aboutsummaryrefslogtreecommitdiffstats
path: root/arch/powerpc/kernel/lparcfg.c
blob: 1e656b43ad7fb87f45a71c393e9f96ea5e18a504 (plain) (blame)
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
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
/*
 * PowerPC64 LPAR Configuration Information Driver
 *
 * Dave Engebretsen engebret@us.ibm.com
 *    Copyright (c) 2003 Dave Engebretsen
 * Will Schmidt willschm@us.ibm.com
 *    SPLPAR updates, Copyright (c) 2003 Will Schmidt IBM Corporation.
 *    seq_file updates, Copyright (c) 2004 Will Schmidt IBM Corporation.
 * Nathan Lynch nathanl@austin.ibm.com
 *    Added lparcfg_write, Copyright (C) 2004 Nathan Lynch IBM Corporation.
 *
 *      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.
 *
 * This driver creates a proc file at /proc/ppc64/lparcfg which contains
 * keyword - value pairs that specify the configuration of the partition.
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/proc_fs.h>
#include <linux/init.h>
#include <linux/seq_file.h>
#include <asm/uaccess.h>
#include <asm/iseries/hv_lp_config.h>
#include <asm/lppaca.h>
#include <asm/hvcall.h>
#include <asm/firmware.h>
#include <asm/rtas.h>
#include <asm/system.h>
#include <asm/time.h>
#include <asm/prom.h>
#include <asm/vdso_datapage.h>

#define MODULE_VERS "1.7"
#define MODULE_NAME "lparcfg"

/* #define LPARCFG_DEBUG */

static struct proc_dir_entry *proc_ppc64_lparcfg;

/*
 * Track sum of all purrs across all processors. This is used to further
 * calculate usage values by different applications
 */
static unsigned long get_purr(void)
{
	unsigned long sum_purr = 0;
	int cpu;

	for_each_possible_cpu(cpu) {
		if (firmware_has_feature(FW_FEATURE_ISERIES))
			sum_purr += lppaca[cpu].emulated_time_base;
		else {
			struct cpu_usage *cu;

			cu = &per_cpu(cpu_usage_array, cpu);
			sum_purr += cu->current_tb;
		}
	}
	return sum_purr;
}

#ifdef CONFIG_PPC_ISERIES

/*
 * Methods used to fetch LPAR data when running on an iSeries platform.
 */
static int iseries_lparcfg_data(struct seq_file *m, void *v)
{
	unsigned long pool_id;
	int shared, entitled_capacity, max_entitled_capacity;
	int processors, max_processors;
	unsigned long purr = get_purr();

	shared = (int)(local_paca->lppaca_ptr->shared_proc);

	seq_printf(m, "system_active_processors=%d\n",
		   (int)HvLpConfig_getSystemPhysicalProcessors());

	seq_printf(m, "system_potential_processors=%d\n",
		   (int)HvLpConfig_getSystemPhysicalProcessors());

	processors = (int)HvLpConfig_getPhysicalProcessors();
	seq_printf(m, "partition_active_processors=%d\n", processors);

	max_processors = (int)HvLpConfig_getMaxPhysicalProcessors();
	seq_printf(m, "partition_potential_processors=%d\n", max_processors);

	if (shared) {
		entitled_capacity = HvLpConfig_getSharedProcUnits();
		max_entitled_capacity = HvLpConfig_getMaxSharedProcUnits();
	} else {
		entitled_capacity = processors * 100;
		max_entitled_capacity = max_processors * 100;
	}
	seq_printf(m, "partition_entitled_capacity=%d\n", entitled_capacity);

	seq_printf(m, "partition_max_entitled_capacity=%d\n",
		   max_entitled_capacity);

	if (shared) {
		pool_id = HvLpConfig_getSharedPoolIndex();
		seq_printf(m, "pool=%d\n", (int)pool_id);
		seq_printf(m, "pool_capacity=%d\n",
			   (int)(HvLpConfig_getNumProcsInSharedPool(pool_id) *
				 100));
		seq_printf(m, "purr=%ld\n", purr);
	}

	seq_printf(m, "shared_processor_mode=%d\n", shared);

