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J . Mercier" , Andrew Morton , David Hildenbrand , Mike Rapoport , Sumit Garg , dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-tegra@vger.kernel.org, linaro-mm-sig@lists.linaro.org, linux-mm@kvack.org Subject: [PATCH v2 05/10] dma-buf: heaps: Add debugfs support Date: Thu, 22 Jan 2026 17:10:04 +0100 Message-ID: <20260122161009.3865888-6-thierry.reding@kernel.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260122161009.3865888-1-thierry.reding@kernel.org> References: <20260122161009.3865888-1-thierry.reding@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Queue-Id: 32C17100005 X-Rspamd-Server: rspam07 X-Stat-Signature: 4fub7kijeun69edhj9j3nhwdkw6hib9q X-HE-Tag: 1769098231-968889 X-HE-Meta: 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 mhisZIAu lsaG+p5UFgUuPgFjXrnTJZNZSepnmAeKTCriAHCbrcD8o0Vujo1umiwpYAebTTUlyZT/vmd8x8B1sWMEuyxP4EtZOLJ9SPjD+bpRRYBWXFq6U7bVtICsIpMRGDpgnLmyjdyOI2LeSFzSN99VtEmmpOfYhxP2YNs0LX8iooZjQT/bX8j9FF6OKAjcYY7iMkLZf9P6my1gJl4RWmAu/Gv7UGuK0ByPZz/hOMnVF2ltml7Jt/5A0YljrItETiZRmfF3pso59ju4/BXS2ks0aO+U05qAt1hLDXiUI+joLumJYr7ehtlyp5xRqj/skfPmIEt9R7Jh4DDtt7ZFM/wMxifhw0pc/CqqMBBzxpDztHNC5VoHuOD/TXhouSDHTRA== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Thierry Reding Add a callback to struct dma_heap_ops that heap providers can implement to show information about the state of the heap in debugfs. A top-level directory named "dma_heap" is created in debugfs and individual files will be named after the heaps. Signed-off-by: Thierry Reding --- drivers/dma-buf/dma-heap.c | 56 ++++++++++++++++++++++++++++++++++++++ include/linux/dma-heap.h | 2 ++ 2 files changed, 58 insertions(+) diff --git a/drivers/dma-buf/dma-heap.c b/drivers/dma-buf/dma-heap.c index d230ddeb24e0..9784fa74ce53 100644 --- a/drivers/dma-buf/dma-heap.c +++ b/drivers/dma-buf/dma-heap.c @@ -7,6 +7,7 @@ */ #include +#include #include #include #include @@ -223,6 +224,46 @@ const char *dma_heap_get_name(struct dma_heap *heap) } EXPORT_SYMBOL_NS_GPL(dma_heap_get_name, "DMA_BUF_HEAP"); +#ifdef CONFIG_DEBUG_FS +static int dma_heap_debug_show(struct seq_file *s, void *unused) +{ + struct dma_heap *heap = s->private; + int err = 0; + + if (heap->ops && heap->ops->show) + err = heap->ops->show(s, heap); + + return err; +} +DEFINE_SHOW_ATTRIBUTE(dma_heap_debug); + +static struct dentry *dma_heap_debugfs_dir; + +static void dma_heap_init_debugfs(void) +{ + struct dentry *dir; + + dir = debugfs_create_dir("dma_heap", NULL); + if (IS_ERR(dir)) + return; + + dma_heap_debugfs_dir = dir; +} + +static void dma_heap_exit_debugfs(void) +{ + debugfs_remove_recursive(dma_heap_debugfs_dir); +} +#else +static void dma_heap_init_debugfs(void) +{ +} + +static void dma_heap_exit_debugfs(void) +{ +} +#endif + /** * dma_heap_add - adds a heap to dmabuf heaps * @exp_info: information needed to register this heap @@ -297,6 +338,13 @@ struct dma_heap *dma_heap_add(const struct dma_heap_export_info *exp_info) /* Add heap to the list */ list_add(&heap->list, &heap_list); + +#ifdef CONFIG_DEBUG_FS + if (heap->ops && heap->ops->show) + debugfs_create_file(heap->name, 0444, dma_heap_debugfs_dir, + heap, &dma_heap_debug_fops); +#endif + mutex_unlock(&heap_list_lock); return heap; @@ -333,6 +381,14 @@ static int dma_heap_init(void) } dma_heap_class->devnode = dma_heap_devnode; + dma_heap_init_debugfs(); + return 0; } subsys_initcall(dma_heap_init); + +static void __exit dma_heap_exit(void) +{ + dma_heap_exit_debugfs(); +} +__exitcall(dma_heap_exit); diff --git a/include/linux/dma-heap.h b/include/linux/dma-heap.h index 648328a64b27..1c9bed1f4dde 100644 --- a/include/linux/dma-heap.h +++ b/include/linux/dma-heap.h @@ -12,6 +12,7 @@ #include struct dma_heap; +struct seq_file; /** * struct dma_heap_ops - ops to operate on a given heap @@ -24,6 +25,7 @@ struct dma_heap_ops { unsigned long len, u32 fd_flags, u64 heap_flags); + int (*show)(struct seq_file *s, struct dma_heap *heap); }; /** -- 2.52.0