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Commit fab852aa authored by Pekka Paalanen's avatar Pekka Paalanen Committed by Ingo Molnar
Browse files

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: default avatarPekka Paalanen <pq@iki.fi>
Cc: Stuart Bennett <stuart@freedesktop.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 778ef1e6

arch/x86/mm/testmmiotrace.c

+29 −6
Original line number Diff line number Diff line 
/*

 * 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)