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[TG3]: Set minimal hw interrupt mitigation.
[linux-2.6/verdex.git] / arch / ppc64 / kernel / lparcfg.c
bloba8fd32df848b71ade564d51316ab93f35a4348c6
1 /*
2 * PowerPC64 LPAR Configuration Information Driver
3 *
4 * Dave Engebretsen engebret@us.ibm.com
5 * Copyright (c) 2003 Dave Engebretsen
6 * Will Schmidt willschm@us.ibm.com
7 * SPLPAR updates, Copyright (c) 2003 Will Schmidt IBM Corporation.
8 * seq_file updates, Copyright (c) 2004 Will Schmidt IBM Corporation.
9 * Nathan Lynch nathanl@austin.ibm.com
10 * Added lparcfg_write, Copyright (C) 2004 Nathan Lynch IBM Corporation.
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version
15 * 2 of the License, or (at your option) any later version.
16 *
17 * This driver creates a proc file at /proc/ppc64/lparcfg which contains
18 * keyword - value pairs that specify the configuration of the partition.
19 */
20
21 #include <linux/config.h>
22 #include <linux/module.h>
23 #include <linux/types.h>
24 #include <linux/errno.h>
25 #include <linux/proc_fs.h>
26 #include <linux/init.h>
27 #include <linux/seq_file.h>
28 #include <asm/uaccess.h>
29 #include <asm/iSeries/HvLpConfig.h>
30 #include <asm/lppaca.h>
31 #include <asm/iSeries/LparData.h>
32 #include <asm/hvcall.h>
33 #include <asm/cputable.h>
34 #include <asm/rtas.h>
35 #include <asm/system.h>
36 #include <asm/time.h>
37
38 #define MODULE_VERS "1.6"
39 #define MODULE_NAME "lparcfg"
40
41 /* #define LPARCFG_DEBUG */
42
43 /* find a better place for this function... */
44 void log_plpar_hcall_return(unsigned long rc, char *tag)
45 {
46 if (rc == 0) /* success, return */
47 return;
48 /* check for null tag ? */
49 if (rc == H_Hardware)
50 printk(KERN_INFO
51 "plpar-hcall (%s) failed with hardware fault\n", tag);
52 else if (rc == H_Function)
53 printk(KERN_INFO
54 "plpar-hcall (%s) failed; function not allowed\n", tag);
55 else if (rc == H_Authority)
56 printk(KERN_INFO
57 "plpar-hcall (%s) failed; not authorized to this function\n",
58 tag);
59 else if (rc == H_Parameter)
60 printk(KERN_INFO "plpar-hcall (%s) failed; Bad parameter(s)\n",
61 tag);
62 else
63 printk(KERN_INFO
64 "plpar-hcall (%s) failed with unexpected rc(0x%lx)\n",
65 tag, rc);
66
67 }
68
69 static struct proc_dir_entry *proc_ppc64_lparcfg;
70 #define LPARCFG_BUFF_SIZE 4096
71
72 #ifdef CONFIG_PPC_ISERIES
73
74 /*
75 * For iSeries legacy systems, the PPA purr function is available from the
76 * emulated_time_base field in the paca.
77 */
78 static unsigned long get_purr(void)
79 {
80 unsigned long sum_purr = 0;
81 int cpu;
82 struct paca_struct *lpaca;
83
84 for_each_cpu(cpu) {
85 lpaca = paca + cpu;
86 sum_purr += lpaca->lppaca.emulated_time_base;
87
88 #ifdef PURR_DEBUG
89 printk(KERN_INFO "get_purr for cpu (%d) has value (%ld) \n",
90 cpu, lpaca->lppaca.emulated_time_base);
91 #endif
92 }
93 return sum_purr;
94 }
95
96 #define lparcfg_write NULL
97
98 /*
99 * Methods used to fetch LPAR data when running on an iSeries platform.
