1 // SPDX-License-Identifier: GPL-2.0-only
3 * Support for dynamic reconfiguration for PCI, Memory, and CPU
4 * Hotplug and Dynamic Logical Partitioning on RPA platforms.
6 * Copyright (C) 2009 Nathan Fontenot
7 * Copyright (C) 2009 IBM Corporation
10 #define pr_fmt(fmt) "dlpar: " fmt
12 #include <linux/kernel.h>
13 #include <linux/notifier.h>
14 #include <linux/spinlock.h>
15 #include <linux/cpu.h>
16 #include <linux/slab.h>
19 #include "of_helpers.h"
23 #include <asm/machdep.h>
24 #include <linux/uaccess.h>
27 static struct workqueue_struct *pseries_hp_wq;
29 struct pseries_hp_work {
30 struct work_struct work;
31 struct pseries_hp_errorlog *errlog;
42 void dlpar_free_cc_property(struct property *prop)
49 static struct property *dlpar_parse_cc_property(struct cc_workarea *ccwa)
51 struct property *prop;
55 prop = kzalloc(sizeof(*prop), GFP_KERNEL);
59 name = (char *)ccwa + be32_to_cpu(ccwa->name_offset);
60 prop->name = kstrdup(name, GFP_KERNEL);
62 dlpar_free_cc_property(prop);
66 prop->length = be32_to_cpu(ccwa->prop_length);
67 value = (char *)ccwa + be32_to_cpu(ccwa->prop_offset);
68 prop->value = kmemdup(value, prop->length, GFP_KERNEL);
70 dlpar_free_cc_property(prop);
77 static struct device_node *dlpar_parse_cc_node(struct cc_workarea *ccwa)
79 struct device_node *dn;
82 dn = kzalloc(sizeof(*dn), GFP_KERNEL);
86 name = (const char *)ccwa + be32_to_cpu(ccwa->name_offset);
87 dn->full_name = kstrdup(name, GFP_KERNEL);
93 of_node_set_flag(dn, OF_DYNAMIC);
99 static void dlpar_free_one_cc_node(struct device_node *dn)
101 struct property *prop;
103 while (dn->properties) {
104 prop = dn->properties;
105 dn->properties = prop->next;
106 dlpar_free_cc_property(prop);
109 kfree(dn->full_name);
113 void dlpar_free_cc_nodes(struct device_node *dn)
116 dlpar_free_cc_nodes(dn->child);
119 dlpar_free_cc_nodes(dn->sibling);
121 dlpar_free_one_cc_node(dn);
125 #define NEXT_SIBLING 1
127 #define NEXT_PROPERTY 3
128 #define PREV_PARENT 4
129 #define MORE_MEMORY 5
130 #define ERR_CFG_USE -9003
132 struct device_node *dlpar_configure_connector(__be32 drc_index,
133 struct device_node *parent)
135 struct device_node *dn;
136 struct device_node *first_dn = NULL;
137 struct device_node *last_dn = NULL;
138 struct property *property;
139 struct property *last_property = NULL;
140 struct cc_workarea *ccwa;
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);
170 if (rtas_busy_delay(rc))
178 dn = dlpar_parse_cc_node(ccwa);
182 dn->parent = last_dn->parent;
183 last_dn->sibling = dn;
188 dn = dlpar_parse_cc_node(ccwa);
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;
224 printk(KERN_ERR "Unexpected Error (%d) "
225 "returned from configure-connector\n", rc);
235 dlpar_free_cc_nodes(first_dn);
243 int dlpar_attach_node(struct device_node *dn, struct device_node *parent)
249 rc = of_attach_node(dn);
251 printk(KERN_ERR "Failed to add device node %pOF\n", dn);
258 int dlpar_detach_node(struct device_node *dn)
