Merge master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-misc-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 #define LPARCFG_BUFF_SIZE 4096
45
46 /*
47  * Track sum of all purrs across all processors. This is used to further
48  * calculate usage values by different applications
49  */
50 static unsigned long get_purr(void)
51 {
52         unsigned long sum_purr = 0;
53         int cpu;
54
55         for_each_possible_cpu(cpu) {
56                 if (firmware_has_feature(FW_FEATURE_ISERIES))
57                         sum_purr += lppaca[cpu].emulated_time_base;
58                 else {
59                         struct cpu_usage *cu;
60
61                         cu = &per_cpu(cpu_usage_array, cpu);
62                         sum_purr += cu->current_tb;
63                 }
64         }
65         return sum_purr;
66 }
67
68 #ifdef CONFIG_PPC_ISERIES
69
70 /*
71  * Methods used to fetch LPAR data when running on an iSeries platform.
72  */
73 static int iseries_lparcfg_data(struct seq_file *m, void *v)
74 {
75         unsigned long pool_id;
76         int shared, entitled_capacity, max_entitled_capacity;
77         int processors, max_processors;
78         unsigned long purr = get_purr();
79
80         shared = (int)(get_lppaca()->shared_proc);
81
82         seq_printf(m, "system_active_processors=%d\n",
83                    (int)HvLpConfig_getSystemPhysicalProcessors());
84
85         seq_printf(m, "system_potential_processors=%d\n",
86                    (int)HvLpConfig_getSystemPhysicalProcessors());
87
88         processors = (int)HvLpConfig_getPhysicalProcessors();
89         seq_printf(m, "partition_active_processors=%d\n", processors);
90
91         max_processors = (int)HvLpConfig_getMaxPhysicalProcessors();
92         seq_printf(m, "partition_potential_processors=%d\n", max_processors);
93
94         if (shared) {
95                 entitled_capacity = HvLpConfig_getSharedProcUnits();
96                 max_entitled_capacity = HvLpConfig_getMaxSharedProcUnits();
97         } else {
98                 entitled_capacity = processors * 100;
99                 max_entitled_capacity = max_processors * 100;
100         }
101         seq_printf(m, "partition_entitled_capacity=%d\n", entitled_capacity);
102
103         seq_printf(m, "partition_max_entitled_capacity=%d\n",
104                    max_entitled_capacity);
105
106         if (shared) {
107                 pool_id = HvLpConfig_getSharedPoolIndex();
108                 seq_printf(m, "pool=%d\n", (int)pool_id);
109                 seq_printf(m, "pool_capacity=%d\n",
110                            (int)(HvLpConfig_getNumProcsInSharedPool(pool_id) *
111                                  100));
112                 seq_printf(m, "purr=%ld\n", purr);
113         }
114
115         seq_printf(m, "shared_processor_mode=%d\n", shared);
116
117         return 0;
118 }
119
120 #else                           /* CONFIG_PPC_ISERIES */
121
122 static int iseries_lparcfg_data(struct seq_file *m, void *v)
123 {
124         return 0;
125 }
126
127 #endif                          /* CONFIG_PPC_ISERIES */
128
129 #ifdef CONFIG_PPC_PSERIES
130 /*
131  * Methods used to fetch LPAR data when running on a pSeries platform.
