Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 1 | /* |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 2 | * Memory subsystem support |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 3 | * |
| 4 | * Written by Matt Tolentino <matthew.e.tolentino@intel.com> |
| 5 | * Dave Hansen <haveblue@us.ibm.com> |
| 6 | * |
| 7 | * This file provides the necessary infrastructure to represent |
| 8 | * a SPARSEMEM-memory-model system's physical memory in /sysfs. |
| 9 | * All arch-independent code that assumes MEMORY_HOTPLUG requires |
| 10 | * SPARSEMEM should be contained here, or in mm/memory_hotplug.c. |
| 11 | */ |
| 12 | |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 13 | #include <linux/module.h> |
| 14 | #include <linux/init.h> |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 15 | #include <linux/topology.h> |
Randy.Dunlap | c59ede7 | 2006-01-11 12:17:46 -0800 | [diff] [blame] | 16 | #include <linux/capability.h> |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 17 | #include <linux/device.h> |
| 18 | #include <linux/memory.h> |
| 19 | #include <linux/kobject.h> |
| 20 | #include <linux/memory_hotplug.h> |
| 21 | #include <linux/mm.h> |
Daniel Walker | da19cbc | 2008-02-04 23:35:47 -0800 | [diff] [blame] | 22 | #include <linux/mutex.h> |
Shaohua Li | 9f1b16a | 2008-10-18 20:27:12 -0700 | [diff] [blame] | 23 | #include <linux/stat.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 24 | #include <linux/slab.h> |
Shaohua Li | 9f1b16a | 2008-10-18 20:27:12 -0700 | [diff] [blame] | 25 | |
Arun Sharma | 60063497 | 2011-07-26 16:09:06 -0700 | [diff] [blame] | 26 | #include <linux/atomic.h> |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 27 | #include <asm/uaccess.h> |
| 28 | |
Nathan Fontenot | 2938ffb | 2010-10-19 12:45:24 -0500 | [diff] [blame] | 29 | static DEFINE_MUTEX(mem_sysfs_mutex); |
| 30 | |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 31 | #define MEMORY_CLASS_NAME "memory" |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 32 | |
| 33 | static int sections_per_block; |
| 34 | |
| 35 | static inline int base_memory_block_id(int section_nr) |
| 36 | { |
| 37 | return section_nr / sections_per_block; |
| 38 | } |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 39 | |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 40 | static struct bus_type memory_subsys = { |
Kay Sievers | af5ca3f | 2007-12-20 02:09:39 +0100 | [diff] [blame] | 41 | .name = MEMORY_CLASS_NAME, |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 42 | .dev_name = MEMORY_CLASS_NAME, |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 43 | }; |
| 44 | |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 45 | static BLOCKING_NOTIFIER_HEAD(memory_chain); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 46 | |
Andy Whitcroft | 98a38eb | 2006-01-06 00:10:35 -0800 | [diff] [blame] | 47 | int register_memory_notifier(struct notifier_block *nb) |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 48 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 49 | return blocking_notifier_chain_register(&memory_chain, nb); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 50 | } |
Hannes Hering | 3c82c30 | 2008-05-07 14:43:01 +0200 | [diff] [blame] | 51 | EXPORT_SYMBOL(register_memory_notifier); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 52 | |
Andy Whitcroft | 98a38eb | 2006-01-06 00:10:35 -0800 | [diff] [blame] | 53 | void unregister_memory_notifier(struct notifier_block *nb) |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 54 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 55 | blocking_notifier_chain_unregister(&memory_chain, nb); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 56 | } |
Hannes Hering | 3c82c30 | 2008-05-07 14:43:01 +0200 | [diff] [blame] | 57 | EXPORT_SYMBOL(unregister_memory_notifier); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 58 | |
Robert Jennings | 925cc71 | 2009-12-17 14:44:38 +0000 | [diff] [blame] | 59 | static ATOMIC_NOTIFIER_HEAD(memory_isolate_chain); |
| 60 | |
| 61 | int register_memory_isolate_notifier(struct notifier_block *nb) |
| 62 | { |
| 63 | return atomic_notifier_chain_register(&memory_isolate_chain, nb); |
| 64 | } |
| 65 | EXPORT_SYMBOL(register_memory_isolate_notifier); |
| 66 | |
| 67 | void unregister_memory_isolate_notifier(struct notifier_block *nb) |
| 68 | { |
| 69 | atomic_notifier_chain_unregister(&memory_isolate_chain, nb); |
| 70 | } |
| 71 | EXPORT_SYMBOL(unregister_memory_isolate_notifier); |
| 72 | |
Yasuaki Ishimatsu | fa7194e | 2012-12-11 16:00:44 -0800 | [diff] [blame] | 73 | static void memory_block_release(struct device *dev) |
| 74 | { |
| 75 | struct memory_block *mem = container_of(dev, struct memory_block, dev); |
| 76 | |
| 77 | kfree(mem); |
| 78 | } |
| 79 | |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 80 | /* |
| 81 | * register_memory - Setup a sysfs device for a memory block |
| 82 | */ |
Badari Pulavarty | 00a41db | 2008-02-11 09:23:18 -0800 | [diff] [blame] | 83 | static |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 84 | int register_memory(struct memory_block *memory) |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 85 | { |
| 86 | int error; |
| 87 | |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 88 | memory->dev.bus = &memory_subsys; |
