Merge git://git.infradead.org/~dedekind/ubi-2.6
[linux-2.6] / 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/module.h>
22 #include <linux/types.h>
23 #include <linux/errno.h>
24 #include <linux/proc_fs.h>
25 #include <linux/init.h>
26 #include <linux/seq_file.h>
27 #include <asm/uaccess.h>
28 #include <asm/iseries/hv_lp_config.h>
29 #include <asm/lppaca.h>
30 #include <asm/hvcall.h>
31 #include <asm/firmware.h>
32 #include <asm/rtas.h>
33 #include <asm/system.h>
34 #include <asm/time.h>
35 #include <asm/prom.h>
36 #include <asm/vdso_datapage.h>
37
38 #define MODULE_VERS "1.7"
39 #define MODULE_NAME "lparcfg"
40
41 /* #define LPARCFG_DEBUG */
42
43 static struct proc_dir_entry *proc_ppc64_lparcfg;
44
45 /*
46  * Track sum of all purrs across all processors. This is used to further
47  * calculate usage values by different applications
48  */
49 static unsigned long get_purr(void)
50 {
51         unsigned long sum_purr = 0;
52         int cpu;
53
54         for_each_possible_cpu(cpu) {
55                 if (firmware_has_feature(FW_FEATURE_ISERIES))
56                         sum_purr += lppaca[cpu].emulated_time_base;
57                 else {
58                         struct cpu_usage *cu;
59
60                         cu = &per_cpu(cpu_usage_array, cpu);
61                         sum_purr += cu->current_tb;
62                 }
63         }
64         return sum_purr;
65 }
66
67 #ifdef CONFIG_PPC_ISERIES
68
69 /*
70  * Methods used to fetch LPAR data when running on an iSeries platform.
71  */
72 static int iseries_lparcfg_data(struct seq_file *m, void *v)
73 {
74         unsigned long pool_id;
75         int shared, entitled_capacity, max_entitled_capacity;
76         int processors, max_processors;
77         unsigned long purr = get_purr();
78
79         shared = (int)(local_paca->lppaca_ptr->shared_proc);
80
81         seq_printf(m, "system_active_processors=%d\n",
82                    (int)HvLpConfig_getSystemPhysicalProcessors());
83
84         seq_printf(m, "system_potential_processors=%d\n",
85                    (int)HvLpConfig_getSystemPhysicalProcessors());
86
87         processors = (int)HvLpConfig_getPhysicalProcessors();
88         seq_printf(m, "partition_active_processors=%d\n", processors);
89
90         max_processors = (int)HvLpConfig_getMaxPhysicalProcessors();
91         seq_printf(m, "partition_potential_processors=%d\n", max_processors);
92
93         if (shared) {
94                 entitled_capacity = HvLpConfig_getSharedProcUnits();
95                 max_entitled_capacity = HvLpConfig_getMaxSharedProcUnits();
96         } else {
97                 entitled_capacity = processors * 100;
98                 max_entitled_capacity = max_processors * 100;
99         }
100         seq_printf(m, "partition_entitled_capacity=%d\n", entitled_capacity);
101
102         seq_printf(m, "partition_max_entitled_capacity=%d\n",
103                    max_entitled_capacity);
104
105         if (shared) {
106                 pool_id = HvLpConfig_getSharedPoolIndex();
107                 seq_printf(m, "pool=%d\n", (int)pool_id);
108                 seq_printf(m, "pool_capacity=%d\n",
109                            (int)(HvLpConfig_getNumProcsInSharedPool(pool_id) *
110                                  100));
111                 seq_printf(m, "purr=%ld\n", purr);
112         }
113
114         seq_printf(m, "shared_processor_mode=%d\n", shared);
115
116         return 0;
117 }
118
119 #else                           /* CONFIG_PPC_ISERIES */
120
121 static int iseries_lparcfg_data(struct seq_file *m, void *v)
122 {
123         return 0;
124 }
125
126 #endif                          /* CONFIG_PPC_ISERIES */
127
128 #ifdef CONFIG_PPC_PSERIES
129 /*
130  * Methods used to fetch LPAR data when running on a pSeries platform.