132  */
133 static void log_plpar_hcall_return(unsigned long rc, char *tag)
134 {
135         switch(rc) {
136         case 0:
137                 return;
138         case H_HARDWARE:
139                 printk(KERN_INFO "plpar-hcall (%s) "
140                                 "Hardware fault\n", tag);
141                 return;
142         case H_FUNCTION:
143                 printk(KERN_INFO "plpar-hcall (%s) "
144                                 "Function not allowed\n", tag);
145                 return;
146         case H_AUTHORITY:
147                 printk(KERN_INFO "plpar-hcall (%s) "
148                                 "Not authorized to this function\n", tag);
149                 return;
150         case H_PARAMETER:
151                 printk(KERN_INFO "plpar-hcall (%s) "
152                                 "Bad parameter(s)\n",tag);
153                 return;
154         default:
155                 printk(KERN_INFO "plpar-hcall (%s) "
156                                 "Unexpected rc(0x%lx)\n", 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         unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
187
188         rc = plpar_hcall(H_GET_PPP, retbuf);
189
190         *entitled = retbuf[0];
191         *unallocated = retbuf[1];
192         *aggregation = retbuf[2];
193         *resource = retbuf[3];
194
195         log_plpar_hcall_return(rc, "H_GET_PPP");
196
197         return rc;
198 }
199
200 static void h_pic(unsigned long *pool_idle_time, unsigned long *num_procs)
201 {
202         unsigned long rc;
203         unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
204
205         rc = plpar_hcall(H_PIC, retbuf);
206
207         *pool_idle_time = retbuf[0];
208         *num_procs = retbuf[1];
209
210         if (rc != H_AUTHORITY)
211                 log_plpar_hcall_return(rc, "H_PIC");
212 }
213
214 #define SPLPAR_CHARACTERISTICS_TOKEN 20
215 #define SPLPAR_MAXLENGTH 1026*(sizeof(char))
216
217 /*
218  * parse_system_parameter_string()
219  * Retrieve the potential_processors, max_entitled_capacity and friends
220  * through the get-system-parameter rtas call.  Replace keyword strings as
221  * necessary.
222  */
223 static void parse_system_parameter_string(struct seq_file *m)
224 {
225         int call_status;
226
227         unsigned char *local_buffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
228         if (!local_buffer) {
229                 printk(KERN_ERR "%s %s kmalloc failure at line %d \n",
230                        __FILE__, __FUNCTION__, __LINE__);
231                 return;
232         }
233
234         spin_lock(&rtas_data_buf_lock);
235         memset(rtas_data_buf, 0, SPLPAR_MAXLENGTH);
236         call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
237                                 NULL,
238                                 SPLPAR_CHARACTERISTICS_TOKEN,
239                                 __pa(rtas_data_buf),
240                                 RTAS_DATA_BUF_SIZE);
241         memcpy(local_buffer, rtas_data_buf, SPLPAR_MAXLENGTH);
242         spin_unlock(&rtas_data_buf_lock);
243
244         if (call_status != 0) {
245                 printk(KERN_INFO
246                        "%s %s Error calling get-system-parameter (0x%x)\n",
247                        __FILE__, __FUNCTION__, call_status);
248         } else {
249                 int splpar_strlen;
250                 int idx, w_idx;
251                 char *workbuffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
252                 if (!workbuffer) {
253                         printk(KERN_ERR "%s %s kmalloc failure at line %d \n",
254                                __FILE__, __FUNCTION__, __LINE__);
255                         kfree(local_buffer);
256                         return;
257                 }
258 #ifdef LPARCFG_DEBUG
259                 printk(KERN_INFO "success calling get-system-parameter \n");
260 #endif
261                 splpar_strlen = local_buffer[0] * 256 + local_buffer[1];
262                 local_buffer += 2;      /* step over strlen value */
263
264                 memset(workbuffer, 0, SPLPAR_MAXLENGTH);
265                 w_idx = 0;
266                 idx = 0;
267                 while ((*local_buffer) && (idx < splpar_strlen)) {
268                         workbuffer[w_idx++] = local_buffer[idx++];
269                         if ((local_buffer[idx] == ',')
270                             || (local_buffer[idx] == '\0')) {
271                                 workbuffer[w_idx] = '\0';
272                                 if (w_idx) {
273                                         /* avoid the empty string */
274                                         seq_printf(m, "%s\n", workbuffer);
275                                 }
276                                 memset(workbuffer, 0, SPLPAR_MAXLENGTH);
277                                 idx++;  /* skip the comma */
278                                 w_idx = 0;
279                         } else if (local_buffer[idx] == '=') {
280                                 /* code here to replace workbuffer contents
281                                    with different keyword strings */
282                                 if (0 == strcmp(workbuffer, "MaxEntCap")) {
283                                         strcpy(workbuffer,
284                                                "partition_max_entitled_capacity");
285                                         w_idx = strlen(workbuffer);
286                                 }
287                                 if (0 == strcmp(workbuffer, "MaxPlatProcs")) {
288                                         strcpy(workbuffer,
289                                                "system_potential_processors");
290                                         w_idx = strlen(workbuffer);
291                                 }
292                         }
293                 }
294                 kfree(workbuffer);
295                 local_buffer -= 2;      /* back up over strlen value */
296         }
297         kfree(local_buffer);
298 }
299
300 /* Return the number of processors in the system.
