mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-27 11:55:07 +07:00
4bdc0d676a
ioremap has provided non-cached semantics by default since the Linux 2.6 days, so remove the additional ioremap_nocache interface. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Arnd Bergmann <arnd@arndb.de>
147 lines
3.2 KiB
C
147 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Written by Pekka Paalanen, 2008-2009 <pq@iki.fi>
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/io.h>
|
|
#include <linux/mmiotrace.h>
|
|
#include <linux/security.h>
|
|
|
|
static unsigned long mmio_address;
|
|
module_param_hw(mmio_address, ulong, iomem, 0);
|
|
MODULE_PARM_DESC(mmio_address, " Start address of the mapping of 16 kB "
|
|
"(or 8 MB if read_far is non-zero).");
|
|
|
|
static unsigned long read_far = 0x400100;
|
|
module_param(read_far, ulong, 0);
|
|
MODULE_PARM_DESC(read_far, " Offset of a 32-bit read within 8 MB "
|
|
"(default: 0x400100).");
|
|
|
|
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;
|
|
pr_info("write test.\n");
|
|
mmiotrace_printk("Write test.\n");
|
|
|
|
for (i = 0; i < 256; i++)
|
|
iowrite8(i, p + i);
|
|
|
|
for (i = 1024; i < (5 * 1024); i += 2)
|
|
iowrite16(v16(i), p + i);
|
|
|
|
for (i = (5 * 1024); i < (16 * 1024); i += 4)
|
|
iowrite32(v32(i), p + i);
|
|
}
|
|
|
|
static void do_read_test(void __iomem *p)
|
|
{
|
|
unsigned int i;
|
|
unsigned errs[3] = { 0 };
|
|
pr_info("read test.\n");
|
|
mmiotrace_printk("Read test.\n");
|
|
|
|
for (i = 0; i < 256; i++)
|
|
if (ioread8(p + i) != i)
|
|
++errs[0];
|
|
|
|
for (i = 1024; i < (5 * 1024); i += 2)
|
|
if (ioread16(p + i) != v16(i))
|
|
++errs[1];
|
|
|
|
for (i = (5 * 1024); i < (16 * 1024); i += 4)
|
|
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_read_far_test(void __iomem *p)
|
|
{
|
|
pr_info("read far test.\n");
|
|
mmiotrace_printk("Read far test.\n");
|
|
|
|
ioread32(p + read_far);
|
|
}
|
|
|
|
static void do_test(unsigned long size)
|
|
{
|
|
void __iomem *p = ioremap(mmio_address, size);
|
|
if (!p) {
|
|
pr_err("could not ioremap, aborting.\n");
|
|
return;
|
|
}
|
|
mmiotrace_printk("ioremap returned %p.\n", p);
|
|
do_write_test(p);
|
|
do_read_test(p);
|
|
if (read_far && read_far < size - 4)
|
|
do_read_far_test(p);
|
|
iounmap(p);
|
|
}
|
|
|
|
/*
|
|
* Tests how mmiotrace behaves in face of multiple ioremap / iounmaps in
|
|
* a short time. We had a bug in deferred freeing procedure which tried
|
|
* to free this region multiple times (ioremap can reuse the same address
|
|
* for many mappings).
|
|
*/
|
|
static void do_test_bulk_ioremapping(void)
|
|
{
|
|
void __iomem *p;
|
|
int i;
|
|
|
|
for (i = 0; i < 10; ++i) {
|
|
p = ioremap(mmio_address, PAGE_SIZE);
|
|
if (p)
|
|
iounmap(p);
|
|
}
|
|
|
|
/* Force freeing. If it will crash we will know why. */
|
|
synchronize_rcu();
|
|
}
|
|
|
|
static int __init init(void)
|
|
{
|
|
unsigned long size = (read_far) ? (8 << 20) : (16 << 10);
|
|
int ret = security_locked_down(LOCKDOWN_MMIOTRACE);
|
|
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (mmio_address == 0) {
|
|
pr_err("you have to use the module argument mmio_address.\n");
|
|
pr_err("DO NOT LOAD THIS MODULE UNLESS YOU REALLY KNOW WHAT YOU ARE DOING!\n");
|
|
return -ENXIO;
|
|
}
|
|
|
|
pr_warn("WARNING: mapping %lu kB @ 0x%08lx in PCI address space, "
|
|
"and writing 16 kB of rubbish in there.\n",
|
|
size >> 10, mmio_address);
|
|
do_test(size);
|
|
do_test_bulk_ioremapping();
|
|
pr_info("All done.\n");
|
|
return 0;
|
|
}
|
|
|
|
static void __exit cleanup(void)
|
|
{
|
|
pr_debug("unloaded.\n");
|
|
}
|
|
|
|
module_init(init);
|
|
module_exit(cleanup);
|
|
MODULE_LICENSE("GPL");
|