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From: "Christian König" <ckoenig.leichtzumerken@gmail.com>
To: linaro-mm-sig@lists.linaro.org, dri-devel@lists.freedesktop.org,
	linux-media@vger.kernel.org, intel-gfx@lists.freedesktop.org
Cc: daniel@ffwll.ch
Subject: [PATCH 01/26] dma-buf: add dma_resv_for_each_fence_unlocked v2
Date: Fri, 17 Sep 2021 14:34:48 +0200	[thread overview]
Message-ID: <20210917123513.1106-2-christian.koenig@amd.com> (raw)
In-Reply-To: <20210917123513.1106-1-christian.koenig@amd.com>

Abstract the complexity of iterating over all the fences
in a dma_resv object.

The new loop handles the whole RCU and retry dance and
returns only fences where we can be sure we grabbed the
right one.

v2: fix accessing the shared fences while they might be freed,
    improve kerneldoc, rename _cursor to _iter, add
    dma_resv_iter_is_exclusive, add dma_resv_iter_begin/end

Signed-off-by: Christian König <christian.koenig@amd.com>
---
 drivers/dma-buf/dma-resv.c | 61 +++++++++++++++++++++++++++
 include/linux/dma-resv.h   | 84 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 145 insertions(+)

diff --git a/drivers/dma-buf/dma-resv.c b/drivers/dma-buf/dma-resv.c
index 84fbe60629e3..3e77cad2c9d4 100644
--- a/drivers/dma-buf/dma-resv.c
+++ b/drivers/dma-buf/dma-resv.c
@@ -323,6 +323,67 @@ void dma_resv_add_excl_fence(struct dma_resv *obj, struct dma_fence *fence)
 }
 EXPORT_SYMBOL(dma_resv_add_excl_fence);
 
+/**
+ * dma_resv_iter_walk_unlocked - walk over fences in a dma_resv obj
+ * @cursor: cursor to record the current position
+ * @first: if we should start over
+ *
+ * Return all the fences in the dma_resv object which are not yet signaled.
+ * The returned fence has an extra local reference so will stay alive.
+ * If a concurrent modify is detected the whole iterration is started over again.
+ */
+struct dma_fence *dma_resv_iter_walk_unlocked(struct dma_resv_iter *cursor,
+					      bool first)
+{
+	struct dma_resv *obj = cursor->obj;
+
+	first |= read_seqcount_retry(&obj->seq, cursor->seq);
+	do {
+		/* Drop the reference from the previous round */
+		dma_fence_put(cursor->fence);
+
+		cursor->is_first = first;
+		if (first) {
+			cursor->seq = read_seqcount_begin(&obj->seq);
+			cursor->index = -1;
+			cursor->fences = dma_resv_shared_list(obj);
+
+			cursor->fence = dma_resv_excl_fence(obj);
+			if (cursor->fence &&
+			    test_bit(DMA_FENCE_FLAG_SIGNALED_BIT,
+				     &cursor->fence->flags))
+				cursor->fence = NULL;
+		} else {
+			cursor->fence = NULL;
+		}
+
+		if (cursor->fence) {
+			cursor->fence = dma_fence_get_rcu(cursor->fence);
+		} else if (cursor->all_fences && cursor->fences) {
+			struct dma_resv_list *fences = cursor->fences;
+
+			while (++cursor->index < fences->shared_count) {
+				cursor->fence = rcu_dereference(
+					fences->shared[cursor->index]);
+				if (!test_bit(DMA_FENCE_FLAG_SIGNALED_BIT,
+					      &cursor->fence->flags))
+					break;
+			}
+			if (cursor->index < fences->shared_count)
+				cursor->fence =
+					dma_fence_get_rcu(cursor->fence);
+			else
+				cursor->fence = NULL;
+		}
+
+		/* For the eventually next round */
+		first = true;
+	} while (read_seqcount_retry(&obj->seq, cursor->seq));
+
+	return cursor->fence;
+}
+EXPORT_SYMBOL_GPL(dma_resv_iter_walk_unlocked);
+
 /**
  * dma_resv_copy_fences - Copy all fences from src to dst.
  * @dst: the destination reservation object
diff --git a/include/linux/dma-resv.h b/include/linux/dma-resv.h
index 9100dd3dc21f..693d16117153 100644
--- a/include/linux/dma-resv.h
+++ b/include/linux/dma-resv.h
@@ -149,6 +149,90 @@ struct dma_resv {
 	struct dma_resv_list __rcu *fence;
 };
 
