Merge branch 'for-5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/dennis/percpu
[linux-2.6-microblaze.git] / arch / powerpc / platforms / pseries / lparcfg.c
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 <linux/seq_file.h>
23 #include <linux/slab.h>
24 #include <linux/uaccess.h>
25 #include <linux/hugetlb.h>
26 #include <asm/lppaca.h>
27 #include <asm/hvcall.h>
28 #include <asm/firmware.h>
29 #include <asm/rtas.h>
30 #include <asm/time.h>
31 #include <asm/prom.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
40 /*
41  * This isn't a module but we expose that to userspace
42  * via /proc so leave the definitions here
43  */
44 #define MODULE_VERS "1.9"
45 #define MODULE_NAME "lparcfg"
46
47 /* #define LPARCFG_DEBUG */
48
49 /*
50  * Track sum of all purrs across all processors. This is used to further
51  * calculate usage values by different applications
52  */
53 static void cpu_get_purr(void *arg)
54 {
55         atomic64_t *sum = arg;
56
57         atomic64_add(mfspr(SPRN_PURR), sum);
58 }
59
60 static unsigned long get_purr(void)
61 {
62         atomic64_t purr = ATOMIC64_INIT(0);
63
64         on_each_cpu(cpu_get_purr, &purr, 1);
65
66         return atomic64_read(&purr);
67 }
68
69 /*
70  * Methods used to fetch LPAR data when running on a pSeries platform.
71  */
72
73 struct hvcall_ppp_data {
74         u64     entitlement;
75         u64     unallocated_entitlement;
76         u16     group_num;
77         u16     pool_num;
78         u8      capped;
79         u8      weight;
80         u8      unallocated_weight;
81         u16     active_procs_in_pool;
82         u16     active_system_procs;
83         u16     phys_platform_procs;
84         u32     max_proc_cap_avail;
85         u32     entitled_proc_cap_avail;
86 };
87
88 /*
89  * H_GET_PPP hcall returns info in 4 parms.
90  *  entitled_capacity,unallocated_capacity,
91  *  aggregation, resource_capability).
92  *
93  *  R4 = Entitled Processor Capacity Percentage.
94  *  R5 = Unallocated Processor Capacity Percentage.
95  *  R6 (AABBCCDDEEFFGGHH).
96  *      XXXX - reserved (0)
97  *          XXXX - reserved (0)
98  *              XXXX - Group Number
99  *                  XXXX - Pool Number.
100  *  R7 (IIJJKKLLMMNNOOPP).
101  *      XX - reserved. (0)
102  *        XX - bit 0-6 reserved (0).   bit 7 is Capped indicator.
103  *          XX - variable processor Capacity Weight
104  *            XX - Unallocated Variable Processor Capacity Weight.
105  *              XXXX - Active processors in Physical Processor Pool.
106  *                  XXXX  - Processors active on platform.
107  *  R8 (QQQQRRRRRRSSSSSS). if ibm,partition-performance-parameters-level >= 1
108  *      XXXX - Physical platform procs allocated to virtualization.
109  *          XXXXXX - Max procs capacity % available to the partitions pool.
110  *                XXXXXX - Entitled procs capacity % available to the
111  *                         partitions pool.
112  */
113 static unsigned int h_get_ppp(struct hvcall_ppp_data *ppp_data)
114 {
115         unsigned long rc;
116         unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];
117
118         rc = plpar_hcall9(H_GET_PPP, retbuf);
119
120         ppp_data->entitlement = retbuf[0];
121         ppp_data->unallocated_entitlement = retbuf[1];
122
123         ppp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff;
124         ppp_data->pool_num = retbuf[2] & 0xffff;
125
126         ppp_data->capped = (retbuf[3] >> 6 * 8) & 0x01;
127         ppp_data->weight = (retbuf[3] >> 5 * 8) & 0xff;
128         ppp_data->unallocated_weight = (retbuf[3] >> 4 * 8) & 0xff;
129         ppp_data->active_procs_in_pool = (retbuf[3] >> 2 * 8) & 0xffff;
130         ppp_data->active_system_procs = retbuf[3] & 0xffff;
131
132         ppp_data->phys_platform_procs = retbuf[4] >> 6 * 8;
133         ppp_data->max_proc_cap_avail = (retbuf[4] >> 3 * 8) & 0xffffff;
134         ppp_data->entitled_proc_cap_avail = retbuf[4] & 0xffffff;
135
136         return rc;
137 }
138
139 static void show_gpci_data(struct seq_file *m)
140 {
141         struct hv_gpci_request_buffer *buf;
142         unsigned int affinity_score;
143         long ret;
144
145         buf = kmalloc(sizeof(*buf), GFP_KERNEL);
146         if (buf == NULL)
147                 return;
148
149         /*
150          * Show the local LPAR's affinity score.
