1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * PowerPC64 LPAR Configuration Information Driver
4 *
5 * Dave Engebretsen engebret@us.ibm.com
6 * Copyright (c) 2003 Dave Engebretsen
7 * Will Schmidt willschm@us.ibm.com
8 * SPLPAR updates, Copyright (c) 2003 Will Schmidt IBM Corporation.
9 * seq_file updates, Copyright (c) 2004 Will Schmidt IBM Corporation.
10 * Nathan Lynch nathanl@austin.ibm.com
11 * Added lparcfg_write, Copyright (C) 2004 Nathan Lynch IBM Corporation.
12 *
13 * This driver creates a proc file at /proc/ppc64/lparcfg which contains
14 * keyword - value pairs that specify the configuration of the partition.
15 */
16
17#include <linux/module.h>
18#include <linux/types.h>
19#include <linux/errno.h>
20#include <linux/proc_fs.h>
21#include <linux/init.h>
22#include <asm/papr-sysparm.h>
23#include <linux/seq_file.h>
24#include <linux/slab.h>
25#include <linux/uaccess.h>
26#include <linux/hugetlb.h>
27#include <asm/lppaca.h>
28#include <asm/hvcall.h>
29#include <asm/firmware.h>
30#include <asm/rtas.h>
31#include <asm/time.h>
32#include <asm/vdso_datapage.h>
33#include <asm/vio.h>
34#include <asm/mmu.h>
35#include <asm/machdep.h>
36#include <asm/drmem.h>
37
38#include "pseries.h"
39#include "vas.h" /* pseries_vas_dlpar_cpu() */
40
41/*
42 * This isn't a module but we expose that to userspace
43 * via /proc so leave the definitions here
44 */
45#define MODULE_VERS "1.9"
46#define MODULE_NAME "lparcfg"
47
48/* #define LPARCFG_DEBUG */
49
50/*
51 * Track sum of all purrs across all processors. This is used to further
52 * calculate usage values by different applications
53 */
54static void cpu_get_purr(void *arg)
55{
56 atomic64_t *sum = arg;
57
58 atomic64_add(i: mfspr(SPRN_PURR), v: sum);
59}
60
61static unsigned long get_purr(void)
62{
63 atomic64_t purr = ATOMIC64_INIT(0);
64
65 on_each_cpu(func: cpu_get_purr, info: &purr, wait: 1);
66
67 return atomic64_read(v: &purr);
68}
69
70/*
71 * Methods used to fetch LPAR data when running on a pSeries platform.
72 */
73
74struct hvcall_ppp_data {
75 u64 entitlement;
76 u64 unallocated_entitlement;
77 u16 group_num;
78 u16 pool_num;
79 u8 capped;
80 u8 weight;
81 u8 unallocated_weight;
82 u16 active_procs_in_pool;
83 u16 active_system_procs;
84 u16 phys_platform_procs;
85 u32 max_proc_cap_avail;
86 u32 entitled_proc_cap_avail;
87};
88
89/*
90 * H_GET_PPP hcall returns info in 4 parms.
91 * entitled_capacity,unallocated_capacity,
92 * aggregation, resource_capability).
93 *
94 * R4 = Entitled Processor Capacity Percentage.
95 * R5 = Unallocated Processor Capacity Percentage.
96 * R6 (AABBCCDDEEFFGGHH).
97 * XXXX - reserved (0)
98 * XXXX - reserved (0)
99 * XXXX - Group Number
100 * XXXX - Pool Number.
101 * R7 (IIJJKKLLMMNNOOPP).
102 * XX - reserved. (0)
103 * XX - bit 0-6 reserved (0). bit 7 is Capped indicator.
104 * XX - variable processor Capacity Weight
105 * XX - Unallocated Variable Processor Capacity Weight.
106 * XXXX - Active processors in Physical Processor Pool.
107 * XXXX - Processors active on platform.
108 * R8 (QQQQRRRRRRSSSSSS). if ibm,partition-performance-parameters-level >= 1
109 * XXXX - Physical platform procs allocated to virtualization.
110 * XXXXXX - Max procs capacity % available to the partitions pool.
111 * XXXXXX - Entitled procs capacity % available to the
112 * partitions pool.
