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 | |
Rafael J. Wysocki | 4960e05 | 2013-05-08 14:18:37 +0200 | [diff] [blame] | 40 | static int memory_subsys_online(struct device *dev); |
| 41 | static int memory_subsys_offline(struct device *dev); |
| 42 | |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 43 | static struct bus_type memory_subsys = { |
Kay Sievers | af5ca3f | 2007-12-20 02:09:39 +0100 | [diff] [blame] | 44 | .name = MEMORY_CLASS_NAME, |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 45 | .dev_name = MEMORY_CLASS_NAME, |
Rafael J. Wysocki | 4960e05 | 2013-05-08 14:18:37 +0200 | [diff] [blame] | 46 | .online = memory_subsys_online, |
| 47 | .offline = memory_subsys_offline, |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 48 | }; |
| 49 | |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 50 | static BLOCKING_NOTIFIER_HEAD(memory_chain); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 51 | |
Andy Whitcroft | 98a38eb | 2006-01-06 00:10:35 -0800 | [diff] [blame] | 52 | int register_memory_notifier(struct notifier_block *nb) |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 53 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 54 | return blocking_notifier_chain_register(&memory_chain, nb); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 55 | } |
Hannes Hering | 3c82c30 | 2008-05-07 14:43:01 +0200 | [diff] [blame] | 56 | EXPORT_SYMBOL(register_memory_notifier); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 57 | |
Andy Whitcroft | 98a38eb | 2006-01-06 00:10:35 -0800 | [diff] [blame] | 58 | void unregister_memory_notifier(struct notifier_block *nb) |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 59 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 60 | blocking_notifier_chain_unregister(&memory_chain, nb); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 61 | } |
Hannes Hering | 3c82c30 | 2008-05-07 14:43:01 +0200 | [diff] [blame] | 62 | EXPORT_SYMBOL(unregister_memory_notifier); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 63 | |
Robert Jennings | 925cc71 | 2009-12-17 14:44:38 +0000 | [diff] [blame] | 64 | static ATOMIC_NOTIFIER_HEAD(memory_isolate_chain); |
| 65 | |
| 66 | int register_memory_isolate_notifier(struct notifier_block *nb) |
| 67 | { |
| 68 | return atomic_notifier_chain_register(&memory_isolate_chain, nb); |
| 69 | } |
| 70 | EXPORT_SYMBOL(register_memory_isolate_notifier); |
| 71 | |
| 72 | void unregister_memory_isolate_notifier(struct notifier_block *nb) |
| 73 | { |
| 74 | atomic_notifier_chain_unregister(&memory_isolate_chain, nb); |
| 75 | } |
| 76 | EXPORT_SYMBOL(unregister_memory_isolate_notifier); |
| 77 | |
Yasuaki Ishimatsu | fa7194e | 2012-12-11 16:00:44 -0800 | [diff] [blame] | 78 | static void memory_block_release(struct device *dev) |
| 79 | { |
| 80 | struct memory_block *mem = container_of(dev, struct memory_block, dev); |
| 81 | |
| 82 | kfree(mem); |
| 83 | } |
| 84 | |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 85 | unsigned long __weak memory_block_size_bytes(void) |
| 86 | { |
| 87 | return MIN_MEMORY_BLOCK_SIZE; |
| 88 | } |
| 89 | |
| 90 | static unsigned long get_memory_block_size(void) |
| 91 | { |
| 92 | unsigned long block_sz; |
| 93 | |
| 94 | block_sz = memory_block_size_bytes(); |
| 95 | |
| 96 | /* Validate blk_sz is a power of 2 and not less than section size */ |
| 97 | if ((block_sz & (block_sz - 1)) || (block_sz < MIN_MEMORY_BLOCK_SIZE)) { |
| 98 | WARN_ON(1); |
| 99 | block_sz = MIN_MEMORY_BLOCK_SIZE; |
| 100 | } |
| 101 | |
| 102 | return block_sz; |
| 103 | } |
| 104 | |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 105 | /* |
| 106 | * use this as the physical section index that this memsection |
| 107 | * uses. |
| 108 | */ |
| 109 | |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 110 | static ssize_t show_mem_start_phys_index(struct device *dev, |
| 111 | struct device_attribute *attr, char *buf) |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 112 | { |
| 113 | struct memory_block *mem = |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 114 | container_of(dev, struct memory_block, dev); |
Nathan Fontenot | d336016 | 2011-01-20 10:44:29 -0600 | [diff] [blame] | 115 | unsigned long phys_index; |
| 116 | |
| 117 | phys_index = mem->start_section_nr / sections_per_block; |
| 118 | return sprintf(buf, "%08lx\n", phys_index); |
| 119 | } |
| 120 | |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 121 | static ssize_t show_mem_end_phys_index(struct device *dev, |
| 122 | struct device_attribute *attr, char *buf) |
Nathan Fontenot | d336016 | 2011-01-20 10:44:29 -0600 | [diff] [blame] | 123 | { |
| 124 | struct memory_block *mem = |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 125 | container_of(dev, struct memory_block, dev); |
Nathan Fontenot | d336016 | 2011-01-20 10:44:29 -0600 | [diff] [blame] | 126 | unsigned long phys_index; |
| 127 | |
| 128 | phys_index = mem->end_section_nr / sections_per_block; |
| 129 | return sprintf(buf, "%08lx\n", phys_index); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 130 | } |
