[PATCH 1/4] drm/radeon: invalidate moved BOs in the VM

[PATCH 1/4] drm/radeon: invalidate moved BOs in the VM

[Christian König]

From: Christian König <christian.koenig@amd.com>

Don't wait for the BO to be used again, just
update the PT on the next VM use.

Signed-off-by: Christian König <christian.koenig@amd.com>
---
 drivers/gpu/drm/radeon/radeon.h    |  7 +++++-
 drivers/gpu/drm/radeon/radeon_cs.c |  3 ++-
 drivers/gpu/drm/radeon/radeon_vm.c | 51 ++++++++++++++++++++++++++++++--------
 3 files changed, 49 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index 5c9364b..0ec7864 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -447,7 +447,7 @@ struct radeon_bo_va {
 	uint64_t			soffset;
 	uint64_t			eoffset;
 	uint32_t			flags;
-	bool				valid;
+	uint64_t			addr;
 	unsigned			ref_count;
 
 	/* protected by vm mutex */
@@ -871,6 +871,9 @@ struct radeon_vm {
 	struct list_head		va;
 	unsigned			id;
 
+	/* BOs moved, but not yet updated in the PT */
+	struct list_head		invalidated;
+
 	/* BOs freed, but not yet updated in the PT */
 	struct list_head		freed;
 
@@ -2875,6 +2878,8 @@ int radeon_vm_update_page_directory(struct radeon_device *rdev,
 				    struct radeon_vm *vm);
 int radeon_vm_clear_freed(struct radeon_device *rdev,
 			  struct radeon_vm *vm);
+int radeon_vm_clear_invalids(struct radeon_device *rdev,
+			     struct radeon_vm *vm);
 int radeon_vm_bo_update(struct radeon_device *rdev,
 			struct radeon_bo_va *bo_va,
 			struct ttm_mem_reg *mem);
diff --git a/drivers/gpu/drm/radeon/radeon_cs.c b/drivers/gpu/drm/radeon/radeon_cs.c
index 09fcf4d..e372c4142 100644
--- a/drivers/gpu/drm/radeon/radeon_cs.c
+++ b/drivers/gpu/drm/radeon/radeon_cs.c
@@ -500,7 +500,8 @@ static int radeon_bo_vm_update_pte(struct radeon_cs_parser *p,
 		if (r)
 			return r;
 	}
-	return 0;
+
+	return radeon_vm_clear_invalids(rdev, vm);
 }
 
 static int radeon_cs_ib_vm_chunk(struct radeon_device *rdev,
diff --git a/drivers/gpu/drm/radeon/radeon_vm.c b/drivers/gpu/drm/radeon/radeon_vm.c
index 2726b46..f1030fc 100644
--- a/drivers/gpu/drm/radeon/radeon_vm.c
+++ b/drivers/gpu/drm/radeon/radeon_vm.c
@@ -328,7 +328,7 @@ struct radeon_bo_va *radeon_vm_bo_add(struct radeon_device *rdev,
 	bo_va->soffset = 0;
 	bo_va->eoffset = 0;
 	bo_va->flags = 0;
-	bo_va->valid = false;
+	bo_va->addr = 0;
 	bo_va->ref_count = 1;
 	INIT_LIST_HEAD(&bo_va->bo_list);
 	INIT_LIST_HEAD(&bo_va->vm_list);
@@ -481,7 +481,7 @@ int radeon_vm_bo_set_addr(struct radeon_device *rdev,
 	bo_va->soffset = soffset;
 	bo_va->eoffset = eoffset;
 	bo_va->flags = flags;
-	bo_va->valid = false;
+	bo_va->addr = 0;
 	list_move(&bo_va->vm_list, head);
 
 	soffset = (soffset / RADEON_GPU_PAGE_SIZE) >> radeon_vm_block_size;
@@ -842,15 +842,13 @@ int radeon_vm_bo_update(struct radeon_device *rdev,
 	uint64_t addr;
 	int r;
 
