2 * Support for dynamic reconfiguration for PCI, Memory, and CPU
3 * Hotplug and Dynamic Logical Partitioning on RPA platforms.
5 * Copyright (C) 2009 Nathan Fontenot
6 * Copyright (C) 2009 IBM Corporation
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License version
10 * 2 as published by the Free Software Foundation.
13 #define pr_fmt(fmt) "dlpar: " fmt
15 #include <linux/kernel.h>
16 #include <linux/notifier.h>
17 #include <linux/spinlock.h>
18 #include <linux/cpu.h>
19 #include <linux/slab.h>
21 #include "offline_states.h"
25 #include <asm/machdep.h>
26 #include <asm/uaccess.h>
37 void dlpar_free_cc_property(struct property *prop)
44 static struct property *dlpar_parse_cc_property(struct cc_workarea *ccwa)
46 struct property *prop;
50 prop = kzalloc(sizeof(*prop), GFP_KERNEL);
54 name = (char *)ccwa + be32_to_cpu(ccwa->name_offset);
55 prop->name = kstrdup(name, GFP_KERNEL);
57 prop->length = be32_to_cpu(ccwa->prop_length);
58 value = (char *)ccwa + be32_to_cpu(ccwa->prop_offset);
59 prop->value = kmemdup(value, prop->length, GFP_KERNEL);
61 dlpar_free_cc_property(prop);
68 static struct device_node *dlpar_parse_cc_node(struct cc_workarea *ccwa,
71 struct device_node *dn;
74 /* If parent node path is "/" advance path to NULL terminator to
75 * prevent double leading slashs in full_name.
80 dn = kzalloc(sizeof(*dn), GFP_KERNEL);
84 name = (char *)ccwa + be32_to_cpu(ccwa->name_offset);
85 dn->full_name = kasprintf(GFP_KERNEL, "%s/%s", path, name);
91 of_node_set_flag(dn, OF_DYNAMIC);
97 static void dlpar_free_one_cc_node(struct device_node *dn)
99 struct property *prop;
101 while (dn->properties) {
102 prop = dn->properties;
103 dn->properties = prop->next;
104 dlpar_free_cc_property(prop);
107 kfree(dn->full_name);
111 void dlpar_free_cc_nodes(struct device_node *dn)
114 dlpar_free_cc_nodes(dn->child);
117 dlpar_free_cc_nodes(dn->sibling);
119 dlpar_free_one_cc_node(dn);
123 #define NEXT_SIBLING 1
125 #define NEXT_PROPERTY 3
126 #define PREV_PARENT 4
127 #define MORE_MEMORY 5
128 #define CALL_AGAIN -2
129 #define ERR_CFG_USE -9003
131 struct device_node *dlpar_configure_connector(__be32 drc_index,
132 struct device_node *parent)
134 struct device_node *dn;
135 struct device_node *first_dn = NULL;
136 struct device_node *last_dn = NULL;
137 struct property *property;
138 struct property *last_property = NULL;
139 struct cc_workarea *ccwa;
141 const char *parent_path = parent->full_name;
145 cc_token = rtas_token("ibm,configure-connector");
146 if (cc_token == RTAS_UNKNOWN_SERVICE)
149 data_buf = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL);
153 ccwa = (struct cc_workarea *)&data_buf[0];
154 ccwa->drc_index = drc_index;
158 /* Since we release the rtas_data_buf lock between configure
159 * connector calls we want to re-populate the rtas_data_buffer
160 * with the contents of the previous call.
