16468362ad579c5581d59f10feb8595336291eab
[linux-2.6.git] / 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 <linux/slab.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/prom.h>
37 #include <asm/vdso_datapage.h>
38 #include <asm/vio.h>
39 #include <asm/mmu.h>
40
41 #define MODULE_VERS "1.9"
42 #define MODULE_NAME "lparcfg"
43
44 /* #define LPARCFG_DEBUG */
45
46 static struct proc_dir_entry *proc_ppc64_lparcfg;
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_of(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)(local_paca->lppaca_ptr->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 /**
136  * h_get_mpp
137  * H_GET_MPP hcall returns info in 7 parms
138  */
139 int h_get_mpp(struct hvcall_mpp_data *mpp_data)
140 {
141         int rc;
142         unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];
143
144         rc = plpar_hcall9(H_GET_MPP, retbuf);
145
146         mpp_data->entitled_mem = retbuf[0];
147         mpp_data->mapped_mem = retbuf[1];
148
149         mpp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff;
150         mpp_data->pool_num = retbuf[2] & 0xffff;
151
152         mpp_data->mem_weight = (retbuf[3] >> 7 * 8) & 0xff;
153         mpp_data->unallocated_mem_weight = (retbuf[3] >> 6 * 8) & 0xff;
154         mpp_data->unallocated_entitlement = retbuf[3] & 0xffffffffffff;
155
156         mpp_data->pool_size = retbuf[4];
157         mpp_data->loan_request = retbuf[5];
158         mpp_data->backing_mem = retbuf[6];
159
160         return rc;
161 }
162 EXPORT_SYMBOL(h_get_mpp);
163
164 struct hvcall_ppp_data {
165         u64     entitlement;
166         u64     unallocated_entitlement;
167         u16     group_num;
168         u16     pool_num;
169         u8      capped;
170         u8      weight;
171         u8      unallocated_weight;
172         u16     active_procs_in_pool;
173         u16     active_system_procs;
174         u16     phys_platform_procs;
175         u32     max_proc_cap_avail;
176         u32     entitled_proc_cap_avail;
177 };
178
179 /*
180  * H_GET_PPP hcall returns info in 4 parms.
181  *  entitled_capacity,unallocated_capacity,
182  *  aggregation, resource_capability).
183  *
184  *  R4 = Entitled Processor Capacity Percentage.
185  *  R5 = Unallocated Processor Capacity Percentage.
186  *  R6 (AABBCCDDEEFFGGHH).
187  *      XXXX - reserved (0)
188  *          XXXX - reserved (0)
189  *              XXXX - Group Number
190  *                  XXXX - Pool Number.
191  *  R7 (IIJJKKLLMMNNOOPP).
192  *      XX - reserved. (0)
193  *        XX - bit 0-6 reserved (0).   bit 7 is Capped indicator.
194  *          XX - variable processor Capacity Weight
195  *            XX - Unallocated Variable Processor Capacity Weight.
196  *              XXXX - Active processors in Physical Processor Pool.
197  *                  XXXX  - Processors active on platform.
198  *  R8 (QQQQRRRRRRSSSSSS). if ibm,partition-performance-parameters-level >= 1
199  *      XXXX - Physical platform procs allocated to virtualization.
200  *          XXXXXX - Max procs capacity % available to the partitions pool.
201  *                XXXXXX - Entitled procs capacity % available to the
202  *                         partitions pool.