-
 	if (!bo_va->soffset) {
 		dev_err(rdev->dev, "bo %p don't has a mapping in vm %p\n",
 			bo_va->bo, vm);
 		return -EINVAL;
 	}
 
-	if ((bo_va->valid && mem) || (!bo_va->valid && mem == NULL))
-		return 0;
+	list_del_init(&bo_va->vm_status);
 
 	bo_va->flags &= ~RADEON_VM_PAGE_VALID;
 	bo_va->flags &= ~RADEON_VM_PAGE_SYSTEM;
@@ -858,7 +856,6 @@ int radeon_vm_bo_update(struct radeon_device *rdev,
 		addr = mem->start << PAGE_SHIFT;
 		if (mem->mem_type != TTM_PL_SYSTEM) {
 			bo_va->flags |= RADEON_VM_PAGE_VALID;
-			bo_va->valid = true;
 		}
 		if (mem->mem_type == TTM_PL_TT) {
 			bo_va->flags |= RADEON_VM_PAGE_SYSTEM;
@@ -867,9 +864,12 @@ int radeon_vm_bo_update(struct radeon_device *rdev,
 		}
 	} else {
 		addr = 0;
-		bo_va->valid = false;
 	}
 
+	if (addr == bo_va->addr)
+		return 0;
+	bo_va->addr = addr;
+
 	trace_radeon_vm_bo_update(bo_va);
 
 	nptes = (bo_va->eoffset - bo_va->soffset) / RADEON_GPU_PAGE_SIZE;
@@ -932,7 +932,6 @@ int radeon_vm_clear_freed(struct radeon_device *rdev,
 	int r;
 
 	list_for_each_entry_safe(bo_va, tmp, &vm->freed, vm_status) {
-		list_del(&bo_va->vm_status);
 		r = radeon_vm_bo_update(rdev, bo_va, NULL);
 		kfree(bo_va);
 		if (r)
@@ -943,6 +942,31 @@ int radeon_vm_clear_freed(struct radeon_device *rdev,
 }
 
 /**
+ * radeon_vm_clear_invalids - clear invalidated BOs in the PT
+ *
+ * @rdev: radeon_device pointer
+ * @vm: requested vm
+ *
+ * Make sure all invalidated BOs are cleared in the PT.
+ * Returns 0 for success.
+ *
+ * PTs have to be reserved and mutex must be locked!
+ */
+int radeon_vm_clear_invalids(struct radeon_device *rdev,
+			     struct radeon_vm *vm)
+{
+	struct radeon_bo_va *bo_va, *tmp;
+	int r;
+
+	list_for_each_entry_safe(bo_va, tmp, &vm->invalidated, vm_status) {
+		r = radeon_vm_bo_update(rdev, bo_va, NULL);
+		if (r)
+			return r;
+	}
+	return 0;
+}
+
+/**
  * radeon_vm_bo_rmv - remove a bo to a specific vm
  *
  * @rdev: radeon_device pointer
@@ -961,8 +985,9 @@ void radeon_vm_bo_rmv(struct radeon_device *rdev,
 
 	mutex_lock(&vm->mutex);
 	list_del(&bo_va->vm_list);
+	list_del(&bo_va->vm_status);
 
-	if (bo_va->soffset) {
+	if (bo_va->addr) {
 		bo_va->bo = NULL;
 		list_add(&bo_va->vm_status, &vm->freed);
 	} else {
@@ -987,7 +1012,12 @@ void radeon_vm_bo_invalidate(struct radeon_device *rdev,
 	struct radeon_bo_va *bo_va;
 
 	list_for_each_entry(bo_va, &bo->va, bo_list) {
-		bo_va->valid = false;
+		if (bo_va->addr) {
+			mutex_lock(&bo_va->vm->mutex);
+			list_del(&bo_va->vm_status);
+			list_add(&bo_va->vm_status, &bo_va->vm->invalidated);
+			mutex_unlock(&bo_va->vm->mutex);
+		}
 	}
 }
 
@@ -1012,6 +1042,7 @@ int radeon_vm_init(struct radeon_device *rdev, struct radeon_vm *vm)
 	vm->last_id_use = NULL;
 	mutex_init(&vm->mutex);
 	INIT_LIST_HEAD(&vm->va);
+	INIT_LIST_HEAD(&vm->invalidated);;
 	INIT_LIST_HEAD(&vm->freed);
 
 	pd_size = radeon_vm_directory_size(rdev);
-- 
1.9.1

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[PATCH 2/4] drm/radeon: remove radeon_bo_clear_va

[Christian König]

From: Christian König <christian.koenig@amd.com>

Won't work anyway, instead WARN_ON if the VA list isn't
empty when we free the BO.