162 spin_lock(&rtas_data_buf_lock);
164 memcpy(rtas_data_buf, data_buf, RTAS_DATA_BUF_SIZE);
165 rc = rtas_call(cc_token, 2, 1, NULL, rtas_data_buf, NULL);
166 memcpy(data_buf, rtas_data_buf, RTAS_DATA_BUF_SIZE);
168 spin_unlock(&rtas_data_buf_lock);
175 dn = dlpar_parse_cc_node(ccwa, parent_path);
179 dn->parent = last_dn->parent;
180 last_dn->sibling = dn;
186 parent_path = last_dn->full_name;
188 dn = dlpar_parse_cc_node(ccwa, parent_path);
196 dn->parent = last_dn;
205 property = dlpar_parse_cc_property(ccwa);
209 if (!last_dn->properties)
210 last_dn->properties = property;
212 last_property->next = property;
214 last_property = property;
218 last_dn = last_dn->parent;
219 parent_path = last_dn->parent->full_name;
228 printk(KERN_ERR "Unexpected Error (%d) "
229 "returned from configure-connector\n", rc);
239 dlpar_free_cc_nodes(first_dn);
247 static struct device_node *derive_parent(const char *path)
249 struct device_node *parent;
252 last_slash = strrchr(path, '/');
253 if (last_slash == path) {
254 parent = of_find_node_by_path("/");
257 int parent_path_len = last_slash - path + 1;
258 parent_path = kmalloc(parent_path_len, GFP_KERNEL);
262 strlcpy(parent_path, path, parent_path_len);
263 parent = of_find_node_by_path(parent_path);
270 int dlpar_attach_node(struct device_node *dn)
274 dn->parent = derive_parent(dn->full_name);
278 rc = of_attach_node(dn);
280 printk(KERN_ERR "Failed to add device node %s\n",
285 of_node_put(dn->parent);
289 int dlpar_detach_node(struct device_node *dn)
291 struct device_node *child;
294 child = of_get_next_child(dn, NULL);
296 dlpar_detach_node(child);
297 child = of_get_next_child(dn, child);
300 rc = of_detach_node(dn);
304 of_node_put(dn); /* Must decrement the refcount */
308 #define DR_ENTITY_SENSE 9003
309 #define DR_ENTITY_PRESENT 1
310 #define DR_ENTITY_UNUSABLE 2
311 #define ALLOCATION_STATE 9003
312 #define ALLOC_UNUSABLE 0
313 #define ALLOC_USABLE 1
314 #define ISOLATION_STATE 9001
318 int dlpar_acquire_drc(u32 drc_index)
322 rc = rtas_call(rtas_token("get-sensor-state"), 2, 2, &dr_status,
323 DR_ENTITY_SENSE, drc_index);
324 if (rc || dr_status != DR_ENTITY_UNUSABLE)
327 rc = rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_USABLE);
331 rc = rtas_set_indicator(ISOLATION_STATE, drc_index, UNISOLATE);
333 rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_UNUSABLE);
340 int dlpar_release_drc(u32 drc_index)
344 rc = rtas_call(rtas_token("get-sensor-state"), 2, 2, &dr_status,
345 DR_ENTITY_SENSE, drc_index);
346 if (rc || dr_status != DR_ENTITY_PRESENT)
349 rc = rtas_set_indicator(ISOLATION_STATE, drc_index, ISOLATE);
353 rc = rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_UNUSABLE);
355 rtas_set_indicator(ISOLATION_STATE, drc_index, UNISOLATE);
362 #ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
364 static int dlpar_online_cpu(struct device_node *dn)
368 int len, nthreads, i;
369 const __be32 *intserv;
372 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", &len);
376 nthreads = len / sizeof(u32);
378 cpu_maps_update_begin();
379 for (i = 0; i < nthreads; i++) {
380 thread = be32_to_cpu(intserv[i]);
381 for_each_present_cpu(cpu) {
382 if (get_hard_smp_processor_id(cpu) != thread)
384 BUG_ON(get_cpu_current_state(cpu)
385 != CPU_STATE_OFFLINE);
386 cpu_maps_update_done();
387 rc = device_online(get_cpu_device(cpu));
390 cpu_maps_update_begin();
394 if (cpu == num_possible_cpus())
395 printk(KERN_WARNING "Could not find cpu to online "
396 "with physical id 0x%x\n", thread);
398 cpu_maps_update_done();
405 static ssize_t dlpar_cpu_probe(const char *buf, size_t count)
407 struct device_node *dn, *parent;
411 rc = kstrtou32(buf, 0, &drc_index);
415 rc = dlpar_acquire_drc(drc_index);
419 parent = of_find_node_by_path("/cpus");
423 dn = dlpar_configure_connector(cpu_to_be32(drc_index), parent);
426 dlpar_release_drc(drc_index);
430 rc = dlpar_attach_node(dn);
432 dlpar_release_drc(drc_index);
433 dlpar_free_cc_nodes(dn);
437 rc = dlpar_online_cpu(dn);
444 static int dlpar_offline_cpu(struct device_node *dn)
448 int len, nthreads, i;
449 const __be32 *intserv;
452 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", &len);
456 nthreads = len / sizeof(u32);
458 cpu_maps_update_begin();
459 for (i = 0; i < nthreads; i++) {
460 thread = be32_to_cpu(intserv[i]);
461 for_each_present_cpu(cpu) {
462 if (get_hard_smp_processor_id(cpu) != thread)
465 if (get_cpu_current_state(cpu) == CPU_STATE_OFFLINE)
468 if (get_cpu_current_state(cpu) == CPU_STATE_ONLINE) {
469 set_preferred_offline_state(cpu, CPU_STATE_OFFLINE);
470 cpu_maps_update_done();
471 rc = device_offline(get_cpu_device(cpu));
474 cpu_maps_update_begin();
480 * The cpu is in CPU_STATE_INACTIVE.
