84daabe2fcbaf305ab8387b8ff0e5db00199b4e9
[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 struct hvcall_ppp_data {
137         u64     entitlement;
138         u64     unallocated_entitlement;
139         u16     group_num;
140         u16     pool_num;
141         u8      capped;
142         u8      weight;
143         u8      unallocated_weight;
144         u16     active_procs_in_pool;
145         u16     active_system_procs;
146         u16     phys_platform_procs;
147         u32     max_proc_cap_avail;
148         u32     entitled_proc_cap_avail;
149 };
150
151 /*
152  * H_GET_PPP hcall returns info in 4 parms.
153  *  entitled_capacity,unallocated_capacity,
154  *  aggregation, resource_capability).
155  *
156  *  R4 = Entitled Processor Capacity Percentage.
157  *  R5 = Unallocated Processor Capacity Percentage.
158  *  R6 (AABBCCDDEEFFGGHH).
159  *      XXXX - reserved (0)
160  *          XXXX - reserved (0)
161  *              XXXX - Group Number
162  *                  XXXX - Pool Number.
163  *  R7 (IIJJKKLLMMNNOOPP).
164  *      XX - reserved. (0)
165  *        XX - bit 0-6 reserved (0).   bit 7 is Capped indicator.
166  *          XX - variable processor Capacity Weight
167  *            XX - Unallocated Variable Processor Capacity Weight.
168  *              XXXX - Active processors in Physical Processor Pool.
169  *                  XXXX  - Processors active on platform.
170  *  R8 (QQQQRRRRRRSSSSSS). if ibm,partition-performance-parameters-level >= 1
171  *      XXXX - Physical platform procs allocated to virtualization.
172  *          XXXXXX - Max procs capacity % available to the partitions pool.
173  *                XXXXXX - Entitled procs capacity % available to the
174  *                         partitions pool.
175  */
176 static unsigned int h_get_ppp(struct hvcall_ppp_data *ppp_data)
177 {
178         unsigned long rc;
179         unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];
180
181         rc = plpar_hcall9(H_GET_PPP, retbuf);
182
183         ppp_data->entitlement = retbuf[0];
184         ppp_data->unallocated_entitlement = retbuf[1];
185
186         ppp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff;
187         ppp_data->pool_num = retbuf[2] & 0xffff;
188
189         ppp_data->capped = (retbuf[3] >> 6 * 8) & 0x01;
190         ppp_data->weight = (retbuf[3] >> 5 * 8) & 0xff;
191         ppp_data->unallocated_weight = (retbuf[3] >> 4 * 8) & 0xff;
192         ppp_data->active_procs_in_pool = (retbuf[3] >> 2 * 8) & 0xffff;
193         ppp_data->active_system_procs = retbuf[3] & 0xffff;
194
195         ppp_data->phys_platform_procs = retbuf[4] >> 6 * 8;
196         ppp_data->max_proc_cap_avail = (retbuf[4] >> 3 * 8) & 0xffffff;
197         ppp_data->entitled_proc_cap_avail = retbuf[4] & 0xffffff;
198
199         return rc;
200 }
201
202 static unsigned h_pic(unsigned long *pool_idle_time,
203                       unsigned long *num_procs)
204 {
205         unsigned long rc;
206         unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
207
208         rc = plpar_hcall(H_PIC, retbuf);
209
210         *pool_idle_time = retbuf[0];
211         *num_procs = retbuf[1];
212
213         return rc;
214 }
215
216 /*
217  * parse_ppp_data
218  * Parse out the data returned from h_get_ppp and h_pic
219  */
220 static void parse_ppp_data(struct seq_file *m)
221 {
222         struct hvcall_ppp_data ppp_data;
223         struct device_node *root;
224         const int *perf_level;
225         int rc;
226
227         rc = h_get_ppp(&ppp_data);
228         if (rc)
229                 return;
230
231         seq_printf(m, "partition_entitled_capacity=%lld\n",
232                    ppp_data.entitlement);
233         seq_printf(m, "group=%d\n", ppp_data.group_num);
234         seq_printf(m, "system_active_processors=%d\n",
235                    ppp_data.active_system_procs);
236
237         /* pool related entries are appropriate for shared configs */
238         if (lppaca_of(0).shared_proc) {
239                 unsigned long pool_idle_time, pool_procs;
240
241                 seq_printf(m, "pool=%d\n", ppp_data.pool_num);
242
243                 /* report pool_capacity in percentage */
244                 seq_printf(m, "pool_capacity=%d\n",
245                            ppp_data.active_procs_in_pool * 100);
246
247                 h_pic(&pool_idle_time, &pool_procs);
248                 seq_printf(m, "pool_idle_time=%ld\n", pool_idle_time);
249                 seq_printf(m, "pool_num_procs=%ld\n", pool_procs);
250         }
251
252         seq_printf(m, "unallocated_capacity_weight=%d\n",
253                    ppp_data.unallocated_weight);
254         seq_printf(m, "capacity_weight=%d\n", ppp_data.weight);
255         seq_printf(m, "capped=%d\n", ppp_data.capped);
256         seq_printf(m, "unallocated_capacity=%lld\n",
257                    ppp_data.unallocated_entitlement);
258
259         /* The last bits of information returned from h_get_ppp are only
260          * valid if the ibm,partition-performance-parameters-level
261          * property is >= 1.
