Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/kaber/nf-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 #include <asm/vio.h>
38
39 #define MODULE_VERS "1.8"
40 #define MODULE_NAME "lparcfg"
41
42 /* #define LPARCFG_DEBUG */
43
44 static struct proc_dir_entry *proc_ppc64_lparcfg;
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)(local_paca->lppaca_ptr->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 /**
134  * h_get_mpp
135  * H_GET_MPP hcall returns info in 7 parms
136  */
137 int h_get_mpp(struct hvcall_mpp_data *mpp_data)
138 {
139         int rc;
140         unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];
141
142         rc = plpar_hcall9(H_GET_MPP, retbuf);
143
144         mpp_data->entitled_mem = retbuf[0];
145         mpp_data->mapped_mem = retbuf[1];
146
147         mpp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff;
148         mpp_data->pool_num = retbuf[2] & 0xffff;
149
150         mpp_data->mem_weight = (retbuf[3] >> 7 * 8) & 0xff;
151         mpp_data->unallocated_mem_weight = (retbuf[3] >> 6 * 8) & 0xff;
152         mpp_data->unallocated_entitlement = retbuf[3] & 0xffffffffffff;
153
154         mpp_data->pool_size = retbuf[4];
155         mpp_data->loan_request = retbuf[5];
156         mpp_data->backing_mem = retbuf[6];
157
158         return rc;
159 }
160 EXPORT_SYMBOL(h_get_mpp);
161
162 struct hvcall_ppp_data {
163         u64     entitlement;
164         u64     unallocated_entitlement;
165         u16     group_num;
166         u16     pool_num;
167         u8      capped;
168         u8      weight;
169         u8      unallocated_weight;
170         u16     active_procs_in_pool;
171         u16     active_system_procs;
172 };
173
174 /*
175  * H_GET_PPP hcall returns info in 4 parms.
176  *  entitled_capacity,unallocated_capacity,
177  *  aggregation, resource_capability).
178  *
179  *  R4 = Entitled Processor Capacity Percentage.
180  *  R5 = Unallocated Processor Capacity Percentage.
181  *  R6 (AABBCCDDEEFFGGHH).
182  *      XXXX - reserved (0)
183  *          XXXX - reserved (0)
184  *              XXXX - Group Number
185  *                  XXXX - Pool Number.
186  *  R7 (IIJJKKLLMMNNOOPP).
187  *      XX - reserved. (0)
188  *        XX - bit 0-6 reserved (0).   bit 7 is Capped indicator.
189  *          XX - variable processor Capacity Weight
190  *            XX - Unallocated Variable Processor Capacity Weight.
191  *              XXXX - Active processors in Physical Processor Pool.
192  *                  XXXX  - Processors active on platform.
193  */
194 static unsigned int h_get_ppp(struct hvcall_ppp_data *ppp_data)
195 {
196         unsigned long rc;
197         unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
198
199         rc = plpar_hcall(H_GET_PPP, retbuf);
200
201         ppp_data->entitlement = retbuf[0];
202         ppp_data->unallocated_entitlement = retbuf[1];
203
204         ppp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff;
205         ppp_data->pool_num = retbuf[2] & 0xffff;
206
207         ppp_data->capped = (retbuf[3] >> 6 * 8) & 0x01;
208         ppp_data->weight = (retbuf[3] >> 5 * 8) & 0xff;
209         ppp_data->unallocated_weight = (retbuf[3] >> 4 * 8) & 0xff;
210         ppp_data->active_procs_in_pool = (retbuf[3] >> 2 * 8) & 0xffff;
211         ppp_data->active_system_procs = retbuf[3] & 0xffff;
212
213         return rc;
214 }
215
216 static unsigned h_pic(unsigned long *pool_idle_time,
217                       unsigned long *num_procs)
218 {
219         unsigned long rc;
