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5ff193fb FY |
1 | /* |
2 | * User interface for Resource Alloction in Resource Director Technology(RDT) | |
3 | * | |
4 | * Copyright (C) 2016 Intel Corporation | |
5 | * | |
6 | * Author: Fenghua Yu <fenghua.yu@intel.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms and conditions of the GNU General Public License, | |
10 | * version 2, as published by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed in the hope it will be useful, but WITHOUT | |
13 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
15 | * more details. | |
16 | * | |
17 | * More information about RDT be found in the Intel (R) x86 Architecture | |
18 | * Software Developer Manual. | |
19 | */ | |
20 | ||
21 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
22 | ||
d9b48c86 | 23 | #include <linux/cacheinfo.h> |
12e0110c | 24 | #include <linux/cpu.h> |
37707ec6 | 25 | #include <linux/debugfs.h> |
5ff193fb | 26 | #include <linux/fs.h> |
23bf1b6b | 27 | #include <linux/fs_parser.h> |
5ff193fb FY |
28 | #include <linux/sysfs.h> |
29 | #include <linux/kernfs.h> | |
9b3a7fd0 | 30 | #include <linux/seq_buf.h> |
4e978d06 | 31 | #include <linux/seq_file.h> |
3f07c014 | 32 | #include <linux/sched/signal.h> |
29930025 | 33 | #include <linux/sched/task.h> |
5ff193fb | 34 | #include <linux/slab.h> |
e02737d5 | 35 | #include <linux/task_work.h> |
23bf1b6b | 36 | #include <linux/user_namespace.h> |
5ff193fb FY |
37 | |
38 | #include <uapi/linux/magic.h> | |
39 | ||
fa7d9493 BM |
40 | #include <asm/resctrl_sched.h> |
41 | #include "internal.h" | |
5ff193fb | 42 | |
4af4a88e VS |
43 | DEFINE_STATIC_KEY_FALSE(rdt_enable_key); |
44 | DEFINE_STATIC_KEY_FALSE(rdt_mon_enable_key); | |
1b5c0b75 | 45 | DEFINE_STATIC_KEY_FALSE(rdt_alloc_enable_key); |
cb2200e9 | 46 | static struct kernfs_root *rdt_root; |
5ff193fb FY |
47 | struct rdtgroup rdtgroup_default; |
48 | LIST_HEAD(rdt_all_groups); | |
49 | ||
4e978d06 FY |
50 | /* Kernel fs node for "info" directory under root */ |
51 | static struct kernfs_node *kn_info; | |
52 | ||
4af4a88e VS |
53 | /* Kernel fs node for "mon_groups" directory under root */ |
54 | static struct kernfs_node *kn_mongrp; | |
55 | ||
56 | /* Kernel fs node for "mon_data" directory under root */ | |
57 | static struct kernfs_node *kn_mondata; | |
58 | ||
9b3a7fd0 TL |
59 | static struct seq_buf last_cmd_status; |
60 | static char last_cmd_status_buf[512]; | |
61 | ||
37707ec6 RC |
62 | struct dentry *debugfs_resctrl; |
63 | ||
9b3a7fd0 TL |
64 | void rdt_last_cmd_clear(void) |
65 | { | |
66 | lockdep_assert_held(&rdtgroup_mutex); | |
67 | seq_buf_clear(&last_cmd_status); | |
68 | } | |
69 | ||
70 | void rdt_last_cmd_puts(const char *s) | |
71 | { | |
72 | lockdep_assert_held(&rdtgroup_mutex); | |
73 | seq_buf_puts(&last_cmd_status, s); | |
74 | } | |
75 | ||
76 | void rdt_last_cmd_printf(const char *fmt, ...) | |
77 | { | |
78 | va_list ap; | |
79 | ||
80 | va_start(ap, fmt); | |
81 | lockdep_assert_held(&rdtgroup_mutex); | |
82 | seq_buf_vprintf(&last_cmd_status, fmt, ap); | |
83 | va_end(ap); | |
84 | } | |
85 | ||
60cf5e10 FY |
86 | /* |
87 | * Trivial allocator for CLOSIDs. Since h/w only supports a small number, | |
88 | * we can keep a bitmap of free CLOSIDs in a single integer. | |
89 | * | |
90 | * Using a global CLOSID across all resources has some advantages and | |
91 | * some drawbacks: | |
92 | * + We can simply set "current->closid" to assign a task to a resource | |
93 | * group. | |
94 | * + Context switch code can avoid extra memory references deciding which | |
95 | * CLOSID to load into the PQR_ASSOC MSR | |
96 | * - We give up some options in configuring resource groups across multi-socket | |
97 | * systems. | |
98 | * - Our choices on how to configure each resource become progressively more | |
99 | * limited as the number of resources grows. | |
100 | */ | |
101 | static int closid_free_map; | |
c793da8e RC |
102 | static int closid_free_map_len; |
103 | ||
104 | int closids_supported(void) | |
105 | { | |
106 | return closid_free_map_len; | |
107 | } | |
60cf5e10 FY |
108 | |
109 | static void closid_init(void) | |
110 | { | |
111 | struct rdt_resource *r; | |
112 | int rdt_min_closid = 32; | |
113 | ||
114 | /* Compute rdt_min_closid across all resources */ | |
1b5c0b75 | 115 | for_each_alloc_enabled_rdt_resource(r) |
60cf5e10 FY |
116 | rdt_min_closid = min(rdt_min_closid, r->num_closid); |
117 | ||
118 | closid_free_map = BIT_MASK(rdt_min_closid) - 1; | |
119 | ||
120 | /* CLOSID 0 is always reserved for the default group */ | |
121 | closid_free_map &= ~1; | |
c793da8e | 122 | closid_free_map_len = rdt_min_closid; |
60cf5e10 FY |
123 | } |
124 | ||
cb2200e9 | 125 | static int closid_alloc(void) |
60cf5e10 | 126 | { |
0734ded1 | 127 | u32 closid = ffs(closid_free_map); |
60cf5e10 FY |
128 | |
129 | if (closid == 0) | |
130 | return -ENOSPC; | |
131 | closid--; | |
132 | closid_free_map &= ~(1 << closid); | |
133 | ||
134 | return closid; | |
135 | } | |
136 | ||
024d15be | 137 | void closid_free(int closid) |
60cf5e10 FY |
138 | { |
139 | closid_free_map |= 1 << closid; | |
140 | } | |
141 | ||
0b9aa656 RC |
142 | /** |
143 | * closid_allocated - test if provided closid is in use | |
144 | * @closid: closid to be tested | |
145 | * | |
146 | * Return: true if @closid is currently associated with a resource group, | |
147 | * false if @closid is free | |
148 | */ | |
95f0b77e | 149 | static bool closid_allocated(unsigned int closid) |
0b9aa656 RC |
150 | { |
151 | return (closid_free_map & (1 << closid)) == 0; | |
152 | } | |
153 | ||
472ef09b RC |
154 | /** |
155 | * rdtgroup_mode_by_closid - Return mode of resource group with closid | |
156 | * @closid: closid if the resource group | |
157 | * | |
158 | * Each resource group is associated with a @closid. Here the mode | |
159 | * of a resource group can be queried by searching for it using its closid. | |
160 | * | |
161 | * Return: mode as &enum rdtgrp_mode of resource group with closid @closid | |
162 | */ | |
163 | enum rdtgrp_mode rdtgroup_mode_by_closid(int closid) | |
164 | { | |
165 | struct rdtgroup *rdtgrp; | |
166 | ||
167 | list_for_each_entry(rdtgrp, &rdt_all_groups, rdtgroup_list) { | |
168 | if (rdtgrp->closid == closid) | |
169 | return rdtgrp->mode; | |
170 | } | |
171 | ||
172 | return RDT_NUM_MODES; | |
173 | } | |
174 | ||
d48d7a57 | 175 | static const char * const rdt_mode_str[] = { |
bb9fec69 RC |
176 | [RDT_MODE_SHAREABLE] = "shareable", |
177 | [RDT_MODE_EXCLUSIVE] = "exclusive", | |
178 | [RDT_MODE_PSEUDO_LOCKSETUP] = "pseudo-locksetup", | |
179 | [RDT_MODE_PSEUDO_LOCKED] = "pseudo-locked", | |
d48d7a57 RC |
180 | }; |
181 | ||
182 | /** | |
183 | * rdtgroup_mode_str - Return the string representation of mode | |
184 | * @mode: the resource group mode as &enum rdtgroup_mode | |
185 | * | |
186 | * Return: string representation of valid mode, "unknown" otherwise | |
187 | */ | |
188 | static const char *rdtgroup_mode_str(enum rdtgrp_mode mode) | |
189 | { | |
190 | if (mode < RDT_MODE_SHAREABLE || mode >= RDT_NUM_MODES) | |
