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Mercier" , =?utf-8?q?Christian_K=C3=B6nig?= , linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, linux-kernel@vger.kernel.org Cc: opensource.kernel@vivo.com, Huan Yang Subject: [PATCH v2 5/5] dma-buf: heaps: configurable async read gather limit Date: Tue, 30 Jul 2024 15:57:49 +0800 Message-ID: <20240730075755.10941-6-link@vivo.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240730075755.10941-1-link@vivo.com> References: <20240730075755.10941-1-link@vivo.com> X-ClientProxiedBy: SI1PR02CA0008.apcprd02.prod.outlook.com (2603:1096:4:1f7::14) To PUZPR06MB5676.apcprd06.prod.outlook.com (2603:1096:301:f8::10) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PUZPR06MB5676:EE_|SI2PR06MB5386:EE_ X-MS-Office365-Filtering-Correlation-Id: 99971946-0b0a-4192-4e2b-08dcb06d6652 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; ARA:13230040|7416014|376014|1800799024|52116014|366016|38350700014|921020; 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However, system administrators should be given a considerable degree of freedom to adjust based on the system's situation. This patch exports the limit to the corresponding area of the dma-heap. Signed-off-by: Huan Yang --- drivers/dma-buf/dma-heap.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/dma-buf/dma-heap.c b/drivers/dma-buf/dma-heap.c index df1b2518f126..2b69cf3ca570 100644 --- a/drivers/dma-buf/dma-heap.c +++ b/drivers/dma-buf/dma-heap.c @@ -417,6 +417,11 @@ size_t dma_heap_file_size(struct dma_heap_file *heap_file) return heap_file->fsize; } +#define DEFAULT_DMA_BUF_HEAPS_GATHER_LIMIT (128 << 20) +static int dma_buf_heaps_gather_limit = DEFAULT_DMA_BUF_HEAPS_GATHER_LIMIT; +module_param_named(gather_limit, dma_buf_heaps_gather_limit, int, 0644); +MODULE_PARM_DESC(gather_limit, "Asynchronous file reading, with a maximum limit on the amount to be gathered"); + static int init_dma_heap_file(struct dma_heap_file *heap_file, int file_fd) { struct file *file; @@ -442,9 +447,8 @@ static int init_dma_heap_file(struct dma_heap_file *heap_file, int file_fd) } heap_file->file = file; -#define DEFAULT_DMA_BUF_HEAPS_GATHER_LIMIT (128 << 20) heap_file->glimit = min_t(size_t, PAGE_ALIGN(fsz), - DEFAULT_DMA_BUF_HEAPS_GATHER_LIMIT); + PAGE_ALIGN(dma_buf_heaps_gather_limit)); heap_file->fsize = fsz; heap_file->direct = file->f_flags & O_DIRECT;