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| author | Robin Murphy <robin.murphy@arm.com> | 2018-12-10 14:00:28 +0000 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2018-12-11 14:31:17 +0100 |
| commit | 9f191555ba4ba8fc82e589670e46a7f79b72a157 (patch) | |
| tree | bcebdb4a6936baa0b76afc0fcb2af283a8f9c889 | |
| parent | 7c703e54cc71df5baa962e24a5663d88173bba5c (diff) | |
| download | linux-9f191555ba4ba8fc82e589670e46a7f79b72a157.tar.bz2 | |
dma-debug: Expose nr_total_entries in debugfs
Expose nr_total_entries in debugfs, so that {num,min}_free_entries
become even more meaningful to users interested in current/maximum
utilisation. This becomes even more relevant once nr_total_entries
may change at runtime beyond just the existing AMD GART debug code.
Suggested-by: John Garry <john.garry@huawei.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Tested-by: Qian Cai <cai@lca.pw>
Signed-off-by: Christoph Hellwig <hch@lst.de>
| -rw-r--r-- | Documentation/DMA-API.txt | 3 | ||||
| -rw-r--r-- | kernel/dma/debug.c | 7 |
2 files changed, 10 insertions, 0 deletions
diff --git a/Documentation/DMA-API.txt b/Documentation/DMA-API.txt index ac66ae2509a9..6bdb095393b0 100644 --- a/Documentation/DMA-API.txt +++ b/Documentation/DMA-API.txt @@ -723,6 +723,9 @@ dma-api/min_free_entries This read-only file can be read to get the dma-api/num_free_entries The current number of free dma_debug_entries in the allocator. +dma-api/nr_total_entries The total number of dma_debug_entries in the + allocator, both free and used. + dma-api/driver-filter You can write a name of a driver into this file to limit the debug output to requests from that particular driver. Write an empty string to diff --git a/kernel/dma/debug.c b/kernel/dma/debug.c index 231ca4628062..f6a141eb9438 100644 --- a/kernel/dma/debug.c +++ b/kernel/dma/debug.c @@ -142,6 +142,7 @@ static struct dentry *show_all_errors_dent __read_mostly; static struct dentry *show_num_errors_dent __read_mostly; static struct dentry *num_free_entries_dent __read_mostly; static struct dentry *min_free_entries_dent __read_mostly; +static struct dentry *nr_total_entries_dent __read_mostly; static struct dentry *filter_dent __read_mostly; /* per-driver filter related state */ @@ -926,6 +927,12 @@ static int dma_debug_fs_init(void) if (!min_free_entries_dent) goto out_err; + nr_total_entries_dent = debugfs_create_u32("nr_total_entries", 0444, + dma_debug_dent, + &nr_total_entries); + if (!nr_total_entries_dent) + goto out_err; + filter_dent = debugfs_create_file("driver_filter", 0644, dma_debug_dent, NULL, &filter_fops); if (!filter_dent) |