191 | return "unknown"; | |
192 | ||
193 | return rdt_mode_str[mode]; | |
194 | } | |
195 | ||
4e978d06 FY |
196 | /* set uid and gid of rdtgroup dirs and files to that of the creator */ |
197 | static int rdtgroup_kn_set_ugid(struct kernfs_node *kn) | |
198 | { | |
199 | struct iattr iattr = { .ia_valid = ATTR_UID | ATTR_GID, | |
200 | .ia_uid = current_fsuid(), | |
201 | .ia_gid = current_fsgid(), }; | |
202 | ||
203 | if (uid_eq(iattr.ia_uid, GLOBAL_ROOT_UID) && | |
204 | gid_eq(iattr.ia_gid, GLOBAL_ROOT_GID)) | |
205 | return 0; | |
206 | ||
207 | return kernfs_setattr(kn, &iattr); | |
208 | } | |
209 | ||
210 | static int rdtgroup_add_file(struct kernfs_node *parent_kn, struct rftype *rft) | |
211 | { | |
212 | struct kernfs_node *kn; | |
213 | int ret; | |
214 | ||
215 | kn = __kernfs_create_file(parent_kn, rft->name, rft->mode, | |
488dee96 | 216 | GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, |
4e978d06 FY |
217 | 0, rft->kf_ops, rft, NULL, NULL); |
218 | if (IS_ERR(kn)) | |
219 | return PTR_ERR(kn); | |
220 | ||
221 | ret = rdtgroup_kn_set_ugid(kn); | |
222 | if (ret) { | |
223 | kernfs_remove(kn); | |
224 | return ret; | |
225 | } | |
226 | ||
227 | return 0; | |
228 | } | |
229 | ||
4e978d06 FY |
230 | static int rdtgroup_seqfile_show(struct seq_file *m, void *arg) |
231 | { | |
232 | struct kernfs_open_file *of = m->private; | |
233 | struct rftype *rft = of->kn->priv; | |
234 | ||
235 | if (rft->seq_show) | |
236 | return rft->seq_show(of, m, arg); | |
237 | return 0; | |
238 | } | |
239 | ||
240 | static ssize_t rdtgroup_file_write(struct kernfs_open_file *of, char *buf, | |
241 | size_t nbytes, loff_t off) | |
242 | { | |
243 | struct rftype *rft = of->kn->priv; | |
244 | ||
245 | if (rft->write) | |
246 | return rft->write(of, buf, nbytes, off); | |
247 | ||
248 | return -EINVAL; | |
249 | } | |
250 | ||
251 | static struct kernfs_ops rdtgroup_kf_single_ops = { | |
252 | .atomic_write_len = PAGE_SIZE, | |
253 | .write = rdtgroup_file_write, | |
254 | .seq_show = rdtgroup_seqfile_show, | |
255 | }; | |
256 | ||
d89b7379 VS |
257 | static struct kernfs_ops kf_mondata_ops = { |
258 | .atomic_write_len = PAGE_SIZE, | |
259 | .seq_show = rdtgroup_mondata_show, | |
260 | }; | |
261 | ||
4ffa3c97 JO |
262 | static bool is_cpu_list(struct kernfs_open_file *of) |
263 | { | |
264 | struct rftype *rft = of->kn->priv; | |
265 | ||
266 | return rft->flags & RFTYPE_FLAGS_CPUS_LIST; | |
267 | } | |
268 | ||
12e0110c TL |
269 | static int rdtgroup_cpus_show(struct kernfs_open_file *of, |
270 | struct seq_file *s, void *v) | |
271 | { | |
272 | struct rdtgroup *rdtgrp; | |
b61b8bba | 273 | struct cpumask *mask; |
12e0110c TL |
274 | int ret = 0; |
275 | ||
276 | rdtgrp = rdtgroup_kn_lock_live(of->kn); | |
277 | ||
4ffa3c97 | 278 | if (rdtgrp) { |
b61b8bba JJ |
279 | if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) { |
280 | if (!rdtgrp->plr->d) { | |
281 | rdt_last_cmd_clear(); | |
282 | rdt_last_cmd_puts("Cache domain offline\n"); | |
283 | ret = -ENODEV; | |
284 | } else { | |
285 | mask = &rdtgrp->plr->d->cpu_mask; | |
286 | seq_printf(s, is_cpu_list(of) ? | |
287 | "%*pbl\n" : "%*pb\n", | |
288 | cpumask_pr_args(mask)); | |
289 | } | |
290 | } else { | |
33dc3e41 RC |
291 | seq_printf(s, is_cpu_list(of) ? "%*pbl\n" : "%*pb\n", |
292 | cpumask_pr_args(&rdtgrp->cpu_mask)); | |
b61b8bba | 293 | } |
4ffa3c97 | 294 | } else { |
12e0110c | 295 | ret = -ENOENT; |
4ffa3c97 | 296 | } |
12e0110c TL |
297 | rdtgroup_kn_unlock(of->kn); |
298 | ||
299 | return ret; | |
300 | } | |
301 | ||
f4107702 | 302 | /* |
352940ec | 303 | * This is safe against resctrl_sched_in() called from __switch_to() |
f4107702 | 304 | * because __switch_to() is executed with interrupts disabled. A local call |
a9fcf862 | 305 | * from update_closid_rmid() is proteced against __switch_to() because |
f4107702 FY |
306 | * preemption is disabled. |
307 | */ | |
a9fcf862 | 308 | static void update_cpu_closid_rmid(void *info) |
f4107702 | 309 | { |
b09d981b VS |
310 | struct rdtgroup *r = info; |
311 | ||
a9fcf862 | 312 | if (r) { |
a9110b55 VS |
313 | this_cpu_write(pqr_state.default_closid, r->closid); |
314 | this_cpu_write(pqr_state.default_rmid, r->mon.rmid); | |
a9fcf862 | 315 | } |
b09d981b | 316 | |
f4107702 FY |
317 | /* |
318 | * We cannot unconditionally write the MSR because the current | |
319 | * executing task might have its own closid selected. Just reuse | |
320 | * the context switch code. | |
321 | */ | |
352940ec | 322 | resctrl_sched_in(); |
f4107702 FY |
323 | } |
324 | ||
0efc89be FY |
325 | /* |
326 | * Update the PGR_ASSOC MSR on all cpus in @cpu_mask, | |
327 | * | |
b09d981b | 328 | * Per task closids/rmids must have been set up before calling this function. |
0efc89be FY |
329 | */ |
330 | static void | |
a9fcf862 | 331 | update_closid_rmid(const struct cpumask *cpu_mask, struct rdtgroup *r) |
f4107702 FY |
332 | { |
333 | int cpu = get_cpu(); | |
334 | ||
335 | if (cpumask_test_cpu(cpu, cpu_mask)) | |
a9fcf862 VS |
336 | update_cpu_closid_rmid(r); |
337 | smp_call_function_many(cpu_mask, update_cpu_closid_rmid, r, 1); | |
f4107702 FY |
338 | put_cpu(); |
339 | } | |
340 | ||
a9fcf862 VS |
341 | static int cpus_mon_write(struct rdtgroup *rdtgrp, cpumask_var_t newmask, |
342 | cpumask_var_t tmpmask) | |
343 | { | |
344 | struct rdtgroup *prgrp = rdtgrp->mon.parent, *crgrp; | |
345 | struct list_head *head; | |
346 | ||
347 | /* Check whether cpus belong to parent ctrl group */ | |
348 | cpumask_andnot(tmpmask, newmask, &prgrp->cpu_mask); | |
94457b36 | 349 | if (cpumask_weight(tmpmask)) { |
723f1a0d | 350 | rdt_last_cmd_puts("Can only add CPUs to mongroup that belong to parent\n"); |
a9fcf862 | 351 | return -EINVAL; |
94457b36 | 352 | } |
a9fcf862 VS |
353 | |
354 | /* Check whether cpus are dropped from this group */ | |
355 | cpumask_andnot(tmpmask, &rdtgrp->cpu_mask, newmask); | |
356 | if (cpumask_weight(tmpmask)) { | |
357 | /* Give any dropped cpus to parent rdtgroup */ | |
358 | cpumask_or(&prgrp->cpu_mask, &prgrp->cpu_mask, tmpmask); | |
359 | update_closid_rmid(tmpmask, prgrp); | |
360 | } | |
361 | ||
362 | /* | |
363 | * If we added cpus, remove them from previous group that owned them | |
364 | * and update per-cpu rmid | |
365 | */ | |
366 | cpumask_andnot(tmpmask, newmask, &rdtgrp->cpu_mask); | |
367 | if (cpumask_weight(tmpmask)) { | |
368 | head = &prgrp->mon.crdtgrp_list; | |
369 | list_for_each_entry(crgrp, head, mon.crdtgrp_list) { | |
370 | if (crgrp == rdtgrp) | |
371 | continue; | |
372 | cpumask_andnot(&crgrp->cpu_mask, &crgrp->cpu_mask, | |
373 | tmpmask); | |
374 | } | |
375 | update_closid_rmid(tmpmask, rdtgrp); | |
376 | } | |
377 | ||
378 | /* Done pushing/pulling - update this group with new mask */ | |
379 | cpumask_copy(&rdtgrp->cpu_mask, newmask); | |
380 | ||
381 | return 0; | |
382 | } | |
383 | ||
384 | static void cpumask_rdtgrp_clear(struct rdtgroup *r, struct cpumask *m) | |
385 | { | |
386 | struct rdtgroup *crgrp; | |
387 | ||
388 | cpumask_andnot(&r->cpu_mask, &r->cpu_mask, m); | |
