lparcfg.c 19 KB

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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. #include <linux/module.h>
  21. #include <linux/types.h>
  22. #include <linux/errno.h>
  23. #include <linux/proc_fs.h>
  24. #include <linux/init.h>
  25. #include <linux/seq_file.h>
  26. #include <linux/slab.h>
  27. #include <asm/uaccess.h>
  28. #include <asm/lppaca.h>
  29. #include <asm/hvcall.h>
  30. #include <asm/firmware.h>
  31. #include <asm/rtas.h>
  32. #include <asm/time.h>
  33. #include <asm/prom.h>
  34. #include <asm/vdso_datapage.h>
  35. #include <asm/vio.h>
  36. #include <asm/mmu.h>
  37. #include <asm/machdep.h>
  38. /*
  39. * This isn't a module but we expose that to userspace
  40. * via /proc so leave the definitions here
  41. */
  42. #define MODULE_VERS "1.9"
  43. #define MODULE_NAME "lparcfg"
  44. /* #define LPARCFG_DEBUG */
  45. static struct proc_dir_entry *proc_ppc64_lparcfg;
  46. /*
  47. * Track sum of all purrs across all processors. This is used to further
  48. * calculate usage values by different applications
  49. */
  50. static unsigned long get_purr(void)
  51. {
  52. unsigned long sum_purr = 0;
  53. int cpu;
  54. for_each_possible_cpu(cpu) {
  55. struct cpu_usage *cu;
  56. cu = &per_cpu(cpu_usage_array, cpu);
  57. sum_purr += cu->current_tb;
  58. }
  59. return sum_purr;
  60. }
  61. /*
  62. * Methods used to fetch LPAR data when running on a pSeries platform.
  63. */
  64. struct hvcall_ppp_data {
  65. u64 entitlement;
  66. u64 unallocated_entitlement;
  67. u16 group_num;
  68. u16 pool_num;
  69. u8 capped;
  70. u8 weight;
  71. u8 unallocated_weight;
  72. u16 active_procs_in_pool;
  73. u16 active_system_procs;
  74. u16 phys_platform_procs;
  75. u32 max_proc_cap_avail;
  76. u32 entitled_proc_cap_avail;
  77. };
  78. /*
  79. * H_GET_PPP hcall returns info in 4 parms.
  80. * entitled_capacity,unallocated_capacity,
  81. * aggregation, resource_capability).
  82. *
  83. * R4 = Entitled Processor Capacity Percentage.
  84. * R5 = Unallocated Processor Capacity Percentage.
  85. * R6 (AABBCCDDEEFFGGHH).
  86. * XXXX - reserved (0)
  87. * XXXX - reserved (0)
  88. * XXXX - Group Number
  89. * XXXX - Pool Number.
  90. * R7 (IIJJKKLLMMNNOOPP).
  91. * XX - reserved. (0)
  92. * XX - bit 0-6 reserved (0). bit 7 is Capped indicator.
  93. * XX - variable processor Capacity Weight
  94. * XX - Unallocated Variable Processor Capacity Weight.
  95. * XXXX - Active processors in Physical Processor Pool.
  96. * XXXX - Processors active on platform.
  97. * R8 (QQQQRRRRRRSSSSSS). if ibm,partition-performance-parameters-level >= 1
  98. * XXXX - Physical platform procs allocated to virtualization.
  99. * XXXXXX - Max procs capacity % available to the partitions pool.
  100. * XXXXXX - Entitled procs capacity % available to the
  101. * partitions pool.