260 struct device_node *child;
263 child = of_get_next_child(dn, NULL);
265 dlpar_detach_node(child);
266 child = of_get_next_child(dn, child);
269 rc = of_detach_node(dn);
278 #define DR_ENTITY_SENSE 9003
279 #define DR_ENTITY_PRESENT 1
280 #define DR_ENTITY_UNUSABLE 2
281 #define ALLOCATION_STATE 9003
282 #define ALLOC_UNUSABLE 0
283 #define ALLOC_USABLE 1
284 #define ISOLATION_STATE 9001
288 int dlpar_acquire_drc(u32 drc_index)
292 rc = rtas_call(rtas_token("get-sensor-state"), 2, 2, &dr_status,
293 DR_ENTITY_SENSE, drc_index);
294 if (rc || dr_status != DR_ENTITY_UNUSABLE)
297 rc = rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_USABLE);
301 rc = rtas_set_indicator(ISOLATION_STATE, drc_index, UNISOLATE);
303 rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_UNUSABLE);
310 int dlpar_release_drc(u32 drc_index)
314 rc = rtas_call(rtas_token("get-sensor-state"), 2, 2, &dr_status,
315 DR_ENTITY_SENSE, drc_index);
316 if (rc || dr_status != DR_ENTITY_PRESENT)
319 rc = rtas_set_indicator(ISOLATION_STATE, drc_index, ISOLATE);
323 rc = rtas_set_indicator(ALLOCATION_STATE, drc_index, ALLOC_UNUSABLE);
325 rtas_set_indicator(ISOLATION_STATE, drc_index, UNISOLATE);
332 int handle_dlpar_errorlog(struct pseries_hp_errorlog *hp_elog)
336 /* pseries error logs are in BE format, convert to cpu type */
337 switch (hp_elog->id_type) {
338 case PSERIES_HP_ELOG_ID_DRC_COUNT:
339 hp_elog->_drc_u.drc_count =
340 be32_to_cpu(hp_elog->_drc_u.drc_count);
342 case PSERIES_HP_ELOG_ID_DRC_INDEX:
343 hp_elog->_drc_u.drc_index =
344 be32_to_cpu(hp_elog->_drc_u.drc_index);
346 case PSERIES_HP_ELOG_ID_DRC_IC:
347 hp_elog->_drc_u.ic.count =
348 be32_to_cpu(hp_elog->_drc_u.ic.count);
349 hp_elog->_drc_u.ic.index =
350 be32_to_cpu(hp_elog->_drc_u.ic.index);
353 switch (hp_elog->resource) {
354 case PSERIES_HP_ELOG_RESOURCE_MEM:
355 rc = dlpar_memory(hp_elog);
357 case PSERIES_HP_ELOG_RESOURCE_CPU:
358 rc = dlpar_cpu(hp_elog);
360 case PSERIES_HP_ELOG_RESOURCE_PMEM:
361 rc = dlpar_hp_pmem(hp_elog);
365 pr_warn_ratelimited("Invalid resource (%d) specified\n",
373 static void pseries_hp_work_fn(struct work_struct *work)
375 struct pseries_hp_work *hp_work =
376 container_of(work, struct pseries_hp_work, work);
378 handle_dlpar_errorlog(hp_work->errlog);
380 kfree(hp_work->errlog);
384 void queue_hotplug_event(struct pseries_hp_errorlog *hp_errlog)
386 struct pseries_hp_work *work;
387 struct pseries_hp_errorlog *hp_errlog_copy;
389 hp_errlog_copy = kmemdup(hp_errlog, sizeof(*hp_errlog), GFP_ATOMIC);
393 work = kmalloc(sizeof(struct pseries_hp_work), GFP_ATOMIC);
395 INIT_WORK((struct work_struct *)work, pseries_hp_work_fn);
396 work->errlog = hp_errlog_copy;
397 queue_work(pseries_hp_wq, (struct work_struct *)work);
399 kfree(hp_errlog_copy);
403 static int dlpar_parse_resource(char **cmd, struct pseries_hp_errorlog *hp_elog)
407 arg = strsep(cmd, " ");
411 if (sysfs_streq(arg, "memory")) {
412 hp_elog->resource = PSERIES_HP_ELOG_RESOURCE_MEM;