| 131 | |
| 132 | /* |
Badari Pulavarty | 5c755e9 | 2008-07-23 21:28:19 -0700 | [diff] [blame] | 133 | * Show whether the section of memory is likely to be hot-removable |
| 134 | */ |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 135 | static ssize_t show_mem_removable(struct device *dev, |
| 136 | struct device_attribute *attr, char *buf) |
Badari Pulavarty | 5c755e9 | 2008-07-23 21:28:19 -0700 | [diff] [blame] | 137 | { |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 138 | unsigned long i, pfn; |
| 139 | int ret = 1; |
Badari Pulavarty | 5c755e9 | 2008-07-23 21:28:19 -0700 | [diff] [blame] | 140 | struct memory_block *mem = |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 141 | container_of(dev, struct memory_block, dev); |
Badari Pulavarty | 5c755e9 | 2008-07-23 21:28:19 -0700 | [diff] [blame] | 142 | |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 143 | for (i = 0; i < sections_per_block; i++) { |
Nathan Fontenot | d336016 | 2011-01-20 10:44:29 -0600 | [diff] [blame] | 144 | pfn = section_nr_to_pfn(mem->start_section_nr + i); |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 145 | ret &= is_mem_section_removable(pfn, PAGES_PER_SECTION); |
| 146 | } |
| 147 | |
Badari Pulavarty | 5c755e9 | 2008-07-23 21:28:19 -0700 | [diff] [blame] | 148 | return sprintf(buf, "%d\n", ret); |
| 149 | } |
| 150 | |
| 151 | /* |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 152 | * online, offline, going offline, etc. |
| 153 | */ |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 154 | static ssize_t show_mem_state(struct device *dev, |
| 155 | struct device_attribute *attr, char *buf) |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 156 | { |
| 157 | struct memory_block *mem = |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 158 | container_of(dev, struct memory_block, dev); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 159 | ssize_t len = 0; |
| 160 | |
| 161 | /* |
| 162 | * We can probably put these states in a nice little array |
| 163 | * so that they're not open-coded |
| 164 | */ |
| 165 | switch (mem->state) { |
| 166 | case MEM_ONLINE: |
| 167 | len = sprintf(buf, "online\n"); |
| 168 | break; |
| 169 | case MEM_OFFLINE: |
| 170 | len = sprintf(buf, "offline\n"); |
| 171 | break; |
| 172 | case MEM_GOING_OFFLINE: |
| 173 | len = sprintf(buf, "going-offline\n"); |
| 174 | break; |
| 175 | default: |
| 176 | len = sprintf(buf, "ERROR-UNKNOWN-%ld\n", |
| 177 | mem->state); |
| 178 | WARN_ON(1); |
| 179 | break; |
| 180 | } |
| 181 | |
| 182 | return len; |
| 183 | } |
| 184 | |
Yasunori Goto | 7b78d33 | 2007-10-21 16:41:36 -0700 | [diff] [blame] | 185 | int memory_notify(unsigned long val, void *v) |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 186 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 187 | return blocking_notifier_call_chain(&memory_chain, val, v); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 188 | } |
| 189 | |
Robert Jennings | 925cc71 | 2009-12-17 14:44:38 +0000 | [diff] [blame] | 190 | int memory_isolate_notify(unsigned long val, void *v) |
| 191 | { |
| 192 | return atomic_notifier_call_chain(&memory_isolate_chain, val, v); |
| 193 | } |
| 194 | |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 195 | /* |
Mel Gorman | 2bbcb878 | 2011-10-17 16:38:20 +0200 | [diff] [blame] | 196 | * The probe routines leave the pages reserved, just as the bootmem code does. |
| 197 | * Make sure they're still that way. |
| 198 | */ |
Tang Chen | 6056d61 | 2013-04-29 15:08:40 -0700 | [diff] [blame] | 199 | static bool pages_correctly_reserved(unsigned long start_pfn) |
Mel Gorman | 2bbcb878 | 2011-10-17 16:38:20 +0200 | [diff] [blame] | 200 | { |
| 201 | int i, j; |
| 202 | struct page *page; |
| 203 | unsigned long pfn = start_pfn; |
| 204 | |
| 205 | /* |
| 206 | * memmap between sections is not contiguous except with |
| 207 | * SPARSEMEM_VMEMMAP. We lookup the page once per section |
| 208 | * and assume memmap is contiguous within each section |
| 209 | */ |
| 210 | for (i = 0; i < sections_per_block; i++, pfn += PAGES_PER_SECTION) { |
| 211 | if (WARN_ON_ONCE(!pfn_valid(pfn))) |
| 212 | return false; |
| 213 | page = pfn_to_page(pfn); |
| 214 | |
| 215 | for (j = 0; j < PAGES_PER_SECTION; j++) { |
| 216 | if (PageReserved(page + j)) |
| 217 | continue; |
| 218 | |
| 219 | printk(KERN_WARNING "section number %ld page number %d " |
| 220 | "not reserved, was it already online?\n", |
| 221 | pfn_to_section_nr(pfn), j); |
| 222 | |
| 223 | return false; |
| 224 | } |
| 225 | } |
| 226 | |
| 227 | return true; |
| 228 | } |
| 229 | |
| 230 | /* |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 231 | * MEMORY_HOTPLUG depends on SPARSEMEM in mm/Kconfig, so it is |
| 232 | * OK to have direct references to sparsemem variables in here. |
| 233 | */ |
| 234 | static int |
Lai Jiangshan | 511c2ab | 2012-12-11 16:03:16 -0800 | [diff] [blame] | 235 | 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] | 236 | { |
