e789fef4eb8a1dc8f3dd210d884f98787fb7a211
[linux-2.6.git] / arch / powerpc / kernel / lparcfg.c
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/hv_lp_config.h>
30 #include <asm/lppaca.h>
31 #include <asm/hvcall.h>
32 #include <asm/firmware.h>
33 #include <asm/rtas.h>
34 #include <asm/system.h>
35 #include <asm/time.h>
36 #include <asm/iseries/it_exp_vpd_panel.h>
37 #include <asm/prom.h>
38 #include <asm/vdso_datapage.h>
39
40 #define MODULE_VERS "1.6"
41 #define MODULE_NAME "lparcfg"
42
43 /* #define LPARCFG_DEBUG */
44
45 static struct proc_dir_entry *proc_ppc64_lparcfg;
46 #define LPARCFG_BUFF_SIZE 4096
47
48 #ifdef CONFIG_PPC_ISERIES
49
50 /*
51  * For iSeries legacy systems, the PPA purr function is available from the
52  * emulated_time_base field in the paca.
53  */
54 static unsigned long get_purr(void)
55 {
56         unsigned long sum_purr = 0;
57         int cpu;
58
59         for_each_cpu(cpu) {
60                 sum_purr += lppaca[cpu].emulated_time_base;
61
62 #ifdef PURR_DEBUG
63                 printk(KERN_INFO "get_purr for cpu (%d) has value (%ld) \n",
64                         cpu, lppaca[cpu].emulated_time_base);
65 #endif
66         }
67         return sum_purr;
68 }
69
70 #define lparcfg_write NULL
71
72 /*
73  * Methods used to fetch LPAR data when running on an iSeries platform.
74  */
75 static int lparcfg_data(struct seq_file *m, void *v)
76 {
77         unsigned long pool_id, lp_index;
78         int shared, entitled_capacity, max_entitled_capacity;
79         int processors, max_processors;
80         unsigned long purr = get_purr();
81
82         seq_printf(m, "%s %s \n", MODULE_NAME, MODULE_VERS);
83
84         shared = (int)(get_lppaca()->shared_proc);
85         seq_printf(m, "serial_number=%c%c%c%c%c%c%c\n",
86                    e2a(xItExtVpdPanel.mfgID[2]),
87                    e2a(xItExtVpdPanel.mfgID[3]),
88                    e2a(xItExtVpdPanel.systemSerial[1]),
89                    e2a(xItExtVpdPanel.systemSerial[2]),
90                    e2a(xItExtVpdPanel.systemSerial[3]),
91                    e2a(xItExtVpdPanel.systemSerial[4]),
92                    e2a(xItExtVpdPanel.systemSerial[5]));
93
94         seq_printf(m, "system_type=%c%c%c%c\n",
95                    e2a(xItExtVpdPanel.machineType[0]),
96                    e2a(xItExtVpdPanel.machineType[1]),
97                    e2a(xItExtVpdPanel.machineType[2]),
98                    e2a(xItExtVpdPanel.machineType[3]));
99
100         lp_index = HvLpConfig_getLpIndex();
101         seq_printf(m, "partition_id=%d\n", (int)lp_index);
102
103         seq_printf(m, "system_active_processors=%d\n",
104                    (int)HvLpConfig_getSystemPhysicalProcessors());
105
106         seq_printf(m, "system_potential_processors=%d\n",
107                    (int)HvLpConfig_getSystemPhysicalProcessors());
108
109         processors = (int)HvLpConfig_getPhysicalProcessors();
110         seq_printf(m, "partition_active_processors=%d\n", processors);
111
112         max_processors = (int)HvLpConfig_getMaxPhysicalProcessors();
113         seq_printf(m, "partition_potential_processors=%d\n", max_processors);
114
115         if (shared) {
116                 entitled_capacity = HvLpConfig_getSharedProcUnits();
117                 max_entitled_capacity = HvLpConfig_getMaxSharedProcUnits();
118         } else {
119                 entitled_capacity = processors * 100;
120                 max_entitled_capacity = max_processors * 100;
121         }
122         seq_printf(m, "partition_entitled_capacity=%d\n", entitled_capacity);
123
124         seq_printf(m, "partition_max_entitled_capacity=%d\n",
125                    max_entitled_capacity);
126
127         if (shared) {
128                 pool_id = HvLpConfig_getSharedPoolIndex();
129                 seq_printf(m, "pool=%d\n", (int)pool_id);
130                 seq_printf(m, "pool_capacity=%d\n",
131                            (int)(HvLpConfig_getNumProcsInSharedPool(pool_id) *
132                                  100));
133                 seq_printf(m, "purr=%ld\n", purr);
134         }
135
136         seq_printf(m, "shared_processor_mode=%d\n", shared);
137
138         return 0;
139 }
140 #endif                          /* CONFIG_PPC_ISERIES */
141
142 #ifdef CONFIG_PPC_PSERIES
143 /*
144  * Methods used to fetch LPAR data when running on a pSeries platform.
