manual update from upstream:
[linux-2.6] / arch / ppc / kernel / ppc_htab.c
1 /*
2  * PowerPC hash table management proc entry.  Will show information
3  * about the current hash table and will allow changes to it.
4  *
5  * Written by Cort Dougan (cort@cs.nmt.edu)
6  *
7  * This program is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU General Public License
9  * as published by the Free Software Foundation; either version
10  * 2 of the License, or (at your option) any later version.
11  */
12
13 #include <linux/config.h>
14 #include <linux/errno.h>
15 #include <linux/sched.h>
16 #include <linux/proc_fs.h>
17 #include <linux/stat.h>
18 #include <linux/sysctl.h>
19 #include <linux/ctype.h>
20 #include <linux/threads.h>
21 #include <linux/smp_lock.h>
22 #include <linux/seq_file.h>
23 #include <linux/init.h>
24 #include <linux/bitops.h>
25
26 #include <asm/uaccess.h>
27 #include <asm/mmu.h>
28 #include <asm/residual.h>
29 #include <asm/io.h>
30 #include <asm/pgtable.h>
31 #include <asm/cputable.h>
32 #include <asm/system.h>
33 #include <asm/reg.h>
34
35 static int ppc_htab_show(struct seq_file *m, void *v);
36 static ssize_t ppc_htab_write(struct file * file, const char __user * buffer,
37                               size_t count, loff_t *ppos);
38 extern PTE *Hash, *Hash_end;
39 extern unsigned long Hash_size, Hash_mask;
40 extern unsigned long _SDR1;
41 extern unsigned long htab_reloads;
42 extern unsigned long htab_preloads;
43 extern unsigned long htab_evicts;
44 extern unsigned long pte_misses;
45 extern unsigned long pte_errors;
46 extern unsigned int primary_pteg_full;
47 extern unsigned int htab_hash_searches;
48
49 static int ppc_htab_open(struct inode *inode, struct file *file)
50 {
51         return single_open(file, ppc_htab_show, NULL);
52 }
53
54 struct file_operations ppc_htab_operations = {
55         .open           = ppc_htab_open,
56         .read           = seq_read,
57         .llseek         = seq_lseek,
58         .write          = ppc_htab_write,
59         .release        = single_release,
60 };
61
62 static char *pmc1_lookup(unsigned long mmcr0)
63 {
64         switch ( mmcr0 & (0x7f<<7) )
65         {
66         case 0x0:
67                 return "none";
68         case MMCR0_PMC1_CYCLES:
69                 return "cycles";
70         case MMCR0_PMC1_ICACHEMISS:
71                 return "ic miss";
72         case MMCR0_PMC1_DTLB:
73                 return "dtlb miss";
74         default:
75                 return "unknown";
76         }
77 }
78
79 static char *pmc2_lookup(unsigned long mmcr0)
80 {
81         switch ( mmcr0 & 0x3f )
82         {
83         case 0x0:
84                 return "none";
85         case MMCR0_PMC2_CYCLES:
86                 return "cycles";
87         case MMCR0_PMC2_DCACHEMISS:
88                 return "dc miss";
89         case MMCR0_PMC2_ITLB:
90                 return "itlb miss";
91         case MMCR0_PMC2_LOADMISSTIME:
92                 return "load miss time";
93         default:
94                 return "unknown";
95         }
96 }
97
98 /*
99  * print some useful info about the hash table.  This function
100  * is _REALLY_ slow (see the nested for loops below) but nothing
101  * in here should be really timing critical. -- Cort
102  */
103 static int ppc_htab_show(struct seq_file *m, void *v)
104 {
105         unsigned long mmcr0 = 0, pmc1 = 0, pmc2 = 0;
106 #if defined(CONFIG_PPC_STD_MMU) && !defined(CONFIG_PPC64BRIDGE)
107         unsigned int kptes = 0, uptes = 0;
108         PTE *ptr;
109 #endif /* CONFIG_PPC_STD_MMU */
110
111         if (cpu_has_feature(CPU_FTR_604_PERF_MON)) {
112                 mmcr0 = mfspr(SPRN_MMCR0);
113                 pmc1 = mfspr(SPRN_PMC1);
114                 pmc2 = mfspr(SPRN_PMC2);
115                 seq_printf(m,
116                               "604 Performance Monitoring\n"
117                               "MMCR0\t\t: %08lx %s%s ",
118                               mmcr0,
119                               ( mmcr0>>28 & 0x2 ) ? "(user mode counted)" : "",
120                               ( mmcr0>>28 & 0x4 ) ? "(kernel mode counted)" : "");
121                 seq_printf(m,
122                               "\nPMC1\t\t: %08lx (%s)\n"
123                               "PMC2\t\t: %08lx (%s)\n",
124                               pmc1, pmc1_lookup(mmcr0),
125                               pmc2, pmc2_lookup(mmcr0));
126         }
127
128 #ifdef CONFIG_PPC_STD_MMU
129         /* if we don't have a htab */