113 */
114static unsigned int h_get_ppp(struct hvcall_ppp_data *ppp_data)
115{
116 unsigned long rc;
117 unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];
118
119 rc = plpar_hcall9(H_GET_PPP, retbuf);
120
121 ppp_data->entitlement = retbuf[0];
122 ppp_data->unallocated_entitlement = retbuf[1];
123
124 ppp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff;
125 ppp_data->pool_num = retbuf[2] & 0xffff;
126
127 ppp_data->capped = (retbuf[3] >> 6 * 8) & 0x01;
128 ppp_data->weight = (retbuf[3] >> 5 * 8) & 0xff;
129 ppp_data->unallocated_weight = (retbuf[3] >> 4 * 8) & 0xff;
130 ppp_data->active_procs_in_pool = (retbuf[3] >> 2 * 8) & 0xffff;
131 ppp_data->active_system_procs = retbuf[3] & 0xffff;
132
133 ppp_data->phys_platform_procs = retbuf[4] >> 6 * 8;
134 ppp_data->max_proc_cap_avail = (retbuf[4] >> 3 * 8) & 0xffffff;
135 ppp_data->entitled_proc_cap_avail = retbuf[4] & 0xffffff;
136
137 return rc;
138}
139
140static void show_gpci_data(struct seq_file *m)
141{
142 struct hv_gpci_request_buffer *buf;
143 unsigned int affinity_score;
144 long ret;
145
146 buf = kmalloc(sizeof(*buf), GFP_KERNEL);
147 if (buf == NULL)
148 return;
149
150 /*
151 * Show the local LPAR's affinity score.
152 *
153 * 0xB1 selects the Affinity_Domain_Info_By_Partition subcall.
154 * The score is at byte 0xB in the output buffer.
155 */
156 memset(&buf->params, 0, sizeof(buf->params));
157 buf->params.counter_request = cpu_to_be32(0xB1);
158 buf->params.starting_index = cpu_to_be32(-1); /* local LPAR */
159 buf->params.counter_info_version_in = 0x5; /* v5+ for score */
160 ret = plpar_hcall_norets(H_GET_PERF_COUNTER_INFO, virt_to_phys(buf),
161 sizeof(*buf));
162 if (ret != H_SUCCESS) {
163 pr_debug("hcall failed: H_GET_PERF_COUNTER_INFO: %ld, %x\n",
164 ret, be32_to_cpu(buf->params.detail_rc));
165 goto out;
166 }
167 affinity_score = buf->bytes[0xB];
168 seq_printf(m, fmt: "partition_affinity_score=%u\n", affinity_score);
169out:
170 kfree(objp: buf);
171}
172
173static unsigned h_pic(unsigned long *pool_idle_time,
174 unsigned long *num_procs)
175{
176 unsigned long rc;
177 unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
178
179 rc = plpar_hcall(H_PIC, retbuf);
180
181 *pool_idle_time = retbuf[0];
182 *num_procs = retbuf[1];
183
184 return rc;
185}
186
187/*
188 * parse_ppp_data
189 * Parse out the data returned from h_get_ppp and h_pic
190 */
191static void parse_ppp_data(struct seq_file *m)
192{
193 struct hvcall_ppp_data ppp_data;
194 struct device_node *root;
195 const __be32 *perf_level;
196 int rc;
197
198 rc = h_get_ppp(ppp_data: &ppp_data);
199 if (rc)
200 return;
201
202 seq_printf(m, fmt: "partition_entitled_capacity=%lld\n",
203 ppp_data.entitlement);
204 seq_printf(m, fmt: "group=%d\n", ppp_data.group_num);
205 seq_printf(m, fmt: "system_active_processors=%d\n",
206 ppp_data.active_system_procs);
207
208 /* pool related entries are appropriate for shared configs */
209 if (lppaca_shared_proc()) {
210 unsigned long pool_idle_time, pool_procs;
211
212 seq_printf(m, fmt: "pool=%d\n", ppp_data.pool_num);
213
214 /* report pool_capacity in percentage */
215 seq_printf(m, fmt: "pool_capacity=%d\n",
216 ppp_data.active_procs_in_pool * 100);
217
218 h_pic(pool_idle_time: &pool_idle_time, num_procs: &pool_procs);
219 seq_printf(m, fmt: "pool_idle_time=%ld\n", pool_idle_time);
220 seq_printf(m, fmt: "pool_num_procs=%ld\n", pool_procs);
221 }
222
223 seq_printf(m, fmt: "unallocated_capacity_weight=%d\n",
224 ppp_data.unallocated_weight);
225 seq_printf(m, fmt: "capacity_weight=%d\n", ppp_data.weight);
226 seq_printf(m, fmt: "capped=%d\n", ppp_data.capped);
227 seq_printf(m, fmt: "unallocated_capacity=%lld\n",
228 ppp_data.unallocated_entitlement);
229
230 /* The last bits of information returned from h_get_ppp are only
231 * valid if the ibm,partition-performance-parameters-level
232 * property is >= 1.
