/*
* PowerPC hash table management proc entry. Will show information
* about the current hash table and will allow changes to it.
*
* Written by Cort Dougan (cort@cs.nmt.edu)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
#include <linux/sysctl.h>
#include <linux/capability.h>
#include <linux/ctype.h>
#include <linux/threads.h>
#include <linux/seq_file.h>
#include <linux/init.h>
#include <linux/bitops.h>
#include <asm/uaccess.h>
#include <asm/mmu.h>
#include <asm/residual.h>
#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/cputable.h>
#include <asm/system.h>
#include <asm/reg.h>
static int ppc_htab_show(struct seq_file *m, void *v);
static ssize_t ppc_htab_write(struct file * file, const char __user * buffer,
size_t count, loff_t *ppos);
extern PTE *Hash, *Hash_end;
extern unsigned long Hash_size, Hash_mask;
extern unsigned long _SDR1;
extern unsigned long htab_reloads;
extern unsigned long htab_preloads;
extern unsigned long htab_evicts;
extern unsigned long pte_misses;
extern unsigned long pte_errors;
extern unsigned int primary_pteg_full;
extern unsigned int htab_hash_searches;
static int ppc_htab_open(struct inode *inode, struct file *file)
{
return single_open(file, ppc_htab_show, NULL);
}
const struct file_operations ppc_htab_operations = {
.open = ppc_htab_open,
.read = seq_read,
.llseek = seq_lseek,
.write = ppc_htab_write,
.release = single_release,
};
static char *pmc1_lookup(unsigned long mmcr0)
{
switch ( mmcr0 & (0x7f<<7) )
{
case 0x0:
return "none";
case MMCR0_PMC1_CYCLES:
return "cycles";
case MMCR0_PMC1_ICACHEMISS:
return "ic miss";
case MMCR0_PMC1_DTLB:
return "dtlb miss";
default:
return "unknown";
}
}
static char *pmc2_lookup(unsigned long mmcr0)
{
switch ( mmcr0 & 0x3f )
{
case 0x0:
return "none";
case MMCR0_PMC2_CYCLES:
return "cycles";
case MMCR0_PMC2_DCACHEMISS:
return "dc miss";
case MMCR0_PMC2_ITLB:
return "itlb miss";
case MMCR0_PMC2_LOADMISSTIME:
return "load miss time";
default:
return "unknown";
}
}
/*
* print some useful info about the hash table. This function
* is _REALLY_ slow (see the nested for loops below) but nothing
* in here should be really timing critical. -- Cort
*/
static int ppc_htab_show(struct seq_file *m, void *v)
{
unsigned long mmcr0 = 0, pmc1 = 0, pmc2 = 0;
#if defined(CONFIG_PPC_STD_MMU)
unsigned int kptes = 0, uptes = 0;
PTE *ptr;
#endif /* CONFIG_PPC_STD_MMU */
if (cpu_has_feature(CPU_FTR_604_PERF_MON)) {
mmcr0 = mfspr(SPRN_MMCR0);
pmc1 = mfspr(SPRN_PMC1);
pmc2 = mfspr(SPRN_PMC2);
seq_printf(m,
"604 Performance Monitoring\n"
"MMCR0\t\t: %08lx %s%s ",
mmcr0,
( mmcr0>>28 & 0x2 ) ? "(user mode counted)" : "",
( mmcr0>>28 & 0x4 ) ? "(kernel mode counted)" : "");
seq_printf(m,
"\nPMC1\t\t: %08lx (%s)\n"
"PMC2\t\t: %08lx (%s)\n",
pmc1, pmc1_lookup(mmcr0),
pmc2, pmc2_lookup(mmcr0));
}
#ifdef CONFIG_PPC_STD_MMU
/* if we don't have a htab */
if ( Hash_size == 0 ) {
seq_printf(m, "No Hash Table used\n");
return 0;
}
for (ptr = Hash; ptr < Hash_end; ptr++) {
unsigned int mctx, vsid;
if (!ptr->v)
continue;
/* undo the esid skew */
vsid = ptr->vsid;
mctx = ((vsid - (vsid & 0xf) * 0x111) >> 4) & 0xfffff;
if (mctx == 0)
kptes++;
else
uptes++;
}
seq_printf(m,
"PTE Hash Table Information\n"
"Size\t\t: %luKb\n"
"Buckets\t\t: %lu\n"
"Address\t\t: %08lx\n"
"Entries\t\t: %lu\n"
"User ptes\t: %u\n"
"Kernel ptes\t: %u\n"
"Percent full\t: %lu%%\n"
, (unsigned long)(Hash_size>>10),
