Merge branch 'master' into upstream
[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 /* find a better place for this function... */
134 static void log_plpar_hcall_return(unsigned long rc, char *tag)
135 {
136         if (rc == 0)            /* success, return */
137                 return;
138 /* check for null tag ? */
139         if (rc == H_HARDWARE)
140                 printk(KERN_INFO
141                        "plpar-hcall (%s) failed with hardware fault\n", tag);
142         else if (rc == H_FUNCTION)
143                 printk(KERN_INFO
144                        "plpar-hcall (%s) failed; function not allowed\n", tag);
145         else if (rc == H_AUTHORITY)
146                 printk(KERN_INFO
147                        "plpar-hcall (%s) failed; not authorized to this"
148                        " function\n", tag);
149         else if (rc == H_PARAMETER)
150                 printk(KERN_INFO "plpar-hcall (%s) failed; Bad parameter(s)\n",
151                        tag);
152         else
153                 printk(KERN_INFO
154                        "plpar-hcall (%s) failed with unexpected rc(0x%lx)\n",
155                        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__, __FUNCTION__, __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__, __FUNCTION__, call_status);
247         } else {
248                 int splpar_strlen;
249                 int idx, w_idx;
250                 char *workbuffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
251                 if (!workbuffer) {
252                         printk(KERN_ERR "%s %s kmalloc failure at line %d \n",
253                                __FILE__, __FUNCTION__, __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                 memset(workbuffer, 0, SPLPAR_MAXLENGTH);
264                 w_idx = 0;
265                 idx = 0;
266                 while ((*local_buffer) && (idx < splpar_strlen)) {
267                         workbuffer[w_idx++] = local_buffer[idx++];
268                         if ((local_buffer[idx] == ',')
269                             || (local_buffer[idx] == '\0')) {
270                                 workbuffer[w_idx] = '\0';
271                                 if (w_idx) {
272                                         /* avoid the empty string */
273                                         seq_printf(m, "%s\n", workbuffer);
274                                 }
275                                 memset(workbuffer, 0, SPLPAR_MAXLENGTH);
276                                 idx++;  /* skip the comma */
277                                 w_idx = 0;
278                         } else if (local_buffer[idx] == '=') {
279                                 /* code here to replace workbuffer contents
280                                    with different keyword strings */
281                                 if (0 == strcmp(workbuffer, "MaxEntCap")) {
282                                         strcpy(workbuffer,
283                                                "partition_max_entitled_capacity");
284                                         w_idx = strlen(workbuffer);
285                                 }
286                                 if (0 == strcmp(workbuffer, "MaxPlatProcs")) {
287                                         strcpy(workbuffer,
288                                                "system_potential_processors");
289                                         w_idx = strlen(workbuffer);
290                                 }
291                         }
292                 }
293                 kfree(workbuffer);
294                 local_buffer -= 2;      /* back up over strlen value */
295         }
296         kfree(local_buffer);
297 }
298
299 /* Return the number of processors in the system.
300  * This function reads through the device tree and counts
301  * the virtual processors, this does not include threads.
302  */
303 static int lparcfg_count_active_processors(void)
304 {
305         struct device_node *cpus_dn = NULL;
306         int count = 0;
307
308         while ((cpus_dn = of_find_node_by_type(cpus_dn, "cpu"))) {
309 #ifdef LPARCFG_DEBUG
310                 printk(KERN_ERR "cpus_dn %p \n", cpus_dn);
311 #endif
312                 count++;
313         }
314         return count;
315 }
316
317 static int pseries_lparcfg_data(struct seq_file *m, void *v)
318 {
319         int partition_potential_processors;
320         int partition_active_processors;
321         struct device_node *rtas_node;
322         const int *lrdrp = NULL;
323
324         rtas_node = find_path_device("/rtas");
325         if (rtas_node)
326                 lrdrp = get_property(rtas_node, "ibm,lrdr-capacity", NULL);
327
328         if (lrdrp == NULL) {
329                 partition_potential_processors = vdso_data->processorCount;
330         } else {
331                 partition_potential_processors = *(lrdrp + 4);
332         }
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         kbuf = kmalloc(count, GFP_KERNEL);
443         if (!kbuf)
444                 goto out;
445
446         retval = -EFAULT;
447         if (copy_from_user(kbuf, buf, count))
448                 goto out;
449
450         retval = -EINVAL;
451         kbuf[count - 1] = '\0';
452         tmp = strchr(kbuf, '=');
453         if (!tmp)
454                 goto out;
455
456         *tmp++ = '\0';
457
458         if (!strcmp(kbuf, "partition_entitled_capacity")) {
459                 char *endp;
460                 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
461                 if (endp == tmp)
462                         goto out;
463                 new_weight_ptr = &current_weight;
464         } else if (!strcmp(kbuf, "capacity_weight")) {
