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Mercier" , =?utf-8?q?Christian_K=C3=B6nig?= , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Catalin Marinas , Will Deacon , Chun Ng 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=3268; i=treding@nvidia.com; h=from:subject:message-id; bh=HQOwe346eKLILGUmI6Jj24mMizqBZC+UN1JuTqxPA6o=; b=owEBbQKS/ZANAwAKAd0jrNd/PrOhAcsmYgBqfzRYmBB73yTjIp5WYf1lpDC/x5XoUQVQFUBsE No/1I1LYFCJAjMEAAEKAB0WIQSI6sMIAUnM98CNyJ/dI6zXfz6zoQUCan80WAAKCRDdI6zXfz6z oZWhD/4hADdFVVuUvAoZK8vnwfXJ/xRPQxPYCgpzlO8eC/xBPUIs2BUZCanYUlRY/Z96oGX7ivB u+VLQ/yymD2KtVUK1Cr5+MZNleFgmE6dONc2BdeToY3RfHjQq1apoi+paNZvQeZIhMH77FHFGbc kpgO9CLRwB+2rMDRspKHQoxXt3Iz3v3DvXJsZQvKTEwlrDGntDF+kLyrihrF6zLL/8aXexV1aX9 UAqqpn/zR04SbLtYQT08gdMQ2N9fuxXs5V+DEKW10Pq7UmbnEp0YzH9bRFAs0X99ULNLbggnRPh ikGbklpZPQkphOWasX007jnCYHoPGGfVannQFtE+lCH5KgVA7yRqjaYyF0/GEpZtIJBYBVBu6TN 78xWK9CyM6mluHtF4kr3sF0b3zNf/ElnTuqgCVRrq5WIqG4CF4mb3yuubfvDkPAUL//ToIfmVD1 +JnhzKzBJqKSyxC959QmwhelV/tls+oASyCVKUMSf1vwc+1PdNV+9ViaCDF5gXT+4SrVbXAXoPA fzKUZ2FmUvkjCxr+6BMxmnZLmRhFs5ge/h+xS4FDsZLGdgtT7bQJqLCL+oZFoM2A79WT+tP5cmt 52I38IluSVfOTmhe4upYRzOlQUw0hLB4XcPa2mI8dPQWD0/iwaaZGaTIoQg+c9qj3TiWs8Q9/p1 3YgAjy39e97CSgA== X-Developer-Key: i=treding@nvidia.com; a=openpgp; fpr=88EAC3080149CCF7C08DC89FDD23ACD77F3EB3A1 X-Rspamd-Queue-Id: BADBB40005 X-Rspamd-Server: rspam10 X-Rspam-User: X-Stat-Signature: csy7q417dtra5qikp1b84pyg3tk7fx9y X-HE-Tag: 1786721389-132055 X-HE-Meta: U2FsdGVkX181sAZA3QOER51eDOYr/JSK47Tzfk7MPCiAnQJ9ERpc/nl0CbrJ20BYAkfzvUV8M5wsaBsEzI/rZgJoQbhn1Z6gatwWtS+Qdd2caHOsDd8yGEPZpjAch8DNwiCIvvjNrKcJxgkDb9nsZjwUiylOqKKcl7JaDUeV4S5hpTrn6TOuimTf/vIFnHxh/PIzSckaUH2nNGrR/vNHcjeux9rKr4s8Z/YiMCvZ8dMZlIBghYhg+Iq5Ru9j06vxHcLZNlnA2BFt/PrNkom0tywlSDHDz7EgLnGlRnhPCRrRHj+sKLEiiwn1U2lH0qTmSknghF2P8n8IkiH/SVXnwAkmV9JLBa7SjYJ+7KelzFUF48I/RtTc27Yh9ZCjZSQT8ztCCgQ3xinb6y00Fo2vCy6Bvaynl7eU7RrOmn/yaE9OxdrJGKV275bDEM7NMDlbR/zzV5IXyRx3dydtYv+cG587jqdoszxCCTN2bmssL6vs4Lb3AEdG6O/B2WXexQ4hoR5DYt4tSXXraLDhIbAjDNuuG/6tRdr4YIBynwFdm1FkzG1tg3qKQibft5awehMhXbVn1qJ+L+3GhZozImNqAxYBkT42Mgeah2m/fKOqgPVi7IUDd05qDRLrPOwehVvwlwVXOZ+hFj14S7o62puZCsVTd096hl4wuU7EnSaxp35wzanrCwPP3++a+7KTppTG9X5rWDUyTkunlSaLh87IMenjhbUzTkfEFXuC9wzqhJTQgQoc2VTpiOkvQ0IxgIuSPM1BvJkVqYGdLcgjx6IWt2PIDk2WT9Mp13Wd/3HLTCvalYPahNR6n7X1lHH+7HtZE/ZLJGQdgcTmCEw6DDfaMolCj4d/xkEcJ5SBxJ7SaGAMD+wuxPDk46eKi7HwgFbSjElwklWgTBo6Ki1KlJrrGIf8V19c6oamgvHV8ZCN6EHvT+l8DelYxxQbWyfggGCkJpZI3ekCL0bVhSjwafr uZ/9J6VZ kv8nb1MOU+ij2iy7a/NFfnGzwyGZJdfY5CVhM9GhHgm+ihCumgmb36rrsvKvOcf/gIWdpvj3oxsJ5kmxm/Zu6RspN0Blu6BxzN3vKTMFg1A+5Hz88X+A7UnXrr3vSIk4B8Arr87fKwvH5SvwSAkE9nkRis0Z7EmbJ9MNRasSXQfMv6fJU0w/MXhYL9FE/ojbL7yzSAoKi4fCEQ8LkLkFOtAd/U6iR4PfYltijuAUI1zDPVBCL9sxiGQt4WEEq1b8j2PW8/1j1nu7F0gMREGj81ESlPIBhRNpkCc7ms+A2ynZoPpAHykR8PhlJ+ToroH9Fc3McSZhoA035sFo= 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. Reviewed-by: Maxime Ripard Signed-off-by: Thierry Reding --- Changes in v5: - fix failure handling during debugfs root directory creation - add more cleanup to the newly introduced dma_heap_exit() --- drivers/dma-buf/dma-heap.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++ include/linux/dma-heap.h | 2 ++ 2 files changed, 54 insertions(+) diff --git a/drivers/dma-buf/dma-heap.c b/drivers/dma-buf/dma-heap.c index 3937dd41bb0f..f279b8fdd3ce 100644 --- a/drivers/dma-buf/dma-heap.c +++ b/drivers/dma-buf/dma-heap.c @@ -7,6 +7,7 @@ */ #include +#include #include #include #include @@ -225,6 +226,40 @@ 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) +{ + dma_heap_debugfs_dir = debugfs_create_dir("dma_heap", NULL); +} + +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 @@ -299,6 +334,13 @@ 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; @@ -335,6 +377,16 @@ 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(); + class_destroy(dma_heap_class); + unregister_chrdev_region(dma_heap_devt, NUM_HEAP_MINORS); +} +__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); }; /** -- 2.55.0