| 89 | memory->dev.id = memory->start_section_nr / sections_per_block; |
Yasuaki Ishimatsu | fa7194e | 2012-12-11 16:00:44 -0800 | [diff] [blame] | 90 | memory->dev.release = memory_block_release; |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 91 | |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 92 | error = device_register(&memory->dev); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 93 | return error; |
| 94 | } |
| 95 | |
| 96 | static void |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 97 | unregister_memory(struct memory_block *memory) |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 98 | { |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 99 | BUG_ON(memory->dev.bus != &memory_subsys); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 100 | |
Badari Pulavarty | 00a41db | 2008-02-11 09:23:18 -0800 | [diff] [blame] | 101 | /* drop the ref. we got in remove_memory_block() */ |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 102 | kobject_put(&memory->dev.kobj); |
| 103 | device_unregister(&memory->dev); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 104 | } |
| 105 | |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 106 | unsigned long __weak memory_block_size_bytes(void) |
| 107 | { |
| 108 | return MIN_MEMORY_BLOCK_SIZE; |
| 109 | } |
| 110 | |
| 111 | static unsigned long get_memory_block_size(void) |
| 112 | { |
| 113 | unsigned long block_sz; |
| 114 | |
| 115 | block_sz = memory_block_size_bytes(); |
| 116 | |
| 117 | /* Validate blk_sz is a power of 2 and not less than section size */ |
| 118 | if ((block_sz & (block_sz - 1)) || (block_sz < MIN_MEMORY_BLOCK_SIZE)) { |
| 119 | WARN_ON(1); |
| 120 | block_sz = MIN_MEMORY_BLOCK_SIZE; |
| 121 | } |
| 122 | |
| 123 | return block_sz; |
| 124 | } |
| 125 | |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 126 | /* |
| 127 | * use this as the physical section index that this memsection |
| 128 | * uses. |
| 129 | */ |
| 130 | |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 131 | static ssize_t show_mem_start_phys_index(struct device *dev, |
| 132 | struct device_attribute *attr, char *buf) |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 133 | { |
| 134 | struct memory_block *mem = |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 135 | container_of(dev, struct memory_block, dev); |
Nathan Fontenot | d336016 | 2011-01-20 10:44:29 -0600 | [diff] [blame] | 136 | unsigned long phys_index; |
| 137 | |
| 138 | phys_index = mem->start_section_nr / sections_per_block; |
| 139 | return sprintf(buf, "%08lx\n", phys_index); |
| 140 | } |
| 141 | |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 142 | static ssize_t show_mem_end_phys_index(struct device *dev, |
| 143 | struct device_attribute *attr, char *buf) |
Nathan Fontenot | d336016 | 2011-01-20 10:44:29 -0600 | [diff] [blame] | 144 | { |
| 145 | struct memory_block *mem = |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 146 | container_of(dev, struct memory_block, dev); |
Nathan Fontenot | d336016 | 2011-01-20 10:44:29 -0600 | [diff] [blame] | 147 | unsigned long phys_index; |
| 148 | |
| 149 | phys_index = mem->end_section_nr / sections_per_block; |
| 150 | return sprintf(buf, "%08lx\n", phys_index); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 151 | } |
| 152 | |
| 153 | /* |
Badari Pulavarty | 5c755e9 | 2008-07-23 21:28:19 -0700 | [diff] [blame] | 154 | * Show whether the section of memory is likely to be hot-removable |
| 155 | */ |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 156 | static ssize_t show_mem_removable(struct device *dev, |
| 157 | struct device_attribute *attr, char *buf) |
Badari Pulavarty | 5c755e9 | 2008-07-23 21:28:19 -0700 | [diff] [blame] | 158 | { |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 159 | unsigned long i, pfn; |
| 160 | int ret = 1; |
Badari Pulavarty | 5c755e9 | 2008-07-23 21:28:19 -0700 | [diff] [blame] | 161 | struct memory_block *mem = |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 162 | container_of(dev, struct memory_block, dev); |
Badari Pulavarty | 5c755e9 | 2008-07-23 21:28:19 -0700 | [diff] [blame] | 163 | |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 164 | for (i = 0; i < sections_per_block; i++) { |
Nathan Fontenot | d336016 | 2011-01-20 10:44:29 -0600 | [diff] [blame] | 165 | pfn = section_nr_to_pfn(mem->start_section_nr + i); |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 166 | ret &= is_mem_section_removable(pfn, PAGES_PER_SECTION); |
| 167 | } |
| 168 | |
Badari Pulavarty | 5c755e9 | 2008-07-23 21:28:19 -0700 | [diff] [blame] | 169 | return sprintf(buf, "%d\n", ret); |
| 170 | } |
| 171 | |
| 172 | /* |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 173 | * online, offline, going offline, etc. |
| 174 | */ |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 175 | static ssize_t show_mem_state(struct device *dev, |
| 176 | struct device_attribute *attr, char *buf) |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 177 | { |
| 178 | struct memory_block *mem = |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 179 | container_of(dev, struct memory_block, dev); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 180 | ssize_t len = 0; |
