2 * PowerPC64 LPAR Configuration Information Driver
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.
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.
17 * This driver creates a proc file at /proc/ppc64/lparcfg which contains
18 * keyword - value pairs that specify the configuration of the partition.
21 #include <linux/config.h>
22 #include <linux/module.h>
23 #include <linux/types.h>
24 #include <linux/errno.h>
25 #include <linux/proc_fs.h>
26 #include <linux/init.h>
27 #include <linux/seq_file.h>
28 #include <asm/uaccess.h>
29 #include <asm/iSeries/HvLpConfig.h>
30 #include <asm/lppaca.h>
31 #include <asm/iSeries/LparData.h>
32 #include <asm/hvcall.h>
33 #include <asm/cputable.h>
35 #include <asm/system.h>
37 #define MODULE_VERS "1.5"
38 #define MODULE_NAME "lparcfg"
40 /* #define LPARCFG_DEBUG */
42 /* find a better place for this function... */
43 void log_plpar_hcall_return(unsigned long rc, char *tag)
45 if (rc == 0) /* success, return */
47 /* check for null tag ? */
50 "plpar-hcall (%s) failed with hardware fault\n", tag);
51 else if (rc == H_Function)
53 "plpar-hcall (%s) failed; function not allowed\n", tag);
54 else if (rc == H_Authority)
56 "plpar-hcall (%s) failed; not authorized to this function\n",
58 else if (rc == H_Parameter)
59 printk(KERN_INFO "plpar-hcall (%s) failed; Bad parameter(s)\n",
63 "plpar-hcall (%s) failed with unexpected rc(0x%lx)\n",
68 static struct proc_dir_entry *proc_ppc64_lparcfg;
69 #define LPARCFG_BUFF_SIZE 4096
71 #ifdef CONFIG_PPC_ISERIES
74 * For iSeries legacy systems, the PPA purr function is available from the
75 * emulated_time_base field in the paca.
77 static unsigned long get_purr(void)
79 unsigned long sum_purr = 0;
81 struct paca_struct *lpaca;
85 sum_purr += lpaca->lppaca.emulated_time_base;
88 printk(KERN_INFO "get_purr for cpu (%d) has value (%ld) \n",
89 cpu, lpaca->lppaca.emulated_time_base);
95 #define lparcfg_write NULL
98 * Methods used to fetch LPAR data when running on an iSeries platform.
100 static int lparcfg_data(struct seq_file *m, void *v)
102 unsigned long pool_id, lp_index;
103 int shared, entitled_capacity, max_entitled_capacity;
104 int processors, max_processors;
105 struct paca_struct *lpaca = get_paca();
106 unsigned long purr = get_purr();
108 seq_printf(m, "%s %s \n", MODULE_NAME, MODULE_VERS);
110 shared = (int)(lpaca->lppaca_ptr->shared_proc);
111 seq_printf(m, "serial_number=%c%c%c%c%c%c%c\n",
112 e2a(xItExtVpdPanel.mfgID[2]),
113 e2a(xItExtVpdPanel.mfgID[3]),
114 e2a(xItExtVpdPanel.systemSerial[1]),
115 e2a(xItExtVpdPanel.systemSerial[2]),
116 e2a(xItExtVpdPanel.systemSerial[3]),
117 e2a(xItExtVpdPanel.systemSerial[4]),
118 e2a(xItExtVpdPanel.systemSerial[5]));
120 seq_printf(m, "system_type=%c%c%c%c\n",
121 e2a(xItExtVpdPanel.machineType[0]),
122 e2a(xItExtVpdPanel.machineType[1]),
123 e2a(xItExtVpdPanel.machineType[2]),
124 e2a(xItExtVpdPanel.machineType[3]));
126 lp_index = HvLpConfig_getLpIndex();
127 seq_printf(m, "partition_id=%d\n", (int)lp_index);
129 seq_printf(m, "system_active_processors=%d\n",
130 (int)HvLpConfig_getSystemPhysicalProcessors());
132 seq_printf(m, "system_potential_processors=%d\n",
133 (int)HvLpConfig_getSystemPhysicalProcessors());
135 processors = (int)HvLpConfig_getPhysicalProcessors();
136 seq_printf(m, "partition_active_processors=%d\n", processors);
138 max_processors = (int)HvLpConfig_getMaxPhysicalProcessors();
139 seq_printf(m, "partition_potential_processors=%d\n", max_processors);
142 entitled_capacity = HvLpConfig_getSharedProcUnits();
143 max_entitled_capacity = HvLpConfig_getMaxSharedProcUnits();
145 entitled_capacity = processors * 100;
146 max_entitled_capacity = max_processors * 100;
148 seq_printf(m, "partition_entitled_capacity=%d\n", entitled_capacity);
150 seq_printf(m, "partition_max_entitled_capacity=%d\n",
151 max_entitled_capacity);
154 pool_id = HvLpConfig_getSharedPoolIndex();
155 seq_printf(m, "pool=%d\n", (int)pool_id);
156 seq_printf(m, "pool_capacity=%d\n",
157 (int)(HvLpConfig_getNumProcsInSharedPool(pool_id) *
159 seq_printf(m, "purr=%ld\n", purr);
162 seq_printf(m, "shared_processor_mode=%d\n", shared);
166 #endif /* CONFIG_PPC_ISERIES */
168 #ifdef CONFIG_PPC_PSERIES
170 * Methods used to fetch LPAR data when running on a pSeries platform.