203  */
204 static unsigned int h_get_ppp(struct hvcall_ppp_data *ppp_data)
205 {
206         unsigned long rc;
207         unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];
208
209         rc = plpar_hcall9(H_GET_PPP, retbuf);
210
211         ppp_data->entitlement = retbuf[0];
212         ppp_data->unallocated_entitlement = retbuf[1];
213
214         ppp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff;
215         ppp_data->pool_num = retbuf[2] & 0xffff;
216
217         ppp_data->capped = (retbuf[3] >> 6 * 8) & 0x01;
218         ppp_data->weight = (retbuf[3] >> 5 * 8) & 0xff;
219         ppp_data->unallocated_weight = (retbuf[3] >> 4 * 8) & 0xff;
220         ppp_data->active_procs_in_pool = (retbuf[3] >> 2 * 8) & 0xffff;
221         ppp_data->active_system_procs = retbuf[3] & 0xffff;
222
223         ppp_data->phys_platform_procs = retbuf[4] >> 6 * 8;
224         ppp_data->max_proc_cap_avail = (retbuf[4] >> 3 * 8) & 0xffffff;
225         ppp_data->entitled_proc_cap_avail = retbuf[4] & 0xffffff;
226
227         return rc;
228 }
229
230 static unsigned h_pic(unsigned long *pool_idle_time,
231                       unsigned long *num_procs)
232 {
233         unsigned long rc;
234         unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
235
236         rc = plpar_hcall(H_PIC, retbuf);
237
238         *pool_idle_time = retbuf[0];
239         *num_procs = retbuf[1];
240
241         return rc;
242 }
243
244 /*
245  * parse_ppp_data
246  * Parse out the data returned from h_get_ppp and h_pic
247  */
248 static void parse_ppp_data(struct seq_file *m)
249 {
250         struct hvcall_ppp_data ppp_data;
251         struct device_node *root;
252         const int *perf_level;
253         int rc;
254
255         rc = h_get_ppp(&ppp_data);
256         if (rc)
257                 return;
258
259         seq_printf(m, "partition_entitled_capacity=%lld\n",
260                    ppp_data.entitlement);
261         seq_printf(m, "group=%d\n", ppp_data.group_num);
262         seq_printf(m, "system_active_processors=%d\n",
263                    ppp_data.active_system_procs);
264
265         /* pool related entries are apropriate for shared configs */
266         if (lppaca_of(0).shared_proc) {
267                 unsigned long pool_idle_time, pool_procs;
268
269                 seq_printf(m, "pool=%d\n", ppp_data.pool_num);
270
271                 /* report pool_capacity in percentage */
272                 seq_printf(m, "pool_capacity=%d\n",
273                            ppp_data.active_procs_in_pool * 100);
274
275                 h_pic(&pool_idle_time, &pool_procs);
276                 seq_printf(m, "pool_idle_time=%ld\n", pool_idle_time);
277                 seq_printf(m, "pool_num_procs=%ld\n", pool_procs);
278         }
279
280         seq_printf(m, "unallocated_capacity_weight=%d\n",
281                    ppp_data.unallocated_weight);
282         seq_printf(m, "capacity_weight=%d\n", ppp_data.weight);
283         seq_printf(m, "capped=%d\n", ppp_data.capped);
284         seq_printf(m, "unallocated_capacity=%lld\n",
285                    ppp_data.unallocated_entitlement);
286
287         /* The last bits of information returned from h_get_ppp are only
288          * valid if the ibm,partition-performance-parameters-level
289          * property is >= 1.
290          */
291         root = of_find_node_by_path("/");
292         if (root) {
293                 perf_level = of_get_property(root,
294                                 "ibm,partition-performance-parameters-level",
295                                              NULL);
296                 if (perf_level && (*perf_level >= 1)) {
297                         seq_printf(m,
298                             "physical_procs_allocated_to_virtualization=%d\n",
299                                    ppp_data.phys_platform_procs);
300                         seq_printf(m, "max_proc_capacity_available=%d\n",
301                                    ppp_data.max_proc_cap_avail);
302                         seq_printf(m, "entitled_proc_capacity_available=%d\n",
303                                    ppp_data.entitled_proc_cap_avail);
304                 }
305
306                 of_node_put(root);
307         }
308 }
309
310 /**
311  * parse_mpp_data
312  * Parse out data returned from h_get_mpp
313  */
314 static void parse_mpp_data(struct seq_file *m)
315 {
316         struct hvcall_mpp_data mpp_data;
317         int rc;
318
319         rc = h_get_mpp(&mpp_data);
320         if (rc)
321                 return;
322
323         seq_printf(m, "entitled_memory=%ld\n", mpp_data.entitled_mem);
324
325         if (mpp_data.mapped_mem != -1)
326                 seq_printf(m, "mapped_entitled_memory=%ld\n",
327                            mpp_data.mapped_mem);
328
329         seq_printf(m, "entitled_memory_group_number=%d\n", mpp_data.group_num);
330         seq_printf(m, "entitled_memory_pool_number=%d\n", mpp_data.pool_num);
331
332         seq_printf(m, "entitled_memory_weight=%d\n", mpp_data.mem_weight);
333         seq_printf(m, "unallocated_entitled_memory_weight=%d\n",
334                    mpp_data.unallocated_mem_weight);
335         seq_printf(m, "unallocated_io_mapping_entitlement=%ld\n",
336                    mpp_data.unallocated_entitlement);
337
338         if (mpp_data.pool_size != -1)
339                 seq_printf(m, "entitled_memory_pool_size=%ld bytes\n",
340                            mpp_data.pool_size);
341
342         seq_printf(m, "entitled_memory_loan_request=%ld\n",
343                    mpp_data.loan_request);
344
345         seq_printf(m, "backing_memory=%ld bytes\n", mpp_data.backing_mem);
346 }
347
348 #define SPLPAR_CHARACTERISTICS_TOKEN 20
349 #define SPLPAR_MAXLENGTH 1026*(sizeof(char))
350
351 /*
352  * parse_system_parameter_string()
353  * Retrieve the potential_processors, max_entitled_capacity and friends
354  * through the get-system-parameter rtas call.  Replace keyword strings as
355  * necessary.