Wen Congyang | a16cee1 | 2012-10-08 16:33:58 -0700 | [diff] [blame] | 237 | unsigned long start_pfn; |
Anton Blanchard | 5409d2c | 2011-05-11 17:25:14 +1000 | [diff] [blame] | 238 | unsigned long nr_pages = PAGES_PER_SECTION * sections_per_block; |
Greg Kroah-Hartman | de0ed36 | 2011-10-18 14:00:57 -0700 | [diff] [blame] | 239 | struct page *first_page; |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 240 | int ret; |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 241 | |
Greg Kroah-Hartman | de0ed36 | 2011-10-18 14:00:57 -0700 | [diff] [blame] | 242 | first_page = pfn_to_page(phys_index << PFN_SECTION_SHIFT); |
Wen Congyang | a16cee1 | 2012-10-08 16:33:58 -0700 | [diff] [blame] | 243 | start_pfn = page_to_pfn(first_page); |
Greg Kroah-Hartman | de0ed36 | 2011-10-18 14:00:57 -0700 | [diff] [blame] | 244 | |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 245 | switch (action) { |
| 246 | case MEM_ONLINE: |
Tang Chen | 6056d61 | 2013-04-29 15:08:40 -0700 | [diff] [blame] | 247 | if (!pages_correctly_reserved(start_pfn)) |
Mel Gorman | 2bbcb878 | 2011-10-17 16:38:20 +0200 | [diff] [blame] | 248 | return -EBUSY; |
| 249 | |
Lai Jiangshan | 511c2ab | 2012-12-11 16:03:16 -0800 | [diff] [blame] | 250 | ret = online_pages(start_pfn, nr_pages, online_type); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 251 | break; |
| 252 | case MEM_OFFLINE: |
Wen Congyang | a16cee1 | 2012-10-08 16:33:58 -0700 | [diff] [blame] | 253 | ret = offline_pages(start_pfn, nr_pages); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 254 | break; |
| 255 | default: |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 256 | WARN(1, KERN_WARNING "%s(%ld, %ld) unknown action: " |
| 257 | "%ld\n", __func__, phys_index, action, action); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 258 | ret = -EINVAL; |
| 259 | } |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 260 | |
| 261 | return ret; |
| 262 | } |
| 263 | |
Wen Congyang | e90bdb7 | 2012-10-08 16:34:01 -0700 | [diff] [blame] | 264 | static int __memory_block_change_state(struct memory_block *mem, |
Lai Jiangshan | 511c2ab | 2012-12-11 16:03:16 -0800 | [diff] [blame] | 265 | unsigned long to_state, unsigned long from_state_req, |
| 266 | int online_type) |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 267 | { |
Greg Kroah-Hartman | de0ed36 | 2011-10-18 14:00:57 -0700 | [diff] [blame] | 268 | int ret = 0; |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 269 | |
Rafael J. Wysocki | 4960e05 | 2013-05-08 14:18:37 +0200 | [diff] [blame] | 270 | if (mem->state != from_state_req) |
| 271 | return -EINVAL; |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 272 | |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 273 | if (to_state == MEM_OFFLINE) |
| 274 | mem->state = MEM_GOING_OFFLINE; |
| 275 | |
Lai Jiangshan | 511c2ab | 2012-12-11 16:03:16 -0800 | [diff] [blame] | 276 | ret = memory_block_action(mem->start_section_nr, to_state, online_type); |
Rafael J. Wysocki | b2c064b | 2013-05-23 10:38:55 +0200 | [diff] [blame] | 277 | mem->state = ret ? from_state_req : to_state; |
Rafael J. Wysocki | 4960e05 | 2013-05-08 14:18:37 +0200 | [diff] [blame] | 278 | return ret; |
| 279 | } |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 280 | |
Rafael J. Wysocki | 4960e05 | 2013-05-08 14:18:37 +0200 | [diff] [blame] | 281 | static int memory_subsys_online(struct device *dev) |
| 282 | { |
| 283 | struct memory_block *mem = container_of(dev, struct memory_block, dev); |
| 284 | int ret; |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 285 | |
Rafael J. Wysocki | 4960e05 | 2013-05-08 14:18:37 +0200 | [diff] [blame] | 286 | mutex_lock(&mem->state_mutex); |
| 287 | |
| 288 | ret = mem->state == MEM_ONLINE ? 0 : |
| 289 | __memory_block_change_state(mem, MEM_ONLINE, MEM_OFFLINE, |
Rafael J. Wysocki | b2c064b | 2013-05-23 10:38:55 +0200 | [diff] [blame] | 290 | ONLINE_KEEP); |
Rafael J. Wysocki | 4960e05 | 2013-05-08 14:18:37 +0200 | [diff] [blame] | 291 | |
| 292 | mutex_unlock(&mem->state_mutex); |
| 293 | return ret; |
| 294 | } |
| 295 | |
| 296 | static int memory_subsys_offline(struct device *dev) |
| 297 | { |
| 298 | struct memory_block *mem = container_of(dev, struct memory_block, dev); |
| 299 | int ret; |
| 300 | |
| 301 | mutex_lock(&mem->state_mutex); |
| 302 | |
| 303 | ret = mem->state == MEM_OFFLINE ? 0 : |
| 304 | __memory_block_change_state(mem, MEM_OFFLINE, MEM_ONLINE, -1); |
| 305 | |
| 306 | mutex_unlock(&mem->state_mutex); |
| 307 | return ret; |
| 308 | } |
| 309 | |
| 310 | static int __memory_block_change_state_uevent(struct memory_block *mem, |
| 311 | unsigned long to_state, unsigned long from_state_req, |
| 312 | int online_type) |
| 313 | { |
| 314 | int ret = __memory_block_change_state(mem, to_state, from_state_req, |
| 315 | online_type); |
| 316 | if (!ret) { |
| 317 | switch (mem->state) { |
| 318 | case MEM_OFFLINE: |
| 319 | kobject_uevent(&mem->dev.kobj, KOBJ_OFFLINE); |
| 320 | break; |
| 321 | case MEM_ONLINE: |
| 322 | kobject_uevent(&mem->dev.kobj, KOBJ_ONLINE); |