465                 char *endp;
466                 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
467                 if (endp == tmp)
468                         goto out;
469                 new_entitled_ptr = &current_entitled;
470         } else
471                 goto out;
472
473         /* Get our current parameters */
474         retval = h_get_ppp(&current_entitled, &dummy, &dummy, &resource);
475         if (retval) {
476                 retval = -EIO;
477                 goto out;
478         }
479
480         current_weight = (resource >> 5 * 8) & 0xFF;
481
482         pr_debug("%s: current_entitled = %lu, current_weight = %u\n",
483                  __FUNCTION__, current_entitled, current_weight);
484
485         pr_debug("%s: new_entitled = %lu, new_weight = %u\n",
486                  __FUNCTION__, *new_entitled_ptr, *new_weight_ptr);
487
488         retval = plpar_hcall_norets(H_SET_PPP, *new_entitled_ptr,
489                                     *new_weight_ptr);
490
491         if (retval == H_SUCCESS || retval == H_CONSTRAINED) {
492                 retval = count;
493         } else if (retval == H_BUSY) {
494                 retval = -EBUSY;
495         } else if (retval == H_HARDWARE) {
496                 retval = -EIO;
497         } else if (retval == H_PARAMETER) {
498                 retval = -EINVAL;
499         } else {
500                 printk(KERN_WARNING "%s: received unknown hv return code %ld",
501                        __FUNCTION__, retval);
502                 retval = -EIO;
503         }
504
505 out:
506         kfree(kbuf);
507         return retval;
508 }
509
510 #else                           /* CONFIG_PPC_PSERIES */
511
512 static int pseries_lparcfg_data(struct seq_file *m, void *v)
513 {
514         return 0;
515 }
516
517 static ssize_t lparcfg_write(struct file *file, const char __user * buf,
518                              size_t count, loff_t * off)
519 {
520         return count;
521 }
522
523 #endif                          /* CONFIG_PPC_PSERIES */
524
525 static int lparcfg_data(struct seq_file *m, void *v)
526 {
527         struct device_node *rootdn;
528         const char *model = "";
529         const char *system_id = "";
530         const char *tmp;
531         const unsigned int *lp_index_ptr;
532         unsigned int lp_index = 0;
533
534         seq_printf(m, "%s %s \n", MODULE_NAME, MODULE_VERS);
535
536         rootdn = find_path_device("/");
537         if (rootdn) {
538                 tmp = get_property(rootdn, "model", NULL);
539                 if (tmp) {
540                         model = tmp;
541                         /* Skip "IBM," - see platforms/iseries/dt.c */
542                         if (firmware_has_feature(FW_FEATURE_ISERIES))
543                                 model += 4;
544                 }
545                 tmp = get_property(rootdn, "system-id", NULL);
546                 if (tmp) {
547                         system_id = tmp;
548                         /* Skip "IBM," - see platforms/iseries/dt.c */
549                         if (firmware_has_feature(FW_FEATURE_ISERIES))
550                                 system_id += 4;
551                 }
552                 lp_index_ptr = get_property(rootdn, "ibm,partition-no", NULL);
553                 if (lp_index_ptr)
554                         lp_index = *lp_index_ptr;
555         }
556         seq_printf(m, "serial_number=%s\n", system_id);
557         seq_printf(m, "system_type=%s\n", model);
558         seq_printf(m, "partition_id=%d\n", (int)lp_index);
559
560         if (firmware_has_feature(FW_FEATURE_ISERIES))
561                 return iseries_lparcfg_data(m, v);
562         return pseries_lparcfg_data(m, v);
563 }
564
565 static int lparcfg_open(struct inode *inode, struct file *file)
566 {
567         return single_open(file, lparcfg_data, NULL);
568 }
569
570 struct file_operations lparcfg_fops = {
571         .owner          = THIS_MODULE,
572         .read           = seq_read,
573         .open           = lparcfg_open,
574         .release        = single_release,
575 };
576
577 int __init lparcfg_init(void)
578 {
579         struct proc_dir_entry *ent;
580         mode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
581
582         /* Allow writing if we have FW_FEATURE_SPLPAR */
583         if (firmware_has_feature(FW_FEATURE_SPLPAR) &&
584                         !firmware_has_feature(FW_FEATURE_ISERIES)) {
585                 lparcfg_fops.write = lparcfg_write;
586                 mode |= S_IWUSR;
587         }
588
589         ent = create_proc_entry("ppc64/lparcfg", mode, NULL);
590         if (ent) {
591                 ent->proc_fops = &lparcfg_fops;
592                 ent->data = kmalloc(LPARCFG_BUFF_SIZE, GFP_KERNEL);
593                 if (!ent->data) {
594                         printk(KERN_ERR
595                                "Failed to allocate buffer for lparcfg\n");
596                         remove_proc_entry("lparcfg", ent->parent);
597                         return -ENOMEM;
598                 }
599         } else {
600                 printk(KERN_ERR "Failed to create ppc64/lparcfg\n");
601                 return -EIO;
602         }
603
604         proc_ppc64_lparcfg = ent;
605         return 0;
606 }
607
608 void __exit lparcfg_cleanup(void)
609 {
610         if (proc_ppc64_lparcfg) {
611                 kfree(proc_ppc64_lparcfg->data);
612                 remove_proc_entry("lparcfg", proc_ppc64_lparcfg->parent);
613         }
614 }
615
616 module_init(lparcfg_init);
617 module_exit(lparcfg_cleanup);
618 MODULE_DESCRIPTION("Interface for LPAR configuration data");
619 MODULE_AUTHOR("Dave Engebretsen");
620 MODULE_LICENSE("GPL");