145  */
146 /* find a better place for this function... */
147 static void log_plpar_hcall_return(unsigned long rc, char *tag)
148 {
149         if (rc == 0)            /* success, return */
150                 return;
151 /* check for null tag ? */
152         if (rc == H_Hardware)
153                 printk(KERN_INFO
154                        "plpar-hcall (%s) failed with hardware fault\n", tag);
155         else if (rc == H_Function)
156                 printk(KERN_INFO
157                        "plpar-hcall (%s) failed; function not allowed\n", tag);
158         else if (rc == H_Authority)
159                 printk(KERN_INFO
160                        "plpar-hcall (%s) failed; not authorized to this function\n",
161                        tag);
162         else if (rc == H_Parameter)
163                 printk(KERN_INFO "plpar-hcall (%s) failed; Bad parameter(s)\n",
164                        tag);
165         else
166                 printk(KERN_INFO
167                        "plpar-hcall (%s) failed with unexpected rc(0x%lx)\n",
168                        tag, rc);
169
170 }
171
172 /*
173  * H_GET_PPP hcall returns info in 4 parms.
174  *  entitled_capacity,unallocated_capacity,
175  *  aggregation, resource_capability).
176  *
177  *  R4 = Entitled Processor Capacity Percentage.
178  *  R5 = Unallocated Processor Capacity Percentage.
179  *  R6 (AABBCCDDEEFFGGHH).
180  *      XXXX - reserved (0)
181  *          XXXX - reserved (0)
182  *              XXXX - Group Number
183  *                  XXXX - Pool Number.
184  *  R7 (IIJJKKLLMMNNOOPP).
185  *      XX - reserved. (0)
186  *        XX - bit 0-6 reserved (0).   bit 7 is Capped indicator.
187  *          XX - variable processor Capacity Weight
188  *            XX - Unallocated Variable Processor Capacity Weight.
189  *              XXXX - Active processors in Physical Processor Pool.
190  *                  XXXX  - Processors active on platform.
191  */
192 static unsigned int h_get_ppp(unsigned long *entitled,
193                               unsigned long *unallocated,
194                               unsigned long *aggregation,
195                               unsigned long *resource)
196 {
197         unsigned long rc;
198         rc = plpar_hcall_4out(H_GET_PPP, 0, 0, 0, 0, entitled, unallocated,
199                               aggregation, resource);
200
201         log_plpar_hcall_return(rc, "H_GET_PPP");
202
203         return rc;
204 }
205
206 static void h_pic(unsigned long *pool_idle_time, unsigned long *num_procs)
207 {
208         unsigned long rc;
209         unsigned long dummy;
210         rc = plpar_hcall(H_PIC, 0, 0, 0, 0, pool_idle_time, num_procs, &dummy);
211
212         if (rc != H_Authority)
213                 log_plpar_hcall_return(rc, "H_PIC");
214 }
215
216 /* Track sum of all purrs across all processors. This is used to further */
217 /* calculate usage values by different applications                       */
218
219 static unsigned long get_purr(void)
220 {
221         unsigned long sum_purr = 0;
222         int cpu;
223         struct cpu_usage *cu;
224
225         for_each_cpu(cpu) {
226                 cu = &per_cpu(cpu_usage_array, cpu);
227                 sum_purr += cu->current_tb;
228         }
229         return sum_purr;
230 }
231
232 #define SPLPAR_CHARACTERISTICS_TOKEN 20
233 #define SPLPAR_MAXLENGTH 1026*(sizeof(char))
234
235 /*
236  * parse_system_parameter_string()
237  * Retrieve the potential_processors, max_entitled_capacity and friends
238  * through the get-system-parameter rtas call.  Replace keyword strings as
239  * necessary.
