]>
git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/blob - arch/powerpc/platforms/pseries/dlpar.c
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"
23 #include <asm/machdep.h>
24 #include <asm/uaccess.h>
35 void dlpar_free_cc_property(struct property
*prop
)
42 static struct property
*dlpar_parse_cc_property(struct cc_workarea
*ccwa
)
44 struct property
*prop
;
48 prop
= kzalloc(sizeof(*prop
), GFP_KERNEL
);
52 name
= (char *)ccwa
+ be32_to_cpu(ccwa
->name_offset
);
53 prop
->name
= kstrdup(name
, GFP_KERNEL
);
55 prop
->length
= be32_to_cpu(ccwa
->prop_length
);
56 value
= (char *)ccwa
+ be32_to_cpu(ccwa
->prop_offset
);
57 prop
->value
= kmemdup(value
, prop
->length
, GFP_KERNEL
);
59 dlpar_free_cc_property(prop
);
66 static struct device_node
*dlpar_parse_cc_node(struct cc_workarea
*ccwa
,
69 struct device_node
*dn
;
72 /* If parent node path is "/" advance path to NULL terminator to
73 * prevent double leading slashs in full_name.
78 dn
= kzalloc(sizeof(*dn
), GFP_KERNEL
);
82 name
= (char *)ccwa
+ be32_to_cpu(ccwa
->name_offset
);
83 dn
->full_name
= kasprintf(GFP_KERNEL
, "%s/%s", path
, name
);
89 of_node_set_flag(dn
, OF_DYNAMIC
);
95 static void dlpar_free_one_cc_node(struct device_node
*dn
)
97 struct property
*prop
;
99 while (dn
->properties
) {
100 prop
= dn
->properties
;
101 dn
->properties
= prop
->next
;
102 dlpar_free_cc_property(prop
);
105 kfree(dn
->full_name
);
109 void dlpar_free_cc_nodes(struct device_node
*dn
)
112 dlpar_free_cc_nodes(dn
->child
);
115 dlpar_free_cc_nodes(dn
->sibling
);
117 dlpar_free_one_cc_node(dn
);
121 #define NEXT_SIBLING 1
123 #define NEXT_PROPERTY 3
124 #define PREV_PARENT 4
125 #define MORE_MEMORY 5
126 #define CALL_AGAIN -2
127 #define ERR_CFG_USE -9003
129 struct device_node
*dlpar_configure_connector(__be32 drc_index
,
130 struct device_node
*parent
)
132 struct device_node
*dn
;
133 struct device_node
*first_dn
= NULL
;
134 struct device_node
*last_dn
= NULL
;
135 struct property
*property
;
136 struct property
*last_property
= NULL
;
137 struct cc_workarea
*ccwa
;
139 const char *parent_path
= parent
->full_name
;
143 cc_token
= rtas_token("ibm,configure-connector");
144 if (cc_token
== RTAS_UNKNOWN_SERVICE
)
147 data_buf
= kzalloc(RTAS_DATA_BUF_SIZE
, GFP_KERNEL
);
151 ccwa
= (struct cc_workarea
*)&data_buf
[0];
152 ccwa
->drc_index
= drc_index
;
156 /* Since we release the rtas_data_buf lock between configure
157 * connector calls we want to re-populate the rtas_data_buffer
158 * with the contents of the previous call.
160 spin_lock(&rtas_data_buf_lock
);
162 memcpy(rtas_data_buf
, data_buf
, RTAS_DATA_BUF_SIZE
);
163 rc
= rtas_call(cc_token
, 2, 1, NULL
, rtas_data_buf
, NULL
);
164 memcpy(data_buf
, rtas_data_buf
, RTAS_DATA_BUF_SIZE
);
166 spin_unlock(&rtas_data_buf_lock
);
173 dn
= dlpar_parse_cc_node(ccwa
, parent_path
);
177 dn
->parent
= last_dn
->parent
;
178 last_dn
->sibling
= dn
;
184 parent_path
= last_dn
->full_name
;
186 dn
= dlpar_parse_cc_node(ccwa
, parent_path
);
194 dn
->parent
= last_dn
;
203 property
= dlpar_parse_cc_property(ccwa
);
207 if (!last_dn
->properties
)
208 last_dn
->properties
= property
;
210 last_property
->next
= property
;
212 last_property
= property
;
216 last_dn
= last_dn
->parent
;
217 parent_path
= last_dn
->parent
->full_name
;
226 printk(KERN_ERR
"Unexpected Error (%d) "
227 "returned from configure-connector\n", rc
);
237 dlpar_free_cc_nodes(first_dn
);
245 static struct device_node
*derive_parent(const char *path
)
247 struct device_node
*parent
;
250 last_slash
= strrchr(path
, '/');
251 if (last_slash
== path
) {
252 parent
= of_find_node_by_path("/");
255 int parent_path_len
= last_slash
- path
+ 1;
256 parent_path
= kmalloc(parent_path_len
, GFP_KERNEL
);
260 strlcpy(parent_path
, path
, parent_path_len
);
261 parent
= of_find_node_by_path(parent_path
);
268 int dlpar_attach_node(struct device_node
*dn
)
272 dn
->parent
= derive_parent(dn
->full_name
);
276 rc
= of_attach_node(dn
);
278 printk(KERN_ERR
"Failed to add device node %s\n",
283 of_node_put(dn
->parent
);
287 int dlpar_detach_node(struct device_node
*dn
)
289 struct device_node
*child
;
292 child
