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authorCorentin Labbe <clabbe@baylibre.com>2019-01-18 13:44:18 (GMT)
committerChristoph Hellwig <hch@lst.de>2019-02-01 09:06:44 (GMT)
commit0a3b192c26da198fce38e1ee242a34f558670246 (patch)
tree50c7205f8335fed7863f9446db981936cd350a6e /Documentation/DMA-API.txt
parent8e4d81b98b7859b120dd142c8634f625db118b30 (diff)
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dma-debug: add dumping facility via debugfs
While debugging a DMA mapping leak, I needed to access debug_dma_dump_mappings() but easily from user space. This patch adds a /sys/kernel/debug/dma-api/dump file which contain all current DMA mapping. Signed-off-by: Corentin Labbe <clabbe@baylibre.com> Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'Documentation/DMA-API.txt')
-rw-r--r--Documentation/DMA-API.txt3
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/DMA-API.txt b/Documentation/DMA-API.txt
index e133ccd..78114ee 100644
--- a/Documentation/DMA-API.txt
+++ b/Documentation/DMA-API.txt
@@ -696,6 +696,9 @@ dma-api/disabled This read-only file contains the character 'Y'
happen when it runs out of memory or if it was
disabled at boot time
+dma-api/dump This read-only file contains current DMA
+ mappings.
+
dma-api/error_count This file is read-only and shows the total
numbers of errors found.