  102. */
  103. static unsigned int h_get_ppp(struct hvcall_ppp_data *ppp_data)
  104. {
  105. unsigned long rc;
  106. unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];
  107. rc = plpar_hcall9(H_GET_PPP, retbuf);
  108. ppp_data->entitlement = retbuf[0];
  109. ppp_data->unallocated_entitlement = retbuf[1];
  110. ppp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff;
  111. ppp_data->pool_num = retbuf[2] & 0xffff;
  112. ppp_data->capped = (retbuf[3] >> 6 * 8) & 0x01;
  113. ppp_data->weight = (retbuf[3] >> 5 * 8) & 0xff;
  114. ppp_data->unallocated_weight = (retbuf[3] >> 4 * 8) & 0xff;
  115. ppp_data->active_procs_in_pool = (retbuf[3] >> 2 * 8) & 0xffff;
  116. ppp_data->active_system_procs = retbuf[3] & 0xffff;
  117. ppp_data->phys_platform_procs = retbuf[4] >> 6 * 8;
  118. ppp_data->max_proc_cap_avail = (retbuf[4] >> 3 * 8) & 0xffffff;
  119. ppp_data->entitled_proc_cap_avail = retbuf[4] & 0xffffff;
  120. return rc;
  121. }
  122. static unsigned h_pic(unsigned long *pool_idle_time,
  123. unsigned long *num_procs)
  124. {
  125. unsigned long rc;
  126. unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
  127. rc = plpar_hcall(H_PIC, retbuf);
  128. *pool_idle_time = retbuf[0];
  129. *num_procs = retbuf[1];
  130. return rc;
  131. }
  132. /*
  133. * parse_ppp_data
  134. * Parse out the data returned from h_get_ppp and h_pic
  135. */
  136. static void parse_ppp_data(struct seq_file *m)
  137. {
  138. struct hvcall_ppp_data ppp_data;
  139. struct device_node *root;
  140. const int *perf_level;
  141. int rc;
  142. rc = h_get_ppp(&ppp_data);
  143. if (rc)
  144. return;
  145. seq_printf(m, "partition_entitled_capacity=%lld\n",
  146. ppp_data.entitlement);
  147. seq_printf(m, "group=%d\n", ppp_data.group_num);
  148. seq_printf(m, "system_active_processors=%d\n",
  149. ppp_data.active_system_procs);
  150. /* pool related entries are appropriate for shared configs */
  151. if (lppaca_of(0).shared_proc) {
  152. unsigned long pool_idle_time, pool_procs;
  153. seq_printf(m, "pool=%d\n", ppp_data.pool_num);
  154. /* report pool_capacity in percentage */
  155. seq_printf(m, "pool_capacity=%d\n",
  156. ppp_data.active_procs_in_pool * 100);
  157. h_pic(&pool_idle_time, &pool_procs);
  158. seq_printf(m, "pool_idle_time=%ld\n", pool_idle_time);
  159. seq_printf(m, "pool_num_procs=%ld\n", pool_procs);
  160. }
  161. seq_printf(m, "unallocated_capacity_weight=%d\n",
  162. ppp_data.unallocated_weight);
  163. seq_printf(m, "capacity_weight=%d\n", ppp_data.weight);
  164. seq_printf(m, "capped=%d\n", ppp_data.capped);
  165. seq_printf(m, "unallocated_capacity=%lld\n",
  166. ppp_data.unallocated_entitlement);
  167. /* The last bits of information returned from h_get_ppp are only
  168. * valid if the ibm,partition-performance-parameters-level
  169. * property is >= 1.
  170. */
  171. root = of_find_node_by_path("/");
  172. if (root) {
  173. perf_level = of_get_property(root,
  174. "ibm,partition-performance-parameters-level",
  175. NULL);
  176. if (perf_level && (*perf_level >= 1)) {
  177. seq_printf(m,
  178. "physical_procs_allocated_to_virtualization=%d\n",
  179. ppp_data.phys_platform_procs);
  180. seq_printf(m, "max_proc_capacity_available=%d\n",
  181. ppp_data.max_proc_cap_avail);
  182. seq_printf(m, "entitled_proc_capacity_available=%d\n",
  183. ppp_data.entitled_proc_cap_avail);
  184. }
  185. of_node_put(root);
  186. }
  187. }
  188. /**
  189. * parse_mpp_data
  190. * Parse out data returned from h_get_mpp
  191. */
  192. static void parse_mpp_data(struct seq_file *m)
  193. {
  194. struct hvcall_mpp_data mpp_data;
  195. int rc;
  196. rc = h_get_mpp(&mpp_data);
  197. if (rc)
  198. return;
  199. seq_printf(m, "entitled_memory=%ld\n", mpp_data.entitled_mem);
  200. if (mpp_data.mapped_mem != -1)
  201. seq_printf(m, "mapped_entitled_memory=%ld\n",
  202. mpp_data.mapped_mem);
  203. seq_printf(m, "entitled_memory_group_number=%d\n", mpp_data.group_num);
  204. seq_printf(m, "entitled_memory_pool_number=%d\n", mpp_data.pool_num);
  205. seq_printf(m, "entitled_memory_weight=%d\n", mpp_data.mem_weight);
  206. seq_printf(m, "unallocated_entitled_memory_weight=%d\n",