356  */
357 static void parse_system_parameter_string(struct seq_file *m)
358 {
359         int call_status;
360
361         unsigned char *local_buffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
362         if (!local_buffer) {
363                 printk(KERN_ERR "%s %s kmalloc failure at line %d\n",
364                        __FILE__, __func__, __LINE__);
365                 return;
366         }
367
368         spin_lock(&rtas_data_buf_lock);
369         memset(rtas_data_buf, 0, SPLPAR_MAXLENGTH);
370         call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
371                                 NULL,
372                                 SPLPAR_CHARACTERISTICS_TOKEN,
373                                 __pa(rtas_data_buf),
374                                 RTAS_DATA_BUF_SIZE);
375         memcpy(local_buffer, rtas_data_buf, SPLPAR_MAXLENGTH);
376         spin_unlock(&rtas_data_buf_lock);
377
378         if (call_status != 0) {
379                 printk(KERN_INFO
380                        "%s %s Error calling get-system-parameter (0x%x)\n",
381                        __FILE__, __func__, call_status);
382         } else {
383                 int splpar_strlen;
384                 int idx, w_idx;
385                 char *workbuffer = kzalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
386                 if (!workbuffer) {
387                         printk(KERN_ERR "%s %s kmalloc failure at line %d\n",
388                                __FILE__, __func__, __LINE__);
389                         kfree(local_buffer);
390                         return;
391                 }
392 #ifdef LPARCFG_DEBUG
393                 printk(KERN_INFO "success calling get-system-parameter\n");
394 #endif
395                 splpar_strlen = local_buffer[0] * 256 + local_buffer[1];
396                 local_buffer += 2;      /* step over strlen value */
397
398                 w_idx = 0;
399                 idx = 0;
400                 while ((*local_buffer) && (idx < splpar_strlen)) {
401                         workbuffer[w_idx++] = local_buffer[idx++];
402                         if ((local_buffer[idx] == ',')
403                             || (local_buffer[idx] == '\0')) {
404                                 workbuffer[w_idx] = '\0';
405                                 if (w_idx) {
406                                         /* avoid the empty string */
407                                         seq_printf(m, "%s\n", workbuffer);
408                                 }
409                                 memset(workbuffer, 0, SPLPAR_MAXLENGTH);
410                                 idx++;  /* skip the comma */
411                                 w_idx = 0;
412                         } else if (local_buffer[idx] == '=') {
413                                 /* code here to replace workbuffer contents
414                                    with different keyword strings */
415                                 if (0 == strcmp(workbuffer, "MaxEntCap")) {
416                                         strcpy(workbuffer,
417                                                "partition_max_entitled_capacity");
418                                         w_idx = strlen(workbuffer);
419                                 }
420                                 if (0 == strcmp(workbuffer, "MaxPlatProcs")) {
421                                         strcpy(workbuffer,
422                                                "system_potential_processors");
423                                         w_idx = strlen(workbuffer);
424                                 }
425                         }
426                 }
427                 kfree(workbuffer);
428                 local_buffer -= 2;      /* back up over strlen value */
429         }
430         kfree(local_buffer);
431 }
432
433 /* Return the number of processors in the system.
434  * This function reads through the device tree and counts
435  * the virtual processors, this does not include threads.