131  */
132 static void log_plpar_hcall_return(unsigned long rc, char *tag)
133 {
134         switch(rc) {
135         case 0:
136                 return;
137         case H_HARDWARE:
138                 printk(KERN_INFO "plpar-hcall (%s) "
139                                 "Hardware fault\n", tag);
140                 return;
141         case H_FUNCTION:
142                 printk(KERN_INFO "plpar-hcall (%s) "
143                                 "Function not allowed\n", tag);
144                 return;
145         case H_AUTHORITY:
146                 printk(KERN_INFO "plpar-hcall (%s) "
147                                 "Not authorized to this function\n", tag);
148                 return;
149         case H_PARAMETER:
150                 printk(KERN_INFO "plpar-hcall (%s) "
151                                 "Bad parameter(s)\n",tag);
152                 return;
153         default:
154                 printk(KERN_INFO "plpar-hcall (%s) "
155                                 "Unexpected rc(0x%lx)\n", tag, rc);
156         }
157 }
158
159 /*
160  * H_GET_PPP hcall returns info in 4 parms.
161  *  entitled_capacity,unallocated_capacity,
162  *  aggregation, resource_capability).
163  *
164  *  R4 = Entitled Processor Capacity Percentage.
165  *  R5 = Unallocated Processor Capacity Percentage.
166  *  R6 (AABBCCDDEEFFGGHH).
167  *      XXXX - reserved (0)
168  *          XXXX - reserved (0)
169  *              XXXX - Group Number
170  *                  XXXX - Pool Number.
171  *  R7 (IIJJKKLLMMNNOOPP).
172  *      XX - reserved. (0)
173  *        XX - bit 0-6 reserved (0).   bit 7 is Capped indicator.
174  *          XX - variable processor Capacity Weight
175  *            XX - Unallocated Variable Processor Capacity Weight.
176  *              XXXX - Active processors in Physical Processor Pool.
177  *                  XXXX  - Processors active on platform.
178  */
179 static unsigned int h_get_ppp(unsigned long *entitled,
180                               unsigned long *unallocated,
181                               unsigned long *aggregation,
182                               unsigned long *resource)
183 {
184         unsigned long rc;
185         unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
186
187         rc = plpar_hcall(H_GET_PPP, retbuf);
188
189         *entitled = retbuf[0];
190         *unallocated = retbuf[1];
191         *aggregation = retbuf[2];
192         *resource = retbuf[3];
193
194         log_plpar_hcall_return(rc, "H_GET_PPP");
195
196         return rc;
197 }
198
199 static void h_pic(unsigned long *pool_idle_time, unsigned long *num_procs)
200 {
201         unsigned long rc;
202         unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
203
204         rc = plpar_hcall(H_PIC, retbuf);
205
206         *pool_idle_time = retbuf[0];
207         *num_procs = retbuf[1];
208
209         if (rc != H_AUTHORITY)
210                 log_plpar_hcall_return(rc, "H_PIC");
211 }
212
213 #define SPLPAR_CHARACTERISTICS_TOKEN 20
214 #define SPLPAR_MAXLENGTH 1026*(sizeof(char))
215
216 /*
217  * parse_system_parameter_string()
218  * Retrieve the potential_processors, max_entitled_capacity and friends
219  * through the get-system-parameter rtas call.  Replace keyword strings as
220  * necessary.
221  */
222 static void parse_system_parameter_string(struct seq_file *m)
223 {
224         int call_status;
225
226         unsigned char *local_buffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
227         if (!local_buffer) {
228                 printk(KERN_ERR "%s %s kmalloc failure at line %d \n",
229                        __FILE__, __func__, __LINE__);
230                 return;
231         }
232
233         spin_lock(&rtas_data_buf_lock);
234         memset(rtas_data_buf, 0, SPLPAR_MAXLENGTH);
235         call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
236                                 NULL,
237                                 SPLPAR_CHARACTERISTICS_TOKEN,
238                                 __pa(rtas_data_buf),
239                                 RTAS_DATA_BUF_SIZE);
240         memcpy(local_buffer, rtas_data_buf, SPLPAR_MAXLENGTH);
241         spin_unlock(&rtas_data_buf_lock);
242
243         if (call_status != 0) {
244                 printk(KERN_INFO
245                        "%s %s Error calling get-system-parameter (0x%x)\n",
246                        __FILE__, __func__, call_status);
247         } else {
248                 int splpar_strlen;
249                 int idx, w_idx;
250                 char *workbuffer = kzalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
251                 if (!workbuffer) {
252                         printk(KERN_ERR "%s %s kmalloc failure at line %d \n",
253                                __FILE__, __func__, __LINE__);