  207. mpp_data.unallocated_mem_weight);
  208. seq_printf(m, "unallocated_io_mapping_entitlement=%ld\n",
  209. mpp_data.unallocated_entitlement);
  210. if (mpp_data.pool_size != -1)
  211. seq_printf(m, "entitled_memory_pool_size=%ld bytes\n",
  212. mpp_data.pool_size);
  213. seq_printf(m, "entitled_memory_loan_request=%ld\n",
  214. mpp_data.loan_request);
  215. seq_printf(m, "backing_memory=%ld bytes\n", mpp_data.backing_mem);
  216. }
  217. /**
  218. * parse_mpp_x_data
  219. * Parse out data returned from h_get_mpp_x
  220. */
  221. static void parse_mpp_x_data(struct seq_file *m)
  222. {
  223. struct hvcall_mpp_x_data mpp_x_data;
  224. if (!firmware_has_feature(FW_FEATURE_XCMO))
  225. return;
  226. if (h_get_mpp_x(&mpp_x_data))
  227. return;
  228. seq_printf(m, "coalesced_bytes=%ld\n", mpp_x_data.coalesced_bytes);
  229. if (mpp_x_data.pool_coalesced_bytes)
  230. seq_printf(m, "pool_coalesced_bytes=%ld\n",
  231. mpp_x_data.pool_coalesced_bytes);
  232. if (mpp_x_data.pool_purr_cycles)
  233. seq_printf(m, "coalesce_pool_purr=%ld\n", mpp_x_data.pool_purr_cycles);
  234. if (mpp_x_data.pool_spurr_cycles)
  235. seq_printf(m, "coalesce_pool_spurr=%ld\n", mpp_x_data.pool_spurr_cycles);
  236. }
  237. #define SPLPAR_CHARACTERISTICS_TOKEN 20
  238. #define SPLPAR_MAXLENGTH 1026*(sizeof(char))
  239. /*
  240. * parse_system_parameter_string()
  241. * Retrieve the potential_processors, max_entitled_capacity and friends
  242. * through the get-system-parameter rtas call. Replace keyword strings as
  243. * necessary.
  244. */
  245. static void parse_system_parameter_string(struct seq_file *m)
  246. {
  247. int call_status;
  248. unsigned char *local_buffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
  249. if (!local_buffer) {
  250. printk(KERN_ERR "%s %s kmalloc failure at line %d\n",
  251. __FILE__, __func__, __LINE__);
  252. return;
  253. }
  254. spin_lock(&rtas_data_buf_lock);
  255. memset(rtas_data_buf, 0, SPLPAR_MAXLENGTH);
  256. call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
  257. NULL,
  258. SPLPAR_CHARACTERISTICS_TOKEN,
  259. __pa(rtas_data_buf),
  260. RTAS_DATA_BUF_SIZE);
  261. memcpy(local_buffer, rtas_data_buf, SPLPAR_MAXLENGTH);
  262. local_buffer[SPLPAR_MAXLENGTH - 1] = '\0';
  263. spin_unlock(&rtas_data_buf_lock);
  264. if (call_status != 0) {
  265. printk(KERN_INFO
  266. "%s %s Error calling get-system-parameter (0x%x)\n",
  267. __FILE__, __func__, call_status);
  268. } else {
  269. int splpar_strlen;
  270. int idx, w_idx;
  271. char *workbuffer = kzalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
  272. if (!workbuffer) {
  273. printk(KERN_ERR "%s %s kmalloc failure at line %d\n",
  274. __FILE__, __func__, __LINE__);
  275. kfree(local_buffer);
  276. return;
  277. }
  278. #ifdef LPARCFG_DEBUG
  279. printk(KERN_INFO "success calling get-system-parameter\n");
  280. #endif
  281. splpar_strlen = local_buffer[0] * 256 + local_buffer[1];
  282. local_buffer += 2; /* step over strlen value */
  283. w_idx = 0;
  284. idx = 0;
  285. while ((*local_buffer) && (idx < splpar_strlen)) {
  286. workbuffer[w_idx++] = local_buffer[idx++];
  287. if ((local_buffer[idx] == ',')
  288. || (local_buffer[idx] == '\0')) {
  289. workbuffer[w_idx] = '\0';
  290. if (w_idx) {
  291. /* avoid the empty string */
  292. seq_printf(m, "%s\n", workbuffer);
  293. }
  294. memset(workbuffer, 0, SPLPAR_MAXLENGTH);
  295. idx++; /* skip the comma */
  296. w_idx = 0;
  297. } else if (local_buffer[idx] == '=') {
  298. /* code here to replace workbuffer contents
  299. with different keyword strings */
  300. if (0 == strcmp(workbuffer, "MaxEntCap")) {
  301. strcpy(workbuffer,
  302. "partition_max_entitled_capacity");
  303. w_idx = strlen(workbuffer);
  304. }
  305. if (0 == strcmp(workbuffer, "MaxPlatProcs")) {
  306. strcpy(workbuffer,
  307. "system_potential_processors");
  308. w_idx = strlen(workbuffer);
  309. }
  310. }
  311. }
  312. kfree(workbuffer);
  313. local_buffer -= 2; /* back up over strlen value */
  314. }
  315. kfree(local_buffer);
  316. }
  317. /* Return the number of processors in the system.