436  */
437 static int lparcfg_count_active_processors(void)
438 {
439         struct device_node *cpus_dn = NULL;
440         int count = 0;
441
442         while ((cpus_dn = of_find_node_by_type(cpus_dn, "cpu"))) {
443 #ifdef LPARCFG_DEBUG
444                 printk(KERN_ERR "cpus_dn %p\n", cpus_dn);
445 #endif
446                 count++;
447         }
448         return count;
449 }
450
451 static void pseries_cmo_data(struct seq_file *m)
452 {
453         int cpu;
454         unsigned long cmo_faults = 0;
455         unsigned long cmo_fault_time = 0;
456
457         seq_printf(m, "cmo_enabled=%d\n", firmware_has_feature(FW_FEATURE_CMO));
458
459         if (!firmware_has_feature(FW_FEATURE_CMO))
460                 return;
461
462         for_each_possible_cpu(cpu) {
463                 cmo_faults += lppaca_of(cpu).cmo_faults;
464                 cmo_fault_time += lppaca_of(cpu).cmo_fault_time;
465         }
466
467         seq_printf(m, "cmo_faults=%lu\n", cmo_faults);
468         seq_printf(m, "cmo_fault_time_usec=%lu\n",
469                    cmo_fault_time / tb_ticks_per_usec);
470         seq_printf(m, "cmo_primary_psp=%d\n", cmo_get_primary_psp());
471         seq_printf(m, "cmo_secondary_psp=%d\n", cmo_get_secondary_psp());
472         seq_printf(m, "cmo_page_size=%lu\n", cmo_get_page_size());
473 }
474
475 static void splpar_dispatch_data(struct seq_file *m)
476 {
477         int cpu;
478         unsigned long dispatches = 0;
479         unsigned long dispatch_dispersions = 0;
480
481         for_each_possible_cpu(cpu) {
482                 dispatches += lppaca_of(cpu).yield_count;
483                 dispatch_dispersions += lppaca_of(cpu).dispersion_count;
484         }
485
486         seq_printf(m, "dispatches=%lu\n", dispatches);
487         seq_printf(m, "dispatch_dispersions=%lu\n", dispatch_dispersions);
488 }
489
490 static void parse_em_data(struct seq_file *m)
491 {
492         unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
493
494         if (plpar_hcall(H_GET_EM_PARMS, retbuf) == H_SUCCESS)
495                 seq_printf(m, "power_mode_data=%016lx\n", retbuf[0]);
496 }
497
498 static int pseries_lparcfg_data(struct seq_file *m, void *v)
499 {
500         int partition_potential_processors;
501         int partition_active_processors;
502         struct device_node *rtas_node;
503         const int *lrdrp = NULL;
504
505         rtas_node = of_find_node_by_path("/rtas");
506         if (rtas_node)
507                 lrdrp = of_get_property(rtas_node, "ibm,lrdr-capacity", NULL);
508
509         if (lrdrp == NULL) {
510                 partition_potential_processors = vdso_data->processorCount;
511         } else {
512                 partition_potential_processors = *(lrdrp + 4);
513         }
514         of_node_put(rtas_node);
515
516         partition_active_processors = lparcfg_count_active_processors();
517
518         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
519                 /* this call handles the ibm,get-system-parameter contents */
520                 parse_system_parameter_string(m);
521                 parse_ppp_data(m);
522                 parse_mpp_data(m);
523                 pseries_cmo_data(m);
524                 splpar_dispatch_data(m);
525
526                 seq_printf(m, "purr=%ld\n", get_purr());
527         } else {                /* non SPLPAR case */
528
529                 seq_printf(m, "system_active_processors=%d\n",
530                            partition_potential_processors);
531
532                 seq_printf(m, "system_potential_processors=%d\n",
533                            partition_potential_processors);
534
535                 seq_printf(m, "partition_max_entitled_capacity=%d\n",
536                            partition_potential_processors * 100);
537
538                 seq_printf(m, "partition_entitled_capacity=%d\n",
539                            partition_active_processors * 100);
540         }
541
542         seq_printf(m, "partition_active_processors=%d\n",
543                    partition_active_processors);
544
545         seq_printf(m, "partition_potential_processors=%d\n",
546                    partition_potential_processors);
547
548         seq_printf(m, "shared_processor_mode=%d\n", lppaca_of(0).shared_proc);
549
550         seq_printf(m, "slb_size=%d\n", mmu_slb_size);
551
552         parse_em_data(m);
553
554         return 0;
555 }
556
557 static ssize_t update_ppp(u64 *entitlement, u8 *weight)
558 {
559         struct hvcall_ppp_data ppp_data;
560         u8 new_weight;
561         u64 new_entitled;
562         ssize_t retval;
563
564         /* Get our current parameters */
565         retval = h_get_ppp(&ppp_data);
566         if (retval)
567                 return retval;
568
569         if (entitlement) {
570                 new_weight = ppp_data.weight;
571                 new_entitled = *entitlement;
572         } else if (weight) {
573                 new_weight = *weight;
574                 new_entitled = ppp_data.entitlement;
575         } else
576                 return -EINVAL;
577
578         pr_debug("%s: current_entitled = %llu, current_weight = %u\n",
579                  __func__, ppp_data.entitlement, ppp_data.weight);
580
581         pr_debug("%s: new_entitled = %llu, new_weight = %u\n",
582                  __func__, new_entitled, new_weight);
583
584         retval = plpar_hcall_norets(H_SET_PPP, new_entitled, new_weight);
585         return retval;
586 }
587
588 /**
589  * update_mpp
590  *
591  * Update the memory entitlement and weight for the partition.  Caller must
592  * specify either a new entitlement or weight, not both, to be updated
593  * since the h_set_mpp call takes both entitlement and weight as parameters.
