Remove obsolete #include <linux/config.h>
[linux-3.10.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/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/iseries/it_exp_vpd_panel.h>
36 #include <asm/prom.h>
37 #include <asm/vdso_datapage.h>
38
39 #define MODULE_VERS "1.7"
40 #define MODULE_NAME "lparcfg"
41
42 /* #define LPARCFG_DEBUG */
43
44 static struct proc_dir_entry *proc_ppc64_lparcfg;
45 #define LPARCFG_BUFF_SIZE 4096
46
47 /*
48  * Track sum of all purrs across all processors. This is used to further
49  * calculate usage values by different applications
50  */
51 static unsigned long get_purr(void)
52 {
53         unsigned long sum_purr = 0;
54         int cpu;
55
56         for_each_possible_cpu(cpu) {
57                 if (firmware_has_feature(FW_FEATURE_ISERIES))
58                         sum_purr += lppaca[cpu].emulated_time_base;
59                 else {
60                         struct cpu_usage *cu;
61
62                         cu = &per_cpu(cpu_usage_array, cpu);
63                         sum_purr += cu->current_tb;
64                 }
65         }
66         return sum_purr;
67 }
68
69 #ifdef CONFIG_PPC_ISERIES
70
71 /*
72  * Methods used to fetch LPAR data when running on an iSeries platform.
73  */
74 static int iseries_lparcfg_data(struct seq_file *m, void *v)
75 {
76         unsigned long pool_id;
77         int shared, entitled_capacity, max_entitled_capacity;
78         int processors, max_processors;
79         unsigned long purr = get_purr();
80
81         shared = (int)(get_lppaca()->shared_proc);
82
83         seq_printf(m, "system_active_processors=%d\n",
84                    (int)HvLpConfig_getSystemPhysicalProcessors());
85
86         seq_printf(m, "system_potential_processors=%d\n",
87                    (int)HvLpConfig_getSystemPhysicalProcessors());
88
89         processors = (int)HvLpConfig_getPhysicalProcessors();
90         seq_printf(m, "partition_active_processors=%d\n", processors);
91
92         max_processors = (int)HvLpConfig_getMaxPhysicalProcessors();
93         seq_printf(m, "partition_potential_processors=%d\n", max_processors);
94
95         if (shared) {
96                 entitled_capacity = HvLpConfig_getSharedProcUnits();
97                 max_entitled_capacity = HvLpConfig_getMaxSharedProcUnits();
98         } else {
99                 entitled_capacity = processors * 100;
100                 max_entitled_capacity = max_processors * 100;
101         }
102         seq_printf(m, "partition_entitled_capacity=%d\n", entitled_capacity);
103
104         seq_printf(m, "partition_max_entitled_capacity=%d\n",
105                    max_entitled_capacity);
106
107         if (shared) {
108                 pool_id = HvLpConfig_getSharedPoolIndex();
109                 seq_printf(m, "pool=%d\n", (int)pool_id);
110                 seq_printf(m, "pool_capacity=%d\n",
111                            (int)(HvLpConfig_getNumProcsInSharedPool(pool_id) *
112                                  100));
113                 seq_printf(m, "purr=%ld\n", purr);
114         }
115
116         seq_printf(m, "shared_processor_mode=%d\n", shared);
117
118         return 0;
119 }
120
121 #else                           /* CONFIG_PPC_ISERIES */
122
123 static int iseries_lparcfg_data(struct seq_file *m, void *v)
124 {
125         return 0;
126 }
127
128 #endif                          /* CONFIG_PPC_ISERIES */
129
130 #ifdef CONFIG_PPC_PSERIES
131 /*
132  * Methods used to fetch LPAR data when running on a pSeries platform.
133  */
134 /* find a better place for this function... */
135 static void log_plpar_hcall_return(unsigned long rc, char *tag)
136 {
137         if (rc == 0)            /* success, return */
138                 return;
139 /* check for null tag ? */
140         if (rc == H_HARDWARE)
141                 printk(KERN_INFO
142                        "plpar-hcall (%s) failed with hardware fault\n", tag);
143         else if (rc == H_FUNCTION)
144                 printk(KERN_INFO
145                        "plpar-hcall (%s) failed; function not allowed\n", tag);
146         else if (rc == H_AUTHORITY)
147                 printk(KERN_INFO
148                        "plpar-hcall (%s) failed; not authorized to this"
149                        " function\n", tag);
150         else if (rc == H_PARAMETER)
151                 printk(KERN_INFO "plpar-hcall (%s) failed; Bad parameter(s)\n",
152                        tag);
153         else
154                 printk(KERN_INFO
155                        "plpar-hcall (%s) failed with unexpected rc(0x%lx)\n",
156                        tag, rc);
157
158 }
159
160 /*
161  * H_GET_PPP hcall returns info in 4 parms.
