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