240  */
241 static void parse_system_parameter_string(struct seq_file *m)
242 {
243         int call_status;
244
245         char *local_buffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
246         if (!local_buffer) {
247                 printk(KERN_ERR "%s %s kmalloc failure at line %d \n",
248                        __FILE__, __FUNCTION__, __LINE__);
249                 return;
250         }
251
252         spin_lock(&rtas_data_buf_lock);
253         memset(rtas_data_buf, 0, SPLPAR_MAXLENGTH);
254         call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
255                                 NULL,
256                                 SPLPAR_CHARACTERISTICS_TOKEN,
257                                 __pa(rtas_data_buf));
258         memcpy(local_buffer, rtas_data_buf, SPLPAR_MAXLENGTH);
259         spin_unlock(&rtas_data_buf_lock);
260
261         if (call_status != 0) {
262                 printk(KERN_INFO
263                        "%s %s Error calling get-system-parameter (0x%x)\n",
264                        __FILE__, __FUNCTION__, call_status);
265         } else {
266                 int splpar_strlen;
267                 int idx, w_idx;
268                 char *workbuffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
269                 if (!workbuffer) {
270                         printk(KERN_ERR "%s %s kmalloc failure at line %d \n",
271                                __FILE__, __FUNCTION__, __LINE__);
272                         kfree(local_buffer);
273                         return;
274                 }
275 #ifdef LPARCFG_DEBUG
276                 printk(KERN_INFO "success calling get-system-parameter \n");
277 #endif
278                 splpar_strlen = local_buffer[0] * 16 + local_buffer[1];
279                 local_buffer += 2;      /* step over strlen value */
280
281                 memset(workbuffer, 0, SPLPAR_MAXLENGTH);
282                 w_idx = 0;
283                 idx = 0;
284                 while ((*local_buffer) && (idx < splpar_strlen)) {
285                         workbuffer[w_idx++] = local_buffer[idx++];
286                         if ((local_buffer[idx] == ',')
287                             || (local_buffer[idx] == '\0')) {
288                                 workbuffer[w_idx] = '\0';
289                                 if (w_idx) {
290                                         /* avoid the empty string */
291                                         seq_printf(m, "%s\n", workbuffer);
292                                 }
293                                 memset(workbuffer, 0, SPLPAR_MAXLENGTH);
294                                 idx++;  /* skip the comma */
295                                 w_idx = 0;
296                         } else if (local_buffer[idx] == '=') {
297                                 /* code here to replace workbuffer contents
298                                    with different keyword strings */
299                                 if (0 == strcmp(workbuffer, "MaxEntCap")) {
300                                         strcpy(workbuffer,
301                                                "partition_max_entitled_capacity");
302                                         w_idx = strlen(workbuffer);
303                                 }
304                                 if (0 == strcmp(workbuffer, "MaxPlatProcs")) {
305                                         strcpy(workbuffer,
306                                                "system_potential_processors");
307                                         w_idx = strlen(workbuffer);
308                                 }
309                         }
310                 }
311                 kfree(workbuffer);
312                 local_buffer -= 2;      /* back up over strlen value */
313         }
314         kfree(local_buffer);
315 }
316
317 /* Return the number of processors in the system.
318  * This function reads through the device tree and counts
319  * the virtual processors, this does not include threads.
320  */
321 static int lparcfg_count_active_processors(void)
322 {
323         struct device_node *cpus_dn = NULL;
324         int count = 0;
325
326         while ((cpus_dn = of_find_node_by_type(cpus_dn, "cpu"))) {
327 #ifdef LPARCFG_DEBUG
328                 printk(KERN_ERR "cpus_dn %p \n", cpus_dn);
329 #endif
330                 count++;
331         }
332         return count;
333 }
334
335 static int lparcfg_data(struct seq_file *m, void *v)
336 {
337         int partition_potential_processors;
338         int partition_active_processors;
339         struct device_node *rootdn;
340         const char *model = "";
341         const char *system_id = "";
342         unsigned int *lp_index_ptr, lp_index = 0;
343         struct device_node *rtas_node;
344         int *lrdrp = NULL;
345
346         rootdn = find_path_device("/");
347         if (rootdn) {
348                 model = get_property(rootdn, "model", NULL);