162  *  entitled_capacity,unallocated_capacity,
163  *  aggregation, resource_capability).
164  *
165  *  R4 = Entitled Processor Capacity Percentage.
166  *  R5 = Unallocated Processor Capacity Percentage.
167  *  R6 (AABBCCDDEEFFGGHH).
168  *      XXXX - reserved (0)
169  *          XXXX - reserved (0)
170  *              XXXX - Group Number
171  *                  XXXX - Pool Number.
172  *  R7 (IIJJKKLLMMNNOOPP).
173  *      XX - reserved. (0)
174  *        XX - bit 0-6 reserved (0).   bit 7 is Capped indicator.
175  *          XX - variable processor Capacity Weight
176  *            XX - Unallocated Variable Processor Capacity Weight.
177  *              XXXX - Active processors in Physical Processor Pool.
178  *                  XXXX  - Processors active on platform.
179  */
180 static unsigned int h_get_ppp(unsigned long *entitled,
181                               unsigned long *unallocated,
182                               unsigned long *aggregation,
183                               unsigned long *resource)
184 {
185         unsigned long rc;
186         rc = plpar_hcall_4out(H_GET_PPP, 0, 0, 0, 0, entitled, unallocated,
187                               aggregation, resource);
188
189         log_plpar_hcall_return(rc, "H_GET_PPP");
190
191         return rc;
192 }
193
194 static void h_pic(unsigned long *pool_idle_time, unsigned long *num_procs)
195 {
196         unsigned long rc;
197         unsigned long dummy;
198         rc = plpar_hcall(H_PIC, 0, 0, 0, 0, pool_idle_time, num_procs, &dummy);
199
200         if (rc != H_AUTHORITY)
201                 log_plpar_hcall_return(rc, "H_PIC");
202 }
203
204 #define SPLPAR_CHARACTERISTICS_TOKEN 20
205 #define SPLPAR_MAXLENGTH 1026*(sizeof(char))
206
207 /*
208  * parse_system_parameter_string()
209  * Retrieve the potential_processors, max_entitled_capacity and friends
210  * through the get-system-parameter rtas call.  Replace keyword strings as
211  * necessary.
212  */
213 static void parse_system_parameter_string(struct seq_file *m)
214 {
215         int call_status;
216
217         unsigned char *local_buffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
218         if (!local_buffer) {
219                 printk(KERN_ERR "%s %s kmalloc failure at line %d \n",
220                        __FILE__, __FUNCTION__, __LINE__);
221                 return;
222         }
223
224         spin_lock(&rtas_data_buf_lock);
225         memset(rtas_data_buf, 0, SPLPAR_MAXLENGTH);
226         call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
227                                 NULL,
228                                 SPLPAR_CHARACTERISTICS_TOKEN,
229                                 __pa(rtas_data_buf),
230                                 RTAS_DATA_BUF_SIZE);
231         memcpy(local_buffer, rtas_data_buf, SPLPAR_MAXLENGTH);
232         spin_unlock(&rtas_data_buf_lock);
233
234         if (call_status != 0) {
235                 printk(KERN_INFO
236                        "%s %s Error calling get-system-parameter (0x%x)\n",
237                        __FILE__, __FUNCTION__, call_status);
238         } else {
239                 int splpar_strlen;
240                 int idx, w_idx;
241                 char *workbuffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
242                 if (!workbuffer) {
243                         printk(KERN_ERR "%s %s kmalloc failure at line %d \n",
244                                __FILE__, __FUNCTION__, __LINE__);
245                         kfree(local_buffer);
246                         return;
247                 }
248 #ifdef LPARCFG_DEBUG
249                 printk(KERN_INFO "success calling get-system-parameter \n");
250 #endif
251                 splpar_strlen = local_buffer[0] * 256 + local_buffer[1];
252                 local_buffer += 2;      /* step over strlen value */
253
254                 memset(workbuffer, 0, SPLPAR_MAXLENGTH);
255                 w_idx = 0;
256                 idx = 0;
257                 while ((*local_buffer) && (idx < splpar_strlen)) {
258                         workbuffer[w_idx++] = local_buffer[idx++];
259                         if ((local_buffer[idx] == ',')
260                             || (local_buffer[idx] == '\0')) {
261                                 workbuffer[w_idx] = '\0';
262                                 if (w_idx) {
263                                         /* avoid the empty string */
264                                         seq_printf(m, "%s\n", workbuffer);
