drm/radeon: add userptr flag to register MMU notifier v3
Whenever userspace mapping related to our userptr change
we wait for it to become idle and unmap it from GTT.
v2: rebased, fix mutex unlock in error path
v3: improve commit message
Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/radeon/radeon_mn.c b/drivers/gpu/drm/radeon/radeon_mn.c
new file mode 100644
index 0000000..0157bc2
--- /dev/null
+++ b/drivers/gpu/drm/radeon/radeon_mn.c
@@ -0,0 +1,272 @@
+/*
+ * Copyright 2014 Advanced Micro Devices, Inc.
+ * All Rights Reserved.
+ *
+ * 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, sub license, 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 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 NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS 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.
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ */
+/*
+ * Authors:
+ * Christian König <christian.koenig@amd.com>
+ */
+
+#include <linux/firmware.h>
+#include <linux/module.h>
+#include <linux/mmu_notifier.h>
+#include <drm/drmP.h>
+#include <drm/drm.h>
+
+#include "radeon.h"
+
+struct radeon_mn {
+ /* constant after initialisation */
+ struct radeon_device *rdev;
+ struct mm_struct *mm;
+ struct mmu_notifier mn;
+
+ /* only used on destruction */
+ struct work_struct work;
+
+ /* protected by rdev->mn_lock */
+ struct hlist_node node;
+
+ /* objects protected by lock */
+ struct mutex lock;
+ struct rb_root objects;
+};
+
+/**
+ * radeon_mn_destroy - destroy the rmn
+ *
+ * @work: previously sheduled work item
+ *
+ * Lazy destroys the notifier from a work item
+ */
+static void radeon_mn_destroy(struct work_struct *work)
+{
+ struct radeon_mn *rmn = container_of(work, struct radeon_mn, work);
+ struct radeon_device *rdev = rmn->rdev;
+ struct radeon_bo *bo, *next;
+
+ mutex_lock(&rdev->mn_lock);
+ mutex_lock(&rmn->lock);
+ hash_del(&rmn->node);
+ rbtree_postorder_for_each_entry_safe(bo, next, &rmn->objects, mn_it.rb) {
+ interval_tree_remove(&bo->mn_it, &rmn->objects);
+ bo->mn = NULL;
+ }
+ mutex_unlock(&rmn->lock);
+ mutex_unlock(&rdev->mn_lock);
+ mmu_notifier_unregister(&rmn->mn, rmn->mm);
+ kfree(rmn);
+}
+
+/**
+ * radeon_mn_release - callback to notify about mm destruction
+ *
+ * @mn: our notifier
+ * @mn: the mm this callback is about
+ *
+ * Shedule a work item to lazy destroy our notifier.
+ */
+static void radeon_mn_release(struct mmu_notifier *mn,
+ struct mm_struct *mm)
+{
+ struct radeon_mn *rmn = container_of(mn, struct radeon_mn, mn);
+ INIT_WORK(&rmn->work, radeon_mn_destroy);
+ schedule_work(&rmn->work);
+}
+
+/**
+ * radeon_mn_invalidate_range_start - callback to notify about mm change
+ *
+ * @mn: our notifier
+ * @mn: the mm this callback is about
+ * @start: start of updated range
+ * @end: end of updated range
+ *
+ * We block for all BOs between start and end to be idle and
+ * unmap them by move them into system domain again.
+ */
+static void radeon_mn_invalidate_range_start(struct mmu_notifier *mn,
+ struct mm_struct *mm,
+ unsigned long start,
+ unsigned long end)
+{
+ struct radeon_mn *rmn = container_of(mn, struct radeon_mn, mn);
+ struct interval_tree_node *it;
+
+ /* notification is exclusive, but interval is inclusive */
+ end -= 1;
+
+ mutex_lock(&rmn->lock);
+
+ it = interval_tree_iter_first(&rmn->objects, start, end);
+ while (it) {
+ struct radeon_bo *bo;
+ int r;
+
+ bo = container_of(it, struct radeon_bo, mn_it);
+ it = interval_tree_iter_next(it, start, end);
+
+ r = radeon_bo_reserve(bo, true);
+ if (r) {
+ DRM_ERROR("(%d) failed to reserve user bo\n", r);
+ continue;
+ }
+
+ if (bo->tbo.sync_obj) {
+ r = radeon_fence_wait(bo->tbo.sync_obj, false);
+ if (r)
+ DRM_ERROR("(%d) failed to wait for user bo\n", r);
+ }
+
+ radeon_ttm_placement_from_domain(bo, RADEON_GEM_DOMAIN_CPU);
+ r = ttm_bo_validate(&bo->tbo, &bo->placement, false, false);
+ if (r)
+ DRM_ERROR("(%d) failed to validate user bo\n", r);
+
+ radeon_bo_unreserve(bo);
+ }
+
+ mutex_unlock(&rmn->lock);
+}
+
+static const struct mmu_notifier_ops radeon_mn_ops = {
+ .release = radeon_mn_release,
+ .invalidate_range_start = radeon_mn_invalidate_range_start,
+};
+
+/**
+ * radeon_mn_get - create notifier context
+ *
+ * @rdev: radeon device pointer
+ *
+ * Creates a notifier context for current->mm.