174 * H_GET_PPP hcall returns info in 4 parms.
175 * entitled_capacity,unallocated_capacity,
176 * aggregation, resource_capability).
178 * R4 = Entitled Processor Capacity Percentage.
179 * R5 = Unallocated Processor Capacity Percentage.
180 * R6 (AABBCCDDEEFFGGHH).
181 * XXXX - reserved (0)
182 * XXXX - reserved (0)
183 * XXXX - Group Number
184 * XXXX - Pool Number.
185 * R7 (IIJJKKLLMMNNOOPP).
187 * XX - bit 0-6 reserved (0). bit 7 is Capped indicator.
188 * XX - variable processor Capacity Weight
189 * XX - Unallocated Variable Processor Capacity Weight.
190 * XXXX - Active processors in Physical Processor Pool.
191 * XXXX - Processors active on platform.
193 static unsigned int h_get_ppp(unsigned long *entitled,
194 unsigned long *unallocated,
195 unsigned long *aggregation,
196 unsigned long *resource)
199 rc = plpar_hcall_4out(H_GET_PPP, 0, 0, 0, 0, entitled, unallocated,
200 aggregation, resource);
202 log_plpar_hcall_return(rc, "H_GET_PPP");
207 static void h_pic(unsigned long *pool_idle_time, unsigned long *num_procs)
211 rc = plpar_hcall(H_PIC, 0, 0, 0, 0, pool_idle_time, num_procs, &dummy);
213 log_plpar_hcall_return(rc, "H_PIC");
216 static unsigned long get_purr(void);
217 /* ToDo: get sum of purr across all processors. The purr collection code
218 * is coming, but at this time is still problematic, so for now this
219 * function will return 0.
221 static unsigned long get_purr(void)
223 unsigned long sum_purr = 0;
227 #define SPLPAR_CHARACTERISTICS_TOKEN 20
228 #define SPLPAR_MAXLENGTH 1026*(sizeof(char))
231 * parse_system_parameter_string()
232 * Retrieve the potential_processors, max_entitled_capacity and friends
233 * through the get-system-parameter rtas call. Replace keyword strings as
236 static void parse_system_parameter_string(struct seq_file *m)
240 char *local_buffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
242 printk(KERN_ERR "%s %s kmalloc failure at line %d \n",
243 __FILE__, __FUNCTION__, __LINE__);
247 spin_lock(&rtas_data_buf_lock);
248 memset(rtas_data_buf, 0, SPLPAR_MAXLENGTH);
249 call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
251 SPLPAR_CHARACTERISTICS_TOKEN,
252 __pa(rtas_data_buf));
253 memcpy(local_buffer, rtas_data_buf, SPLPAR_MAXLENGTH);
254 spin_unlock(&rtas_data_buf_lock);
256 if (call_status != 0) {
258 "%s %s Error calling get-system-parameter (0x%x)\n",
259 __FILE__, __FUNCTION__, call_status);
263 char *workbuffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
265 printk(KERN_ERR "%s %s kmalloc failure at line %d \n",
266 __FILE__, __FUNCTION__, __LINE__);
270 printk(KERN_INFO "success calling get-system-parameter \n");
272 splpar_strlen = local_buffer[0] * 16 + local_buffer[1];
273 local_buffer += 2; /* step over strlen value */
275 memset(workbuffer, 0, SPLPAR_MAXLENGTH);
278 while ((*local_buffer) && (idx < splpar_strlen)) {
279 workbuffer[w_idx++] = local_buffer[idx++];
280 if ((local_buffer[idx] == ',')
281 || (local_buffer[idx] == '\0')) {
282 workbuffer[w_idx] = '\0';
284 /* avoid the empty string */
285 seq_printf(m, "%s\n", workbuffer);
287 memset(workbuffer, 0, SPLPAR_MAXLENGTH);
288 idx++; /* skip the comma */
290 } else if (local_buffer[idx] == '=') {
291 /* code here to replace workbuffer contents
292 with different keyword strings */
293 if (0 == strcmp(workbuffer, "MaxEntCap")) {
295 "partition_max_entitled_capacity");
296 w_idx = strlen(workbuffer);
298 if (0 == strcmp(workbuffer, "MaxPlatProcs")) {
300 "system_potential_processors");
301 w_idx = strlen(workbuffer);
306 local_buffer -= 2; /* back up over strlen value */
311 static int lparcfg_count_active_processors(void);
313 /* Return the number of processors in the system.