100 */
101 static int lparcfg_data(struct seq_file *m, void *v)
102 {
103 unsigned long pool_id, lp_index;
104 int shared, entitled_capacity, max_entitled_capacity;
105 int processors, max_processors;
106 struct paca_struct *lpaca = get_paca();
107 unsigned long purr = get_purr();
108
109 seq_printf(m, "%s %s \n", MODULE_NAME, MODULE_VERS);
110
111 shared = (int)(lpaca->lppaca_ptr->shared_proc);
112 seq_printf(m, "serial_number=%c%c%c%c%c%c%c\n",
113 e2a(xItExtVpdPanel.mfgID[2]),
114 e2a(xItExtVpdPanel.mfgID[3]),
115 e2a(xItExtVpdPanel.systemSerial[1]),
116 e2a(xItExtVpdPanel.systemSerial[2]),
117 e2a(xItExtVpdPanel.systemSerial[3]),
118 e2a(xItExtVpdPanel.systemSerial[4]),
119 e2a(xItExtVpdPanel.systemSerial[5]));
120
121 seq_printf(m, "system_type=%c%c%c%c\n",
122 e2a(xItExtVpdPanel.machineType[0]),
123 e2a(xItExtVpdPanel.machineType[1]),
124 e2a(xItExtVpdPanel.machineType[2]),
125 e2a(xItExtVpdPanel.machineType[3]));
126
127 lp_index = HvLpConfig_getLpIndex();
128 seq_printf(m, "partition_id=%d\n", (int)lp_index);
129
130 seq_printf(m, "system_active_processors=%d\n",
131 (int)HvLpConfig_getSystemPhysicalProcessors());
132
133 seq_printf(m, "system_potential_processors=%d\n",
134 (int)HvLpConfig_getSystemPhysicalProcessors());
135
136 processors = (int)HvLpConfig_getPhysicalProcessors();
137 seq_printf(m, "partition_active_processors=%d\n", processors);
138
139 max_processors = (int)HvLpConfig_getMaxPhysicalProcessors();
140 seq_printf(m, "partition_potential_processors=%d\n", max_processors);
141
142 if (shared) {
143 entitled_capacity = HvLpConfig_getSharedProcUnits();
144 max_entitled_capacity = HvLpConfig_getMaxSharedProcUnits();
145 } else {
146 entitled_capacity = processors * 100;
147 max_entitled_capacity = max_processors * 100;
148 }
149 seq_printf(m, "partition_entitled_capacity=%d\n", entitled_capacity);
150
151 seq_printf(m, "partition_max_entitled_capacity=%d\n",
152 max_entitled_capacity);
153
154 if (shared) {
155 pool_id = HvLpConfig_getSharedPoolIndex();
156 seq_printf(m, "pool=%d\n", (int)pool_id);
157 seq_printf(m, "pool_capacity=%d\n",
158 (int)(HvLpConfig_getNumProcsInSharedPool(pool_id) *
159 100));
160 seq_printf(m, "purr=%ld\n", purr);
161 }
162
163 seq_printf(m, "shared_processor_mode=%d\n", shared);
164
165 return 0;
166 }
167 #endif /* CONFIG_PPC_ISERIES */
168
169 #ifdef CONFIG_PPC_PSERIES
170 /*
171 * Methods used to fetch LPAR data when running on a pSeries platform.
172 */
173
174 /*
175 * H_GET_PPP hcall returns info in 4 parms.
176 * entitled_capacity,unallocated_capacity,
177 * aggregation, resource_capability).
178 *
179 * R4 = Entitled Processor Capacity Percentage.
180 * R5 = Unallocated Processor Capacity Percentage.
181 * R6 (AABBCCDDEEFFGGHH).
182 * XXXX - reserved (0)
183 * XXXX - reserved (0)
184 * XXXX - Group Number
185 * XXXX - Pool Number.
186 * R7 (IIJJKKLLMMNNOOPP).