389 | /* update the child mon group masks as well*/ | |
390 | list_for_each_entry(crgrp, &r->mon.crdtgrp_list, mon.crdtgrp_list) | |
391 | cpumask_and(&crgrp->cpu_mask, &r->cpu_mask, &crgrp->cpu_mask); | |
392 | } | |
393 | ||
b09d981b | 394 | static int cpus_ctrl_write(struct rdtgroup *rdtgrp, cpumask_var_t newmask, |
a9fcf862 | 395 | cpumask_var_t tmpmask, cpumask_var_t tmpmask1) |
b09d981b | 396 | { |
a9fcf862 VS |
397 | struct rdtgroup *r, *crgrp; |
398 | struct list_head *head; | |
b09d981b VS |
399 | |
400 | /* Check whether cpus are dropped from this group */ | |
401 | cpumask_andnot(tmpmask, &rdtgrp->cpu_mask, newmask); | |
402 | if (cpumask_weight(tmpmask)) { | |
403 | /* Can't drop from default group */ | |
94457b36 TL |
404 | if (rdtgrp == &rdtgroup_default) { |
405 | rdt_last_cmd_puts("Can't drop CPUs from default group\n"); | |
b09d981b | 406 | return -EINVAL; |
94457b36 | 407 | } |
b09d981b VS |
408 | |
409 | /* Give any dropped cpus to rdtgroup_default */ | |
410 | cpumask_or(&rdtgroup_default.cpu_mask, | |
411 | &rdtgroup_default.cpu_mask, tmpmask); | |
a9fcf862 | 412 | update_closid_rmid(tmpmask, &rdtgroup_default); |
b09d981b VS |
413 | } |
414 | ||
415 | /* | |
a9fcf862 VS |
416 | * If we added cpus, remove them from previous group and |
417 | * the prev group's child groups that owned them | |
418 | * and update per-cpu closid/rmid. | |
b09d981b VS |
419 | */ |
420 | cpumask_andnot(tmpmask, newmask, &rdtgrp->cpu_mask); | |
421 | if (cpumask_weight(tmpmask)) { | |
422 | list_for_each_entry(r, &rdt_all_groups, rdtgroup_list) { | |
423 | if (r == rdtgrp) | |
424 | continue; | |
a9fcf862 VS |
425 | cpumask_and(tmpmask1, &r->cpu_mask, tmpmask); |
426 | if (cpumask_weight(tmpmask1)) | |
427 | cpumask_rdtgrp_clear(r, tmpmask1); | |
b09d981b | 428 | } |
a9fcf862 | 429 | update_closid_rmid(tmpmask, rdtgrp); |
b09d981b VS |
430 | } |
431 | ||
432 | /* Done pushing/pulling - update this group with new mask */ | |
433 | cpumask_copy(&rdtgrp->cpu_mask, newmask); | |
434 | ||
a9fcf862 VS |
435 | /* |
436 | * Clear child mon group masks since there is a new parent mask | |
437 | * now and update the rmid for the cpus the child lost. | |
438 | */ | |
439 | head = &rdtgrp->mon.crdtgrp_list; | |
440 | list_for_each_entry(crgrp, head, mon.crdtgrp_list) { | |
441 | cpumask_and(tmpmask, &rdtgrp->cpu_mask, &crgrp->cpu_mask); | |
442 | update_closid_rmid(tmpmask, rdtgrp); | |
443 | cpumask_clear(&crgrp->cpu_mask); | |
444 | } | |
445 | ||
b09d981b VS |
446 | return 0; |
447 | } | |
448 | ||
12e0110c TL |
449 | static ssize_t rdtgroup_cpus_write(struct kernfs_open_file *of, |
450 | char *buf, size_t nbytes, loff_t off) | |
451 | { | |
a9fcf862 | 452 | cpumask_var_t tmpmask, newmask, tmpmask1; |
b09d981b | 453 | struct rdtgroup *rdtgrp; |
f4107702 | 454 | int ret; |
12e0110c TL |
455 | |
456 | if (!buf) | |
457 | return -EINVAL; | |
458 | ||
459 | if (!zalloc_cpumask_var(&tmpmask, GFP_KERNEL)) | |
460 | return -ENOMEM; | |
461 | if (!zalloc_cpumask_var(&newmask, GFP_KERNEL)) { | |
462 | free_cpumask_var(tmpmask); | |
463 | return -ENOMEM; | |
464 | } | |
a9fcf862 VS |
465 | if (!zalloc_cpumask_var(&tmpmask1, GFP_KERNEL)) { |
466 | free_cpumask_var(tmpmask); | |
467 | free_cpumask_var(newmask); | |
468 | return -ENOMEM; | |
469 | } | |
a2584e1d | 470 | |
12e0110c | 471 | rdtgrp = rdtgroup_kn_lock_live(of->kn); |
94457b36 | 472 | rdt_last_cmd_clear(); |
12e0110c TL |
473 | if (!rdtgrp) { |
474 | ret = -ENOENT; | |
723f1a0d | 475 | rdt_last_cmd_puts("Directory was removed\n"); |
12e0110c TL |
476 | goto unlock; |
477 | } | |
478 | ||
c966dac8 RC |
479 | if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED || |
480 | rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) { | |
481 | ret = -EINVAL; | |
723f1a0d | 482 | rdt_last_cmd_puts("Pseudo-locking in progress\n"); |
c966dac8 RC |
483 | goto unlock; |
484 | } | |
485 | ||
4ffa3c97 JO |
486 | if (is_cpu_list(of)) |
487 | ret = cpulist_parse(buf, newmask); | |
488 | else | |
489 | ret = cpumask_parse(buf, newmask); | |
490 | ||
94457b36 | 491 | if (ret) { |
723f1a0d | 492 | rdt_last_cmd_puts("Bad CPU list/mask\n"); |
12e0110c | 493 | goto unlock; |
94457b36 | 494 | } |
12e0110c | 495 | |
12e0110c TL |
496 | /* check that user didn't specify any offline cpus */ |
497 | cpumask_andnot(tmpmask, newmask, cpu_online_mask); | |
498 | if (cpumask_weight(tmpmask)) { | |
499 | ret = -EINVAL; | |
723f1a0d | 500 | rdt_last_cmd_puts("Can only assign online CPUs\n"); |
a2584e1d | 501 | goto unlock; |
12e0110c TL |
502 | } |
503 | ||
b09d981b | 504 | if (rdtgrp->type == RDTCTRL_GROUP) |
a9fcf862 VS |
505 | ret = cpus_ctrl_write(rdtgrp, newmask, tmpmask, tmpmask1); |
506 | else if (rdtgrp->type == RDTMON_GROUP) | |
507 | ret = cpus_mon_write(rdtgrp, newmask, tmpmask); | |
b09d981b VS |
508 | else |
509 | ret = -EINVAL; | |
12e0110c | 510 | |
12e0110c TL |
511 | unlock: |
512 | rdtgroup_kn_unlock(of->kn); | |
513 | free_cpumask_var(tmpmask); | |
514 | free_cpumask_var(newmask); | |
a9fcf862 | 515 | free_cpumask_var(tmpmask1); |
12e0110c TL |
516 | |
517 | return ret ?: nbytes; | |
518 | } | |
519 | ||
e02737d5 FY |
520 | struct task_move_callback { |
521 | struct callback_head work; | |
522 | struct rdtgroup *rdtgrp; | |
523 | }; | |
524 | ||
525 | static void move_myself(struct callback_head *head) | |
526 | { | |
527 | struct task_move_callback *callback; | |
528 | struct rdtgroup *rdtgrp; | |
529 | ||
530 | callback = container_of(head, struct task_move_callback, work); | |
531 | rdtgrp = callback->rdtgrp; | |
532 | ||
533 | /* | |
534 | * If resource group was deleted before this task work callback | |
535 | * was invoked, then assign the task to root group and free the | |
536 | * resource group. | |
537 | */ | |
538 | if (atomic_dec_and_test(&rdtgrp->waitcount) && | |
539 | (rdtgrp->flags & RDT_DELETED)) { | |
540 | current->closid = 0; | |
d6aaba61 | 541 | current->rmid = 0; |
e02737d5 FY |
542 | kfree(rdtgrp); |
543 | } | |
544 | ||
74fcdae1 | 545 | preempt_disable(); |
4f341a5e | 546 | /* update PQR_ASSOC MSR to make resource group go into effect */ |
352940ec | 547 | resctrl_sched_in(); |
74fcdae1 | 548 | preempt_enable(); |
4f341a5e | 549 | |
e02737d5 FY |
550 | kfree(callback); |
551 | } | |
552 | ||
553 | static int __rdtgroup_move_task(struct task_struct *tsk, | |
554 | struct rdtgroup *rdtgrp) | |
555 | { | |
556 | struct task_move_callback *callback; | |
557 | int ret; | |
558 | ||
559 | callback = kzalloc(sizeof(*callback), GFP_KERNEL); | |
560 | if (!callback) | |
561 | return -ENOMEM; | |
562 | callback->work.func = move_myself; | |
563 | callback->rdtgrp = rdtgrp; | |
564 | ||
565 | /* | |
566 | * Take a refcount, so rdtgrp cannot be freed before the | |
567 | * callback has been invoked. | |
568 | */ | |
569 | atomic_inc(&rdtgrp->waitcount); | |
570 | ret = task_work_add(tsk, &callback->work, true); | |
571 | if (ret) { | |
572 | /* | |
573 | * Task is exiting. Drop the refcount and free the callback. | |
574 | * No need to check the refcount as the group cannot be | |
