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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>
This commit is contained in:
Robin Murphy 2018-12-10 14:00:28 +00:00 committed by Christoph Hellwig
parent 7c703e54cc
commit 9f191555ba
2 changed files with 10 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
Documentation/DMA-API.txt
View File

@ -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 dma-api/num_free_entries The current number of free dma_debug_entries
in the allocator. 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 dma-api/driver-filter You can write a name of a driver into this file
to limit the debug output to requests from that to limit the debug output to requests from that
particular driver. Write an empty string to particular driver. Write an empty string to

7
kernel/dma/debug.c
View File

@ -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 *show_num_errors_dent __read_mostly;
static struct dentry *num_free_entries_dent __read_mostly; static struct dentry *num_free_entries_dent __read_mostly;
static struct dentry *min_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; static struct dentry *filter_dent __read_mostly;
/* per-driver filter related state */ /* per-driver filter related state */
@ -926,6 +927,12 @@ static int dma_debug_fs_init(void)
if (!min_free_entries_dent) if (!min_free_entries_dent)
goto out_err; 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, filter_dent = debugfs_create_file("driver_filter", 0644,
dma_debug_dent, NULL, &filter_fops); dma_debug_dent, NULL, &filter_fops);
if (!filter_dent) if (!filter_dent)