151          *
152          * 0xB1 selects the Affinity_Domain_Info_By_Partition subcall.
153          * The score is at byte 0xB in the output buffer.
154          */
155         memset(&buf->params, 0, sizeof(buf->params));
156         buf->params.counter_request = cpu_to_be32(0xB1);
157         buf->params.starting_index = cpu_to_be32(-1);   /* local LPAR */
158         buf->params.counter_info_version_in = 0x5;      /* v5+ for score */
159         ret = plpar_hcall_norets(H_GET_PERF_COUNTER_INFO, virt_to_phys(buf),
160                                  sizeof(*buf));
161         if (ret != H_SUCCESS) {
162                 pr_debug("hcall failed: H_GET_PERF_COUNTER_INFO: %ld, %x\n",
163                          ret, be32_to_cpu(buf->params.detail_rc));
164                 goto out;
165         }
166         affinity_score = buf->bytes[0xB];
167         seq_printf(m, "partition_affinity_score=%u\n", affinity_score);
168 out:
169         kfree(buf);
170 }
171
172 static unsigned h_pic(unsigned long *pool_idle_time,
173                       unsigned long *num_procs)
174 {
175         unsigned long rc;
176         unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
177
178         rc = plpar_hcall(H_PIC, retbuf);
179
180         *pool_idle_time = retbuf[0];
181         *num_procs = retbuf[1];
182
183         return rc;
184 }
185
186 /*
187  * parse_ppp_data
188  * Parse out the data returned from h_get_ppp and h_pic
189  */
190 static void parse_ppp_data(struct seq_file *m)
191 {
192         struct hvcall_ppp_data ppp_data;
193         struct device_node *root;
194         const __be32 *perf_level;
195         int rc;
196
197         rc = h_get_ppp(&ppp_data);
198         if (rc)
199                 return;
200
201         seq_printf(m, "partition_entitled_capacity=%lld\n",
202                    ppp_data.entitlement);
203         seq_printf(m, "group=%d\n", ppp_data.group_num);
204         seq_printf(m, "system_active_processors=%d\n",
205                    ppp_data.active_system_procs);
206
207         /* pool related entries are appropriate for shared configs */
208         if (lppaca_shared_proc(get_lppaca())) {
209                 unsigned long pool_idle_time, pool_procs;
210
211                 seq_printf(m, "pool=%d\n", ppp_data.pool_num);
212
213                 /* report pool_capacity in percentage */
214                 seq_printf(m, "pool_capacity=%d\n",
215                            ppp_data.active_procs_in_pool * 100);
216
217                 h_pic(&pool_idle_time, &pool_procs);
218                 seq_printf(m, "pool_idle_time=%ld\n", pool_idle_time);
219                 seq_printf(m, "pool_num_procs=%ld\n", pool_procs);
220         }
221
222         seq_printf(m, "unallocated_capacity_weight=%d\n",
223                    ppp_data.unallocated_weight);
224         seq_printf(m, "capacity_weight=%d\n", ppp_data.weight);
225         seq_printf(m, "capped=%d\n", ppp_data.capped);
226         seq_printf(m, "unallocated_capacity=%lld\n",
227                    ppp_data.unallocated_entitlement);
228
229         /* The last bits of information returned from h_get_ppp are only
230          * valid if the ibm,partition-performance-parameters-level
231          * property is >= 1.