+/**
+ * struct dma_resv_iter - current position into the dma_resv fences
+ *
+ * Don't touch this directly in the driver, use the accessor function instead.
+ */
+struct dma_resv_iter {
+	/** @obj: The dma_resv object we iterate over */
+	struct dma_resv *obj;
+
+	/** @all_fences: If all fences should be returned */
+	bool all_fences;
+
+	/** @fence: the currently handled fence */
+	struct dma_fence *fence;
+
+	/** @seq: sequence number to check for modifications */
+	unsigned int seq;
+
+	/** @index: index into the shared fences */
+	unsigned int index;
+
+	/** @fences: the shared fences */
+	struct dma_resv_list *fences;
+
+	/** @is_first: true if this is the first returned fence */
+	bool is_first;
+};
+
+struct dma_fence *dma_resv_iter_walk_unlocked(struct dma_resv_iter *cursor,
+					      bool first);
+
+/**
+ * dma_resv_iter_begin - initialize a dma_resv_iter object
+ * @cursor: The dma_resv_iter object to initialize
+ * @obj: The dma_resv object which we want to iterator over
+ * @all_fences: If all fences should be returned or just the exclusive one
+ */
+static inline void dma_resv_iter_begin(struct dma_resv_iter *cursor,
+					struct dma_resv *obj,
+					bool all_fences)
+{
+	cursor->obj = obj;
+	cursor->all_fences = all_fences;
+	cursor->fence = NULL;
+}
+
+/**
+ * dma_resv_iter_end - cleanup a dma_resv_iter object
+ * @cursor: the dma_resv_iter object which should be cleaned up
+ *
+ * Make sure that the reference to the fence in the cursor is properly
+ * dropped.
+ */
+static inline void dma_resv_iter_end(struct dma_resv_iter *cursor)
+{
+	dma_fence_put(cursor->fence);
+}
+
+/**
+ * dma_resv_iter_is_exclusive - test if the current fence is the exclusive one
+ * @cursor: the cursor of the current position
+ *
+ * Returns true if the currently returned fence is the exclusive one.
+ */
+static inline bool dma_resv_iter_is_exclusive(struct dma_resv_iter *cursor)
+{
+	return cursor->index == -1;
+}
+
+/**
+ * dma_resv_for_each_fence_unlocked - unlocked fence iterator
+ * @cursor: a struct dma_resv_iter pointer
+ * @fence: the current fence
+ *
+ * Iterate over the fences in a struct dma_resv object without holding the
+ * dma_resv::lock. The RCU read side lock must be hold when using this, but can
+ * be dropped and re-taken as necessary inside the loop. The cursor needs to be
+ * initialized with dma_resv_iter_begin_unlocked() and cleaned up with
+ * dma_resv_iter_end_unlocked().
+ */
+#define dma_resv_for_each_fence_unlocked(cursor, fence)			\
+	for (fence = dma_resv_iter_walk_unlocked(cursor, true);		\
+	     fence; fence = dma_resv_iter_walk_unlocked(cursor, false))
+
 #define dma_resv_held(obj) lockdep_is_held(&(obj)->lock.base)
 #define dma_resv_assert_held(obj) lockdep_assert_held(&(obj)->lock.base)
 
-- 
2.25.1


WARNING: multiple messages have this Message-ID
From: "Christian König" <ckoenig.leichtzumerken@gmail.com>
To: linaro-mm-sig@lists.linaro.org, dri-devel@lists.freedesktop.org,
	linux-media@vger.kernel.org, intel-gfx@lists.freedesktop.org
Cc: daniel@ffwll.ch
Subject: [Intel-gfx] [PATCH 01/26] dma-buf: add dma_resv_for_each_fence_unlocked v2
Date: Fri, 17 Sep 2021 14:34:48 +0200	[thread overview]
Message-ID: <20210917123513.1106-2-christian.koenig@amd.com> (raw)
In-Reply-To: <20210917123513.1106-1-christian.koenig@amd.com>

Abstract the complexity of iterating over all the fences
in a dma_resv object.

