summaryrefslogtreecommitdiff
path: root/arch/ppc/kernel/ppc_htab.c
blob: 77b20ff672b8b2de6264e65df2b00ed4fc852b70 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
/*
 * 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/smp_lock.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, 0);

	return 0;
}

__initcall(register_ppc_htab_sysctl);
#endif