232          */
233         root = of_find_node_by_path("/");
234         if (root) {
235                 perf_level = of_get_property(root,
236                                 "ibm,partition-performance-parameters-level",
237                                              NULL);
238                 if (perf_level && (be32_to_cpup(perf_level) >= 1)) {
239                         seq_printf(m,
240                             "physical_procs_allocated_to_virtualization=%d\n",
241                                    ppp_data.phys_platform_procs);
242                         seq_printf(m, "max_proc_capacity_available=%d\n",
243                                    ppp_data.max_proc_cap_avail);
244                         seq_printf(m, "entitled_proc_capacity_available=%d\n",
245                                    ppp_data.entitled_proc_cap_avail);
246                 }
247
248                 of_node_put(root);
249         }
250 }
251
252 /**
253  * parse_mpp_data
254  * Parse out data returned from h_get_mpp
255  */
256 static void parse_mpp_data(struct seq_file *m)
257 {
258         struct hvcall_mpp_data mpp_data;
259         int rc;
260
261         rc = h_get_mpp(&mpp_data);
262         if (rc)
263                 return;
264
265         seq_printf(m, "entitled_memory=%ld\n", mpp_data.entitled_mem);
266
267         if (mpp_data.mapped_mem != -1)
268                 seq_printf(m, "mapped_entitled_memory=%ld\n",
269                            mpp_data.mapped_mem);
270
271         seq_printf(m, "entitled_memory_group_number=%d\n", mpp_data.group_num);
272         seq_printf(m, "entitled_memory_pool_number=%d\n", mpp_data.pool_num);
273
274         seq_printf(m, "entitled_memory_weight=%d\n", mpp_data.mem_weight);
275         seq_printf(m, "unallocated_entitled_memory_weight=%d\n",
276                    mpp_data.unallocated_mem_weight);
277         seq_printf(m, "unallocated_io_mapping_entitlement=%ld\n",
278                    mpp_data.unallocated_entitlement);
279
280         if (mpp_data.pool_size != -1)
281                 seq_printf(m, "entitled_memory_pool_size=%ld bytes\n",
282                            mpp_data.pool_size);
283
284         seq_printf(m, "entitled_memory_loan_request=%ld\n",
285                    mpp_data.loan_request);
286
287         seq_printf(m, "backing_memory=%ld bytes\n", mpp_data.backing_mem);
288 }
289
290 /**
291  * parse_mpp_x_data
292  * Parse out data returned from h_get_mpp_x
293  */
294 static void parse_mpp_x_data(struct seq_file *m)
295 {
296         struct hvcall_mpp_x_data mpp_x_data;
297
298         if (!firmware_has_feature(FW_FEATURE_XCMO))
299                 return;
300         if (h_get_mpp_x(&mpp_x_data))
301                 return;
302
303         seq_printf(m, "coalesced_bytes=%ld\n", mpp_x_data.coalesced_bytes);
304
305         if (mpp_x_data.pool_coalesced_bytes)
306                 seq_printf(m, "pool_coalesced_bytes=%ld\n",
307                            mpp_x_data.pool_coalesced_bytes);
308         if (mpp_x_data.pool_purr_cycles)
309                 seq_printf(m, "coalesce_pool_purr=%ld\n", mpp_x_data.pool_purr_cycles);
310         if (mpp_x_data.pool_spurr_cycles)
311                 seq_printf(m, "coalesce_pool_spurr=%ld\n", mpp_x_data.pool_spurr_cycles);
312 }
313
314 #define SPLPAR_CHARACTERISTICS_TOKEN 20
315 #define SPLPAR_MAXLENGTH 1026*(sizeof(char))
316
317 /*
318  * parse_system_parameter_string()
319  * Retrieve the potential_processors, max_entitled_capacity and friends
320  * through the get-system-parameter rtas call.  Replace keyword strings as
321  * necessary.