187 * XX - reserved. (0)
188 * XX - bit 0-6 reserved (0). bit 7 is Capped indicator.
189 * XX - variable processor Capacity Weight
190 * XX - Unallocated Variable Processor Capacity Weight.
191 * XXXX - Active processors in Physical Processor Pool.
192 * XXXX - Processors active on platform.
193 */
194 static unsigned int h_get_ppp(unsigned long *entitled,
195 unsigned long *unallocated,
196 unsigned long *aggregation,
197 unsigned long *resource)
198 {
199 unsigned long rc;
200 rc = plpar_hcall_4out(H_GET_PPP, 0, 0, 0, 0, entitled, unallocated,
201 aggregation, resource);
202
203 log_plpar_hcall_return(rc, "H_GET_PPP");
204
205 return rc;
206 }
207
208 static void h_pic(unsigned long *pool_idle_time, unsigned long *num_procs)
209 {
210 unsigned long rc;
211 unsigned long dummy;
212 rc = plpar_hcall(H_PIC, 0, 0, 0, 0, pool_idle_time, num_procs, &dummy);
213
214 log_plpar_hcall_return(rc, "H_PIC");
215 }
216
217 static unsigned long get_purr(void);
218
219 /* Track sum of all purrs across all processors. This is used to further */
220 /* calculate usage values by different applications */
221
222 static unsigned long get_purr(void)
223 {
224 unsigned long sum_purr = 0;
225 int cpu;
226 struct cpu_usage *cu;
227
228 for_each_cpu(cpu) {
229 cu = &per_cpu(cpu_usage_array, cpu);
230 sum_purr += cu->current_tb;
231 }
232 return sum_purr;
233 }
234
235 #define SPLPAR_CHARACTERISTICS_TOKEN 20
236 #define SPLPAR_MAXLENGTH 1026*(sizeof(char))
237
238 /*
239 * parse_system_parameter_string()
240 * Retrieve the potential_processors, max_entitled_capacity and friends
241 * through the get-system-parameter rtas call. Replace keyword strings as
242 * necessary.
243 */
244 static void parse_system_parameter_string(struct seq_file *m)
245 {
246 int call_status;
247
248 char *local_buffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
249 if (!local_buffer) {
250 printk(KERN_ERR "%s %s kmalloc failure at line %d \n",
251 __FILE__, __FUNCTION__, __LINE__);
252 return;
253 }
254
255 spin_lock(&rtas_data_buf_lock);
256 memset(rtas_data_buf, 0, SPLPAR_MAXLENGTH);
257 call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
258 NULL,
259 SPLPAR_CHARACTERISTICS_TOKEN,
260 __pa(rtas_data_buf));
261 memcpy(local_buffer, rtas_data_buf, SPLPAR_MAXLENGTH);
262 spin_unlock(&rtas_data_buf_lock);
263
264 if (call_status != 0) {
265 printk(KERN_INFO
266 "%s %s Error calling get-system-parameter (0x%x)\n",
267 __FILE__, __FUNCTION__, call_status);
268 } else {
269 int splpar_strlen;
270 int idx, w_idx;
271 char *workbuffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
272 if (!workbuffer) {
273 printk(KERN_ERR "%s %s kmalloc failure at line %d \n",
274 __FILE__, __FUNCTION__, __LINE__);
275 return;
276 }
277 #ifdef LPARCFG_DEBUG
278 printk(KERN_INFO "success calling get-system-parameter \n");
279 #endif
280 splpar_strlen = local_buffer[0] * 16 + local_buffer[1];