| 323 | break; |
| 324 | default: |
| 325 | break; |
| 326 | } |
Michael Holzheu | f5138e4 | 2012-01-12 17:20:23 -0800 | [diff] [blame] | 327 | } |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 328 | return ret; |
| 329 | } |
| 330 | |
Wen Congyang | e90bdb7 | 2012-10-08 16:34:01 -0700 | [diff] [blame] | 331 | static int memory_block_change_state(struct memory_block *mem, |
Lai Jiangshan | 511c2ab | 2012-12-11 16:03:16 -0800 | [diff] [blame] | 332 | unsigned long to_state, unsigned long from_state_req, |
| 333 | int online_type) |
Wen Congyang | e90bdb7 | 2012-10-08 16:34:01 -0700 | [diff] [blame] | 334 | { |
| 335 | int ret; |
| 336 | |
| 337 | mutex_lock(&mem->state_mutex); |
Rafael J. Wysocki | 4960e05 | 2013-05-08 14:18:37 +0200 | [diff] [blame] | 338 | ret = __memory_block_change_state_uevent(mem, to_state, from_state_req, |
| 339 | online_type); |
Wen Congyang | e90bdb7 | 2012-10-08 16:34:01 -0700 | [diff] [blame] | 340 | mutex_unlock(&mem->state_mutex); |
| 341 | |
| 342 | return ret; |
| 343 | } |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 344 | static ssize_t |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 345 | store_mem_state(struct device *dev, |
| 346 | struct device_attribute *attr, const char *buf, size_t count) |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 347 | { |
| 348 | struct memory_block *mem; |
Rafael J. Wysocki | 4960e05 | 2013-05-08 14:18:37 +0200 | [diff] [blame] | 349 | bool offline; |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 350 | int ret = -EINVAL; |
| 351 | |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 352 | mem = container_of(dev, struct memory_block, dev); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 353 | |
Rafael J. Wysocki | 4960e05 | 2013-05-08 14:18:37 +0200 | [diff] [blame] | 354 | lock_device_hotplug(); |
| 355 | |
| 356 | if (!strncmp(buf, "online_kernel", min_t(int, count, 13))) { |
| 357 | offline = false; |
Lai Jiangshan | 511c2ab | 2012-12-11 16:03:16 -0800 | [diff] [blame] | 358 | ret = memory_block_change_state(mem, MEM_ONLINE, |
| 359 | MEM_OFFLINE, ONLINE_KERNEL); |
Rafael J. Wysocki | 4960e05 | 2013-05-08 14:18:37 +0200 | [diff] [blame] | 360 | } else if (!strncmp(buf, "online_movable", min_t(int, count, 14))) { |
| 361 | offline = false; |
Lai Jiangshan | 511c2ab | 2012-12-11 16:03:16 -0800 | [diff] [blame] | 362 | ret = memory_block_change_state(mem, MEM_ONLINE, |
| 363 | MEM_OFFLINE, ONLINE_MOVABLE); |
Rafael J. Wysocki | 4960e05 | 2013-05-08 14:18:37 +0200 | [diff] [blame] | 364 | } else if (!strncmp(buf, "online", min_t(int, count, 6))) { |
| 365 | offline = false; |
Lai Jiangshan | 511c2ab | 2012-12-11 16:03:16 -0800 | [diff] [blame] | 366 | ret = memory_block_change_state(mem, MEM_ONLINE, |
| 367 | MEM_OFFLINE, ONLINE_KEEP); |
Rafael J. Wysocki | 4960e05 | 2013-05-08 14:18:37 +0200 | [diff] [blame] | 368 | } else if(!strncmp(buf, "offline", min_t(int, count, 7))) { |
| 369 | offline = true; |
Lai Jiangshan | 511c2ab | 2012-12-11 16:03:16 -0800 | [diff] [blame] | 370 | ret = memory_block_change_state(mem, MEM_OFFLINE, |
| 371 | MEM_ONLINE, -1); |
Rafael J. Wysocki | 4960e05 | 2013-05-08 14:18:37 +0200 | [diff] [blame] | 372 | } |
| 373 | if (!ret) |
| 374 | dev->offline = offline; |
| 375 | |
| 376 | unlock_device_hotplug(); |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 377 | |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 378 | if (ret) |
| 379 | return ret; |
| 380 | return count; |
| 381 | } |
| 382 | |
| 383 | /* |
| 384 | * phys_device is a bad name for this. What I really want |
| 385 | * is a way to differentiate between memory ranges that |
| 386 | * are part of physical devices that constitute |
| 387 | * a complete removable unit or fru. |
| 388 | * i.e. do these ranges belong to the same physical device, |
| 389 | * s.t. if I offline all of these sections I can then |
| 390 | * remove the physical device? |
| 391 | */ |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 392 | static ssize_t show_phys_device(struct device *dev, |
| 393 | struct device_attribute *attr, char *buf) |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 394 | { |
| 395 | struct memory_block *mem = |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 396 | container_of(dev, struct memory_block, dev); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 397 | return sprintf(buf, "%d\n", mem->phys_device); |
| 398 | } |
| 399 | |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 400 | static DEVICE_ATTR(phys_index, 0444, show_mem_start_phys_index, NULL); |
| 401 | static DEVICE_ATTR(end_phys_index, 0444, show_mem_end_phys_index, NULL); |
| 402 | static DEVICE_ATTR(state, 0644, show_mem_state, store_mem_state); |
| 403 | static DEVICE_ATTR(phys_device, 0444, show_phys_device, NULL); |
| 404 | static DEVICE_ATTR(removable, 0444, show_mem_removable, NULL); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 405 | |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 406 | /* |
| 407 | * Block size attribute stuff |
| 408 | */ |