575 | * deleted before the write function unlocks rdtgroup_mutex. | |
576 | */ | |
577 | atomic_dec(&rdtgrp->waitcount); | |
578 | kfree(callback); | |
723f1a0d | 579 | rdt_last_cmd_puts("Task exited\n"); |
e02737d5 | 580 | } else { |
d6aaba61 VS |
581 | /* |
582 | * For ctrl_mon groups move both closid and rmid. | |
583 | * For monitor groups, can move the tasks only from | |
584 | * their parent CTRL group. | |
585 | */ | |
586 | if (rdtgrp->type == RDTCTRL_GROUP) { | |
587 | tsk->closid = rdtgrp->closid; | |
588 | tsk->rmid = rdtgrp->mon.rmid; | |
589 | } else if (rdtgrp->type == RDTMON_GROUP) { | |
29e74f35 | 590 | if (rdtgrp->mon.parent->closid == tsk->closid) { |
d6aaba61 | 591 | tsk->rmid = rdtgrp->mon.rmid; |
29e74f35 TL |
592 | } else { |
593 | rdt_last_cmd_puts("Can't move task to different control group\n"); | |
d6aaba61 | 594 | ret = -EINVAL; |
29e74f35 | 595 | } |
d6aaba61 | 596 | } |
e02737d5 FY |
597 | } |
598 | return ret; | |
599 | } | |
600 | ||
f7a6e3f6 RC |
601 | /** |
602 | * rdtgroup_tasks_assigned - Test if tasks have been assigned to resource group | |
603 | * @r: Resource group | |
604 | * | |
605 | * Return: 1 if tasks have been assigned to @r, 0 otherwise | |
606 | */ | |
607 | int rdtgroup_tasks_assigned(struct rdtgroup *r) | |
608 | { | |
609 | struct task_struct *p, *t; | |
610 | int ret = 0; | |
611 | ||
612 | lockdep_assert_held(&rdtgroup_mutex); | |
613 | ||
614 | rcu_read_lock(); | |
615 | for_each_process_thread(p, t) { | |
616 | if ((r->type == RDTCTRL_GROUP && t->closid == r->closid) || | |
617 | (r->type == RDTMON_GROUP && t->rmid == r->mon.rmid)) { | |
618 | ret = 1; | |
619 | break; | |
620 | } | |
621 | } | |
622 | rcu_read_unlock(); | |
623 | ||
624 | return ret; | |
625 | } | |
626 | ||
e02737d5 FY |
627 | static int rdtgroup_task_write_permission(struct task_struct *task, |
628 | struct kernfs_open_file *of) | |
629 | { | |
630 | const struct cred *tcred = get_task_cred(task); | |
631 | const struct cred *cred = current_cred(); | |
632 | int ret = 0; | |
633 | ||
634 | /* | |
635 | * Even if we're attaching all tasks in the thread group, we only | |
636 | * need to check permissions on one of them. | |
637 | */ | |
638 | if (!uid_eq(cred->euid, GLOBAL_ROOT_UID) && | |
639 | !uid_eq(cred->euid, tcred->uid) && | |
29e74f35 TL |
640 | !uid_eq(cred->euid, tcred->suid)) { |
641 | rdt_last_cmd_printf("No permission to move task %d\n", task->pid); | |
e02737d5 | 642 | ret = -EPERM; |
29e74f35 | 643 | } |
e02737d5 FY |
644 | |
645 | put_cred(tcred); | |
646 | return ret; | |
647 | } | |
648 | ||
649 | static int rdtgroup_move_task(pid_t pid, struct rdtgroup *rdtgrp, | |
650 | struct kernfs_open_file *of) | |
651 | { | |
652 | struct task_struct *tsk; | |
653 | int ret; | |
654 | ||
655 | rcu_read_lock(); | |
656 | if (pid) { | |
657 | tsk = find_task_by_vpid(pid); | |
658 | if (!tsk) { | |
659 | rcu_read_unlock(); | |
29e74f35 | 660 | rdt_last_cmd_printf("No task %d\n", pid); |
e02737d5 FY |
661 | return -ESRCH; |
662 | } | |
663 | } else { | |
664 | tsk = current; | |
665 | } | |
666 | ||
667 | get_task_struct(tsk); | |
668 | rcu_read_unlock(); | |
669 | ||
670 | ret = rdtgroup_task_write_permission(tsk, of); | |
671 | if (!ret) | |
672 | ret = __rdtgroup_move_task(tsk, rdtgrp); | |
673 | ||
674 | put_task_struct(tsk); | |
675 | return ret; | |
676 | } | |
677 | ||
678 | static ssize_t rdtgroup_tasks_write(struct kernfs_open_file *of, | |
679 | char *buf, size_t nbytes, loff_t off) | |
680 | { | |
681 | struct rdtgroup *rdtgrp; | |
682 | int ret = 0; | |
683 | pid_t pid; | |
684 | ||
685 | if (kstrtoint(strstrip(buf), 0, &pid) || pid < 0) | |
686 | return -EINVAL; | |
687 | rdtgrp = rdtgroup_kn_lock_live(of->kn); | |
c966dac8 RC |
688 | if (!rdtgrp) { |
689 | rdtgroup_kn_unlock(of->kn); | |
690 | return -ENOENT; | |
691 | } | |
29e74f35 | 692 | rdt_last_cmd_clear(); |
e02737d5 | 693 | |
c966dac8 RC |
694 | if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED || |
695 | rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) { | |
696 | ret = -EINVAL; | |
723f1a0d | 697 | rdt_last_cmd_puts("Pseudo-locking in progress\n"); |
c966dac8 RC |
698 | goto unlock; |
699 | } | |
700 | ||
701 | ret = rdtgroup_move_task(pid, rdtgrp, of); | |
e02737d5 | 702 | |
c966dac8 | 703 | unlock: |
e02737d5 FY |
704 | rdtgroup_kn_unlock(of->kn); |
705 | ||
706 | return ret ?: nbytes; | |
707 | } | |
708 | ||
709 | static void show_rdt_tasks(struct rdtgroup *r, struct seq_file *s) | |
710 | { | |
711 | struct task_struct *p, *t; | |
712 | ||
713 | rcu_read_lock(); | |
714 | for_each_process_thread(p, t) { | |
d6aaba61 VS |
715 | if ((r->type == RDTCTRL_GROUP && t->closid == r->closid) || |
716 | (r->type == RDTMON_GROUP && t->rmid == r->mon.rmid)) | |
e02737d5 FY |
717 | seq_printf(s, "%d\n", t->pid); |
718 | } | |
719 | rcu_read_unlock(); | |
720 | } | |
721 | ||
722 | static int rdtgroup_tasks_show(struct kernfs_open_file *of, | |
723 | struct seq_file *s, void *v) | |
724 | { | |
725 | struct rdtgroup *rdtgrp; | |
726 | int ret = 0; | |
727 | ||
728 | rdtgrp = rdtgroup_kn_lock_live(of->kn); | |
729 | if (rdtgrp) | |
730 | show_rdt_tasks(rdtgrp, s); | |
731 | else | |
732 | ret = -ENOENT; | |
733 | rdtgroup_kn_unlock(of->kn); | |
734 | ||
735 | return ret; | |
736 | } | |
737 | ||
9b3a7fd0 TL |
738 | static int rdt_last_cmd_status_show(struct kernfs_open_file *of, |
739 | struct seq_file *seq, void *v) | |
740 | { | |
741 | int len; | |
742 | ||
743 | mutex_lock(&rdtgroup_mutex); | |
744 | len = seq_buf_used(&last_cmd_status); | |
745 | if (len) | |
746 | seq_printf(seq, "%.*s", len, last_cmd_status_buf); | |
747 | else | |
748 | seq_puts(seq, "ok\n"); | |
749 | mutex_unlock(&rdtgroup_mutex); | |
750 | return 0; | |
751 | } | |
752 | ||
4e978d06 FY |
753 | static int rdt_num_closids_show(struct kernfs_open_file *of, |
754 | struct seq_file *seq, void *v) | |
755 | { | |
756 | struct rdt_resource *r = of->kn->parent->priv; | |
757 | ||
758 | seq_printf(seq, "%d\n", r->num_closid); | |
4e978d06 FY |
759 | return 0; |
760 | } | |
761 | ||
2545e9f5 | 762 | static int rdt_default_ctrl_show(struct kernfs_open_file *of, |
4e978d06 FY |
763 | struct seq_file *seq, void *v) |
764 | { | |
765 | struct rdt_resource *r = of->kn->parent->priv; | |
766 | ||
2545e9f5 | 767 | seq_printf(seq, "%x\n", r->default_ctrl); |
4e978d06 FY |
768 | return 0; |
769 | } | |
770 | ||
53a114a6 SL |
771 | static int rdt_min_cbm_bits_show(struct kernfs_open_file *of, |
772 | struct seq_file *seq, void *v) | |
773 | { | |
774 | struct rdt_resource *r = of->kn->parent->priv; | |
775 | ||
d3e11b4d | 776 | seq_printf(seq, "%u\n", r->cache.min_cbm_bits); |
db69ef65 VS |
777 | return 0; |
778 | } | |
779 | ||
0dd2d749 FY |
780 | static int rdt_shareable_bits_show(struct kernfs_open_file *of, |
781 | struct seq_file *seq, void *v) | |
782 | { | |
783 | struct rdt_resource *r = of->kn->parent->priv; | |
784 | ||
785 | seq_printf(seq, "%x\n", r->cache.shareable_bits); | |
786 | return 0; | |
787 | } | |
788 | ||
e6519011 RC |
789 | /** |
790 | * rdt_bit_usage_show - Display current usage of resources | |