262          */
263         root = of_find_node_by_path("/");
264         if (root) {
265                 perf_level = of_get_property(root,
266                                 "ibm,partition-performance-parameters-level",
267                                              NULL);
268                 if (perf_level && (*perf_level >= 1)) {
269                         seq_printf(m,
270                             "physical_procs_allocated_to_virtualization=%d\n",
271                                    ppp_data.phys_platform_procs);
272                         seq_printf(m, "max_proc_capacity_available=%d\n",
273                                    ppp_data.max_proc_cap_avail);
274                         seq_printf(m, "entitled_proc_capacity_available=%d\n",
275                                    ppp_data.entitled_proc_cap_avail);
276                 }
277
278                 of_node_put(root);
279         }
280 }
281
282 /**
283  * parse_mpp_data
284  * Parse out data returned from h_get_mpp
285  */
286 static void parse_mpp_data(struct seq_file *m)
287 {
288         struct hvcall_mpp_data mpp_data;
289         int rc;
290
291         rc = h_get_mpp(&mpp_data);
292         if (rc)
293                 return;
294
295         seq_printf(m, "entitled_memory=%ld\n", mpp_data.entitled_mem);
296
297         if (mpp_data.mapped_mem != -1)
298                 seq_printf(m, "mapped_entitled_memory=%ld\n",
299                            mpp_data.mapped_mem);
300
301         seq_printf(m, "entitled_memory_group_number=%d\n", mpp_data.group_num);
302         seq_printf(m, "entitled_memory_pool_number=%d\n", mpp_data.pool_num);
303
304         seq_printf(m, "entitled_memory_weight=%d\n", mpp_data.mem_weight);
305         seq_printf(m, "unallocated_entitled_memory_weight=%d\n",
306                    mpp_data.unallocated_mem_weight);
307         seq_printf(m, "unallocated_io_mapping_entitlement=%ld\n",
308                    mpp_data.unallocated_entitlement);
309
310         if (mpp_data.pool_size != -1)
311                 seq_printf(m, "entitled_memory_pool_size=%ld bytes\n",
312                            mpp_data.pool_size);
313
314         seq_printf(m, "entitled_memory_loan_request=%ld\n",
315                    mpp_data.loan_request);
316
317         seq_printf(m, "backing_memory=%ld bytes\n", mpp_data.backing_mem);
318 }
319
320 /**
321  * parse_mpp_x_data
322  * Parse out data returned from h_get_mpp_x
323  */
324 static void parse_mpp_x_data(struct seq_file *m)
325 {
326         struct hvcall_mpp_x_data mpp_x_data;
327
328         if (!firmware_has_feature(FW_FEATURE_XCMO))
329                 return;
330         if (h_get_mpp_x(&mpp_x_data))
331                 return;
332
333         seq_printf(m, "coalesced_bytes=%ld\n", mpp_x_data.coalesced_bytes);
334
335         if (mpp_x_data.pool_coalesced_bytes)
336                 seq_printf(m, "pool_coalesced_bytes=%ld\n",
337                            mpp_x_data.pool_coalesced_bytes);
338         if (mpp_x_data.pool_purr_cycles)
339                 seq_printf(m, "coalesce_pool_purr=%ld\n", mpp_x_data.pool_purr_cycles);
340         if (mpp_x_data.pool_spurr_cycles)
341                 seq_printf(m, "coalesce_pool_spurr=%ld\n", mpp_x_data.pool_spurr_cycles);
342 }
343
344 #define SPLPAR_CHARACTERISTICS_TOKEN 20
345 #define SPLPAR_MAXLENGTH 1026*(sizeof(char))
346
347 /*
348  * parse_system_parameter_string()
349  * Retrieve the potential_processors, max_entitled_capacity and friends
350  * through the get-system-parameter rtas call.  Replace keyword strings as
351  * necessary.
