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J . Mercier" , John Stultz , Yong Wu , =?utf-8?q?N=C3=ADcolas_F_=2E_R_=2E_A_=2E_Pr?= =?utf-8?q?ado?= , Nicolas Dufresne , Hans Verkuil , AngeloGioacchino Del Regno , Benjamin Gaignard , Nathan Hebert CC: Chen-Yu Tsai , Hsin-Yi Wang , Fritz Koenig , Daniel Vetter , "Steve Cho" , Yunfei Dong , , , , , , Subject: [PATCH v2,07/21] dma-heap: Provide accessors so that in-kernel drivers can allocate dmabufs from specific heaps Date: Mon, 6 Nov 2023 20:04:09 +0800 Message-ID: <20231106120423.23364-8-yunfei.dong@mediatek.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20231106120423.23364-1-yunfei.dong@mediatek.com> References: <20231106120423.23364-1-yunfei.dong@mediatek.com> MIME-Version: 1.0 X-TM-AS-Product-Ver: SMEX-14.0.0.3152-9.1.1006-23728.005 X-TM-AS-Result: No-10--7.817000-8.000000 X-TMASE-MatchedRID: 173cC0PKvpvtt0HEL3BUV4lD2T5imTkJ2qBSQHAh8pg0QmmUihPzrFJS 0b8z/9TB8AyWk2NFMNbijpjet3oGSJCoy9iDotiwNNHZMWDTEbe4UO5+xwKkcStjI02a+7m1J7o vlkPXpS3VaZR68ynk9lCRaYaDm6fHBCaQyxlaPkG3D7EeeyZCMzGZtPrBBPZrEvoxTu3fj1tEe5 BdjBKTALjfysYMcGyRGce8edCRlYkmcsJib2IjaaOuVibdZNTv7yWPaQc4INQOkJQR4QWbsG+3c txX3zZNo2jEjZ+uot1HVle6mAl0da+/EguYor8cFEUknJ/kEl7dB/CxWTRRu4as+d5/8j56CqkU I6VLHbp1IjXaXB8Mtq8az9DCJcKSIUrN7T23diALxcqOxVsmNQ== X-TM-AS-User-Approved-Sender: No X-TM-AS-User-Blocked-Sender: No X-TMASE-Result: 10--7.817000-8.000000 X-TMASE-Version: SMEX-14.0.0.3152-9.1.1006-23728.005 X-TM-SNTS-SMTP: 6C58B4693251C7073F5DB3015C87B19E715D3ED85626D74341004547E9F02B962000:8 X-MTK: N Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org From: John Stultz This allows drivers who don't want to create their own DMA-BUF exporter to be able to allocate DMA-BUFs directly from existing DMA-BUF Heaps. There is some concern that the premise of DMA-BUF heaps is that userland knows better about what type of heap memory is needed for a pipeline, so it would likely be best for drivers to import and fill DMA-BUFs allocated by userland instead of allocating one themselves, but this is still up for debate. Signed-off-by: John Stultz Signed-off-by: T.J. Mercier Signed-off-by: Yong Wu [Yong: Fix the checkpatch alignment warning] Signed-off-by: Yunfei Dong --- drivers/dma-buf/dma-heap.c | 83 ++++++++++++++++++++++++++++++-------- include/linux/dma-heap.h | 6 +++ 2 files changed, 73 insertions(+), 16 deletions(-) diff --git a/drivers/dma-buf/dma-heap.c b/drivers/dma-buf/dma-heap.c index 97025ee8500f..6efe833a4b10 100644 --- a/drivers/dma-buf/dma-heap.c +++ b/drivers/dma-buf/dma-heap.c @@ -51,12 +51,24 @@ static dev_t dma_heap_devt; static struct class *dma_heap_class; static DEFINE_XARRAY_ALLOC(dma_heap_minors); -static int dma_heap_buffer_alloc(struct dma_heap *heap, size_t len, - unsigned int fd_flags, - unsigned int heap_flags) +/** + * dma_heap_buffer_alloc - Allocate dma-buf from a dma_heap + * @heap: DMA-Heap to allocate from + * @len: size to allocate in bytes + * @fd_flags: flags to set on returned dma-buf fd + * @heap_flags: flags to pass to the dma heap + * + * This is for internal dma-buf allocations only. Free returned buffers with dma_buf_put(). + */ +struct dma_buf *dma_heap_buffer_alloc(struct dma_heap *heap, size_t len, + unsigned int fd_flags, + unsigned int heap_flags) { - struct dma_buf *dmabuf; - int fd; + if (fd_flags & ~DMA_HEAP_VALID_FD_FLAGS) + return ERR_PTR(-EINVAL); + + if (heap_flags & ~DMA_HEAP_VALID_HEAP_FLAGS) + return ERR_PTR(-EINVAL); /* * Allocations from all heaps have to begin @@ -64,9 +76,20 @@ static int dma_heap_buffer_alloc(struct dma_heap *heap, size_t len, */ len = PAGE_ALIGN(len); if (!len) - return -EINVAL; + return ERR_PTR(-EINVAL); + + return heap->ops->allocate(heap, len, fd_flags, heap_flags); +} +EXPORT_SYMBOL_GPL(dma_heap_buffer_alloc); - dmabuf = heap->ops->allocate(heap, len, fd_flags, heap_flags); +static int dma_heap_bufferfd_alloc(struct dma_heap *heap, size_t len, + unsigned int fd_flags, + unsigned int heap_flags) +{ + struct dma_buf *dmabuf; + int fd; + + dmabuf = dma_heap_buffer_alloc(heap, len, fd_flags, heap_flags); if (IS_ERR(dmabuf)) return PTR_ERR(dmabuf); @@ -104,15 +127,9 @@ static long dma_heap_ioctl_allocate(struct file *file, void *data) if (heap_allocation->fd) return -EINVAL; - if (heap_allocation->fd_flags & ~DMA_HEAP_VALID_FD_FLAGS) - return -EINVAL; - - if (heap_allocation->heap_flags & ~DMA_HEAP_VALID_HEAP_FLAGS) - return -EINVAL; - - fd = dma_heap_buffer_alloc(heap, heap_allocation->len, - heap_allocation->fd_flags, - heap_allocation->heap_flags); + fd = dma_heap_bufferfd_alloc(heap, heap_allocation->len, + heap_allocation->fd_flags, + heap_allocation->heap_flags); if (fd < 0) return fd; @@ -205,6 +222,7 @@ void *dma_heap_get_drvdata(struct dma_heap *heap) { return heap->priv; } +EXPORT_SYMBOL_GPL(dma_heap_get_drvdata); /** * dma_heap_get_name - get heap name @@ -217,6 +235,7 @@ const char *dma_heap_get_name(struct dma_heap *heap) { return heap->name; } +EXPORT_SYMBOL_GPL(dma_heap_get_name); /** * dma_heap_add - adds a heap to dmabuf heaps @@ -307,6 +326,37 @@ struct dma_heap *dma_heap_add(const struct dma_heap_export_info *exp_info) kfree(heap); return err_ret; } +EXPORT_SYMBOL_GPL(dma_heap_add); + +/** + * dma_heap_find - get the heap registered with the specified name + * @name: Name of the DMA-Heap to find + * + * Returns: + * The DMA-Heap with the provided name. + * + * NOTE: DMA-Heaps returned from this function MUST be released using + * dma_heap_put() when the user is done to enable the heap to be unloaded. + */ +struct dma_heap *dma_heap_find(const char *name) +{ + struct dma_heap *h; + + mutex_lock(&heap_list_lock); + list_for_each_entry(h, &heap_list, list) { + if (!kref_get_unless_zero(&h->refcount)) + continue; + + if (!strcmp(h->name, name)) { + mutex_unlock(&heap_list_lock); + return h; + } + dma_heap_put(h); + } + mutex_unlock(&heap_list_lock); + return NULL; +} +EXPORT_SYMBOL_GPL(dma_heap_find); static void dma_heap_release(struct kref *ref) { @@ -332,6 +382,7 @@ void dma_heap_put(struct dma_heap *heap) { kref_put(&heap->refcount, dma_heap_release); } +EXPORT_SYMBOL_GPL(dma_heap_put); static char *dma_heap_devnode(const struct device *dev, umode_t *mode) { diff --git a/include/linux/dma-heap.h b/include/linux/dma-heap.h index d57593f8a1bc..3cbf9bff2346 100644 --- a/include/linux/dma-heap.h +++ b/include/linux/dma-heap.h @@ -46,6 +46,12 @@ const char *dma_heap_get_name(struct dma_heap *heap); struct dma_heap *dma_heap_add(const struct dma_heap_export_info *exp_info); +struct dma_heap *dma_heap_find(const char *name); + void dma_heap_put(struct dma_heap *heap); +struct dma_buf *dma_heap_buffer_alloc(struct dma_heap *heap, size_t len, + unsigned int fd_flags, + unsigned int heap_flags); + #endif /* _DMA_HEAPS_H */