Signed-off-by: Christian König <christian.koenig@amd.com>
---
 drivers/gpu/drm/radeon/radeon_object.c | 12 +-----------
 1 file changed, 1 insertion(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon_object.c b/drivers/gpu/drm/radeon/radeon_object.c
index 6c717b2..5a575f6 100644
--- a/drivers/gpu/drm/radeon/radeon_object.c
+++ b/drivers/gpu/drm/radeon/radeon_object.c
@@ -46,16 +46,6 @@ static void radeon_bo_clear_surface_reg(struct radeon_bo *bo);
  * function are calling it.
  */
 
-static void radeon_bo_clear_va(struct radeon_bo *bo)
-{
-	struct radeon_bo_va *bo_va, *tmp;
-
-	list_for_each_entry_safe(bo_va, tmp, &bo->va, bo_list) {
-		/* remove from all vm address space */
-		radeon_vm_bo_rmv(bo->rdev, bo_va);
-	}
-}
-
 static void radeon_update_memory_usage(struct radeon_bo *bo,
 				       unsigned mem_type, int sign)
 {
@@ -90,7 +80,7 @@ static void radeon_ttm_bo_destroy(struct ttm_buffer_object *tbo)
 	list_del_init(&bo->list);
 	mutex_unlock(&bo->rdev->gem.mutex);
 	radeon_bo_clear_surface_reg(bo);
-	radeon_bo_clear_va(bo);
+	WARN_ON(!list_empty(&bo->va));
 	drm_gem_object_release(&bo->gem_base);
 	kfree(bo);
 }
-- 
1.9.1

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[PATCH 3/4] drm/radeon: use an intervall tree to manage the VMA

[Christian König]

From: Christian König <christian.koenig@amd.com>

Scales much better than scanning the address range linearly.

Signed-off-by: Christian König <christian.koenig@amd.com>
---
 drivers/gpu/drm/Kconfig               |  1 +
 drivers/gpu/drm/radeon/radeon.h       |  7 ++-
 drivers/gpu/drm/radeon/radeon_gem.c   |  4 +-
 drivers/gpu/drm/radeon/radeon_trace.h |  4 +-
 drivers/gpu/drm/radeon/radeon_vm.c    | 84 +++++++++++++++++------------------
 5 files changed, 48 insertions(+), 52 deletions(-)

diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index f512004..9b2eedc 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -114,6 +114,7 @@ config DRM_RADEON
 	select POWER_SUPPLY
 	select HWMON
 	select BACKLIGHT_CLASS_DEVICE
+	select INTERVAL_TREE
 	help
 	  Choose this option if you have an ATI Radeon graphics card.  There
 	  are both PCI and AGP versions.  You don't need to choose this to
diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index 0ec7864..aa8721b 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -64,6 +64,7 @@
 #include <linux/wait.h>
 #include <linux/list.h>
 #include <linux/kref.h>
+#include <linux/interval_tree.h>
 
 #include <ttm/ttm_bo_api.h>
 #include <ttm/ttm_bo_driver.h>
@@ -444,14 +445,12 @@ struct radeon_mman {
 struct radeon_bo_va {
 	/* protected by bo being reserved */
 	struct list_head		bo_list;
-	uint64_t			soffset;
-	uint64_t			eoffset;
 	uint32_t			flags;
 	uint64_t			addr;
 	unsigned			ref_count;
 
 	/* protected by vm mutex */
-	struct list_head		vm_list;
+	struct interval_tree_node	it;
 	struct list_head		vm_status;
 