352  */
353 static void parse_system_parameter_string(struct seq_file *m)
354 {
355         int call_status;
356
357         unsigned char *local_buffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
358         if (!local_buffer) {
359                 printk(KERN_ERR "%s %s kmalloc failure at line %d\n",
360                        __FILE__, __func__, __LINE__);
361                 return;
362         }
363
364         spin_lock(&rtas_data_buf_lock);
365         memset(rtas_data_buf, 0, SPLPAR_MAXLENGTH);
366         call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
367                                 NULL,
368                                 SPLPAR_CHARACTERISTICS_TOKEN,
369                                 __pa(rtas_data_buf),
370                                 RTAS_DATA_BUF_SIZE);
371         memcpy(local_buffer, rtas_data_buf, SPLPAR_MAXLENGTH);
372         spin_unlock(&rtas_data_buf_lock);
373
374         if (call_status != 0) {
375                 printk(KERN_INFO
376                        "%s %s Error calling get-system-parameter (0x%x)\n",
377                        __FILE__, __func__, call_status);
378         } else {
379                 int splpar_strlen;
380                 int idx, w_idx;
381                 char *workbuffer = kzalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
382                 if (!workbuffer) {
383                         printk(KERN_ERR "%s %s kmalloc failure at line %d\n",
384                                __FILE__, __func__, __LINE__);
385                         kfree(local_buffer);
386                         return;
387                 }
388 #ifdef LPARCFG_DEBUG
389                 printk(KERN_INFO "success calling get-system-parameter\n");
390 #endif
391                 splpar_strlen = local_buffer[0] * 256 + local_buffer[1];
392                 local_buffer += 2;      /* step over strlen value */
393
394                 w_idx = 0;
395                 idx = 0;
396                 while ((*local_buffer) && (idx < splpar_strlen)) {
397                         workbuffer[w_idx++] = local_buffer[idx++];
398                         if ((local_buffer[idx] == ',')
399                             || (local_buffer[idx] == '\0')) {
400                                 workbuffer[w_idx] = '\0';
401                                 if (w_idx) {
402                                         /* avoid the empty string */
403                                         seq_printf(m, "%s\n", workbuffer);
404                                 }
405                                 memset(workbuffer, 0, SPLPAR_MAXLENGTH);
406                                 idx++;  /* skip the comma */
407                                 w_idx = 0;
408                         } else if (local_buffer[idx] == '=') {
409                                 /* code here to replace workbuffer contents
410                                    with different keyword strings */
411                                 if (0 == strcmp(workbuffer, "MaxEntCap")) {
412                                         strcpy(workbuffer,
413                                                "partition_max_entitled_capacity");
414                                         w_idx = strlen(workbuffer);
415                                 }
416                                 if (0 == strcmp(workbuffer, "MaxPlatProcs")) {
417                                         strcpy(workbuffer,
418                                                "system_potential_processors");
419                                         w_idx = strlen(workbuffer);
420                                 }
421                         }
422                 }
423                 kfree(workbuffer);
424                 local_buffer -= 2;      /* back up over strlen value */
425         }
426         kfree(local_buffer);
427 }
428
429 /* Return the number of processors in the system.
430  * This function reads through the device tree and counts
431  * the virtual processors, this does not include threads.