| 409 | static ssize_t |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 410 | print_block_size(struct device *dev, struct device_attribute *attr, |
Andi Kleen | 8564a6c | 2010-01-05 12:48:06 +0100 | [diff] [blame] | 411 | char *buf) |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 412 | { |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 413 | return sprintf(buf, "%lx\n", get_memory_block_size()); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 414 | } |
| 415 | |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 416 | static DEVICE_ATTR(block_size_bytes, 0444, print_block_size, NULL); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 417 | |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 418 | /* |
| 419 | * Some architectures will have custom drivers to do this, and |
| 420 | * will not need to do it from userspace. The fake hot-add code |
| 421 | * as well as ppc64 will do all of their discovery in userspace |
| 422 | * and will require this interface. |
| 423 | */ |
| 424 | #ifdef CONFIG_ARCH_MEMORY_PROBE |
| 425 | static ssize_t |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 426 | memory_probe_store(struct device *dev, struct device_attribute *attr, |
Andi Kleen | 28812fe | 2010-01-05 12:48:07 +0100 | [diff] [blame] | 427 | const char *buf, size_t count) |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 428 | { |
| 429 | u64 phys_addr; |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 430 | int nid; |
Nathan Fontenot | 6add7cd | 2011-01-31 10:55:23 -0600 | [diff] [blame] | 431 | int i, ret; |
Anton Blanchard | 61b94fe | 2011-09-15 06:26:15 +1000 | [diff] [blame] | 432 | unsigned long pages_per_block = PAGES_PER_SECTION * sections_per_block; |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 433 | |
| 434 | phys_addr = simple_strtoull(buf, NULL, 0); |
| 435 | |
Anton Blanchard | 61b94fe | 2011-09-15 06:26:15 +1000 | [diff] [blame] | 436 | if (phys_addr & ((pages_per_block << PAGE_SHIFT) - 1)) |
| 437 | return -EINVAL; |
| 438 | |
Nathan Fontenot | 6add7cd | 2011-01-31 10:55:23 -0600 | [diff] [blame] | 439 | for (i = 0; i < sections_per_block; i++) { |
| 440 | nid = memory_add_physaddr_to_nid(phys_addr); |
| 441 | ret = add_memory(nid, phys_addr, |
| 442 | PAGES_PER_SECTION << PAGE_SHIFT); |
| 443 | if (ret) |
Nikanth Karthikesan | 9f0af69 | 2011-03-24 11:46:18 +0530 | [diff] [blame] | 444 | goto out; |
Nathan Fontenot | 6add7cd | 2011-01-31 10:55:23 -0600 | [diff] [blame] | 445 | |
| 446 | phys_addr += MIN_MEMORY_BLOCK_SIZE; |
| 447 | } |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 448 | |
Nikanth Karthikesan | 9f0af69 | 2011-03-24 11:46:18 +0530 | [diff] [blame] | 449 | ret = count; |
| 450 | out: |
| 451 | return ret; |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 452 | } |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 453 | |
Nathan Fontenot | 96b2c0f | 2013-06-04 14:42:28 -0500 | [diff] [blame] | 454 | static DEVICE_ATTR(probe, S_IWUSR, NULL, memory_probe_store); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 455 | #endif |
| 456 | |
Andi Kleen | facb601 | 2009-12-16 12:20:00 +0100 | [diff] [blame] | 457 | #ifdef CONFIG_MEMORY_FAILURE |
| 458 | /* |
| 459 | * Support for offlining pages of memory |
| 460 | */ |
| 461 | |
| 462 | /* Soft offline a page */ |
| 463 | static ssize_t |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 464 | store_soft_offline_page(struct device *dev, |
| 465 | struct device_attribute *attr, |
Andi Kleen | 28812fe | 2010-01-05 12:48:07 +0100 | [diff] [blame] | 466 | const char *buf, size_t count) |
Andi Kleen | facb601 | 2009-12-16 12:20:00 +0100 | [diff] [blame] | 467 | { |
| 468 | int ret; |
| 469 | u64 pfn; |
| 470 | if (!capable(CAP_SYS_ADMIN)) |
| 471 | return -EPERM; |
Jingoo Han | 34da5e6 | 2013-07-26 13:10:22 +0900 | [diff] [blame] | 472 | if (kstrtoull(buf, 0, &pfn) < 0) |
Andi Kleen | facb601 | 2009-12-16 12:20:00 +0100 | [diff] [blame] | 473 | return -EINVAL; |
| 474 | pfn >>= PAGE_SHIFT; |
| 475 | if (!pfn_valid(pfn)) |
| 476 | return -ENXIO; |
| 477 | ret = soft_offline_page(pfn_to_page(pfn), 0); |
| 478 | return ret == 0 ? count : ret; |
| 479 | } |
| 480 | |
| 481 | /* Forcibly offline a page, including killing processes. */ |
| 482 | static ssize_t |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 483 | store_hard_offline_page(struct device *dev, |
| 484 | struct device_attribute *attr, |
Andi Kleen | 28812fe | 2010-01-05 12:48:07 +0100 | [diff] [blame] | 485 | const char *buf, size_t count) |
Andi Kleen | facb601 | 2009-12-16 12:20:00 +0100 | [diff] [blame] | 486 | { |
| 487 | int ret; |
| 488 | u64 pfn; |
| 489 | if (!capable(CAP_SYS_ADMIN)) |
| 490 | return -EPERM; |
Jingoo Han | 34da5e6 | 2013-07-26 13:10:22 +0900 | [diff] [blame] | 491 | if (kstrtoull(buf, 0, &pfn) < 0) |
Andi Kleen | facb601 | 2009-12-16 12:20:00 +0100 | [diff] [blame] | 492 | return -EINVAL; |
| 493 | pfn >>= PAGE_SHIFT; |
Tony Luck | cd42f4a | 2011-12-15 10:48:12 -0800 | [diff] [blame] | 494 | ret = memory_failure(pfn, 0, 0); |
