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[2003:e4:1f1c:4d00:f22f:74ff:fe1f:3a53]) by smtp.gmail.com with UTF8SMTPSA id ffacd0b85a97d-3d95df59e50sm4845738f8f.23.2025.09.02.08.46.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 02 Sep 2025 08:46:53 -0700 (PDT) From: Thierry Reding To: Thierry Reding , David Airlie , Simona Vetter , Sumit Semwal Cc: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Benjamin Gaignard , Brian Starkey , John Stultz , "T.J. Mercier" , Andrew Morton , David Hildenbrand , Mike Rapoport , 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 4/9] dma-buf: heaps: Add debugfs support Date: Tue, 2 Sep 2025 17:46:24 +0200 Message-ID: <20250902154630.4032984-5-thierry.reding@gmail.com> X-Mailer: git-send-email 2.50.0 In-Reply-To: <20250902154630.4032984-1-thierry.reding@gmail.com> References: <20250902154630.4032984-1-thierry.reding@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: 87fyzkd97gzgozjbf1x83f9e9cmm8x9j X-Rspam-User: X-Rspamd-Queue-Id: AB933A0016 X-Rspamd-Server: rspam05 X-HE-Tag: 1756828017-889211 X-HE-Meta: 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 8RRUCNMe 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 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 cdddf0e24dce..f062f88365a5 100644 --- a/drivers/dma-buf/dma-heap.c +++ b/drivers/dma-buf/dma-heap.c @@ -7,6 +7,7 @@ */ #include +#include #include #include #include @@ -217,6 +218,46 @@ const char *dma_heap_get_name(struct dma_heap *heap) } EXPORT_SYMBOL(dma_heap_get_name); +#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 @@ -291,6 +332,13 @@ 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; @@ -327,6 +375,14 @@ 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 27d15f60950a..065f537177af 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); }; /** -- 2.50.0