	return 0;
}

#else				/* CONFIG_PPC_ISERIES */

static int iseries_lparcfg_data(struct seq_file *m, void *v)
{
	return 0;
}

#endif				/* CONFIG_PPC_ISERIES */

#ifdef CONFIG_PPC_PSERIES
/*
 * Methods used to fetch LPAR data when running on a pSeries platform.
 */
static void log_plpar_hcall_return(unsigned long rc, char *tag)
{
	switch(rc) {
	case 0:
		return;
	case H_HARDWARE:
		printk(KERN_INFO "plpar-hcall (%s) "
				"Hardware fault\n", tag);
		return;
	case H_FUNCTION:
		printk(KERN_INFO "plpar-hcall (%s) "
				"Function not allowed\n", tag);
		return;
	case H_AUTHORITY:
		printk(KERN_INFO "plpar-hcall (%s) "
				"Not authorized to this function\n", tag);
		return;
	case H_PARAMETER:
		printk(KERN_INFO "plpar-hcall (%s) "
				"Bad parameter(s)\n",tag);
		return;
	default:
		printk(KERN_INFO "plpar-hcall (%s) "
				"Unexpected rc(0x%lx)\n", tag, rc);
	}
}

/*
 * H_GET_PPP hcall returns info in 4 parms.
 *  entitled_capacity,unallocated_capacity,
 *  aggregation, resource_capability).
 *
 *  R4 = Entitled Processor Capacity Percentage.
 *  R5 = Unallocated Processor Capacity Percentage.
 *  R6 (AABBCCDDEEFFGGHH).
 *      XXXX - reserved (0)
 *          XXXX - reserved (0)
 *              XXXX - Group Number
 *                  XXXX - Pool Number.
 *  R7 (IIJJKKLLMMNNOOPP).
 *      XX - reserved. (0)
 *        XX - bit 0-6 reserved (0).   bit 7 is Capped indicator.
 *          XX - variable processor Capacity Weight
 *            XX - Unallocated Variable Processor Capacity Weight.
 *              XXXX - Active processors in Physical Processor Pool.
 *                  XXXX  - Processors active on platform.
 */
static unsigned int h_get_ppp(unsigned long *entitled,
			      unsigned long *unallocated,
			      unsigned long *aggregation,
			      unsigned long *resource)
{
	unsigned long rc;
	unsigned long retbuf[PLPAR_HCALL_BUFSIZE];

	rc = plpar_hcall(H_GET_PPP, retbuf);

	*entitled = retbuf[0];
	*unallocated = retbuf[1];
	*aggregation = retbuf[2];
	*resource = retbuf[3];

	log_plpar_hcall_return(rc, "H_GET_PPP");

	return rc;
}

static void h_pic(unsigned long *pool_idle_time, unsigned long *num_procs)
{
	unsigned long rc;
	unsigned long retbuf[PLPAR_HCALL_BUFSIZE];

	rc = plpar_hcall(H_PIC, retbuf);

	*pool_idle_time = retbuf[0];
	*num_procs = retbuf[1];

	if (rc != H_AUTHORITY)
		log_plpar_hcall_return(rc, "H_PIC");
}

#define SPLPAR_CHARACTERISTICS_TOKEN 20
#define SPLPAR_MAXLENGTH 1026*(sizeof(char))

/*
 * parse_system_parameter_string()
 * Retrieve the potential_processors, max_entitled_capacity and friends
 * through the get-system-parameter rtas call.  Replace keyword strings as
 * necessary.
 */
static void parse_system_parameter_string(struct seq_file *m)
{
	int call_status;

	unsigned char *local_buffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
	if (!local_buffer) {
		printk(KERN_ERR "%s %s kmalloc failure at line %d \n",
		       __FILE__, __func__, __LINE__);
		return;
	}

	spin_lock(&rtas_data_buf_lock);
	memset(rtas_data_buf, 0, SPLPAR_MAXLENGTH);
	call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
				NULL,
				SPLPAR_CHARACTERISTICS_TOKEN,
				__pa(rtas_data_buf),
				RTAS_DATA_BUF_SIZE);
	memcpy(local_buffer, rtas_data_buf, SPLPAR_MAXLENGTH);
	spin_unlock(&rtas_data_buf_lock);