 	/* constant after initialization */
@@ -868,7 +867,7 @@ struct radeon_vm_pt {
 };
 
 struct radeon_vm {
-	struct list_head		va;
+	struct rb_root			va;
 	unsigned			id;
 
 	/* BOs moved, but not yet updated in the PT */
diff --git a/drivers/gpu/drm/radeon/radeon_gem.c b/drivers/gpu/drm/radeon/radeon_gem.c
index 07a13c9..b2f2ba2 100644
--- a/drivers/gpu/drm/radeon/radeon_gem.c
+++ b/drivers/gpu/drm/radeon/radeon_gem.c
@@ -502,9 +502,9 @@ int radeon_gem_va_ioctl(struct drm_device *dev, void *data,
 
 	switch (args->operation) {
 	case RADEON_VA_MAP:
-		if (bo_va->soffset) {
+		if (bo_va->it.start) {
 			args->operation = RADEON_VA_RESULT_VA_EXIST;
-			args->offset = bo_va->soffset;
+			args->offset = bo_va->it.start;
 			goto out;
 		}
 		r = radeon_vm_bo_set_addr(rdev, bo_va, args->offset, args->flags);
diff --git a/drivers/gpu/drm/radeon/radeon_trace.h b/drivers/gpu/drm/radeon/radeon_trace.h
index f749f2c..2ae4eaa 100644
--- a/drivers/gpu/drm/radeon/radeon_trace.h
+++ b/drivers/gpu/drm/radeon/radeon_trace.h
@@ -72,8 +72,8 @@ TRACE_EVENT(radeon_vm_bo_update,
 			     ),
 
 	    TP_fast_assign(
-			   __entry->soffset = bo_va->soffset;
-			   __entry->eoffset = bo_va->eoffset;
+			   __entry->soffset = bo_va->it.start;
+			   __entry->eoffset = bo_va->it.last + 1;
 			   __entry->flags = bo_va->flags;
 			   ),
 	    TP_printk("soffs=%010llx, eoffs=%010llx, flags=%08x",
diff --git a/drivers/gpu/drm/radeon/radeon_vm.c b/drivers/gpu/drm/radeon/radeon_vm.c
index f1030fc..dcbcfbf 100644
--- a/drivers/gpu/drm/radeon/radeon_vm.c
+++ b/drivers/gpu/drm/radeon/radeon_vm.c
@@ -325,17 +325,15 @@ struct radeon_bo_va *radeon_vm_bo_add(struct radeon_device *rdev,
 	}
 	bo_va->vm = vm;
 	bo_va->bo = bo;
-	bo_va->soffset = 0;
-	bo_va->eoffset = 0;
+	bo_va->it.start = 0;
+	bo_va->it.last = 0;
 	bo_va->flags = 0;
 	bo_va->addr = 0;
 	bo_va->ref_count = 1;
 	INIT_LIST_HEAD(&bo_va->bo_list);
-	INIT_LIST_HEAD(&bo_va->vm_list);
 	INIT_LIST_HEAD(&bo_va->vm_status);
 
 	mutex_lock(&vm->mutex);
-	list_add(&bo_va->vm_list, &vm->va);
 	list_add_tail(&bo_va->bo_list, &bo->va);
 	mutex_unlock(&vm->mutex);
 
@@ -419,11 +417,9 @@ int radeon_vm_bo_set_addr(struct radeon_device *rdev,
 			  uint32_t flags)
 {
 	uint64_t size = radeon_bo_size(bo_va->bo);
-	uint64_t eoffset, last_offset = 0;
 	struct radeon_vm *vm = bo_va->vm;
-	struct radeon_bo_va *tmp;
-	struct list_head *head;
 	unsigned last_pfn, pt_idx;
+	uint64_t eoffset;
 	int r;
 
 	if (soffset) {
@@ -445,44 +441,43 @@ int radeon_vm_bo_set_addr(struct radeon_device *rdev,
 	}
 