301  * This function reads through the device tree and counts
302  * the virtual processors, this does not include threads.
303  */
304 static int lparcfg_count_active_processors(void)
305 {
306         struct device_node *cpus_dn = NULL;
307         int count = 0;
308
309         while ((cpus_dn = of_find_node_by_type(cpus_dn, "cpu"))) {
310 #ifdef LPARCFG_DEBUG
311                 printk(KERN_ERR "cpus_dn %p \n", cpus_dn);
312 #endif
313                 count++;
314         }
315         return count;
316 }
317
318 static int pseries_lparcfg_data(struct seq_file *m, void *v)
319 {
320         int partition_potential_processors;
321         int partition_active_processors;
322         struct device_node *rtas_node;
323         const int *lrdrp = NULL;
324
325         rtas_node = of_find_node_by_path("/rtas");
326         if (rtas_node)
327                 lrdrp = of_get_property(rtas_node, "ibm,lrdr-capacity", NULL);
328
329         if (lrdrp == NULL) {
330                 partition_potential_processors = vdso_data->processorCount;
331         } else {
332                 partition_potential_processors = *(lrdrp + 4);
333         }
334         of_node_put(rtas_node);
335
336         partition_active_processors = lparcfg_count_active_processors();
337
338         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
339                 unsigned long h_entitled, h_unallocated;
340                 unsigned long h_aggregation, h_resource;
341                 unsigned long pool_idle_time, pool_procs;
342                 unsigned long purr;
343
344                 h_get_ppp(&h_entitled, &h_unallocated, &h_aggregation,
345                           &h_resource);
346
347                 seq_printf(m, "R4=0x%lx\n", h_entitled);
348                 seq_printf(m, "R5=0x%lx\n", h_unallocated);
349                 seq_printf(m, "R6=0x%lx\n", h_aggregation);
350                 seq_printf(m, "R7=0x%lx\n", h_resource);
351
352                 purr = get_purr();
353
354                 /* this call handles the ibm,get-system-parameter contents */
355                 parse_system_parameter_string(m);
356
357                 seq_printf(m, "partition_entitled_capacity=%ld\n", h_entitled);
358
359                 seq_printf(m, "group=%ld\n", (h_aggregation >> 2 * 8) & 0xffff);
360
361                 seq_printf(m, "system_active_processors=%ld\n",
362                            (h_resource >> 0 * 8) & 0xffff);
363
364                 /* pool related entries are apropriate for shared configs */
365                 if (lppaca[0].shared_proc) {
366
367                         h_pic(&pool_idle_time, &pool_procs);
368
369                         seq_printf(m, "pool=%ld\n",
370                                    (h_aggregation >> 0 * 8) & 0xffff);
371
372                         /* report pool_capacity in percentage */
373                         seq_printf(m, "pool_capacity=%ld\n",
374                                    ((h_resource >> 2 * 8) & 0xffff) * 100);
375
376                         seq_printf(m, "pool_idle_time=%ld\n", pool_idle_time);
377
378                         seq_printf(m, "pool_num_procs=%ld\n", pool_procs);
379                 }
380
381                 seq_printf(m, "unallocated_capacity_weight=%ld\n",
382                            (h_resource >> 4 * 8) & 0xFF);
383
384                 seq_printf(m, "capacity_weight=%ld\n",
385                            (h_resource >> 5 * 8) & 0xFF);
386
387                 seq_printf(m, "capped=%ld\n", (h_resource >> 6 * 8) & 0x01);
388
389                 seq_printf(m, "unallocated_capacity=%ld\n", h_unallocated);
390
391                 seq_printf(m, "purr=%ld\n", purr);
392
393         } else {                /* non SPLPAR case */
394
395                 seq_printf(m, "system_active_processors=%d\n",
396                            partition_potential_processors);
397
398                 seq_printf(m, "system_potential_processors=%d\n",
399                            partition_potential_processors);
400
401                 seq_printf(m, "partition_max_entitled_capacity=%d\n",
402                            partition_potential_processors * 100);
403
404                 seq_printf(m, "partition_entitled_capacity=%d\n",
405                            partition_active_processors * 100);
406         }
407
408         seq_printf(m, "partition_active_processors=%d\n",
409                    partition_active_processors);
410
411         seq_printf(m, "partition_potential_processors=%d\n",
412                    partition_potential_processors);
413
414         seq_printf(m, "shared_processor_mode=%d\n", lppaca[0].shared_proc);
415
416         return 0;
417 }
418
419 /*
420  * Interface for changing system parameters (variable capacity weight
421  * and entitled capacity).  Format of input is "param_name=value";
422  * anything after value is ignored.  Valid parameters at this time are
423  * "partition_entitled_capacity" and "capacity_weight".  We use
424  * H_SET_PPP to alter parameters.