	if (call_status != 0) {
		printk(KERN_INFO
		       "%s %s Error calling get-system-parameter (0x%x)\n",
		       __FILE__, __func__, call_status);
	} else {
		int splpar_strlen;
		int idx, w_idx;
		char *workbuffer = kzalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
		if (!workbuffer) {
			printk(KERN_ERR "%s %s kmalloc failure at line %d \n",
			       __FILE__, __func__, __LINE__);
			kfree(local_buffer);
			return;
		}
#ifdef LPARCFG_DEBUG
		printk(KERN_INFO "success calling get-system-parameter \n");
#endif
		splpar_strlen = local_buffer[0] * 256 + local_buffer[1];
		local_buffer += 2;	/* step over strlen value */

		w_idx = 0;
		idx = 0;
		while ((*local_buffer) && (idx < splpar_strlen)) {
			workbuffer[w_idx++] = local_buffer[idx++];
			if ((local_buffer[idx] == ',')
			    || (local_buffer[idx] == '\0')) {
				workbuffer[w_idx] = '\0';
				if (w_idx) {
					/* avoid the empty string */
					seq_printf(m, "%s\n", workbuffer);
				}
				memset(workbuffer, 0, SPLPAR_MAXLENGTH);
				idx++;	/* skip the comma */
				w_idx = 0;
			} else if (local_buffer[idx] == '=') {
				/* code here to replace workbuffer contents
				   with different keyword strings */
				if (0 == strcmp(workbuffer, "MaxEntCap")) {
					strcpy(workbuffer,
					       "partition_max_entitled_capacity");
					w_idx = strlen(workbuffer);
				}
				if (0 == strcmp(workbuffer, "MaxPlatProcs")) {
					strcpy(workbuffer,
					       "system_potential_processors");
					w_idx = strlen(workbuffer);
				}
			}
		}
		kfree(workbuffer);
		local_buffer -= 2;	/* back up over strlen value */
	}
	kfree(local_buffer);
}

/* Return the number of processors in the system.
 * This function reads through the device tree and counts
 * the virtual processors, this does not include threads.
 */
static int lparcfg_count_active_processors(void)
{
	struct device_node *cpus_dn = NULL;
	int count = 0;

	while ((cpus_dn = of_find_node_by_type(cpus_dn, "cpu"))) {
#ifdef LPARCFG_DEBUG
		printk(KERN_ERR "cpus_dn %p \n", cpus_dn);
#endif
		count++;
	}
	return count;
}

static int pseries_lparcfg_data(struct seq_file *m, void *v)
{
	int partition_potential_processors;
	int partition_active_processors;
	struct device_node *rtas_node;
	const int *lrdrp = NULL;

	rtas_node = of_find_node_by_path("/rtas");
	if (rtas_node)
		lrdrp = of_get_property(rtas_node, "ibm,lrdr-capacity", NULL);

	if (lrdrp == NULL) {
		partition_potential_processors = vdso_data->processorCount;
	} else {
		partition_potential_processors = *(lrdrp + 4);
	}
	of_node_put(rtas_node);

	partition_active_processors = lparcfg_count_active_processors();

	if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
		unsigned long h_entitled, h_unallocated;
		unsigned long h_aggregation, h_resource;
		unsigned long pool_idle_time, pool_procs;
		unsigned long purr;

		h_get_ppp(&h_entitled, &h_unallocated, &h_aggregation,
			  &h_resource);

		seq_printf(m, "R4=0x%lx\n", h_entitled);
		seq_printf(m, "R5=0x%lx\n", h_unallocated);
		seq_printf(m, "R6=0x%lx\n", h_aggregation);
		seq_printf(m, "R7=0x%lx\n", h_resource);

		purr = get_purr();

		/* this call handles the ibm,get-system-parameter contents */
		parse_system_parameter_string(m);

		seq_printf(m, "partition_entitled_capacity=%ld\n", h_entitled);

		seq_printf(m, "group=%ld\n", (h_aggregation >> 2 * 8) & 0xffff);

		seq_printf(m, "system_active_processors=%ld\n",
			   (h_resource >> 0 * 8) & 0xffff);