130         if ( Hash_size == 0 ) {
131                 seq_printf(m, "No Hash Table used\n");
132                 return 0;
133         }
134
135 #ifndef CONFIG_PPC64BRIDGE
136         for (ptr = Hash; ptr < Hash_end; ptr++) {
137                 unsigned int mctx, vsid;
138
139                 if (!ptr->v)
140                         continue;
141                 /* undo the esid skew */
142                 vsid = ptr->vsid;
143                 mctx = ((vsid - (vsid & 0xf) * 0x111) >> 4) & 0xfffff;
144                 if (mctx == 0)
145                         kptes++;
146                 else
147                         uptes++;
148         }
149 #endif
150
151         seq_printf(m,
152                       "PTE Hash Table Information\n"
153                       "Size\t\t: %luKb\n"
154                       "Buckets\t\t: %lu\n"
155                       "Address\t\t: %08lx\n"
156                       "Entries\t\t: %lu\n"
157 #ifndef CONFIG_PPC64BRIDGE
158                       "User ptes\t: %u\n"
159                       "Kernel ptes\t: %u\n"
160                       "Percent full\t: %lu%%\n"
161 #endif
162                       , (unsigned long)(Hash_size>>10),
163                       (Hash_size/(sizeof(PTE)*8)),
164                       (unsigned long)Hash,
165                       Hash_size/sizeof(PTE)
166 #ifndef CONFIG_PPC64BRIDGE
167                       , uptes,
168                       kptes,
169                       ((kptes+uptes)*100) / (Hash_size/sizeof(PTE))
170 #endif
171                 );
172
173         seq_printf(m,
174                       "Reloads\t\t: %lu\n"
175                       "Preloads\t: %lu\n"
176                       "Searches\t: %u\n"
177                       "Overflows\t: %u\n"
178                       "Evicts\t\t: %lu\n",
179                       htab_reloads, htab_preloads, htab_hash_searches,
180                       primary_pteg_full, htab_evicts);
181 #endif /* CONFIG_PPC_STD_MMU */
182
183         seq_printf(m,
184                       "Non-error misses: %lu\n"
185                       "Error misses\t: %lu\n",
186                       pte_misses, pte_errors);
187         return 0;
188 }
189
190 /*
191  * Allow user to define performance counters and resize the hash table
192  */
193 static ssize_t ppc_htab_write(struct file * file, const char __user * ubuffer,
194                               size_t count, loff_t *ppos)
195 {
196 #ifdef CONFIG_PPC_STD_MMU
197         unsigned long tmp;
198         char buffer[16];
199
200         if (!capable(CAP_SYS_ADMIN))
201                 return -EACCES;
202         if (strncpy_from_user(buffer, ubuffer, 15))
203                 return -EFAULT;
204         buffer[15] = 0;
205
206         /* don't set the htab size for now */
207         if ( !strncmp( buffer, "size ", 5) )
208                 return -EBUSY;
209
210         if ( !strncmp( buffer, "reset", 5) )
211         {
212                 if (cpu_has_feature(CPU_FTR_604_PERF_MON)) {
213                         /* reset PMC1 and PMC2 */
214                         mtspr(SPRN_PMC1, 0);
215                         mtspr(SPRN_PMC2, 0);
216                 }
217                 htab_reloads = 0;
218                 htab_evicts = 0;
219                 pte_misses = 0;
220                 pte_errors = 0;
221         }
222
223         /* Everything below here requires the performance monitor feature. */
224         if (!cpu_has_feature(CPU_FTR_604_PERF_MON))
225                 return count;
226
227         /* turn off performance monitoring */
228         if ( !strncmp( buffer, "off", 3) )
229         {
230                 mtspr(SPRN_MMCR0, 0);
231                 mtspr(SPRN_PMC1, 0);
232                 mtspr(SPRN_PMC2, 0);
233         }
234
235         if ( !strncmp( buffer, "user", 4) )
236         {
237                 /* setup mmcr0 and clear the correct pmc */
238                 tmp = (mfspr(SPRN_MMCR0) & ~(0x60000000)) | 0x20000000;
239                 mtspr(SPRN_MMCR0, tmp);
240                 mtspr(SPRN_PMC1, 0);
241                 mtspr(SPRN_PMC2, 0);
242         }
243
244         if ( !strncmp( buffer, "kernel", 6) )
245         {
246                 /* setup mmcr0 and clear the correct pmc */
247                 tmp = (mfspr(SPRN_MMCR0) & ~(0x60000000)) | 0x40000000;
248                 mtspr(SPRN_MMCR0, tmp);
249                 mtspr(SPRN_PMC1, 0);
250                 mtspr(SPRN_PMC2, 0);
251         }
252
253         /* PMC1 values */
254         if ( !strncmp( buffer, "dtlb", 4) )
