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x86: count errors in testmmiotrace.ko

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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@iki.fi>
Cc: Stuart Bennett <stuart@freedesktop.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Pekka Paalanen 2009-03-01 16:09:14 +02:00 committed by Ingo Molnar
parent 778ef1e6cb
commit fab852aaf7
1 changed files with 29 additions and 6 deletions
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35
arch/x86/mm/testmmiotrace.c
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@ -1,5 +1,5 @@
/*
* Written by Pekka Paalanen, 2008 <pq@iki.fi>
* Written by Pekka Paalanen, 2008-2009 <pq@iki.fi>
*/
#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)