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TOMOYO Linux Cross Reference
Linux/arch/powerpc/platforms/pseries/lparcfg.c

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  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 <linux/uaccess.h>
 29 #include <asm/lppaca.h>
 30 #include <asm/hvcall.h>
 31 #include <asm/firmware.h>
 32 #include <asm/rtas.h>
 33 #include <asm/time.h>
 34 #include <asm/prom.h>
 35 #include <asm/vdso_datapage.h>
 36 #include <asm/vio.h>
 37 #include <asm/mmu.h>
 38 #include <asm/machdep.h>
 39 
 40 #include "pseries.h"
 41 
 42 /*
 43  * This isn't a module but we expose that to userspace
 44  * via /proc so leave the definitions here
 45  */
 46 #define MODULE_VERS "1.9"
 47 #define MODULE_NAME "lparcfg"
 48 
 49 /* #define LPARCFG_DEBUG */
 50 
 51 /*
 52  * Track sum of all purrs across all processors. This is used to further
 53  * calculate usage values by different applications
 54  */
 55 static unsigned long get_purr(void)
 56 {
 57         unsigned long sum_purr = 0;
 58         int cpu;
 59 
 60         for_each_possible_cpu(cpu) {
 61                 struct cpu_usage *cu;
 62 
 63                 cu = &per_cpu(cpu_usage_array, cpu);
 64                 sum_purr += cu->current_tb;
 65         }
 66         return sum_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 unsigned h_pic(unsigned long *pool_idle_time,
140                       unsigned long *num_procs)
141 {
142         unsigned long rc;
143         unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
144 
145         rc = plpar_hcall(H_PIC, retbuf);
146 
147         *pool_idle_time = retbuf[0];
148         *num_procs = retbuf[1];
149 
150         return rc;
151 }
152 
153 /*
154  * parse_ppp_data
155  * Parse out the data returned from h_get_ppp and h_pic
156  */
157 static void parse_ppp_data(struct seq_file *m)
158 {
159         struct hvcall_ppp_data ppp_data;
160         struct device_node *root;
161         const __be32 *perf_level;
162         int rc;
163 
164         rc = h_get_ppp(&ppp_data);
165         if (rc)
166                 return;
167 
168         seq_printf(m, "partition_entitled_capacity=%lld\n",
169                    ppp_data.entitlement);
170         seq_printf(m, "group=%d\n", ppp_data.group_num);
171         seq_printf(m, "system_active_processors=%d\n",
172                    ppp_data.active_system_procs);
173 
174         /* pool related entries are appropriate for shared configs */
175         if (lppaca_shared_proc(get_lppaca())) {
176                 unsigned long pool_idle_time, pool_procs;
177 
178                 seq_printf(m, "pool=%d\n", ppp_data.pool_num);
179 
180                 /* report pool_capacity in percentage */
181                 seq_printf(m, "pool_capacity=%d\n",
182                            ppp_data.active_procs_in_pool * 100);
183 
184                 h_pic(&pool_idle_time, &pool_procs);
185                 seq_printf(m, "pool_idle_time=%ld\n", pool_idle_time);
186                 seq_printf(m, "pool_num_procs=%ld\n", pool_procs);
187         }
188 
189         seq_printf(m, "unallocated_capacity_weight=%d\n",
190                    ppp_data.unallocated_weight);
191         seq_printf(m, "capacity_weight=%d\n", ppp_data.weight);
192         seq_printf(m, "capped=%d\n", ppp_data.capped);
193         seq_printf(m, "unallocated_capacity=%lld\n",
194                    ppp_data.unallocated_entitlement);
195 
196         /* The last bits of information returned from h_get_ppp are only
197          * valid if the ibm,partition-performance-parameters-level
198          * property is >= 1.