255         {
256                 /* setup mmcr0 and clear the correct pmc */
257                 tmp = (mfspr(SPRN_MMCR0) & ~(0x7F << 7)) | MMCR0_PMC1_DTLB;
258                 mtspr(SPRN_MMCR0, tmp);
259                 mtspr(SPRN_PMC1, 0);
260         }
261
262         if ( !strncmp( buffer, "ic miss", 7) )
263         {
264                 /* setup mmcr0 and clear the correct pmc */
265                 tmp = (mfspr(SPRN_MMCR0) & ~(0x7F<<7)) | MMCR0_PMC1_ICACHEMISS;
266                 mtspr(SPRN_MMCR0, tmp);
267                 mtspr(SPRN_PMC1, 0);
268         }
269
270         /* PMC2 values */
271         if ( !strncmp( buffer, "load miss time", 14) )
272         {
273                 /* setup mmcr0 and clear the correct pmc */
274                asm volatile(
275                        "mfspr %0,%1\n\t"     /* get current mccr0 */
276                        "rlwinm %0,%0,0,0,31-6\n\t"  /* clear bits [26-31] */
277                        "ori   %0,%0,%2 \n\t" /* or in mmcr0 settings */
278                        "mtspr %1,%0 \n\t"    /* set new mccr0 */
279                        "mtspr %3,%4 \n\t"    /* reset the pmc */
280                        : "=r" (tmp)
281                        : "i" (SPRN_MMCR0),
282                        "i" (MMCR0_PMC2_LOADMISSTIME),
283                        "i" (SPRN_PMC2),  "r" (0) );
284         }
285
286         if ( !strncmp( buffer, "itlb", 4) )
287         {
288                 /* setup mmcr0 and clear the correct pmc */
289                asm volatile(
290                        "mfspr %0,%1\n\t"     /* get current mccr0 */
291                        "rlwinm %0,%0,0,0,31-6\n\t"  /* clear bits [26-31] */
292                        "ori   %0,%0,%2 \n\t" /* or in mmcr0 settings */
293                        "mtspr %1,%0 \n\t"    /* set new mccr0 */
294                        "mtspr %3,%4 \n\t"    /* reset the pmc */
295                        : "=r" (tmp)
296                        : "i" (SPRN_MMCR0), "i" (MMCR0_PMC2_ITLB),
297                        "i" (SPRN_PMC2),  "r" (0) );
298         }
299
300         if ( !strncmp( buffer, "dc miss", 7) )
301         {
302                 /* setup mmcr0 and clear the correct pmc */
303                asm volatile(
304                        "mfspr %0,%1\n\t"     /* get current mccr0 */
305                        "rlwinm %0,%0,0,0,31-6\n\t"  /* clear bits [26-31] */
306                        "ori   %0,%0,%2 \n\t" /* or in mmcr0 settings */
307                        "mtspr %1,%0 \n\t"    /* set new mccr0 */
308                        "mtspr %3,%4 \n\t"    /* reset the pmc */
309                        : "=r" (tmp)
310                        : "i" (SPRN_MMCR0), "i" (MMCR0_PMC2_DCACHEMISS),
311                        "i" (SPRN_PMC2),  "r" (0) );
312         }
313
314         return count;
315 #else /* CONFIG_PPC_STD_MMU */
316         return 0;
317 #endif /* CONFIG_PPC_STD_MMU */
318 }
319
320 int proc_dol2crvec(ctl_table *table, int write, struct file *filp,
321                   void __user *buffer_arg, size_t *lenp, loff_t *ppos)
322 {
323         int vleft, first=1, len, left, val;
324         char __user *buffer = (char __user *) buffer_arg;
325         #define TMPBUFLEN 256
326         char buf[TMPBUFLEN], *p;
327         static const char *sizestrings[4] = {
328                 "2MB", "256KB", "512KB", "1MB"
329         };
330         static const char *clockstrings[8] = {
331                 "clock disabled", "+1 clock", "+1.5 clock", "reserved(3)",
332                 "+2 clock", "+2.5 clock", "+3 clock", "reserved(7)"
333         };
334         static const char *typestrings[4] = {
335                 "flow-through burst SRAM", "reserved SRAM",
336                 "pipelined burst SRAM", "pipelined late-write SRAM"
337         };
338         static const char *holdstrings[4] = {
339                 "0.5", "1.0", "(reserved2)", "(reserved3)"
340         };
341
342         if (!cpu_has_feature(CPU_FTR_L2CR))
343                 return -EFAULT;
344
345         if ( /*!table->maxlen ||*/ (*ppos && !write)) {
346                 *lenp = 0;
347                 return 0;
348         }
349
350         vleft = table->maxlen / sizeof(int);
351         left = *lenp;
352
353         for (; left /*&& vleft--*/; first=0) {
354                 if (write) {
355                         while (left) {
356                                 char c;
357                                 if(get_user(c, buffer))
358                                         return -EFAULT;