= of_get_next_child(dn
, NULL
);
294 dlpar_detach_node(child
);
295 child
= of_get_next_child(dn
, child
);
298 rc
= of_detach_node(dn
);
302 of_node_put(dn
); /* Must decrement the refcount */
306 #define DR_ENTITY_SENSE 9003
307 #define DR_ENTITY_PRESENT 1
308 #define DR_ENTITY_UNUSABLE 2
309 #define ALLOCATION_STATE 9003
310 #define ALLOC_UNUSABLE 0
311 #define ALLOC_USABLE 1
312 #define ISOLATION_STATE 9001
316 int dlpar_acquire_drc(u32 drc_index
)
320 rc
= rtas_call(rtas_token("get-sensor-state"), 2, 2, &dr_status
,
321 DR_ENTITY_SENSE
, drc_index
);
322 if (rc
|| dr_status
!= DR_ENTITY_UNUSABLE
)
325 rc
= rtas_set_indicator(ALLOCATION_STATE
, drc_index
, ALLOC_USABLE
);
329 rc
= rtas_set_indicator(ISOLATION_STATE
, drc_index
, UNISOLATE
);
331 rtas_set_indicator(ALLOCATION_STATE
, drc_index
, ALLOC_UNUSABLE
);
338 int dlpar_release_drc(u32 drc_index
)
342 rc
= rtas_call(rtas_token("get-sensor-state"), 2, 2, &dr_status
,
343 DR_ENTITY_SENSE
, drc_index
);
344 if (rc
|| dr_status
!= DR_ENTITY_PRESENT
)
347 rc
= rtas_set_indicator(ISOLATION_STATE
, drc_index
, ISOLATE
);
351 rc
= rtas_set_indicator(ALLOCATION_STATE
, drc_index
, ALLOC_UNUSABLE
);
353 rtas_set_indicator(ISOLATION_STATE
, drc_index
, UNISOLATE
);
360 #ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
362 static int dlpar_online_cpu(struct device_node
*dn
)
366 int len
, nthreads
, i
;
367 const __be32
*intserv
;
370 intserv
= of_get_property(dn
, "ibm,ppc-interrupt-server#s", &len
);
374 nthreads
= len
/ sizeof(u32
);
376 cpu_maps_update_begin();
377 for (i
= 0; i
< nthreads
; i
++) {
378 thread
= be32_to_cpu(intserv
[i
]);
379 for_each_present_cpu(cpu
) {
380 if (get_hard_smp_processor_id(cpu
) != thread
)
382 BUG_ON(get_cpu_current_state(cpu
)
383 != CPU_STATE_OFFLINE
);
384 cpu_maps_update_done();
385 rc
= device_online(get_cpu_device(cpu
));
388 cpu_maps_update_begin();
392 if (cpu
== num_possible_cpus())
393 printk(KERN_WARNING
"Could not find cpu to online "
394 "with physical id 0x%x\n", thread
);
396 cpu_maps_update_done();
403 static ssize_t
dlpar_cpu_probe(const char *buf
, size_t count
)
405 struct device_node
*dn
, *parent
;
409 rc
= kstrtou32(buf
, 0, &drc_index
);
413 parent
= of_find_node_by_path("/cpus");
417 dn
= dlpar_configure_connector(cpu_to_be32(drc_index
), parent
);
423 rc
= dlpar_acquire_drc(drc_index
);
425 dlpar_free_cc_nodes(dn
);
429 rc
= dlpar_attach_node(dn
);
431 dlpar_release_drc(drc_index
);
432 dlpar_free_cc_nodes(dn
);
436 rc
= dlpar_online_cpu(dn
);
443 static int dlpar_offline_cpu(struct device_node
*dn
)
447 int len
, nthreads
, i
;
448 const __be32
*intserv
;
451 intserv
= of_get_property(dn
, "ibm,ppc-interrupt-server#s", &len
);
455 nthreads
= len
/ sizeof(u32
);
457 cpu_maps_update_begin();
458 for (i
= 0; i
< nthreads
; i
++) {
459 thread
= be32_to_cpu(intserv
[i
]);
460 for_each_present_cpu(cpu
) {
461 if (get_hard_smp_processor_id(cpu
) != thread
)
464 if (get_cpu_current_state(cpu
) == CPU_STATE_OFFLINE
)
467 if (get_cpu_current_state(cpu
) == CPU_STATE_ONLINE
) {
468 set_preferred_offline_state(cpu
, CPU_STATE_OFFLINE
);
469 cpu_maps_update_done();
470 rc
= device_offline(get_cpu_device(cpu
));
473 cpu_maps_update_begin();
479 * The cpu is in CPU_STATE_INACTIVE.
480 * Upgrade it's state to CPU_STATE_OFFLINE.
482 set_preferred_offline_state(cpu
, CPU_STATE_OFFLINE
);
483 BUG_ON(plpar_hcall_norets(H_PROD
, thread
)
488 if (cpu
== num_possible_cpus())
489 printk(KERN_WARNING
"Could not find cpu to offline "
490 "with physical id 0x%x\n", thread
);
492 cpu_maps_update_done();
499 static ssize_t
dlpar_cpu_release(const char *buf
, size_t count
)
501 struct device_node
*dn
;
505 dn
= of_find_node_by_path(buf
);
509 rc
= of_property_read_u32(dn
, "ibm,my-drc-index", &drc_index
);
515 rc
= dlpar_offline_cpu(dn
);
521 rc
= dlpar_release_drc(drc_index
);
527 rc
= dlpar_detach_node(dn
);
529 dlpar_acquire_drc(drc_index
);
538 static int __init
pseries_dlpar_init(void)
540 ppc_md
.cpu_probe
= dlpar_cpu_probe
;
541 ppc_md
.cpu_release
= dlpar_cpu_release
;
545 machine_device_initcall(pseries
, pseries_dlpar_init
);
547 #endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */