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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
Cc: daniel@ffwll.ch, intel-gfx@lists.freedesktop.org
Subject: [PATCH 01/26] dma-buf: add dma_resv_for_each_fence_unlocked
Date: Mon, 13 Sep 2021 15:16:42 +0200	[thread overview]
Message-ID: <20210913131707.45639-2-christian.koenig@amd.com> (raw)
In-Reply-To: <20210913131707.45639-1-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.

Signed-off-by: Christian König <christian.koenig@amd.com>
---
 drivers/dma-buf/dma-resv.c | 63 ++++++++++++++++++++++++++++++++++++++
 include/linux/dma-resv.h   | 36 ++++++++++++++++++++++
 2 files changed, 99 insertions(+)

diff --git a/drivers/dma-buf/dma-resv.c b/drivers/dma-buf/dma-resv.c
index 84fbe60629e3..213a9b7251ca 100644
--- a/drivers/dma-buf/dma-resv.c
+++ b/drivers/dma-buf/dma-resv.c
@@ -323,6 +323,69 @@ void dma_resv_add_excl_fence(struct dma_resv *obj, struct dma_fence *fence)
 }
 EXPORT_SYMBOL(dma_resv_add_excl_fence);
 
+/**
+ * dma_resv_walk_unlocked - walk over fences in a dma_resv obj
+ * @obj: the dma_resv object
+ * @cursor: cursor to record the current position
+ * @all_fences: true returns also the shared fences
+ * @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 iterator is started over again.
+ */
+struct dma_fence *dma_resv_walk_unlocked(struct dma_resv *obj,
+					 struct dma_resv_cursor *cursor,
+					 bool all_fences, bool first)
+{
+	struct dma_fence *fence = NULL;
+
+	do {
+		/* Drop the reference from the previous round */
+		dma_fence_put(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->is_exclusive = true;
+
+			fence = dma_resv_excl_fence(obj);
+			if (fence && test_bit(DMA_FENCE_FLAG_SIGNALED_BIT,
+					      &fence->flags))
+				fence = NULL;
+		} else {
+			fence = NULL;
+		}
+
+		if (fence) {
+			fence = dma_fence_get_rcu(fence);
+		} else if (all_fences && cursor->fences) {
+			struct dma_resv_list *fences = cursor->fences;
+
+			cursor->is_exclusive = false;
+			while (++cursor->index < fences->shared_count) {
+				fence = rcu_dereference(fences->shared[
+							cursor->index]);
+				if (!test_bit(DMA_FENCE_FLAG_SIGNALED_BIT,
+					      &fence->flags))
+					break;
+			}
+			if (cursor->index < fences->shared_count)
+				fence = dma_fence_get_rcu(fence);
+			else
+				fence = NULL;
+		}
+
+		/* For the eventually next round */
+		first = true;
+	} while (read_seqcount_retry(&obj->seq, cursor->seq));
+
+	return fence;
+}
+EXPORT_SYMBOL_GPL(dma_resv_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..f5b91c292ee0 100644
--- a/include/linux/dma-resv.h
+++ b/include/linux/dma-resv.h
@@ -149,6 +149,39 @@ struct dma_resv {
 	struct dma_resv_list __rcu *fence;
 };
 
+/**
+ * struct dma_resv_cursor - current position into the dma_resv fences
+ * @seq: sequence number to check
+ * @index: index into the shared fences
+ * @shared: the shared fences
+ * @is_first: true if this is the first returned fence
+ * @is_exclusive: if the current fence is the exclusive one
+ */
+struct dma_resv_cursor {
+	unsigned int seq;
+	unsigned int index;
+	struct dma_resv_list *fences;
+	bool is_first;
+	bool is_exclusive;
+};
+
+/**
+ * dma_resv_for_each_fence_unlocked - fence iterator
+ * @obj: a dma_resv object pointer
+ * @cursor: a struct dma_resv_cursor pointer
+ * @all_fences: true if all fences should be returned
+ * @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. @all_fences controls
+ * if the shared fences are returned as well.
+ */
+#define dma_resv_for_each_fence_unlocked(obj, cursor, all_fences, fence)    \
+	for (fence = dma_resv_walk_unlocked(obj, cursor, all_fences, true); \
+	     fence; dma_fence_put(fence),				    \
+	     fence = dma_resv_walk_unlocked(obj, cursor, all_fences, false))
+
 #define dma_resv_held(obj) lockdep_is_held(&(obj)->lock.base)
 #define dma_resv_assert_held(obj) lockdep_assert_held(&(obj)->lock.base)
 