322  */
323 static void parse_system_parameter_string(struct seq_file *m)
324 {
325         int call_status;
326
327         unsigned char *local_buffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
328         if (!local_buffer) {
329                 printk(KERN_ERR "%s %s kmalloc failure at line %d\n",
330                        __FILE__, __func__, __LINE__);
331                 return;
332         }
333
334         spin_lock(&rtas_data_buf_lock);
335         memset(rtas_data_buf, 0, SPLPAR_MAXLENGTH);
336         call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
337                                 NULL,
338                                 SPLPAR_CHARACTERISTICS_TOKEN,
339                                 __pa(rtas_data_buf),
340                                 RTAS_DATA_BUF_SIZE);
341         memcpy(local_buffer, rtas_data_buf, SPLPAR_MAXLENGTH);
342         local_buffer[SPLPAR_MAXLENGTH - 1] = '\0';
343         spin_unlock(&rtas_data_buf_lock);
344
345         if (call_status != 0) {
346                 printk(KERN_INFO
347                        "%s %s Error calling get-system-parameter (0x%x)\n",
348                        __FILE__, __func__, call_status);
349         } else {
350                 int splpar_strlen;
351                 int idx, w_idx;
352                 char *workbuffer = kzalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
353                 if (!workbuffer) {
354                         printk(KERN_ERR "%s %s kmalloc failure at line %d\n",
355                                __FILE__, __func__, __LINE__);
356                         kfree(local_buffer);
357                         return;
358                 }
359 #ifdef LPARCFG_DEBUG
360                 printk(KERN_INFO "success calling get-system-parameter\n");
361 #endif
362                 splpar_strlen = local_buffer[0] * 256 + local_buffer[1];
363                 local_buffer += 2;      /* step over strlen value */
364
365                 w_idx = 0;
366                 idx = 0;
367                 while ((*local_buffer) && (idx < splpar_strlen)) {
368                         workbuffer[w_idx++] = local_buffer[idx++];
369                         if ((local_buffer[idx] == ',')
370                             || (local_buffer[idx] == '\0')) {
371                                 workbuffer[w_idx] = '\0';
372                                 if (w_idx) {
373                                         /* avoid the empty string */
374                                         seq_printf(m, "%s\n", workbuffer);
375                                 }
376                                 memset(workbuffer, 0, SPLPAR_MAXLENGTH);
377                                 idx++;  /* skip the comma */
378                                 w_idx = 0;
379                         } else if (local_buffer[idx] == '=') {
380                                 /* code here to replace workbuffer contents
381                                    with different keyword strings */
382                                 if (0 == strcmp(workbuffer, "MaxEntCap")) {
383                                         strcpy(workbuffer,
384                                                "partition_max_entitled_capacity");
385                                         w_idx = strlen(workbuffer);
386                                 }
387                                 if (0 == strcmp(workbuffer, "MaxPlatProcs")) {
388                                         strcpy(workbuffer,
389                                                "system_potential_processors");
390                                         w_idx = strlen(workbuffer);
391                                 }
392                         }
393                 }
394                 kfree(workbuffer);
395                 local_buffer -= 2;      /* back up over strlen value */
396         }
397         kfree(local_buffer);
398 }
399
400 /* Return the number of processors in the system.
401  * This function reads through the device tree and counts
402  * the virtual processors, this does not include threads.
