Loading...
Note: File does not exist in v6.8.
1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * This file contains NUMA specific variables and functions which can
7 * be split away from DISCONTIGMEM and are used on NUMA machines with
8 * contiguous memory.
9 * 2002/08/07 Erich Focht <efocht@ess.nec.de>
10 * Populate cpu entries in sysfs for non-numa systems as well
11 * Intel Corporation - Ashok Raj
12 * 02/27/2006 Zhang, Yanmin
13 * Populate cpu cache entries in sysfs for cpu cache info
14 */
15
16#include <linux/cpu.h>
17#include <linux/kernel.h>
18#include <linux/mm.h>
19#include <linux/node.h>
20#include <linux/slab.h>
21#include <linux/init.h>
22#include <linux/bootmem.h>
23#include <linux/nodemask.h>
24#include <linux/notifier.h>
25#include <linux/export.h>
26#include <asm/mmzone.h>
27#include <asm/numa.h>
28#include <asm/cpu.h>
29
30static struct ia64_cpu *sysfs_cpus;
31
32void arch_fix_phys_package_id(int num, u32 slot)
33{
34#ifdef CONFIG_SMP
35 if (cpu_data(num)->socket_id == -1)
36 cpu_data(num)->socket_id = slot;
37#endif
38}
39EXPORT_SYMBOL_GPL(arch_fix_phys_package_id);
40
41
42#ifdef CONFIG_HOTPLUG_CPU
43int __ref arch_register_cpu(int num)
44{
45#ifdef CONFIG_ACPI
46 /*
47 * If CPEI can be re-targeted or if this is not
48 * CPEI target, then it is hotpluggable
49 */
50 if (can_cpei_retarget() || !is_cpu_cpei_target(num))
51 sysfs_cpus[num].cpu.hotpluggable = 1;
52 map_cpu_to_node(num, node_cpuid[num].nid);
53#endif
54 return register_cpu(&sysfs_cpus[num].cpu, num);
55}
56EXPORT_SYMBOL(arch_register_cpu);
57
58void __ref arch_unregister_cpu(int num)
59{
60 unregister_cpu(&sysfs_cpus[num].cpu);
61#ifdef CONFIG_ACPI
62 unmap_cpu_from_node(num, cpu_to_node(num));
63#endif
64}
65EXPORT_SYMBOL(arch_unregister_cpu);
66#else
67static int __init arch_register_cpu(int num)
68{
69 return register_cpu(&sysfs_cpus[num].cpu, num);
70}
71#endif /*CONFIG_HOTPLUG_CPU*/
72
73
74static int __init topology_init(void)
75{
76 int i, err = 0;
77
78#ifdef CONFIG_NUMA
79 /*
80 * MCD - Do we want to register all ONLINE nodes, or all POSSIBLE nodes?
81 */
82 for_each_online_node(i) {
83 if ((err = register_one_node(i)))
84 goto out;
85 }
86#endif
87
88 sysfs_cpus = kzalloc(sizeof(struct ia64_cpu) * NR_CPUS, GFP_KERNEL);
89 if (!sysfs_cpus)
90 panic("kzalloc in topology_init failed - NR_CPUS too big?");
91
92 for_each_present_cpu(i) {
93 if((err = arch_register_cpu(i)))
94 goto out;
95 }
96out:
97 return err;
98}
99
100subsys_initcall(topology_init);
101
102
103/*
104 * Export cpu cache information through sysfs
105 */
106
107/*
108 * A bunch of string array to get pretty printing
109 */
110static const char *cache_types[] = {
111 "", /* not used */
112 "Instruction",
113 "Data",
114 "Unified" /* unified */
115};
116
117static const char *cache_mattrib[]={
118 "WriteThrough",
119 "WriteBack",
120 "", /* reserved */
121 "" /* reserved */
122};
123
124struct cache_info {
125 pal_cache_config_info_t cci;
126 cpumask_t shared_cpu_map;
127 int level;
128 int type;
129 struct kobject kobj;
130};
131
132struct cpu_cache_info {
133 struct cache_info *cache_leaves;
134 int num_cache_leaves;
135 struct kobject kobj;
136};
137
138static struct cpu_cache_info all_cpu_cache_info[NR_CPUS];
139#define LEAF_KOBJECT_PTR(x,y) (&all_cpu_cache_info[x].cache_leaves[y])
140
141#ifdef CONFIG_SMP
142static void cache_shared_cpu_map_setup(unsigned int cpu,
143 struct cache_info * this_leaf)
144{
145 pal_cache_shared_info_t csi;
146 int num_shared, i = 0;
147 unsigned int j;
148
149 if (cpu_data(cpu)->threads_per_core <= 1 &&
150 cpu_data(cpu)->cores_per_socket <= 1) {
151 cpumask_set_cpu(cpu, &this_leaf->shared_cpu_map);
152 return;
153 }
154