@@ -366,6 +399,9 @@ void dma_resv_fini(struct dma_resv *obj);
 int dma_resv_reserve_shared(struct dma_resv *obj, unsigned int num_fences);
 void dma_resv_add_shared_fence(struct dma_resv *obj, struct dma_fence *fence);
 void dma_resv_add_excl_fence(struct dma_resv *obj, struct dma_fence *fence);
+struct dma_fence *dma_resv_walk_unlocked(struct dma_resv *obj,
+					 struct dma_resv_cursor *cursor,
+					 bool first, bool all_fences);
 int dma_resv_get_fences(struct dma_resv *obj, struct dma_fence **pfence_excl,
 			unsigned *pshared_count, struct dma_fence ***pshared);
 int dma_resv_copy_fences(struct dma_resv *dst, struct dma_resv *src);
-- 
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
Cc: daniel@ffwll.ch, intel-gfx@lists.freedesktop.org
Subject: [Intel-gfx] [PATCH 01/26] dma-buf: add dma_resv_for_each_fence_unlocked
Date: Mon, 13 Sep 2021 15:16:42 +0200	[thread overview]
Message-ID: <20210913131707.45639-2-christian.koenig@amd.com> (raw)
In-Reply-To: <20210913131707.45639-1-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.

Signed-off-by: Christian König <christian.koenig@amd.com>
---
 drivers/dma-buf/dma-resv.c | 63 ++++++++++++++++++++++++++++++++++++++
 include/linux/dma-resv.h   | 36 ++++++++++++++++++++++
 2 files changed, 99 insertions(+)

diff --git a/drivers/dma-buf/dma-resv.c b/drivers/dma-buf/dma-resv.c
index 84fbe60629e3..213a9b7251ca 100644
--- a/drivers/dma-buf/dma-resv.c
+++ b/drivers/dma-buf/dma-resv.c
@@ -323,6 +323,69 @@ void dma_resv_add_excl_fence(struct dma_resv *obj, struct dma_fence *fence)
 }
 EXPORT_SYMBOL(dma_resv_add_excl_fence);
 
+/**
+ * dma_resv_walk_unlocked - walk over fences in a dma_resv obj
+ * @obj: the dma_resv object
+ * @cursor: cursor to record the current position
+ * @all_fences: true returns also the shared fences
+ * @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 iterator is started over again.
+ */
+struct dma_fence *dma_resv_walk_unlocked(struct dma_resv *obj,
+					 struct dma_resv_cursor *cursor,
+					 bool all_fences, bool first)
+{
+	struct dma_fence *fence = NULL;
+
+	do {
+		/* Drop the reference from the previous round */
+		dma_fence_put(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->is_exclusive = true;
+
+			fence = dma_resv_excl_fence(obj);
+			if (fence && test_bit(DMA_FENCE_FLAG_SIGNALED_BIT,
+					      &fence->flags))
+				fence = NULL;
+		} else {
+			fence = NULL;
+		}
+
+		if (fence) {
+			fence = dma_fence_get_rcu(fence);
+		} else if (all_fences && cursor->fences) {
+			struct dma_resv_list *fences = cursor->fences;
+
+			cursor->is_exclusive = false;
+			while (++cursor->index < fences->shared_count) {
+				fence = rcu_dereference(fences->shared[
+							cursor->index]);
+				if (!test_bit(DMA_FENCE_FLAG_SIGNALED_BIT,
+					      &fence->flags))
+					break;
+			}
+			if (cursor->index < fences->shared_count)
+				fence = dma_fence_get_rcu(fence);
+			else
+				fence = NULL;
+		}
+
+		/* For the eventually next round */
+		first = true;
+	} while (read_seqcount_retry(&obj->seq, cursor->seq));
+
+	return fence;
+}
+EXPORT_SYMBOL_GPL(dma_resv_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..f5b91c292ee0 100644
--- a/include/linux/dma-resv.h
+++ b/include/linux/dma-resv.h
@@ -149,6 +149,39 @@ struct dma_resv {
 	struct dma_resv_list __rcu *fence;
 };
 
