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, tvrtko.ursulin@linux.intel.com
Subject: [PATCH 04/26] dma-buf: use new iterator in dma_resv_get_fences v2
Date: Thu, 16 Sep 2021 13:30:20 +0200 [thread overview]
Message-ID: <20210916113042.3631-5-christian.koenig@amd.com> (raw)
In-Reply-To: <20210916113042.3631-1-christian.koenig@amd.com>
This makes the function much simpler since the complex
retry logic is now handled elsewhere.
v2: use sizeof(void*) instead
Signed-off-by: Christian König <christian.koenig@amd.com>
---
drivers/dma-buf/dma-resv.c | 110 +++++++++++++------------------------
1 file changed, 37 insertions(+), 73 deletions(-)
diff --git a/drivers/dma-buf/dma-resv.c b/drivers/dma-buf/dma-resv.c
index 91c040cb7d63..bba328475304 100644
--- a/drivers/dma-buf/dma-resv.c
+++ b/drivers/dma-buf/dma-resv.c
@@ -491,99 +491,63 @@ EXPORT_SYMBOL(dma_resv_copy_fences);
* dma_resv_get_fences - Get an object's shared and exclusive
* fences without update side lock held
* @obj: the reservation object
- * @pfence_excl: the returned exclusive fence (or NULL)
- * @pshared_count: the number of shared fences returned
- * @pshared: the array of shared fence ptrs returned (array is krealloc'd to
+ * @fence_excl: the returned exclusive fence (or NULL)
+ * @shared_count: the number of shared fences returned
+ * @shared: the array of shared fence ptrs returned (array is krealloc'd to
* the required size, and must be freed by caller)
*
* Retrieve all fences from the reservation object. If the pointer for the
* exclusive fence is not specified the fence is put into the array of the
* shared fences as well. Returns either zero or -ENOMEM.
*/
-int dma_resv_get_fences(struct dma_resv *obj, struct dma_fence **pfence_excl,
- unsigned int *pshared_count,
- struct dma_fence ***pshared)
+int dma_resv_get_fences(struct dma_resv *obj, struct dma_fence **fence_excl,
+ unsigned int *shared_count, struct dma_fence ***shared)
{
- struct dma_fence **shared = NULL;
- struct dma_fence *fence_excl;
- unsigned int shared_count;
- int ret = 1;
-
- do {
- struct dma_resv_list *fobj;
- unsigned int i, seq;
- size_t sz = 0;
-
- shared_count = i = 0;
-
- rcu_read_lock();
- seq = read_seqcount_begin(&obj->seq);
-
- fence_excl = dma_resv_excl_fence(obj);
- if (fence_excl && !dma_fence_get_rcu(fence_excl))
- goto unlock;
+ struct dma_resv_iter cursor;
+ struct dma_fence *fence;
- fobj = dma_resv_shared_list(obj);
- if (fobj)
- sz += sizeof(*shared) * fobj->shared_max;
+ *shared_count = 0;
+ *shared = NULL;
- if (!pfence_excl && fence_excl)
- sz += sizeof(*shared);
+ if (fence_excl)
+ *fence_excl = NULL;
- if (sz) {
- struct dma_fence **nshared;
+ rcu_read_lock();
+ dma_resv_for_each_fence_unlocked(obj, &cursor, true, fence) {
- nshared = krealloc(shared, sz,
- GFP_NOWAIT | __GFP_NOWARN);
- if (!nshared) {
- rcu_read_unlock();
+ if (cursor.is_first) {
+ unsigned int count;
- dma_fence_put(fence_excl);
- fence_excl = NULL;
+ while (*shared_count)
+ dma_fence_put((*shared)[--(*shared_count)]);
- nshared = krealloc(shared, sz, GFP_KERNEL);
- if (nshared) {
- shared = nshared;
- continue;
- }
+ if (fence_excl)
+ dma_fence_put(*fence_excl);
- ret = -ENOMEM;
- break;
- }
- shared = nshared;
- shared_count = fobj ? fobj->shared_count : 0;
- for (i = 0; i < shared_count; ++i) {
- shared[i] = rcu_dereference(fobj->shared[i]);
- if (!dma_fence_get_rcu(shared[i]))
- break;
- }
- }
+ count = cursor.fences ? cursor.fences->shared_count : 0;
+ count += fence_excl ? 0 : 1;
+ rcu_read_unlock();
- if (i != shared_count || read_seqcount_retry(&obj->seq, seq)) {
- while (i--)
- dma_fence_put(shared[i]);
- dma_fence_put(fence_excl);
- goto unlock;
+ /* Eventually re-allocate the array */
+ *shared = krealloc_array(*shared, count,
+ sizeof(void *),
+ GFP_KERNEL);
+ if (count && !*shared)
+ return -ENOMEM;
+ rcu_read_lock();
}
- ret = 0;
-unlock:
- rcu_read_unlock();
- } while (ret);
-
- if (pfence_excl)
- *pfence_excl = fence_excl;
- else if (fence_excl)