155 if (ia64_pal_cache_shared_info(this_leaf->level,
156 this_leaf->type,
157 0,
158 &csi) != PAL_STATUS_SUCCESS)
159 return;
160
161 num_shared = (int) csi.num_shared;
162 do {
163 for_each_possible_cpu(j)
164 if (cpu_data(cpu)->socket_id == cpu_data(j)->socket_id
165 && cpu_data(j)->core_id == csi.log1_cid
166 && cpu_data(j)->thread_id == csi.log1_tid)
167 cpumask_set_cpu(j, &this_leaf->shared_cpu_map);
168
169 i++;
170 } while (i < num_shared &&
171 ia64_pal_cache_shared_info(this_leaf->level,
172 this_leaf->type,
173 i,
174 &csi) == PAL_STATUS_SUCCESS);
175}
176#else
177static void cache_shared_cpu_map_setup(unsigned int cpu,
178 struct cache_info * this_leaf)
179{
180 cpumask_set_cpu(cpu, &this_leaf->shared_cpu_map);
181 return;
182}
183#endif
184
185static ssize_t show_coherency_line_size(struct cache_info *this_leaf,
186 char *buf)
187{
188 return sprintf(buf, "%u\n", 1 << this_leaf->cci.pcci_line_size);
189}
190
191static ssize_t show_ways_of_associativity(struct cache_info *this_leaf,
192 char *buf)
193{
194 return sprintf(buf, "%u\n", this_leaf->cci.pcci_assoc);
195}
196
197static ssize_t show_attributes(struct cache_info *this_leaf, char *buf)
198{
199 return sprintf(buf,
200 "%s\n",
201 cache_mattrib[this_leaf->cci.pcci_cache_attr]);
202}
203
204static ssize_t show_size(struct cache_info *this_leaf, char *buf)
205{
206 return sprintf(buf, "%uK\n", this_leaf->cci.pcci_cache_size / 1024);
207}
208
209static ssize_t show_number_of_sets(struct cache_info *this_leaf, char *buf)
210{
211 unsigned number_of_sets = this_leaf->cci.pcci_cache_size;
212 number_of_sets /= this_leaf->cci.pcci_assoc;
213 number_of_sets /= 1 << this_leaf->cci.pcci_line_size;
214
215 return sprintf(buf, "%u\n", number_of_sets);
216}
217
218static ssize_t show_shared_cpu_map(struct cache_info *this_leaf, char *buf)
219{
220 cpumask_t shared_cpu_map;
221
222 cpumask_and(&shared_cpu_map,
223 &this_leaf->shared_cpu_map, cpu_online_mask);
224 return scnprintf(buf, PAGE_SIZE, "%*pb\n",
225 cpumask_pr_args(&shared_cpu_map));
226}
227
228static ssize_t show_type(struct cache_info *this_leaf, char *buf)
229{
230 int type = this_leaf->type + this_leaf->cci.pcci_unified;
231 return sprintf(buf, "%s\n", cache_types[type]);
232}
233
234static ssize_t show_level(struct cache_info *this_leaf, char *buf)
235{
236 return sprintf(buf, "%u\n", this_leaf->level);
237}
238
239struct cache_attr {
240 struct attribute attr;
241 ssize_t (*show)(struct cache_info *, char *);
242 ssize_t (*store)(struct cache_info *, const char *, size_t count);
243};
244
245#ifdef define_one_ro
246 #undef define_one_ro
247#endif
248#define define_one_ro(_name) \
249 static struct cache_attr _name = \
250__ATTR(_name, 0444, show_##_name, NULL)
251
252define_one_ro(level);
253define_one_ro(type);
254define_one_ro(coherency_line_size);
255define_one_ro(ways_of_associativity);
256define_one_ro(size);
257define_one_ro(number_of_sets);
258define_one_ro(shared_cpu_map);
259define_one_ro(attributes);
260
261static struct attribute * cache_default_attrs[] = {
262 &type.attr,
263 &level.attr,
264 &coherency_line_size.attr,
265 &ways_of_associativity.attr,
266 &attributes.attr,
267 &size.attr,
268 &number_of_sets.attr,
269 &shared_cpu_map.attr,
270 NULL
271};
272
273#define to_object(k) container_of(k, struct cache_info, kobj)
274#define to_attr(a) container_of(a, struct cache_attr, attr)
275
276static ssize_t ia64_cache_show(struct kobject * kobj, struct attribute * attr, char * buf)
277{
278 struct cache_attr *fattr = to_attr(attr);
279 struct cache_info *this_leaf = to_object(kobj);
280 ssize_t ret;
281
282 ret = fattr->show ? fattr->show(this_leaf, buf) : 0;
283 return ret;
284}
285
286static const struct sysfs_ops cache_sysfs_ops = {