The new loop handles the whole RCU and retry dance and
returns only fences where we can be sure we grabbed the
right one.

v2: fix accessing the shared fences while they might be freed,
    improve kerneldoc, rename _cursor to _iter, add
    dma_resv_iter_is_exclusive, add dma_resv_iter_begin/end

Signed-off-by: Christian König <christian.koenig@amd.com>
---
 drivers/dma-buf/dma-resv.c | 61 +++++++++++++++++++++++++++
 include/linux/dma-resv.h   | 84 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 145 insertions(+)

diff --git a/drivers/dma-buf/dma-resv.c b/drivers/dma-buf/dma-resv.c
index 84fbe60629e3..3e77cad2c9d4 100644
--- a/drivers/dma-buf/dma-resv.c
+++ b/drivers/dma-buf/dma-resv.c
@@ -323,6 +323,67 @@ void dma_resv_add_excl_fence(struct dma_resv *obj, struct dma_fence *fence)
 }
 EXPORT_SYMBOL(dma_resv_add_excl_fence);
 
+/**
+ * dma_resv_iter_walk_unlocked - walk over fences in a dma_resv obj
+ * @cursor: cursor to record the current position
+ * @first: if we should start over
+ *
+ * Return all the fences in the dma_resv object which are not yet signaled.
+ * The returned fence has an extra local reference so will stay alive.
+ * If a concurrent modify is detected the whole iterration is started over again.
+ */
+struct dma_fence *dma_resv_iter_walk_unlocked(struct dma_resv_iter *cursor,
+					      bool first)
+{
+	struct dma_resv *obj = cursor->obj;
+
+	first |= read_seqcount_retry(&obj->seq, cursor->seq);
+	do {
+		/* Drop the reference from the previous round */
+		dma_fence_put(cursor->fence);
+
+		cursor->is_first = first;
+		if (first) {
+			cursor->seq = read_seqcount_begin(&obj->seq);
+			cursor->index = -1;
+			cursor->fences = dma_resv_shared_list(obj);
+
+			cursor->fence = dma_resv_excl_fence(obj);
+			if (cursor->fence &&
+			    test_bit(DMA_FENCE_FLAG_SIGNALED_BIT,
+				     &cursor->fence->flags))
+				cursor->fence = NULL;
+		} else {
+			cursor->fence = NULL;
+		}
+
+		if (cursor->fence) {
+			cursor->fence = dma_fence_get_rcu(cursor->fence);
+		} else if (cursor->all_fences && cursor->fences) {
+			struct dma_resv_list *fences = cursor->fences;
+
+			while (++cursor->index < fences->shared_count) {
+				cursor->fence = rcu_dereference(
+					fences->shared[cursor->index]);
+				if (!test_bit(DMA_FENCE_FLAG_SIGNALED_BIT,
+					      &cursor->fence->flags))
+					break;
+			}
+			if (cursor->index < fences->shared_count)
+				cursor->fence =
+					dma_fence_get_rcu(cursor->fence);
+			else
+				cursor->fence = NULL;
+		}
+
+		/* For the eventually next round */
+		first = true;
+	} while (read_seqcount_retry(&obj->seq, cursor->seq));
+
+	return cursor->fence;
+}
+EXPORT_SYMBOL_GPL(dma_resv_iter_walk_unlocked);
+
 /**
  * dma_resv_copy_fences - Copy all fences from src to dst.
  * @dst: the destination reservation object
diff --git a/include/linux/dma-resv.h b/include/linux/dma-resv.h
index 9100dd3dc21f..693d16117153 100644
--- a/include/linux/dma-resv.h
+++ b/include/linux/dma-resv.h
@@ -149,6 +149,90 @@ struct dma_resv {
 	struct dma_resv_list __rcu *fence;
 };
 