220         unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
221
222         rc = plpar_hcall(H_PIC, retbuf);
223
224         *pool_idle_time = retbuf[0];
225         *num_procs = retbuf[1];
226
227         return rc;
228 }
229
230 /*
231  * parse_ppp_data
232  * Parse out the data returned from h_get_ppp and h_pic
233  */
234 static void parse_ppp_data(struct seq_file *m)
235 {
236         struct hvcall_ppp_data ppp_data;
237         int rc;
238
239         rc = h_get_ppp(&ppp_data);
240         if (rc)
241                 return;
242
243         seq_printf(m, "partition_entitled_capacity=%lld\n",
244                    ppp_data.entitlement);
245         seq_printf(m, "group=%d\n", ppp_data.group_num);
246         seq_printf(m, "system_active_processors=%d\n",
247                    ppp_data.active_system_procs);
248
249         /* pool related entries are apropriate for shared configs */
250         if (lppaca[0].shared_proc) {
251                 unsigned long pool_idle_time, pool_procs;
252
253                 seq_printf(m, "pool=%d\n", ppp_data.pool_num);
254
255                 /* report pool_capacity in percentage */
256                 seq_printf(m, "pool_capacity=%d\n",
257                            ppp_data.active_procs_in_pool * 100);
258
259                 h_pic(&pool_idle_time, &pool_procs);
260                 seq_printf(m, "pool_idle_time=%ld\n", pool_idle_time);
261                 seq_printf(m, "pool_num_procs=%ld\n", pool_procs);
262         }
263
264         seq_printf(m, "unallocated_capacity_weight=%d\n",
265                    ppp_data.unallocated_weight);
266         seq_printf(m, "capacity_weight=%d\n", ppp_data.weight);
267         seq_printf(m, "capped=%d\n", ppp_data.capped);
268         seq_printf(m, "unallocated_capacity=%lld\n",
269                    ppp_data.unallocated_entitlement);
270 }
271
272 /**
273  * parse_mpp_data
274  * Parse out data returned from h_get_mpp
275  */
276 static void parse_mpp_data(struct seq_file *m)
277 {
278         struct hvcall_mpp_data mpp_data;
279         int rc;
280
281         rc = h_get_mpp(&mpp_data);
282         if (rc)
283                 return;
284
285         seq_printf(m, "entitled_memory=%ld\n", mpp_data.entitled_mem);
286
287         if (mpp_data.mapped_mem != -1)
288                 seq_printf(m, "mapped_entitled_memory=%ld\n",
289                            mpp_data.mapped_mem);
290
291         seq_printf(m, "entitled_memory_group_number=%d\n", mpp_data.group_num);
292         seq_printf(m, "entitled_memory_pool_number=%d\n", mpp_data.pool_num);
293
294         seq_printf(m, "entitled_memory_weight=%d\n", mpp_data.mem_weight);
295         seq_printf(m, "unallocated_entitled_memory_weight=%d\n",
296                    mpp_data.unallocated_mem_weight);
297         seq_printf(m, "unallocated_io_mapping_entitlement=%ld\n",
298                    mpp_data.unallocated_entitlement);
299
300         if (mpp_data.pool_size != -1)
301                 seq_printf(m, "entitled_memory_pool_size=%ld bytes\n",
302                            mpp_data.pool_size);
303
304         seq_printf(m, "entitled_memory_loan_request=%ld\n",
305                    mpp_data.loan_request);
306
307         seq_printf(m, "backing_memory=%ld bytes\n", mpp_data.backing_mem);
308 }
309
310 #define SPLPAR_CHARACTERISTICS_TOKEN 20
311 #define SPLPAR_MAXLENGTH 1026*(sizeof(char))
312
313 /*
314  * parse_system_parameter_string()
315  * Retrieve the potential_processors, max_entitled_capacity and friends
316  * through the get-system-parameter rtas call.  Replace keyword strings as
317  * necessary.
