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[91.14.161.181]) by smtp.gmail.com with ESMTPSA id c17sm3803674wrn.54.2021.09.16.04.30.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 16 Sep 2021 04:30:48 -0700 (PDT) From: " =?utf-8?q?Christian_K=C3=B6nig?= " X-Google-Original-From: =?utf-8?q?Christian_K=C3=B6nig?= 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 Date: Thu, 16 Sep 2021 13:30:19 +0200 Message-Id: <20210916113042.3631-4-christian.koenig@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210916113042.3631-1-christian.koenig@amd.com> References: <20210916113042.3631-1-christian.koenig@amd.com> MIME-Version: 1.0 X-Mailman-Approved-At: Thu, 16 Sep 2021 12:00:17 +0000 Subject: [Intel-gfx] [PATCH 03/26] dma-buf: use new iterator in dma_resv_copy_fences X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" This makes the function much simpler since the complex retry logic is now handled else where. Signed-off-by: Christian König --- drivers/dma-buf/dma-resv.c | 81 +++++++++++++++----------------------- 1 file changed, 32 insertions(+), 49 deletions(-) diff --git a/drivers/dma-buf/dma-resv.c b/drivers/dma-buf/dma-resv.c index bbf36a08ced0..91c040cb7d63 100644 --- a/drivers/dma-buf/dma-resv.c +++ b/drivers/dma-buf/dma-resv.c @@ -431,74 +431,57 @@ EXPORT_SYMBOL_GPL(dma_resv_walk_unlocked); */ int dma_resv_copy_fences(struct dma_resv *dst, struct dma_resv *src) { - struct dma_resv_list *src_list, *dst_list; - struct dma_fence *old, *new; - unsigned int i; + struct dma_resv_iter cursor; + struct dma_resv_list *list; + struct dma_fence *f, *excl; dma_resv_assert_held(dst); - rcu_read_lock(); - src_list = dma_resv_shared_list(src); + list = NULL; + excl = NULL; -retry: - if (src_list) { - unsigned int shared_count = src_list->shared_count; + rcu_read_lock(); + dma_resv_for_each_fence_unlocked(dst, &cursor, true, f) { - rcu_read_unlock(); + if (cursor.is_first) { + dma_resv_list_free(list); + dma_fence_put(excl); - dst_list = dma_resv_list_alloc(shared_count); - if (!dst_list) - return -ENOMEM; + if (cursor.fences) { + unsigned int cnt = cursor.fences->shared_count; - rcu_read_lock(); - src_list = dma_resv_shared_list(src); - if (!src_list || src_list->shared_count > shared_count) { - kfree(dst_list); - goto retry; - } + rcu_read_unlock(); + list = dma_resv_list_alloc(cnt); + if (!list) + return -ENOMEM; - dst_list->shared_count = 0; - for (i = 0; i < src_list->shared_count; ++i) { - struct dma_fence __rcu **dst; - struct dma_fence *fence; + list->shared_count = 0; + rcu_read_lock(); - fence = rcu_dereference(src_list->shared[i]); - if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, - &fence->flags)) - continue; - - if (!dma_fence_get_rcu(fence)) { - dma_resv_list_free(dst_list); - src_list = dma_resv_shared_list(src); - goto retry; + } else { + list = NULL; } + excl = NULL; + } - if (dma_fence_is_signaled(fence)) { - dma_fence_put(fence); - continue; - } + if (dma_resv_iter_is_exclusive(&cursor)) + excl = f; + else + RCU_INIT_POINTER(list->shared[list->shared_count++], f); - dst = &dst_list->shared[dst_list->shared_count++]; - rcu_assign_pointer(*dst, fence); - } - } else { - dst_list = NULL; + /* Don't drop the reference */ + f = NULL; } - new = dma_fence_get_rcu_safe(&src->fence_excl); rcu_read_unlock(); - src_list = dma_resv_shared_list(dst); - old = dma_resv_excl_fence(dst); - write_seqcount_begin(&dst->seq); - /* write_seqcount_begin provides the necessary memory barrier */ - RCU_INIT_POINTER(dst->fence_excl, new); - RCU_INIT_POINTER(dst->fence, dst_list); + excl = rcu_replace_pointer(dst->fence_excl, excl, dma_resv_held(dst)); + list = rcu_replace_pointer(dst->fence, list, dma_resv_held(dst)); write_seqcount_end(&dst->seq); - dma_resv_list_free(src_list); - dma_fence_put(old); + dma_resv_list_free(list); + dma_fence_put(excl); return 0; }