struct drm_gem_shmem_object {
*/
unsigned int pages_use_count;
+ /**
+ * @pages_pin_count:
+ *
+ * Reference count on the pinned pages table.
+ * The pages can be evicted by memory shrinker
+ * when the count reaches zero.
+ */
+ unsigned int pages_pin_count;
+
/**
* @madv: State for madvise
*
* 0 is active/inuse.
+ * 1 is not-needed/can-be-purged
* A negative value is the object is purged.
- * Positive values are driver specific and not used by the helpers.
*/
int madv;
@@ -91,6 +102,39 @@ struct drm_gem_shmem_object {
* @map_wc: map object write-combined (instead of using shmem defaults).
*/
bool map_wc;
+
+ /**
+ * @eviction_enabled:
+ *
+ * The shmem pages can be evicted only if @eviction_enabled is set to true.
+ * Used internally by memory shrinker.
+ */
+ bool eviction_enabled;
+
+ /**
+ * @purge_enabled:
+ *
+ * The shmem pages can be purged only if @purge_enabled is set to true.
+ * Used internally by memory shrinker.
+ */
+ bool purge_enabled;
+
+ /**
+ * @evicted: True if shmem pages are evicted by the memory shrinker.
+ * Used internally by memory shrinker.
+ */
+ bool evicted;
+
+ /**
+ * @evict:
+ *
+ * Invoked by shmem shrinker before evicting shmem GEM from memory.
+ * GEM's DMA reservation is kept locked by the shrinker. This is
+ * optional callback that should be specified by drivers.
+ *
+ * Returns 0 on success, or -errno on error.
+ */
+ int (*evict)(struct drm_gem_shmem_object *shmem);
};
#define to_drm_gem_shmem_obj(obj) \
@@ -110,14 +154,21 @@ int drm_gem_shmem_mmap(struct drm_gem_shmem_object *shmem, struct vm_area_struct
int drm_gem_shmem_madvise(struct drm_gem_shmem_object *shmem, int madv);
+int drm_gem_shmem_set_purgeable(struct drm_gem_shmem_object *shmem);
+int drm_gem_shmem_set_evictable(struct drm_gem_shmem_object *shmem);
+
static inline bool drm_gem_shmem_is_purgeable(struct drm_gem_shmem_object *shmem)
{
- return (shmem->madv > 0) &&
- !shmem->vmap_use_count && shmem->sgt &&
- !shmem->base.dma_buf && !shmem->base.import_attach;
+ return (shmem->madv > 0) && shmem->evict &&
+ shmem->purge_enabled && shmem->pages_use_count &&
+ !shmem->pages_pin_count && !shmem->base.dma_buf &&
+ !shmem->base.import_attach && (shmem->sgt || shmem->evicted);
}
-void drm_gem_shmem_purge(struct drm_gem_shmem_object *shmem);
+int drm_gem_shmem_swap_in(struct drm_gem_shmem_object *shmem);
+
+int drm_gem_shmem_evict(struct drm_gem_shmem_object *shmem);
+int drm_gem_shmem_purge(struct drm_gem_shmem_object *shmem);
struct sg_table *drm_gem_shmem_get_sg_table(struct drm_gem_shmem_object *shmem);
struct sg_table *drm_gem_shmem_get_pages_sgt(struct drm_gem_shmem_object *shmem);
@@ -260,6 +311,32 @@ static inline int drm_gem_shmem_object_mmap(struct drm_gem_object *obj, struct v
return drm_gem_shmem_mmap(shmem, vma);
}
+/**
+ * struct drm_gem_shmem_shrinker - Generic memory shrinker for shmem GEMs
+ */
+struct drm_gem_shmem_shrinker {
+ /** @base: Shrinker for purging shmem GEM objects */
+ struct shrinker base;
+
+ /** @lock: Protects @lru_* */
+ struct mutex lock;
+
+ /** @lru_pinned: List of pinned shmem GEM objects */
+ struct list_head lru_pinned;
+
+ /** @lru_evictable: List of shmem GEM objects to be evicted */
+ struct list_head lru_evictable;
+
+ /** @lru_evicted: List of evicted shmem GEM objects */
+ struct list_head lru_evicted;
+
+ /** @dev: DRM device that uses this shrinker */
+ struct drm_device *dev;
+};
+
+int drm_gem_shmem_shrinker_register(struct drm_device *dev);
+void drm_gem_shmem_shrinker_unregister(struct drm_device *dev);
+
/*
* Driver ops
*/
--
2.35.3