		/* pool related entries are apropriate for shared configs */
		if (lppaca[0].shared_proc) {

			h_pic(&pool_idle_time, &pool_procs);

			seq_printf(m, "pool=%ld\n",
				   (h_aggregation >> 0 * 8) & 0xffff);

			/* report pool_capacity in percentage */
			seq_printf(m, "pool_capacity=%ld\n",
				   ((h_resource >> 2 * 8) & 0xffff) * 100);

			seq_printf(m, "pool_idle_time=%ld\n", pool_idle_time);

			seq_printf(m, "pool_num_procs=%ld\n", pool_procs);
		}

		seq_printf(m, "unallocated_capacity_weight=%ld\n",
			   (h_resource >> 4 * 8) & 0xFF);

		seq_printf(m, "capacity_weight=%ld\n",
			   (h_resource >> 5 * 8) & 0xFF);

		seq_printf(m, "capped=%ld\n", (h_resource >> 6 * 8) & 0x01);

		seq_printf(m, "unallocated_capacity=%ld\n", h_unallocated);

		seq_printf(m, "purr=%ld\n", purr);

	} else {		/* non SPLPAR case */

		seq_printf(m, "system_active_processors=%d\n",
			   partition_potential_processors);

		seq_printf(m, "system_potential_processors=%d\n",
			   partition_potential_processors);

		seq_printf(m, "partition_max_entitled_capacity=%d\n",
			   partition_potential_processors * 100);

		seq_printf(m, "partition_entitled_capacity=%d\n",
			   partition_active_processors * 100);
	}

	seq_printf(m, "partition_active_processors=%d\n",
		   partition_active_processors);

	seq_printf(m, "partition_potential_processors=%d\n",
		   partition_potential_processors);

	seq_printf(m, "shared_processor_mode=%d\n", lppaca[0].shared_proc);

	return 0;
}

/*
 * Interface for changing system parameters (variable capacity weight
 * and entitled capacity).  Format of input is "param_name=value";
 * anything after value is ignored.  Valid parameters at this time are
 * "partition_entitled_capacity" and "capacity_weight".  We use
 * H_SET_PPP to alter parameters.
 *
 * This function should be invoked only on systems with
 * FW_FEATURE_SPLPAR.
 */
static ssize_t lparcfg_write(struct file *file, const char __user * buf,
			     size_t count, loff_t * off)
{
	char *kbuf;
	char *tmp;
	u64 new_entitled, *new_entitled_ptr = &new_entitled;
	u8 new_weight, *new_weight_ptr = &new_weight;

	unsigned long current_entitled;	/* parameters for h_get_ppp */
	unsigned long dummy;
	unsigned long resource;
	u8 current_weight;

	ssize_t retval = -ENOMEM;

	if (!firmware_has_feature(FW_FEATURE_SPLPAR) ||
			firmware_has_feature(FW_FEATURE_ISERIES))
		return -EINVAL;

	kbuf = kmalloc(count, GFP_KERNEL);
	if (!kbuf)
		goto out;

	retval = -EFAULT;
	if (copy_from_user(kbuf, buf, count))
		goto out;

	retval = -EINVAL;
	kbuf[count - 1] = '\0';
	tmp = strchr(kbuf, '=');
	if (!tmp)
		goto out;

	*tmp++ = '\0';

	if (!strcmp(kbuf, "partition_entitled_capacity")) {
		char *endp;
		*new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
		if (endp == tmp)
			goto out;
		new_weight_ptr = &current_weight;
	} else if (!strcmp(kbuf, "capacity_weight")) {
		char *endp;
		*new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
		if (endp == tmp)
			goto out;
		new_entitled_ptr = &current_entitled;
	} else
		goto out;