+/**
+ * struct dma_resv_cursor - current position into the dma_resv fences
+ * @seq: sequence number to check
+ * @index: index into the shared fences
+ * @shared: the shared fences
+ * @is_first: true if this is the first returned fence
+ * @is_exclusive: if the current fence is the exclusive one
+ */
+struct dma_resv_cursor {
+	unsigned int seq;
+	unsigned int index;
+	struct dma_resv_list *fences;
+	bool is_first;
+	bool is_exclusive;
+};
+
+/**
+ * dma_resv_for_each_fence_unlocked - fence iterator
+ * @obj: a dma_resv object pointer
+ * @cursor: a struct dma_resv_cursor pointer
+ * @all_fences: true if all fences should be returned
+ * @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. @all_fences controls
+ * if the shared fences are returned as well.
+ */
+#define dma_resv_for_each_fence_unlocked(obj, cursor, all_fences, fence)    \
+	for (fence = dma_resv_walk_unlocked(obj, cursor, all_fences, true); \
+	     fence; dma_fence_put(fence),				    \
+	     fence = dma_resv_walk_unlocked(obj, cursor, all_fences, false))
+
 #define dma_resv_held(obj) lockdep_is_held(&(obj)->lock.base)
 #define dma_resv_assert_held(obj) lockdep_assert_held(&(obj)->lock.base)
 
@@ -366,6 +399,9 @@ void dma_resv_fini(struct dma_resv *obj);
 int dma_resv_reserve_shared(struct dma_resv *obj, unsigned int num_fences);
 void dma_resv_add_shared_fence(struct dma_resv *obj, struct dma_fence *fence);
 void dma_resv_add_excl_fence(struct dma_resv *obj, struct dma_fence *fence);
+struct dma_fence *dma_resv_walk_unlocked(struct dma_resv *obj,
+					 struct dma_resv_cursor *cursor,
+					 bool first, bool all_fences);
 int dma_resv_get_fences(struct dma_resv *obj, struct dma_fence **pfence_excl,
 			unsigned *pshared_count, struct dma_fence ***pshared);
 int dma_resv_copy_fences(struct dma_resv *dst, struct dma_resv *src);
-- 
2.25.1


  reply	other threads:[~2021-09-13 13:29 UTC|newest]