| 181 | |
| 182 | /* |
| 183 | * We can probably put these states in a nice little array |
| 184 | * so that they're not open-coded |
| 185 | */ |
| 186 | switch (mem->state) { |
| 187 | case MEM_ONLINE: |
| 188 | len = sprintf(buf, "online\n"); |
| 189 | break; |
| 190 | case MEM_OFFLINE: |
| 191 | len = sprintf(buf, "offline\n"); |
| 192 | break; |
| 193 | case MEM_GOING_OFFLINE: |
| 194 | len = sprintf(buf, "going-offline\n"); |
| 195 | break; |
| 196 | default: |
| 197 | len = sprintf(buf, "ERROR-UNKNOWN-%ld\n", |
| 198 | mem->state); |
| 199 | WARN_ON(1); |
| 200 | break; |
| 201 | } |
| 202 | |
| 203 | return len; |
| 204 | } |
| 205 | |
Yasunori Goto | 7b78d33 | 2007-10-21 16:41:36 -0700 | [diff] [blame] | 206 | int memory_notify(unsigned long val, void *v) |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 207 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 208 | return blocking_notifier_call_chain(&memory_chain, val, v); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 209 | } |
| 210 | |
Robert Jennings | 925cc71 | 2009-12-17 14:44:38 +0000 | [diff] [blame] | 211 | int memory_isolate_notify(unsigned long val, void *v) |
| 212 | { |
| 213 | return atomic_notifier_call_chain(&memory_isolate_chain, val, v); |
| 214 | } |
| 215 | |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 216 | /* |
Mel Gorman | 2bbcb878 | 2011-10-17 16:38:20 +0200 | [diff] [blame] | 217 | * The probe routines leave the pages reserved, just as the bootmem code does. |
| 218 | * Make sure they're still that way. |
| 219 | */ |
| 220 | static bool pages_correctly_reserved(unsigned long start_pfn, |
| 221 | unsigned long nr_pages) |
| 222 | { |
| 223 | int i, j; |
| 224 | struct page *page; |
| 225 | unsigned long pfn = start_pfn; |
| 226 | |
| 227 | /* |
| 228 | * memmap between sections is not contiguous except with |
| 229 | * SPARSEMEM_VMEMMAP. We lookup the page once per section |
| 230 | * and assume memmap is contiguous within each section |
| 231 | */ |
| 232 | for (i = 0; i < sections_per_block; i++, pfn += PAGES_PER_SECTION) { |
| 233 | if (WARN_ON_ONCE(!pfn_valid(pfn))) |
| 234 | return false; |
| 235 | page = pfn_to_page(pfn); |
| 236 | |
| 237 | for (j = 0; j < PAGES_PER_SECTION; j++) { |
| 238 | if (PageReserved(page + j)) |
| 239 | continue; |
| 240 | |
| 241 | printk(KERN_WARNING "section number %ld page number %d " |
| 242 | "not reserved, was it already online?\n", |
| 243 | pfn_to_section_nr(pfn), j); |
| 244 | |
| 245 | return false; |
| 246 | } |
| 247 | } |
| 248 | |
| 249 | return true; |
| 250 | } |
| 251 | |
| 252 | /* |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 253 | * MEMORY_HOTPLUG depends on SPARSEMEM in mm/Kconfig, so it is |
| 254 | * OK to have direct references to sparsemem variables in here. |
| 255 | */ |
| 256 | static int |
Lai Jiangshan | 511c2ab | 2012-12-11 16:03:16 -0800 | [diff] [blame] | 257 | memory_block_action(unsigned long phys_index, unsigned long action, int online_type) |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 258 | { |
Wen Congyang | a16cee1 | 2012-10-08 16:33:58 -0700 | [diff] [blame] | 259 | unsigned long start_pfn; |
Anton Blanchard | 5409d2c | 2011-05-11 17:25:14 +1000 | [diff] [blame] | 260 | unsigned long nr_pages = PAGES_PER_SECTION * sections_per_block; |
Greg Kroah-Hartman | de0ed36 | 2011-10-18 14:00:57 -0700 | [diff] [blame] | 261 | struct page *first_page; |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 262 | int ret; |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 263 | |
Greg Kroah-Hartman | de0ed36 | 2011-10-18 14:00:57 -0700 | [diff] [blame] | 264 | first_page = pfn_to_page(phys_index << PFN_SECTION_SHIFT); |
Wen Congyang | a16cee1 | 2012-10-08 16:33:58 -0700 | [diff] [blame] | 265 | start_pfn = page_to_pfn(first_page); |
Greg Kroah-Hartman | de0ed36 | 2011-10-18 14:00:57 -0700 | [diff] [blame] | 266 | |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 267 | switch (action) { |
| 268 | case MEM_ONLINE: |
Mel Gorman | 2bbcb878 | 2011-10-17 16:38:20 +0200 | [diff] [blame] | 269 | if (!pages_correctly_reserved(start_pfn, nr_pages)) |
| 270 | return -EBUSY; |
| 271 | |
Lai Jiangshan | 511c2ab | 2012-12-11 16:03:16 -0800 | [diff] [blame] | 272 | ret = online_pages(start_pfn, nr_pages, online_type); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 273 | break; |
| 274 | case MEM_OFFLINE: |
Wen Congyang | a16cee1 | 2012-10-08 16:33:58 -0700 | [diff] [blame] | 275 | ret = offline_pages(start_pfn, nr_pages); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 276 | break; |
| 277 | default: |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 278 | WARN(1, KERN_WARNING "%s(%ld, %ld) unknown action: " |
| 279 | "%ld\n", __func__, phys_index, action, action); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 280 | ret = -EINVAL; |
| 281 | } |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 282 | |
| 283 | return ret; |
| 284 | } |
| 285 | |
Wen Congyang | e90bdb7 | 2012-10-08 16:34:01 -0700 | [diff] [blame] | 286 | static int __memory_block_change_state(struct memory_block *mem, |
Lai Jiangshan | 511c2ab | 2012-12-11 16:03:16 -0800 | [diff] [blame] | 287 | unsigned long to_state, unsigned long from_state_req, |