432  */
433 static int lparcfg_count_active_processors(void)
434 {
435         struct device_node *cpus_dn = NULL;
436         int count = 0;
437
438         while ((cpus_dn = of_find_node_by_type(cpus_dn, "cpu"))) {
439 #ifdef LPARCFG_DEBUG
440                 printk(KERN_ERR "cpus_dn %p\n", cpus_dn);
441 #endif
442                 count++;
443         }
444         return count;
445 }
446
447 static void pseries_cmo_data(struct seq_file *m)
448 {
449         int cpu;
450         unsigned long cmo_faults = 0;
451         unsigned long cmo_fault_time = 0;
452
453         seq_printf(m, "cmo_enabled=%d\n", firmware_has_feature(FW_FEATURE_CMO));
454
455         if (!firmware_has_feature(FW_FEATURE_CMO))
456                 return;
457
458         for_each_possible_cpu(cpu) {
459                 cmo_faults += lppaca_of(cpu).cmo_faults;
460                 cmo_fault_time += lppaca_of(cpu).cmo_fault_time;
461         }
462
463         seq_printf(m, "cmo_faults=%lu\n", cmo_faults);
464         seq_printf(m, "cmo_fault_time_usec=%lu\n",
465                    cmo_fault_time / tb_ticks_per_usec);
466         seq_printf(m, "cmo_primary_psp=%d\n", cmo_get_primary_psp());
467         seq_printf(m, "cmo_secondary_psp=%d\n", cmo_get_secondary_psp());
468         seq_printf(m, "cmo_page_size=%lu\n", cmo_get_page_size());
469 }
470
471 static void splpar_dispatch_data(struct seq_file *m)
472 {
473         int cpu;
474         unsigned long dispatches = 0;
475         unsigned long dispatch_dispersions = 0;
476
477         for_each_possible_cpu(cpu) {
478                 dispatches += lppaca_of(cpu).yield_count;
479                 dispatch_dispersions += lppaca_of(cpu).dispersion_count;
480         }
481
482         seq_printf(m, "dispatches=%lu\n", dispatches);
483         seq_printf(m, "dispatch_dispersions=%lu\n", dispatch_dispersions);
484 }
485
486 static void parse_em_data(struct seq_file *m)
487 {
488         unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
489
490         if (plpar_hcall(H_GET_EM_PARMS, retbuf) == H_SUCCESS)
491                 seq_printf(m, "power_mode_data=%016lx\n", retbuf[0]);
492 }
493
494 static int pseries_lparcfg_data(struct seq_file *m, void *v)
495 {
496         int partition_potential_processors;
497         int partition_active_processors;
498         struct device_node *rtas_node;
499         const int *lrdrp = NULL;
500
501         rtas_node = of_find_node_by_path("/rtas");
502         if (rtas_node)
503                 lrdrp = of_get_property(rtas_node, "ibm,lrdr-capacity", NULL);
504
505         if (lrdrp == NULL) {
506                 partition_potential_processors = vdso_data->processorCount;
507         } else {
508                 partition_potential_processors = *(lrdrp + 4);
509         }
510         of_node_put(rtas_node);
511
512         partition_active_processors = lparcfg_count_active_processors();
513
514         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
515                 /* this call handles the ibm,get-system-parameter contents */
516                 parse_system_parameter_string(m);
517                 parse_ppp_data(m);
518                 parse_mpp_data(m);
519                 parse_mpp_x_data(m);
520                 pseries_cmo_data(m);
521                 splpar_dispatch_data(m);
522
523                 seq_printf(m, "purr=%ld\n", get_purr());
524         } else {                /* non SPLPAR case */
525
526                 seq_printf(m, "system_active_processors=%d\n",
527                            partition_potential_processors);
528
529                 seq_printf(m, "system_potential_processors=%d\n",
530                            partition_potential_processors);
531
532                 seq_printf(m, "partition_max_entitled_capacity=%d\n",
533                            partition_potential_processors * 100);
534
535                 seq_printf(m, "partition_entitled_capacity=%d\n",
536                            partition_active_processors * 100);
537         }
538
539         seq_printf(m, "partition_active_processors=%d\n",
540                    partition_active_processors);
541
542         seq_printf(m, "partition_potential_processors=%d\n",
543                    partition_potential_processors);
544
545         seq_printf(m, "shared_processor_mode=%d\n", lppaca_of(0).shared_proc);
546
547         seq_printf(m, "slb_size=%d\n", mmu_slb_size);
548
549         parse_em_data(m);
550
551         return 0;
552 }
553
554 static ssize_t update_ppp(u64 *entitlement, u8 *weight)
555 {
556         struct hvcall_ppp_data ppp_data;
557         u8 new_weight;
558         u64 new_entitled;
559         ssize_t retval;
560
561         /* Get our current parameters */
562         retval = h_get_ppp(&ppp_data);
563         if (retval)
564                 return retval;
565
566         if (entitlement) {
567                 new_weight = ppp_data.weight;
568                 new_entitled = *entitlement;
569         } else if (weight) {
570                 new_weight = *weight;
571                 new_entitled = ppp_data.entitlement;
572         } else
573                 return -EINVAL;
574
575         pr_debug("%s: current_entitled = %llu, current_weight = %u\n",
576                  __func__, ppp_data.entitlement, ppp_data.weight);
577
578         pr_debug("%s: new_entitled = %llu, new_weight = %u\n",
579                  __func__, new_entitled, new_weight);
580
581         retval = plpar_hcall_norets(H_SET_PPP, new_entitled, new_weight);
582         return retval;
583 }
584
585 /**
586  * update_mpp
587  *
588  * Update the memory entitlement and weight for the partition.  Caller must
589  * specify either a new entitlement or weight, not both, to be updated
590  * since the h_set_mpp call takes both entitlement and weight as parameters.