199          */
200         root = of_find_node_by_path("/");
201         if (root) {
202                 perf_level = of_get_property(root,
203                                 "ibm,partition-performance-parameters-level",
204                                              NULL);
205                 if (perf_level && (be32_to_cpup(perf_level) >= 1)) {
206                         seq_printf(m,
207                             "physical_procs_allocated_to_virtualization=%d\n",
208                                    ppp_data.phys_platform_procs);
209                         seq_printf(m, "max_proc_capacity_available=%d\n",
210                                    ppp_data.max_proc_cap_avail);
211                         seq_printf(m, "entitled_proc_capacity_available=%d\n",
212                                    ppp_data.entitled_proc_cap_avail);
213                 }
214 
215                 of_node_put(root);
216         }
217 }
218 
219 /**
220  * parse_mpp_data
221  * Parse out data returned from h_get_mpp
222  */
223 static void parse_mpp_data(struct seq_file *m)
224 {
225         struct hvcall_mpp_data mpp_data;
226         int rc;
227 
228         rc = h_get_mpp(&mpp_data);
229         if (rc)
230                 return;
231 
232         seq_printf(m, "entitled_memory=%ld\n", mpp_data.entitled_mem);
233 
234         if (mpp_data.mapped_mem != -1)
235                 seq_printf(m, "mapped_entitled_memory=%ld\n",
236                            mpp_data.mapped_mem);
237 
238         seq_printf(m, "entitled_memory_group_number=%d\n", mpp_data.group_num);
239         seq_printf(m, "entitled_memory_pool_number=%d\n", mpp_data.pool_num);
240 
241         seq_printf(m, "entitled_memory_weight=%d\n", mpp_data.mem_weight);
242         seq_printf(m, "unallocated_entitled_memory_weight=%d\n",
243                    mpp_data.unallocated_mem_weight);
244         seq_printf(m, "unallocated_io_mapping_entitlement=%ld\n",
245                    mpp_data.unallocated_entitlement);
246 
247         if (mpp_data.pool_size != -1)
248                 seq_printf(m, "entitled_memory_pool_size=%ld bytes\n",
249                            mpp_data.pool_size);
250 
251         seq_printf(m, "entitled_memory_loan_request=%ld\n",
252                    mpp_data.loan_request);
253 
254         seq_printf(m, "backing_memory=%ld bytes\n", mpp_data.backing_mem);
255 }
256 
257 /**
258  * parse_mpp_x_data
259  * Parse out data returned from h_get_mpp_x
260  */
261 static void parse_mpp_x_data(struct seq_file *m)
262 {
263         struct hvcall_mpp_x_data mpp_x_data;
264 
265         if (!firmware_has_feature(FW_FEATURE_XCMO))
266                 return;
267         if (h_get_mpp_x(&mpp_x_data))
268                 return;
269 
270         seq_printf(m, "coalesced_bytes=%ld\n", mpp_x_data.coalesced_bytes);
271 
272         if (mpp_x_data.pool_coalesced_bytes)
273                 seq_printf(m, "pool_coalesced_bytes=%ld\n",
274                            mpp_x_data.pool_coalesced_bytes);
275         if (mpp_x_data.pool_purr_cycles)
276                 seq_printf(m, "coalesce_pool_purr=%ld\n", mpp_x_data.pool_purr_cycles);
277         if (mpp_x_data.pool_spurr_cycles)
278                 seq_printf(m, "coalesce_pool_spurr=%ld\n", mpp_x_data.pool_spurr_cycles);
279 }
280 
281 #define SPLPAR_CHARACTERISTICS_TOKEN 20
282 #define SPLPAR_MAXLENGTH 1026*(sizeof(char))
283 
284 /*
285  * parse_system_parameter_string()
286  * Retrieve the potential_processors, max_entitled_capacity and friends
287  * through the get-system-parameter rtas call.  Replace keyword strings as
288  * necessary.