  318. * This function reads through the device tree and counts
  319. * the virtual processors, this does not include threads.
  320. */
  321. static int lparcfg_count_active_processors(void)
  322. {
  323. struct device_node *cpus_dn = NULL;
  324. int count = 0;
  325. while ((cpus_dn = of_find_node_by_type(cpus_dn, "cpu"))) {
  326. #ifdef LPARCFG_DEBUG
  327. printk(KERN_ERR "cpus_dn %p\n", cpus_dn);
  328. #endif
  329. count++;
  330. }
  331. return count;
  332. }
  333. static void pseries_cmo_data(struct seq_file *m)
  334. {
  335. int cpu;
  336. unsigned long cmo_faults = 0;
  337. unsigned long cmo_fault_time = 0;
  338. seq_printf(m, "cmo_enabled=%d\n", firmware_has_feature(FW_FEATURE_CMO));
  339. if (!firmware_has_feature(FW_FEATURE_CMO))
  340. return;
  341. for_each_possible_cpu(cpu) {
  342. cmo_faults += lppaca_of(cpu).cmo_faults;
  343. cmo_fault_time += lppaca_of(cpu).cmo_fault_time;
  344. }
  345. seq_printf(m, "cmo_faults=%lu\n", cmo_faults);
  346. seq_printf(m, "cmo_fault_time_usec=%lu\n",
  347. cmo_fault_time / tb_ticks_per_usec);
  348. seq_printf(m, "cmo_primary_psp=%d\n", cmo_get_primary_psp());
  349. seq_printf(m, "cmo_secondary_psp=%d\n", cmo_get_secondary_psp());
  350. seq_printf(m, "cmo_page_size=%lu\n", cmo_get_page_size());
  351. }
  352. static void splpar_dispatch_data(struct seq_file *m)
  353. {
  354. int cpu;
  355. unsigned long dispatches = 0;
  356. unsigned long dispatch_dispersions = 0;
  357. for_each_possible_cpu(cpu) {
  358. dispatches += lppaca_of(cpu).yield_count;
  359. dispatch_dispersions += lppaca_of(cpu).dispersion_count;
  360. }
  361. seq_printf(m, "dispatches=%lu\n", dispatches);
  362. seq_printf(m, "dispatch_dispersions=%lu\n", dispatch_dispersions);
  363. }
  364. static void parse_em_data(struct seq_file *m)
  365. {
  366. unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
  367. if (firmware_has_feature(FW_FEATURE_LPAR) &&
  368. plpar_hcall(H_GET_EM_PARMS, retbuf) == H_SUCCESS)
  369. seq_printf(m, "power_mode_data=%016lx\n", retbuf[0]);
  370. }
  371. static int pseries_lparcfg_data(struct seq_file *m, void *v)
  372. {
  373. int partition_potential_processors;
  374. int partition_active_processors;
  375. struct device_node *rtas_node;
  376. const int *lrdrp = NULL;
  377. rtas_node = of_find_node_by_path("/rtas");
  378. if (rtas_node)
  379. lrdrp = of_get_property(rtas_node, "ibm,lrdr-capacity", NULL);
  380. if (lrdrp == NULL) {
  381. partition_potential_processors = vdso_data->processorCount;
  382. } else {
  383. partition_potential_processors = *(lrdrp + 4);
  384. }
  385. of_node_put(rtas_node);
  386. partition_active_processors = lparcfg_count_active_processors();
  387. if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
  388. /* this call handles the ibm,get-system-parameter contents */
  389. parse_system_parameter_string(m);
  390. parse_ppp_data(m);
  391. parse_mpp_data(m);
  392. parse_mpp_x_data(m);
  393. pseries_cmo_data(m);
  394. splpar_dispatch_data(m);
  395. seq_printf(m, "purr=%ld\n", get_purr());
  396. } else { /* non SPLPAR case */
  397. seq_printf(m, "system_active_processors=%d\n",
  398. partition_potential_processors);
  399. seq_printf(m, "system_potential_processors=%d\n",