591  */
592 static ssize_t update_mpp(u64 *entitlement, u8 *weight)
593 {
594         struct hvcall_mpp_data mpp_data;
595         u64 new_entitled;
596         u8 new_weight;
597         ssize_t rc;
598
599         if (entitlement) {
600                 /* Check with vio to ensure the new memory entitlement
601                  * can be handled.
602                  */
603                 rc = vio_cmo_entitlement_update(*entitlement);
604                 if (rc)
605                         return rc;
606         }
607
608         rc = h_get_mpp(&mpp_data);
609         if (rc)
610                 return rc;
611
612         if (entitlement) {
613                 new_weight = mpp_data.mem_weight;
614                 new_entitled = *entitlement;
615         } else if (weight) {
616                 new_weight = *weight;
617                 new_entitled = mpp_data.entitled_mem;
618         } else
619                 return -EINVAL;
620
621         pr_debug("%s: current_entitled = %lu, current_weight = %u\n",
622                  __func__, mpp_data.entitled_mem, mpp_data.mem_weight);
623
624         pr_debug("%s: new_entitled = %llu, new_weight = %u\n",
625                  __func__, new_entitled, new_weight);
626
627         rc = plpar_hcall_norets(H_SET_MPP, new_entitled, new_weight);
628         return rc;
629 }
630
631 /*
632  * Interface for changing system parameters (variable capacity weight
633  * and entitled capacity).  Format of input is "param_name=value";
634  * anything after value is ignored.  Valid parameters at this time are
635  * "partition_entitled_capacity" and "capacity_weight".  We use
636  * H_SET_PPP to alter parameters.
637  *
638  * This function should be invoked only on systems with
639  * FW_FEATURE_SPLPAR.
640  */
641 static ssize_t lparcfg_write(struct file *file, const char __user * buf,
642                              size_t count, loff_t * off)
643 {
644         int kbuf_sz = 64;
645         char kbuf[kbuf_sz];
646         char *tmp;
647         u64 new_entitled, *new_entitled_ptr = &new_entitled;
648         u8 new_weight, *new_weight_ptr = &new_weight;
649         ssize_t retval;
650
651         if (!firmware_has_feature(FW_FEATURE_SPLPAR) ||
652                         firmware_has_feature(FW_FEATURE_ISERIES))
653                 return -EINVAL;
654
655         if (count > kbuf_sz)
656                 return -EINVAL;
657
658         if (copy_from_user(kbuf, buf, count))
659                 return -EFAULT;
660
661         kbuf[count - 1] = '\0';
662         tmp = strchr(kbuf, '=');
663         if (!tmp)
664                 return -EINVAL;
665
666         *tmp++ = '\0';
667
668         if (!strcmp(kbuf, "partition_entitled_capacity")) {
669                 char *endp;
670                 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
671                 if (endp == tmp)
672                         return -EINVAL;
673
674                 retval = update_ppp(new_entitled_ptr, NULL);
675         } else if (!strcmp(kbuf, "capacity_weight")) {
676                 char *endp;
677                 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
678                 if (endp == tmp)
679                         return -EINVAL;
680
681                 retval = update_ppp(NULL, new_weight_ptr);
682         } else if (!strcmp(kbuf, "entitled_memory")) {
683                 char *endp;
684                 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
685                 if (endp == tmp)
686                         return -EINVAL;
687
688                 retval = update_mpp(new_entitled_ptr, NULL);
689         } else if (!strcmp(kbuf, "entitled_memory_weight")) {
690                 char *endp;
691                 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
692                 if (endp == tmp)
693                         return -EINVAL;
694
695                 retval = update_mpp(NULL, new_weight_ptr);
696         } else
697                 return -EINVAL;
698
699         if (retval == H_SUCCESS || retval == H_CONSTRAINED) {