403  */
404 static int lparcfg_count_active_processors(void)
405 {
406         struct device_node *cpus_dn;
407         int count = 0;
408
409         for_each_node_by_type(cpus_dn, "cpu") {
410 #ifdef LPARCFG_DEBUG
411                 printk(KERN_ERR "cpus_dn %p\n", cpus_dn);
412 #endif
413                 count++;
414         }
415         return count;
416 }
417
418 static void pseries_cmo_data(struct seq_file *m)
419 {
420         int cpu;
421         unsigned long cmo_faults = 0;
422         unsigned long cmo_fault_time = 0;
423
424         seq_printf(m, "cmo_enabled=%d\n", firmware_has_feature(FW_FEATURE_CMO));
425
426         if (!firmware_has_feature(FW_FEATURE_CMO))
427                 return;
428
429         for_each_possible_cpu(cpu) {
430                 cmo_faults += be64_to_cpu(lppaca_of(cpu).cmo_faults);
431                 cmo_fault_time += be64_to_cpu(lppaca_of(cpu).cmo_fault_time);
432         }
433
434         seq_printf(m, "cmo_faults=%lu\n", cmo_faults);
435         seq_printf(m, "cmo_fault_time_usec=%lu\n",
436                    cmo_fault_time / tb_ticks_per_usec);
437         seq_printf(m, "cmo_primary_psp=%d\n", cmo_get_primary_psp());
438         seq_printf(m, "cmo_secondary_psp=%d\n", cmo_get_secondary_psp());
439         seq_printf(m, "cmo_page_size=%lu\n", cmo_get_page_size());
440 }
441
442 static void splpar_dispatch_data(struct seq_file *m)
443 {
444         int cpu;
445         unsigned long dispatches = 0;
446         unsigned long dispatch_dispersions = 0;
447
448         for_each_possible_cpu(cpu) {
449                 dispatches += be32_to_cpu(lppaca_of(cpu).yield_count);
450                 dispatch_dispersions +=
451                         be32_to_cpu(lppaca_of(cpu).dispersion_count);
452         }
453
454         seq_printf(m, "dispatches=%lu\n", dispatches);
455         seq_printf(m, "dispatch_dispersions=%lu\n", dispatch_dispersions);
456 }
457
458 static void parse_em_data(struct seq_file *m)
459 {
460         unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
461
462         if (firmware_has_feature(FW_FEATURE_LPAR) &&
463             plpar_hcall(H_GET_EM_PARMS, retbuf) == H_SUCCESS)
464                 seq_printf(m, "power_mode_data=%016lx\n", retbuf[0]);
465 }
466
467 static void maxmem_data(struct seq_file *m)
468 {
469         unsigned long maxmem = 0;
470
471         maxmem += (unsigned long)drmem_info->n_lmbs * drmem_info->lmb_size;
472         maxmem += hugetlb_total_pages() * PAGE_SIZE;
473
474         seq_printf(m, "MaxMem=%lu\n", maxmem);
475 }
476
477 static int pseries_lparcfg_data(struct seq_file *m, void *v)
478 {
479         int partition_potential_processors;
480         int partition_active_processors;
481         struct device_node *rtas_node;
482         const __be32 *lrdrp = NULL;
483
484         rtas_node = of_find_node_by_path("/rtas");
485         if (rtas_node)
486                 lrdrp = of_get_property(rtas_node, "ibm,lrdr-capacity", NULL);
487
488         if (lrdrp == NULL) {
489                 partition_potential_processors = vdso_data->processorCount;
490         } else {
491                 partition_potential_processors = be32_to_cpup(lrdrp + 4);
492         }
493         of_node_put(rtas_node);
494
495         partition_active_processors = lparcfg_count_active_processors();
496
497         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
498                 /* this call handles the ibm,get-system-parameter contents */
499                 parse_system_parameter_string(m);
500                 parse_ppp_data(m);
501                 parse_mpp_data(m);
502                 parse_mpp_x_data(m);
503                 pseries_cmo_data(m);
504                 splpar_dispatch_data(m);
505
506                 seq_printf(m, "purr=%ld\n", get_purr());
507                 seq_printf(m, "tbr=%ld\n", mftb());
508         } else {                /* non SPLPAR case */
509
510                 seq_printf(m, "system_active_processors=%d\n",
511                            partition_potential_processors);
512
513                 seq_printf(m, "system_potential_processors=%d\n",