318  */
319 static void parse_system_parameter_string(struct seq_file *m)
320 {
321         int call_status;
322
323         unsigned char *local_buffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
324         if (!local_buffer) {
325                 printk(KERN_ERR "%s %s kmalloc failure at line %d \n",
326                        __FILE__, __func__, __LINE__);
327                 return;
328         }
329
330         spin_lock(&rtas_data_buf_lock);
331         memset(rtas_data_buf, 0, SPLPAR_MAXLENGTH);
332         call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
333                                 NULL,
334                                 SPLPAR_CHARACTERISTICS_TOKEN,
335                                 __pa(rtas_data_buf),
336                                 RTAS_DATA_BUF_SIZE);
337         memcpy(local_buffer, rtas_data_buf, SPLPAR_MAXLENGTH);
338         spin_unlock(&rtas_data_buf_lock);
339
340         if (call_status != 0) {
341                 printk(KERN_INFO
342                        "%s %s Error calling get-system-parameter (0x%x)\n",
343                        __FILE__, __func__, call_status);
344         } else {
345                 int splpar_strlen;
346                 int idx, w_idx;
347                 char *workbuffer = kzalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
348                 if (!workbuffer) {
349                         printk(KERN_ERR "%s %s kmalloc failure at line %d \n",
350                                __FILE__, __func__, __LINE__);
351                         kfree(local_buffer);
352                         return;
353                 }
354 #ifdef LPARCFG_DEBUG
355                 printk(KERN_INFO "success calling get-system-parameter \n");
356 #endif
357                 splpar_strlen = local_buffer[0] * 256 + local_buffer[1];
358                 local_buffer += 2;      /* step over strlen value */
359
360                 w_idx = 0;
361                 idx = 0;
362                 while ((*local_buffer) && (idx < splpar_strlen)) {
363                         workbuffer[w_idx++] = local_buffer[idx++];
364                         if ((local_buffer[idx] == ',')
365                             || (local_buffer[idx] == '\0')) {
366                                 workbuffer[w_idx] = '\0';
367                                 if (w_idx) {
368                                         /* avoid the empty string */
369                                         seq_printf(m, "%s\n", workbuffer);
370                                 }
371                                 memset(workbuffer, 0, SPLPAR_MAXLENGTH);
372                                 idx++;  /* skip the comma */
373                                 w_idx = 0;
374                         } else if (local_buffer[idx] == '=') {
375                                 /* code here to replace workbuffer contents
376                                    with different keyword strings */
377                                 if (0 == strcmp(workbuffer, "MaxEntCap")) {
378                                         strcpy(workbuffer,
379                                                "partition_max_entitled_capacity");
380                                         w_idx = strlen(workbuffer);
381                                 }
382                                 if (0 == strcmp(workbuffer, "MaxPlatProcs")) {
383                                         strcpy(workbuffer,
384                                                "system_potential_processors");
385                                         w_idx = strlen(workbuffer);
386                                 }
387                         }
388                 }
389                 kfree(workbuffer);
390                 local_buffer -= 2;      /* back up over strlen value */
391         }
392         kfree(local_buffer);
393 }
394
395 /* Return the number of processors in the system.
396  * This function reads through the device tree and counts
397  * the virtual processors, this does not include threads.
