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 #include <linux/kernel.h>
14 #include <linux/notifier.h>
15 #include <linux/spinlock.h>
16 #include <linux/cpu.h>
17 #include <linux/slab.h>
19 #include "offline_states.h"
22 #include <asm/machdep.h>
23 #include <asm/uaccess.h>
34 void dlpar_free_cc_property(struct property *prop)
41 static struct property *dlpar_parse_cc_property(struct cc_workarea *ccwa)
43 struct property *prop;
47 prop = kzalloc(sizeof(*prop), GFP_KERNEL);
51 name = (char *)ccwa + ccwa->name_offset;
52 prop->name = kstrdup(name, GFP_KERNEL);
54 prop->length = ccwa->prop_length;
55 value = (char *)ccwa + ccwa->prop_offset;
56 prop->value = kmemdup(value, prop->length, GFP_KERNEL);
58 dlpar_free_cc_property(prop);
65 static struct device_node *dlpar_parse_cc_node(struct cc_workarea *ccwa,
68 struct device_node *dn;
71 /* If parent node path is "/" advance path to NULL terminator to
72 * prevent double leading slashs in full_name.
77 dn = kzalloc(sizeof(*dn), GFP_KERNEL);
81 name = (char *)ccwa + ccwa->name_offset;
82 dn->full_name = kasprintf(GFP_KERNEL, "%s/%s", path, name);
88 of_node_set_flag(dn, OF_DYNAMIC);
94 static void dlpar_free_one_cc_node(struct device_node *dn)
96 struct property *prop;
98 while (dn->properties) {
99 prop = dn->properties;
100 dn->properties = prop->next;
101 dlpar_free_cc_property(prop);
104 kfree(dn->full_name);
108 void dlpar_free_cc_nodes(struct device_node *dn)
111 dlpar_free_cc_nodes(dn->child);
114 dlpar_free_cc_nodes(dn->sibling);
116 dlpar_free_one_cc_node(dn);
120 #define NEXT_SIBLING 1
122 #define NEXT_PROPERTY 3
123 #define PREV_PARENT 4
124 #define MORE_MEMORY 5
125 #define CALL_AGAIN -2
126 #define ERR_CFG_USE -9003
128 struct device_node *dlpar_configure_connector(u32 drc_index,
129 struct device_node *parent)
131 struct device_node *dn;
132 struct device_node *first_dn = NULL;
133 struct device_node *last_dn = NULL;
134 struct property *property;
135 struct property *last_property = NULL;
136 struct cc_workarea *ccwa;
138 const char *parent_path = parent->full_name;
142 cc_token = rtas_token("ibm,configure-connector");
143 if (cc_token == RTAS_UNKNOWN_SERVICE)
146 data_buf = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL);
150 ccwa = (struct cc_workarea *)&data_buf[0];
151 ccwa->drc_index = drc_index;
155 /* Since we release the rtas_data_buf lock between configure
156 * connector calls we want to re-populate the rtas_data_buffer
157 * with the contents of the previous call.
159 spin_lock(&rtas_data_buf_lock);
161 memcpy(rtas_data_buf, data_buf, RTAS_DATA_BUF_SIZE);
162 rc = rtas_call(cc_token, 2, 1, NULL, rtas_data_buf, NULL);
163 memcpy(data_buf, rtas_data_buf, RTAS_DATA_BUF_SIZE);
165 spin_unlock(&rtas_data_buf_lock);
172 dn = dlpar_parse_cc_node(ccwa, parent_path);
176 dn->parent = last_dn->parent;
177 last_dn->sibling = dn;
183 parent_path = last_dn->full_name;
185 dn = dlpar_parse_cc_node(ccwa, parent_path);
193 dn->parent = last_dn;
202 property = dlpar_parse_cc_property(ccwa);
206 if (!last_dn->properties)
207 last_dn->properties = property;
209 last_property->next = property;
211 last_property = property;
215 last_dn = last_dn->parent;
216 parent_path = last_dn->parent->full_name;
225 printk(KERN_ERR "Unexpected Error (%d) "
226 "returned from configure-connector\n", rc);
236 dlpar_free_cc_nodes(first_dn);
244 static struct device_node *derive_parent(const char *path)
246 struct device_node *parent;
249 last_slash = strrchr(path, '/');
250 if (last_slash == path) {
251 parent = of_find_node_by_path("/");
254 int parent_path_len = last_slash - path + 1;
255 parent_path = kmalloc(parent_path_len, GFP_KERNEL);
259 strlcpy(parent_path, path, parent_path_len);
260 parent = of_find_node_by_path(parent_path);
267 int dlpar_attach_node(struct device_node *dn)
271 dn->parent = derive_parent(dn->full_name);
275 rc = of_attach_node(dn);
277 printk(KERN_ERR "Failed to add device node %s\n",
282 of_node_put(dn->parent);
