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[134.134.139.72]) by smtp.gmail.com with ESMTPSA id o16sm3145288pfu.75.2021.06.10.14.09.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 10 Jun 2021 14:09:51 -0700 (PDT) From: Jason Ekstrand To: dri-devel@lists.freedesktop.org Subject: [PATCH 5/6] RFC: dma-buf: Add an extra fence to dma_resv_get_singleton_unlocked Date: Thu, 10 Jun 2021 16:09:24 -0500 Message-Id: <20210610210925.642582-6-jason@jlekstrand.net> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210610210925.642582-1-jason@jlekstrand.net> References: <20210610210925.642582-1-jason@jlekstrand.net> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Daniel Vetter , =?UTF-8?q?Christian=20K=C3=B6nig?= , Jason Ekstrand Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" For dma-buf sync_file import, we want to get all the fences on a dma_resv plus one more. We could wrap the fence we get back in an array fence or we could make dma_resv_get_singleton_unlocked take "one more" to make this case easier. Signed-off-by: Jason Ekstrand Reviewed-by: Daniel Vetter Cc: Christian König Cc: Maarten Lankhorst --- drivers/dma-buf/dma-buf.c | 2 +- drivers/dma-buf/dma-resv.c | 23 +++++++++++++++++++++-- include/linux/dma-resv.h | 3 ++- 3 files changed, 24 insertions(+), 4 deletions(-) diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c index 41b14b53cdda3..831828d71b646 100644 --- a/drivers/dma-buf/dma-buf.c +++ b/drivers/dma-buf/dma-buf.c @@ -389,7 +389,7 @@ static long dma_buf_export_sync_file(struct dma_buf *dmabuf, return fd; if (arg.flags & DMA_BUF_SYNC_WRITE) { - fence = dma_resv_get_singleton(dmabuf->resv); + fence = dma_resv_get_singleton(dmabuf->resv, NULL); if (IS_ERR(fence)) { ret = PTR_ERR(fence); goto err_put_fd; diff --git a/drivers/dma-buf/dma-resv.c b/drivers/dma-buf/dma-resv.c index 1b26aa7e5d81c..7c48c23239b4b 100644 --- a/drivers/dma-buf/dma-resv.c +++ b/drivers/dma-buf/dma-resv.c @@ -504,6 +504,7 @@ EXPORT_SYMBOL_GPL(dma_resv_get_fences); /** * dma_resv_get_singleton - get a single fence for the dma_resv object * @obj: the reservation object + * @extra: extra fence to add to the resulting array * * Get a single fence representing all unsignaled fences in the dma_resv object * plus the given extra fence. If we got only one fence return a new @@ -512,7 +513,8 @@ EXPORT_SYMBOL_GPL(dma_resv_get_fences); * RETURNS * The singleton dma_fence on success or an ERR_PTR on failure */ -struct dma_fence *dma_resv_get_singleton(struct dma_resv *obj) +struct dma_fence *dma_resv_get_singleton(struct dma_resv *obj, + struct dma_fence *extra) { struct dma_fence *result, **resv_fences, *fence, *chain, **fences; struct dma_fence_array *array; @@ -523,7 +525,7 @@ struct dma_fence *dma_resv_get_singleton(struct dma_resv *obj) if (err) return ERR_PTR(err); - if (num_resv_fences == 0) + if (num_resv_fences == 0 && !extra) return NULL; num_fences = 0; @@ -539,6 +541,16 @@ struct dma_fence *dma_resv_get_singleton(struct dma_resv *obj) } } + if (extra) { + dma_fence_deep_dive_for_each(fence, chain, j, extra) { + if (dma_fence_is_signaled(fence)) + continue; + + result = fence; + ++num_fences; + } + } + if (num_fences <= 1) { result = dma_fence_get(result); goto put_resv_fences; @@ -559,6 +571,13 @@ struct dma_fence *dma_resv_get_singleton(struct dma_resv *obj) } } + if (extra) { + dma_fence_deep_dive_for_each(fence, chain, j, extra) { + if (dma_fence_is_signaled(fence)) + fences[num_fences++] = dma_fence_get(fence); + } + } + if (num_fences <= 1) { result = num_fences ? fences[0] : NULL; kfree(fences); diff --git a/include/linux/dma-resv.h b/include/linux/dma-resv.h index d60982975a786..f970e03fc1a08 100644 --- a/include/linux/dma-resv.h +++ b/include/linux/dma-resv.h @@ -275,7 +275,8 @@ void dma_resv_add_excl_fence(struct dma_resv *obj, struct dma_fence *fence); 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); -struct dma_fence *dma_resv_get_singleton(struct dma_resv *obj); +struct dma_fence *dma_resv_get_singleton(struct dma_resv *obj, + struct dma_fence *extra); long dma_resv_wait_timeout(struct dma_resv *obj, bool wait_all, bool intr, unsigned long timeout); bool dma_resv_test_signaled(struct dma_resv *obj, bool test_all); -- 2.31.1