398  */
399 static int lparcfg_count_active_processors(void)
400 {
401         struct device_node *cpus_dn = NULL;
402         int count = 0;
403
404         while ((cpus_dn = of_find_node_by_type(cpus_dn, "cpu"))) {
405 #ifdef LPARCFG_DEBUG
406                 printk(KERN_ERR "cpus_dn %p \n", cpus_dn);
407 #endif
408                 count++;
409         }
410         return count;
411 }
412
413 static void pseries_cmo_data(struct seq_file *m)
414 {
415         int cpu;
416         unsigned long cmo_faults = 0;
417         unsigned long cmo_fault_time = 0;
418
419         seq_printf(m, "cmo_enabled=%d\n", firmware_has_feature(FW_FEATURE_CMO));
420
421         if (!firmware_has_feature(FW_FEATURE_CMO))
422                 return;
423
424         for_each_possible_cpu(cpu) {
425                 cmo_faults += lppaca[cpu].cmo_faults;
426                 cmo_fault_time += lppaca[cpu].cmo_fault_time;
427         }
428
429         seq_printf(m, "cmo_faults=%lu\n", cmo_faults);
430         seq_printf(m, "cmo_fault_time_usec=%lu\n",
431                    cmo_fault_time / tb_ticks_per_usec);
432         seq_printf(m, "cmo_primary_psp=%d\n", cmo_get_primary_psp());
433         seq_printf(m, "cmo_secondary_psp=%d\n", cmo_get_secondary_psp());
434         seq_printf(m, "cmo_page_size=%lu\n", cmo_get_page_size());
435 }
436
437 static void splpar_dispatch_data(struct seq_file *m)
438 {
439         int cpu;
440         unsigned long dispatches = 0;
441         unsigned long dispatch_dispersions = 0;
442
443         for_each_possible_cpu(cpu) {
444                 dispatches += lppaca[cpu].yield_count;
445                 dispatch_dispersions += lppaca[cpu].dispersion_count;
446         }
447
448         seq_printf(m, "dispatches=%lu\n", dispatches);
449         seq_printf(m, "dispatch_dispersions=%lu\n", dispatch_dispersions);
450 }
451
452 static int pseries_lparcfg_data(struct seq_file *m, void *v)
453 {
454         int partition_potential_processors;
455         int partition_active_processors;
456         struct device_node *rtas_node;
457         const int *lrdrp = NULL;
458
459         rtas_node = of_find_node_by_path("/rtas");
460         if (rtas_node)
461                 lrdrp = of_get_property(rtas_node, "ibm,lrdr-capacity", NULL);
462
463         if (lrdrp == NULL) {
464                 partition_potential_processors = vdso_data->processorCount;
465         } else {
466                 partition_potential_processors = *(lrdrp + 4);
467         }
468         of_node_put(rtas_node);
469
470         partition_active_processors = lparcfg_count_active_processors();
471
472         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
473                 /* this call handles the ibm,get-system-parameter contents */
474                 parse_system_parameter_string(m);
475                 parse_ppp_data(m);
476                 parse_mpp_data(m);
477                 pseries_cmo_data(m);
478                 splpar_dispatch_data(m);
479
480                 seq_printf(m, "purr=%ld\n", get_purr());
481         } else {                /* non SPLPAR case */
482
483                 seq_printf(m, "system_active_processors=%d\n",
484                            partition_potential_processors);
485
486                 seq_printf(m, "system_potential_processors=%d\n",
487                            partition_potential_processors);
488
489                 seq_printf(m, "partition_max_entitled_capacity=%d\n",
490                            partition_potential_processors * 100);
491
492                 seq_printf(m, "partition_entitled_capacity=%d\n",
493                            partition_active_processors * 100);
494         }
495
496         seq_printf(m, "partition_active_processors=%d\n",
497                    partition_active_processors);
498
499         seq_printf(m, "partition_potential_processors=%d\n",
500                    partition_potential_processors);
501
502         seq_printf(m, "shared_processor_mode=%d\n", lppaca[0].shared_proc);
503
504         return 0;
505 }
506
507 static ssize_t update_ppp(u64 *entitlement, u8 *weight)
508 {
509         struct hvcall_ppp_data ppp_data;
510         u8 new_weight;
511         u64 new_entitled;
512         ssize_t retval;
513
514         /* Get our current parameters */
515         retval = h_get_ppp(&ppp_data);
516         if (retval)
517                 return retval;
518
519         if (entitlement) {
520                 new_weight = ppp_data.weight;
521                 new_entitled = *entitlement;
522         } else if (weight) {
523                 new_weight = *weight;
524                 new_entitled = ppp_data.entitlement;
525         } else
526                 return -EINVAL;
527
528         pr_debug("%s: current_entitled = %llu, current_weight = %u\n",
529                  __func__, ppp_data.entitlement, ppp_data.weight);
530
531         pr_debug("%s: new_entitled = %llu, new_weight = %u\n",
532                  __func__, new_entitled, new_weight);
533
534         retval = plpar_hcall_norets(H_SET_PPP, new_entitled, new_weight);
535         return retval;
536 }
537
538 /**
539  * update_mpp
540  *
541  * Update the memory entitlement and weight for the partition.  Caller must
542  * specify either a new entitlement or weight, not both, to be updated
543  * since the h_set_mpp call takes both entitlement and weight as parameters.