Andi Kleen | facb601 | 2009-12-16 12:20:00 +0100 | [diff] [blame] | 495 | return ret ? ret : count; |
| 496 | } |
| 497 | |
Felipe Balbi | 74fef7a | 2013-02-18 21:09:03 +0200 | [diff] [blame] | 498 | static DEVICE_ATTR(soft_offline_page, S_IWUSR, NULL, store_soft_offline_page); |
| 499 | 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] | 500 | #endif |
| 501 | |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 502 | /* |
| 503 | * Note that phys_device is optional. It is here to allow for |
| 504 | * differentiation between which *physical* devices each |
| 505 | * section belongs to... |
| 506 | */ |
Heiko Carstens | bc32df0 | 2010-03-15 00:35:03 -0400 | [diff] [blame] | 507 | int __weak arch_get_memory_phys_device(unsigned long start_pfn) |
| 508 | { |
| 509 | return 0; |
| 510 | } |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 511 | |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 512 | /* |
| 513 | * A reference for the returned object is held and the reference for the |
| 514 | * hinted object is released. |
| 515 | */ |
Robin Holt | 9838303 | 2010-09-29 14:00:55 -0500 | [diff] [blame] | 516 | struct memory_block *find_memory_block_hinted(struct mem_section *section, |
| 517 | struct memory_block *hint) |
| 518 | { |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 519 | int block_id = base_memory_block_id(__section_nr(section)); |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 520 | struct device *hintdev = hint ? &hint->dev : NULL; |
| 521 | struct device *dev; |
Robin Holt | 9838303 | 2010-09-29 14:00:55 -0500 | [diff] [blame] | 522 | |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 523 | dev = subsys_find_device_by_id(&memory_subsys, block_id, hintdev); |
| 524 | if (hint) |
| 525 | put_device(&hint->dev); |
| 526 | if (!dev) |
Robin Holt | 9838303 | 2010-09-29 14:00:55 -0500 | [diff] [blame] | 527 | return NULL; |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 528 | return container_of(dev, struct memory_block, dev); |
Robin Holt | 9838303 | 2010-09-29 14:00:55 -0500 | [diff] [blame] | 529 | } |
| 530 | |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 531 | /* |
| 532 | * For now, we have a linear search to go find the appropriate |
| 533 | * memory_block corresponding to a particular phys_index. If |
| 534 | * this gets to be a real problem, we can always use a radix |
| 535 | * tree or something here. |
| 536 | * |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 537 | * This could be made generic for all device subsystems. |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 538 | */ |
Gary Hade | c04fc58 | 2009-01-06 14:39:14 -0800 | [diff] [blame] | 539 | struct memory_block *find_memory_block(struct mem_section *section) |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 540 | { |
Robin Holt | 9838303 | 2010-09-29 14:00:55 -0500 | [diff] [blame] | 541 | return find_memory_block_hinted(section, NULL); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 542 | } |
| 543 | |
Nathan Fontenot | 96b2c0f | 2013-06-04 14:42:28 -0500 | [diff] [blame] | 544 | static struct attribute *memory_memblk_attrs[] = { |
| 545 | &dev_attr_phys_index.attr, |
| 546 | &dev_attr_end_phys_index.attr, |
| 547 | &dev_attr_state.attr, |
| 548 | &dev_attr_phys_device.attr, |
| 549 | &dev_attr_removable.attr, |
| 550 | NULL |
| 551 | }; |
| 552 | |
| 553 | static struct attribute_group memory_memblk_attr_group = { |
| 554 | .attrs = memory_memblk_attrs, |
| 555 | }; |
| 556 | |
| 557 | static const struct attribute_group *memory_memblk_attr_groups[] = { |
| 558 | &memory_memblk_attr_group, |
| 559 | NULL, |
| 560 | }; |
| 561 | |
| 562 | /* |
| 563 | * register_memory - Setup a sysfs device for a memory block |
| 564 | */ |
| 565 | static |
| 566 | int register_memory(struct memory_block *memory) |
| 567 | { |
| 568 | int error; |
| 569 | |
| 570 | memory->dev.bus = &memory_subsys; |
| 571 | memory->dev.id = memory->start_section_nr / sections_per_block; |
| 572 | memory->dev.release = memory_block_release; |
| 573 | memory->dev.groups = memory_memblk_attr_groups; |
Linus Torvalds | f991fae | 2013-07-03 14:35:40 -0700 | [diff] [blame] | 574 | memory->dev.offline = memory->state == MEM_OFFLINE; |
Nathan Fontenot | 96b2c0f | 2013-06-04 14:42:28 -0500 | [diff] [blame] | 575 | |
| 576 | error = device_register(&memory->dev); |
| 577 | return error; |
| 578 | } |
| 579 | |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 580 | static int init_memory_block(struct memory_block **memory, |
| 581 | struct mem_section *section, unsigned long state) |
Nathan Fontenot | e4619c8 | 2010-10-19 12:44:20 -0500 | [diff] [blame] | 582 | { |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 583 | struct memory_block *mem; |
Nathan Fontenot | e4619c8 | 2010-10-19 12:44:20 -0500 | [diff] [blame] | 584 | unsigned long start_pfn; |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 585 | int scn_nr; |
Nathan Fontenot | e4619c8 | 2010-10-19 12:44:20 -0500 | [diff] [blame] | 586 | int ret = 0; |