254                         kfree(local_buffer);
255                         return;
256                 }
257 #ifdef LPARCFG_DEBUG
258                 printk(KERN_INFO "success calling get-system-parameter \n");
259 #endif
260                 splpar_strlen = local_buffer[0] * 256 + local_buffer[1];
261                 local_buffer += 2;      /* step over strlen value */
262
263                 w_idx = 0;
264                 idx = 0;
265                 while ((*local_buffer) && (idx < splpar_strlen)) {
266                         workbuffer[w_idx++] = local_buffer[idx++];
267                         if ((local_buffer[idx] == ',')
268                             || (local_buffer[idx] == '\0')) {
269                                 workbuffer[w_idx] = '\0';
270                                 if (w_idx) {
271                                         /* avoid the empty string */
272                                         seq_printf(m, "%s\n", workbuffer);
273                                 }
274                                 memset(workbuffer, 0, SPLPAR_MAXLENGTH);
275                                 idx++;  /* skip the comma */
276                                 w_idx = 0;
277                         } else if (local_buffer[idx] == '=') {
278                                 /* code here to replace workbuffer contents
279                                    with different keyword strings */
280                                 if (0 == strcmp(workbuffer, "MaxEntCap")) {
281                                         strcpy(workbuffer,
282                                                "partition_max_entitled_capacity");
283                                         w_idx = strlen(workbuffer);
284                                 }
285                                 if (0 == strcmp(workbuffer, "MaxPlatProcs")) {
286                                         strcpy(workbuffer,
287                                                "system_potential_processors");
288                                         w_idx = strlen(workbuffer);
289                                 }
290                         }
291                 }
292                 kfree(workbuffer);
293                 local_buffer -= 2;      /* back up over strlen value */
294         }
295         kfree(local_buffer);
296 }
297
298 /* Return the number of processors in the system.
299  * This function reads through the device tree and counts
300  * the virtual processors, this does not include threads.
301  */
302 static int lparcfg_count_active_processors(void)
303 {
304         struct device_node *cpus_dn = NULL;
305         int count = 0;
306
307         while ((cpus_dn = of_find_node_by_type(cpus_dn, "cpu"))) {
308 #ifdef LPARCFG_DEBUG
309                 printk(KERN_ERR "cpus_dn %p \n", cpus_dn);
310 #endif
311                 count++;
312         }
313         return count;
314 }
315
316 static int pseries_lparcfg_data(struct seq_file *m, void *v)
317 {
318         int partition_potential_processors;
319         int partition_active_processors;
320         struct device_node *rtas_node;
321         const int *lrdrp = NULL;
322
323         rtas_node = of_find_node_by_path("/rtas");
324         if (rtas_node)
325                 lrdrp = of_get_property(rtas_node, "ibm,lrdr-capacity", NULL);
326
327         if (lrdrp == NULL) {
328                 partition_potential_processors = vdso_data->processorCount;
329         } else {
330                 partition_potential_processors = *(lrdrp + 4);
331         }
332         of_node_put(rtas_node);
333
334         partition_active_processors = lparcfg_count_active_processors();
335
336         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
337                 unsigned long h_entitled, h_unallocated;
338                 unsigned long h_aggregation, h_resource;
339                 unsigned long pool_idle_time, pool_procs;
340                 unsigned long purr;
341
342                 h_get_ppp(&h_entitled, &h_unallocated, &h_aggregation,
343                           &h_resource);
344
345                 seq_printf(m, "R4=0x%lx\n", h_entitled);
346                 seq_printf(m, "R5=0x%lx\n", h_unallocated);
347                 seq_printf(m, "R6=0x%lx\n", h_aggregation);
348                 seq_printf(m, "R7=0x%lx\n", h_resource);
349
350                 purr = get_purr();
351
352                 /* this call handles the ibm,get-system-parameter contents */
353                 parse_system_parameter_string(m);
354
355                 seq_printf(m, "partition_entitled_capacity=%ld\n", h_entitled);
356
357                 seq_printf(m, "group=%ld\n", (h_aggregation >> 2 * 8) & 0xffff);
358
359                 seq_printf(m, "system_active_processors=%ld\n",