+/**
+ * struct dma_resv_iter - current position into the dma_resv fences
+ *
+ * Don't touch this directly in the driver, use the accessor function instead.
+ */
+struct dma_resv_iter {
+	/** @obj: The dma_resv object we iterate over */
+	struct dma_resv *obj;
+
+	/** @all_fences: If all fences should be returned */
+	bool all_fences;
+
+	/** @fence: the currently handled fence */
+	struct dma_fence *fence;
+
+	/** @seq: sequence number to check for modifications */
+	unsigned int seq;
+
+	/** @index: index into the shared fences */
+	unsigned int index;
+
+	/** @fences: the shared fences */
+	struct dma_resv_list *fences;
+
+	/** @is_first: true if this is the first returned fence */
+	bool is_first;
+};
+
+struct dma_fence *dma_resv_iter_walk_unlocked(struct dma_resv_iter *cursor,
+					      bool first);
+
+/**
+ * dma_resv_iter_begin - initialize a dma_resv_iter object
+ * @cursor: The dma_resv_iter object to initialize
+ * @obj: The dma_resv object which we want to iterator over
+ * @all_fences: If all fences should be returned or just the exclusive one
+ */
+static inline void dma_resv_iter_begin(struct dma_resv_iter *cursor,
+					struct dma_resv *obj,
+					bool all_fences)
+{
+	cursor->obj = obj;
+	cursor->all_fences = all_fences;
+	cursor->fence = NULL;
+}
+
+/**
+ * dma_resv_iter_end - cleanup a dma_resv_iter object
+ * @cursor: the dma_resv_iter object which should be cleaned up
+ *
+ * Make sure that the reference to the fence in the cursor is properly
+ * dropped.
+ */
+static inline void dma_resv_iter_end(struct dma_resv_iter *cursor)
+{
+	dma_fence_put(cursor->fence);
+}
+
+/**
+ * dma_resv_iter_is_exclusive - test if the current fence is the exclusive one
+ * @cursor: the cursor of the current position
+ *
+ * Returns true if the currently returned fence is the exclusive one.
+ */
+static inline bool dma_resv_iter_is_exclusive(struct dma_resv_iter *cursor)
+{
+	return cursor->index == -1;
+}
+
+/**
+ * dma_resv_for_each_fence_unlocked - unlocked fence iterator
+ * @cursor: a struct dma_resv_iter pointer
+ * @fence: the current fence
+ *
+ * Iterate over the fences in a struct dma_resv object without holding the
+ * dma_resv::lock. The RCU read side lock must be hold when using this, but can
+ * be dropped and re-taken as necessary inside the loop. The cursor needs to be
+ * initialized with dma_resv_iter_begin_unlocked() and cleaned up with
+ * dma_resv_iter_end_unlocked().
+ */
+#define dma_resv_for_each_fence_unlocked(cursor, fence)			\
+	for (fence = dma_resv_iter_walk_unlocked(cursor, true);		\
+	     fence; fence = dma_resv_iter_walk_unlocked(cursor, false))
+
 #define dma_resv_held(obj) lockdep_is_held(&(obj)->lock.base)
 #define dma_resv_assert_held(obj) lockdep_assert_held(&(obj)->lock.base)
 
-- 
2.25.1


  reply	other threads:[~2021-09-17 12:35 UTC|newest]