+ */
+static struct radeon_mn *radeon_mn_get(struct radeon_device *rdev)
+{
+ struct mm_struct *mm = current->mm;
+ struct radeon_mn *rmn;
+ int r;
+
+ down_write(&mm->mmap_sem);
+ mutex_lock(&rdev->mn_lock);
+
+ hash_for_each_possible(rdev->mn_hash, rmn, node, (unsigned long)mm)
+ if (rmn->mm == mm)
+ goto release_locks;
+
+ rmn = kzalloc(sizeof(*rmn), GFP_KERNEL);
+ if (!rmn) {
+ rmn = ERR_PTR(-ENOMEM);
+ goto release_locks;
+ }
+
+ rmn->rdev = rdev;
+ rmn->mm = mm;
+ rmn->mn.ops = &radeon_mn_ops;
+ mutex_init(&rmn->lock);
+ rmn->objects = RB_ROOT;
+
+ r = __mmu_notifier_register(&rmn->mn, mm);
+ if (r)
+ goto free_rmn;
+
+ hash_add(rdev->mn_hash, &rmn->node, (unsigned long)mm);
+
+release_locks:
+ mutex_unlock(&rdev->mn_lock);
+ up_write(&mm->mmap_sem);
+
+ return rmn;
+
+free_rmn:
+ mutex_unlock(&rdev->mn_lock);
+ up_write(&mm->mmap_sem);
+ kfree(rmn);
+
+ return ERR_PTR(r);
+}
+
+/**
+ * radeon_mn_register - register a BO for notifier updates
+ *
+ * @bo: radeon buffer object
+ * @addr: userptr addr we should monitor
+ *
+ * Registers an MMU notifier for the given BO at the specified address.
+ * Returns 0 on success, -ERRNO if anything goes wrong.
+ */
+int radeon_mn_register(struct radeon_bo *bo, unsigned long addr)
+{
+ unsigned long end = addr + radeon_bo_size(bo) - 1;
+ struct radeon_device *rdev = bo->rdev;
+ struct radeon_mn *rmn;
+ struct interval_tree_node *it;
+
+ rmn = radeon_mn_get(rdev);
+ if (IS_ERR(rmn))
+ return PTR_ERR(rmn);
+
+ mutex_lock(&rmn->lock);
+
+ it = interval_tree_iter_first(&rmn->objects, addr, end);
+ if (it) {
+ mutex_unlock(&rmn->lock);
+ return -EEXIST;
+ }
+
+ bo->mn = rmn;
+ bo->mn_it.start = addr;
+ bo->mn_it.last = end;
+ interval_tree_insert(&bo->mn_it, &rmn->objects);
+
+ mutex_unlock(&rmn->lock);
+
+ return 0;
+}
+
+/**
+ * radeon_mn_unregister - unregister a BO for notifier updates
+ *
+ * @bo: radeon buffer object
+ *
+ * Remove any registration of MMU notifier updates from the buffer object.
+ */
+void radeon_mn_unregister(struct radeon_bo *bo)
+{
+ struct radeon_device *rdev = bo->rdev;
+ struct radeon_mn *rmn;
+
+ mutex_lock(&rdev->mn_lock);
+ rmn = bo->mn;
+ if (rmn == NULL) {
+ mutex_unlock(&rdev->mn_lock);
+ return;
+ }
+
+ mutex_lock(&rmn->lock);
+ interval_tree_remove(&bo->mn_it, &rmn->objects);
+ bo->mn = NULL;
+ mutex_unlock(&rmn->lock);
+ mutex_unlock(&rdev->mn_lock);
+}