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Mercier" , =?utf-8?q?Christian_K=C3=B6nig?= , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Catalin Marinas , Will Deacon Cc: Thierry Reding , devicetree@vger.kernel.org, linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-media@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-s390@vger.kernel.org, linux-mm@kvack.org, iommu@lists.linux.dev, linaro-mm-sig@lists.linaro.org, linux-trace-kernel@vger.kernel.org, Thierry Reding X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=3055; i=treding@nvidia.com; h=from:subject:message-id; bh=QlmXWpcpy6Y0NBVntHIBMLvS9FZD2uUVsJ4SeVpIf+Y=; b=owEBbQKS/ZANAwAKAd0jrNd/PrOhAcsmYgBqRTuGp+zb11y66T9UFttG10WqjASBRaNLa3apL UC8kjL7aY6JAjMEAAEKAB0WIQSI6sMIAUnM98CNyJ/dI6zXfz6zoQUCakU7hgAKCRDdI6zXfz6z oZenEACSZnZGdi9oDEskVtAmQ7Iq+Z1zDTxEt4m8vq8x+Tdli9Lp8CM6EoNlpa2chjq78Z1BkY8 CI6atjAQw1htYZJT5hVMoDluRn3EXAdH/T6z3JGodHS+bX+6rd7FBEkDKZLkTo81tv7tr2T+ATw eKO4g+DAwcexRYKeRnrr8cRAnlhEHSeUCb+byIYHYMqtqDnBSZR3kR/4nHrzorvikJF2ifD/sKQ gcVLkfBN2Zb4pr3FxtEdKzlTNlOmKITsRZ+sZEBtO7opp3NwJFImhGPzBAjWs6h21kPinPhFab4 ZDG6iwuDXGegKGLwJ8rE2eShFeikOV5yXp4ZTPfi3CUD19I39n48nh9j3MgbM7JdmPZkj9aZrHw ncVZ2/xWFWw4zxwr6fkrHmXOEDg9M+68wn7+O72Pz/YndLVyOBq6DvsDmTHvSIz02AMeqlIQFB1 A43oxA9Wvk7q7PHXWCUzu2UEOjrJp4MVrsm4z7YI0RgTy23l4dxRKDGO1C6LZBIGkP+Mvgby6NK FVZBFENxayPwfxHZzHXTJS8vIt3pZHrzwteSy+jGS0s6uO2NJoa3lBHLfbq0iE9xLpoUSu7wW/B G3r78fDqHtQft7uMHo+16WCcD1trjs8KbP+fQBJCuS5/GEKvjnxIgj7YhRHnHN3CTFKk/pn7rna LanK40WLvws7xzw== X-Developer-Key: i=treding@nvidia.com; a=openpgp; fpr=88EAC3080149CCF7C08DC89FDD23ACD77F3EB3A1 X-Rspam-User: X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 523481C0004 X-Stat-Signature: ukad7bmgot7usxxqm4b9hw5hf9xk4q6t X-HE-Tag: 1782922142-756527 X-HE-Meta: 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 i2fS5QR5 Hnh/nJfnWyD+i9zfJKZgpStN5ugS78HEw2GJIZNkiXUrF1fRYeokJku+jwummOcrJ3aZDMLVpne4TyD5pPXhC673dG8KjwUp4RsN58SGr2wlNaLVTDjCpeR+QZ/U5oO/4eOWLPqiCLwMSPvbh5XiEMSjn+Woaf61E5+czp3YMo4rEan+7AaSYyqs83i7glR0yqXjNlQ+jowvtK2RDTOoQXDCuWkx4thQQnWIUzpO3yWA3wYTuZMAKBKODU+f8DbkLXFjR3+6LRksW3y2c5rCo94WbQRJO/fNUcGTHhbXQ3MQ+uSe18faIJ6bXM1UFxCpDUuNkhuob/6SYzFQ7btRcHU14fti0I6BkYd1V 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 a76bf3f8b071..1ceb6ee8c05a 100644 --- a/drivers/dma-buf/dma-heap.c +++ b/drivers/dma-buf/dma-heap.c @@ -7,6 +7,7 @@ */ #include +#include #include #include #include @@ -224,6 +225,46 @@ 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 @@ -298,6 +339,13 @@ 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; @@ -334,6 +382,14 @@ 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); }; /** -- 2.54.0