  400. partition_potential_processors);
  401. seq_printf(m, "partition_max_entitled_capacity=%d\n",
  402. partition_potential_processors * 100);
  403. seq_printf(m, "partition_entitled_capacity=%d\n",
  404. partition_active_processors * 100);
  405. }
  406. seq_printf(m, "partition_active_processors=%d\n",
  407. partition_active_processors);
  408. seq_printf(m, "partition_potential_processors=%d\n",
  409. partition_potential_processors);
  410. seq_printf(m, "shared_processor_mode=%d\n", lppaca_of(0).shared_proc);
  411. seq_printf(m, "slb_size=%d\n", mmu_slb_size);
  412. parse_em_data(m);
  413. return 0;
  414. }
  415. static ssize_t update_ppp(u64 *entitlement, u8 *weight)
  416. {
  417. struct hvcall_ppp_data ppp_data;
  418. u8 new_weight;
  419. u64 new_entitled;
  420. ssize_t retval;
  421. /* Get our current parameters */
  422. retval = h_get_ppp(&ppp_data);
  423. if (retval)
  424. return retval;
  425. if (entitlement) {
  426. new_weight = ppp_data.weight;
  427. new_entitled = *entitlement;
  428. } else if (weight) {
  429. new_weight = *weight;
  430. new_entitled = ppp_data.entitlement;
  431. } else
  432. return -EINVAL;
  433. pr_debug("%s: current_entitled = %llu, current_weight = %u\n",
  434. __func__, ppp_data.entitlement, ppp_data.weight);
  435. pr_debug("%s: new_entitled = %llu, new_weight = %u\n",
  436. __func__, new_entitled, new_weight);
  437. retval = plpar_hcall_norets(H_SET_PPP, new_entitled, new_weight);
  438. return retval;
  439. }
  440. /**
  441. * update_mpp
  442. *
  443. * Update the memory entitlement and weight for the partition. Caller must
  444. * specify either a new entitlement or weight, not both, to be updated
  445. * since the h_set_mpp call takes both entitlement and weight as parameters.
  446. */
  447. static ssize_t update_mpp(u64 *entitlement, u8 *weight)
  448. {
  449. struct hvcall_mpp_data mpp_data;
  450. u64 new_entitled;
  451. u8 new_weight;
  452. ssize_t rc;
  453. if (entitlement) {
  454. /* Check with vio to ensure the new memory entitlement
  455. * can be handled.
  456. */
  457. rc = vio_cmo_entitlement_update(*entitlement);
  458. if (rc)
  459. return rc;
  460. }
  461. rc = h_get_mpp(&mpp_data);
  462. if (rc)
  463. return rc;
  464. if (entitlement) {
  465. new_weight = mpp_data.mem_weight;
  466. new_entitled = *entitlement;
  467. } else if (weight) {
  468. new_weight = *weight;
  469. new_entitled = mpp_data.entitled_mem;
  470. } else
  471. return -EINVAL;
  472. pr_debug("%s: current_entitled = %lu, current_weight = %u\n",
  473. __func__, mpp_data.entitled_mem, mpp_data.mem_weight);
  474. pr_debug("%s: new_entitled = %llu, new_weight = %u\n",
  475. __func__, new_entitled, new_weight);
  476. rc = plpar_hcall_norets(H_SET_MPP, new_entitled, new_weight);
  477. return rc;
  478. }
  479. /*
  480. * Interface for changing system parameters (variable capacity weight
  481. * and entitled capacity). Format of input is "param_name=value";
  482. * anything after value is ignored. Valid parameters at this time are
  483. * "partition_entitled_capacity" and "capacity_weight". We use
  484. * H_SET_PPP to alter parameters.
  485. *
  486. * This function should be invoked only on systems with
  487. * FW_FEATURE_SPLPAR.
