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 */
get_purr(void)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 */
iseries_lparcfg_data(struct seq_file * m,void * v)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
iseries_lparcfg_data(struct seq_file * m,void * v)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 */
h_get_ppp(struct hvcall_ppp_data * ppp_data)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
h_pic(unsigned long * pool_idle_time,unsigned long * num_procs)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 */
parse_ppp_data(struct seq_file * m)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 */
parse_mpp_data(struct seq_file * m)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 */
parse_mpp_x_data(struct seq_file * m)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 */
parse_system_parameter_string(struct seq_file * m)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 */
lparcfg_count_active_processors(void)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
pseries_cmo_data(struct seq_file * m)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
splpar_dispatch_data(struct seq_file * m)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
parse_em_data(struct seq_file * m)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
pseries_lparcfg_data(struct seq_file * m,void * v)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
update_ppp(u64 * entitlement,u8 * weight)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 */
update_mpp(u64 * entitlement,u8 * weight)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 */
lparcfg_write(struct file * file,const char __user * buf,size_t count,loff_t * off)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
pseries_lparcfg_data(struct seq_file * m,void * v)714 static int pseries_lparcfg_data(struct seq_file *m, void *v)
715 {
716 return 0;
717 }
718
lparcfg_write(struct file * file,const char __user * buf,size_t count,loff_t * off)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
lparcfg_data(struct seq_file * m,void * v)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
lparcfg_open(struct inode * inode,struct file * file)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
lparcfg_init(void)783 static int __init lparcfg_init(void)
784 {
785 struct proc_dir_entry *ent;
786 umode_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
lparcfg_cleanup(void)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");
814