| 587 | |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 588 | mem = kzalloc(sizeof(*mem), GFP_KERNEL); |
Nathan Fontenot | e4619c8 | 2010-10-19 12:44:20 -0500 | [diff] [blame] | 589 | if (!mem) |
| 590 | return -ENOMEM; |
| 591 | |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 592 | scn_nr = __section_nr(section); |
Nathan Fontenot | d336016 | 2011-01-20 10:44:29 -0600 | [diff] [blame] | 593 | mem->start_section_nr = |
| 594 | base_memory_block_id(scn_nr) * sections_per_block; |
| 595 | mem->end_section_nr = mem->start_section_nr + sections_per_block - 1; |
Nathan Fontenot | e4619c8 | 2010-10-19 12:44:20 -0500 | [diff] [blame] | 596 | mem->state = state; |
Nathan Fontenot | 0768121 | 2010-10-19 12:46:19 -0500 | [diff] [blame] | 597 | mem->section_count++; |
Nathan Fontenot | e4619c8 | 2010-10-19 12:44:20 -0500 | [diff] [blame] | 598 | mutex_init(&mem->state_mutex); |
Nathan Fontenot | d336016 | 2011-01-20 10:44:29 -0600 | [diff] [blame] | 599 | start_pfn = section_nr_to_pfn(mem->start_section_nr); |
Nathan Fontenot | e4619c8 | 2010-10-19 12:44:20 -0500 | [diff] [blame] | 600 | mem->phys_device = arch_get_memory_phys_device(start_pfn); |
| 601 | |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 602 | ret = register_memory(mem); |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 603 | |
| 604 | *memory = mem; |
| 605 | return ret; |
| 606 | } |
| 607 | |
| 608 | static int add_memory_section(int nid, struct mem_section *section, |
Yinghai Lu | 321bf4e | 2012-01-30 13:57:12 -0800 | [diff] [blame] | 609 | struct memory_block **mem_p, |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 610 | unsigned long state, enum mem_add_context context) |
| 611 | { |
Yinghai Lu | 321bf4e | 2012-01-30 13:57:12 -0800 | [diff] [blame] | 612 | struct memory_block *mem = NULL; |
| 613 | int scn_nr = __section_nr(section); |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 614 | int ret = 0; |
| 615 | |
Yinghai Lu | 321bf4e | 2012-01-30 13:57:12 -0800 | [diff] [blame] | 616 | if (context == BOOT) { |
| 617 | /* same memory block ? */ |
| 618 | if (mem_p && *mem_p) |
| 619 | if (scn_nr >= (*mem_p)->start_section_nr && |
| 620 | scn_nr <= (*mem_p)->end_section_nr) { |
| 621 | mem = *mem_p; |
| 622 | kobject_get(&mem->dev.kobj); |
| 623 | } |
| 624 | } else |
| 625 | mem = find_memory_block(section); |
| 626 | |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 627 | if (mem) { |
| 628 | mem->section_count++; |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 629 | kobject_put(&mem->dev.kobj); |
Yinghai Lu | 321bf4e | 2012-01-30 13:57:12 -0800 | [diff] [blame] | 630 | } else { |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 631 | ret = init_memory_block(&mem, section, state); |
Yinghai Lu | 321bf4e | 2012-01-30 13:57:12 -0800 | [diff] [blame] | 632 | /* store memory_block pointer for next loop */ |
| 633 | if (!ret && context == BOOT) |
| 634 | if (mem_p) |
| 635 | *mem_p = mem; |
| 636 | } |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 637 | |
Nathan Fontenot | e4619c8 | 2010-10-19 12:44:20 -0500 | [diff] [blame] | 638 | if (!ret) { |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 639 | if (context == HOTPLUG && |
| 640 | mem->section_count == sections_per_block) |
Nathan Fontenot | e4619c8 | 2010-10-19 12:44:20 -0500 | [diff] [blame] | 641 | ret = register_mem_sect_under_node(mem, nid); |
| 642 | } |
| 643 | |
| 644 | return ret; |
| 645 | } |
| 646 | |
David Rientjes | 4edd7ce | 2013-04-29 15:08:22 -0700 | [diff] [blame] | 647 | /* |
| 648 | * need an interface for the VM to add new memory regions, |
| 649 | * but without onlining it. |
| 650 | */ |
| 651 | int register_new_memory(int nid, struct mem_section *section) |
| 652 | { |
Seth Jennings | b1eaef3 | 2013-08-20 12:12:57 -0500 | [diff] [blame^] | 653 | int ret; |
| 654 | |
| 655 | mutex_lock(&mem_sysfs_mutex); |
| 656 | ret = add_memory_section(nid, section, NULL, MEM_OFFLINE, HOTPLUG); |
| 657 | mutex_unlock(&mem_sysfs_mutex); |
| 658 | |
| 659 | return ret; |
David Rientjes | 4edd7ce | 2013-04-29 15:08:22 -0700 | [diff] [blame] | 660 | } |
| 661 | |
| 662 | #ifdef CONFIG_MEMORY_HOTREMOVE |
| 663 | static void |
| 664 | unregister_memory(struct memory_block *memory) |
| 665 | { |
| 666 | BUG_ON(memory->dev.bus != &memory_subsys); |
| 667 | |
| 668 | /* drop the ref. we got in remove_memory_block() */ |
| 669 | kobject_put(&memory->dev.kobj); |
| 670 | device_unregister(&memory->dev); |
| 671 | } |
| 672 | |
| 673 | static int remove_memory_block(unsigned long node_id, |
| 674 | struct mem_section *section, int phys_device) |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 675 | { |
| 676 | struct memory_block *mem; |
| 677 | |
Nathan Fontenot | 2938ffb | 2010-10-19 12:45:24 -0500 | [diff] [blame] | 678 | mutex_lock(&mem_sysfs_mutex); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 679 | mem = find_memory_block(section); |
Nathan Fontenot | d336016 | 2011-01-20 10:44:29 -0600 | [diff] [blame] | 680 | unregister_mem_sect_under_nodes(mem, __section_nr(section)); |
Nathan Fontenot | 0768121 | 2010-10-19 12:46:19 -0500 | [diff] [blame] | 681 | |
| 682 | mem->section_count--; |
Nathan Fontenot | 96b2c0f | 2013-06-04 14:42:28 -0500 | [diff] [blame] | 683 | if (mem->section_count == 0) |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 684 | unregister_memory(mem); |
Nathan Fontenot | 96b2c0f | 2013-06-04 14:42:28 -0500 | [diff] [blame] | 685 | else |
Kay Sievers | 10fbcf4 | 2011-12-21 14:48:43 -0800 | [diff] [blame] | 686 | kobject_put(&mem->dev.kobj); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 687 | |
Nathan Fontenot | 2938ffb | 2010-10-19 12:45:24 -0500 | [diff] [blame] | 688 | mutex_unlock(&mem_sysfs_mutex); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 689 | return 0; |
| 690 | } |
| 691 | |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 692 | int unregister_memory_section(struct mem_section *section) |
| 693 | { |
Andy Whitcroft | 540557b | 2007-10-16 01:24:11 -0700 | [diff] [blame] | 694 | if (!present_section(section)) |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 695 | return -EINVAL; |
| 696 | |
| 697 | return remove_memory_block(0, section, 0); |
| 698 | } |
David Rientjes | 4edd7ce | 2013-04-29 15:08:22 -0700 | [diff] [blame] | 699 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 700 | |
Yasuaki Ishimatsu | 6677e3e | 2013-02-22 16:32:52 -0800 | [diff] [blame] | 701 | /* return true if the memory block is offlined, otherwise, return false */ |
| 702 | bool is_memblock_offlined(struct memory_block *mem) |
| 703 | { |
| 704 | return mem->state == MEM_OFFLINE; |
| 705 | } |
| 706 | |
Nathan Fontenot | 96b2c0f | 2013-06-04 14:42:28 -0500 | [diff] [blame] | 707 | static struct attribute *memory_root_attrs[] = { |
| 708 | #ifdef CONFIG_ARCH_MEMORY_PROBE |
| 709 | &dev_attr_probe.attr, |
| 710 | #endif |
| 711 | |
| 712 | #ifdef CONFIG_MEMORY_FAILURE |
| 713 | &dev_attr_soft_offline_page.attr, |
| 714 | &dev_attr_hard_offline_page.attr, |
| 715 | #endif |
| 716 | |
| 717 | &dev_attr_block_size_bytes.attr, |
| 718 | NULL |
| 719 | }; |
| 720 | |
| 721 | static struct attribute_group memory_root_attr_group = { |
| 722 | .attrs = memory_root_attrs, |
| 723 | }; |
| 724 | |
| 725 | static const struct attribute_group *memory_root_attr_groups[] = { |
| 726 | &memory_root_attr_group, |
| 727 | NULL, |
| 728 | }; |
| 729 | |
Wen Congyang | e90bdb7 | 2012-10-08 16:34:01 -0700 | [diff] [blame] | 730 | /* |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 731 | * Initialize the sysfs support for memory devices... |
| 732 | */ |
| 733 | int __init memory_dev_init(void) |
| 734 | { |
| 735 | unsigned int i; |
| 736 | int ret; |
Andrew Morton | 28ec24e | 2006-12-06 20:37:29 -0800 | [diff] [blame] | 737 | int err; |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 738 | unsigned long block_sz; |
Yinghai Lu | 321bf4e | 2012-01-30 13:57:12 -0800 | [diff] [blame] | 739 | struct memory_block *mem = NULL; |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 740 | |
Nathan Fontenot | 96b2c0f | 2013-06-04 14:42:28 -0500 | [diff] [blame] | 741 | ret = subsys_system_register(&memory_subsys, memory_root_attr_groups); |
Andrew Morton | 28ec24e | 2006-12-06 20:37:29 -0800 | [diff] [blame] | 742 | if (ret) |
| 743 | goto out; |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 744 | |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 745 | block_sz = get_memory_block_size(); |
| 746 | sections_per_block = block_sz / MIN_MEMORY_BLOCK_SIZE; |
| 747 | |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 748 | /* |
| 749 | * Create entries for memory sections that were found |
| 750 | * during boot and have been initialized |
| 751 | */ |
Seth Jennings | b1eaef3 | 2013-08-20 12:12:57 -0500 | [diff] [blame^] | 752 | mutex_lock(&mem_sysfs_mutex); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 753 | for (i = 0; i < NR_MEM_SECTIONS; i++) { |
Andy Whitcroft | 540557b | 2007-10-16 01:24:11 -0700 | [diff] [blame] | 754 | if (!present_section_nr(i)) |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 755 | continue; |
Yinghai Lu | 321bf4e | 2012-01-30 13:57:12 -0800 | [diff] [blame] | 756 | /* don't need to reuse memory_block if only one per block */ |
| 757 | err = add_memory_section(0, __nr_to_section(i), |
| 758 | (sections_per_block == 1) ? NULL : &mem, |
| 759 | MEM_ONLINE, |
Nathan Fontenot | 0c2c99b | 2011-01-20 10:43:34 -0600 | [diff] [blame] | 760 | BOOT); |
Andrew Morton | 28ec24e | 2006-12-06 20:37:29 -0800 | [diff] [blame] | 761 | if (!ret) |
| 762 | ret = err; |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 763 | } |
Seth Jennings | b1eaef3 | 2013-08-20 12:12:57 -0500 | [diff] [blame^] | 764 | mutex_unlock(&mem_sysfs_mutex); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 765 | |
Andrew Morton | 28ec24e | 2006-12-06 20:37:29 -0800 | [diff] [blame] | 766 | out: |
| 767 | if (ret) |
Harvey Harrison | 2b3a302 | 2008-03-04 16:41:05 -0800 | [diff] [blame] | 768 | printk(KERN_ERR "%s() failed: %d\n", __func__, ret); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 769 | return ret; |
| 770 | } |