360                            (h_resource >> 0 * 8) & 0xffff);
361
362                 /* pool related entries are apropriate for shared configs */
363                 if (lppaca[0].shared_proc) {
364
365                         h_pic(&pool_idle_time, &pool_procs);
366
367                         seq_printf(m, "pool=%ld\n",
368                                    (h_aggregation >> 0 * 8) & 0xffff);
369
370                         /* report pool_capacity in percentage */
371                         seq_printf(m, "pool_capacity=%ld\n",
372                                    ((h_resource >> 2 * 8) & 0xffff) * 100);
373
374                         seq_printf(m, "pool_idle_time=%ld\n", pool_idle_time);
375
376                         seq_printf(m, "pool_num_procs=%ld\n", pool_procs);
377                 }
378
379                 seq_printf(m, "unallocated_capacity_weight=%ld\n",
380                            (h_resource >> 4 * 8) & 0xFF);
381
382                 seq_printf(m, "capacity_weight=%ld\n",
383                            (h_resource >> 5 * 8) & 0xFF);
384
385                 seq_printf(m, "capped=%ld\n", (h_resource >> 6 * 8) & 0x01);
386
387                 seq_printf(m, "unallocated_capacity=%ld\n", h_unallocated);
388
389                 seq_printf(m, "purr=%ld\n", purr);
390
391         } else {                /* non SPLPAR case */
392
393                 seq_printf(m, "system_active_processors=%d\n",
394                            partition_potential_processors);
395
396                 seq_printf(m, "system_potential_processors=%d\n",
397                            partition_potential_processors);
398
399                 seq_printf(m, "partition_max_entitled_capacity=%d\n",
400                            partition_potential_processors * 100);
401
402                 seq_printf(m, "partition_entitled_capacity=%d\n",
403                            partition_active_processors * 100);
404         }
405
406         seq_printf(m, "partition_active_processors=%d\n",
407                    partition_active_processors);
408
409         seq_printf(m, "partition_potential_processors=%d\n",
410                    partition_potential_processors);
411
412         seq_printf(m, "shared_processor_mode=%d\n", lppaca[0].shared_proc);
413
414         return 0;
415 }
416
417 /*
418  * Interface for changing system parameters (variable capacity weight
419  * and entitled capacity).  Format of input is "param_name=value";
420  * anything after value is ignored.  Valid parameters at this time are
421  * "partition_entitled_capacity" and "capacity_weight".  We use
422  * H_SET_PPP to alter parameters.
423  *
424  * This function should be invoked only on systems with
425  * FW_FEATURE_SPLPAR.
426  */
427 static ssize_t lparcfg_write(struct file *file, const char __user * buf,
428                              size_t count, loff_t * off)
429 {
430         char *kbuf;
431         char *tmp;
432         u64 new_entitled, *new_entitled_ptr = &new_entitled;
433         u8 new_weight, *new_weight_ptr = &new_weight;
434
435         unsigned long current_entitled; /* parameters for h_get_ppp */
436         unsigned long dummy;
437         unsigned long resource;
438         u8 current_weight;
439
440         ssize_t retval = -ENOMEM;
441
442         if (!firmware_has_feature(FW_FEATURE_SPLPAR) ||
443                         firmware_has_feature(FW_FEATURE_ISERIES))
444                 return -EINVAL;
445
446         kbuf = kmalloc(count, GFP_KERNEL);
447         if (!kbuf)
448                 goto out;
449
450         retval = -EFAULT;
451         if (copy_from_user(kbuf, buf, count))
452                 goto out;
453
454         retval = -EINVAL;
455         kbuf[count - 1] = '\0';
456         tmp = strchr(kbuf, '=');
457         if (!tmp)
458                 goto out;
459
460         *tmp++ = '\0';
461
462         if (!strcmp(kbuf, "partition_entitled_capacity")) {
463                 char *endp;
464                 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
465                 if (endp == tmp)
466                         goto out;
467                 new_weight_ptr = &current_weight;
468         } else if (!strcmp(kbuf, "capacity_weight")) {
469                 char *endp;
470                 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
471                 if (endp == tmp)
472                         goto out;
473                 new_entitled_ptr = &current_entitled;
474         } else
475                 goto out;
476
477         /* Get our current parameters */
478         retval = h_get_ppp(&current_entitled, &dummy, &dummy, &resource);
479         if (retval) {
480                 retval = -EIO;
481                 goto out;
482         }
483
484         current_weight = (resource >> 5 * 8) & 0xFF;