 	mutex_lock(&vm->mutex);
-	head = &vm->va;
-	last_offset = 0;
-	list_for_each_entry(tmp, &vm->va, vm_list) {
-		if (bo_va == tmp) {
-			/* skip over currently modified bo */
-			continue;
+	if (bo_va->it.start || bo_va->it.last) {
+		if (bo_va->addr) {
+			/* add a clone of the bo_va to clear the old address */
+			struct radeon_bo_va *tmp;
+			tmp = kzalloc(sizeof(struct radeon_bo_va), GFP_KERNEL);
+			tmp->it.start = bo_va->it.start;
+			tmp->it.last = bo_va->it.last;
+			tmp->vm = vm;
+			tmp->addr = bo_va->addr;
+			list_add(&tmp->vm_status, &vm->freed);
 		}
 
-		if (soffset >= last_offset && eoffset <= tmp->soffset) {
-			/* bo can be added before this one */
-			break;
-		}
-		if (eoffset > tmp->soffset && soffset < tmp->eoffset) {
+		interval_tree_remove(&bo_va->it, &vm->va);
+		bo_va->it.start = 0;
+		bo_va->it.last = 0;
+	}
+
+	if (soffset || eoffset) {
+		struct interval_tree_node *it;
+		it = interval_tree_iter_first(&vm->va, soffset, eoffset - 1);
+		if (it) {
+			struct radeon_bo_va *tmp;
+			tmp = container_of(it, struct radeon_bo_va, it);
 			/* bo and tmp overlap, invalid offset */
-			dev_err(rdev->dev, "bo %p va 0x%08X conflict with (bo %p 0x%08X 0x%08X)\n",
-				bo_va->bo, (unsigned)bo_va->soffset, tmp->bo,
-				(unsigned)tmp->soffset, (unsigned)tmp->eoffset);
+			dev_err(rdev->dev, "bo %p va 0x%010Lx conflict with "
+				"(bo %p 0x%010lx 0x%010lx)\n", bo_va->bo,
+				soffset, tmp->bo, tmp->it.start, tmp->it.last);
 			mutex_unlock(&vm->mutex);
 			return -EINVAL;
 		}
-		last_offset = tmp->eoffset;
-		head = &tmp->vm_list;
-	}
-
-	if (bo_va->soffset) {
-		/* add a clone of the bo_va to clear the old address */
-		tmp = kzalloc(sizeof(struct radeon_bo_va), GFP_KERNEL);
-		tmp->soffset = bo_va->soffset;
-		tmp->eoffset = bo_va->eoffset;
-		tmp->vm = vm;
-		list_add(&tmp->vm_status, &vm->freed);
+		bo_va->it.start = soffset;
+		bo_va->it.last = eoffset - 1;
+		interval_tree_insert(&bo_va->it, &vm->va);
 	}
 
-	bo_va->soffset = soffset;
-	bo_va->eoffset = eoffset;
 	bo_va->flags = flags;
 	bo_va->addr = 0;
-	list_move(&bo_va->vm_list, head);
 
 	soffset = (soffset / RADEON_GPU_PAGE_SIZE) >> radeon_vm_block_size;
 	eoffset = (eoffset / RADEON_GPU_PAGE_SIZE) >> radeon_vm_block_size;
@@ -842,7 +837,7 @@ int radeon_vm_bo_update(struct radeon_device *rdev,
 	uint64_t addr;
 	int r;
 
-	if (!bo_va->soffset) {
+	if (!bo_va->it.start) {
 		dev_err(rdev->dev, "bo %p don't has a mapping in vm %p\n",
 			bo_va->bo, vm);
 		return -EINVAL;
@@ -872,7 +867,7 @@ int radeon_vm_bo_update(struct radeon_device *rdev,
 
 	trace_radeon_vm_bo_update(bo_va);
 
-	nptes = (bo_va->eoffset - bo_va->soffset) / RADEON_GPU_PAGE_SIZE;
+	nptes = (bo_va->it.last - bo_va->it.start + 1) / RADEON_GPU_PAGE_SIZE;
 