314 * This function reads through the device tree and counts
315 * the virtual processors, this does not include threads.
317 static int lparcfg_count_active_processors(void)
319 struct device_node *cpus_dn = NULL;
322 while ((cpus_dn = of_find_node_by_type(cpus_dn, "cpu"))) {
324 printk(KERN_ERR "cpus_dn %p \n", cpus_dn);
331 static int lparcfg_data(struct seq_file *m, void *v)
333 int partition_potential_processors;
334 int partition_active_processors;
335 struct device_node *rootdn;
336 const char *model = "";
337 const char *system_id = "";
338 unsigned int *lp_index_ptr, lp_index = 0;
339 struct device_node *rtas_node;
342 rootdn = find_path_device("/");
344 model = get_property(rootdn, "model", NULL);
345 system_id = get_property(rootdn, "system-id", NULL);
346 lp_index_ptr = (unsigned int *)
347 get_property(rootdn, "ibm,partition-no", NULL);
349 lp_index = *lp_index_ptr;
352 seq_printf(m, "%s %s \n", MODULE_NAME, MODULE_VERS);
354 seq_printf(m, "serial_number=%s\n", system_id);
356 seq_printf(m, "system_type=%s\n", model);
358 seq_printf(m, "partition_id=%d\n", (int)lp_index);
360 rtas_node = find_path_device("/rtas");
361 lrdrp = (int *)get_property(rtas_node, "ibm,lrdr-capacity", NULL);
364 partition_potential_processors = systemcfg->processorCount;
366 partition_potential_processors = *(lrdrp + 4);
369 partition_active_processors = lparcfg_count_active_processors();
371 if (cur_cpu_spec->firmware_features & FW_FEATURE_SPLPAR) {
372 unsigned long h_entitled, h_unallocated;
373 unsigned long h_aggregation, h_resource;
374 unsigned long pool_idle_time, pool_procs;
377 h_get_ppp(&h_entitled, &h_unallocated, &h_aggregation,
380 seq_printf(m, "R4=0x%lx\n", h_entitled);
381 seq_printf(m, "R5=0x%lx\n", h_unallocated);
382 seq_printf(m, "R6=0x%lx\n", h_aggregation);
383 seq_printf(m, "R7=0x%lx\n", h_resource);
387 /* this call handles the ibm,get-system-parameter contents */
388 parse_system_parameter_string(m);
390 seq_printf(m, "partition_entitled_capacity=%ld\n", h_entitled);
392 seq_printf(m, "group=%ld\n", (h_aggregation >> 2 * 8) & 0xffff);
394 seq_printf(m, "system_active_processors=%ld\n",
395 (h_resource >> 0 * 8) & 0xffff);
397 /* pool related entries are apropriate for shared configs */
398 if (paca[0].lppaca.shared_proc) {
400 h_pic(&pool_idle_time, &pool_procs);
402 seq_printf(m, "pool=%ld\n",
403 (h_aggregation >> 0 * 8) & 0xffff);
405 /* report pool_capacity in percentage */
406 seq_printf(m, "pool_capacity=%ld\n",
407 ((h_resource >> 2 * 8) & 0xffff) * 100);
409 seq_printf(m, "pool_idle_time=%ld\n", pool_idle_time);
411 seq_printf(m, "pool_num_procs=%ld\n", pool_procs);
414 seq_printf(m, "unallocated_capacity_weight=%ld\n",
415 (h_resource >> 4 * 8) & 0xFF);
417 seq_printf(m, "capacity_weight=%ld\n",
418 (h_resource >> 5 * 8) & 0xFF);
420 seq_printf(m, "capped=%ld\n", (h_resource >> 6 * 8) & 0x01);
422 seq_printf(m, "unallocated_capacity=%ld\n", h_unallocated);
424 seq_printf(m, "purr=%ld\n", purr);
426 } else { /* non SPLPAR case */
428 seq_printf(m, "system_active_processors=%d\n",
429 partition_potential_processors);
431 seq_printf(m, "system_potential_processors=%d\n",
432 partition_potential_processors);
434 seq_printf(m, "partition_max_entitled_capacity=%d\n",
435 partition_potential_processors * 100);
437 seq_printf(m, "partition_entitled_capacity=%d\n",
438 partition_active_processors * 100);
441 seq_printf(m, "partition_active_processors=%d\n",
442 partition_active_processors);
444 seq_printf(m, "partition_potential_processors=%d\n",
445 partition_potential_processors);
447 seq_printf(m, "shared_processor_mode=%d\n", paca[0].lppaca.shared_proc);
453 * Interface for changing system parameters (variable capacity weight
454 * and entitled capacity). Format of input is "param_name=value";
455 * anything after value is ignored. Valid parameters at this time are
456 * "partition_entitled_capacity" and "capacity_weight". We use
457 * H_SET_PPP to alter parameters.