  488. */
  489. static ssize_t lparcfg_write(struct file *file, const char __user * buf,
  490. size_t count, loff_t * off)
  491. {
  492. int kbuf_sz = 64;
  493. char kbuf[kbuf_sz];
  494. char *tmp;
  495. u64 new_entitled, *new_entitled_ptr = &new_entitled;
  496. u8 new_weight, *new_weight_ptr = &new_weight;
  497. ssize_t retval;
  498. if (!firmware_has_feature(FW_FEATURE_SPLPAR))
  499. return -EINVAL;
  500. if (count > kbuf_sz)
  501. return -EINVAL;
  502. if (copy_from_user(kbuf, buf, count))
  503. return -EFAULT;
  504. kbuf[count - 1] = '\0';
  505. tmp = strchr(kbuf, '=');
  506. if (!tmp)
  507. return -EINVAL;
  508. *tmp++ = '\0';
  509. if (!strcmp(kbuf, "partition_entitled_capacity")) {
  510. char *endp;
  511. *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
  512. if (endp == tmp)
  513. return -EINVAL;
  514. retval = update_ppp(new_entitled_ptr, NULL);
  515. } else if (!strcmp(kbuf, "capacity_weight")) {
  516. char *endp;
  517. *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
  518. if (endp == tmp)
  519. return -EINVAL;
  520. retval = update_ppp(NULL, new_weight_ptr);
  521. } else if (!strcmp(kbuf, "entitled_memory")) {
  522. char *endp;
  523. *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
  524. if (endp == tmp)
  525. return -EINVAL;
  526. retval = update_mpp(new_entitled_ptr, NULL);
  527. } else if (!strcmp(kbuf, "entitled_memory_weight")) {
  528. char *endp;
  529. *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
  530. if (endp == tmp)
  531. return -EINVAL;
  532. retval = update_mpp(NULL, new_weight_ptr);
  533. } else
  534. return -EINVAL;
  535. if (retval == H_SUCCESS || retval == H_CONSTRAINED) {
  536. retval = count;
  537. } else if (retval == H_BUSY) {
  538. retval = -EBUSY;
  539. } else if (retval == H_HARDWARE) {
  540. retval = -EIO;
  541. } else if (retval == H_PARAMETER) {
  542. retval = -EINVAL;
  543. }
  544. return retval;
  545. }
  546. static int lparcfg_data(struct seq_file *m, void *v)
  547. {
  548. struct device_node *rootdn;
  549. const char *model = "";
  550. const char *system_id = "";
  551. const char *tmp;
  552. const unsigned int *lp_index_ptr;
  553. unsigned int lp_index = 0;
  554. seq_printf(m, "%s %s\n", MODULE_NAME, MODULE_VERS);
  555. rootdn = of_find_node_by_path("/");
  556. if (rootdn) {
  557. tmp = of_get_property(rootdn, "model", NULL);
  558. if (tmp)
  559. model = tmp;
  560. tmp = of_get_property(rootdn, "system-id", NULL);
  561. if (tmp)
  562. system_id = tmp;
  563. lp_index_ptr = of_get_property(rootdn, "ibm,partition-no",
  564. NULL);
  565. if (lp_index_ptr)
  566. lp_index = *lp_index_ptr;
  567. of_node_put(rootdn);
  568. }
  569. seq_printf(m, "serial_number=%s\n", system_id);
  570. seq_printf(m, "system_type=%s\n", model);
  571. seq_printf(m, "partition_id=%d\n", (int)lp_index);
  572. return pseries_lparcfg_data(m, v);
  573. }
  574. static int lparcfg_open(struct inode *inode, struct file *file)
  575. {
  576. return single_open(file, lparcfg_data, NULL);
  577. }
  578. static const struct file_operations lparcfg_fops = {
  579. .read = seq_read,
  580. .write = lparcfg_write,
  581. .open = lparcfg_open,
  582. .release = single_release,
  583. .llseek = seq_lseek,
  584. };
  585. static int __init lparcfg_init(void)
  586. {
  587. struct proc_dir_entry *ent;
  588. umode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
  589. /* Allow writing if we have FW_FEATURE_SPLPAR */
  590. if (firmware_has_feature(FW_FEATURE_SPLPAR))
  591. mode |= S_IWUSR;
  592. ent = proc_create("powerpc/lparcfg", mode, NULL, &lparcfg_fops);
  593. if (!ent) {
  594. printk(KERN_ERR "Failed to create powerpc/lparcfg\n");
  595. return -EIO;
  596. }
  597. proc_ppc64_lparcfg = ent;
  598. return 0;
  599. }
  600. machine_device_initcall(pseries, lparcfg_init);