514                            partition_potential_processors);
515
516                 seq_printf(m, "partition_max_entitled_capacity=%d\n",
517                            partition_potential_processors * 100);
518
519                 seq_printf(m, "partition_entitled_capacity=%d\n",
520                            partition_active_processors * 100);
521         }
522
523         show_gpci_data(m);
524
525         seq_printf(m, "partition_active_processors=%d\n",
526                    partition_active_processors);
527
528         seq_printf(m, "partition_potential_processors=%d\n",
529                    partition_potential_processors);
530
531         seq_printf(m, "shared_processor_mode=%d\n",
532                    lppaca_shared_proc(get_lppaca()));
533
534 #ifdef CONFIG_PPC_BOOK3S_64
535         seq_printf(m, "slb_size=%d\n", mmu_slb_size);
536 #endif
537         parse_em_data(m);
538         maxmem_data(m);
539
540         seq_printf(m, "security_flavor=%u\n", pseries_security_flavor);
541
542         return 0;
543 }
544
545 static ssize_t update_ppp(u64 *entitlement, u8 *weight)
546 {
547         struct hvcall_ppp_data ppp_data;
548         u8 new_weight;
549         u64 new_entitled;
550         ssize_t retval;
551
552         /* Get our current parameters */
553         retval = h_get_ppp(&ppp_data);
554         if (retval)
555                 return retval;
556
557         if (entitlement) {
558                 new_weight = ppp_data.weight;
559                 new_entitled = *entitlement;
560         } else if (weight) {
561                 new_weight = *weight;
562                 new_entitled = ppp_data.entitlement;
563         } else
564                 return -EINVAL;
565
566         pr_debug("%s: current_entitled = %llu, current_weight = %u\n",
567                  __func__, ppp_data.entitlement, ppp_data.weight);
568
569         pr_debug("%s: new_entitled = %llu, new_weight = %u\n",
570                  __func__, new_entitled, new_weight);
571
572         retval = plpar_hcall_norets(H_SET_PPP, new_entitled, new_weight);
573         return retval;
574 }
575
576 /**
577  * update_mpp
578  *
579  * Update the memory entitlement and weight for the partition.  Caller must
580  * specify either a new entitlement or weight, not both, to be updated
581  * since the h_set_mpp call takes both entitlement and weight as parameters.
582  */
583 static ssize_t update_mpp(u64 *entitlement, u8 *weight)
584 {
585         struct hvcall_mpp_data mpp_data;
586         u64 new_entitled;
587         u8 new_weight;
588         ssize_t rc;
589
590         if (entitlement) {
591                 /* Check with vio to ensure the new memory entitlement
592                  * can be handled.
593                  */
594                 rc = vio_cmo_entitlement_update(*entitlement);
595                 if (rc)
596                         return rc;
597         }
598
599         rc = h_get_mpp(&mpp_data);
600         if (rc)
601                 return rc;
602
603         if (entitlement) {
604                 new_weight = mpp_data.mem_weight;
605                 new_entitled = *entitlement;
606         } else if (weight) {
607                 new_weight = *weight;
608                 new_entitled = mpp_data.entitled_mem;
609         } else
610                 return -EINVAL;
611
612         pr_debug("%s: current_entitled = %lu, current_weight = %u\n",
613                  __func__, mpp_data.entitled_mem, mpp_data.mem_weight);
614
615         pr_debug("%s: new_entitled = %llu, new_weight = %u\n",
616                  __func__, new_entitled, new_weight);
617
618         rc = plpar_hcall_norets(H_SET_MPP, new_entitled, new_weight);
619         return rc;
620 }
621
622 /*
623  * Interface for changing system parameters (variable capacity weight
624  * and entitled capacity).  Format of input is "param_name=value";
625  * anything after value is ignored.  Valid parameters at this time are
626  * "partition_entitled_capacity" and "capacity_weight".  We use
627  * H_SET_PPP to alter parameters.
628  *
629  * This function should be invoked only on systems with
630  * FW_FEATURE_SPLPAR.