(Hash_size/(sizeof(PTE)*8)),
(unsigned long)Hash,
Hash_size/sizeof(PTE)
, uptes,
kptes,
((kptes+uptes)*100) / (Hash_size/sizeof(PTE))
);
seq_printf(m,
"Reloads\t\t: %lu\n"
"Preloads\t: %lu\n"
"Searches\t: %u\n"
"Overflows\t: %u\n"
"Evicts\t\t: %lu\n",
htab_reloads, htab_preloads, htab_hash_searches,
primary_pteg_full, htab_evicts);
#endif /* CONFIG_PPC_STD_MMU */
seq_printf(m,
"Non-error misses: %lu\n"
"Error misses\t: %lu\n",
pte_misses, pte_errors);
return 0;
}
/*
* Allow user to define performance counters and resize the hash table
*/
static ssize_t ppc_htab_write(struct file * file, const char __user * ubuffer,
size_t count, loff_t *ppos)
{
#ifdef CONFIG_PPC_STD_MMU
unsigned long tmp;
char buffer[16];
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (strncpy_from_user(buffer, ubuffer, 15))
return -EFAULT;
buffer[15] = 0;
/* don't set the htab size for now */
if ( !strncmp( buffer, "size ", 5) )
return -EBUSY;
if ( !strncmp( buffer, "reset", 5) )
{
if (cpu_has_feature(CPU_FTR_604_PERF_MON)) {
/* reset PMC1 and PMC2 */
mtspr(SPRN_PMC1, 0);
mtspr(SPRN_PMC2, 0);
}
htab_reloads = 0;
htab_evicts = 0;
pte_misses = 0;
pte_errors = 0;
}
/* Everything below here requires the performance monitor feature. */
if (!cpu_has_feature(CPU_FTR_604_PERF_MON))
return count;
/* turn off performance monitoring */
if ( !strncmp( buffer, "off", 3) )
{
mtspr(SPRN_MMCR0, 0);
mtspr(SPRN_PMC1, 0);
mtspr(SPRN_PMC2, 0);
}
if ( !strncmp( buffer, "user", 4) )
{
/* setup mmcr0 and clear the correct pmc */
tmp = (mfspr(SPRN_MMCR0) & ~(0x60000000)) | 0x20000000;
mtspr(SPRN_MMCR0, tmp);
mtspr(SPRN_PMC1, 0);
mtspr(SPRN_PMC2, 0);
}
if ( !strncmp( buffer, "kernel", 6) )
{
/* setup mmcr0 and clear the correct pmc */
tmp = (mfspr(SPRN_MMCR0) & ~(0x60000000)) | 0x40000000;
mtspr(SPRN_MMCR0, tmp);
mtspr(SPRN_PMC1, 0);
mtspr(SPRN_PMC2, 0);
}
/* PMC1 values */
if ( !strncmp( buffer, "dtlb", 4) )
{
/* setup mmcr0 and clear the correct pmc */
tmp = (mfspr(SPRN_MMCR0) & ~(0x7F << 7)) | MMCR0_PMC1_DTLB;
mtspr(SPRN_MMCR0, tmp);
mtspr(SPRN_PMC1, 0);
}
if ( !strncmp( buffer, "ic miss", 7) )
{
/* setup mmcr0 and clear the correct pmc */
tmp = (mfspr(SPRN_MMCR0) & ~(0x7F<<7)) | MMCR0_PMC1_ICACHEMISS;
mtspr(SPRN_MMCR0, tmp);
mtspr(SPRN_PMC1, 0);
}
/* PMC2 values */
if ( !strncmp( buffer, "load miss time", 14) )
{
/* setup mmcr0 and clear the correct pmc */
asm volatile(
"mfspr %0,%1\n\t" /* get current mccr0 */
"rlwinm %0,%0,0,0,31-6\n\t" /* clear bits [26-31] */
"ori %0,%0,%2 \n\t" /* or in mmcr0 settings */
"mtspr %1,%0 \n\t" /* set new mccr0 */
"mtspr %3,%4 \n\t" /* reset the pmc */
: "=r" (tmp)
: "i" (SPRN_MMCR0),
"i" (MMCR0_PMC2_LOADMISSTIME),
"i" (SPRN_PMC2), "r" (0) );
}
if ( !strncmp( buffer, "itlb", 4) )
{
/* setup mmcr0 and clear the correct pmc */
asm volatile(
"mfspr %0,%1\n\t" /* get current mccr0 */
"rlwinm %0,%0,0,0,31-6\n\t" /* clear bits [26-31] */
"ori %0,%0,%2 \n\t" /* or in mmcr0 settings */
"mtspr %1,%0 \n\t" /* set new mccr0 */
"mtspr %3,%4 \n\t" /* reset the pmc */
: "=r" (tmp)
: "i" (SPRN_MMCR0), "i" (MMCR0_PMC2_ITLB),
"i" (SPRN_PMC2), "r" (0) );
}
if ( !strncmp( buffer, "dc miss", 7) )
{
/* setup mmcr0 and clear the correct pmc */
asm volatile(
"mfspr %0,%1\n\t" /* get current mccr0 */
"rlwinm %0,%0,0,0,31-6\n\t" /* clear bits [26-31] */
"ori %0,%0,%2 \n\t" /* or in mmcr0 settings */
"mtspr %1,%0 \n\t" /* set new mccr0 */