289  */
290 static void parse_system_parameter_string(struct seq_file *m)
291 {
292         int call_status;
293 
294         unsigned char *local_buffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
295         if (!local_buffer) {
296                 printk(KERN_ERR "%s %s kmalloc failure at line %d\n",
297                        __FILE__, __func__, __LINE__);
298                 return;
299         }
300 
301         spin_lock(&rtas_data_buf_lock);
302         memset(rtas_data_buf, 0, SPLPAR_MAXLENGTH);
303         call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
304                                 NULL,
305                                 SPLPAR_CHARACTERISTICS_TOKEN,
306                                 __pa(rtas_data_buf),
307                                 RTAS_DATA_BUF_SIZE);
308         memcpy(local_buffer, rtas_data_buf, SPLPAR_MAXLENGTH);
309         local_buffer[SPLPAR_MAXLENGTH - 1] = '\0';
310         spin_unlock(&rtas_data_buf_lock);
311 
312         if (call_status != 0) {
313                 printk(KERN_INFO
314                        "%s %s Error calling get-system-parameter (0x%x)\n",
315                        __FILE__, __func__, call_status);
316         } else {
317                 int splpar_strlen;
318                 int idx, w_idx;
319                 char *workbuffer = kzalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
320                 if (!workbuffer) {
321                         printk(KERN_ERR "%s %s kmalloc failure at line %d\n",
322                                __FILE__, __func__, __LINE__);
323                         kfree(local_buffer);
324                         return;
325                 }
326 #ifdef LPARCFG_DEBUG
327                 printk(KERN_INFO "success calling get-system-parameter\n");
328 #endif
329                 splpar_strlen = local_buffer[0] * 256 + local_buffer[1];
330                 local_buffer += 2;      /* step over strlen value */
331 
332                 w_idx = 0;
333                 idx = 0;
334                 while ((*local_buffer) && (idx < splpar_strlen)) {
335                         workbuffer[w_idx++] = local_buffer[idx++];
336                         if ((local_buffer[idx] == ',')
337                             || (local_buffer[idx] == '\0')) {
338                                 workbuffer[w_idx] = '\0';
339                                 if (w_idx) {
340                                         /* avoid the empty string */
341                                         seq_printf(m, "%s\n", workbuffer);
342                                 }
343                                 memset(workbuffer, 0, SPLPAR_MAXLENGTH);
344                                 idx++;  /* skip the comma */
345                                 w_idx = 0;
346                         } else if (local_buffer[idx] == '=') {
347                                 /* code here to replace workbuffer contents
348                                    with different keyword strings */
349                                 if (0 == strcmp(workbuffer, "MaxEntCap")) {
350                                         strcpy(workbuffer,
351                                                "partition_max_entitled_capacity");
352                                         w_idx = strlen(workbuffer);
353                                 }
354                                 if (0 == strcmp(workbuffer, "MaxPlatProcs")) {
355                                         strcpy(workbuffer,
356                                                "system_potential_processors");
357                                         w_idx = strlen(workbuffer);
358                                 }
359                         }
360                 }
361                 kfree(workbuffer);
362                 local_buffer -= 2;      /* back up over strlen value */
363         }
364         kfree(local_buffer);
365 }
366 
367 /* Return the number of processors in the system.
368  * This function reads through the device tree and counts
369  * the virtual processors, this does not include threads.