359                                 if (!isspace(c))
360                                         break;
361                                 left--;
362                                 buffer++;
363                         }
364                         if (!left)
365                                 break;
366                         len = left;
367                         if (len > TMPBUFLEN-1)
368                                 len = TMPBUFLEN-1;
369                         if(copy_from_user(buf, buffer, len))
370                                 return -EFAULT;
371                         buf[len] = 0;
372                         p = buf;
373                         if (*p < '0' || *p > '9')
374                                 break;
375                         val = simple_strtoul(p, &p, 0);
376                         len = p-buf;
377                         if ((len < left) && *p && !isspace(*p))
378                                 break;
379                         buffer += len;
380                         left -= len;
381                         _set_L2CR(val);
382                 } else {
383                         p = buf;
384                         if (!first)
385                                 *p++ = '\t';
386                         val = _get_L2CR();
387                         p += sprintf(p, "0x%08x: ", val);
388                         p += sprintf(p, " %s", (val >> 31) & 1 ? "enabled" :
389                                         "disabled");
390                         p += sprintf(p, ", %sparity", (val>>30)&1 ? "" : "no ");
391                         p += sprintf(p, ", %s", sizestrings[(val >> 28) & 3]);
392                         p += sprintf(p, ", %s", clockstrings[(val >> 25) & 7]);
393                         p += sprintf(p, ", %s", typestrings[(val >> 23) & 2]);
394                         p += sprintf(p, "%s", (val>>22)&1 ? ", data only" : "");
395                         p += sprintf(p, "%s", (val>>20)&1 ? ", ZZ enabled": "");
396                         p += sprintf(p, ", %s", (val>>19)&1 ? "write-through" :
397                                         "copy-back");
398                         p += sprintf(p, "%s", (val>>18)&1 ? ", testing" : "");
399                         p += sprintf(p, ", %sns hold",holdstrings[(val>>16)&3]);
400                         p += sprintf(p, "%s", (val>>15)&1 ? ", DLL slow" : "");
401                         p += sprintf(p, "%s", (val>>14)&1 ? ", diff clock" :"");
402                         p += sprintf(p, "%s", (val>>13)&1 ? ", DLL bypass" :"");
403
404                         p += sprintf(p,"\n");
405
406                         len = strlen(buf);
407                         if (len > left)
408                                 len = left;
409                         if (copy_to_user(buffer, buf, len))
410                                 return -EFAULT;
411                         left -= len;
412                         buffer += len;
413                         break;
414                 }
415         }
416
417         if (!write && !first && left) {
418                 if(put_user('\n', (char __user *) buffer))
419                         return -EFAULT;
420                 left--, buffer++;
421         }
422         if (write) {
423                 char __user *s = (char __user *) buffer;
424                 while (left) {
425                         char c;
426                         if(get_user(c, s++))
427                                 return -EFAULT;
428                         if (!isspace(c))
429                                 break;
430                         left--;
431                 }
432         }
433         if (write && first)
434                 return -EINVAL;
435         *lenp -= left;
436         *ppos += *lenp;
437         return 0;
438 }
439
440 #ifdef CONFIG_SYSCTL
441 /*
442  * Register our sysctl.
443  */
444 static ctl_table htab_ctl_table[]={
445         {
446                 .ctl_name       = KERN_PPC_L2CR,
447                 .procname       = "l2cr",
448                 .mode           = 0644,
449                 .proc_handler   = &proc_dol2crvec,
450         },
451         { 0, },
452 };
453 static ctl_table htab_sysctl_root[] = {
454         { 1, "kernel", NULL, 0, 0755, htab_ctl_table, },
455         { 0,},
456 };
457
458 static int __init
459 register_ppc_htab_sysctl(void)
460 {
461         register_sysctl_table(htab_sysctl_root, 0);
462
463         return 0;
464 }
465
466 __initcall(register_ppc_htab_sysctl);
467 #endif