485
486         pr_debug("%s: current_entitled = %lu, current_weight = %u\n",
487                  __func__, current_entitled, current_weight);
488
489         pr_debug("%s: new_entitled = %lu, new_weight = %u\n",
490                  __func__, *new_entitled_ptr, *new_weight_ptr);
491
492         retval = plpar_hcall_norets(H_SET_PPP, *new_entitled_ptr,
493                                     *new_weight_ptr);
494
495         if (retval == H_SUCCESS || retval == H_CONSTRAINED) {
496                 retval = count;
497         } else if (retval == H_BUSY) {
498                 retval = -EBUSY;
499         } else if (retval == H_HARDWARE) {
500                 retval = -EIO;
501         } else if (retval == H_PARAMETER) {
502                 retval = -EINVAL;
503         } else {
504                 printk(KERN_WARNING "%s: received unknown hv return code %ld",
505                        __func__, retval);
506                 retval = -EIO;
507         }
508
509 out:
510         kfree(kbuf);
511         return retval;
512 }
513
514 #else                           /* CONFIG_PPC_PSERIES */
515
516 static int pseries_lparcfg_data(struct seq_file *m, void *v)
517 {
518         return 0;
519 }
520
521 static ssize_t lparcfg_write(struct file *file, const char __user * buf,
522                              size_t count, loff_t * off)
523 {
524         return -EINVAL;
525 }
526
527 #endif                          /* CONFIG_PPC_PSERIES */
528
529 static int lparcfg_data(struct seq_file *m, void *v)
530 {
531         struct device_node *rootdn;
532         const char *model = "";
533         const char *system_id = "";
534         const char *tmp;
535         const unsigned int *lp_index_ptr;
536         unsigned int lp_index = 0;
537
538         seq_printf(m, "%s %s \n", MODULE_NAME, MODULE_VERS);
539
540         rootdn = of_find_node_by_path("/");
541         if (rootdn) {
542                 tmp = of_get_property(rootdn, "model", NULL);
543                 if (tmp) {
544                         model = tmp;
545                         /* Skip "IBM," - see platforms/iseries/dt.c */
546                         if (firmware_has_feature(FW_FEATURE_ISERIES))
547                                 model += 4;
548                 }
549                 tmp = of_get_property(rootdn, "system-id", NULL);
550                 if (tmp) {
551                         system_id = tmp;
552                         /* Skip "IBM," - see platforms/iseries/dt.c */
553                         if (firmware_has_feature(FW_FEATURE_ISERIES))
554                                 system_id += 4;
555                 }
556                 lp_index_ptr = of_get_property(rootdn, "ibm,partition-no",
557                                         NULL);
558                 if (lp_index_ptr)
559                         lp_index = *lp_index_ptr;
560                 of_node_put(rootdn);
561         }
562         seq_printf(m, "serial_number=%s\n", system_id);
563         seq_printf(m, "system_type=%s\n", model);
564         seq_printf(m, "partition_id=%d\n", (int)lp_index);
565
566         if (firmware_has_feature(FW_FEATURE_ISERIES))
567                 return iseries_lparcfg_data(m, v);
568         return pseries_lparcfg_data(m, v);
569 }
570
571 static int lparcfg_open(struct inode *inode, struct file *file)
572 {
573         return single_open(file, lparcfg_data, NULL);
574 }
575
576 const struct file_operations lparcfg_fops = {
577         .owner          = THIS_MODULE,
578         .read           = seq_read,
579         .write          = lparcfg_write,
580         .open           = lparcfg_open,
581         .release        = single_release,
582 };
583
584 int __init lparcfg_init(void)
585 {
586         struct proc_dir_entry *ent;
587         mode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
588
589         /* Allow writing if we have FW_FEATURE_SPLPAR */
590         if (firmware_has_feature(FW_FEATURE_SPLPAR) &&
591                         !firmware_has_feature(FW_FEATURE_ISERIES))
592                 mode |= S_IWUSR;
593
594         ent = create_proc_entry("ppc64/lparcfg", mode, NULL);
595         if (ent) {
596                 ent->proc_fops = &lparcfg_fops;
597         } else {
598                 printk(KERN_ERR "Failed to create ppc64/lparcfg\n");
599                 return -EIO;
600         }
601
602         proc_ppc64_lparcfg = ent;
603         return 0;
604 }
605
606 void __exit lparcfg_cleanup(void)
607 {
608         if (proc_ppc64_lparcfg)
609                 remove_proc_entry("lparcfg", proc_ppc64_lparcfg->parent);
610 }
611
612 module_init(lparcfg_init);
613 module_exit(lparcfg_cleanup);
614 MODULE_DESCRIPTION("Interface for LPAR configuration data");
615 MODULE_AUTHOR("Dave Engebretsen");
616 MODULE_LICENSE("GPL");