233 */
234 root = of_find_node_by_path(path: "/");
235 if (root) {
236 perf_level = of_get_property(node: root,
237 name: "ibm,partition-performance-parameters-level",
238 NULL);
239 if (perf_level && (be32_to_cpup(p: perf_level) >= 1)) {
240 seq_printf(m,
241 fmt: "physical_procs_allocated_to_virtualization=%d\n",
242 ppp_data.phys_platform_procs);
243 seq_printf(m, fmt: "max_proc_capacity_available=%d\n",
244 ppp_data.max_proc_cap_avail);
245 seq_printf(m, fmt: "entitled_proc_capacity_available=%d\n",
246 ppp_data.entitled_proc_cap_avail);
247 }
248
249 of_node_put(node: root);
250 }
251}
252
253/**
254 * parse_mpp_data
255 * Parse out data returned from h_get_mpp
256 */
257static void parse_mpp_data(struct seq_file *m)
258{
259 struct hvcall_mpp_data mpp_data;
260 int rc;
261
262 rc = h_get_mpp(&mpp_data);
263 if (rc)
264 return;
265
266 seq_printf(m, fmt: "entitled_memory=%ld\n", mpp_data.entitled_mem);
267
268 if (mpp_data.mapped_mem != -1)
269 seq_printf(m, fmt: "mapped_entitled_memory=%ld\n",
270 mpp_data.mapped_mem);
271
272 seq_printf(m, fmt: "entitled_memory_group_number=%d\n", mpp_data.group_num);
273 seq_printf(m, fmt: "entitled_memory_pool_number=%d\n", mpp_data.pool_num);
274
275 seq_printf(m, fmt: "entitled_memory_weight=%d\n", mpp_data.mem_weight);
276 seq_printf(m, fmt: "unallocated_entitled_memory_weight=%d\n",
277 mpp_data.unallocated_mem_weight);
278 seq_printf(m, fmt: "unallocated_io_mapping_entitlement=%ld\n",
279 mpp_data.unallocated_entitlement);
280
281 if (mpp_data.pool_size != -1)
282 seq_printf(m, fmt: "entitled_memory_pool_size=%ld bytes\n",
283 mpp_data.pool_size);
284
285 seq_printf(m, fmt: "entitled_memory_loan_request=%ld\n",
286 mpp_data.loan_request);
287
288 seq_printf(m, fmt: "backing_memory=%ld bytes\n", mpp_data.backing_mem);
289}
290
291/**
292 * parse_mpp_x_data
293 * Parse out data returned from h_get_mpp_x
294 */
295static void parse_mpp_x_data(struct seq_file *m)
296{
297 struct hvcall_mpp_x_data mpp_x_data;
298
299 if (!firmware_has_feature(FW_FEATURE_XCMO))
300 return;
301 if (h_get_mpp_x(&mpp_x_data))
302 return;
303
304 seq_printf(m, fmt: "coalesced_bytes=%ld\n", mpp_x_data.coalesced_bytes);
305
306 if (mpp_x_data.pool_coalesced_bytes)
307 seq_printf(m, fmt: "pool_coalesced_bytes=%ld\n",
308 mpp_x_data.pool_coalesced_bytes);
309 if (mpp_x_data.pool_purr_cycles)
310 seq_printf(m, fmt: "coalesce_pool_purr=%ld\n", mpp_x_data.pool_purr_cycles);
311 if (mpp_x_data.pool_spurr_cycles)
312 seq_printf(m, fmt: "coalesce_pool_spurr=%ld\n", mpp_x_data.pool_spurr_cycles);
313}
314
315/*
316 * Read the lpar name using the RTAS ibm,get-system-parameter call.