| 288 | int online_type) |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 289 | { |
Greg Kroah-Hartman | de0ed36 | 2011-10-18 14:00:57 -0700 | [diff] [blame] | 290 | int ret = 0; |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 291 | |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 292 | if (mem->state != from_state_req) { |
| 293 | ret = -EINVAL; |
| 294 | goto out; |
| 295 | } |
| 296 | |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 297 | if (to_state == MEM_OFFLINE) |
| 298 | mem->state = MEM_GOING_OFFLINE; |
| 299 | |
Lai Jiangshan | 511c2ab | 2012-12-11 16:03:16 -0800 | [diff] [blame] | 300 | ret = memory_block_action(mem->start_section_nr, to_state, online_type); |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 301 | |
Michael Holzheu | f5138e4 | 2012-01-12 17:20:23 -0800 | [diff] [blame] | 302 | if (ret) { |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 303 | mem->state = from_state_req; |
Michael Holzheu | f5138e4 | 2012-01-12 17:20:23 -0800 | [diff] [blame] | 304 | goto out; |
| 305 | } |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 306 | |
Michael Holzheu | f5138e4 | 2012-01-12 17:20:23 -0800 | [diff] [blame] | 307 | mem->state = to_state; |
| 308 | switch (mem->state) { |
| 309 | case MEM_OFFLINE: |
| 310 | kobject_uevent(&mem->dev.kobj, KOBJ_OFFLINE); |
| 311 | break; |
| 312 | case MEM_ONLINE: |
| 313 | kobject_uevent(&mem->dev.kobj, KOBJ_ONLINE); |
| 314 | break; |
| 315 | default: |
| 316 | break; |
| 317 | } |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 318 | out: |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 319 | return ret; |
| 320 | } |
| 321 | |
Wen Congyang | e90bdb7 | 2012-10-08 16:34:01 -0700 | [diff] [blame] | 322 | static int memory_block_change_state(struct memory_block *mem, |
Lai Jiangshan | 511c2ab | 2012-12-11 16:03:16 -0800 | [diff] [blame] | 323 | unsigned long to_state, unsigned long from_state_req, |
| 324 | int online_type) |
Wen Congyang | e90bdb7 | 2012-10-08 16:34:01 -0700 | [diff] [blame] | 325 | { |
| 326 | int ret; |
| 327 | |
| 328 | mutex_lock(&mem->state_mutex); |
Lai Jiangshan | 511c2ab | 2012-12-11 16:03:16 -0800 | [diff] [blame] | 329 | ret = __memory_block_change_state(mem, to_state, from_state_req, |
| 330 | online_type); |
Wen Congyang | e90bdb7 | 2012-10-08 16:34:01 -0700 | [diff] [blame] | 331 | mutex_unlock(&mem->state_mutex); |
| 332 | |
| 333 | return ret; |
| 334 | } |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 335 | static ssize_t |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 336 | store_mem_state(struct device *dev, |
| 337 | struct device_attribute *attr, const char *buf, size_t count) |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 338 | { |
| 339 | struct memory_block *mem; |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 340 | int ret = -EINVAL; |
| 341 | |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 342 | mem = container_of(dev, struct memory_block, dev); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 343 | |
Lai Jiangshan | 511c2ab | 2012-12-11 16:03:16 -0800 | [diff] [blame] | 344 | if (!strncmp(buf, "online_kernel", min_t(int, count, 13))) |
| 345 | ret = memory_block_change_state(mem, MEM_ONLINE, |
| 346 | MEM_OFFLINE, ONLINE_KERNEL); |
| 347 | else if (!strncmp(buf, "online_movable", min_t(int, count, 14))) |
| 348 | ret = memory_block_change_state(mem, MEM_ONLINE, |
| 349 | MEM_OFFLINE, ONLINE_MOVABLE); |
| 350 | else if (!strncmp(buf, "online", min_t(int, count, 6))) |
| 351 | ret = memory_block_change_state(mem, MEM_ONLINE, |
| 352 | MEM_OFFLINE, ONLINE_KEEP); |
| 353 | else if(!strncmp(buf, "offline", min_t(int, count, 7))) |
| 354 | ret = memory_block_change_state(mem, MEM_OFFLINE, |
| 355 | MEM_ONLINE, -1); |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 356 | |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 357 | if (ret) |
| 358 | return ret; |
| 359 | return count; |
| 360 | } |
| 361 | |
| 362 | /* |
| 363 | * phys_device is a bad name for this. What I really want |
| 364 | * is a way to differentiate between memory ranges that |
| 365 | * are part of physical devices that constitute |
| 366 | * a complete removable unit or fru. |
| 367 | * i.e. do these ranges belong to the same physical device, |
| 368 | * s.t. if I offline all of these sections I can then |
| 369 | * remove the physical device? |
| 370 | */ |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 371 | static ssize_t show_phys_device(struct device *dev, |
| 372 | struct device_attribute *attr, char *buf) |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 373 | { |
| 374 | struct memory_block *mem = |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 375 | container_of(dev, struct memory_block, dev); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 376 | return sprintf(buf, "%d\n", mem->phys_device); |
| 377 | } |
| 378 | |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 379 | static DEVICE_ATTR(phys_index, 0444, show_mem_start_phys_index, NULL); |
| 380 | static DEVICE_ATTR(end_phys_index, 0444, show_mem_end_phys_index, NULL); |
| 381 | static DEVICE_ATTR(state, 0644, show_mem_state, store_mem_state); |
| 382 | static DEVICE_ATTR(phys_device, 0444, show_phys_device, NULL); |