286 int dlpar_detach_node(struct device_node *dn)
288 struct device_node *child;
291 child = of_get_next_child(dn, NULL);
293 dlpar_detach_node(child);
294 child = of_get_next_child(dn, child);
297 rc = of_detach_node(dn);
301 of_node_put(dn); /* Must decrement the refcount */
305 #define DR_ENTITY_SENSE 9003
306 #define DR_ENTITY_PRESENT 1
307 #define DR_ENTITY_UNUSABLE 2
308 #define ALLOCATION_STATE 9003
309 #define ALLOC_UNUSABLE 0
310 #define ALLOC_USABLE 1
311 #define ISOLATION_STATE 9001
315 int dlpar_acquire_drc(u32 drc_index)
319 rc = rtas_call(rtas_token("get-sensor-state"), 2, 2, &dr_status,
320 DR_ENTITY_SENSE, drc_index);
321 if (rc || dr_status != DR_ENTITY_UNUSABLE)
324 rc = rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_USABLE);
328 rc = rtas_set_indicator(ISOLATION_STATE, drc_index, UNISOLATE);
330 rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_UNUSABLE);
337 int dlpar_release_drc(u32 drc_index)
341 rc = rtas_call(rtas_token("get-sensor-state"), 2, 2, &dr_status,
342 DR_ENTITY_SENSE, drc_index);
343 if (rc || dr_status != DR_ENTITY_PRESENT)
346 rc = rtas_set_indicator(ISOLATION_STATE, drc_index, ISOLATE);
350 rc = rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_UNUSABLE);
352 rtas_set_indicator(ISOLATION_STATE, drc_index, UNISOLATE);
359 #ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
361 static int dlpar_online_cpu(struct device_node *dn)
365 int len, nthreads, i;
368 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", &len);
372 nthreads = len / sizeof(u32);
374 cpu_maps_update_begin();
375 for (i = 0; i < nthreads; i++) {
376 for_each_present_cpu(cpu) {
377 if (get_hard_smp_processor_id(cpu) != intserv[i])
379 BUG_ON(get_cpu_current_state(cpu)
380 != CPU_STATE_OFFLINE);
381 cpu_maps_update_done();
385 cpu_maps_update_begin();
389 if (cpu == num_possible_cpus())
390 printk(KERN_WARNING "Could not find cpu to online "
391 "with physical id 0x%x\n", intserv[i]);
393 cpu_maps_update_done();
400 static ssize_t dlpar_cpu_probe(const char *buf, size_t count)
402 struct device_node *dn, *parent;
406 rc = kstrtou32(buf, 0, &drc_index);
410 parent = of_find_node_by_path("/cpus");
414 dn = dlpar_configure_connector(drc_index, parent);
420 rc = dlpar_acquire_drc(drc_index);
422 dlpar_free_cc_nodes(dn);
426 rc = dlpar_attach_node(dn);
428 dlpar_release_drc(drc_index);
429 dlpar_free_cc_nodes(dn);
433 rc = dlpar_online_cpu(dn);
440 static int dlpar_offline_cpu(struct device_node *dn)
444 int len, nthreads, i;
447 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", &len);
451 nthreads = len / sizeof(u32);
453 cpu_maps_update_begin();
454 for (i = 0; i < nthreads; i++) {
455 for_each_present_cpu(cpu) {
456 if (get_hard_smp_processor_id(cpu) != intserv[i])
459 if (get_cpu_current_state(cpu) == CPU_STATE_OFFLINE)
462 if (get_cpu_current_state(cpu) == CPU_STATE_ONLINE) {
463 set_preferred_offline_state(cpu, CPU_STATE_OFFLINE);
464 cpu_maps_update_done();
468 cpu_maps_update_begin();
474 * The cpu is in CPU_STATE_INACTIVE.
475 * Upgrade it's state to CPU_STATE_OFFLINE.
477 set_preferred_offline_state(cpu, CPU_STATE_OFFLINE);
478 BUG_ON(plpar_hcall_norets(H_PROD, intserv[i])
483 if (cpu == num_possible_cpus())
484 printk(KERN_WARNING "Could not find cpu to offline "
485 "with physical id 0x%x\n", intserv[i]);
487 cpu_maps_update_done();
494 static ssize_t dlpar_cpu_release(const char *buf, size_t count)
496 struct device_node *dn;
497 const u32 *drc_index;
500 dn = of_find_node_by_path(buf);
504 drc_index = of_get_property(dn, "ibm,my-drc-index", NULL);
510 rc = dlpar_offline_cpu(dn);
516 rc = dlpar_release_drc(*drc_index);
522 rc = dlpar_detach_node(dn);
524 dlpar_acquire_drc(*drc_index);
533 static int __init pseries_dlpar_init(void)
535 ppc_md.cpu_probe = dlpar_cpu_probe;
536 ppc_md.cpu_release = dlpar_cpu_release;
540 machine_device_initcall(pseries, pseries_dlpar_init);
542 #endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */