mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-21 00:42:16 +00:00
9e57fb35d7
Offer mmiotrace users a function to inject markers from inside the kernel. This depends on the trace_vprintk() patch. Signed-off-by: Pekka Paalanen <pq@iki.fi> Acked-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
76 lines
1.7 KiB
C
76 lines
1.7 KiB
C
/*
|
|
* Written by Pekka Paalanen, 2008 <pq@iki.fi>
|
|
*/
|
|
#include <linux/module.h>
|
|
#include <linux/io.h>
|
|
#include <linux/mmiotrace.h>
|
|
|
|
#define MODULE_NAME "testmmiotrace"
|
|
|
|
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 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);
|
|
for (i = (5 * 1024); i < (16 * 1024); i += 4)
|
|
iowrite32(i * 212371 + 13, p + i);
|
|
}
|
|
|
|
static void do_read_test(void __iomem *p)
|
|
{
|
|
unsigned int i;
|
|
mmiotrace_printk("Read test.\n");
|
|
for (i = 0; i < 256; i++)
|
|
ioread8(p + i);
|
|
for (i = 1024; i < (5 * 1024); i += 2)
|
|
ioread16(p + i);
|
|
for (i = (5 * 1024); i < (16 * 1024); i += 4)
|
|
ioread32(p + i);
|
|
}
|
|
|
|
static void do_test(void)
|
|
{
|
|
void __iomem *p = ioremap_nocache(mmio_address, 0x4000);
|
|
if (!p) {
|
|
pr_err(MODULE_NAME ": could not ioremap, aborting.\n");
|
|
return;
|
|
}
|
|
mmiotrace_printk("ioremap returned %p.\n", p);
|
|
do_write_test(p);
|
|
do_read_test(p);
|
|
iounmap(p);
|
|
}
|
|
|
|
static int __init init(void)
|
|
{
|
|
if (mmio_address == 0) {
|
|
pr_err(MODULE_NAME ": you have to use the module argument "
|
|
"mmio_address.\n");
|
|
pr_err(MODULE_NAME ": DO NOT LOAD THIS MODULE UNLESS"
|
|
" YOU REALLY KNOW WHAT YOU ARE DOING!\n");
|
|
return -ENXIO;
|
|
}
|
|
|
|
pr_warning(MODULE_NAME ": WARNING: mapping 16 kB @ 0x%08lx "
|
|
"in PCI address space, and writing "
|
|
"rubbish in there.\n", mmio_address);
|
|
do_test();
|
|
return 0;
|
|
}
|
|
|
|
static void __exit cleanup(void)
|
|
{
|
|
pr_debug(MODULE_NAME ": unloaded.\n");
|
|
}
|
|
|
|
module_init(init);
|
|
module_exit(cleanup);
|
|
MODULE_LICENSE("GPL");
|