425  *
426  * This function should be invoked only on systems with
427  * FW_FEATURE_SPLPAR.
428  */
429 static ssize_t lparcfg_write(struct file *file, const char __user * buf,
430                              size_t count, loff_t * off)
431 {
432         char *kbuf;
433         char *tmp;
434         u64 new_entitled, *new_entitled_ptr = &new_entitled;
435         u8 new_weight, *new_weight_ptr = &new_weight;
436
437         unsigned long current_entitled; /* parameters for h_get_ppp */
438         unsigned long dummy;
439         unsigned long resource;
440         u8 current_weight;
441
442         ssize_t retval = -ENOMEM;
443
444         if (!firmware_has_feature(FW_FEATURE_SPLPAR) ||
445                         firmware_has_feature(FW_FEATURE_ISERIES))
446                 return -EINVAL;
447
448         kbuf = kmalloc(count, GFP_KERNEL);
449         if (!kbuf)
450                 goto out;
451
452         retval = -EFAULT;
453         if (copy_from_user(kbuf, buf, count))
454                 goto out;
455
456         retval = -EINVAL;
457         kbuf[count - 1] = '\0';
458         tmp = strchr(kbuf, '=');
459         if (!tmp)
460                 goto out;
461
462         *tmp++ = '\0';
463
464         if (!strcmp(kbuf, "partition_entitled_capacity")) {
465                 char *endp;
466                 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
467                 if (endp == tmp)
468                         goto out;
469                 new_weight_ptr = &current_weight;
470         } else if (!strcmp(kbuf, "capacity_weight")) {
471                 char *endp;
472                 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
473                 if (endp == tmp)
474                         goto out;
475                 new_entitled_ptr = &current_entitled;
476         } else
477                 goto out;
478
479         /* Get our current parameters */
480         retval = h_get_ppp(&current_entitled, &dummy, &dummy, &resource);
481         if (retval) {
482                 retval = -EIO;
483                 goto out;
484         }
485
486         current_weight = (resource >> 5 * 8) & 0xFF;
487
488         pr_debug("%s: current_entitled = %lu, current_weight = %u\n",
489                  __FUNCTION__, current_entitled, current_weight);
490
491         pr_debug("%s: new_entitled = %lu, new_weight = %u\n",
492                  __FUNCTION__, *new_entitled_ptr, *new_weight_ptr);
493
494         retval = plpar_hcall_norets(H_SET_PPP, *new_entitled_ptr,
495                                     *new_weight_ptr);
496
497         if (retval == H_SUCCESS || retval == H_CONSTRAINED) {
498                 retval = count;
499         } else if (retval == H_BUSY) {
500                 retval = -EBUSY;
501         } else if (retval == H_HARDWARE) {
502                 retval = -EIO;
503         } else if (retval == H_PARAMETER) {
504                 retval = -EINVAL;
505         } else {
506                 printk(KERN_WARNING "%s: received unknown hv return code %ld",
507                        __FUNCTION__, retval);
508                 retval = -EIO;
509         }
510
511 out:
512         kfree(kbuf);
513         return retval;
514 }
515
516 #else                           /* CONFIG_PPC_PSERIES */
517
518 static int pseries_lparcfg_data(struct seq_file *m, void *v)
519 {
520         return 0;
521 }
522
523 static ssize_t lparcfg_write(struct file *file, const char __user * buf,
524                              size_t count, loff_t * off)
525 {
526         return -EINVAL;
527 }
528
529 #endif                          /* CONFIG_PPC_PSERIES */
530
531 static int lparcfg_data(struct seq_file *m, void *v)
532 {