317 *
318 * The name read through this call is updated if changes are made by the end
319 * user on the hypervisor side.
320 *
321 * Some hypervisor (like Qemu) may not provide this value. In that case, a non
322 * null value is returned.
323 */
324static int read_rtas_lpar_name(struct seq_file *m)
325{
326 struct papr_sysparm_buf *buf;
327 int err;
328
329 buf = papr_sysparm_buf_alloc();
330 if (!buf)
331 return -ENOMEM;
332
333 err = papr_sysparm_get(PAPR_SYSPARM_LPAR_NAME, buf);
334 if (!err)
335 seq_printf(m, fmt: "partition_name=%s\n", buf->val);
336
337 papr_sysparm_buf_free(buf);
338 return err;
339}
340
341/*
342 * Read the LPAR name from the Device Tree.
343 *
344 * The value read in the DT is not updated if the end-user is touching the LPAR
345 * name on the hypervisor side.
346 */
347static int read_dt_lpar_name(struct seq_file *m)
348{
349 struct device_node *root = of_find_node_by_path(path: "/");
350 const char *name;
351 int ret;
352
353 ret = of_property_read_string(np: root, propname: "ibm,partition-name", out_string: &name);
354 of_node_put(node: root);
355 if (ret)
356 return -ENOENT;
357
358 seq_printf(m, fmt: "partition_name=%s\n", name);
359 return 0;
360}
361
362static void read_lpar_name(struct seq_file *m)
363{
364 if (read_rtas_lpar_name(m) && read_dt_lpar_name(m))
365 pr_err_once("Error can't get the LPAR name");
366}
367
368#define SPLPAR_MAXLENGTH 1026*(sizeof(char))
369
370/*
371 * parse_system_parameter_string()
372 * Retrieve the potential_processors, max_entitled_capacity and friends
373 * through the get-system-parameter rtas call. Replace keyword strings as
374 * necessary.
375 */
376static void parse_system_parameter_string(struct seq_file *m)
377{
378 struct papr_sysparm_buf *buf;
379
380 buf = papr_sysparm_buf_alloc();
381 if (!buf)
382 return;
383
384 if (papr_sysparm_get(PAPR_SYSPARM_SHARED_PROC_LPAR_ATTRS, buf)) {
385 goto out_free;
386 } else {
387 const char *local_buffer;
388 int splpar_strlen;
389 int idx, w_idx;
390 char *workbuffer = kzalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
391
392 if (!workbuffer)
393 goto out_free;
394
395 splpar_strlen = be16_to_cpu(buf->len);
396 local_buffer = buf->val;
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, fmt: "%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(p: workbuffer,
417 q: "partition_max_entitled_capacity");
418 w_idx = strlen(workbuffer);
419 }
420 if (0 == strcmp(workbuffer, "MaxPlatProcs")) {
421 strcpy(p: workbuffer,
422 q: "system_potential_processors");
423 w_idx = strlen(workbuffer);
424 }
425 }
426 }
427 kfree(objp: workbuffer);
428 local_buffer -= 2; /* back up over strlen value */
429 }
430out_free:
431 papr_sysparm_buf_free(buf);
432}
433
434/* Return the number of processors in the system.
435 * This function reads through the device tree and counts
436 * the virtual processors, this does not include threads.
