From 26cf132de6f79c06025706ddc61e045d591d404d Mon Sep 17 00:00:00 2001 From: Peter Ujfalusi Date: Fri, 6 Mar 2020 16:28:39 +0200 Subject: dmaengine: Create debug directories for DMA devices Create a placeholder directory for each registered DMA device. DMA drivers can use the dmaengine_get_debugfs_root() call to get their debugfs root and can populate with custom files to aim debugging. Signed-off-by: Peter Ujfalusi Link: https://lore.kernel.org/r/20200306142839.17910-4-peter.ujfalusi@ti.com Signed-off-by: Vinod Koul --- drivers/dma/dmaengine.c | 28 +++++++++++++++++++++++++++- 1 file changed, 27 insertions(+), 1 deletion(-) (limited to 'drivers/dma/dmaengine.c') diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c index 509abc8e8378..5a442752e07d 100644 --- a/drivers/dma/dmaengine.c +++ b/drivers/dma/dmaengine.c @@ -62,6 +62,22 @@ static long dmaengine_ref_count; #ifdef CONFIG_DEBUG_FS #include +static struct dentry *rootdir; + +static void dmaengine_debug_register(struct dma_device *dma_dev) +{ + dma_dev->dbg_dev_root = debugfs_create_dir(dev_name(dma_dev->dev), + rootdir); + if (IS_ERR(dma_dev->dbg_dev_root)) + dma_dev->dbg_dev_root = NULL; +} + +static void dmaengine_debug_unregister(struct dma_device *dma_dev) +{ + debugfs_remove_recursive(dma_dev->dbg_dev_root); + dma_dev->dbg_dev_root = NULL; +} + static void dmaengine_dbg_summary_show(struct seq_file *s, struct dma_device *dma_dev) { @@ -107,7 +123,7 @@ DEFINE_SHOW_ATTRIBUTE(dmaengine_summary); static void __init dmaengine_debugfs_init(void) { - struct dentry *rootdir = debugfs_create_dir("dmaengine", NULL); + rootdir = debugfs_create_dir("dmaengine", NULL); /* /sys/kernel/debug/dmaengine/summary */ debugfs_create_file("summary", 0444, rootdir, NULL, @@ -115,6 +131,12 @@ static void __init dmaengine_debugfs_init(void) } #else static inline void dmaengine_debugfs_init(void) { } +static inline int dmaengine_debug_register(struct dma_device *dma_dev) +{ + return 0; +} + +static inline void dmaengine_debug_unregister(struct dma_device *dma_dev) { } #endif /* DEBUG_FS */ /* --- sysfs implementation --- */ @@ -1265,6 +1287,8 @@ int dma_async_device_register(struct dma_device *device) dma_channel_rebalance(); mutex_unlock(&dma_list_mutex); + dmaengine_debug_register(device); + return 0; err_out: @@ -1298,6 +1322,8 @@ void dma_async_device_unregister(struct dma_device *device) { struct dma_chan *chan, *n; + dmaengine_debug_unregister(device); + list_for_each_entry_safe(chan, n, &device->channels, device_node) __dma_async_device_channel_unregister(device, chan); -- cgit