349                 system_id = get_property(rootdn, "system-id", NULL);
350                 lp_index_ptr = (unsigned int *)
351                     get_property(rootdn, "ibm,partition-no", NULL);
352                 if (lp_index_ptr)
353                         lp_index = *lp_index_ptr;
354         }
355
356         seq_printf(m, "%s %s \n", MODULE_NAME, MODULE_VERS);
357
358         seq_printf(m, "serial_number=%s\n", system_id);
359
360         seq_printf(m, "system_type=%s\n", model);
361
362         seq_printf(m, "partition_id=%d\n", (int)lp_index);
363
364         rtas_node = find_path_device("/rtas");
365         if (rtas_node)
366                 lrdrp = (int *)get_property(rtas_node, "ibm,lrdr-capacity",
367                                             NULL);
368
369         if (lrdrp == NULL) {
370                 partition_potential_processors = vdso_data->processorCount;
371         } else {
372                 partition_potential_processors = *(lrdrp + 4);
373         }
374
375         partition_active_processors = lparcfg_count_active_processors();
376
377         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
378                 unsigned long h_entitled, h_unallocated;
379                 unsigned long h_aggregation, h_resource;
380                 unsigned long pool_idle_time, pool_procs;
381                 unsigned long purr;
382
383                 h_get_ppp(&h_entitled, &h_unallocated, &h_aggregation,
384                           &h_resource);
385
386                 seq_printf(m, "R4=0x%lx\n", h_entitled);
387                 seq_printf(m, "R5=0x%lx\n", h_unallocated);
388                 seq_printf(m, "R6=0x%lx\n", h_aggregation);
389                 seq_printf(m, "R7=0x%lx\n", h_resource);
390
391                 purr = get_purr();
392
393                 /* this call handles the ibm,get-system-parameter contents */
394                 parse_system_parameter_string(m);
395
396                 seq_printf(m, "partition_entitled_capacity=%ld\n", h_entitled);
397
398                 seq_printf(m, "group=%ld\n", (h_aggregation >> 2 * 8) & 0xffff);
399
400                 seq_printf(m, "system_active_processors=%ld\n",
401                            (h_resource >> 0 * 8) & 0xffff);
402
403                 /* pool related entries are apropriate for shared configs */
404                 if (lppaca[0].shared_proc) {
405
406                         h_pic(&pool_idle_time, &pool_procs);
407
408                         seq_printf(m, "pool=%ld\n",
409                                    (h_aggregation >> 0 * 8) & 0xffff);
410
411                         /* report pool_capacity in percentage */
412                         seq_printf(m, "pool_capacity=%ld\n",
413                                    ((h_resource >> 2 * 8) & 0xffff) * 100);
414
415                         seq_printf(m, "pool_idle_time=%ld\n", pool_idle_time);
416
417                         seq_printf(m, "pool_num_procs=%ld\n", pool_procs);
418                 }
419
420                 seq_printf(m, "unallocated_capacity_weight=%ld\n",
421                            (h_resource >> 4 * 8) & 0xFF);
422
423                 seq_printf(m, "capacity_weight=%ld\n",
424                            (h_resource >> 5 * 8) & 0xFF);
425
426                 seq_printf(m, "capped=%ld\n", (h_resource >> 6 * 8) & 0x01);
427
428                 seq_printf(m, "unallocated_capacity=%ld\n", h_unallocated);
429
430                 seq_printf(m, "purr=%ld\n", purr);
431
432         } else {                /* non SPLPAR case */
433
434                 seq_printf(m, "system_active_processors=%d\n",
435                            partition_potential_processors);
436
437                 seq_printf(m, "system_potential_processors=%d\n",
438                            partition_potential_processors);
439
440                 seq_printf(m, "partition_max_entitled_capacity=%d\n",
441                            partition_potential_processors * 100);
442
443                 seq_printf(m, "partition_entitled_capacity=%d\n",
444                            partition_active_processors * 100);
445         }
446
447         seq_printf(m, "partition_active_processors=%d\n",
448                    partition_active_processors);
449
450         seq_printf(m, "partition_potential_processors=%d\n",
451                    partition_potential_processors);
452
453         seq_printf(m, "shared_processor_mode=%d\n", lppaca[0].shared_proc);
454
455         return 0;
456 }
457
458 /*
459  * Interface for changing system parameters (variable capacity weight
460  * and entitled capacity).  Format of input is "param_name=value";
461  * anything after value is ignored.  Valid parameters at this time are
462  * "partition_entitled_capacity" and "capacity_weight".  We use
463  * H_SET_PPP to alter parameters.
464  *
465  * This function should be invoked only on systems with
466  * FW_FEATURE_SPLPAR.