544  */
545 static ssize_t update_mpp(u64 *entitlement, u8 *weight)
546 {
547         struct hvcall_mpp_data mpp_data;
548         u64 new_entitled;
549         u8 new_weight;
550         ssize_t rc;
551
552         if (entitlement) {
553                 /* Check with vio to ensure the new memory entitlement
554                  * can be handled.
555                  */
556                 rc = vio_cmo_entitlement_update(*entitlement);
557                 if (rc)
558                         return rc;
559         }
560
561         rc = h_get_mpp(&mpp_data);
562         if (rc)
563                 return rc;
564
565         if (entitlement) {
566                 new_weight = mpp_data.mem_weight;
567                 new_entitled = *entitlement;
568         } else if (weight) {
569                 new_weight = *weight;
570                 new_entitled = mpp_data.entitled_mem;
571         } else
572                 return -EINVAL;
573
574         pr_debug("%s: current_entitled = %lu, current_weight = %u\n",
575                  __func__, mpp_data.entitled_mem, mpp_data.mem_weight);
576
577         pr_debug("%s: new_entitled = %llu, new_weight = %u\n",
578                  __func__, new_entitled, new_weight);
579
580         rc = plpar_hcall_norets(H_SET_MPP, new_entitled, new_weight);
581         return rc;
582 }
583
584 /*
585  * Interface for changing system parameters (variable capacity weight
586  * and entitled capacity).  Format of input is "param_name=value";
587  * anything after value is ignored.  Valid parameters at this time are
588  * "partition_entitled_capacity" and "capacity_weight".  We use
589  * H_SET_PPP to alter parameters.
590  *
591  * This function should be invoked only on systems with
592  * FW_FEATURE_SPLPAR.
593  */
594 static ssize_t lparcfg_write(struct file *file, const char __user * buf,
595                              size_t count, loff_t * off)
596 {
597         int kbuf_sz = 64;
598         char kbuf[kbuf_sz];
599         char *tmp;
600         u64 new_entitled, *new_entitled_ptr = &new_entitled;
601         u8 new_weight, *new_weight_ptr = &new_weight;
602         ssize_t retval;
603
604         if (!firmware_has_feature(FW_FEATURE_SPLPAR) ||
605                         firmware_has_feature(FW_FEATURE_ISERIES))
606                 return -EINVAL;
607
608         if (count > kbuf_sz)
609                 return -EINVAL;
610
611         if (copy_from_user(kbuf, buf, count))
612                 return -EFAULT;
613
614         kbuf[count - 1] = '\0';
615         tmp = strchr(kbuf, '=');
616         if (!tmp)
617                 return -EINVAL;
618
619         *tmp++ = '\0';
620
621         if (!strcmp(kbuf, "partition_entitled_capacity")) {
622                 char *endp;
623                 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
624                 if (endp == tmp)
625                         return -EINVAL;
626
627                 retval = update_ppp(new_entitled_ptr, NULL);
628         } else if (!strcmp(kbuf, "capacity_weight")) {
629                 char *endp;
630                 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
631                 if (endp == tmp)
632                         return -EINVAL;
633
634                 retval = update_ppp(NULL, new_weight_ptr);
635         } else if (!strcmp(kbuf, "entitled_memory")) {
636                 char *endp;
637                 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
638                 if (endp == tmp)
639                         return -EINVAL;
640
641                 retval = update_mpp(new_entitled_ptr, NULL);
642         } else if (!strcmp(kbuf, "entitled_memory_weight")) {
643                 char *endp;
644                 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
645                 if (endp == tmp)
646                         return -EINVAL;
647
648                 retval = update_mpp(NULL, new_weight_ptr);
649         } else
650                 return -EINVAL;
651
652         if (retval == H_SUCCESS || retval == H_CONSTRAINED) {