594  */
595 static ssize_t update_mpp(u64 *entitlement, u8 *weight)
596 {
597         struct hvcall_mpp_data mpp_data;
598         u64 new_entitled;
599         u8 new_weight;
600         ssize_t rc;
601
602         if (entitlement) {
603                 /* Check with vio to ensure the new memory entitlement
604                  * can be handled.
605                  */
606                 rc = vio_cmo_entitlement_update(*entitlement);
607                 if (rc)
608                         return rc;
609         }
610
611         rc = h_get_mpp(&mpp_data);
612         if (rc)
613                 return rc;
614
615         if (entitlement) {
616                 new_weight = mpp_data.mem_weight;
617                 new_entitled = *entitlement;
618         } else if (weight) {
619                 new_weight = *weight;
620                 new_entitled = mpp_data.entitled_mem;
621         } else
622                 return -EINVAL;
623
624         pr_debug("%s: current_entitled = %lu, current_weight = %u\n",
625                  __func__, mpp_data.entitled_mem, mpp_data.mem_weight);
626
627         pr_debug("%s: new_entitled = %llu, new_weight = %u\n",
628                  __func__, new_entitled, new_weight);
629
630         rc = plpar_hcall_norets(H_SET_MPP, new_entitled, new_weight);
631         return rc;
632 }
633
634 /*
635  * Interface for changing system parameters (variable capacity weight
636  * and entitled capacity).  Format of input is "param_name=value";
637  * anything after value is ignored.  Valid parameters at this time are
638  * "partition_entitled_capacity" and "capacity_weight".  We use
639  * H_SET_PPP to alter parameters.
640  *
641  * This function should be invoked only on systems with
642  * FW_FEATURE_SPLPAR.
643  */
644 static ssize_t lparcfg_write(struct file *file, const char __user * buf,
645                              size_t count, loff_t * off)
646 {
647         int kbuf_sz = 64;
648         char kbuf[kbuf_sz];
649         char *tmp;
650         u64 new_entitled, *new_entitled_ptr = &new_entitled;
651         u8 new_weight, *new_weight_ptr = &new_weight;
652         ssize_t retval;
653
654         if (!firmware_has_feature(FW_FEATURE_SPLPAR) ||
655                         firmware_has_feature(FW_FEATURE_ISERIES))
656                 return -EINVAL;
657
658         if (count > kbuf_sz)
659                 return -EINVAL;
660
661         if (copy_from_user(kbuf, buf, count))
662                 return -EFAULT;
663
664         kbuf[count - 1] = '\0';
665         tmp = strchr(kbuf, '=');
666         if (!tmp)
667                 return -EINVAL;
668
669         *tmp++ = '\0';
670
671         if (!strcmp(kbuf, "partition_entitled_capacity")) {
672                 char *endp;
673                 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
674                 if (endp == tmp)
675                         return -EINVAL;
676
677                 retval = update_ppp(new_entitled_ptr, NULL);
678         } else if (!strcmp(kbuf, "capacity_weight")) {
679                 char *endp;
680                 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
681                 if (endp == tmp)
682                         return -EINVAL;
683
684                 retval = update_ppp(NULL, new_weight_ptr);
685         } else if (!strcmp(kbuf, "entitled_memory")) {
686                 char *endp;
687                 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
688                 if (endp == tmp)
689                         return -EINVAL;
690
691                 retval = update_mpp(new_entitled_ptr, NULL);
692         } else if (!strcmp(kbuf, "entitled_memory_weight")) {
693                 char *endp;
694                 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
695                 if (endp == tmp)
696                         return -EINVAL;
697
698                 retval = update_mpp(NULL, new_weight_ptr);
699         } else
700                 return -EINVAL;
701
702         if (retval == H_SUCCESS || retval == H_CONSTRAINED) {