Thread overview: 116+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-17 12:34 Deploying new iterator interface for dma-buf Christian König
2021-09-17 12:34 ` [Intel-gfx] " Christian König
2021-09-17 12:34 ` Christian König [this message]
2021-09-17 12:34   ` [Intel-gfx] [PATCH 01/26] dma-buf: add dma_resv_for_each_fence_unlocked v2 Christian König
2021-09-17 13:23   ` Daniel Vetter
2021-09-17 13:23     ` [Intel-gfx] " Daniel Vetter
2021-09-20  8:43     ` Tvrtko Ursulin
2021-09-20 10:09       ` Christian König
2021-09-20 10:26         ` Tvrtko Ursulin
2021-09-17 12:34 ` [PATCH 02/26] dma-buf: add dma_resv_for_each_fence Christian König
2021-09-17 12:34   ` [Intel-gfx] " Christian König
2021-09-17 13:27   ` Daniel Vetter
2021-09-17 13:27     ` [Intel-gfx] " Daniel Vetter
2021-09-17 14:30     ` Daniel Vetter
2021-09-17 14:30       ` Daniel Vetter
2021-09-17 12:34 ` [PATCH 03/26] dma-buf: use new iterator in dma_resv_copy_fences Christian König
2021-09-17 12:34   ` [Intel-gfx] " Christian König
2021-09-17 14:35   ` Daniel Vetter
2021-09-17 14:35     ` [Intel-gfx] " Daniel Vetter
2021-09-20  7:23     ` Christian König
2021-09-20  7:23       ` [Intel-gfx] " Christian König
2021-09-17 12:34 ` [PATCH 04/26] dma-buf: use new iterator in dma_resv_get_fences v2 Christian König
2021-09-17 12:34   ` [Intel-gfx] " Christian König
2021-09-17 14:39   ` Daniel Vetter
2021-09-17 14:39     ` [Intel-gfx] " Daniel Vetter
2021-09-17 12:34 ` [PATCH 05/26] dma-buf: use new iterator in dma_resv_wait_timeout Christian König
2021-09-17 12:34   ` [Intel-gfx] " Christian König
2021-09-17 14:43   ` Daniel Vetter
2021-09-17 14:43     ` [Intel-gfx] " Daniel Vetter
2021-09-20  7:27     ` Christian König
2021-09-20  7:27       ` [Intel-gfx] " Christian König
2021-09-17 12:34 ` [PATCH 06/26] dma-buf: use new iterator in dma_resv_test_signaled Christian König
2021-09-17 12:34   ` [Intel-gfx] " Christian König
2021-09-17 14:45   ` Daniel Vetter
2021-09-17 14:45     ` [Intel-gfx] " Daniel Vetter
2021-09-17 12:34 ` [PATCH 07/26] drm/ttm: use the new iterator in ttm_bo_flush_all_fences Christian König
2021-09-17 12:34   ` [Intel-gfx] " Christian König
2021-09-17 14:50   ` Daniel Vetter
2021-09-17 14:50     ` [Intel-gfx] " Daniel Vetter
2021-09-17 12:34 ` [PATCH 08/26] drm/amdgpu: use the new iterator in amdgpu_sync_resv Christian König
2021-09-17 12:34   ` [Intel-gfx] " Christian König
2021-09-17 12:34 ` [PATCH 09/26] drm/amdgpu: use new iterator in amdgpu_ttm_bo_eviction_valuable Christian König
2021-09-17 12:34   ` [Intel-gfx] " Christian König
2021-09-17 12:34 ` [PATCH 10/26] drm/msm: use new iterator in msm_gem_describe Christian König
2021-09-17 12:34   ` [Intel-gfx] " Christian König
2021-09-17 12:34 ` [PATCH 11/26] drm/radeon: use new iterator in radeon_sync_resv Christian König
2021-09-17 12:34   ` [Intel-gfx] " Christian König
2021-09-17 12:34 ` [PATCH 12/26] drm/scheduler: use new iterator in drm_sched_job_add_implicit_dependencies v2 Christian König
2021-09-17 12:34   ` [Intel-gfx] " Christian König
2021-09-17 14:52   ` Daniel Vetter
2021-09-17 14:52     ` [Intel-gfx] " Daniel Vetter
2021-11-15 14:03   ` Sascha Hauer
2021-11-15 14:03     ` Sascha Hauer
2021-11-15 14:03     ` [Intel-gfx] " Sascha Hauer
2021-11-15 14:08     ` Daniel Vetter
2021-11-15 14:08       ` [Intel-gfx] " Daniel Vetter
2021-11-15 14:08       ` Daniel Vetter
2021-11-15 20:32       ` Christian König
2021-11-15 20:32         ` Christian König
2021-11-15 20:32         ` [Intel-gfx] " Christian König
2021-11-16  7:56       ` Sascha Hauer
2021-11-16  7:56         ` [Intel-gfx] " Sascha Hauer
2021-11-16  7:56         ` Sascha Hauer