281 local_buffer += 2; /* step over strlen value */
282
283 memset(workbuffer, 0, SPLPAR_MAXLENGTH);
284 w_idx = 0;
285 idx = 0;
286 while ((*local_buffer) && (idx < splpar_strlen)) {
287 workbuffer[w_idx++] = local_buffer[idx++];
288 if ((local_buffer[idx] == ',')
289 || (local_buffer[idx] == '\0')) {
290 workbuffer[w_idx] = '\0';
291 if (w_idx) {
292 /* avoid the empty string */
293 seq_printf(m, "%s\n", workbuffer);
294 }
295 memset(workbuffer, 0, SPLPAR_MAXLENGTH);
296 idx++; /* skip the comma */
297 w_idx = 0;
298 } else if (local_buffer[idx] == '=') {
299 /* code here to replace workbuffer contents
300 with different keyword strings */
301 if (0 == strcmp(workbuffer, "MaxEntCap")) {
302 strcpy(workbuffer,
303 "partition_max_entitled_capacity");
304 w_idx = strlen(workbuffer);
305 }
306 if (0 == strcmp(workbuffer, "MaxPlatProcs")) {
307 strcpy(workbuffer,
308 "system_potential_processors");
309 w_idx = strlen(workbuffer);
310 }
311 }
312 }
313 kfree(workbuffer);
314 local_buffer -= 2; /* back up over strlen value */
315 }
316 kfree(local_buffer);
317 }
318
319 static int lparcfg_count_active_processors(void);
320
321 /* Return the number of processors in the system.
322 * This function reads through the device tree and counts
323 * the virtual processors, this does not include threads.
324 */
325 static int lparcfg_count_active_processors(void)
326 {
327 struct device_node *cpus_dn = NULL;
328 int count = 0;
329
330 while ((cpus_dn = of_find_node_by_type(cpus_dn, "cpu"))) {
331 #ifdef LPARCFG_DEBUG
332 printk(KERN_ERR "cpus_dn %p \n", cpus_dn);
333 #endif
334 count++;
335 }
336 return count;
337 }
338
339 static int lparcfg_data(struct seq_file *m, void *v)
340 {
341 int partition_potential_processors;
342 int partition_active_processors;
343 struct device_node *rootdn;
344 const char *model = "";
345 const char *system_id = "";
346 unsigned int *lp_index_ptr, lp_index = 0;
347 struct device_node *rtas_node;
348 int *lrdrp;
349
350 rootdn = find_path_device("/");
351 if (rootdn) {
352 model = get_property(rootdn, "model", NULL);
353 system_id = get_property(rootdn, "system-id", NULL);
354 lp_index_ptr = (unsigned int *)
355 get_property(rootdn, "ibm,partition-no", NULL);
356 if (lp_index_ptr)
357 lp_index = *lp_index_ptr;
358 }
359
360 seq_printf(m, "%s %s \n", MODULE_NAME, MODULE_VERS);
361
362 seq_printf(m, "serial_number=%s\n", system_id);
363
364 seq_printf(m, "system_type=%s\n", model);
365
366 seq_printf(m, "partition_id=%d\n", (int)lp_index);
367
368 rtas_node = find_path_device("/rtas");
369 lrdrp = (int *)get_property(rtas_node, "ibm,lrdr-capacity", NULL);
370
371 if (lrdrp == NULL) {
372 partition_potential_processors = systemcfg->processorCount;
373 } else {
374 partition_potential_processors = *(lrdrp + 4);
375 }
376
377 partition_active_processors = lparcfg_count_active_processors();