791 | * | |
792 | * A domain is a shared resource that can now be allocated differently. Here | |
793 | * we display the current regions of the domain as an annotated bitmask. | |
794 | * For each domain of this resource its allocation bitmask | |
795 | * is annotated as below to indicate the current usage of the corresponding bit: | |
796 | * 0 - currently unused | |
797 | * X - currently available for sharing and used by software and hardware | |
798 | * H - currently used by hardware only but available for software use | |
799 | * S - currently used and shareable by software only | |
800 | * E - currently used exclusively by one resource group | |
f4e80d67 | 801 | * P - currently pseudo-locked by one resource group |
e6519011 RC |
802 | */ |
803 | static int rdt_bit_usage_show(struct kernfs_open_file *of, | |
804 | struct seq_file *seq, void *v) | |
805 | { | |
806 | struct rdt_resource *r = of->kn->parent->priv; | |
f4e80d67 RC |
807 | u32 sw_shareable = 0, hw_shareable = 0; |
808 | u32 exclusive = 0, pseudo_locked = 0; | |
e6519011 | 809 | struct rdt_domain *dom; |
f4e80d67 | 810 | int i, hwb, swb, excl, psl; |
e6519011 RC |
811 | enum rdtgrp_mode mode; |
812 | bool sep = false; | |
813 | u32 *ctrl; | |
814 | ||
815 | mutex_lock(&rdtgroup_mutex); | |
816 | hw_shareable = r->cache.shareable_bits; | |
817 | list_for_each_entry(dom, &r->domains, list) { | |
818 | if (sep) | |
819 | seq_putc(seq, ';'); | |
820 | ctrl = dom->ctrl_val; | |
821 | sw_shareable = 0; | |
822 | exclusive = 0; | |
823 | seq_printf(seq, "%d=", dom->id); | |
47d53b18 | 824 | for (i = 0; i < closids_supported(); i++, ctrl++) { |
e6519011 RC |
825 | if (!closid_allocated(i)) |
826 | continue; | |
827 | mode = rdtgroup_mode_by_closid(i); | |
828 | switch (mode) { | |
829 | case RDT_MODE_SHAREABLE: | |
830 | sw_shareable |= *ctrl; | |
831 | break; | |
832 | case RDT_MODE_EXCLUSIVE: | |
833 | exclusive |= *ctrl; | |
834 | break; | |
f4e80d67 | 835 | case RDT_MODE_PSEUDO_LOCKSETUP: |
bb9fec69 | 836 | /* |
f4e80d67 RC |
837 | * RDT_MODE_PSEUDO_LOCKSETUP is possible |
838 | * here but not included since the CBM | |
839 | * associated with this CLOSID in this mode | |
840 | * is not initialized and no task or cpu can be | |
841 | * assigned this CLOSID. | |
bb9fec69 | 842 | */ |
f4e80d67 | 843 | break; |
bb9fec69 | 844 | case RDT_MODE_PSEUDO_LOCKED: |
e6519011 RC |
845 | case RDT_NUM_MODES: |
846 | WARN(1, | |
847 | "invalid mode for closid %d\n", i); | |
848 | break; | |
849 | } | |
850 | } | |
851 | for (i = r->cache.cbm_len - 1; i >= 0; i--) { | |
f4e80d67 | 852 | pseudo_locked = dom->plr ? dom->plr->cbm : 0; |
e6519011 RC |
853 | hwb = test_bit(i, (unsigned long *)&hw_shareable); |
854 | swb = test_bit(i, (unsigned long *)&sw_shareable); | |
855 | excl = test_bit(i, (unsigned long *)&exclusive); | |
f4e80d67 | 856 | psl = test_bit(i, (unsigned long *)&pseudo_locked); |
e6519011 RC |
857 | if (hwb && swb) |
858 | seq_putc(seq, 'X'); | |
859 | else if (hwb && !swb) | |
860 | seq_putc(seq, 'H'); | |
861 | else if (!hwb && swb) | |
862 | seq_putc(seq, 'S'); | |
863 | else if (excl) | |
864 | seq_putc(seq, 'E'); | |
f4e80d67 RC |
865 | else if (psl) |
866 | seq_putc(seq, 'P'); | |
e6519011 RC |
867 | else /* Unused bits remain */ |
868 | seq_putc(seq, '0'); | |
869 | } | |
870 | sep = true; | |
871 | } | |
872 | seq_putc(seq, '\n'); | |
873 | mutex_unlock(&rdtgroup_mutex); | |
874 | return 0; | |
875 | } | |
876 | ||
db69ef65 VS |
877 | static int rdt_min_bw_show(struct kernfs_open_file *of, |
878 | struct seq_file *seq, void *v) | |
879 | { | |
880 | struct rdt_resource *r = of->kn->parent->priv; | |
53a114a6 | 881 | |
db69ef65 VS |
882 | seq_printf(seq, "%u\n", r->membw.min_bw); |
883 | return 0; | |
884 | } | |
885 | ||
d4ab3320 VS |
886 | static int rdt_num_rmids_show(struct kernfs_open_file *of, |
887 | struct seq_file *seq, void *v) | |
888 | { | |
889 | struct rdt_resource *r = of->kn->parent->priv; | |
890 | ||
891 | seq_printf(seq, "%d\n", r->num_rmid); | |
892 | ||
893 | return 0; | |
894 | } | |
895 | ||
896 | static int rdt_mon_features_show(struct kernfs_open_file *of, | |
897 | struct seq_file *seq, void *v) | |
898 | { | |
899 | struct rdt_resource *r = of->kn->parent->priv; | |
900 | struct mon_evt *mevt; | |
901 | ||
902 | list_for_each_entry(mevt, &r->evt_list, list) | |
903 | seq_printf(seq, "%s\n", mevt->name); | |
904 | ||
905 | return 0; | |
906 | } | |
907 | ||
db69ef65 VS |
908 | static int rdt_bw_gran_show(struct kernfs_open_file *of, |
909 | struct seq_file *seq, void *v) | |
910 | { | |
911 | struct rdt_resource *r = of->kn->parent->priv; | |
912 | ||
913 | seq_printf(seq, "%u\n", r->membw.bw_gran); | |
914 | return 0; | |
915 | } | |
916 | ||
917 | static int rdt_delay_linear_show(struct kernfs_open_file *of, | |
918 | struct seq_file *seq, void *v) | |
919 | { | |
920 | struct rdt_resource *r = of->kn->parent->priv; | |
921 | ||
922 | seq_printf(seq, "%u\n", r->membw.delay_linear); | |
53a114a6 SL |
923 | return 0; |
924 | } | |
925 | ||
d4ab3320 VS |
926 | static int max_threshold_occ_show(struct kernfs_open_file *of, |
927 | struct seq_file *seq, void *v) | |
928 | { | |
929 | struct rdt_resource *r = of->kn->parent->priv; | |
930 | ||
352940ec | 931 | seq_printf(seq, "%u\n", resctrl_cqm_threshold * r->mon_scale); |
d4ab3320 VS |
932 | |
933 | return 0; | |
934 | } | |
935 | ||
936 | static ssize_t max_threshold_occ_write(struct kernfs_open_file *of, | |
937 | char *buf, size_t nbytes, loff_t off) | |
938 | { | |
939 | struct rdt_resource *r = of->kn->parent->priv; | |
940 | unsigned int bytes; | |
941 | int ret; | |
942 | ||
943 | ret = kstrtouint(buf, 0, &bytes); | |
944 | if (ret) | |
945 | return ret; | |
946 | ||
947 | if (bytes > (boot_cpu_data.x86_cache_size * 1024)) | |
948 | return -EINVAL; | |
949 | ||
352940ec | 950 | resctrl_cqm_threshold = bytes / r->mon_scale; |
d4ab3320 | 951 | |
5707b46a | 952 | return nbytes; |
d4ab3320 VS |
953 | } |
954 | ||
d48d7a57 RC |
955 | /* |
956 | * rdtgroup_mode_show - Display mode of this resource group | |
957 | */ | |
958 | static int rdtgroup_mode_show(struct kernfs_open_file *of, | |
959 | struct seq_file *s, void *v) | |
960 | { | |
961 | struct rdtgroup *rdtgrp; | |
962 | ||
963 | rdtgrp = rdtgroup_kn_lock_live(of->kn); | |
964 | if (!rdtgrp) { | |
965 | rdtgroup_kn_unlock(of->kn); | |
966 | return -ENOENT; | |
967 | } | |
968 | ||
969 | seq_printf(s, "%s\n", rdtgroup_mode_str(rdtgrp->mode)); | |
970 | ||
971 | rdtgroup_kn_unlock(of->kn); | |
972 | return 0; | |
973 | } | |
974 | ||
521348b0 RC |
975 | /** |
976 | * rdt_cdp_peer_get - Retrieve CDP peer if it exists | |
977 | * @r: RDT resource to which RDT domain @d belongs | |
978 | * @d: Cache instance for which a CDP peer is requested | |
979 | * @r_cdp: RDT resource that shares hardware with @r (RDT resource peer) | |
980 | * Used to return the result. | |
981 | * @d_cdp: RDT domain that shares hardware with @d (RDT domain peer) | |
982 | * Used to return the result. | |
983 | * | |
984 | * RDT resources are managed independently and by extension the RDT domains | |