2021-09-17 12:35 ` [PATCH 13/26] drm/i915: use the new iterator in i915_gem_busy_ioctl Christian König
2021-09-17 12:35   ` [Intel-gfx] " Christian König
2021-09-20  8:45   ` Tvrtko Ursulin
2021-09-20 10:13     ` Christian König
2021-09-20 10:33       ` Tvrtko Ursulin
2021-09-21  9:41         ` Christian König
2021-09-21 13:10           ` Tvrtko Ursulin
2021-09-17 12:35 ` [PATCH 14/26] drm/i915: use the new iterator in i915_sw_fence_await_reservation v3 Christian König
2021-09-17 12:35   ` [Intel-gfx] " Christian König
2021-09-20  8:45   ` Tvrtko Ursulin
2021-09-20  8:47     ` Tvrtko Ursulin
2021-09-20 10:14       ` Christian König
2021-09-17 12:35 ` [PATCH 15/26] drm/i915: use the new iterator in i915_request_await_object v2 Christian König
2021-09-17 12:35   ` [Intel-gfx] " Christian König
2021-09-17 12:35 ` [PATCH 16/26] drm/i915: use new iterator in i915_gem_object_wait_reservation v2 Christian König
2021-09-17 12:35   ` [Intel-gfx] " Christian König
2021-09-20 10:00   ` Tvrtko Ursulin
2021-09-21 17:35     ` Christian König
2021-09-17 12:35 ` [PATCH 17/26] drm/i915: use new iterator in i915_gem_object_wait_priority v2 Christian König
2021-09-17 12:35   ` [Intel-gfx] " Christian König
2021-09-17 12:35 ` [PATCH 18/26] drm/i915: use new iterator in i915_gem_object_last_write_engine v2 Christian König
2021-09-17 12:35   ` [Intel-gfx] " Christian König
2021-09-17 12:35 ` [PATCH 19/26] drm/i915: use new cursor in intel_prepare_plane_fb v2 Christian König
2021-09-17 12:35   ` [Intel-gfx] " Christian König
2021-09-17 12:35 ` [PATCH 20/26] drm: use new iterator in drm_gem_fence_array_add_implicit v2 Christian König
2021-09-17 12:35   ` [Intel-gfx] " Christian König
2021-09-17 14:53   ` Daniel Vetter
2021-09-17 14:53     ` [Intel-gfx] " Daniel Vetter
2021-09-20  7:31     ` Christian König
2021-09-20  7:31       ` [Intel-gfx] " Christian König
2021-09-17 12:35 ` [PATCH 21/26] drm: use new iterator in drm_gem_plane_helper_prepare_fb v2 Christian König
2021-09-17 12:35   ` [Intel-gfx] " Christian König
2021-09-17 14:55   ` Daniel Vetter
2021-09-17 14:55     ` [Intel-gfx] " Daniel Vetter
2021-09-20  7:35     ` Christian König
2021-09-20  7:35       ` [Intel-gfx] " Christian König
2021-09-17 12:35 ` [PATCH 22/26] drm/nouveau: use the new iterator in nouveau_fence_sync Christian König
2021-09-17 12:35   ` [Intel-gfx] " Christian König
2021-09-17 12:35 ` [PATCH 23/26] drm/nouveau: use the new interator in nv50_wndw_prepare_fb v2 Christian König
2021-09-17 12:35   ` [Intel-gfx] " Christian König
2021-09-17 12:35 ` [PATCH 24/26] drm/etnaviv: use new iterator in etnaviv_gem_describe Christian König
2021-09-17 12:35   ` [Intel-gfx] " Christian König
2021-09-17 12:35 ` [PATCH 25/26] drm/etnaviv: replace dma_resv_get_excl_unlocked Christian König
2021-09-17 12:35   ` [Intel-gfx] " Christian König
2021-09-17 12:35 ` [PATCH 26/26] dma-buf: nuke dma_resv_get_excl_unlocked Christian König
2021-09-17 12:35   ` [Intel-gfx] " Christian König
2021-09-17 14:56   ` Daniel Vetter
2021-09-17 14:56     ` [Intel-gfx] " Daniel Vetter
2021-09-17 14:01 ` [Intel-gfx] ✗ Fi.CI.CHECKPATCH: warning for series starting with [01/26] dma-buf: add dma_resv_for_each_fence_unlocked v2 Patchwork
2021-09-17 14:29 ` [Intel-gfx] ✓ Fi.CI.BAT: success " Patchwork
2021-09-17 15:43 ` [Intel-gfx] ✗ Fi.CI.IGT: failure " Patchwork
  -- strict thread matches above, loose matches on Subject: below --
2021-09-16 11:30 Deploying new iterator interface for dma-buf Christian König
2021-09-16 11:30 ` [PATCH 01/26] dma-buf: add dma_resv_for_each_fence_unlocked v2 Christian König
2021-09-16 12:15   ` Daniel Vetter

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