265                                 }
266                                 memset(workbuffer, 0, SPLPAR_MAXLENGTH);
267                                 idx++;  /* skip the comma */
268                                 w_idx = 0;
269                         } else if (local_buffer[idx] == '=') {
270                                 /* code here to replace workbuffer contents
271                                    with different keyword strings */
272                                 if (0 == strcmp(workbuffer, "MaxEntCap")) {
273                                         strcpy(workbuffer,
274                                                "partition_max_entitled_capacity");
275                                         w_idx = strlen(workbuffer);
276                                 }
277                                 if (0 == strcmp(workbuffer, "MaxPlatProcs")) {
278                                         strcpy(workbuffer,
279                                                "system_potential_processors");
280                                         w_idx = strlen(workbuffer);
281                                 }
282                         }
283                 }
284                 kfree(workbuffer);
285                 local_buffer -= 2;      /* back up over strlen value */
286         }
287         kfree(local_buffer);
288 }
289
290 /* Return the number of processors in the system.
291  * This function reads through the device tree and counts
292  * the virtual processors, this does not include threads.
293  */
294 static int lparcfg_count_active_processors(void)
295 {
296         struct device_node *cpus_dn = NULL;
297         int count = 0;
298
299         while ((cpus_dn = of_find_node_by_type(cpus_dn, "cpu"))) {
300 #ifdef LPARCFG_DEBUG
301                 printk(KERN_ERR "cpus_dn %p \n", cpus_dn);
302 #endif
303                 count++;
304         }
305         return count;
306 }
307
308 static int pseries_lparcfg_data(struct seq_file *m, void *v)
309 {
310         int partition_potential_processors;
311         int partition_active_processors;
312         struct device_node *rtas_node;
313         int *lrdrp = NULL;
314
315         rtas_node = find_path_device("/rtas");
316         if (rtas_node)
317                 lrdrp = (int *)get_property(rtas_node, "ibm,lrdr-capacity",
318                                             NULL);
319
320         if (lrdrp == NULL) {
321                 partition_potential_processors = vdso_data->processorCount;
322         } else {
323                 partition_potential_processors = *(lrdrp + 4);
324         }
325
326         partition_active_processors = lparcfg_count_active_processors();
327
328         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
329                 unsigned long h_entitled, h_unallocated;
330                 unsigned long h_aggregation, h_resource;
331                 unsigned long pool_idle_time, pool_procs;
332                 unsigned long purr;
333
334                 h_get_ppp(&h_entitled, &h_unallocated, &h_aggregation,
335                           &h_resource);
336
337                 seq_printf(m, "R4=0x%lx\n", h_entitled);
338                 seq_printf(m, "R5=0x%lx\n", h_unallocated);
339                 seq_printf(m, "R6=0x%lx\n", h_aggregation);
340                 seq_printf(m, "R7=0x%lx\n", h_resource);
341
342                 purr = get_purr();
343
344                 /* this call handles the ibm,get-system-parameter contents */
345                 parse_system_parameter_string(m);
346
347                 seq_printf(m, "partition_entitled_capacity=%ld\n", h_entitled);
348
349                 seq_printf(m, "group=%ld\n", (h_aggregation >> 2 * 8) & 0xffff);
350
351                 seq_printf(m, "system_active_processors=%ld\n",
352                            (h_resource >> 0 * 8) & 0xffff);
353
354                 /* pool related entries are apropriate for shared configs */
355                 if (lppaca[0].shared_proc) {
356
357                         h_pic(&pool_idle_time, &pool_procs);
358
359                         seq_printf(m, "pool=%ld\n",
360                                    (h_aggregation >> 0 * 8) & 0xffff);
361
362                         /* report pool_capacity in percentage */
363                         seq_printf(m, "pool_capacity=%ld\n",
364                                    ((h_resource >> 2 * 8) & 0xffff) * 100);
365
366                         seq_printf(m, "pool_idle_time=%ld\n", pool_idle_time);
367