481 * Upgrade it's state to CPU_STATE_OFFLINE.
483 set_preferred_offline_state(cpu, CPU_STATE_OFFLINE);
484 BUG_ON(plpar_hcall_norets(H_PROD, thread)
489 if (cpu == num_possible_cpus())
490 printk(KERN_WARNING "Could not find cpu to offline "
491 "with physical id 0x%x\n", thread);
493 cpu_maps_update_done();
500 static ssize_t dlpar_cpu_release(const char *buf, size_t count)
502 struct device_node *dn;
506 dn = of_find_node_by_path(buf);
510 rc = of_property_read_u32(dn, "ibm,my-drc-index", &drc_index);
516 rc = dlpar_offline_cpu(dn);
522 rc = dlpar_release_drc(drc_index);
528 rc = dlpar_detach_node(dn);
530 dlpar_acquire_drc(drc_index);
539 #endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */
541 static int handle_dlpar_errorlog(struct pseries_hp_errorlog *hp_elog)
545 /* pseries error logs are in BE format, convert to cpu type */
546 switch (hp_elog->id_type) {
547 case PSERIES_HP_ELOG_ID_DRC_COUNT:
548 hp_elog->_drc_u.drc_count =
549 be32_to_cpu(hp_elog->_drc_u.drc_count);
551 case PSERIES_HP_ELOG_ID_DRC_INDEX:
552 hp_elog->_drc_u.drc_index =
553 be32_to_cpu(hp_elog->_drc_u.drc_index);
556 switch (hp_elog->resource) {
557 case PSERIES_HP_ELOG_RESOURCE_MEM:
558 rc = dlpar_memory(hp_elog);
561 pr_warn_ratelimited("Invalid resource (%d) specified\n",
569 static ssize_t dlpar_store(struct class *class, struct class_attribute *attr,
570 const char *buf, size_t count)
572 struct pseries_hp_errorlog *hp_elog;
576 hp_elog = kzalloc(sizeof(*hp_elog), GFP_KERNEL);
579 goto dlpar_store_out;
582 /* Parse out the request from the user, this will be in the form
583 * <resource> <action> <id_type> <id>
586 if (!strncmp(arg, "memory", 6)) {
587 hp_elog->resource = PSERIES_HP_ELOG_RESOURCE_MEM;
588 arg += strlen("memory ");
590 pr_err("Invalid resource specified: \"%s\"\n", buf);
592 goto dlpar_store_out;
595 if (!strncmp(arg, "add", 3)) {
596 hp_elog->action = PSERIES_HP_ELOG_ACTION_ADD;
597 arg += strlen("add ");
598 } else if (!strncmp(arg, "remove", 6)) {
599 hp_elog->action = PSERIES_HP_ELOG_ACTION_REMOVE;
600 arg += strlen("remove ");
602 pr_err("Invalid action specified: \"%s\"\n", buf);
604 goto dlpar_store_out;
607 if (!strncmp(arg, "index", 5)) {
610 hp_elog->id_type = PSERIES_HP_ELOG_ID_DRC_INDEX;
611 arg += strlen("index ");
612 if (kstrtou32(arg, 0, &index)) {
614 pr_err("Invalid drc_index specified: \"%s\"\n", buf);
615 goto dlpar_store_out;
618 hp_elog->_drc_u.drc_index = cpu_to_be32(index);
619 } else if (!strncmp(arg, "count", 5)) {
622 hp_elog->id_type = PSERIES_HP_ELOG_ID_DRC_COUNT;
623 arg += strlen("count ");
624 if (kstrtou32(arg, 0, &count)) {
626 pr_err("Invalid count specified: \"%s\"\n", buf);
627 goto dlpar_store_out;
630 hp_elog->_drc_u.drc_count = cpu_to_be32(count);
632 pr_err("Invalid id_type specified: \"%s\"\n", buf);
634 goto dlpar_store_out;
637 rc = handle_dlpar_errorlog(hp_elog);
641 return rc ? rc : count;
644 static CLASS_ATTR(dlpar, S_IWUSR, NULL, dlpar_store);
646 static int __init pseries_dlpar_init(void)
650 #ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
651 ppc_md.cpu_probe = dlpar_cpu_probe;
652 ppc_md.cpu_release = dlpar_cpu_release;
653 #endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */
655 rc = sysfs_create_file(kernel_kobj, &class_attr_dlpar.attr);
659 machine_device_initcall(pseries, pseries_dlpar_init);