[PATCH] ppc64: Fix compile warnings in arch/ppc64/kernel/lparcfg.c
[linux-2.6.git] / arch / ppc64 / 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/HvLpConfig.h>
30 #include <asm/lppaca.h>
31 #include <asm/hvcall.h>
32 #include <asm/cputable.h>
33 #include <asm/rtas.h>
34 #include <asm/system.h>
35 #include <asm/time.h>
36 #include <asm/iSeries/ItExtVpdPanel.h>
37 #include <asm/prom.h>
38
39 #define MODULE_VERS "1.6"
40 #define MODULE_NAME "lparcfg"
41
42 /* #define LPARCFG_DEBUG */
43
44 /* find a better place for this function... */
45 void log_plpar_hcall_return(unsigned long rc, char *tag)
46 {
47         if (rc == 0)            /* success, return */
48                 return;
49 /* check for null tag ? */
50         if (rc == H_Hardware)
51                 printk(KERN_INFO
52                        "plpar-hcall (%s) failed with hardware fault\n", tag);
53         else if (rc == H_Function)
54                 printk(KERN_INFO
55                        "plpar-hcall (%s) failed; function not allowed\n", tag);
56         else if (rc == H_Authority)
57                 printk(KERN_INFO
58                        "plpar-hcall (%s) failed; not authorized to this function\n",
59                        tag);
60         else if (rc == H_Parameter)
61                 printk(KERN_INFO "plpar-hcall (%s) failed; Bad parameter(s)\n",
62                        tag);
63         else
64                 printk(KERN_INFO
65                        "plpar-hcall (%s) failed with unexpected rc(0x%lx)\n",
66                        tag, rc);
67
68 }
69
70 static struct proc_dir_entry *proc_ppc64_lparcfg;
71 #define LPARCFG_BUFF_SIZE 4096
72
73 #ifdef CONFIG_PPC_ISERIES
74
75 /*
76  * For iSeries legacy systems, the PPA purr function is available from the
77  * emulated_time_base field in the paca.
78  */
79 static unsigned long get_purr(void)
80 {
81         unsigned long sum_purr = 0;
82         int cpu;
83         struct paca_struct *lpaca;
84
85         for_each_cpu(cpu) {
86                 lpaca = paca + cpu;
87                 sum_purr += lpaca->lppaca.emulated_time_base;
88
89 #ifdef PURR_DEBUG
90                 printk(KERN_INFO "get_purr for cpu (%d) has value (%ld) \n",
91                         cpu, lpaca->lppaca.emulated_time_base);
92 #endif
93         }
94         return sum_purr;
95 }
96
97 #define lparcfg_write NULL
98
99 /* 
100  * Methods used to fetch LPAR data when running on an iSeries platform.
101  */
102 static int lparcfg_data(struct seq_file *m, void *v)
103 {
104         unsigned long pool_id, lp_index;
105         int shared, entitled_capacity, max_entitled_capacity;
106         int processors, max_processors;
107         struct paca_struct *lpaca = get_paca();
108         unsigned long purr = get_purr();
109
110         seq_printf(m, "%s %s \n", MODULE_NAME, MODULE_VERS);
111
112         shared = (int)(lpaca->lppaca_ptr->shared_proc);
113         seq_printf(m, "serial_number=%c%c%c%c%c%c%c\n",
114                    e2a(xItExtVpdPanel.mfgID[2]),
115                    e2a(xItExtVpdPanel.mfgID[3]),
116                    e2a(xItExtVpdPanel.systemSerial[1]),
117                    e2a(xItExtVpdPanel.systemSerial[2]),
118                    e2a(xItExtVpdPanel.systemSerial[3]),
119                    e2a(xItExtVpdPanel.systemSerial[4]),
120                    e2a(xItExtVpdPanel.systemSerial[5]));
121
122         seq_printf(m, "system_type=%c%c%c%c\n",
123                    e2a(xItExtVpdPanel.machineType[0]),
124                    e2a(xItExtVpdPanel.machineType[1]),
125                    e2a(xItExtVpdPanel.machineType[2]),
126                    e2a(xItExtVpdPanel.machineType[3]));
127
128         lp_index = HvLpConfig_getLpIndex();
129         seq_printf(m, "partition_id=%d\n", (int)lp_index);
130
131         seq_printf(m, "system_active_processors=%d\n",
132                    (int)HvLpConfig_getSystemPhysicalProcessors());
133
134         seq_printf(m, "system_potential_processors=%d\n",
135                    (int)HvLpConfig_getSystemPhysicalProcessors());
136
