2 * pseries Memory Hotplug infrastructure.
4 * Copyright (C) 2008 Badari Pulavarty, IBM Corporation
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
13 #include <linux/of_address.h>
14 #include <linux/memblock.h>
15 #include <linux/vmalloc.h>
16 #include <linux/memory.h>
17 #include <linux/memory_hotplug.h>
19 #include <asm/firmware.h>
20 #include <asm/machdep.h>
22 #include <asm/sparsemem.h>
24 unsigned long pseries_memory_block_size(void)
26 struct device_node
*np
;
27 unsigned int memblock_size
= MIN_MEMORY_BLOCK_SIZE
;
30 np
= of_find_node_by_path("/ibm,dynamic-reconfiguration-memory");
34 size
= of_get_property(np
, "ibm,lmb-size", NULL
);
36 memblock_size
= be64_to_cpup(size
);
38 } else if (machine_is(pseries
)) {
39 /* This fallback really only applies to pseries */
40 unsigned int memzero_size
= 0;
42 np
= of_find_node_by_path("/memory@0");
44 if (!of_address_to_resource(np
, 0, &r
))
45 memzero_size
= resource_size(&r
);
50 /* We now know the size of memory@0, use this to find
51 * the first memoryblock and get its size.
55 sprintf(buf
, "/memory@%x", memzero_size
);
56 np
= of_find_node_by_path(buf
);
58 if (!of_address_to_resource(np
, 0, &r
))
59 memblock_size
= resource_size(&r
);
67 #ifdef CONFIG_MEMORY_HOTREMOVE
68 static int pseries_remove_memory(u64 start
, u64 size
)
72 /* Remove htab bolted mappings for this section of memory */
73 start
= (unsigned long)__va(start
);
74 ret
= remove_section_mapping(start
, start
+ size
);
76 /* Ensure all vmalloc mappings are flushed in case they also
77 * hit that section of memory
84 static int pseries_remove_memblock(unsigned long base
, unsigned int memblock_size
)
86 unsigned long block_sz
, start_pfn
;
87 int sections_per_block
;
90 start_pfn
= base
>> PAGE_SHIFT
;
92 lock_device_hotplug();
94 if (!pfn_valid(start_pfn
))
97 block_sz
= pseries_memory_block_size();
98 sections_per_block
= block_sz
/ MIN_MEMORY_BLOCK_SIZE
;
99 nid
= memory_add_physaddr_to_nid(base
);
101 for (i
= 0; i
< sections_per_block
; i
++) {
102 remove_memory(nid
, base
, MIN_MEMORY_BLOCK_SIZE
);
103 base
+= MIN_MEMORY_BLOCK_SIZE
;
107 /* Update memory regions for memory remove */
108 memblock_remove(base
, memblock_size
);
109 unlock_device_hotplug();
113 static int pseries_remove_mem_node(struct device_node
*np
)
116 const unsigned int *regs
;
118 unsigned int lmb_size
;
122 * Check to see if we are actually removing memory
124 type
= of_get_property(np
, "device_type", NULL
);
125 if (type
== NULL
|| strcmp(type
, "memory") != 0)
129 * Find the bae address and size of the memblock
131 regs
= of_get_property(np
, "reg", NULL
);
135 base
= *(unsigned long *)regs
;
138 pseries_remove_memblock(base
, lmb_size
);
142 static inline int pseries_remove_memblock(unsigned long base
,
143 unsigned int memblock_size
)
147 static inline int pseries_remove_mem_node(struct device_node
*np
)
151 #endif /* CONFIG_MEMORY_HOTREMOVE */
153 static int pseries_add_mem_node(struct device_node
*np
)
156 const unsigned int *regs
;
158 unsigned int lmb_size
;
162 * Check to see if we are actually adding memory
164 type
= of_get_property(np
, "device_type", NULL
);
165 if (type
== NULL
|| strcmp(type
, "memory") != 0)
169 * Find the base and size of the memblock
171 regs
= of_get_property(np
, "reg", NULL
);
175 base
= *(unsigned long *)regs
;
179 * Update memory region to represent the memory add
181 ret
= memblock_add(base
, lmb_size
);
182 return (ret
< 0) ? -EINVAL
: 0;
185 static int pseries_update_drconf_memory(struct of_prop_reconfig
*pr
)
187 struct of_drconf_cell
*new_drmem
, *old_drmem
;
188 unsigned long memblock_size
;
193 memblock_size
= pseries_memory_block_size();
197 p
= (u32
*) pr
->old_prop
->value
;
201 /* The first int of the property is the number of lmb's described
202 * by the property. This is followed by an array of of_drconf_cell
203 * entries. Get the niumber of entries and skip to the array of
207 old_drmem
= (struct of_drconf_cell
*)p
;
209 p
= (u32
*)pr
->prop
->value
;
211 new_drmem
= (struct of_drconf_cell
*)p
;
213 for (i
= 0; i
< entries
; i
++) {
214 if ((old_drmem
[i
].flags
& DRCONF_MEM_ASSIGNED
) &&
215 (!(new_drmem
[i
].flags
& DRCONF_MEM_ASSIGNED
))) {
216 rc
= pseries_remove_memblock(old_drmem
[i
].base_addr
,
219 } else if ((!(old_drmem
[i
].flags
& DRCONF_MEM_ASSIGNED
)) &&
220 (new_drmem
[i
].flags
& DRCONF_MEM_ASSIGNED
)) {
221 rc
= memblock_add(old_drmem
[i
].base_addr
,
223 rc
= (rc
< 0) ? -EINVAL
: 0;
231 static int pseries_memory_notifier(struct notifier_block
*nb
,
232 unsigned long action
, void *node
)
234 struct of_prop_reconfig
*pr
;
238 case OF_RECONFIG_ATTACH_NODE
:
239 err
= pseries_add_mem_node(node
);
241 case OF_RECONFIG_DETACH_NODE
:
242 err
= pseries_remove_mem_node(node
);
244 case OF_RECONFIG_UPDATE_PROPERTY
:
245 pr
= (struct of_prop_reconfig
*)node
;
246 if (!strcmp(pr
->prop
->name
, "ibm,dynamic-memory"))
247 err
= pseries_update_drconf_memory(pr
);
250 return notifier_from_errno(err
);
253 static struct notifier_block pseries_mem_nb
= {
254 .notifier_call
= pseries_memory_notifier
,
257 static int __init
pseries_memory_hotplug_init(void)
259 if (firmware_has_feature(FW_FEATURE_LPAR
))
260 of_reconfig_notifier_register(&pseries_mem_nb
);
262 #ifdef CONFIG_MEMORY_HOTREMOVE
263 ppc_md
.remove_memory
= pseries_remove_memory
;
268 machine_device_initcall(pseries
, pseries_memory_hotplug_init
);