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>
22 #include "of_helpers.h"
26 #include <asm/machdep.h>
27 #include <linux/uaccess.h>
30 static struct workqueue_struct
*pseries_hp_wq
;
32 struct pseries_hp_work
{
33 struct work_struct work
;
34 struct pseries_hp_errorlog
*errlog
;
45 void dlpar_free_cc_property(struct property
*prop
)
52 static struct property
*dlpar_parse_cc_property(struct cc_workarea
*ccwa
)
54 struct property
*prop
;
58 prop
= kzalloc(sizeof(*prop
), GFP_KERNEL
);
62 name
= (char *)ccwa
+ be32_to_cpu(ccwa
->name_offset
);
63 prop
->name
= kstrdup(name
, GFP_KERNEL
);
65 prop
->length
= be32_to_cpu(ccwa
->prop_length
);
66 value
= (char *)ccwa
+ be32_to_cpu(ccwa
->prop_offset
);
67 prop
->value
= kmemdup(value
, prop
->length
, GFP_KERNEL
);
69 dlpar_free_cc_property(prop
);
76 static struct device_node
*dlpar_parse_cc_node(struct cc_workarea
*ccwa
)
78 struct device_node
*dn
;
81 dn
= kzalloc(sizeof(*dn
), GFP_KERNEL
);
85 name
= (const char *)ccwa
+ be32_to_cpu(ccwa
->name_offset
);
86 dn
->full_name
= kstrdup(name
, GFP_KERNEL
);
92 of_node_set_flag(dn
, OF_DYNAMIC
);
98 static void dlpar_free_one_cc_node(struct device_node
*dn
)
100 struct property
*prop
;
102 while (dn
->properties
) {
103 prop
= dn
->properties
;
104 dn
->properties
= prop
->next
;
105 dlpar_free_cc_property(prop
);
108 kfree(dn
->full_name
);
112 void dlpar_free_cc_nodes(struct device_node
*dn
)
115 dlpar_free_cc_nodes(dn
->child
);
118 dlpar_free_cc_nodes(dn
->sibling
);
120 dlpar_free_one_cc_node(dn
);
124 #define NEXT_SIBLING 1
126 #define NEXT_PROPERTY 3
127 #define PREV_PARENT 4
128 #define MORE_MEMORY 5
129 #define CALL_AGAIN -2
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
);
175 dn
= dlpar_parse_cc_node(ccwa
);
179 dn
->parent
= last_dn
->parent
;
180 last_dn
->sibling
= dn
;
185 dn
= dlpar_parse_cc_node(ccwa
);
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
;
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
= kmalloc(sizeof(struct pseries_hp_errorlog
),
391 memcpy(hp_errlog_copy
, hp_errlog
, sizeof(struct pseries_hp_errorlog
));
393 work
= kmalloc(sizeof(struct pseries_hp_work
), GFP_KERNEL
);
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
);