137         processors = (int)HvLpConfig_getPhysicalProcessors();
138         seq_printf(m, "partition_active_processors=%d\n", processors);
139
140         max_processors = (int)HvLpConfig_getMaxPhysicalProcessors();
141         seq_printf(m, "partition_potential_processors=%d\n", max_processors);
142
143         if (shared) {
144                 entitled_capacity = HvLpConfig_getSharedProcUnits();
145                 max_entitled_capacity = HvLpConfig_getMaxSharedProcUnits();
146         } else {
147                 entitled_capacity = processors * 100;
148                 max_entitled_capacity = max_processors * 100;
149         }
150         seq_printf(m, "partition_entitled_capacity=%d\n", entitled_capacity);
151
152         seq_printf(m, "partition_max_entitled_capacity=%d\n",
153                    max_entitled_capacity);
154
155         if (shared) {
156                 pool_id = HvLpConfig_getSharedPoolIndex();
157                 seq_printf(m, "pool=%d\n", (int)pool_id);
158                 seq_printf(m, "pool_capacity=%d\n",
159                            (int)(HvLpConfig_getNumProcsInSharedPool(pool_id) *
160                                  100));
161                 seq_printf(m, "purr=%ld\n", purr);
162         }
163
164         seq_printf(m, "shared_processor_mode=%d\n", shared);
165
166         return 0;
167 }
168 #endif                          /* CONFIG_PPC_ISERIES */
169
170 #ifdef CONFIG_PPC_PSERIES
171 /* 
172  * Methods used to fetch LPAR data when running on a pSeries platform.
173  */
174
175 /*
176  * H_GET_PPP hcall returns info in 4 parms.
177  *  entitled_capacity,unallocated_capacity,
178  *  aggregation, resource_capability).
179  *
180  *  R4 = Entitled Processor Capacity Percentage. 
181  *  R5 = Unallocated Processor Capacity Percentage.
182  *  R6 (AABBCCDDEEFFGGHH).
183  *      XXXX - reserved (0)
184  *          XXXX - reserved (0)
185  *              XXXX - Group Number
186  *                  XXXX - Pool Number.
187  *  R7 (IIJJKKLLMMNNOOPP).
188  *      XX - reserved. (0)
189  *        XX - bit 0-6 reserved (0).   bit 7 is Capped indicator.
190  *          XX - variable processor Capacity Weight
191  *            XX - Unallocated Variable Processor Capacity Weight.
192  *              XXXX - Active processors in Physical Processor Pool.
193  *                  XXXX  - Processors active on platform. 
194  */
195 static unsigned int h_get_ppp(unsigned long *entitled,
196                               unsigned long *unallocated,
197                               unsigned long *aggregation,
198                               unsigned long *resource)
199 {
200         unsigned long rc;
201         rc = plpar_hcall_4out(H_GET_PPP, 0, 0, 0, 0, entitled, unallocated,
202                               aggregation, resource);
203
204         log_plpar_hcall_return(rc, "H_GET_PPP");
205
206         return rc;
207 }
208
209 static void h_pic(unsigned long *pool_idle_time, unsigned long *num_procs)
210 {
211         unsigned long rc;
212         unsigned long dummy;
213         rc = plpar_hcall(H_PIC, 0, 0, 0, 0, pool_idle_time, num_procs, &dummy);
214
215         log_plpar_hcall_return(rc, "H_PIC");
216 }
217
218 static unsigned long get_purr(void);
219
220 /* Track sum of all purrs across all processors. This is used to further */
221 /* calculate usage values by different applications                       */
222
223 static unsigned long get_purr(void)
224 {
225         unsigned long sum_purr = 0;
226         int cpu;
227         struct cpu_usage *cu;
228
229         for_each_cpu(cpu) {
230                 cu = &per_cpu(cpu_usage_array, cpu);
231                 sum_purr += cu->current_tb;
232         }
233         return sum_purr;
234 }
235
236 #define SPLPAR_CHARACTERISTICS_TOKEN 20
237 #define SPLPAR_MAXLENGTH 1026*(sizeof(char))
238
239 /*
240  * parse_system_parameter_string()
241  * Retrieve the potential_processors, max_entitled_capacity and friends
242  * through the get-system-parameter rtas call.  Replace keyword strings as
243  * necessary.