| 383 | static DEVICE_ATTR(removable, 0444, show_mem_removable, NULL); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 384 | |
| 385 | #define mem_create_simple_file(mem, attr_name) \ |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 386 | device_create_file(&mem->dev, &dev_attr_##attr_name) |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 387 | #define mem_remove_simple_file(mem, attr_name) \ |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 388 | device_remove_file(&mem->dev, &dev_attr_##attr_name) |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 389 | |
| 390 | /* |
| 391 | * Block size attribute stuff |
| 392 | */ |
| 393 | static ssize_t |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 394 | print_block_size(struct device *dev, struct device_attribute *attr, |
Andi Kleen | 8564a6c | 2010-01-05 12:48:06 +0100 | [diff] [blame] | 395 | char *buf) |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 396 | { |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 397 | return sprintf(buf, "%lx\n", get_memory_block_size()); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 398 | } |
| 399 | |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 400 | static DEVICE_ATTR(block_size_bytes, 0444, print_block_size, NULL); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 401 | |
| 402 | static int block_size_init(void) |
| 403 | { |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 404 | return device_create_file(memory_subsys.dev_root, |
| 405 | &dev_attr_block_size_bytes); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 406 | } |
| 407 | |
| 408 | /* |
| 409 | * Some architectures will have custom drivers to do this, and |
| 410 | * will not need to do it from userspace. The fake hot-add code |
| 411 | * as well as ppc64 will do all of their discovery in userspace |
| 412 | * and will require this interface. |
| 413 | */ |
| 414 | #ifdef CONFIG_ARCH_MEMORY_PROBE |
| 415 | static ssize_t |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 416 | memory_probe_store(struct device *dev, struct device_attribute *attr, |
Andi Kleen | 28812fe | 2010-01-05 12:48:07 +0100 | [diff] [blame] | 417 | const char *buf, size_t count) |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 418 | { |
| 419 | u64 phys_addr; |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 420 | int nid; |
Nathan Fontenot | 6add7cd | 2011-01-31 10:55:23 -0600 | [diff] [blame] | 421 | int i, ret; |
Anton Blanchard | 61b94fe | 2011-09-15 06:26:15 +1000 | [diff] [blame] | 422 | unsigned long pages_per_block = PAGES_PER_SECTION * sections_per_block; |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 423 | |
| 424 | phys_addr = simple_strtoull(buf, NULL, 0); |
| 425 | |
Anton Blanchard | 61b94fe | 2011-09-15 06:26:15 +1000 | [diff] [blame] | 426 | if (phys_addr & ((pages_per_block << PAGE_SHIFT) - 1)) |
| 427 | return -EINVAL; |
| 428 | |
Nathan Fontenot | 6add7cd | 2011-01-31 10:55:23 -0600 | [diff] [blame] | 429 | for (i = 0; i < sections_per_block; i++) { |
| 430 | nid = memory_add_physaddr_to_nid(phys_addr); |
| 431 | ret = add_memory(nid, phys_addr, |
| 432 | PAGES_PER_SECTION << PAGE_SHIFT); |
| 433 | if (ret) |
Nikanth Karthikesan | 9f0af69 | 2011-03-24 11:46:18 +0530 | [diff] [blame] | 434 | goto out; |
Nathan Fontenot | 6add7cd | 2011-01-31 10:55:23 -0600 | [diff] [blame] | 435 | |
| 436 | phys_addr += MIN_MEMORY_BLOCK_SIZE; |
| 437 | } |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 438 | |
Nikanth Karthikesan | 9f0af69 | 2011-03-24 11:46:18 +0530 | [diff] [blame] | 439 | ret = count; |
| 440 | out: |
| 441 | return ret; |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 442 | } |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 443 | static DEVICE_ATTR(probe, S_IWUSR, NULL, memory_probe_store); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 444 | |
| 445 | static int memory_probe_init(void) |
| 446 | { |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 447 | return device_create_file(memory_subsys.dev_root, &dev_attr_probe); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 448 | } |
| 449 | #else |
Andrew Morton | 28ec24e | 2006-12-06 20:37:29 -0800 | [diff] [blame] | 450 | static inline int memory_probe_init(void) |
| 451 | { |
| 452 | return 0; |
| 453 | } |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 454 | #endif |
| 455 | |
Andi Kleen | facb601 | 2009-12-16 12:20:00 +0100 | [diff] [blame] | 456 | #ifdef CONFIG_MEMORY_FAILURE |
| 457 | /* |
| 458 | * Support for offlining pages of memory |
| 459 | */ |
| 460 | |
| 461 | /* Soft offline a page */ |
| 462 | static ssize_t |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 463 | store_soft_offline_page(struct device *dev, |
| 464 | struct device_attribute *attr, |
Andi Kleen | 28812fe | 2010-01-05 12:48:07 +0100 | [diff] [blame] | 465 | const char *buf, size_t count) |
Andi Kleen | facb601 | 2009-12-16 12:20:00 +0100 | [diff] [blame] | 466 | { |
| 467 | int ret; |
| 468 | u64 pfn; |
| 469 | if (!capable(CAP_SYS_ADMIN)) |
| 470 | return -EPERM; |
| 471 | if (strict_strtoull(buf, 0, &pfn) < 0) |
| 472 | return -EINVAL; |
| 473 | pfn >>= PAGE_SHIFT; |
| 474 | if (!pfn_valid(pfn)) |
| 475 | return -ENXIO; |
| 476 | ret = soft_offline_page(pfn_to_page(pfn), 0); |