370  */
371 static int lparcfg_count_active_processors(void)
372 {
373         struct device_node *cpus_dn;
374         int count = 0;
375 
376         for_each_node_by_type(cpus_dn, "cpu") {
377 #ifdef LPARCFG_DEBUG
378                 printk(KERN_ERR "cpus_dn %p\n", cpus_dn);
379 #endif
380                 count++;
381         }
382         return count;
383 }
384 
385 static void pseries_cmo_data(struct seq_file *m)
386 {
387         int cpu;
388         unsigned long cmo_faults = 0;
389         unsigned long cmo_fault_time = 0;
390 
391         seq_printf(m, "cmo_enabled=%d\n", firmware_has_feature(FW_FEATURE_CMO));
392 
393         if (!firmware_has_feature(FW_FEATURE_CMO))
394                 return;
395 
396         for_each_possible_cpu(cpu) {
397                 cmo_faults += be64_to_cpu(lppaca_of(cpu).cmo_faults);
398                 cmo_fault_time += be64_to_cpu(lppaca_of(cpu).cmo_fault_time);
399         }
400 
401         seq_printf(m, "cmo_faults=%lu\n", cmo_faults);
402         seq_printf(m, "cmo_fault_time_usec=%lu\n",
403                    cmo_fault_time / tb_ticks_per_usec);
404         seq_printf(m, "cmo_primary_psp=%d\n", cmo_get_primary_psp());
405         seq_printf(m, "cmo_secondary_psp=%d\n", cmo_get_secondary_psp());
406         seq_printf(m, "cmo_page_size=%lu\n", cmo_get_page_size());
407 }
408 
409 static void splpar_dispatch_data(struct seq_file *m)
410 {
411         int cpu;
412         unsigned long dispatches = 0;
413         unsigned long dispatch_dispersions = 0;
414 
415         for_each_possible_cpu(cpu) {
416                 dispatches += be32_to_cpu(lppaca_of(cpu).yield_count);
417                 dispatch_dispersions +=
418                         be32_to_cpu(lppaca_of(cpu).dispersion_count);
419         }
420 
421         seq_printf(m, "dispatches=%lu\n", dispatches);
422         seq_printf(m, "dispatch_dispersions=%lu\n", dispatch_dispersions);
423 }
424 
425 static void parse_em_data(struct seq_file *m)
426 {
427         unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
428 
429         if (firmware_has_feature(FW_FEATURE_LPAR) &&
430             plpar_hcall(H_GET_EM_PARMS, retbuf) == H_SUCCESS)
431                 seq_printf(m, "power_mode_data=%016lx\n", retbuf[0]);
432 }
433 
434 static int pseries_lparcfg_data(struct seq_file *m, void *v)
435 {
436         int partition_potential_processors;
437         int partition_active_processors;
438         struct device_node *rtas_node;
439         const __be32 *lrdrp = NULL;
440 
441         rtas_node = of_find_node_by_path("/rtas");
442         if (rtas_node)
443                 lrdrp = of_get_property(rtas_node, "ibm,lrdr-capacity", NULL);
444 
445         if (lrdrp == NULL) {
446                 partition_potential_processors = vdso_data->processorCount;
447         } else {
448                 partition_potential_processors = be32_to_cpup(lrdrp + 4);
449         }
450         of_node_put(rtas_node);
451 
452         partition_active_processors = lparcfg_count_active_processors();
453 
454         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
455                 /* this call handles the ibm,get-system-parameter contents */
456                 parse_system_parameter_string(m);
457                 parse_ppp_data(m);
458                 parse_mpp_data(m);
459                 parse_mpp_x_data(m);
460                 pseries_cmo_data(m);
461                 splpar_dispatch_data(m);
462 
463                 seq_printf(m, "purr=%ld\n", get_purr());
464         } else {                /* non SPLPAR case */
465 
466                 seq_printf(m, "system_active_processors=%d\n",
467                            partition_potential_processors);
468 
469                 seq_printf(m, "system_potential_processors=%d\n",
470                            partition_potential_processors);
471 
472                 seq_printf(m, "partition_max_entitled_capacity=%d\n",
