Commit-ID: fab852aaf761a00cfe16330429b7cac15cceaeb9
Gitweb: http://git.kernel.org/tip/fab852aaf761a00cfe16330429b7cac15cceaeb9
Author: Pekka Paalanen <pq@xxxxxx>
AuthorDate: Sun, 1 Mar 2009 16:09:14 +0200
Commit: Ingo Molnar <mingo@xxxxxxx>
CommitDate: Mon, 2 Mar 2009 10:20:34 +0100
x86: count errors in testmmiotrace.ko
Check the read values against the written values in the MMIO read/write
test. This test shows if the given MMIO test area really works as
memory, which is a prerequisite for a successful mmiotrace test.
Signed-off-by: Pekka Paalanen <pq@xxxxxx>
Cc: Stuart Bennett <stuart@xxxxxxxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
arch/x86/mm/testmmiotrace.c | 35 +++++++++++++++++++++++++++++------
1 files changed, 29 insertions(+), 6 deletions(-)
diff --git a/arch/x86/mm/testmmiotrace.c b/arch/x86/mm/testmmiotrace.c
index ab50a8d..4b29f3b 100644
--- a/arch/x86/mm/testmmiotrace.c
+++ b/arch/x86/mm/testmmiotrace.c
@@ -1,5 +1,5 @@
/*
- * Written by Pekka Paalanen, 2008 <pq@xxxxxx>
+ * Written by Pekka Paalanen, 2008-2009 <pq@xxxxxx>
*/
#include <linux/module.h>
#include <linux/io.h>
@@ -11,28 +11,51 @@ static unsigned long mmio_address;
module_param(mmio_address, ulong, 0);
MODULE_PARM_DESC(mmio_address, "Start address of the mapping of 16 kB.");
+static unsigned v16(unsigned i)
+{
+ return i * 12 + 7;
+}
+
+static unsigned v32(unsigned i)
+{
+ return i * 212371 + 13;
+}
+
static void do_write_test(void __iomem *p)
{
unsigned int i;
mmiotrace_printk("Write test.\n");
+
for (i = 0; i < 256; i++)
iowrite8(i, p + i);
+
for (i = 1024; i < (5 * 1024); i += 2)
- iowrite16(i * 12 + 7, p + i);
+ iowrite16(v16(i), p + i);
+
for (i = (5 * 1024); i < (16 * 1024); i += 4)
- iowrite32(i * 212371 + 13, p + i);
+ iowrite32(v32(i), p + i);
}
static void do_read_test(void __iomem *p)
{
unsigned int i;
+ unsigned errs[3] = { 0 };
mmiotrace_printk("Read test.\n");
+
for (i = 0; i < 256; i++)
- ioread8(p + i);
+ if (ioread8(p + i) != i)
+ ++errs[0];
+
for (i = 1024; i < (5 * 1024); i += 2)
- ioread16(p + i);
+ if (ioread16(p + i) != v16(i))
+ ++errs[1];
+
for (i = (5 * 1024); i < (16 * 1024); i += 4)
- ioread32(p + i);
+ if (ioread32(p + i) != v32(i))
+ ++errs[2];
+
+ mmiotrace_printk("Read errors: 8-bit %d, 16-bit %d, 32-bit %d.\n",
+ errs[0], errs[1], errs[2]);
}
static void do_test(void)
--
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