| 477 | return ret == 0 ? count : ret; |
| 478 | } |
| 479 | |
| 480 | /* Forcibly offline a page, including killing processes. */ |
| 481 | static ssize_t |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 482 | store_hard_offline_page(struct device *dev, |
| 483 | struct device_attribute *attr, |
Andi Kleen | 28812fe | 2010-01-05 12:48:07 +0100 | [diff] [blame] | 484 | const char *buf, size_t count) |
Andi Kleen | facb601 | 2009-12-16 12:20:00 +0100 | [diff] [blame] | 485 | { |
| 486 | int ret; |
| 487 | u64 pfn; |
| 488 | if (!capable(CAP_SYS_ADMIN)) |
| 489 | return -EPERM; |
| 490 | if (strict_strtoull(buf, 0, &pfn) < 0) |
| 491 | return -EINVAL; |
| 492 | pfn >>= PAGE_SHIFT; |
Tony Luck | cd42f4a | 2011-12-15 10:48:12 -0800 | [diff] [blame] | 493 | ret = memory_failure(pfn, 0, 0); |
Andi Kleen | facb601 | 2009-12-16 12:20:00 +0100 | [diff] [blame] | 494 | return ret ? ret : count; |
| 495 | } |
| 496 | |
Felipe Balbi | 74fef7a | 2013-02-18 21:09:03 +0200 | [diff] [blame] | 497 | static DEVICE_ATTR(soft_offline_page, S_IWUSR, NULL, store_soft_offline_page); |
| 498 | static DEVICE_ATTR(hard_offline_page, S_IWUSR, NULL, store_hard_offline_page); |
Andi Kleen | facb601 | 2009-12-16 12:20:00 +0100 | [diff] [blame] | 499 | |
| 500 | static __init int memory_fail_init(void) |
| 501 | { |
| 502 | int err; |
| 503 | |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 504 | err = device_create_file(memory_subsys.dev_root, |
| 505 | &dev_attr_soft_offline_page); |
Andi Kleen | facb601 | 2009-12-16 12:20:00 +0100 | [diff] [blame] | 506 | if (!err) |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 507 | err = device_create_file(memory_subsys.dev_root, |
| 508 | &dev_attr_hard_offline_page); |
Andi Kleen | facb601 | 2009-12-16 12:20:00 +0100 | [diff] [blame] | 509 | return err; |
| 510 | } |
| 511 | #else |
| 512 | static inline int memory_fail_init(void) |
| 513 | { |
| 514 | return 0; |
| 515 | } |
| 516 | #endif |
| 517 | |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 518 | /* |
| 519 | * Note that phys_device is optional. It is here to allow for |
| 520 | * differentiation between which *physical* devices each |
| 521 | * section belongs to... |
| 522 | */ |
Heiko Carstens | bc32df0 | 2010-03-15 00:35:03 -0400 | [diff] [blame] | 523 | int __weak arch_get_memory_phys_device(unsigned long start_pfn) |
| 524 | { |
| 525 | return 0; |
| 526 | } |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 527 | |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 528 | /* |
| 529 | * A reference for the returned object is held and the reference for the |
| 530 | * hinted object is released. |
| 531 | */ |
Robin Holt | 9838303 | 2010-09-29 14:00:55 -0500 | [diff] [blame] | 532 | struct memory_block *find_memory_block_hinted(struct mem_section *section, |
| 533 | struct memory_block *hint) |
| 534 | { |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 535 | int block_id = base_memory_block_id(__section_nr(section)); |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 536 | struct device *hintdev = hint ? &hint->dev : NULL; |
| 537 | struct device *dev; |
Robin Holt | 9838303 | 2010-09-29 14:00:55 -0500 | [diff] [blame] | 538 | |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 539 | dev = subsys_find_device_by_id(&memory_subsys, block_id, hintdev); |
| 540 | if (hint) |
| 541 | put_device(&hint->dev); |
| 542 | if (!dev) |
Robin Holt | 9838303 | 2010-09-29 14:00:55 -0500 | [diff] [blame] | 543 | return NULL; |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 544 | return container_of(dev, struct memory_block, dev); |
Robin Holt | 9838303 | 2010-09-29 14:00:55 -0500 | [diff] [blame] | 545 | } |
| 546 | |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 547 | /* |
| 548 | * For now, we have a linear search to go find the appropriate |
| 549 | * memory_block corresponding to a particular phys_index. If |
| 550 | * this gets to be a real problem, we can always use a radix |
| 551 | * tree or something here. |
| 552 | * |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 553 | * This could be made generic for all device subsystems. |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 554 | */ |
Gary Hade | c04fc58 | 2009-01-06 14:39:14 -0800 | [diff] [blame] | 555 | struct memory_block *find_memory_block(struct mem_section *section) |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 556 | { |
Robin Holt | 9838303 | 2010-09-29 14:00:55 -0500 | [diff] [blame] | 557 | return find_memory_block_hinted(section, NULL); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 558 | } |
| 559 | |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 560 | static int init_memory_block(struct memory_block **memory, |
| 561 | struct mem_section *section, unsigned long state) |
Nathan Fontenot | e4619c8 | 2010-10-19 12:44:20 -0500 | [diff] [blame] | 562 | { |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 563 | struct memory_block *mem; |
Nathan Fontenot | e4619c8 | 2010-10-19 12:44:20 -0500 | [diff] [blame] | 564 | unsigned long start_pfn; |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 565 | int scn_nr; |
Nathan Fontenot | e4619c8 | 2010-10-19 12:44:20 -0500 | [diff] [blame] | 566 | int ret = 0; |
| 567 | |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 568 | mem = kzalloc(sizeof(*mem), GFP_KERNEL); |