467  */
468 static ssize_t lparcfg_write(struct file *file, const char __user * buf,
469                              size_t count, loff_t * off)
470 {
471         char *kbuf;
472         char *tmp;
473         u64 new_entitled, *new_entitled_ptr = &new_entitled;
474         u8 new_weight, *new_weight_ptr = &new_weight;
475
476         unsigned long current_entitled; /* parameters for h_get_ppp */
477         unsigned long dummy;
478         unsigned long resource;
479         u8 current_weight;
480
481         ssize_t retval = -ENOMEM;
482
483         kbuf = kmalloc(count, GFP_KERNEL);
484         if (!kbuf)
485                 goto out;
486
487         retval = -EFAULT;
488         if (copy_from_user(kbuf, buf, count))
489                 goto out;
490
491         retval = -EINVAL;
492         kbuf[count - 1] = '\0';
493         tmp = strchr(kbuf, '=');
494         if (!tmp)
495                 goto out;
496
497         *tmp++ = '\0';
498
499         if (!strcmp(kbuf, "partition_entitled_capacity")) {
500                 char *endp;
501                 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
502                 if (endp == tmp)
503                         goto out;
504                 new_weight_ptr = &current_weight;
505         } else if (!strcmp(kbuf, "capacity_weight")) {
506                 char *endp;
507                 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
508                 if (endp == tmp)
509                         goto out;
510                 new_entitled_ptr = &current_entitled;
511         } else
512                 goto out;
513
514         /* Get our current parameters */
515         retval = h_get_ppp(&current_entitled, &dummy, &dummy, &resource);
516         if (retval) {
517                 retval = -EIO;
518                 goto out;
519         }
520
521         current_weight = (resource >> 5 * 8) & 0xFF;
522
523         pr_debug("%s: current_entitled = %lu, current_weight = %lu\n",
524                  __FUNCTION__, current_entitled, current_weight);
525
526         pr_debug("%s: new_entitled = %lu, new_weight = %lu\n",
527                  __FUNCTION__, *new_entitled_ptr, *new_weight_ptr);
528
529         retval = plpar_hcall_norets(H_SET_PPP, *new_entitled_ptr,
530                                     *new_weight_ptr);
531
532         if (retval == H_Success || retval == H_Constrained) {
533                 retval = count;
534         } else if (retval == H_Busy) {
535                 retval = -EBUSY;
536         } else if (retval == H_Hardware) {
537                 retval = -EIO;
538         } else if (retval == H_Parameter) {
539                 retval = -EINVAL;
540         } else {
541                 printk(KERN_WARNING "%s: received unknown hv return code %ld",
542                        __FUNCTION__, retval);
543                 retval = -EIO;
544         }
545
546 out:
547         kfree(kbuf);
548         return retval;
549 }
550
551 #endif                          /* CONFIG_PPC_PSERIES */
552
553 static int lparcfg_open(struct inode *inode, struct file *file)
554 {
555         return single_open(file, lparcfg_data, NULL);
556 }
557
558 struct file_operations lparcfg_fops = {
559         .owner          = THIS_MODULE,
560         .read           = seq_read,
561         .open           = lparcfg_open,
562         .release        = single_release,
563 };
564
565 int __init lparcfg_init(void)
566 {
567         struct proc_dir_entry *ent;
568         mode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
569
570         /* Allow writing if we have FW_FEATURE_SPLPAR */
571         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
572                 lparcfg_fops.write = lparcfg_write;
573                 mode |= S_IWUSR;
574         }
575
576         ent = create_proc_entry("ppc64/lparcfg", mode, NULL);
577         if (ent) {
578                 ent->proc_fops = &lparcfg_fops;
579                 ent->data = kmalloc(LPARCFG_BUFF_SIZE, GFP_KERNEL);
580                 if (!ent->data) {
581                         printk(KERN_ERR
582                                "Failed to allocate buffer for lparcfg\n");
583                         remove_proc_entry("lparcfg", ent->parent);
584                         return -ENOMEM;
585                 }
586         } else {
587                 printk(KERN_ERR "Failed to create ppc64/lparcfg\n");
588                 return -EIO;
589         }
590
591         proc_ppc64_lparcfg = ent;
592         return 0;
593 }
594
595 void __exit lparcfg_cleanup(void)
596 {
597         if (proc_ppc64_lparcfg) {
598                 kfree(proc_ppc64_lparcfg->data);
599                 remove_proc_entry("lparcfg", proc_ppc64_lparcfg->parent);
600         }
601 }
602
603 module_init(lparcfg_init);
604 module_exit(lparcfg_cleanup);
605 MODULE_DESCRIPTION("Interface for LPAR configuration data");
606 MODULE_AUTHOR("Dave Engebretsen");
607 MODULE_LICENSE("GPL");