985 | * (RDT resource instances) are managed independently also. The Code and | |
986 | * Data Prioritization (CDP) RDT resources, while managed independently, | |
987 | * could refer to the same underlying hardware. For example, | |
988 | * RDT_RESOURCE_L2CODE and RDT_RESOURCE_L2DATA both refer to the L2 cache. | |
989 | * | |
990 | * When provided with an RDT resource @r and an instance of that RDT | |
991 | * resource @d rdt_cdp_peer_get() will return if there is a peer RDT | |
992 | * resource and the exact instance that shares the same hardware. | |
993 | * | |
994 | * Return: 0 if a CDP peer was found, <0 on error or if no CDP peer exists. | |
995 | * If a CDP peer was found, @r_cdp will point to the peer RDT resource | |
996 | * and @d_cdp will point to the peer RDT domain. | |
997 | */ | |
e5f3530c RC |
998 | static int rdt_cdp_peer_get(struct rdt_resource *r, struct rdt_domain *d, |
999 | struct rdt_resource **r_cdp, | |
1000 | struct rdt_domain **d_cdp) | |
521348b0 RC |
1001 | { |
1002 | struct rdt_resource *_r_cdp = NULL; | |
1003 | struct rdt_domain *_d_cdp = NULL; | |
1004 | int ret = 0; | |
1005 | ||
1006 | switch (r->rid) { | |
1007 | case RDT_RESOURCE_L3DATA: | |
1008 | _r_cdp = &rdt_resources_all[RDT_RESOURCE_L3CODE]; | |
1009 | break; | |
1010 | case RDT_RESOURCE_L3CODE: | |
1011 | _r_cdp = &rdt_resources_all[RDT_RESOURCE_L3DATA]; | |
1012 | break; | |
1013 | case RDT_RESOURCE_L2DATA: | |
1014 | _r_cdp = &rdt_resources_all[RDT_RESOURCE_L2CODE]; | |
1015 | break; | |
1016 | case RDT_RESOURCE_L2CODE: | |
1017 | _r_cdp = &rdt_resources_all[RDT_RESOURCE_L2DATA]; | |
1018 | break; | |
1019 | default: | |
1020 | ret = -ENOENT; | |
1021 | goto out; | |
1022 | } | |
1023 | ||
1024 | /* | |
1025 | * When a new CPU comes online and CDP is enabled then the new | |
1026 | * RDT domains (if any) associated with both CDP RDT resources | |
1027 | * are added in the same CPU online routine while the | |
1028 | * rdtgroup_mutex is held. It should thus not happen for one | |
1029 | * RDT domain to exist and be associated with its RDT CDP | |
1030 | * resource but there is no RDT domain associated with the | |
1031 | * peer RDT CDP resource. Hence the WARN. | |
1032 | */ | |
1033 | _d_cdp = rdt_find_domain(_r_cdp, d->id, NULL); | |
52eb7433 | 1034 | if (WARN_ON(IS_ERR_OR_NULL(_d_cdp))) { |
521348b0 RC |
1035 | _r_cdp = NULL; |
1036 | ret = -EINVAL; | |
1037 | } | |
1038 | ||
1039 | out: | |
1040 | *r_cdp = _r_cdp; | |
1041 | *d_cdp = _d_cdp; | |
1042 | ||
1043 | return ret; | |
1044 | } | |
1045 | ||
49f7b4ef | 1046 | /** |
e5f3530c | 1047 | * __rdtgroup_cbm_overlaps - Does CBM for intended closid overlap with other |
49f7b4ef RC |
1048 | * @r: Resource to which domain instance @d belongs. |
1049 | * @d: The domain instance for which @closid is being tested. | |
1050 | * @cbm: Capacity bitmask being tested. | |
1051 | * @closid: Intended closid for @cbm. | |
1052 | * @exclusive: Only check if overlaps with exclusive resource groups | |
1053 | * | |
1054 | * Checks if provided @cbm intended to be used for @closid on domain | |
1055 | * @d overlaps with any other closids or other hardware usage associated | |
1056 | * with this domain. If @exclusive is true then only overlaps with | |
1057 | * resource groups in exclusive mode will be considered. If @exclusive | |
1058 | * is false then overlaps with any resource group or hardware entities | |
1059 | * will be considered. | |
1060 | * | |
49e00eee RC |
1061 | * @cbm is unsigned long, even if only 32 bits are used, to make the |
1062 | * bitmap functions work correctly. | |
1063 | * | |
49f7b4ef RC |
1064 | * Return: false if CBM does not overlap, true if it does. |
1065 | */ | |
e5f3530c RC |
1066 | static bool __rdtgroup_cbm_overlaps(struct rdt_resource *r, struct rdt_domain *d, |
1067 | unsigned long cbm, int closid, bool exclusive) | |
49f7b4ef | 1068 | { |
49f7b4ef | 1069 | enum rdtgrp_mode mode; |
49e00eee | 1070 | unsigned long ctrl_b; |
49f7b4ef RC |
1071 | u32 *ctrl; |
1072 | int i; | |
1073 | ||
1074 | /* Check for any overlap with regions used by hardware directly */ | |
1075 | if (!exclusive) { | |
49e00eee RC |
1076 | ctrl_b = r->cache.shareable_bits; |
1077 | if (bitmap_intersects(&cbm, &ctrl_b, r->cache.cbm_len)) | |
49f7b4ef RC |
1078 | return true; |
1079 | } | |
1080 | ||
1081 | /* Check for overlap with other resource groups */ | |
1082 | ctrl = d->ctrl_val; | |
f0df4e1a | 1083 | for (i = 0; i < closids_supported(); i++, ctrl++) { |
49e00eee | 1084 | ctrl_b = *ctrl; |
dfe9674b RC |
1085 | mode = rdtgroup_mode_by_closid(i); |
1086 | if (closid_allocated(i) && i != closid && | |
1087 | mode != RDT_MODE_PSEUDO_LOCKSETUP) { | |
49e00eee | 1088 | if (bitmap_intersects(&cbm, &ctrl_b, r->cache.cbm_len)) { |
49f7b4ef RC |
1089 | if (exclusive) { |
1090 | if (mode == RDT_MODE_EXCLUSIVE) | |
1091 | return true; | |
1092 | continue; | |
1093 | } | |
1094 | return true; | |
1095 | } | |
1096 | } | |
1097 | } | |
1098 | ||
1099 | return false; | |
1100 | } | |
1101 | ||
e5f3530c RC |
1102 | /** |
1103 | * rdtgroup_cbm_overlaps - Does CBM overlap with other use of hardware | |
1104 | * @r: Resource to which domain instance @d belongs. | |
1105 | * @d: The domain instance for which @closid is being tested. | |
1106 | * @cbm: Capacity bitmask being tested. | |
1107 | * @closid: Intended closid for @cbm. | |
1108 | * @exclusive: Only check if overlaps with exclusive resource groups | |
1109 | * | |
1110 | * Resources that can be allocated using a CBM can use the CBM to control | |
1111 | * the overlap of these allocations. rdtgroup_cmb_overlaps() is the test | |
1112 | * for overlap. Overlap test is not limited to the specific resource for | |
1113 | * which the CBM is intended though - when dealing with CDP resources that | |
1114 | * share the underlying hardware the overlap check should be performed on | |
1115 | * the CDP resource sharing the hardware also. | |
1116 | * | |
1117 | * Refer to description of __rdtgroup_cbm_overlaps() for the details of the | |
1118 | * overlap test. | |
1119 | * | |
1120 | * Return: true if CBM overlap detected, false if there is no overlap | |
1121 | */ | |
1122 | bool rdtgroup_cbm_overlaps(struct rdt_resource *r, struct rdt_domain *d, | |
1123 | unsigned long cbm, int closid, bool exclusive) | |
1124 | { | |
1125 | struct rdt_resource *r_cdp; | |
1126 | struct rdt_domain *d_cdp; | |
1127 | ||
1128 | if (__rdtgroup_cbm_overlaps(r, d, cbm, closid, exclusive)) | |
1129 | return true; | |
1130 | ||
1131 | if (rdt_cdp_peer_get(r, d, &r_cdp, &d_cdp) < 0) | |
1132 | return false; | |
1133 | ||
1134 | return __rdtgroup_cbm_overlaps(r_cdp, d_cdp, cbm, closid, exclusive); | |
1135 | } | |
1136 | ||
49f7b4ef RC |
1137 | /** |
1138 | * rdtgroup_mode_test_exclusive - Test if this resource group can be exclusive | |
1139 | * | |
1140 | * An exclusive resource group implies that there should be no sharing of | |
1141 | * its allocated resources. At the time this group is considered to be | |
1142 | * exclusive this test can determine if its current schemata supports this | |