Thread overview: 69+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-13 13:16 Deploying new iterator interface for dma-buf Christian König
2021-09-13 13:16 ` [Intel-gfx] " Christian König
2021-09-13 13:16 ` Christian König [this message]
2021-09-13 13:16   ` [Intel-gfx] [PATCH 01/26] dma-buf: add dma_resv_for_each_fence_unlocked Christian König
2021-09-14 10:53   ` Tvrtko Ursulin
2021-09-14 11:25     ` Christian König
2021-09-14 13:07       ` Tvrtko Ursulin
2021-09-15 10:46         ` Christian König
2021-09-13 13:16 ` [PATCH 02/26] dma-buf: add dma_resv_for_each_fence Christian König
2021-09-13 13:16   ` [Intel-gfx] " Christian König
2021-09-13 13:16 ` [PATCH 03/26] dma-buf: use new iterator in dma_resv_copy_fences Christian König
2021-09-13 13:16   ` [Intel-gfx] " Christian König
2021-09-13 13:16 ` [PATCH 04/26] dma-buf: use new iterator in dma_resv_get_fences v2 Christian König
2021-09-13 13:16   ` [Intel-gfx] " Christian König
2021-09-13 13:16 ` [PATCH 05/26] dma-buf: use new iterator in dma_resv_wait_timeout Christian König
2021-09-13 13:16   ` [Intel-gfx] " Christian König
2021-09-13 13:16 ` [PATCH 06/26] dma-buf: use new iterator in dma_resv_test_signaled Christian König
2021-09-13 13:16   ` [Intel-gfx] " Christian König
2021-09-13 13:16 ` [PATCH 07/26] drm/ttm: use the new iterator in ttm_bo_flush_all_fences Christian König
2021-09-13 13:16   ` [Intel-gfx] " Christian König
2021-09-13 13:16 ` [PATCH 08/26] drm/amdgpu: use the new iterator in amdgpu_sync_resv Christian König
2021-09-13 13:16   ` [Intel-gfx] " Christian König
2021-09-13 13:16 ` [PATCH 09/26] drm/amdgpu: use new iterator in amdgpu_ttm_bo_eviction_valuable Christian König
2021-09-13 13:16   ` [Intel-gfx] " Christian König
2021-09-13 13:16 ` [PATCH 10/26] drm/msm: use new iterator in msm_gem_describe Christian König
2021-09-13 13:16   ` [Intel-gfx] " Christian König
2021-09-13 13:16 ` [PATCH 11/26] drm/radeon: use new iterator in radeon_sync_resv Christian König
2021-09-13 13:16   ` [Intel-gfx] " Christian König
2021-09-13 13:16 ` [PATCH 12/26] drm/scheduler: use new iterator in drm_sched_job_add_implicit_dependencies Christian König
2021-09-13 13:16   ` [Intel-gfx] " Christian König
2021-09-13 13:16 ` [PATCH 13/26] drm/i915: use the new iterator in i915_gem_busy_ioctl Christian König
2021-09-13 13:16   ` [Intel-gfx] " Christian König
2021-09-14 13:18   ` Tvrtko Ursulin
2021-09-13 13:16 ` [PATCH 14/26] drm/i915: use the new iterator in i915_sw_fence_await_reservation Christian König
2021-09-13 13:16   ` [Intel-gfx] " Christian König
2021-09-13 13:16 ` [PATCH 15/26] drm/i915: use the new iterator in i915_request_await_object Christian König
2021-09-13 13:16   ` [Intel-gfx] " Christian König
2021-09-14 10:26   ` Tvrtko Ursulin
2021-09-14 10:39     ` Christian König
2021-09-14 10:59       ` Tvrtko Ursulin
2021-09-13 13:16 ` [PATCH 16/26] drm/i915: use new iterator in i915_gem_object_wait_reservation Christian König
2021-09-13 13:16   ` [Intel-gfx] " Christian König
2021-09-13 13:16 ` [PATCH 17/26] drm/i915: use new iterator in i915_gem_object_wait_priority Christian König
2021-09-13 13:16   ` [Intel-gfx] " Christian König
2021-09-14 12:42   ` Tvrtko Ursulin
2021-09-13 13:16 ` [PATCH 18/26] drm/i915: use new iterator in i915_gem_object_last_write_engine Christian König
2021-09-13 13:16   ` [Intel-gfx] " Christian König
2021-09-14 12:27   ` Tvrtko Ursulin
2021-09-14 12:32     ` Christian König
2021-09-14 12:47       ` Tvrtko Ursulin
2021-09-15 11:19         ` Christian König
2021-09-13 13:17 ` [PATCH 19/26] drm/i915: use new cursor in intel_prepare_plane_fb Christian König
2021-09-13 13:17   ` [Intel-gfx] " Christian König
2021-09-13 13:17 ` [PATCH 20/26] drm: use new iterator in drm_gem_fence_array_add_implicit Christian König
2021-09-13 13:17   ` [Intel-gfx] " Christian König
2021-09-13 13:17 ` [PATCH 21/26] drm: use new iterator in drm_gem_plane_helper_prepare_fb Christian König
2021-09-13 13:17   ` [Intel-gfx] " Christian König
2021-09-13 13:17 ` [PATCH 22/26] drm/nouveau: use the new iterator in nouveau_fence_sync Christian König
2021-09-13 13:17   ` [Intel-gfx] " Christian König
2021-09-13 13:17 ` [PATCH 23/26] drm/nouveau: use the new interator in nv50_wndw_prepare_fb Christian König
2021-09-13 13:17   ` [Intel-gfx] " Christian König
2021-09-13 13:17 ` [PATCH 24/26] drm/etnaviv: use new iterator in etnaviv_gem_describe Christian König
2021-09-13 13:17   ` [Intel-gfx] " Christian König
2021-09-13 13:17 ` [PATCH 25/26] drm/etnaviv: replace dma_resv_get_excl_unlocked Christian König
2021-09-13 13:17   ` [Intel-gfx] " Christian König
2021-09-13 13:17 ` [PATCH 26/26] dma-buf: nuke dma_resv_get_excl_unlocked Christian König
2021-09-13 13:17   ` [Intel-gfx] " Christian König
2021-09-13 14:25 ` [Intel-gfx] ✗ Fi.CI.CHECKPATCH: warning for series starting with [01/26] dma-buf: add dma_resv_for_each_fence_unlocked Patchwork
2021-09-13 14:57 ` [Intel-gfx] ✗ Fi.CI.BAT: failure " Patchwork

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