378
379 if (cur_cpu_spec->firmware_features & FW_FEATURE_SPLPAR) {
380 unsigned long h_entitled, h_unallocated;
381 unsigned long h_aggregation, h_resource;
382 unsigned long pool_idle_time, pool_procs;
383 unsigned long purr;
384
385 h_get_ppp(&h_entitled, &h_unallocated, &h_aggregation,
386 &h_resource);
387
388 seq_printf(m, "R4=0x%lx\n", h_entitled);
389 seq_printf(m, "R5=0x%lx\n", h_unallocated);
390 seq_printf(m, "R6=0x%lx\n", h_aggregation);
391 seq_printf(m, "R7=0x%lx\n", h_resource);
392
393 purr = get_purr();
394
395 /* this call handles the ibm,get-system-parameter contents */
396 parse_system_parameter_string(m);
397
398 seq_printf(m, "partition_entitled_capacity=%ld\n", h_entitled);
399
400 seq_printf(m, "group=%ld\n", (h_aggregation >> 2 * 8) & 0xffff);
401
402 seq_printf(m, "system_active_processors=%ld\n",
403 (h_resource >> 0 * 8) & 0xffff);
404
405 /* pool related entries are apropriate for shared configs */
406 if (paca[0].lppaca.shared_proc) {
407
408 h_pic(&pool_idle_time, &pool_procs);
409
410 seq_printf(m, "pool=%ld\n",
411 (h_aggregation >> 0 * 8) & 0xffff);
412
413 /* report pool_capacity in percentage */
414 seq_printf(m, "pool_capacity=%ld\n",
415 ((h_resource >> 2 * 8) & 0xffff) * 100);
416
417 seq_printf(m, "pool_idle_time=%ld\n", pool_idle_time);
418
419 seq_printf(m, "pool_num_procs=%ld\n", pool_procs);
420 }
421
422 seq_printf(m, "unallocated_capacity_weight=%ld\n",
423 (h_resource >> 4 * 8) & 0xFF);
424
425 seq_printf(m, "capacity_weight=%ld\n",
426 (h_resource >> 5 * 8) & 0xFF);
427
428 seq_printf(m, "capped=%ld\n", (h_resource >> 6 * 8) & 0x01);
429
430 seq_printf(m, "unallocated_capacity=%ld\n", h_unallocated);
431
432 seq_printf(m, "purr=%ld\n", purr);
433
434 } else { /* non SPLPAR case */
435
436 seq_printf(m, "system_active_processors=%d\n",
437 partition_potential_processors);
438
439 seq_printf(m, "system_potential_processors=%d\n",
440 partition_potential_processors);
441
442 seq_printf(m, "partition_max_entitled_capacity=%d\n",
443 partition_potential_processors * 100);
444
445 seq_printf(m, "partition_entitled_capacity=%d\n",
446 partition_active_processors * 100);
447 }
448
449 seq_printf(m, "partition_active_processors=%d\n",
450 partition_active_processors);
451
452 seq_printf(m, "partition_potential_processors=%d\n",
453 partition_potential_processors);
454
455 seq_printf(m, "shared_processor_mode=%d\n", paca[0].lppaca.shared_proc);
456
457 return 0;
458 }
459
460 /*
461 * Interface for changing system parameters (variable capacity weight
462 * and entitled capacity). Format of input is "param_name=value";
463 * anything after value is ignored. Valid parameters at this time are
464 * "partition_entitled_capacity" and "capacity_weight". We use
465 * H_SET_PPP to alter parameters.
466 *
467 * This function should be invoked only on systems with
468 * FW_FEATURE_SPLPAR.