"mtspr %3,%4 \n\t" /* reset the pmc */
: "=r" (tmp)
: "i" (SPRN_MMCR0), "i" (MMCR0_PMC2_DCACHEMISS),
"i" (SPRN_PMC2), "r" (0) );
}
return count;
#else /* CONFIG_PPC_STD_MMU */
return 0;
#endif /* CONFIG_PPC_STD_MMU */
}
int proc_dol2crvec(ctl_table *table, int write, struct file *filp,
void __user *buffer_arg, size_t *lenp, loff_t *ppos)
{
int vleft, first=1, len, left, val;
char __user *buffer = (char __user *) buffer_arg;
#define TMPBUFLEN 256
char buf[TMPBUFLEN], *p;
static const char *sizestrings[4] = {
"2MB", "256KB", "512KB", "1MB"
};
static const char *clockstrings[8] = {
"clock disabled", "+1 clock", "+1.5 clock", "reserved(3)",
"+2 clock", "+2.5 clock", "+3 clock", "reserved(7)"
};
static const char *typestrings[4] = {
"flow-through burst SRAM", "reserved SRAM",
"pipelined burst SRAM", "pipelined late-write SRAM"
};
static const char *holdstrings[4] = {
"0.5", "1.0", "(reserved2)", "(reserved3)"
};
if (!cpu_has_feature(CPU_FTR_L2CR))
return -EFAULT;
if ( /*!table->maxlen ||*/ (*ppos && !write)) {
*lenp = 0;
return 0;
}
vleft = table->maxlen / sizeof(int);
left = *lenp;
for (; left /*&& vleft--*/; first=0) {
if (write) {
while (left) {
char c;
if(get_user(c, buffer))
return -EFAULT;
if (!isspace(c))
break;
left--;
buffer++;
}
if (!left)
break;
len = left;
if (len > TMPBUFLEN-1)
len = TMPBUFLEN-1;
if(copy_from_user(buf, buffer, len))
return -EFAULT;
buf[len] = 0;
p = buf;
if (*p < '0' || *p > '9')
break;
val = simple_strtoul(p, &p, 0);
len = p-buf;
if ((len < left) && *p && !isspace(*p))
break;
buffer += len;
left -= len;
_set_L2CR(val);
} else {
p = buf;
if (!first)
*p++ = '\t';
val = _get_L2CR();
p += sprintf(p, "0x%08x: ", val);
p += sprintf(p, " %s", (val >> 31) & 1 ? "enabled" :
"disabled");
p += sprintf(p, ", %sparity", (val>>30)&1 ? "" : "no ");
p += sprintf(p, ", %s", sizestrings[(val >> 28) & 3]);
p += sprintf(p, ", %s", clockstrings[(val >> 25) & 7]);
p += sprintf(p, ", %s", typestrings[(val >> 23) & 2]);
p += sprintf(p, "%s", (val>>22)&1 ? ", data only" : "");
p += sprintf(p, "%s", (val>>20)&1 ? ", ZZ enabled": "");
p += sprintf(p, ", %s", (val>>19)&1 ? "write-through" :
"copy-back");
p += sprintf(p, "%s", (val>>18)&1 ? ", testing" : "");
p += sprintf(p, ", %sns hold",holdstrings[(val>>16)&3]);
p += sprintf(p, "%s", (val>>15)&1 ? ", DLL slow" : "");
p += sprintf(p, "%s", (val>>14)&1 ? ", diff clock" :"");
p += sprintf(p, "%s", (val>>13)&1 ? ", DLL bypass" :"");
p += sprintf(p,"\n");
len = strlen(buf);
if (len > left)
len = left;
if (copy_to_user(buffer, buf, len))
return -EFAULT;
left -= len;
buffer += len;
break;
}
}
if (!write && !first && left) {
if(put_user('\n', (char __user *) buffer))
return -EFAULT;
left--, buffer++;
}
if (write) {
char __user *s = (char __user *) buffer;
while (left) {
char c;
if(get_user(c, s++))
return -EFAULT;
if (!isspace(c))
break;
left--;
}
}
if (write && first)
return -EINVAL;
*lenp -= left;
*ppos += *lenp;
return 0;
}
#ifdef CONFIG_SYSCTL
/*
* Register our sysctl.
*/
static ctl_table htab_ctl_table[]={
{
.ctl_name = KERN_PPC_L2CR,
.procname = "l2cr",
.mode = 0644,
.proc_handler = &proc_dol2crvec,
},
{}
};
static ctl_table htab_sysctl_root[] = {
{
.ctl_name = CTL_KERN,
.procname = "kernel",
.mode = 0555,
.child = htab_ctl_table,
},
{}
};
static int __init
register_ppc_htab_sysctl(void)
{
register_sysctl_table(htab_sysctl_root);
return 0;
}
__initcall(register_ppc_htab_sysctl);
#endif
