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authorJoerg Roedel <joerg.roedel@amd.com>2009-01-09 15:01:56 +0300
committerJoerg Roedel <joerg.roedel@amd.com>2009-03-05 22:35:16 +0300
commit59d3daafa17265f01149df8eab3fb69b9b42cb2e (patch)
treeb4c0f3525f976dd5ec37730dee76ed227dcd25d5 /lib
parent6bf078715c1998d4d10716251cc10ce45908594c (diff)
downloadlinux-59d3daafa17265f01149df8eab3fb69b9b42cb2e.tar.xz
dma-debug: add kernel command line parameters
Impact: add dma_debug= and dma_debug_entries= kernel parameters Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Diffstat (limited to 'lib')
-rw-r--r--lib/dma-debug.c38
1 files changed, 38 insertions, 0 deletions
diff --git a/lib/dma-debug.c b/lib/dma-debug.c
index 5b50bb31f7c6..2ede46308024 100644
--- a/lib/dma-debug.c
+++ b/lib/dma-debug.c
@@ -64,6 +64,9 @@ static bool global_disable __read_mostly;
static u32 num_free_entries;
static u32 min_free_entries;
+/* number of preallocated entries requested by kernel cmdline */
+static u32 req_entries;
+
/*
* Hash related functions
*
@@ -253,6 +256,9 @@ void dma_debug_init(u32 num_entries)
dma_entry_hash[i].lock = SPIN_LOCK_UNLOCKED;
}
+ if (req_entries)
+ num_entries = req_entries;
+
if (prealloc_memory(num_entries) != 0) {
printk(KERN_ERR "DMA-API: debugging out of memory error "
"- disabled\n");
@@ -264,3 +270,35 @@ void dma_debug_init(u32 num_entries)
printk(KERN_INFO "DMA-API: debugging enabled by kernel config\n");
}
+static __init int dma_debug_cmdline(char *str)
+{
+ if (!str)
+ return -EINVAL;
+
+ if (strncmp(str, "off", 3) == 0) {
+ printk(KERN_INFO "DMA-API: debugging disabled on kernel "
+ "command line\n");
+ global_disable = true;
+ }
+
+ return 0;
+}
+
+static __init int dma_debug_entries_cmdline(char *str)
+{
+ int res;
+
+ if (!str)
+ return -EINVAL;
+
+ res = get_option(&str, &req_entries);
+
+ if (!res)
+ req_entries = 0;
+
+ return 0;
+}
+
+__setup("dma_debug=", dma_debug_cmdline);
+__setup("dma_debug_entries=", dma_debug_entries_cmdline);
+