437 */
438static int lparcfg_count_active_processors(void)
439{
440 struct device_node *cpus_dn;
441 int count = 0;
442
443 for_each_node_by_type(cpus_dn, "cpu") {
444#ifdef LPARCFG_DEBUG
445 printk(KERN_ERR "cpus_dn %p\n", cpus_dn);
446#endif
447 count++;
448 }
449 return count;
450}
451
452static void pseries_cmo_data(struct seq_file *m)
453{
454 int cpu;
455 unsigned long cmo_faults = 0;
456 unsigned long cmo_fault_time = 0;
457
458 seq_printf(m, fmt: "cmo_enabled=%d\n", firmware_has_feature(FW_FEATURE_CMO));
459
460 if (!firmware_has_feature(FW_FEATURE_CMO))
461 return;
462
463 for_each_possible_cpu(cpu) {
464 cmo_faults += be64_to_cpu(lppaca_of(cpu).cmo_faults);
465 cmo_fault_time += be64_to_cpu(lppaca_of(cpu).cmo_fault_time);
466 }
467
468 seq_printf(m, fmt: "cmo_faults=%lu\n", cmo_faults);
469 seq_printf(m, fmt: "cmo_fault_time_usec=%lu\n",
470 cmo_fault_time / tb_ticks_per_usec);
471 seq_printf(m, fmt: "cmo_primary_psp=%d\n", cmo_get_primary_psp());
472 seq_printf(m, fmt: "cmo_secondary_psp=%d\n", cmo_get_secondary_psp());
473 seq_printf(m, fmt: "cmo_page_size=%lu\n", cmo_get_page_size());
474}
475
476static void splpar_dispatch_data(struct seq_file *m)
477{
478 int cpu;
479 unsigned long dispatches = 0;
480 unsigned long dispatch_dispersions = 0;
481
482 for_each_possible_cpu(cpu) {
483 dispatches += be32_to_cpu(lppaca_of(cpu).yield_count);
484 dispatch_dispersions +=
485 be32_to_cpu(lppaca_of(cpu).dispersion_count);
486 }
487
488 seq_printf(m, fmt: "dispatches=%lu\n", dispatches);
489 seq_printf(m, fmt: "dispatch_dispersions=%lu\n", dispatch_dispersions);
490}
491
492static void parse_em_data(struct seq_file *m)
493{
494 unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
495
496 if (firmware_has_feature(FW_FEATURE_LPAR) &&
497 plpar_hcall(H_GET_EM_PARMS, retbuf) == H_SUCCESS)
498 seq_printf(m, fmt: "power_mode_data=%016lx\n", retbuf[0]);
499}
500
501static void maxmem_data(struct seq_file *m)
502{
503 unsigned long maxmem = 0;
504
505 maxmem += (unsigned long)drmem_info->n_lmbs * drmem_info->lmb_size;
506 maxmem += hugetlb_total_pages() * PAGE_SIZE;
507
508 seq_printf(m, fmt: "MaxMem=%lu\n", maxmem);
509}
510
511static int pseries_lparcfg_data(struct seq_file *m, void *v)
512{
513 int partition_potential_processors;
514 int partition_active_processors;
515 struct device_node *rtas_node;
516 const __be32 *lrdrp = NULL;
517
518 rtas_node = of_find_node_by_path(path: "/rtas");
519 if (rtas_node)
520 lrdrp = of_get_property(node: rtas_node, name: "ibm,lrdr-capacity", NULL);
521
522 if (lrdrp == NULL) {
523 partition_potential_processors = vdso_data->processorCount;
524 } else {
525 partition_potential_processors = be32_to_cpup(p: lrdrp + 4);
526 }
527 of_node_put(node: rtas_node);
528
529 partition_active_processors = lparcfg_count_active_processors();
530
531 if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
532 /* this call handles the ibm,get-system-parameter contents */
533 read_lpar_name(m);
534 parse_system_parameter_string(m);
535 parse_ppp_data(m);
536 parse_mpp_data(m);
537 parse_mpp_x_data(m);
538 pseries_cmo_data(m);
539 splpar_dispatch_data(m);
540
541 seq_printf(m, fmt: "purr=%ld\n", get_purr());
542 seq_printf(m, fmt: "tbr=%ld\n", mftb());
543 } else { /* non SPLPAR case */
544
545 seq_printf(m, fmt: "system_active_processors=%d\n",
546 partition_potential_processors);
547
548 seq_printf(m, fmt: "system_potential_processors=%d\n",
549 partition_potential_processors);
550
551 seq_printf(m, fmt: "partition_max_entitled_capacity=%d\n",
552 partition_potential_processors * 100);
553
554 seq_printf(m, fmt: "partition_entitled_capacity=%d\n",
555 partition_active_processors * 100);
556 }
557
558 show_gpci_data(m);
559
560 seq_printf(m, fmt: "partition_active_processors=%d\n",
561 partition_active_processors);
562
563 seq_printf(m, fmt: "partition_potential_processors=%d\n",
