On 06-03-20, 16:28, Peter Ujfalusi wrote: > Hi, > > Changes sicne v4: > - Move the dmaengine_debugfs_init() from late_initcall to be called from > dma_bus_init to avoid races due to probe orders of drivers. > - Separate patch to create DMA driver directories for debugfs > > Changes since v3: > - Create a directory for dmaengine and name the initial file as summary > - Function to get the debugfs root for DMA drivers if they want to place files > - Custom dbg_summary_show implementation for k3-udma > > Changes since v2: > - Use dma_chan_name() for printing the channel's name > > Changes since v1: > - Use much more simplified fops for the debugfs file (via DEFINE_SHOW_ATTRIBUTE) > - do not allow modification to dma_device_list while the debugfs file is read > - rename the slave_name to dbg_client_name (it is only for debugging) > - print information about dma_router if it is used by the channel > - Formating of the output slightly changed > > The basic debugfs file (/sys/kernel/debug/dmaengine/summary) can be used to > query basic information about the DMAengine usage (am654-evm): > > # cat /sys/kernel/debug/dmaengine/summary > dma0 (285c0000.dma-controller): number of channels: 96 > > dma1 (31150000.dma-controller): number of channels: 267 > dma1chan0 | 2b00000.mcasp:tx > dma1chan1 | 2b00000.mcasp:rx > dma1chan2 | in-use > dma1chan3 | in-use > dma1chan4 | in-use > dma1chan5 | in-use > > Drivers can implement custom dbg_summary_show to add extended information via > the summary file, like with the second patch for k3-udma (j721e-evm): > > # cat /sys/kernel/debug/dmaengine/summary > dma0 (285c0000.dma-controller): number of channels: 24 > > dma1 (31150000.dma-controller): number of channels: 84 > dma1chan0 | 2b00000.mcasp:tx (MEM_TO_DEV, tchan16 [0x1010 -> 0xc400], PDMA[ ACC32 BURST ], TR mode) > dma1chan1 | 2b00000.mcasp:rx (DEV_TO_MEM, rchan16 [0x4400 -> 0x9010], PDMA[ ACC32 BURST ], TR mode) > dma1chan2 | 2ba0000.mcasp:tx (MEM_TO_DEV, tchan17 [0x1011 -> 0xc507], PDMA[ ACC32 BURST ], TR mode) > dma1chan3 | 2ba0000.mcasp:rx (DEV_TO_MEM, rchan17 [0x4507 -> 0x9011], PDMA[ ACC32 BURST ], TR mode) > dma1chan4 | in-use (MEM_TO_MEM, chan0 pair [0x1000 -> 0x9000], PSI-L Native, TR mode) > dma1chan5 | in-use (MEM_TO_MEM, chan1 pair [0x1001 -> 0x9001], PSI-L Native, TR mode) > dma1chan6 | in-use (MEM_TO_MEM, chan4 pair [0x1004 -> 0x9004], PSI-L Native, TR mode) > dma1chan7 | in-use (MEM_TO_MEM, chan5 pair [0x1005 -> 0x9005], PSI-L Native, TR mode) > > With the last patch the debugfs looks like this: > # ls -al /sys/kernel/debug/dmaengine/ > total 0 > drwxr-xr-x 4 root root 0 Jan 1 02:00 . > drwx------ 29 root root 0 Jan 1 02:00 .. > drwxr-xr-x 2 root root 0 Jan 1 02:00 285c0000.dma-controller > drwxr-xr-x 2 root root 0 Jan 1 02:00 31150000.dma-controller > -r--r--r-- 1 root root 0 Jan 1 02:00 summary Applied, thanks -- ~Vinod