- shared[shared_count++] = fence_excl;
+ if (dma_resv_iter_is_exclusive(&cursor) && fence_excl)
+ *fence_excl = fence;
+ else
+ (*shared)[(*shared_count)++] = fence;
- if (!shared_count) {
- kfree(shared);
- shared = NULL;
+ /* Don't drop the reference */
+ fence = NULL;
}
+ rcu_read_unlock();
- *pshared_count = shared_count;
- *pshared = shared;
- return ret;
+ return 0;
}
EXPORT_SYMBOL_GPL(dma_resv_get_fences);
--
2.25.1
next prev parent reply other threads:[~2021-09-16 11:30 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
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
2021-09-16 11:30 ` [PATCH 02/26] dma-buf: add dma_resv_for_each_fence Christian König
2021-09-16 11:30 ` [PATCH 03/26] dma-buf: use new iterator in dma_resv_copy_fences Christian König
2021-09-16 11:30 ` Christian König [this message]
2021-09-16 11:30 ` [PATCH 05/26] dma-buf: use new iterator in dma_resv_wait_timeout Christian König
2021-09-16 11:30 ` [PATCH 06/26] dma-buf: use new iterator in dma_resv_test_signaled Christian König
2021-09-16 11:30 ` [PATCH 07/26] drm/ttm: use the new iterator in ttm_bo_flush_all_fences Christian König
2021-09-16 11:30 ` [PATCH 08/26] drm/amdgpu: use the new iterator in amdgpu_sync_resv Christian König
2021-09-16 11:30 ` [PATCH 09/26] drm/amdgpu: use new iterator in amdgpu_ttm_bo_eviction_valuable Christian König
2021-09-16 11:30 ` [PATCH 10/26] drm/msm: use new iterator in msm_gem_describe Christian König
2021-09-16 11:30 ` [PATCH 11/26] drm/radeon: use new iterator in radeon_sync_resv Christian König
2021-09-16 11:30 ` [PATCH 12/26] drm/scheduler: use new iterator in drm_sched_job_add_implicit_dependencies v2 Christian König
2021-09-16 11:30 ` [PATCH 13/26] drm/i915: use the new iterator in i915_gem_busy_ioctl Christian König
2021-09-16 11:30 ` [PATCH 14/26] drm/i915: use the new iterator in i915_sw_fence_await_reservation v2 Christian König
2021-09-16 11:30 ` [PATCH 15/26] drm/i915: use the new iterator in i915_request_await_object v2 Christian König
2021-09-16 11:30 ` [PATCH 16/26] drm/i915: use new iterator in i915_gem_object_wait_reservation v2 Christian König
2021-09-16 11:30 ` [PATCH 17/26] drm/i915: use new iterator in i915_gem_object_wait_priority v2 Christian König
2021-09-16 11:30 ` [PATCH 18/26] drm/i915: use new iterator in i915_gem_object_last_write_engine v2 Christian König
2021-09-16 11:30 ` [PATCH 19/26] drm/i915: use new cursor in intel_prepare_plane_fb v2 Christian König
2021-09-16 11:30 ` [PATCH 20/26] drm: use new iterator in drm_gem_fence_array_add_implicit v2 Christian König
2021-09-16 11:30 ` [PATCH 21/26] drm: use new iterator in drm_gem_plane_helper_prepare_fb v2 Christian König
2021-09-16 11:30 ` [PATCH 22/26] drm/nouveau: use the new iterator in nouveau_fence_sync Christian König
2021-09-16 11:30 ` [PATCH 23/26] drm/nouveau: use the new interator in nv50_wndw_prepare_fb v2 Christian König
2021-09-16 11:30 ` [PATCH 24/26] drm/etnaviv: use new iterator in etnaviv_gem_describe Christian König
2021-09-16 11:30 ` [PATCH 25/26] drm/etnaviv: replace dma_resv_get_excl_unlocked Christian König
2021-09-16 11:30 ` [PATCH 26/26] dma-buf: nuke dma_resv_get_excl_unlocked Christian König
-- strict thread matches above, loose matches on Subject: below --
2021-09-22 9:10 Deploying new iterator interface for dma-buf Christian König
2021-09-22 9:10 ` [PATCH 04/26] dma-buf: use new iterator in dma_resv_get_fences v2 Christian König
2021-09-21 17:36 [PATCH 01/26] dma-buf: add dma_resv_for_each_fence_unlocked v3 Christian König
2021-09-21 17:36 ` [PATCH 04/26] dma-buf: use new iterator in dma_resv_get_fences v2 Christian König
2021-09-17 12:34 Deploying new iterator interface for dma-buf 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 14:39 ` Daniel Vetter
2021-09-13 13:16 Deploying new iterator interface for dma-buf Christian König
2021-09-13 13:16 ` [PATCH 04/26] dma-buf: use new iterator in dma_resv_get_fences v2 Christian König
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