653                 retval = count;
654         } else if (retval == H_BUSY) {
655                 retval = -EBUSY;
656         } else if (retval == H_HARDWARE) {
657                 retval = -EIO;
658         } else if (retval == H_PARAMETER) {
659                 retval = -EINVAL;
660         }
661
662         return retval;
663 }
664
665 #else                           /* CONFIG_PPC_PSERIES */
666
667 static int pseries_lparcfg_data(struct seq_file *m, void *v)
668 {
669         return 0;
670 }
671
672 static ssize_t lparcfg_write(struct file *file, const char __user * buf,
673                              size_t count, loff_t * off)
674 {
675         return -EINVAL;
676 }
677
678 #endif                          /* CONFIG_PPC_PSERIES */
679
680 static int lparcfg_data(struct seq_file *m, void *v)
681 {
682         struct device_node *rootdn;
683         const char *model = "";
684         const char *system_id = "";
685         const char *tmp;
686         const unsigned int *lp_index_ptr;
687         unsigned int lp_index = 0;
688
689         seq_printf(m, "%s %s \n", MODULE_NAME, MODULE_VERS);
690
691         rootdn = of_find_node_by_path("/");
692         if (rootdn) {
693                 tmp = of_get_property(rootdn, "model", NULL);
694                 if (tmp) {
695                         model = tmp;
696                         /* Skip "IBM," - see platforms/iseries/dt.c */
697                         if (firmware_has_feature(FW_FEATURE_ISERIES))
698                                 model += 4;
699                 }
700                 tmp = of_get_property(rootdn, "system-id", NULL);
701                 if (tmp) {
702                         system_id = tmp;
703                         /* Skip "IBM," - see platforms/iseries/dt.c */
704                         if (firmware_has_feature(FW_FEATURE_ISERIES))
705                                 system_id += 4;
706                 }
707                 lp_index_ptr = of_get_property(rootdn, "ibm,partition-no",
708                                         NULL);
709                 if (lp_index_ptr)
710                         lp_index = *lp_index_ptr;
711                 of_node_put(rootdn);
712         }
713         seq_printf(m, "serial_number=%s\n", system_id);
714         seq_printf(m, "system_type=%s\n", model);
715         seq_printf(m, "partition_id=%d\n", (int)lp_index);
716
717         if (firmware_has_feature(FW_FEATURE_ISERIES))
718                 return iseries_lparcfg_data(m, v);
719         return pseries_lparcfg_data(m, v);
720 }
721
722 static int lparcfg_open(struct inode *inode, struct file *file)
723 {
724         return single_open(file, lparcfg_data, NULL);
725 }
726
727 static const struct file_operations lparcfg_fops = {
728         .owner          = THIS_MODULE,
729         .read           = seq_read,
730         .write          = lparcfg_write,
731         .open           = lparcfg_open,
732         .release        = single_release,
733 };
734
735 static int __init lparcfg_init(void)
736 {
737         struct proc_dir_entry *ent;
738         mode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
739
740         /* Allow writing if we have FW_FEATURE_SPLPAR */
741         if (firmware_has_feature(FW_FEATURE_SPLPAR) &&
742                         !firmware_has_feature(FW_FEATURE_ISERIES))
743                 mode |= S_IWUSR;
744
745         ent = proc_create("ppc64/lparcfg", mode, NULL, &lparcfg_fops);
746         if (!ent) {
747                 printk(KERN_ERR "Failed to create ppc64/lparcfg\n");
748                 return -EIO;
749         }
750
751         proc_ppc64_lparcfg = ent;
752         return 0;
753 }
754
755 static void __exit lparcfg_cleanup(void)
756 {
757         if (proc_ppc64_lparcfg)
758                 remove_proc_entry("lparcfg", proc_ppc64_lparcfg->parent);
759 }
760
761 module_init(lparcfg_init);
762 module_exit(lparcfg_cleanup);
763 MODULE_DESCRIPTION("Interface for LPAR configuration data");
764 MODULE_AUTHOR("Dave Engebretsen");
765 MODULE_LICENSE("GPL");