368                         seq_printf(m, "pool_num_procs=%ld\n", pool_procs);
369                 }
370
371                 seq_printf(m, "unallocated_capacity_weight=%ld\n",
372                            (h_resource >> 4 * 8) & 0xFF);
373
374                 seq_printf(m, "capacity_weight=%ld\n",
375                            (h_resource >> 5 * 8) & 0xFF);
376
377                 seq_printf(m, "capped=%ld\n", (h_resource >> 6 * 8) & 0x01);
378
379                 seq_printf(m, "unallocated_capacity=%ld\n", h_unallocated);
380
381                 seq_printf(m, "purr=%ld\n", purr);
382
383         } else {                /* non SPLPAR case */
384
385                 seq_printf(m, "system_active_processors=%d\n",
386                            partition_potential_processors);
387
388                 seq_printf(m, "system_potential_processors=%d\n",
389                            partition_potential_processors);
390
391                 seq_printf(m, "partition_max_entitled_capacity=%d\n",
392                            partition_potential_processors * 100);
393
394                 seq_printf(m, "partition_entitled_capacity=%d\n",
395                            partition_active_processors * 100);
396         }
397
398         seq_printf(m, "partition_active_processors=%d\n",
399                    partition_active_processors);
400
401         seq_printf(m, "partition_potential_processors=%d\n",
402                    partition_potential_processors);
403
404         seq_printf(m, "shared_processor_mode=%d\n", lppaca[0].shared_proc);
405
406         return 0;
407 }
408
409 /*
410  * Interface for changing system parameters (variable capacity weight
411  * and entitled capacity).  Format of input is "param_name=value";
412  * anything after value is ignored.  Valid parameters at this time are
413  * "partition_entitled_capacity" and "capacity_weight".  We use
414  * H_SET_PPP to alter parameters.
415  *
416  * This function should be invoked only on systems with
417  * FW_FEATURE_SPLPAR.
418  */
419 static ssize_t lparcfg_write(struct file *file, const char __user * buf,
420                              size_t count, loff_t * off)
421 {
422         char *kbuf;
423         char *tmp;
424         u64 new_entitled, *new_entitled_ptr = &new_entitled;
425         u8 new_weight, *new_weight_ptr = &new_weight;
426
427         unsigned long current_entitled; /* parameters for h_get_ppp */
428         unsigned long dummy;
429         unsigned long resource;
430         u8 current_weight;
431
432         ssize_t retval = -ENOMEM;
433
434         kbuf = kmalloc(count, GFP_KERNEL);
435         if (!kbuf)
436                 goto out;
437
438         retval = -EFAULT;
439         if (copy_from_user(kbuf, buf, count))
440                 goto out;
441
442         retval = -EINVAL;
443         kbuf[count - 1] = '\0';
444         tmp = strchr(kbuf, '=');
445         if (!tmp)
446                 goto out;
447
448         *tmp++ = '\0';
449
450         if (!strcmp(kbuf, "partition_entitled_capacity")) {
451                 char *endp;
452                 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
453                 if (endp == tmp)
454                         goto out;
455                 new_weight_ptr = &current_weight;
456         } else if (!strcmp(kbuf, "capacity_weight")) {
457                 char *endp;
458                 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
459                 if (endp == tmp)
460                         goto out;
461                 new_entitled_ptr = &current_entitled;
462         } else
463                 goto out;
464
465         /* Get our current parameters */
466         retval = h_get_ppp(&current_entitled, &dummy, &dummy, &resource);
467         if (retval) {
468                 retval = -EIO;
469                 goto out;
470         }
471
472         current_weight = (resource >> 5 * 8) & 0xFF;
473
474         pr_debug("%s: current_entitled = %lu, current_weight = %u\n",
475                  __FUNCTION__, current_entitled, current_weight);
476
477         pr_debug("%s: new_entitled = %lu, new_weight = %u\n",
478                  __FUNCTION__, *new_entitled_ptr, *new_weight_ptr);
479
480         retval = plpar_hcall_norets(H_SET_PPP, *new_entitled_ptr,
481                                     *new_weight_ptr);
482
483         if (retval == H_SUCCESS || retval == H_CONSTRAINED) {
484                 retval = count;
485         } else if (retval == H_BUSY) {
486                 retval = -EBUSY;
487         } else if (retval == H_HARDWARE) {
488                 retval = -EIO;
489         } else if (retval == H_PARAMETER) {
490                 retval = -EINVAL;
491         } else {
492                 printk(KERN_WARNING "%s: received unknown hv return code %ld",
493                        __FUNCTION__, retval);
494                 retval = -EIO;
495         }
496
497 out:
498         kfree(kbuf);
499         return retval;
500 }
501
502 #else                           /* CONFIG_PPC_PSERIES */
503
504 static int pseries_lparcfg_data(struct seq_file *m, void *v)
505 {
506         return 0;
507 }
508
509 static ssize_t lparcfg_write(struct file *file, const char __user * buf,
510                              size_t count, loff_t * off)
511 {
512         return count;
513 }
514
515 #endif                          /* CONFIG_PPC_PSERIES */
516
517 static int lparcfg_data(struct seq_file *m, void *v)
518 {
519         struct device_node *rootdn;
520         const char *model = "";
521         const char *system_id = "";
522         const char *tmp;
523         unsigned int *lp_index_ptr, lp_index = 0;
524
525         seq_printf(m, "%s %s \n", MODULE_NAME, MODULE_VERS);
526
527         rootdn = find_path_device("/");
528         if (rootdn) {
529                 tmp = get_property(rootdn, "model", NULL);
530                 if (tmp) {
531                         model = tmp;
532                         /* Skip "IBM," - see platforms/iseries/dt.c */
533                         if (firmware_has_feature(FW_FEATURE_ISERIES))
534                                 model += 4;
535                 }
536                 tmp = get_property(rootdn, "system-id", NULL);
537                 if (tmp) {
538                         system_id = tmp;
539                         /* Skip "IBM," - see platforms/iseries/dt.c */
540                         if (firmware_has_feature(FW_FEATURE_ISERIES))
541                                 system_id += 4;
542                 }
543                 lp_index_ptr = (unsigned int *)
544                         get_property(rootdn, "ibm,partition-no", NULL);
545                 if (lp_index_ptr)
546                         lp_index = *lp_index_ptr;
547         }
548         seq_printf(m, "serial_number=%s\n", system_id);
549         seq_printf(m, "system_type=%s\n", model);
550         seq_printf(m, "partition_id=%d\n", (int)lp_index);
551
552         if (firmware_has_feature(FW_FEATURE_ISERIES))
553                 return iseries_lparcfg_data(m, v);
554         return pseries_lparcfg_data(m, v);
555 }
556
557 static int lparcfg_open(struct inode *inode, struct file *file)
558 {
559         return single_open(file, lparcfg_data, NULL);
560 }
561
562 struct file_operations lparcfg_fops = {
563         .owner          = THIS_MODULE,
564         .read           = seq_read,
565         .open           = lparcfg_open,
566         .release        = single_release,
567 };
568
569 int __init lparcfg_init(void)
570 {
571         struct proc_dir_entry *ent;
572         mode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
573
574         /* Allow writing if we have FW_FEATURE_SPLPAR */
575         if (firmware_has_feature(FW_FEATURE_SPLPAR) &&
576                         !firmware_has_feature(FW_FEATURE_ISERIES)) {
577                 lparcfg_fops.write = lparcfg_write;
578                 mode |= S_IWUSR;
579         }
580
581         ent = create_proc_entry("ppc64/lparcfg", mode, NULL);
582         if (ent) {
583                 ent->proc_fops = &lparcfg_fops;
584                 ent->data = kmalloc(LPARCFG_BUFF_SIZE, GFP_KERNEL);
585                 if (!ent->data) {
586                         printk(KERN_ERR
587                                "Failed to allocate buffer for lparcfg\n");
588                         remove_proc_entry("lparcfg", ent->parent);
589                         return -ENOMEM;
590                 }
591         } else {
592                 printk(KERN_ERR "Failed to create ppc64/lparcfg\n");
593                 return -EIO;
594         }
595
596         proc_ppc64_lparcfg = ent;
597         return 0;
598 }
599
600 void __exit lparcfg_cleanup(void)
601 {
602         if (proc_ppc64_lparcfg) {
603                 kfree(proc_ppc64_lparcfg->data);
604                 remove_proc_entry("lparcfg", proc_ppc64_lparcfg->parent);
605         }
606 }
607
608 module_init(lparcfg_init);
609 module_exit(lparcfg_cleanup);
610 MODULE_DESCRIPTION("Interface for LPAR configuration data");
611 MODULE_AUTHOR("Dave Engebretsen");
612 MODULE_LICENSE("GPL");