700                 retval = count;
701         } else if (retval == H_BUSY) {
702                 retval = -EBUSY;
703         } else if (retval == H_HARDWARE) {
704                 retval = -EIO;
705         } else if (retval == H_PARAMETER) {
706                 retval = -EINVAL;
707         }
708
709         return retval;
710 }
711
712 #else                           /* CONFIG_PPC_PSERIES */
713
714 static int pseries_lparcfg_data(struct seq_file *m, void *v)
715 {
716         return 0;
717 }
718
719 static ssize_t lparcfg_write(struct file *file, const char __user * buf,
720                              size_t count, loff_t * off)
721 {
722         return -EINVAL;
723 }
724
725 #endif                          /* CONFIG_PPC_PSERIES */
726
727 static int lparcfg_data(struct seq_file *m, void *v)
728 {
729         struct device_node *rootdn;
730         const char *model = "";
731         const char *system_id = "";
732         const char *tmp;
733         const unsigned int *lp_index_ptr;
734         unsigned int lp_index = 0;
735
736         seq_printf(m, "%s %s\n", MODULE_NAME, MODULE_VERS);
737
738         rootdn = of_find_node_by_path("/");
739         if (rootdn) {
740                 tmp = of_get_property(rootdn, "model", NULL);
741                 if (tmp) {
742                         model = tmp;
743                         /* Skip "IBM," - see platforms/iseries/dt.c */
744                         if (firmware_has_feature(FW_FEATURE_ISERIES))
745                                 model += 4;
746                 }
747                 tmp = of_get_property(rootdn, "system-id", NULL);
748                 if (tmp) {
749                         system_id = tmp;
750                         /* Skip "IBM," - see platforms/iseries/dt.c */
751                         if (firmware_has_feature(FW_FEATURE_ISERIES))
752                                 system_id += 4;
753                 }
754                 lp_index_ptr = of_get_property(rootdn, "ibm,partition-no",
755                                         NULL);
756                 if (lp_index_ptr)
757                         lp_index = *lp_index_ptr;
758                 of_node_put(rootdn);
759         }
760         seq_printf(m, "serial_number=%s\n", system_id);
761         seq_printf(m, "system_type=%s\n", model);
762         seq_printf(m, "partition_id=%d\n", (int)lp_index);
763
764         if (firmware_has_feature(FW_FEATURE_ISERIES))
765                 return iseries_lparcfg_data(m, v);
766         return pseries_lparcfg_data(m, v);
767 }
768
769 static int lparcfg_open(struct inode *inode, struct file *file)
770 {
771         return single_open(file, lparcfg_data, NULL);
772 }
773
774 static const struct file_operations lparcfg_fops = {
775         .owner          = THIS_MODULE,
776         .read           = seq_read,
777         .write          = lparcfg_write,
778         .open           = lparcfg_open,
779         .release        = single_release,
780         .llseek         = seq_lseek,
781 };
782
783 static int __init lparcfg_init(void)
784 {
785         struct proc_dir_entry *ent;
786         mode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
787
788         /* Allow writing if we have FW_FEATURE_SPLPAR */
789         if (firmware_has_feature(FW_FEATURE_SPLPAR) &&
790                         !firmware_has_feature(FW_FEATURE_ISERIES))
791                 mode |= S_IWUSR;
792
793         ent = proc_create("powerpc/lparcfg", mode, NULL, &lparcfg_fops);
794         if (!ent) {
795                 printk(KERN_ERR "Failed to create powerpc/lparcfg\n");
796                 return -EIO;
797         }
798
799         proc_ppc64_lparcfg = ent;
800         return 0;
801 }
802
803 static void __exit lparcfg_cleanup(void)
804 {
805         if (proc_ppc64_lparcfg)
806                 remove_proc_entry("lparcfg", proc_ppc64_lparcfg->parent);
807 }
808
809 module_init(lparcfg_init);
810 module_exit(lparcfg_cleanup);
811 MODULE_DESCRIPTION("Interface for LPAR configuration data");
812 MODULE_AUTHOR("Dave Engebretsen");
813 MODULE_LICENSE("GPL");