Nathan Fontenot | e4619c8 | 2010-10-19 12:44:20 -0500 | [diff] [blame] | 569 | if (!mem) |
| 570 | return -ENOMEM; |
| 571 | |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 572 | scn_nr = __section_nr(section); |
Nathan Fontenot | d336016 | 2011-01-20 10:44:29 -0600 | [diff] [blame] | 573 | mem->start_section_nr = |
| 574 | base_memory_block_id(scn_nr) * sections_per_block; |
| 575 | mem->end_section_nr = mem->start_section_nr + sections_per_block - 1; |
Nathan Fontenot | e4619c8 | 2010-10-19 12:44:20 -0500 | [diff] [blame] | 576 | mem->state = state; |
Nathan Fontenot | 0768121 | 2010-10-19 12:46:19 -0500 | [diff] [blame] | 577 | mem->section_count++; |
Nathan Fontenot | e4619c8 | 2010-10-19 12:44:20 -0500 | [diff] [blame] | 578 | mutex_init(&mem->state_mutex); |
Nathan Fontenot | d336016 | 2011-01-20 10:44:29 -0600 | [diff] [blame] | 579 | start_pfn = section_nr_to_pfn(mem->start_section_nr); |
Nathan Fontenot | e4619c8 | 2010-10-19 12:44:20 -0500 | [diff] [blame] | 580 | mem->phys_device = arch_get_memory_phys_device(start_pfn); |
| 581 | |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 582 | ret = register_memory(mem); |
Nathan Fontenot | e4619c8 | 2010-10-19 12:44:20 -0500 | [diff] [blame] | 583 | if (!ret) |
| 584 | ret = mem_create_simple_file(mem, phys_index); |
| 585 | if (!ret) |
Nathan Fontenot | d336016 | 2011-01-20 10:44:29 -0600 | [diff] [blame] | 586 | ret = mem_create_simple_file(mem, end_phys_index); |
| 587 | if (!ret) |
Nathan Fontenot | e4619c8 | 2010-10-19 12:44:20 -0500 | [diff] [blame] | 588 | ret = mem_create_simple_file(mem, state); |
| 589 | if (!ret) |
| 590 | ret = mem_create_simple_file(mem, phys_device); |
| 591 | if (!ret) |
| 592 | ret = mem_create_simple_file(mem, removable); |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 593 | |
| 594 | *memory = mem; |
| 595 | return ret; |
| 596 | } |
| 597 | |
| 598 | static int add_memory_section(int nid, struct mem_section *section, |
Yinghai Lu | 321bf4e | 2012-01-30 13:57:12 -0800 | [diff] [blame] | 599 | struct memory_block **mem_p, |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 600 | unsigned long state, enum mem_add_context context) |
| 601 | { |
Yinghai Lu | 321bf4e | 2012-01-30 13:57:12 -0800 | [diff] [blame] | 602 | struct memory_block *mem = NULL; |
| 603 | int scn_nr = __section_nr(section); |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 604 | int ret = 0; |
| 605 | |
| 606 | mutex_lock(&mem_sysfs_mutex); |
| 607 | |
Yinghai Lu | 321bf4e | 2012-01-30 13:57:12 -0800 | [diff] [blame] | 608 | if (context == BOOT) { |
| 609 | /* same memory block ? */ |
| 610 | if (mem_p && *mem_p) |
| 611 | if (scn_nr >= (*mem_p)->start_section_nr && |
| 612 | scn_nr <= (*mem_p)->end_section_nr) { |
| 613 | mem = *mem_p; |
| 614 | kobject_get(&mem->dev.kobj); |
| 615 | } |
| 616 | } else |
| 617 | mem = find_memory_block(section); |
| 618 | |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 619 | if (mem) { |
| 620 | mem->section_count++; |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 621 | kobject_put(&mem->dev.kobj); |
Yinghai Lu | 321bf4e | 2012-01-30 13:57:12 -0800 | [diff] [blame] | 622 | } else { |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 623 | ret = init_memory_block(&mem, section, state); |
Yinghai Lu | 321bf4e | 2012-01-30 13:57:12 -0800 | [diff] [blame] | 624 | /* store memory_block pointer for next loop */ |
| 625 | if (!ret && context == BOOT) |
| 626 | if (mem_p) |
| 627 | *mem_p = mem; |
| 628 | } |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 629 | |
Nathan Fontenot | e4619c8 | 2010-10-19 12:44:20 -0500 | [diff] [blame] | 630 | if (!ret) { |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 631 | if (context == HOTPLUG && |
| 632 | mem->section_count == sections_per_block) |
Nathan Fontenot | e4619c8 | 2010-10-19 12:44:20 -0500 | [diff] [blame] | 633 | ret = register_mem_sect_under_node(mem, nid); |
| 634 | } |
| 635 | |
Nathan Fontenot | 2938ffb | 2010-10-19 12:45:24 -0500 | [diff] [blame] | 636 | mutex_unlock(&mem_sysfs_mutex); |
Nathan Fontenot | e4619c8 | 2010-10-19 12:44:20 -0500 | [diff] [blame] | 637 | return ret; |
| 638 | } |
| 639 | |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 640 | int remove_memory_block(unsigned long node_id, struct mem_section *section, |
| 641 | int phys_device) |
| 642 | { |
| 643 | struct memory_block *mem; |
| 644 | |
Nathan Fontenot | 2938ffb | 2010-10-19 12:45:24 -0500 | [diff] [blame] | 645 | mutex_lock(&mem_sysfs_mutex); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 646 | mem = find_memory_block(section); |
Nathan Fontenot | d336016 | 2011-01-20 10:44:29 -0600 | [diff] [blame] | 647 | unregister_mem_sect_under_nodes(mem, __section_nr(section)); |
Nathan Fontenot | 0768121 | 2010-10-19 12:46:19 -0500 | [diff] [blame] | 648 | |
| 649 | mem->section_count--; |
| 650 | if (mem->section_count == 0) { |
Nathan Fontenot | 0768121 | 2010-10-19 12:46:19 -0500 | [diff] [blame] | 651 | mem_remove_simple_file(mem, phys_index); |
Nathan Fontenot | d336016 | 2011-01-20 10:44:29 -0600 | [diff] [blame] | 652 | mem_remove_simple_file(mem, end_phys_index); |
Nathan Fontenot | 0768121 | 2010-10-19 12:46:19 -0500 | [diff] [blame] | 653 | mem_remove_simple_file(mem, state); |
