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/*
* arch/sh/mm/tlb-debugfs.c
*
* debugfs ops for SH-4 ITLB/UTLBs.
*
* Copyright (C) 2010 Matt Fleming
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <asm/processor.h>
#include <asm/mmu_context.h>
#include <asm/tlbflush.h>
enum tlb_type {
TLB_TYPE_ITLB,
TLB_TYPE_UTLB,
};
static struct {
int bits;
const char *size;
} tlb_sizes[] = {
{ 0x0, " 1KB" },
{ 0x1, " 4KB" },
{ 0x2, " 8KB" },
{ 0x4, " 64KB" },
{ 0x5, "256KB" },
{ 0x7, " 1MB" },
{ 0x8, " 4MB" },
{ 0xc, " 64MB" },
};
static int tlb_seq_show(struct seq_file *file, void *iter)
{
unsigned int tlb_type = (unsigned int)file->private;
unsigned long addr1, addr2, data1, data2;
unsigned long flags;
unsigned long mmucr;
unsigned int nentries, entry;
unsigned int urb;
mmucr = __raw_readl(MMUCR);
if ((mmucr & 0x1) == 0) {
seq_printf(file, "address translation disabled\n");
return 0;
}
if (tlb_type == TLB_TYPE_ITLB) {
addr1 = MMU_ITLB_ADDRESS_ARRAY;
addr2 = MMU_ITLB_ADDRESS_ARRAY2;
data1 = MMU_ITLB_DATA_ARRAY;
data2 = MMU_ITLB_DATA_ARRAY2;
nentries = 4;
} else {
addr1 = MMU_UTLB_ADDRESS_ARRAY;
addr2 = MMU_UTLB_ADDRESS_ARRAY2;
data1 = MMU_UTLB_DATA_ARRAY;
data2 = MMU_UTLB_DATA_ARRAY2;
nentries = 64;
}
local_irq_save(flags);
jump_to_uncached();
urb = (mmucr & MMUCR_URB) >> MMUCR_URB_SHIFT;
/* Make the "entry >= urb" test fail. */
if (urb == 0)
urb = MMUCR_URB_NENTRIES + 1;
if (tlb_type == TLB_TYPE_ITLB) {
addr1 = MMU_ITLB_ADDRESS_ARRAY;
addr2 = MMU_ITLB_ADDRESS_ARRAY2;
data1 = MMU_ITLB_DATA_ARRAY;
data2 = MMU_ITLB_DATA_ARRAY2;
nentries = 4;
} else {
addr1 = MMU_UTLB_ADDRESS_ARRAY;
addr2 = MMU_UTLB_ADDRESS_ARRAY2;
data1 = MMU_UTLB_DATA_ARRAY;
data2 = MMU_UTLB_DATA_ARRAY2;
nentries = 64;
}
seq_printf(file, "entry: vpn ppn asid size valid wired\n");
for (entry = 0; entry < nentries; entry++) {
unsigned long vpn, ppn, asid, size;
unsigned long valid;
unsigned long val;
const char *sz = " ?";
int i;
val = __raw_readl(addr1 | (entry << MMU_TLB_ENTRY_SHIFT));
ctrl_barrier();
vpn = val & 0xfffffc00;
valid = val & 0x100;
val = __raw_readl(addr2 | (entry << MMU_TLB_ENTRY_SHIFT));
ctrl_barrier();
asid = val & MMU_CONTEXT_ASID_MASK;
val = __raw_readl(data1 | (entry << MMU_TLB_ENTRY_SHIFT));
ctrl_barrier();
ppn = (val & 0x0ffffc00) << 4;
val = __raw_readl(data2 | (entry << MMU_TLB_ENTRY_SHIFT));
ctrl_barrier();
size = (val & 0xf0) >> 4;
for (i = 0; i < ARRAY_SIZE(tlb_sizes); i++) {
if (tlb_sizes[i].bits == size)
break;
}
if (i != ARRAY_SIZE(tlb_sizes))
sz = tlb_sizes[i].size;
seq_printf(file, "%2d: 0x%08lx 0x%08lx %5lu %s %s %s\n",
entry, vpn, ppn, asid,
sz, valid ? "V" : "-",
(urb <= entry) ? "W" : "-");
}
back_to_cached();
local_irq_restore(flags);
return 0;
}
static int tlb_debugfs_open(struct inode *inode, struct file *file)
{
return single_open(file, tlb_seq_show, inode->i_private);
}
static const struct file_operations tlb_debugfs_fops = {
.owner = THIS_MODULE,
.open = tlb_debugfs_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int __init tlb_debugfs_init(void)
{
struct dentry *itlb, *utlb;
itlb = debugfs_create_file("itlb", S_IRUSR, sh_debugfs_root,
(unsigned int *)TLB_TYPE_ITLB,
&tlb_debugfs_fops);
if (unlikely(!itlb))
return -ENOMEM;
if (IS_ERR(itlb))
return PTR_ERR(itlb);
utlb = debugfs_create_file("utlb", S_IRUSR, sh_debugfs_root,
(unsigned int *)TLB_TYPE_UTLB,
&tlb_debugfs_fops);
if (unlikely(!utlb)) {
debugfs_remove(itlb);
return -ENOMEM;
}
if (IS_ERR(utlb)) {
debugfs_remove(itlb);
return PTR_ERR(utlb);
}
return 0;
}
module_init(tlb_debugfs_init);
MODULE_LICENSE("GPL v2");
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