473                            partition_potential_processors * 100);
474 
475                 seq_printf(m, "partition_entitled_capacity=%d\n",
476                            partition_active_processors * 100);
477         }
478 
479         seq_printf(m, "partition_active_processors=%d\n",
480                    partition_active_processors);
481 
482         seq_printf(m, "partition_potential_processors=%d\n",
483                    partition_potential_processors);
484 
485         seq_printf(m, "shared_processor_mode=%d\n",
486                    lppaca_shared_proc(get_lppaca()));
487 
488 #ifdef CONFIG_PPC_BOOK3S_64
489         seq_printf(m, "slb_size=%d\n", mmu_slb_size);
490 #endif
491         parse_em_data(m);
492 
493         return 0;
494 }
495 
496 static ssize_t update_ppp(u64 *entitlement, u8 *weight)
497 {
498         struct hvcall_ppp_data ppp_data;
499         u8 new_weight;
500         u64 new_entitled;
501         ssize_t retval;
502 
503         /* Get our current parameters */
504         retval = h_get_ppp(&ppp_data);
505         if (retval)
506                 return retval;
507 
508         if (entitlement) {
509                 new_weight = ppp_data.weight;
510                 new_entitled = *entitlement;
511         } else if (weight) {
512                 new_weight = *weight;
513                 new_entitled = ppp_data.entitlement;
514         } else
515                 return -EINVAL;
516 
517         pr_debug("%s: current_entitled = %llu, current_weight = %u\n",
518                  __func__, ppp_data.entitlement, ppp_data.weight);
519 
520         pr_debug("%s: new_entitled = %llu, new_weight = %u\n",
521                  __func__, new_entitled, new_weight);
522 
523         retval = plpar_hcall_norets(H_SET_PPP, new_entitled, new_weight);
524         return retval;
525 }
526 
527 /**
528  * update_mpp
529  *
530  * Update the memory entitlement and weight for the partition.  Caller must
531  * specify either a new entitlement or weight, not both, to be updated
532  * since the h_set_mpp call takes both entitlement and weight as parameters.
533  */
534 static ssize_t update_mpp(u64 *entitlement, u8 *weight)
535 {
536         struct hvcall_mpp_data mpp_data;
537         u64 new_entitled;
538         u8 new_weight;
539         ssize_t rc;
540 
541         if (entitlement) {
542                 /* Check with vio to ensure the new memory entitlement
543                  * can be handled.
544                  */
545                 rc = vio_cmo_entitlement_update(*entitlement);
546                 if (rc)
547                         return rc;
548         }
549 
550         rc = h_get_mpp(&mpp_data);
551         if (rc)
552                 return rc;
553 
554         if (entitlement) {
555                 new_weight = mpp_data.mem_weight;
556                 new_entitled = *entitlement;
557         } else if (weight) {
558                 new_weight = *weight;
559                 new_entitled = mpp_data.entitled_mem;
560         } else
561                 return -EINVAL;
562 
563         pr_debug("%s: current_entitled = %lu, current_weight = %u\n",
564                  __func__, mpp_data.entitled_mem, mpp_data.mem_weight);
565 
566         pr_debug("%s: new_entitled = %llu, new_weight = %u\n",
567                  __func__, new_entitled, new_weight);
568 
569         rc = plpar_hcall_norets(H_SET_MPP, new_entitled, new_weight);
570         return rc;
571 }
572 
573 /*
574  * Interface for changing system parameters (variable capacity weight
575  * and entitled capacity).  Format of input is "param_name=value";
576  * anything after value is ignored.  Valid parameters at this time are
577  * "partition_entitled_capacity" and "capacity_weight".  We use
578  * H_SET_PPP to alter parameters.
579  *
580  * This function should be invoked only on systems with
581  * FW_FEATURE_SPLPAR.
