ppc_htab.c
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上传日期:2013-02-24
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文件大小:15k
- /*
- * BK Id: SCCS/s.ppc_htab.c 1.19 10/16/01 15:58:42 trini
- */
- /*
- * 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/config.h>
- #include <linux/errno.h>
- #include <linux/sched.h>
- #include <linux/proc_fs.h>
- #include <linux/stat.h>
- #include <linux/sysctl.h>
- #include <linux/ctype.h>
- #include <linux/threads.h>
- #include <asm/uaccess.h>
- #include <asm/bitops.h>
- #include <asm/mmu.h>
- #include <asm/processor.h>
- #include <asm/residual.h>
- #include <asm/io.h>
- #include <asm/pgtable.h>
- #include <asm/cputable.h>
- #include <asm/system.h>
- static ssize_t ppc_htab_read(struct file * file, char * buf,
- size_t count, loff_t *ppos);
- static ssize_t ppc_htab_write(struct file * file, const char * buffer,
- size_t count, loff_t *ppos);
- static long long ppc_htab_lseek(struct file * file, loff_t offset, int orig);
- int proc_dol2crvec(ctl_table *table, int write, struct file *filp,
- void *buffer, size_t *lenp);
- 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;
- /* these will go into processor.h when I'm done debugging -- Cort */
- #define MMCR0 952
- #define MMCR0_PMC1_CYCLES (0x1<<7)
- #define MMCR0_PMC1_ICACHEMISS (0x5<<7)
- #define MMCR0_PMC1_DTLB (0x6<<7)
- #define MMCR0_PMC2_DCACHEMISS (0x6)
- #define MMCR0_PMC2_CYCLES (0x1)
- #define MMCR0_PMC2_ITLB (0x7)
- #define MMCR0_PMC2_LOADMISSTIME (0x5)
- #define PMC1 953
- #define PMC2 954
- struct file_operations ppc_htab_operations = {
- llseek: ppc_htab_lseek,
- read: ppc_htab_read,
- write: ppc_htab_write,
- };
- 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 ssize_t ppc_htab_read(struct file * file, char * buf,
- size_t count, loff_t *ppos)
- {
- unsigned long mmcr0 = 0, pmc1 = 0, pmc2 = 0;
- int n = 0;
- #ifdef CONFIG_PPC_STD_MMU
- int valid;
- unsigned int kptes = 0, uptes = 0, zombie_ptes = 0;
- PTE *ptr;
- struct task_struct *p;
- #endif /* CONFIG_PPC_STD_MMU */
- char buffer[512];
- if (count < 0)
- return -EINVAL;
- if (cur_cpu_spec[0]->cpu_features & CPU_FTR_604_PERF_MON) {
- asm volatile ("mfspr %0,952 nt"
- "mfspr %1,953 nt"
- "mfspr %2,954 nt"
- : "=r" (mmcr0), "=r" (pmc1), "=r" (pmc2) );
- n += sprintf( buffer + n,
- "604 Performance Monitoringn"
- "MMCR0tt: %08lx %s%s ",
- mmcr0,
- ( mmcr0>>28 & 0x2 ) ? "(user mode counted)" : "",
- ( mmcr0>>28 & 0x4 ) ? "(kernel mode counted)" : "");
- n += sprintf( buffer + n,
- "nPMC1tt: %08lx (%s)n"
- "PMC2tt: %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 )
- {
- n += sprintf( buffer + n, "No Hash Table usedn");
- goto return_string;
- }
- for ( ptr = Hash ; ptr < Hash_end ; ptr++)
- {
- unsigned int ctx, mctx, vsid;
- if (!ptr->v)
- continue;
- /* make sure someone is using this context/vsid */
- /* first undo the esid skew */
- vsid = ptr->vsid;
- mctx = ((vsid - (vsid & 0xf) * 0x111) >> 4) & 0xfffff;
- if (mctx == 0) {
- kptes++;
- continue;
- }
- /* now undo the context skew; 801921 * 897 == 1 mod 2^20 */
- ctx = (mctx * 801921) & 0xfffff;
- valid = 0;
- for_each_task(p) {
- if (p->mm != NULL && ctx == p->mm->context) {
- valid = 1;
- uptes++;
- break;
- }
- }
- if (!valid)
- zombie_ptes++;
- }
-
- n += sprintf( buffer + n,
- "PTE Hash Table Informationn"
- "Sizett: %luKbn"
- "Bucketstt: %lun"
- "Addresstt: %08lxn"
- "Entriestt: %lun"
- "User ptest: %un"
- "Kernel ptest: %un"
- "Zombiestt: %un"
- "Percent fullt: %lu%%n",
- (unsigned long)(Hash_size>>10),
- (Hash_size/(sizeof(PTE)*8)),
- (unsigned long)Hash,