631  */
632 static ssize_t lparcfg_write(struct file *file, const char __user * buf,
633                              size_t count, loff_t * off)
634 {
635         char kbuf[64];
636         char *tmp;
637         u64 new_entitled, *new_entitled_ptr = &new_entitled;
638         u8 new_weight, *new_weight_ptr = &new_weight;
639         ssize_t retval;
640
641         if (!firmware_has_feature(FW_FEATURE_SPLPAR))
642                 return -EINVAL;
643
644         if (count > sizeof(kbuf))
645                 return -EINVAL;
646
647         if (copy_from_user(kbuf, buf, count))
648                 return -EFAULT;
649
650         kbuf[count - 1] = '\0';
651         tmp = strchr(kbuf, '=');
652         if (!tmp)
653                 return -EINVAL;
654
655         *tmp++ = '\0';
656
657         if (!strcmp(kbuf, "partition_entitled_capacity")) {
658                 char *endp;
659                 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
660                 if (endp == tmp)
661                         return -EINVAL;
662
663                 retval = update_ppp(new_entitled_ptr, NULL);
664         } else if (!strcmp(kbuf, "capacity_weight")) {
665                 char *endp;
666                 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
667                 if (endp == tmp)
668                         return -EINVAL;
669
670                 retval = update_ppp(NULL, new_weight_ptr);
671         } else if (!strcmp(kbuf, "entitled_memory")) {
672                 char *endp;
673                 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
674                 if (endp == tmp)
675                         return -EINVAL;
676
677                 retval = update_mpp(new_entitled_ptr, NULL);
678         } else if (!strcmp(kbuf, "entitled_memory_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_mpp(NULL, new_weight_ptr);
685         } else
686                 return -EINVAL;
687
688         if (retval == H_SUCCESS || retval == H_CONSTRAINED) {
689                 retval = count;
690         } else if (retval == H_BUSY) {
691                 retval = -EBUSY;
692         } else if (retval == H_HARDWARE) {
693                 retval = -EIO;
694         } else if (retval == H_PARAMETER) {
695                 retval = -EINVAL;
696         }
697
698         return retval;
699 }
700
701 static int lparcfg_data(struct seq_file *m, void *v)
702 {
703         struct device_node *rootdn;
704         const char *model = "";
705         const char *system_id = "";
706         const char *tmp;
707         const __be32 *lp_index_ptr;
708         unsigned int lp_index = 0;
709
710         seq_printf(m, "%s %s\n", MODULE_NAME, MODULE_VERS);
711
712         rootdn = of_find_node_by_path("/");
713         if (rootdn) {
714                 tmp = of_get_property(rootdn, "model", NULL);
715                 if (tmp)
716                         model = tmp;
717                 tmp = of_get_property(rootdn, "system-id", NULL);
718                 if (tmp)
719                         system_id = tmp;
720                 lp_index_ptr = of_get_property(rootdn, "ibm,partition-no",
721                                         NULL);
722                 if (lp_index_ptr)
723                         lp_index = be32_to_cpup(lp_index_ptr);
724                 of_node_put(rootdn);
725         }
726         seq_printf(m, "serial_number=%s\n", system_id);
727         seq_printf(m, "system_type=%s\n", model);
728         seq_printf(m, "partition_id=%d\n", (int)lp_index);
729
730         return pseries_lparcfg_data(m, v);
731 }
732
733 static int lparcfg_open(struct inode *inode, struct file *file)
734 {
735         return single_open(file, lparcfg_data, NULL);
736 }
737
738 static const struct proc_ops lparcfg_proc_ops = {
739         .proc_read      = seq_read,
740         .proc_write     = lparcfg_write,
741         .proc_open      = lparcfg_open,
742         .proc_release   = single_release,
743         .proc_lseek     = seq_lseek,
744 };
745
746 static int __init lparcfg_init(void)
747 {
748         umode_t mode = 0444;
749
750         /* Allow writing if we have FW_FEATURE_SPLPAR */
751         if (firmware_has_feature(FW_FEATURE_SPLPAR))
752                 mode |= 0200;
753
754         if (!proc_create("powerpc/lparcfg", mode, NULL, &lparcfg_proc_ops)) {
755                 printk(KERN_ERR "Failed to create powerpc/lparcfg\n");
756                 return -EIO;
757         }
758         return 0;
759 }
760 machine_device_initcall(pseries, lparcfg_init);