 	/* padding, etc. */
 	ndw = 64;
@@ -897,8 +892,9 @@ int radeon_vm_bo_update(struct radeon_device *rdev,
 		return r;
 	ib.length_dw = 0;
 
-	radeon_vm_update_ptes(rdev, vm, &ib, bo_va->soffset, bo_va->eoffset,
-			      addr, radeon_vm_page_flags(bo_va->flags));
+	radeon_vm_update_ptes(rdev, vm, &ib, bo_va->it.start,
+			      bo_va->it.last + 1, addr,
+			      radeon_vm_page_flags(bo_va->flags));
 
 	radeon_semaphore_sync_to(ib.semaphore, vm->fence);
 	r = radeon_ib_schedule(rdev, &ib, NULL);
@@ -984,7 +980,7 @@ void radeon_vm_bo_rmv(struct radeon_device *rdev,
 	list_del(&bo_va->bo_list);
 
 	mutex_lock(&vm->mutex);
-	list_del(&bo_va->vm_list);
+	interval_tree_remove(&bo_va->it, &vm->va);
 	list_del(&bo_va->vm_status);
 
 	if (bo_va->addr) {
@@ -1041,7 +1037,7 @@ int radeon_vm_init(struct radeon_device *rdev, struct radeon_vm *vm)
 	vm->last_flush = NULL;
 	vm->last_id_use = NULL;
 	mutex_init(&vm->mutex);
-	INIT_LIST_HEAD(&vm->va);
+	vm->va = RB_ROOT;
 	INIT_LIST_HEAD(&vm->invalidated);;
 	INIT_LIST_HEAD(&vm->freed);
 
@@ -1086,11 +1082,11 @@ void radeon_vm_fini(struct radeon_device *rdev, struct radeon_vm *vm)
 	struct radeon_bo_va *bo_va, *tmp;
 	int i, r;
 
-	if (!list_empty(&vm->va)) {
+	if (!RB_EMPTY_ROOT(&vm->va)) {
 		dev_err(rdev->dev, "still active bo inside vm\n");
 	}
-	list_for_each_entry_safe(bo_va, tmp, &vm->va, vm_list) {
-		list_del_init(&bo_va->vm_list);
+	rbtree_postorder_for_each_entry_safe(bo_va, tmp, &vm->va, it.rb) {
+		interval_tree_remove(&bo_va->it, &vm->va);
 		r = radeon_bo_reserve(bo_va->bo, false);
 		if (!r) {
 			list_del_init(&bo_va->bo_list);
-- 
1.9.1

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[PATCH 4/4] drm/radeon: try to enable VM flushing once more

[Christian König]

From: Christian König <christian.koenig@amd.com>

Let's try to fix bugs related to this instead of just disabling it.

Signed-off-by: Christian König <christian.koenig@amd.com>
---
 drivers/gpu/drm/radeon/radeon_vm.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon_vm.c b/drivers/gpu/drm/radeon/radeon_vm.c
index dcbcfbf..f6787bb 100644
--- a/drivers/gpu/drm/radeon/radeon_vm.c
+++ b/drivers/gpu/drm/radeon/radeon_vm.c
@@ -238,8 +238,7 @@ void radeon_vm_flush(struct radeon_device *rdev,
 	uint64_t pd_addr = radeon_bo_gpu_offset(vm->page_directory);
 
 	/* if we can't remember our last VM flush then flush now! */
-	/* XXX figure out why we have to flush all the time */
-	if (!vm->last_flush || true || pd_addr != vm->pd_gpu_addr) {
+	if (!vm->last_flush || pd_addr != vm->pd_gpu_addr) {
 		vm->pd_gpu_addr = pd_addr;
 		radeon_ring_vm_flush(rdev, ring, vm);
 	}
-- 
1.9.1

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Re: [PATCH 1/4] drm/radeon: invalidate moved BOs in the VM

[Michel Dänzer]

This series is

Tested-by: Michel Dänzer <michel.daenzer@amd.com>


-- 
Earthling Michel Dänzer            |                  http://www.amd.com
Libre software enthusiast          |                Mesa and X developer
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