	/* Get our current parameters */
	retval = h_get_ppp(&current_entitled, &dummy, &dummy, &resource);
	if (retval) {
		retval = -EIO;
		goto out;
	}

	current_weight = (resource >> 5 * 8) & 0xFF;

	pr_debug("%s: current_entitled = %lu, current_weight = %u\n",
		 __func__, current_entitled, current_weight);

	pr_debug("%s: new_entitled = %lu, new_weight = %u\n",
		 __func__, *new_entitled_ptr, *new_weight_ptr);

	retval = plpar_hcall_norets(H_SET_PPP, *new_entitled_ptr,
				    *new_weight_ptr);

	if (retval == H_SUCCESS || retval == H_CONSTRAINED) {
		retval = count;
	} else if (retval == H_BUSY) {
		retval = -EBUSY;
	} else if (retval == H_HARDWARE) {
		retval = -EIO;
	} else if (retval == H_PARAMETER) {
		retval = -EINVAL;
	} else {
		printk(KERN_WARNING "%s: received unknown hv return code %ld",
		       __func__, retval);
		retval = -EIO;
	}

out:
	kfree(kbuf);
	return retval;
}

#else				/* CONFIG_PPC_PSERIES */

static int pseries_lparcfg_data(struct seq_file *m, void *v)
{
	return 0;
}

static ssize_t lparcfg_write(struct file *file, const char __user * buf,
			     size_t count, loff_t * off)
{
	return -EINVAL;
}

#endif				/* CONFIG_PPC_PSERIES */

static int lparcfg_data(struct seq_file *m, void *v)
{
	struct device_node *rootdn;
	const char *model = "";
	const char *system_id = "";
	const char *tmp;
	const unsigned int *lp_index_ptr;
	unsigned int lp_index = 0;

	seq_printf(m, "%s %s \n", MODULE_NAME, MODULE_VERS);

	rootdn = of_find_node_by_path("/");
	if (rootdn) {
		tmp = of_get_property(rootdn, "model", NULL);
		if (tmp) {
			model = tmp;
			/* Skip "IBM," - see platforms/iseries/dt.c */
			if (firmware_has_feature(FW_FEATURE_ISERIES))
				model += 4;
		}
		tmp = of_get_property(rootdn, "system-id", NULL);
		if (tmp) {
			system_id = tmp;
			/* Skip "IBM," - see platforms/iseries/dt.c */
			if (firmware_has_feature(FW_FEATURE_ISERIES))
				system_id += 4;
		}
		lp_index_ptr = of_get_property(rootdn, "ibm,partition-no",
					NULL);
		if (lp_index_ptr)
			lp_index = *lp_index_ptr;
		of_node_put(rootdn);
	}
	seq_printf(m, "serial_number=%s\n", system_id);
	seq_printf(m, "system_type=%s\n", model);
	seq_printf(m, "partition_id=%d\n", (int)lp_index);

	if (firmware_has_feature(FW_FEATURE_ISERIES))
		return iseries_lparcfg_data(m, v);
	return pseries_lparcfg_data(m, v);
}

static int lparcfg_open(struct inode *inode, struct file *file)
{
	return single_open(file, lparcfg_data, NULL);
}

const struct file_operations lparcfg_fops = {
	.owner		= THIS_MODULE,
	.read		= seq_read,
	.write		= lparcfg_write,
	.open		= lparcfg_open,
	.release	= single_release,
};

int __init lparcfg_init(void)
{
	struct proc_dir_entry *ent;
	mode_t mode = S_IRUSR | S_IRGRP | S_IROTH;

	/* Allow writing if we have FW_FEATURE_SPLPAR */
	if (firmware_has_feature(FW_FEATURE_SPLPAR) &&
			!firmware_has_feature(FW_FEATURE_ISERIES))
		mode |= S_IWUSR;

	ent = proc_create("ppc64/lparcfg", mode, NULL, &lparcfg_fops);
	if (!ent) {
		printk(KERN_ERR "Failed to create ppc64/lparcfg\n");
		return -EIO;
	}

	proc_ppc64_lparcfg = ent;
	return 0;
}

void __exit lparcfg_cleanup(void)
{
	if (proc_ppc64_lparcfg)
		remove_proc_entry("lparcfg", proc_ppc64_lparcfg->parent);
}

module_init(lparcfg_init);
module_exit(lparcfg_cleanup);
MODULE_DESCRIPTION("Interface for LPAR configuration data");
MODULE_AUTHOR("Dave Engebretsen");
MODULE_LICENSE("GPL");