dma-debug: add Kconfig entry

Impact: add a Kconfig entry for DMA-API debugging

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

2 files changed, 13 insertions, 0 deletions

diff --git a/arch/Kconfig b/arch/Kconfig
index 550dab22daa1..830c16a2b801 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -106,3 +106,5 @@ config HAVE_CLK
           The <linux/clk.h> calls support software clock gating and
           thus are a key power management tool on many systems.
 
+config HAVE_DMA_API_DEBUG
+        bool
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 1bcf9cd4baa0..d9cbada7e2f8 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -902,6 +902,17 @@ config DYNAMIC_PRINTK_DEBUG
           debugging for all modules. This mode can be turned off via the above
           disable command.
 
+config DMA_API_DEBUG
+        bool "Enable debugging of DMA-API usage"
+        depends on HAVE_DMA_API_DEBUG
+        help
+          Enable this option to debug the use of the DMA API by device drivers.
+          With this option you will be able to detect common bugs in device
+          drivers like double-freeing of DMA mappings or freeing mappings that
+          were never allocated.
+          This option causes a performance degredation.  Use only if you want
+          to debug device drivers. If unsure, say N.
+
 source "samples/Kconfig"
 
 source "lib/Kconfig.kgdb"