564 partition_potential_processors);
565
566 seq_printf(m, fmt: "shared_processor_mode=%d\n",
567 lppaca_shared_proc());
568
569#ifdef CONFIG_PPC_64S_HASH_MMU
570 if (!radix_enabled())
571 seq_printf(m, "slb_size=%d\n", mmu_slb_size);
572#endif
573 parse_em_data(m);
574 maxmem_data(m);
575
576 seq_printf(m, fmt: "security_flavor=%u\n", pseries_security_flavor);
577
578 return 0;
579}
580
581static ssize_t update_ppp(u64 *entitlement, u8 *weight)
582{
583 struct hvcall_ppp_data ppp_data;
584 u8 new_weight;
585 u64 new_entitled;
586 ssize_t retval;
587
588 /* Get our current parameters */
589 retval = h_get_ppp(ppp_data: &ppp_data);
590 if (retval)
591 return retval;
592
593 if (entitlement) {
594 new_weight = ppp_data.weight;
595 new_entitled = *entitlement;
596 } else if (weight) {
597 new_weight = *weight;
598 new_entitled = ppp_data.entitlement;
599 } else
600 return -EINVAL;
601
602 pr_debug("%s: current_entitled = %llu, current_weight = %u\n",
603 __func__, ppp_data.entitlement, ppp_data.weight);
604
605 pr_debug("%s: new_entitled = %llu, new_weight = %u\n",
606 __func__, new_entitled, new_weight);
607
608 retval = plpar_hcall_norets(H_SET_PPP, new_entitled, new_weight);
609 return retval;
610}
611
612/**
613 * update_mpp
614 *
615 * Update the memory entitlement and weight for the partition. Caller must
616 * specify either a new entitlement or weight, not both, to be updated
617 * since the h_set_mpp call takes both entitlement and weight as parameters.
618 */
619static ssize_t update_mpp(u64 *entitlement, u8 *weight)
620{
621 struct hvcall_mpp_data mpp_data;
622 u64 new_entitled;
623 u8 new_weight;
624 ssize_t rc;
625
626 if (entitlement) {
627 /* Check with vio to ensure the new memory entitlement
628 * can be handled.
629 */
630 rc = vio_cmo_entitlement_update(*entitlement);
631 if (rc)
632 return rc;
633 }
634
635 rc = h_get_mpp(&mpp_data);
636 if (rc)
637 return rc;
638
639 if (entitlement) {
640 new_weight = mpp_data.mem_weight;
641 new_entitled = *entitlement;
642 } else if (weight) {
643 new_weight = *weight;
644 new_entitled = mpp_data.entitled_mem;
645 } else
646 return -EINVAL;
647
648 pr_debug("%s: current_entitled = %lu, current_weight = %u\n",
649 __func__, mpp_data.entitled_mem, mpp_data.mem_weight);
650
651 pr_debug("%s: new_entitled = %llu, new_weight = %u\n",
652 __func__, new_entitled, new_weight);
653
654 rc = plpar_hcall_norets(H_SET_MPP, new_entitled, new_weight);
655 return rc;
656}
657
658/*
659 * Interface for changing system parameters (variable capacity weight
660 * and entitled capacity). Format of input is "param_name=value";
661 * anything after value is ignored. Valid parameters at this time are
662 * "partition_entitled_capacity" and "capacity_weight". We use
663 * H_SET_PPP to alter parameters.
664 *
665 * This function should be invoked only on systems with
666 * FW_FEATURE_SPLPAR.
667 */
668static ssize_t lparcfg_write(struct file *file, const char __user * buf,
669 size_t count, loff_t * off)
670{
671 char kbuf[64];
672 char *tmp;
673 u64 new_entitled, *new_entitled_ptr = &new_entitled;
674 u8 new_weight, *new_weight_ptr = &new_weight;
675 ssize_t retval;
676
677 if (!firmware_has_feature(FW_FEATURE_SPLPAR))
678 return -EINVAL;
679
680 if (count > sizeof(kbuf))
681 return -EINVAL;
682
683 if (copy_from_user(to: kbuf, from: buf, n: count))
684 return -EFAULT;
685
686 kbuf[count - 1] = '\0';
687 tmp = strchr(kbuf, '=');
688 if (!tmp)
689 return -EINVAL;
690
691 *tmp++ = '\0';
692
693 if (!strcmp(kbuf, "partition_entitled_capacity")) {
694 char *endp;
695 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
696 if (endp == tmp)
697 return -EINVAL;
698
699 retval = update_ppp(entitlement: new_entitled_ptr, NULL);
700
701 if (retval == H_SUCCESS || retval == H_CONSTRAINED) {
702 /*
703 * The hypervisor assigns VAS resources based
704 * on entitled capacity for shared mode.