413 } else if (sysfs_streq(arg, "cpu")) {
414 hp_elog->resource = PSERIES_HP_ELOG_RESOURCE_CPU;
416 pr_err("Invalid resource specified.\n");
423 static int dlpar_parse_action(char **cmd, struct pseries_hp_errorlog *hp_elog)
427 arg = strsep(cmd, " ");
431 if (sysfs_streq(arg, "add")) {
432 hp_elog->action = PSERIES_HP_ELOG_ACTION_ADD;
433 } else if (sysfs_streq(arg, "remove")) {
434 hp_elog->action = PSERIES_HP_ELOG_ACTION_REMOVE;
436 pr_err("Invalid action specified.\n");
443 static int dlpar_parse_id_type(char **cmd, struct pseries_hp_errorlog *hp_elog)
448 arg = strsep(cmd, " ");
452 if (sysfs_streq(arg, "indexed-count")) {
453 hp_elog->id_type = PSERIES_HP_ELOG_ID_DRC_IC;
454 arg = strsep(cmd, " ");
456 pr_err("No DRC count specified.\n");
460 if (kstrtou32(arg, 0, &count)) {
461 pr_err("Invalid DRC count specified.\n");
465 arg = strsep(cmd, " ");
467 pr_err("No DRC Index specified.\n");
471 if (kstrtou32(arg, 0, &index)) {
472 pr_err("Invalid DRC Index specified.\n");
476 hp_elog->_drc_u.ic.count = cpu_to_be32(count);
477 hp_elog->_drc_u.ic.index = cpu_to_be32(index);
478 } else if (sysfs_streq(arg, "index")) {
479 hp_elog->id_type = PSERIES_HP_ELOG_ID_DRC_INDEX;
480 arg = strsep(cmd, " ");
482 pr_err("No DRC Index specified.\n");
486 if (kstrtou32(arg, 0, &index)) {
487 pr_err("Invalid DRC Index specified.\n");
491 hp_elog->_drc_u.drc_index = cpu_to_be32(index);
492 } else if (sysfs_streq(arg, "count")) {
493 hp_elog->id_type = PSERIES_HP_ELOG_ID_DRC_COUNT;
494 arg = strsep(cmd, " ");
496 pr_err("No DRC count specified.\n");
500 if (kstrtou32(arg, 0, &count)) {
501 pr_err("Invalid DRC count specified.\n");
505 hp_elog->_drc_u.drc_count = cpu_to_be32(count);
507 pr_err("Invalid id_type specified.\n");
514 static ssize_t dlpar_store(struct class *class, struct class_attribute *attr,
515 const char *buf, size_t count)
517 struct pseries_hp_errorlog hp_elog;
522 args = argbuf = kstrdup(buf, GFP_KERNEL);
524 pr_info("Could not allocate resources for DLPAR operation\n");
530 * Parse out the request from the user, this will be in the form:
531 * <resource> <action> <id_type> <id>
533 rc = dlpar_parse_resource(&args, &hp_elog);
535 goto dlpar_store_out;
537 rc = dlpar_parse_action(&args, &hp_elog);
539 goto dlpar_store_out;
541 rc = dlpar_parse_id_type(&args, &hp_elog);
543 goto dlpar_store_out;
545 rc = handle_dlpar_errorlog(&hp_elog);
551 pr_err("Could not handle DLPAR request \"%s\"\n", buf);
553 return rc ? rc : count;
556 static ssize_t dlpar_show(struct class *class, struct class_attribute *attr,
559 return sprintf(buf, "%s\n", "memory,cpu");
562 static CLASS_ATTR_RW(dlpar);
564 int __init dlpar_workqueue_init(void)
569 pseries_hp_wq = alloc_workqueue("pseries hotplug workqueue",
572 return pseries_hp_wq ? 0 : -ENOMEM;
575 static int __init dlpar_sysfs_init(void)
579 rc = dlpar_workqueue_init();
583 return sysfs_create_file(kernel_kobj, &class_attr_dlpar.attr);
585 machine_device_initcall(pseries, dlpar_sysfs_init);