533         struct device_node *rootdn;
534         const char *model = "";
535         const char *system_id = "";
536         const char *tmp;
537         const unsigned int *lp_index_ptr;
538         unsigned int lp_index = 0;
539
540         seq_printf(m, "%s %s \n", MODULE_NAME, MODULE_VERS);
541
542         rootdn = of_find_node_by_path("/");
543         if (rootdn) {
544                 tmp = of_get_property(rootdn, "model", NULL);
545                 if (tmp) {
546                         model = tmp;
547                         /* Skip "IBM," - see platforms/iseries/dt.c */
548                         if (firmware_has_feature(FW_FEATURE_ISERIES))
549                                 model += 4;
550                 }
551                 tmp = of_get_property(rootdn, "system-id", NULL);
552                 if (tmp) {
553                         system_id = tmp;
554                         /* Skip "IBM," - see platforms/iseries/dt.c */
555                         if (firmware_has_feature(FW_FEATURE_ISERIES))
556                                 system_id += 4;
557                 }
558                 lp_index_ptr = of_get_property(rootdn, "ibm,partition-no",
559                                         NULL);
560                 if (lp_index_ptr)
561                         lp_index = *lp_index_ptr;
562                 of_node_put(rootdn);
563         }
564         seq_printf(m, "serial_number=%s\n", system_id);
565         seq_printf(m, "system_type=%s\n", model);
566         seq_printf(m, "partition_id=%d\n", (int)lp_index);
567
568         if (firmware_has_feature(FW_FEATURE_ISERIES))
569                 return iseries_lparcfg_data(m, v);
570         return pseries_lparcfg_data(m, v);
571 }
572
573 static int lparcfg_open(struct inode *inode, struct file *file)
574 {
575         return single_open(file, lparcfg_data, NULL);
576 }
577
578 const struct file_operations lparcfg_fops = {
579         .owner          = THIS_MODULE,
580         .read           = seq_read,
581         .write          = lparcfg_write,
582         .open           = lparcfg_open,
583         .release        = single_release,
584 };
585
586 int __init lparcfg_init(void)
587 {
588         struct proc_dir_entry *ent;
589         mode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
590
591         /* Allow writing if we have FW_FEATURE_SPLPAR */
592         if (firmware_has_feature(FW_FEATURE_SPLPAR) &&
593                         !firmware_has_feature(FW_FEATURE_ISERIES))
594                 mode |= S_IWUSR;
595
596         ent = create_proc_entry("ppc64/lparcfg", mode, NULL);
597         if (ent) {
598                 ent->proc_fops = &lparcfg_fops;
599                 ent->data = kmalloc(LPARCFG_BUFF_SIZE, GFP_KERNEL);
600                 if (!ent->data) {
601                         printk(KERN_ERR
602                                "Failed to allocate buffer for lparcfg\n");
603                         remove_proc_entry("lparcfg", ent->parent);
604                         return -ENOMEM;
605                 }
606         } else {
607                 printk(KERN_ERR "Failed to create ppc64/lparcfg\n");
608                 return -EIO;
609         }
610
611         proc_ppc64_lparcfg = ent;
612         return 0;
613 }
614
615 void __exit lparcfg_cleanup(void)
616 {
617         if (proc_ppc64_lparcfg) {
618                 kfree(proc_ppc64_lparcfg->data);
619                 remove_proc_entry("lparcfg", proc_ppc64_lparcfg->parent);
620         }
621 }
622
623 module_init(lparcfg_init);
624 module_exit(lparcfg_cleanup);
625 MODULE_DESCRIPTION("Interface for LPAR configuration data");
626 MODULE_AUTHOR("Dave Engebretsen");
627 MODULE_LICENSE("GPL");