705 * Reconfig VAS windows based on DLPAR CPU events.
706 */
707 if (pseries_vas_dlpar_cpu() != 0)
708 retval = H_HARDWARE;
709 }
710 } else if (!strcmp(kbuf, "capacity_weight")) {
711 char *endp;
712 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
713 if (endp == tmp)
714 return -EINVAL;
715
716 retval = update_ppp(NULL, weight: new_weight_ptr);
717 } else if (!strcmp(kbuf, "entitled_memory")) {
718 char *endp;
719 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
720 if (endp == tmp)
721 return -EINVAL;
722
723 retval = update_mpp(entitlement: new_entitled_ptr, NULL);
724 } else if (!strcmp(kbuf, "entitled_memory_weight")) {
725 char *endp;
726 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
727 if (endp == tmp)
728 return -EINVAL;
729
730 retval = update_mpp(NULL, weight: new_weight_ptr);
731 } else
732 return -EINVAL;
733
734 if (retval == H_SUCCESS || retval == H_CONSTRAINED) {
735 retval = count;
736 } else if (retval == H_BUSY) {
737 retval = -EBUSY;
738 } else if (retval == H_HARDWARE) {
739 retval = -EIO;
740 } else if (retval == H_PARAMETER) {
741 retval = -EINVAL;
742 }
743
744 return retval;
745}
746
747static int lparcfg_data(struct seq_file *m, void *v)
748{
749 struct device_node *rootdn;
750 const char *model = "";
751 const char *system_id = "";
752 const char *tmp;
753 const __be32 *lp_index_ptr;
754 unsigned int lp_index = 0;
755
756 seq_printf(m, fmt: "%s %s\n", MODULE_NAME, MODULE_VERS);
757
758 rootdn = of_find_node_by_path(path: "/");
759 if (rootdn) {
760 tmp = of_get_property(node: rootdn, name: "model", NULL);
761 if (tmp)
762 model = tmp;
763 tmp = of_get_property(node: rootdn, name: "system-id", NULL);
764 if (tmp)
765 system_id = tmp;
766 lp_index_ptr = of_get_property(node: rootdn, name: "ibm,partition-no",
767 NULL);
768 if (lp_index_ptr)
769 lp_index = be32_to_cpup(p: lp_index_ptr);
770 of_node_put(node: rootdn);
771 }
772 seq_printf(m, fmt: "serial_number=%s\n", system_id);
773 seq_printf(m, fmt: "system_type=%s\n", model);
774 seq_printf(m, fmt: "partition_id=%d\n", (int)lp_index);
775
776 return pseries_lparcfg_data(m, v);
777}
778
779static int lparcfg_open(struct inode *inode, struct file *file)
780{
781 return single_open(file, lparcfg_data, NULL);
782}
783
784static const struct proc_ops lparcfg_proc_ops = {
785 .proc_read = seq_read,
786 .proc_write = lparcfg_write,
787 .proc_open = lparcfg_open,
788 .proc_release = single_release,
789 .proc_lseek = seq_lseek,
790};
791
792static int __init lparcfg_init(void)
793{
794 umode_t mode = 0444;
795
796 /* Allow writing if we have FW_FEATURE_SPLPAR */
797 if (firmware_has_feature(FW_FEATURE_SPLPAR))
798 mode |= 0200;
799
800 if (!proc_create(name: "powerpc/lparcfg", mode, NULL, proc_ops: &lparcfg_proc_ops)) {
801 printk(KERN_ERR "Failed to create powerpc/lparcfg\n");
802 return -EIO;
803 }
804 return 0;
805}
806machine_device_initcall(pseries, lparcfg_init);
807

source code of linux/arch/powerpc/platforms/pseries/lparcfg.c