1143 | * setting by testing for overlap with all other resource groups. | |
1144 | * | |
1145 | * Return: true if resource group can be exclusive, false if there is overlap | |
1146 | * with allocations of other resource groups and thus this resource group | |
1147 | * cannot be exclusive. | |
1148 | */ | |
1149 | static bool rdtgroup_mode_test_exclusive(struct rdtgroup *rdtgrp) | |
1150 | { | |
1151 | int closid = rdtgrp->closid; | |
1152 | struct rdt_resource *r; | |
939b90b2 | 1153 | bool has_cache = false; |
49f7b4ef RC |
1154 | struct rdt_domain *d; |
1155 | ||
1156 | for_each_alloc_enabled_rdt_resource(r) { | |
939b90b2 RC |
1157 | if (r->rid == RDT_RESOURCE_MBA) |
1158 | continue; | |
1159 | has_cache = true; | |
49f7b4ef RC |
1160 | list_for_each_entry(d, &r->domains, list) { |
1161 | if (rdtgroup_cbm_overlaps(r, d, d->ctrl_val[closid], | |
939b90b2 | 1162 | rdtgrp->closid, false)) { |
723f1a0d | 1163 | rdt_last_cmd_puts("Schemata overlaps\n"); |
49f7b4ef | 1164 | return false; |
939b90b2 | 1165 | } |
49f7b4ef RC |
1166 | } |
1167 | } | |
1168 | ||
939b90b2 | 1169 | if (!has_cache) { |
723f1a0d | 1170 | rdt_last_cmd_puts("Cannot be exclusive without CAT/CDP\n"); |
939b90b2 RC |
1171 | return false; |
1172 | } | |
1173 | ||
49f7b4ef RC |
1174 | return true; |
1175 | } | |
1176 | ||
1177 | /** | |
1178 | * rdtgroup_mode_write - Modify the resource group's mode | |
1179 | * | |
1180 | */ | |
d48d7a57 RC |
1181 | static ssize_t rdtgroup_mode_write(struct kernfs_open_file *of, |
1182 | char *buf, size_t nbytes, loff_t off) | |
1183 | { | |
1184 | struct rdtgroup *rdtgrp; | |
1185 | enum rdtgrp_mode mode; | |
1186 | int ret = 0; | |
1187 | ||
1188 | /* Valid input requires a trailing newline */ | |
1189 | if (nbytes == 0 || buf[nbytes - 1] != '\n') | |
1190 | return -EINVAL; | |
1191 | buf[nbytes - 1] = '\0'; | |
1192 | ||
1193 | rdtgrp = rdtgroup_kn_lock_live(of->kn); | |
1194 | if (!rdtgrp) { | |
1195 | rdtgroup_kn_unlock(of->kn); | |
1196 | return -ENOENT; | |
1197 | } | |
1198 | ||
1199 | rdt_last_cmd_clear(); | |
1200 | ||
1201 | mode = rdtgrp->mode; | |
1202 | ||
49f7b4ef | 1203 | if ((!strcmp(buf, "shareable") && mode == RDT_MODE_SHAREABLE) || |
dfe9674b RC |
1204 | (!strcmp(buf, "exclusive") && mode == RDT_MODE_EXCLUSIVE) || |
1205 | (!strcmp(buf, "pseudo-locksetup") && | |
1206 | mode == RDT_MODE_PSEUDO_LOCKSETUP) || | |
1207 | (!strcmp(buf, "pseudo-locked") && mode == RDT_MODE_PSEUDO_LOCKED)) | |
d48d7a57 RC |
1208 | goto out; |
1209 | ||
dfe9674b | 1210 | if (mode == RDT_MODE_PSEUDO_LOCKED) { |
45682489 | 1211 | rdt_last_cmd_puts("Cannot change pseudo-locked group\n"); |
dfe9674b RC |
1212 | ret = -EINVAL; |
1213 | goto out; | |
1214 | } | |
1215 | ||
d48d7a57 | 1216 | if (!strcmp(buf, "shareable")) { |
dfe9674b RC |
1217 | if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) { |
1218 | ret = rdtgroup_locksetup_exit(rdtgrp); | |
1219 | if (ret) | |
1220 | goto out; | |
1221 | } | |
d48d7a57 | 1222 | rdtgrp->mode = RDT_MODE_SHAREABLE; |
49f7b4ef RC |
1223 | } else if (!strcmp(buf, "exclusive")) { |
1224 | if (!rdtgroup_mode_test_exclusive(rdtgrp)) { | |
49f7b4ef RC |
1225 | ret = -EINVAL; |
1226 | goto out; | |
1227 | } | |
dfe9674b RC |
1228 | if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) { |
1229 | ret = rdtgroup_locksetup_exit(rdtgrp); | |
1230 | if (ret) | |
1231 | goto out; | |
1232 | } | |
49f7b4ef | 1233 | rdtgrp->mode = RDT_MODE_EXCLUSIVE; |
dfe9674b RC |
1234 | } else if (!strcmp(buf, "pseudo-locksetup")) { |
1235 | ret = rdtgroup_locksetup_enter(rdtgrp); | |
1236 | if (ret) | |
1237 | goto out; | |
1238 | rdtgrp->mode = RDT_MODE_PSEUDO_LOCKSETUP; | |
d48d7a57 | 1239 | } else { |
45682489 | 1240 | rdt_last_cmd_puts("Unknown or unsupported mode\n"); |
d48d7a57 RC |
1241 | ret = -EINVAL; |
1242 | } | |
1243 | ||
1244 | out: | |
1245 | rdtgroup_kn_unlock(of->kn); | |
1246 | return ret ?: nbytes; | |
1247 | } | |
1248 | ||
d9b48c86 RC |
1249 | /** |
1250 | * rdtgroup_cbm_to_size - Translate CBM to size in bytes | |
1251 | * @r: RDT resource to which @d belongs. | |
1252 | * @d: RDT domain instance. | |
1253 | * @cbm: bitmask for which the size should be computed. | |
1254 | * | |
1255 | * The bitmask provided associated with the RDT domain instance @d will be | |
1256 | * translated into how many bytes it represents. The size in bytes is | |
1257 | * computed by first dividing the total cache size by the CBM length to | |
1258 | * determine how many bytes each bit in the bitmask represents. The result | |
1259 | * is multiplied with the number of bits set in the bitmask. | |
49e00eee RC |
1260 | * |
1261 | * @cbm is unsigned long, even if only 32 bits are used to make the | |
1262 | * bitmap functions work correctly. | |
d9b48c86 RC |
1263 | */ |
1264 | unsigned int rdtgroup_cbm_to_size(struct rdt_resource *r, | |
49e00eee | 1265 | struct rdt_domain *d, unsigned long cbm) |
d9b48c86 RC |
1266 | { |
1267 | struct cpu_cacheinfo *ci; | |
1268 | unsigned int size = 0; | |
1269 | int num_b, i; | |
1270 | ||
49e00eee | 1271 | num_b = bitmap_weight(&cbm, r->cache.cbm_len); |
d9b48c86 RC |
1272 | ci = get_cpu_cacheinfo(cpumask_any(&d->cpu_mask)); |
1273 | for (i = 0; i < ci->num_leaves; i++) { | |
1274 | if (ci->info_list[i].level == r->cache_level) { | |
1275 | size = ci->info_list[i].size / r->cache.cbm_len * num_b; | |
1276 | break; | |
1277 | } | |
1278 | } | |
1279 | ||
1280 | return size; | |
1281 | } | |
1282 | ||
1283 | /** | |
1284 | * rdtgroup_size_show - Display size in bytes of allocated regions | |
1285 | * | |
1286 | * The "size" file mirrors the layout of the "schemata" file, printing the | |
1287 | * size in bytes of each region instead of the capacity bitmask. | |
1288 | * | |
1289 | */ | |
1290 | static int rdtgroup_size_show(struct kernfs_open_file *of, | |
1291 | struct seq_file *s, void *v) | |
1292 | { | |
1293 | struct rdtgroup *rdtgrp; | |
1294 | struct rdt_resource *r; | |
1295 | struct rdt_domain *d; | |
1296 | unsigned int size; | |
b61b8bba | 1297 | int ret = 0; |
f968dc11 RC |
1298 | bool sep; |
1299 | u32 ctrl; | |
d9b48c86 RC |
1300 | |
1301 | rdtgrp = rdtgroup_kn_lock_live(of->kn); | |
1302 | if (!rdtgrp) { | |
1303 | rdtgroup_kn_unlock(of->kn); | |
1304 | return -ENOENT; | |
1305 | } | |
1306 | ||
f4e80d67 | 1307 | if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) { |
b61b8bba JJ |
1308 | if (!rdtgrp->plr->d) { |
1309 | rdt_last_cmd_clear(); | |
1310 | rdt_last_cmd_puts("Cache domain offline\n"); | |
1311 | ret = -ENODEV; | |
1312 | } else { | |
1313 | seq_printf(s, "%*s:", max_name_width, | |
1314 | rdtgrp->plr->r->name); | |
1315 | size = rdtgroup_cbm_to_size(rdtgrp->plr->r, | |
1316 | rdtgrp->plr->d, | |
1317 | rdtgrp->plr->cbm); | |
1318 | seq_printf(s, "%d=%u\n", rdtgrp->plr->d->id, size); | |
1319 | } | |
f4e80d67 RC |
1320 | goto out; |
1321 | } | |
1322 | ||
d9b48c86 | 1323 | for_each_alloc_enabled_rdt_resource(r) { |
f968dc11 | 1324 | sep = false; |
d9b48c86 RC |
1325 | seq_printf(s, "%*s:", max_name_width, r->name); |