582  */
583 static ssize_t lparcfg_write(struct file *file, const char __user * buf,
584                              size_t count, loff_t * off)
585 {
586         int kbuf_sz = 64;
587         char kbuf[kbuf_sz];
588         char *tmp;
589         u64 new_entitled, *new_entitled_ptr = &new_entitled;
590         u8 new_weight, *new_weight_ptr = &new_weight;
591         ssize_t retval;
592 
593         if (!firmware_has_feature(FW_FEATURE_SPLPAR))
594                 return -EINVAL;
595 
596         if (count > kbuf_sz)
597                 return -EINVAL;
598 
599         if (copy_from_user(kbuf, buf, count))
600                 return -EFAULT;
601 
602         kbuf[count - 1] = '\0';
603         tmp = strchr(kbuf, '=');
604         if (!tmp)
605                 return -EINVAL;
606 
607         *tmp++ = '\0';
608 
609         if (!strcmp(kbuf, "partition_entitled_capacity")) {
610                 char *endp;
611                 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
612                 if (endp == tmp)
613                         return -EINVAL;
614 
615                 retval = update_ppp(new_entitled_ptr, NULL);
616         } else if (!strcmp(kbuf, "capacity_weight")) {
617                 char *endp;
618                 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
619                 if (endp == tmp)
620                         return -EINVAL;
621 
622                 retval = update_ppp(NULL, new_weight_ptr);
623         } else if (!strcmp(kbuf, "entitled_memory")) {
624                 char *endp;
625                 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
626                 if (endp == tmp)
627                         return -EINVAL;
628 
629                 retval = update_mpp(new_entitled_ptr, NULL);
630         } else if (!strcmp(kbuf, "entitled_memory_weight")) {
631                 char *endp;
632                 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
633                 if (endp == tmp)
634                         return -EINVAL;
635 
636                 retval = update_mpp(NULL, new_weight_ptr);
637         } else
638                 return -EINVAL;
639 
640         if (retval == H_SUCCESS || retval == H_CONSTRAINED) {
641                 retval = count;
642         } else if (retval == H_BUSY) {
643                 retval = -EBUSY;
644         } else if (retval == H_HARDWARE) {
645                 retval = -EIO;
646         } else if (retval == H_PARAMETER) {
647                 retval = -EINVAL;
648         }
649 
650         return retval;
651 }
652 
653 static int lparcfg_data(struct seq_file *m, void *v)
654 {
655         struct device_node *rootdn;
656         const char *model = "";
657         const char *system_id = "";
658         const char *tmp;
659         const __be32 *lp_index_ptr;
660         unsigned int lp_index = 0;
661 
662         seq_printf(m, "%s %s\n", MODULE_NAME, MODULE_VERS);
663 
664         rootdn = of_find_node_by_path("/");
665         if (rootdn) {
666                 tmp = of_get_property(rootdn, "model", NULL);
667                 if (tmp)
668                         model = tmp;
669                 tmp = of_get_property(rootdn, "system-id", NULL);
670                 if (tmp)
671                         system_id = tmp;
672                 lp_index_ptr = of_get_property(rootdn, "ibm,partition-no",
673                                         NULL);
674                 if (lp_index_ptr)
675                         lp_index = be32_to_cpup(lp_index_ptr);
676                 of_node_put(rootdn);
677         }
678         seq_printf(m, "serial_number=%s\n", system_id);
679         seq_printf(m, "system_type=%s\n", model);
680         seq_printf(m, "partition_id=%d\n", (int)lp_index);
681 
682         return pseries_lparcfg_data(m, v);
683 }
684 
685 static int lparcfg_open(struct inode *inode, struct file *file)
686 {
687         return single_open(file, lparcfg_data, NULL);
688 }
689 
690 static const struct file_operations lparcfg_fops = {
691         .read           = seq_read,
692         .write          = lparcfg_write,
693         .open           = lparcfg_open,
694         .release        = single_release,
695         .llseek         = seq_lseek,
696 };
697 
698 static int __init lparcfg_init(void)
699 {
700         umode_t mode = 0444;
701 
702         /* Allow writing if we have FW_FEATURE_SPLPAR */
703         if (firmware_has_feature(FW_FEATURE_SPLPAR))
704                 mode |= 0200;
705 
706         if (!proc_create("powerpc/lparcfg", mode, NULL, &lparcfg_fops)) {
707                 printk(KERN_ERR "Failed to create powerpc/lparcfg\n");
708                 return -EIO;
709         }
710         return 0;
711 }
712 machine_device_initcall(pseries, lparcfg_init);
713 

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