459 * This function should be invoked only on systems with
462 static ssize_t lparcfg_write(struct file *file, const char __user * buf,
463 size_t count, loff_t * off)
467 u64 new_entitled, *new_entitled_ptr = &new_entitled;
468 u8 new_weight, *new_weight_ptr = &new_weight;
470 unsigned long current_entitled; /* parameters for h_get_ppp */
472 unsigned long resource;
475 ssize_t retval = -ENOMEM;
477 kbuf = kmalloc(count, GFP_KERNEL);
482 if (copy_from_user(kbuf, buf, count))
486 kbuf[count - 1] = '\0';
487 tmp = strchr(kbuf, '=');
493 if (!strcmp(kbuf, "partition_entitled_capacity")) {
495 *new_entitled_ptr = (u64) simple_strtoul(tmp, &endp, 10);
498 new_weight_ptr = ¤t_weight;
499 } else if (!strcmp(kbuf, "capacity_weight")) {
501 *new_weight_ptr = (u8) simple_strtoul(tmp, &endp, 10);
504 new_entitled_ptr = ¤t_entitled;
508 /* Get our current parameters */
509 retval = h_get_ppp(¤t_entitled, &dummy, &dummy, &resource);
515 current_weight = (resource >> 5 * 8) & 0xFF;
517 pr_debug("%s: current_entitled = %lu, current_weight = %lu\n",
518 __FUNCTION__, current_entitled, current_weight);
520 pr_debug("%s: new_entitled = %lu, new_weight = %lu\n",
521 __FUNCTION__, *new_entitled_ptr, *new_weight_ptr);
523 retval = plpar_hcall_norets(H_SET_PPP, *new_entitled_ptr,
526 if (retval == H_Success || retval == H_Constrained) {
528 } else if (retval == H_Busy) {
530 } else if (retval == H_Hardware) {
532 } else if (retval == H_Parameter) {
535 printk(KERN_WARNING "%s: received unknown hv return code %ld",
536 __FUNCTION__, retval);
545 #endif /* CONFIG_PPC_PSERIES */
547 static int lparcfg_open(struct inode *inode, struct file *file)
549 return single_open(file, lparcfg_data, NULL);
552 struct file_operations lparcfg_fops = {
553 .owner = THIS_MODULE,
555 .open = lparcfg_open,
556 .release = single_release,
559 int __init lparcfg_init(void)
561 struct proc_dir_entry *ent;
562 mode_t mode = S_IRUSR;
564 /* Allow writing if we have FW_FEATURE_SPLPAR */
565 if (cur_cpu_spec->firmware_features & FW_FEATURE_SPLPAR) {
566 lparcfg_fops.write = lparcfg_write;
570 ent = create_proc_entry("ppc64/lparcfg", mode, NULL);
572 ent->proc_fops = &lparcfg_fops;
573 ent->data = kmalloc(LPARCFG_BUFF_SIZE, GFP_KERNEL);
576 "Failed to allocate buffer for lparcfg\n");
577 remove_proc_entry("lparcfg", ent->parent);
581 printk(KERN_ERR "Failed to create ppc64/lparcfg\n");
585 proc_ppc64_lparcfg = ent;
589 void __exit lparcfg_cleanup(void)
591 if (proc_ppc64_lparcfg) {
592 if (proc_ppc64_lparcfg->data) {
593 kfree(proc_ppc64_lparcfg->data);
595 remove_proc_entry("lparcfg", proc_ppc64_lparcfg->parent);
599 module_init(lparcfg_init);
600 module_exit(lparcfg_cleanup);
601 MODULE_DESCRIPTION("Interface for LPAR configuration data");
602 MODULE_AUTHOR("Dave Engebretsen");
603 MODULE_LICENSE("GPL");