703                 retval = count;
704         } else if (retval == H_BUSY) {
705                 retval = -EBUSY;
706         } else if (retval == H_HARDWARE) {
707                 retval = -EIO;
708         } else if (retval == H_PARAMETER) {
709                 retval = -EINVAL;
710         }
711
712         return retval;
713 }
714
715 #else                           /* CONFIG_PPC_PSERIES */
716
717 static int pseries_lparcfg_data(struct seq_file *m, void *v)
718 {
719         return 0;
720 }
721
722 static ssize_t lparcfg_write(struct file *file, const char __user * buf,
723                              size_t count, loff_t * off)
724 {
725         return -EINVAL;
726 }
727
728 #endif                          /* CONFIG_PPC_PSERIES */
729
730 static int lparcfg_data(struct seq_file *m, void *v)
731 {
732         struct device_node *rootdn;
733         const char *model = "";
734         const char *system_id = "";
735         const char *tmp;
736         const unsigned int *lp_index_ptr;
737         unsigned int lp_index = 0;
738
739         seq_printf(m, "%s %s\n", MODULE_NAME, MODULE_VERS);
740
741         rootdn = of_find_node_by_path("/");
742         if (rootdn) {
743                 tmp = of_get_property(rootdn, "model", NULL);
744                 if (tmp) {
745                         model = tmp;
746                         /* Skip "IBM," - see platforms/iseries/dt.c */
747                         if (firmware_has_feature(FW_FEATURE_ISERIES))
748                                 model += 4;
749                 }
750                 tmp = of_get_property(rootdn, "system-id", NULL);
751                 if (tmp) {
752                         system_id = tmp;
753                         /* Skip "IBM," - see platforms/iseries/dt.c */
754                         if (firmware_has_feature(FW_FEATURE_ISERIES))
755                                 system_id += 4;
756                 }
757                 lp_index_ptr = of_get_property(rootdn, "ibm,partition-no",
758                                         NULL);
759                 if (lp_index_ptr)
760                         lp_index = *lp_index_ptr;
761                 of_node_put(rootdn);
762         }
763         seq_printf(m, "serial_number=%s\n", system_id);
764         seq_printf(m, "system_type=%s\n", model);
765         seq_printf(m, "partition_id=%d\n", (int)lp_index);
766
767         if (firmware_has_feature(FW_FEATURE_ISERIES))
768                 return iseries_lparcfg_data(m, v);
769         return pseries_lparcfg_data(m, v);
770 }
771
772 static int lparcfg_open(struct inode *inode, struct file *file)
773 {
774         return single_open(file, lparcfg_data, NULL);
775 }
776
777 static const struct file_operations lparcfg_fops = {
778         .owner          = THIS_MODULE,
779         .read           = seq_read,
780         .write          = lparcfg_write,
781         .open           = lparcfg_open,
782         .release        = single_release,
783         .llseek         = seq_lseek,
784 };
785
786 static int __init lparcfg_init(void)
787 {
788         struct proc_dir_entry *ent;
789         mode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
790
791         /* Allow writing if we have FW_FEATURE_SPLPAR */
792         if (firmware_has_feature(FW_FEATURE_SPLPAR) &&
793                         !firmware_has_feature(FW_FEATURE_ISERIES))
794                 mode |= S_IWUSR;
795
796         ent = proc_create("powerpc/lparcfg", mode, NULL, &lparcfg_fops);
797         if (!ent) {
798                 printk(KERN_ERR "Failed to create powerpc/lparcfg\n");
799                 return -EIO;
800         }
801
802         proc_ppc64_lparcfg = ent;
803         return 0;
804 }
805
806 static void __exit lparcfg_cleanup(void)
807 {
808         if (proc_ppc64_lparcfg)
809                 remove_proc_entry("lparcfg", proc_ppc64_lparcfg->parent);
810 }
811
812 module_init(lparcfg_init);
813 module_exit(lparcfg_cleanup);
814 MODULE_DESCRIPTION("Interface for LPAR configuration data");
815 MODULE_AUTHOR("Dave Engebretsen");
816 MODULE_LICENSE("GPL");