469 */
470 static ssize_t lparcfg_write(struct file *file, const char __user * buf,
471 size_t count, loff_t * off)
472 {
473 char *kbuf;
474 char *tmp;
475 u64 new_entitled, *new_entitled_ptr = &new_entitled;
476 u8 new_weight, *new_weight_ptr = &new_weight;
477
478 unsigned long current_entitled; /* parameters for h_get_ppp */
479 unsigned long dummy;
480 unsigned long resource;
481 u8 current_weight;
482
483 ssize_t retval = -ENOMEM;
484
485 kbuf = kmalloc(count, GFP_KERNEL);
486 if (!kbuf)
487 goto out;
488
489 retval = -EFAULT;
490 if (copy_from_user(kbuf, buf, count))
491 goto out;
492
493 retval = -EINVAL;
494 kbuf[count - 1] = '\0';
495 tmp = strchr(kbuf, '=');
496 if (!tmp)
497 goto out;
498
499 *tmp++ = '\0';
500
501 if (!strcmp(kbuf, "partition_entitled_capacity")) {
502 char *endp;
503 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
504 if (endp == tmp)
505 goto out;
506 new_weight_ptr = &current_weight;
507 } else if (!strcmp(kbuf, "capacity_weight")) {
508 char *endp;
509 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
510 if (endp == tmp)
511 goto out;
512 new_entitled_ptr = &current_entitled;
513 } else
514 goto out;
515
516 /* Get our current parameters */
517 retval = h_get_ppp(&current_entitled, &dummy, &dummy, &resource);
518 if (retval) {
519 retval = -EIO;
520 goto out;
521 }
522
523 current_weight = (resource >> 5 * 8) & 0xFF;
524
525 pr_debug("%s: current_entitled = %lu, current_weight = %lu\n",
526 __FUNCTION__, current_entitled, current_weight);
527
528 pr_debug("%s: new_entitled = %lu, new_weight = %lu\n",
529 __FUNCTION__, *new_entitled_ptr, *new_weight_ptr);
530
531 retval = plpar_hcall_norets(H_SET_PPP, *new_entitled_ptr,
532 *new_weight_ptr);
533
534 if (retval == H_Success || retval == H_Constrained) {
535 retval = count;
536 } else if (retval == H_Busy) {
537 retval = -EBUSY;
538 } else if (retval == H_Hardware) {
539 retval = -EIO;
540 } else if (retval == H_Parameter) {
541 retval = -EINVAL;
542 } else {
543 printk(KERN_WARNING "%s: received unknown hv return code %ld",
544 __FUNCTION__, retval);
545 retval = -EIO;
546 }
547
548 out:
549 kfree(kbuf);
550 return retval;
551 }
552
553 #endif /* CONFIG_PPC_PSERIES */
554
555 static int lparcfg_open(struct inode *inode, struct file *file)
556 {
557 return single_open(file, lparcfg_data, NULL);
558 }
559
560 struct file_operations lparcfg_fops = {
561 .owner = THIS_MODULE,
562 .read = seq_read,
563 .open = lparcfg_open,
564 .release = single_release,
565 };
566
567 int __init lparcfg_init(void)
568 {
569 struct proc_dir_entry *ent;
570 mode_t mode = S_IRUSR;
571
572 /* Allow writing if we have FW_FEATURE_SPLPAR */
573 if (cur_cpu_spec->firmware_features & FW_FEATURE_SPLPAR) {
574 lparcfg_fops.write = lparcfg_write;
575 mode |= S_IWUSR;
576 }
577
578 ent = create_proc_entry("ppc64/lparcfg", mode, NULL);
579 if (ent) {
580 ent->proc_fops = &lparcfg_fops;
581 ent->data = kmalloc(LPARCFG_BUFF_SIZE, GFP_KERNEL);
582 if (!ent->data) {
583 printk(KERN_ERR
584 "Failed to allocate buffer for lparcfg\n");
585 remove_proc_entry("lparcfg", ent->parent);
586 return -ENOMEM;
587 }
588 } else {
589 printk(KERN_ERR "Failed to create ppc64/lparcfg\n");
590 return -EIO;
591 }
592
593 proc_ppc64_lparcfg = ent;
594 return 0;
595 }
596
597 void __exit lparcfg_cleanup(void)
598 {
599 if (proc_ppc64_lparcfg) {
600 if (proc_ppc64_lparcfg->data) {
601 kfree(proc_ppc64_lparcfg->data);
602 }
603 remove_proc_entry("lparcfg", proc_ppc64_lparcfg->parent);
604 }
605 }
606
607 module_init(lparcfg_init);
608 module_exit(lparcfg_cleanup);
609 MODULE_DESCRIPTION("Interface for LPAR configuration data");
610 MODULE_AUTHOR("Dave Engebretsen");
611 MODULE_LICENSE("GPL");
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