244  */
245 static void parse_system_parameter_string(struct seq_file *m)
246 {
247         int call_status;
248
249         char *local_buffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
250         if (!local_buffer) {
251                 printk(KERN_ERR "%s %s kmalloc failure at line %d \n",
252                        __FILE__, __FUNCTION__, __LINE__);
253                 return;
254         }
255
256         spin_lock(&rtas_data_buf_lock);
257         memset(rtas_data_buf, 0, SPLPAR_MAXLENGTH);
258         call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
259                                 NULL,
260                                 SPLPAR_CHARACTERISTICS_TOKEN,
261                                 __pa(rtas_data_buf));
262         memcpy(local_buffer, rtas_data_buf, SPLPAR_MAXLENGTH);
263         spin_unlock(&rtas_data_buf_lock);
264
265         if (call_status != 0) {
266                 printk(KERN_INFO
267                        "%s %s Error calling get-system-parameter (0x%x)\n",
268                        __FILE__, __FUNCTION__, call_status);
269         } else {
270                 int splpar_strlen;
271                 int idx, w_idx;
272                 char *workbuffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
273                 if (!workbuffer) {
274                         printk(KERN_ERR "%s %s kmalloc failure at line %d \n",
275                                __FILE__, __FUNCTION__, __LINE__);
276                         return;
277                 }
278 #ifdef LPARCFG_DEBUG
279                 printk(KERN_INFO "success calling get-system-parameter \n");
280 #endif
281                 splpar_strlen = local_buffer[0] * 16 + local_buffer[1];
282                 local_buffer += 2;      /* step over strlen value */
283
284                 memset(workbuffer, 0, SPLPAR_MAXLENGTH);
285                 w_idx = 0;
286                 idx = 0;
287                 while ((*local_buffer) && (idx < splpar_strlen)) {
288                         workbuffer[w_idx++] = local_buffer[idx++];
289                         if ((local_buffer[idx] == ',')
290                             || (local_buffer[idx] == '\0')) {
291                                 workbuffer[w_idx] = '\0';
292                                 if (w_idx) {
293                                         /* avoid the empty string */
294                                         seq_printf(m, "%s\n", workbuffer);
295                                 }
296                                 memset(workbuffer, 0, SPLPAR_MAXLENGTH);
297                                 idx++;  /* skip the comma */
298                                 w_idx = 0;
299                         } else if (local_buffer[idx] == '=') {
300                                 /* code here to replace workbuffer contents
301                                    with different keyword strings */
302                                 if (0 == strcmp(workbuffer, "MaxEntCap")) {
303                                         strcpy(workbuffer,
304                                                "partition_max_entitled_capacity");
305                                         w_idx = strlen(workbuffer);
306                                 }
307                                 if (0 == strcmp(workbuffer, "MaxPlatProcs")) {
308                                         strcpy(workbuffer,
309                                                "system_potential_processors");
310                                         w_idx = strlen(workbuffer);
311                                 }
312                         }
313                 }
314                 kfree(workbuffer);
315                 local_buffer -= 2;      /* back up over strlen value */
316         }
317         kfree(local_buffer);
318 }
319
320 static int lparcfg_count_active_processors(void);
321
322 /* Return the number of processors in the system.
323  * This function reads through the device tree and counts
324  * the virtual processors, this does not include threads.
325  */
326 static int lparcfg_count_active_processors(void)
327 {
328         struct device_node *cpus_dn = NULL;
329         int count = 0;
330
331         while ((cpus_dn = of_find_node_by_type(cpus_dn, "cpu"))) {
332 #ifdef LPARCFG_DEBUG
333                 printk(KERN_ERR "cpus_dn %p \n", cpus_dn);
334 #endif
335                 count++;
336         }
337         return count;
338 }
339
340 static int lparcfg_data(struct seq_file *m, void *v)
341 {
342         int partition_potential_processors;
343         int partition_active_processors;
344         struct device_node *rootdn;
345         const char *model = "";
346         const char *system_id = "";
347         unsigned int *lp_index_ptr, lp_index = 0;
348         struct device_node *rtas_node;
349         int *lrdrp;
350
351         rootdn = find_path_device("/");
352         if (rootdn) {
353                 model = get_property(rootdn, "model", NULL);
354                 system_id = get_property(rootdn, "system-id", NULL);
355                 lp_index_ptr = (unsigned int *)
356                     get_property(rootdn, "ibm,partition-no", NULL);
357                 if (lp_index_ptr)
358                         lp_index = *lp_index_ptr;
359         }
360
361         seq_printf(m, "%s %s \n", MODULE_NAME, MODULE_VERS);
362
363         seq_printf(m, "serial_number=%s\n", system_id);
364
365         seq_printf(m, "system_type=%s\n", model);
366
367         seq_printf(m, "partition_id=%d\n", (int)lp_index);
368
369         rtas_node = find_path_device("/rtas");
370         lrdrp = (int *)get_property(rtas_node, "ibm,lrdr-capacity", NULL);
371
372         if (lrdrp == NULL) {
373                 partition_potential_processors = systemcfg->processorCount;
374         } else {
375                 partition_potential_processors = *(lrdrp + 4);
376         }
377
378         partition_active_processors = lparcfg_count_active_processors();
379
380         if (cur_cpu_spec->firmware_features & FW_FEATURE_SPLPAR) {
381                 unsigned long h_entitled, h_unallocated;
382                 unsigned long h_aggregation, h_resource;
383                 unsigned long pool_idle_time, pool_procs;
384                 unsigned long purr;
385
386                 h_get_ppp(&h_entitled, &h_unallocated, &h_aggregation,
387                           &h_resource);
388
389                 seq_printf(m, "R4=0x%lx\n", h_entitled);
390                 seq_printf(m, "R5=0x%lx\n", h_unallocated);
391                 seq_printf(m, "R6=0x%lx\n", h_aggregation);
392                 seq_printf(m, "R7=0x%lx\n", h_resource);
393
394                 purr = get_purr();
395
396                 /* this call handles the ibm,get-system-parameter contents */
397                 parse_system_parameter_string(m);
398
399                 seq_printf(m, "partition_entitled_capacity=%ld\n", h_entitled);
400
401                 seq_printf(m, "group=%ld\n", (h_aggregation >> 2 * 8) & 0xffff);
402
403                 seq_printf(m, "system_active_processors=%ld\n",
404                            (h_resource >> 0 * 8) & 0xffff);
405
406                 /* pool related entries are apropriate for shared configs */
407                 if (paca[0].lppaca.shared_proc) {
408
409                         h_pic(&pool_idle_time, &pool_procs);
410
411                         seq_printf(m, "pool=%ld\n",
412                                    (h_aggregation >> 0 * 8) & 0xffff);
413
414                         /* report pool_capacity in percentage */
415                         seq_printf(m, "pool_capacity=%ld\n",
416                                    ((h_resource >> 2 * 8) & 0xffff) * 100);
417
418                         seq_printf(m, "pool_idle_time=%ld\n", pool_idle_time);
419
420                         seq_printf(m, "pool_num_procs=%ld\n", pool_procs);
421                 }
422
423                 seq_printf(m, "unallocated_capacity_weight=%ld\n",
424                            (h_resource >> 4 * 8) & 0xFF);
425
426                 seq_printf(m, "capacity_weight=%ld\n",
427                            (h_resource >> 5 * 8) & 0xFF);
428
429                 seq_printf(m, "capped=%ld\n", (h_resource >> 6 * 8) & 0x01);
430
431                 seq_printf(m, "unallocated_capacity=%ld\n", h_unallocated);
432
433                 seq_printf(m, "purr=%ld\n", purr);
434
435         } else {                /* non SPLPAR case */
436
437                 seq_printf(m, "system_active_processors=%d\n",
438                            partition_potential_processors);
439
440                 seq_printf(m, "system_potential_processors=%d\n",
441                            partition_potential_processors);
442
443                 seq_printf(m, "partition_max_entitled_capacity=%d\n",
444                            partition_potential_processors * 100);
445
446                 seq_printf(m, "partition_entitled_capacity=%d\n",
447                            partition_active_processors * 100);
448         }
449
450         seq_printf(m, "partition_active_processors=%d\n",
451                    partition_active_processors);
452
453         seq_printf(m, "partition_potential_processors=%d\n",
454                    partition_potential_processors);
455
456         seq_printf(m, "shared_processor_mode=%d\n", paca[0].lppaca.shared_proc);
457
458         return 0;
459 }
460
461 /*
462  * Interface for changing system parameters (variable capacity weight
463  * and entitled capacity).  Format of input is "param_name=value";
464  * anything after value is ignored.  Valid parameters at this time are
465  * "partition_entitled_capacity" and "capacity_weight".  We use
466  * H_SET_PPP to alter parameters.
467  *
468  * This function should be invoked only on systems with
469  * FW_FEATURE_SPLPAR.
470  */
471 static ssize_t lparcfg_write(struct file *file, const char __user * buf,
472                              size_t count, loff_t * off)
473 {
474         char *kbuf;
475         char *tmp;
476         u64 new_entitled, *new_entitled_ptr = &new_entitled;
477         u8 new_weight, *new_weight_ptr = &new_weight;
478
479         unsigned long current_entitled; /* parameters for h_get_ppp */
480         unsigned long dummy;
481         unsigned long resource;
482         u8 current_weight;
483
484         ssize_t retval = -ENOMEM;
485
486         kbuf = kmalloc(count, GFP_KERNEL);
487         if (!kbuf)
488                 goto out;
489
490         retval = -EFAULT;
491         if (copy_from_user(kbuf, buf, count))
492                 goto out;
493
494         retval = -EINVAL;
495         kbuf[count - 1] = '\0';
496         tmp = strchr(kbuf, '=');
497         if (!tmp)
498                 goto out;
499
500         *tmp++ = '\0';
501
502         if (!strcmp(kbuf, "partition_entitled_capacity")) {
503                 char *endp;
504                 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
505                 if (endp == tmp)
506                         goto out;
507                 new_weight_ptr = &current_weight;
508         } else if (!strcmp(kbuf, "capacity_weight")) {
509                 char *endp;
510                 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
511                 if (endp == tmp)
512                         goto out;
513                 new_entitled_ptr = &current_entitled;
514         } else
515                 goto out;
516
517         /* Get our current parameters */
518         retval = h_get_ppp(&current_entitled, &dummy, &dummy, &resource);
519         if (retval) {
520                 retval = -EIO;
521                 goto out;
522         }
523
524         current_weight = (resource >> 5 * 8) & 0xFF;
525
526         pr_debug("%s: current_entitled = %lu, current_weight = %lu\n",
527                  __FUNCTION__, current_entitled, current_weight);
528
529         pr_debug("%s: new_entitled = %lu, new_weight = %lu\n",
530                  __FUNCTION__, *new_entitled_ptr, *new_weight_ptr);
531
532         retval = plpar_hcall_norets(H_SET_PPP, *new_entitled_ptr,
533                                     *new_weight_ptr);
534
535         if (retval == H_Success || retval == H_Constrained) {
536                 retval = count;
537         } else if (retval == H_Busy) {
538                 retval = -EBUSY;
539         } else if (retval == H_Hardware) {
540                 retval = -EIO;
541         } else if (retval == H_Parameter) {
542                 retval = -EINVAL;
543         } else {
544                 printk(KERN_WARNING "%s: received unknown hv return code %ld",
545                        __FUNCTION__, retval);
546                 retval = -EIO;
547         }
548
549       out:
550         kfree(kbuf);
551         return retval;
552 }
553
554 #endif                          /* CONFIG_PPC_PSERIES */
555
556 static int lparcfg_open(struct inode *inode, struct file *file)
557 {
558         return single_open(file, lparcfg_data, NULL);
559 }
560
561 struct file_operations lparcfg_fops = {
562       .owner    = THIS_MODULE,
563       .read     = seq_read,
564       .open     = lparcfg_open,
565       .release  = single_release,
566 };
567
568 int __init lparcfg_init(void)
569 {
570         struct proc_dir_entry *ent;
571         mode_t mode = S_IRUSR;
572
573         /* Allow writing if we have FW_FEATURE_SPLPAR */
574         if (cur_cpu_spec->firmware_features & FW_FEATURE_SPLPAR) {
575                 lparcfg_fops.write = lparcfg_write;
576                 mode |= S_IWUSR;
577         }
578
579         ent = create_proc_entry("ppc64/lparcfg", mode, NULL);
580         if (ent) {
581                 ent->proc_fops = &lparcfg_fops;
582                 ent->data = kmalloc(LPARCFG_BUFF_SIZE, GFP_KERNEL);
583                 if (!ent->data) {
584                         printk(KERN_ERR
585                                "Failed to allocate buffer for lparcfg\n");
586                         remove_proc_entry("lparcfg", ent->parent);
587                         return -ENOMEM;
588                 }
589         } else {
590                 printk(KERN_ERR "Failed to create ppc64/lparcfg\n");
591                 return -EIO;
592         }
593
594         proc_ppc64_lparcfg = ent;
595         return 0;
596 }
597
598 void __exit lparcfg_cleanup(void)
599 {
600         if (proc_ppc64_lparcfg) {
601                 if (proc_ppc64_lparcfg->data) {
602                         kfree(proc_ppc64_lparcfg->data);
603                 }
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");