287 .show = ia64_cache_show
288};
289
290static struct kobj_type cache_ktype = {
291 .sysfs_ops = &cache_sysfs_ops,
292 .default_attrs = cache_default_attrs,
293};
294
295static struct kobj_type cache_ktype_percpu_entry = {
296 .sysfs_ops = &cache_sysfs_ops,
297};
298
299static void cpu_cache_sysfs_exit(unsigned int cpu)
300{
301 kfree(all_cpu_cache_info[cpu].cache_leaves);
302 all_cpu_cache_info[cpu].cache_leaves = NULL;
303 all_cpu_cache_info[cpu].num_cache_leaves = 0;
304 memset(&all_cpu_cache_info[cpu].kobj, 0, sizeof(struct kobject));
305 return;
306}
307
308static int cpu_cache_sysfs_init(unsigned int cpu)
309{
310 unsigned long i, levels, unique_caches;
311 pal_cache_config_info_t cci;
312 int j;
313 long status;
314 struct cache_info *this_cache;
315 int num_cache_leaves = 0;
316
317 if ((status = ia64_pal_cache_summary(&levels, &unique_caches)) != 0) {
318 printk(KERN_ERR "ia64_pal_cache_summary=%ld\n", status);
319 return -1;
320 }
321
322 this_cache=kzalloc(sizeof(struct cache_info)*unique_caches,
323 GFP_KERNEL);
324 if (this_cache == NULL)
325 return -ENOMEM;
326
327 for (i=0; i < levels; i++) {
328 for (j=2; j >0 ; j--) {
329 if ((status=ia64_pal_cache_config_info(i,j, &cci)) !=
330 PAL_STATUS_SUCCESS)
331 continue;
332
333 this_cache[num_cache_leaves].cci = cci;
334 this_cache[num_cache_leaves].level = i + 1;
335 this_cache[num_cache_leaves].type = j;
336
337 cache_shared_cpu_map_setup(cpu,
338 &this_cache[num_cache_leaves]);
339 num_cache_leaves ++;
340 }
341 }
342
343 all_cpu_cache_info[cpu].cache_leaves = this_cache;
344 all_cpu_cache_info[cpu].num_cache_leaves = num_cache_leaves;
345
346 memset(&all_cpu_cache_info[cpu].kobj, 0, sizeof(struct kobject));
347
348 return 0;
349}
350
351/* Add cache interface for CPU device */
352static int cache_add_dev(unsigned int cpu)
353{
354 struct device *sys_dev = get_cpu_device(cpu);
355 unsigned long i, j;
356 struct cache_info *this_object;
357 int retval = 0;
358
359 if (all_cpu_cache_info[cpu].kobj.parent)
360 return 0;
361
362
363 retval = cpu_cache_sysfs_init(cpu);
364 if (unlikely(retval < 0))
365 return retval;
366
367 retval = kobject_init_and_add(&all_cpu_cache_info[cpu].kobj,
368 &cache_ktype_percpu_entry, &sys_dev->kobj,
369 "%s", "cache");
370 if (unlikely(retval < 0)) {
371 cpu_cache_sysfs_exit(cpu);
372 return retval;
373 }
374
375 for (i = 0; i < all_cpu_cache_info[cpu].num_cache_leaves; i++) {
376 this_object = LEAF_KOBJECT_PTR(cpu,i);
377 retval = kobject_init_and_add(&(this_object->kobj),
378 &cache_ktype,
379 &all_cpu_cache_info[cpu].kobj,
380 "index%1lu", i);
381 if (unlikely(retval)) {
382 for (j = 0; j < i; j++) {
383 kobject_put(&(LEAF_KOBJECT_PTR(cpu,j)->kobj));
384 }
385 kobject_put(&all_cpu_cache_info[cpu].kobj);
386 cpu_cache_sysfs_exit(cpu);
387 return retval;
388 }
389 kobject_uevent(&(this_object->kobj), KOBJ_ADD);
390 }
391 kobject_uevent(&all_cpu_cache_info[cpu].kobj, KOBJ_ADD);
392 return retval;
393}
394
395/* Remove cache interface for CPU device */
396static int cache_remove_dev(unsigned int cpu)
397{
398 unsigned long i;
399
400 for (i = 0; i < all_cpu_cache_info[cpu].num_cache_leaves; i++)
401 kobject_put(&(LEAF_KOBJECT_PTR(cpu,i)->kobj));
402
403 if (all_cpu_cache_info[cpu].kobj.parent) {
404 kobject_put(&all_cpu_cache_info[cpu].kobj);
405 memset(&all_cpu_cache_info[cpu].kobj,
406 0,
407 sizeof(struct kobject));
408 }
409
410 cpu_cache_sysfs_exit(cpu);
411
412 return 0;
413}
414
415static int __init cache_sysfs_init(void)
416{
417 int ret;
418
419 ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "ia64/topology:online",
420 cache_add_dev, cache_remove_dev);
421 WARN_ON(ret < 0);
422 return 0;
423}
424device_initcall(cache_sysfs_init);