| 654 | mem_remove_simple_file(mem, phys_device); |
| 655 | mem_remove_simple_file(mem, removable); |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 656 | unregister_memory(mem); |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 657 | } else |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 658 | kobject_put(&mem->dev.kobj); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 659 | |
Nathan Fontenot | 2938ffb | 2010-10-19 12:45:24 -0500 | [diff] [blame] | 660 | mutex_unlock(&mem_sysfs_mutex); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 661 | return 0; |
| 662 | } |
| 663 | |
| 664 | /* |
| 665 | * need an interface for the VM to add new memory regions, |
| 666 | * but without onlining it. |
| 667 | */ |
Gary Hade | c04fc58 | 2009-01-06 14:39:14 -0800 | [diff] [blame] | 668 | int register_new_memory(int nid, struct mem_section *section) |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 669 | { |
Yinghai Lu | 321bf4e | 2012-01-30 13:57:12 -0800 | [diff] [blame] | 670 | return add_memory_section(nid, section, NULL, MEM_OFFLINE, HOTPLUG); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 671 | } |
| 672 | |
| 673 | int unregister_memory_section(struct mem_section *section) |
| 674 | { |
Andy Whitcroft | 540557b | 2007-10-16 01:24:11 -0700 | [diff] [blame] | 675 | if (!present_section(section)) |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 676 | return -EINVAL; |
| 677 | |
| 678 | return remove_memory_block(0, section, 0); |
| 679 | } |
| 680 | |
| 681 | /* |
Wen Congyang | e90bdb7 | 2012-10-08 16:34:01 -0700 | [diff] [blame] | 682 | * offline one memory block. If the memory block has been offlined, do nothing. |
| 683 | */ |
| 684 | int offline_memory_block(struct memory_block *mem) |
| 685 | { |
| 686 | int ret = 0; |
| 687 | |
| 688 | mutex_lock(&mem->state_mutex); |
| 689 | if (mem->state != MEM_OFFLINE) |
Lai Jiangshan | 511c2ab | 2012-12-11 16:03:16 -0800 | [diff] [blame] | 690 | ret = __memory_block_change_state(mem, MEM_OFFLINE, MEM_ONLINE, -1); |
Wen Congyang | e90bdb7 | 2012-10-08 16:34:01 -0700 | [diff] [blame] | 691 | mutex_unlock(&mem->state_mutex); |
| 692 | |
| 693 | return ret; |
| 694 | } |
| 695 | |
Yasuaki Ishimatsu | 6677e3e | 2013-02-22 16:32:52 -0800 | [diff] [blame] | 696 | /* return true if the memory block is offlined, otherwise, return false */ |
| 697 | bool is_memblock_offlined(struct memory_block *mem) |
| 698 | { |
| 699 | return mem->state == MEM_OFFLINE; |
| 700 | } |
| 701 | |
Wen Congyang | e90bdb7 | 2012-10-08 16:34:01 -0700 | [diff] [blame] | 702 | /* |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 703 | * Initialize the sysfs support for memory devices... |
| 704 | */ |
| 705 | int __init memory_dev_init(void) |
| 706 | { |
| 707 | unsigned int i; |
| 708 | int ret; |
Andrew Morton | 28ec24e | 2006-12-06 20:37:29 -0800 | [diff] [blame] | 709 | int err; |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 710 | unsigned long block_sz; |
Yinghai Lu | 321bf4e | 2012-01-30 13:57:12 -0800 | [diff] [blame] | 711 | struct memory_block *mem = NULL; |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 712 | |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 713 | ret = subsys_system_register(&memory_subsys, NULL); |
Andrew Morton | 28ec24e | 2006-12-06 20:37:29 -0800 | [diff] [blame] | 714 | if (ret) |
| 715 | goto out; |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 716 | |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 717 | block_sz = get_memory_block_size(); |
| 718 | sections_per_block = block_sz / MIN_MEMORY_BLOCK_SIZE; |
| 719 | |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 720 | /* |
| 721 | * Create entries for memory sections that were found |
| 722 | * during boot and have been initialized |
| 723 | */ |
| 724 | for (i = 0; i < NR_MEM_SECTIONS; i++) { |
Andy Whitcroft | 540557b | 2007-10-16 01:24:11 -0700 | [diff] [blame] | 725 | if (!present_section_nr(i)) |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 726 | continue; |
Yinghai Lu | 321bf4e | 2012-01-30 13:57:12 -0800 | [diff] [blame] | 727 | /* don't need to reuse memory_block if only one per block */ |
| 728 | err = add_memory_section(0, __nr_to_section(i), |
| 729 | (sections_per_block == 1) ? NULL : &mem, |
| 730 | MEM_ONLINE, |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 731 | BOOT); |
Andrew Morton | 28ec24e | 2006-12-06 20:37:29 -0800 | [diff] [blame] | 732 | if (!ret) |
| 733 | ret = err; |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 734 | } |
| 735 | |
Andrew Morton | 28ec24e | 2006-12-06 20:37:29 -0800 | [diff] [blame] | 736 | err = memory_probe_init(); |
| 737 | if (!ret) |
| 738 | ret = err; |
Andi Kleen | facb601 | 2009-12-16 12:20:00 +0100 | [diff] [blame] | 739 | err = memory_fail_init(); |
| 740 | if (!ret) |
| 741 | ret = err; |
Andrew Morton | 28ec24e | 2006-12-06 20:37:29 -0800 | [diff] [blame] | 742 | err = block_size_init(); |
| 743 | if (!ret) |
| 744 | ret = err; |
| 745 | out: |
| 746 | if (ret) |
Harvey Harrison | 2b3a302 | 2008-03-04 16:41:05 -0800 | [diff] [blame] | 747 | printk(KERN_ERR "%s() failed: %d\n", __func__, ret); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 748 | return ret; |
| 749 | } |