- Hash_size/sizeof(PTE),
- uptes,
- kptes,
- zombie_ptes,
- ((kptes+uptes)*100) / (Hash_size/sizeof(PTE))
- );
- n += sprintf( buffer + n,
- "Reloadstt: %lun"
- "Preloadst: %lun"
- "Searchest: %un"
- "Overflowst: %un"
- "Evictstt: %lun",
- htab_reloads, htab_preloads, htab_hash_searches,
- primary_pteg_full, htab_evicts);
- return_string:
- #endif /* CONFIG_PPC_STD_MMU */
-
- n += sprintf( buffer + n,
- "Non-error misses: %lun"
- "Error missest: %lun",
- pte_misses, pte_errors);
- if (*ppos >= strlen(buffer))
- return 0;
- if (n > strlen(buffer) - *ppos)
- n = strlen(buffer) - *ppos;
- if (n > count)
- n = count;
- copy_to_user(buf, buffer + *ppos, n);
- *ppos += n;
- return n;
- }
- /*
- * Allow user to define performance counters and resize the hash table
- */
- static ssize_t ppc_htab_write(struct file * file, const char * buffer,
- size_t count, loff_t *ppos)
- {
- #ifdef CONFIG_PPC_STD_MMU
- unsigned long tmp;
- if ( current->uid != 0 )
- return -EACCES;
- /* don't set the htab size for now */
- if ( !strncmp( buffer, "size ", 5) )
- return -EBUSY;
- /* turn off performance monitoring */
- if ( !strncmp( buffer, "off", 3) )
- {
- if (cur_cpu_spec[0]->cpu_features & CPU_FTR_604_PERF_MON) {
- asm volatile ("mtspr %0, %3 nt"
- "mtspr %1, %3 nt"
- "mtspr %2, %3 nt"
- :: "i" (MMCR0), "i" (PMC1), "i" (PMC2), "r" (0));
- }
- }
- if ( !strncmp( buffer, "reset", 5) )
- {
- if (cur_cpu_spec[0]->cpu_features & CPU_FTR_604_PERF_MON) {
- /* reset PMC1 and PMC2 */
- asm volatile (
- "mtspr 953, %0 nt"
- "mtspr 954, %0 nt"
- :: "r" (0));
- }
- htab_reloads = 0;
- htab_evicts = 0;
- pte_misses = 0;
- pte_errors = 0;
- }
- if ( !strncmp( buffer, "user", 4) )
- {
- if (cur_cpu_spec[0]->cpu_features & CPU_FTR_604_PERF_MON) {
- /* setup mmcr0 and clear the correct pmc */
- asm("mfspr %0,%1nt" : "=r" (tmp) : "i" (MMCR0));
- tmp &= ~(0x60000000);
- tmp |= 0x20000000;
- asm volatile (
- "mtspr %1,%0 nt" /* set new mccr0 */
- "mtspr %3,%4 nt" /* reset the pmc */
- "mtspr %5,%4 nt" /* reset the pmc2 */
- :: "r" (tmp), "i" (MMCR0), "i" (0),
- "i" (PMC1), "r" (0), "i"(PMC2) );
- }
- }
- if ( !strncmp( buffer, "kernel", 6) )
- {
- if (cur_cpu_spec[0]->cpu_features & CPU_FTR_604_PERF_MON) {
- /* setup mmcr0 and clear the correct pmc */
- asm("mfspr %0,%1nt" : "=r" (tmp) : "i" (MMCR0));
- tmp &= ~(0x60000000);
- tmp |= 0x40000000;
- asm volatile (
- "mtspr %1,%0 nt" /* set new mccr0 */
- "mtspr %3,%4 nt" /* reset the pmc */
- "mtspr %5,%4 nt" /* reset the pmc2 */
- :: "r" (tmp), "i" (MMCR0), "i" (0),
- "i" (PMC1), "r" (0), "i"(PMC2) );
- }
- }
-
- /* PMC1 values */
- if ( !strncmp( buffer, "dtlb", 4) )
- {
- if (cur_cpu_spec[0]->cpu_features & CPU_FTR_604_PERF_MON) {
- /* setup mmcr0 and clear the correct pmc */
- asm("mfspr %0,%1nt" : "=r" (tmp) : "i" (MMCR0));
- tmp &= ~(0x7f<<7);
- tmp |= MMCR0_PMC1_DTLB;
- asm volatile (
- "mtspr %1,%0 nt" /* set new mccr0 */
- "mtspr %3,%4 nt" /* reset the pmc */
- :: "r" (tmp), "i" (MMCR0), "i" (MMCR0_PMC1_DTLB),
- "i" (PMC1), "r" (0) );
- }
- }
- if ( !strncmp( buffer, "ic miss", 7) )
- {
- if (cur_cpu_spec[0]->cpu_features & CPU_FTR_604_PERF_MON) {
- /* setup mmcr0 and clear the correct pmc */
- asm("mfspr %0,%1nt" : "=r" (tmp) : "i" (MMCR0));
- tmp &= ~(0x7f<<7);
- tmp |= MMCR0_PMC1_ICACHEMISS;
- asm volatile (
- "mtspr %1,%0 nt" /* set new mccr0 */
- "mtspr %3,%4 nt" /* reset the pmc */
- :: "r" (tmp), "i" (MMCR0),
- "i" (MMCR0_PMC1_ICACHEMISS), "i" (PMC1), "r" (0));
- }
- }
- /* PMC2 values */
- if ( !strncmp( buffer, "load miss time", 14) )
- {
- if (cur_cpu_spec[0]->cpu_features & CPU_FTR_604_PERF_MON) {
- /* setup mmcr0 and clear the correct pmc */
- asm volatile(
- "mfspr %0,%1nt" /* get current mccr0 */
- "rlwinm %0,%0,0,0,31-6nt" /* clear bits [26-31] */
- "ori %0,%0,%2 nt" /* or in mmcr0 settings */
- "mtspr %1,%0 nt" /* set new mccr0 */
- "mtspr %3,%4 nt" /* reset the pmc */
- : "=r" (tmp)
- : "i" (MMCR0), "i" (MMCR0_PMC2_LOADMISSTIME),
- "i" (PMC2), "r" (0) );
- }
- }
-
- if ( !strncmp( buffer, "itlb", 4) )
- {
- if (cur_cpu_spec[0]->cpu_features & CPU_FTR_604_PERF_MON) {
- /* setup mmcr0 and clear the correct pmc */
- asm volatile(
- "mfspr %0,%1nt" /* get current mccr0 */
- "rlwinm %0,%0,0,0,31-6nt" /* clear bits [26-31] */
- "ori %0,%0,%2 nt" /* or in mmcr0 settings */
- "mtspr %1,%0 nt" /* set new mccr0 */
- "mtspr %3,%4 nt" /* reset the pmc */
- : "=r" (tmp)
- : "i" (MMCR0), "i" (MMCR0_PMC2_ITLB),
- "i" (PMC2), "r" (0) );
- }
- }
- if ( !strncmp( buffer, "dc miss", 7) )
- {
- if (cur_cpu_spec[0]->cpu_features & CPU_FTR_604_PERF_MON) {
- /* setup mmcr0 and clear the correct pmc */
- asm volatile(
- "mfspr %0,%1nt" /* get current mccr0 */
- "rlwinm %0,%0,0,0,31-6nt" /* clear bits [26-31] */
- "ori %0,%0,%2 nt" /* or in mmcr0 settings */
- "mtspr %1,%0 nt" /* set new mccr0 */
- "mtspr %3,%4 nt" /* reset the pmc */
- : "=r" (tmp)
- : "i" (MMCR0), "i" (MMCR0_PMC2_DCACHEMISS),
- "i" (PMC2), "r" (0) );
- }
- }
-
- return count;
-
- #if 0 /* resizing htab is a bit difficult right now -- Cort */
- unsigned long size;
- extern void reset_SDR1(void);
-
- /* only know how to set size right now */
- if ( strncmp( buffer, "size ", 5) )
- return -EINVAL;
- size = simple_strtoul( &buffer[5], NULL, 10 );
-
- /* only allow to shrink */
- if ( size >= Hash_size>>10 )
- return -EINVAL;
- /* minimum size of htab */
- if ( size < 64 )
- return -EINVAL;
-
- /* make sure it's a multiple of 64k */
- if ( size % 64 )
- return -EINVAL;
-
- printk("Hash table resize to %lukn", size);
- /*
- * We need to rehash all kernel entries for the new htab size.
- * Kernel only since we do a flush_tlb_all(). Since it's kernel
- * we only need to bother with vsids 0-15. To avoid problems of
- * clobbering un-rehashed values we put the htab at a new spot
- * and put everything there.
- * -- Cort
- */
- Hash_size = size<<10;
- Hash_mask = (Hash_size >> 6) - 1;
- _SDR1 = __pa(Hash) | (Hash_mask >> 10);
- flush_tlb_all();
- reset_SDR1();
- #endif
- return count;
- #else /* CONFIG_PPC_STD_MMU */
- return 0;
- #endif /* CONFIG_PPC_STD_MMU */
- }
- static long long
- ppc_htab_lseek(struct file * file, loff_t offset, int orig)
- {
- switch (orig) {
- case 0:
- file->f_pos = offset;
- return(file->f_pos);
- case 1:
- file->f_pos += offset;
- return(file->f_pos);
- case 2:
- return(-EINVAL);
- default:
- return(-EINVAL);
- }
- }
- int proc_dol2crvec(ctl_table *table, int write, struct file *filp,
- void *buffer, size_t *lenp)
- {
- int vleft, first=1, len, left, val;
- #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 (!(cur_cpu_spec[0]->cpu_features & CPU_FTR_L2CR))
- return -EFAULT;
-
- if ( /*!table->maxlen ||*/ (filp->f_pos && !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,(char *) buffer))
- return -EFAULT;
- if (!isspace(c))
- break;
- left--;
- ((char *) 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 *) buffer))
- return -EFAULT;
- left--, buffer++;
- }
- if (write) {
- p = (char *) buffer;
- while (left) {
- char c;
- if(get_user(c, p++))
- return -EFAULT;
- if (!isspace(c))
- break;
- left--;
- }
- }
- if (write && first)
- return -EINVAL;
- *lenp -= left;
- filp->f_pos += *lenp;
- return 0;
- }