1326 | list_for_each_entry(d, &r->domains, list) { | |
1327 | if (sep) | |
1328 | seq_putc(s, ';'); | |
dfe9674b RC |
1329 | if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) { |
1330 | size = 0; | |
1331 | } else { | |
f968dc11 RC |
1332 | ctrl = (!is_mba_sc(r) ? |
1333 | d->ctrl_val[rdtgrp->closid] : | |
1334 | d->mbps_val[rdtgrp->closid]); | |
1335 | if (r->rid == RDT_RESOURCE_MBA) | |
1336 | size = ctrl; | |
1337 | else | |
1338 | size = rdtgroup_cbm_to_size(r, d, ctrl); | |
dfe9674b | 1339 | } |
d9b48c86 RC |
1340 | seq_printf(s, "%d=%u", d->id, size); |
1341 | sep = true; | |
1342 | } | |
1343 | seq_putc(s, '\n'); | |
1344 | } | |
1345 | ||
f4e80d67 | 1346 | out: |
d9b48c86 RC |
1347 | rdtgroup_kn_unlock(of->kn); |
1348 | ||
b61b8bba | 1349 | return ret; |
d9b48c86 RC |
1350 | } |
1351 | ||
4e978d06 | 1352 | /* rdtgroup information files for one cache resource. */ |
5dc1d5c6 | 1353 | static struct rftype res_common_files[] = { |
9b3a7fd0 TL |
1354 | { |
1355 | .name = "last_cmd_status", | |
1356 | .mode = 0444, | |
1357 | .kf_ops = &rdtgroup_kf_single_ops, | |
1358 | .seq_show = rdt_last_cmd_status_show, | |
1359 | .fflags = RF_TOP_INFO, | |
1360 | }, | |
4e978d06 FY |
1361 | { |
1362 | .name = "num_closids", | |
1363 | .mode = 0444, | |
1364 | .kf_ops = &rdtgroup_kf_single_ops, | |
1365 | .seq_show = rdt_num_closids_show, | |
5dc1d5c6 | 1366 | .fflags = RF_CTRL_INFO, |
4e978d06 | 1367 | }, |
d4ab3320 VS |
1368 | { |
1369 | .name = "mon_features", | |
1370 | .mode = 0444, | |
1371 | .kf_ops = &rdtgroup_kf_single_ops, | |
1372 | .seq_show = rdt_mon_features_show, | |
1373 | .fflags = RF_MON_INFO, | |
1374 | }, | |
1375 | { | |
1376 | .name = "num_rmids", | |
1377 | .mode = 0444, | |
1378 | .kf_ops = &rdtgroup_kf_single_ops, | |
1379 | .seq_show = rdt_num_rmids_show, | |
1380 | .fflags = RF_MON_INFO, | |
1381 | }, | |
4e978d06 FY |
1382 | { |
1383 | .name = "cbm_mask", | |
1384 | .mode = 0444, | |
1385 | .kf_ops = &rdtgroup_kf_single_ops, | |
2545e9f5 | 1386 | .seq_show = rdt_default_ctrl_show, |
5dc1d5c6 | 1387 | .fflags = RF_CTRL_INFO | RFTYPE_RES_CACHE, |
4e978d06 | 1388 | }, |
53a114a6 SL |
1389 | { |
1390 | .name = "min_cbm_bits", | |
1391 | .mode = 0444, | |
1392 | .kf_ops = &rdtgroup_kf_single_ops, | |
1393 | .seq_show = rdt_min_cbm_bits_show, | |
5dc1d5c6 | 1394 | .fflags = RF_CTRL_INFO | RFTYPE_RES_CACHE, |
db69ef65 | 1395 | }, |
0dd2d749 FY |
1396 | { |
1397 | .name = "shareable_bits", | |
1398 | .mode = 0444, | |
1399 | .kf_ops = &rdtgroup_kf_single_ops, | |
1400 | .seq_show = rdt_shareable_bits_show, | |
1401 | .fflags = RF_CTRL_INFO | RFTYPE_RES_CACHE, | |
1402 | }, | |
e6519011 RC |
1403 | { |
1404 | .name = "bit_usage", | |
1405 | .mode = 0444, | |
1406 | .kf_ops = &rdtgroup_kf_single_ops, | |
1407 | .seq_show = rdt_bit_usage_show, | |
1408 | .fflags = RF_CTRL_INFO | RFTYPE_RES_CACHE, | |
1409 | }, | |
db69ef65 VS |
1410 | { |
1411 | .name = "min_bandwidth", | |
1412 | .mode = 0444, | |
1413 | .kf_ops = &rdtgroup_kf_single_ops, | |
1414 | .seq_show = rdt_min_bw_show, | |
5dc1d5c6 | 1415 | .fflags = RF_CTRL_INFO | RFTYPE_RES_MB, |
db69ef65 VS |
1416 | }, |
1417 | { | |
1418 | .name = "bandwidth_gran", | |
1419 | .mode = 0444, | |
1420 | .kf_ops = &rdtgroup_kf_single_ops, | |
1421 | .seq_show = rdt_bw_gran_show, | |
5dc1d5c6 | 1422 | .fflags = RF_CTRL_INFO | RFTYPE_RES_MB, |
db69ef65 VS |
1423 | }, |
1424 | { | |
1425 | .name = "delay_linear", | |
1426 | .mode = 0444, | |
1427 | .kf_ops = &rdtgroup_kf_single_ops, | |
1428 | .seq_show = rdt_delay_linear_show, | |
5dc1d5c6 T |
1429 | .fflags = RF_CTRL_INFO | RFTYPE_RES_MB, |
1430 | }, | |
d4ab3320 VS |
1431 | { |
1432 | .name = "max_threshold_occupancy", | |
1433 | .mode = 0644, | |
1434 | .kf_ops = &rdtgroup_kf_single_ops, | |
1435 | .write = max_threshold_occ_write, | |
1436 | .seq_show = max_threshold_occ_show, | |
1437 | .fflags = RF_MON_INFO | RFTYPE_RES_CACHE, | |
1438 | }, | |
5dc1d5c6 T |
1439 | { |
1440 | .name = "cpus", | |
1441 | .mode = 0644, | |
1442 | .kf_ops = &rdtgroup_kf_single_ops, | |
1443 | .write = rdtgroup_cpus_write, | |
1444 | .seq_show = rdtgroup_cpus_show, | |
1445 | .fflags = RFTYPE_BASE, | |
1446 | }, | |
1447 | { | |
1448 | .name = "cpus_list", | |
1449 | .mode = 0644, | |
1450 | .kf_ops = &rdtgroup_kf_single_ops, | |
1451 | .write = rdtgroup_cpus_write, | |
1452 | .seq_show = rdtgroup_cpus_show, | |
1453 | .flags = RFTYPE_FLAGS_CPUS_LIST, | |
1454 | .fflags = RFTYPE_BASE, | |
1455 | }, | |
1456 | { | |
1457 | .name = "tasks", | |
1458 | .mode = 0644, | |
1459 | .kf_ops = &rdtgroup_kf_single_ops, | |
1460 | .write = rdtgroup_tasks_write, | |
1461 | .seq_show = rdtgroup_tasks_show, | |
1462 | .fflags = RFTYPE_BASE, | |
1463 | }, | |
1464 | { | |
1465 | .name = "schemata", | |
1466 | .mode = 0644, | |
1467 | .kf_ops = &rdtgroup_kf_single_ops, | |
1468 | .write = rdtgroup_schemata_write, | |
1469 | .seq_show = rdtgroup_schemata_show, | |
1470 | .fflags = RF_CTRL_BASE, | |
db69ef65 | 1471 | }, |
d48d7a57 RC |
1472 | { |
1473 | .name = "mode", | |
1474 | .mode = 0644, | |
1475 | .kf_ops = &rdtgroup_kf_single_ops, | |
1476 | .write = rdtgroup_mode_write, | |
1477 | .seq_show = rdtgroup_mode_show, | |
1478 | .fflags = RF_CTRL_BASE, | |
1479 | }, | |
d9b48c86 RC |
1480 | { |
1481 | .name = "size", | |
1482 | .mode = 0444, | |
1483 | .kf_ops = &rdtgroup_kf_single_ops, | |
1484 | .seq_show = rdtgroup_size_show, | |
1485 | .fflags = RF_CTRL_BASE, | |
1486 | }, | |
1487 | ||
db69ef65 VS |
1488 | }; |
1489 | ||
5dc1d5c6 | 1490 | static int rdtgroup_add_files(struct kernfs_node *kn, unsigned long fflags) |
db69ef65 | 1491 | { |
5dc1d5c6 T |
1492 | struct rftype *rfts, *rft; |
1493 | int ret, len; | |
1494 | ||
1495 | rfts = res_common_files; | |
1496 | len = ARRAY_SIZE(res_common_files); | |
1497 | ||
1498 | lockdep_assert_held(&rdtgroup_mutex); | |
1499 | ||
1500 | for (rft = rfts; rft < rfts + len; rft++) { | |
1501 | if ((fflags & rft->fflags) == rft->fflags) { | |
1502 | ret = rdtgroup_add_file(kn, rft); | |
1503 | if (ret) | |
1504 | goto error; | |
1505 | } | |
1506 | } | |
1507 | ||
1508 | return 0; | |
1509 | error: | |
1510 | pr_warn("Failed to add %s, err=%d\n", rft->name, ret); | |
1511 | while (--rft >= rfts) { | |
1512 | if ((fflags & rft->fflags) == rft->fflags) | |
1513 | kernfs_remove_by_name(kn, rft->name); | |
1514 | } | |
1515 | return ret; | |
db69ef65 VS |
1516 | } |
1517 | ||
125db711 RC |
1518 | /** |
1519 | * rdtgroup_kn_mode_restrict - Restrict user access to named resctrl file | |
1520 | * @r: The resource group with which the file is associated. | |
1521 | * @name: Name of the file | |
1522 | * | |
1523 | * The permissions of named resctrl file, directory, or link are modified | |
1524 | * to not allow read, write, or execute by any user. | |
1525 | * | |
1526 | * WARNING: This function is intended to communicate to the user that the | |
1527 | * resctrl file has been locked down - that it is not relevant to the | |
1528 | * particular state the system finds itself in. It should not be relied | |
1529 | * on to protect from user access because after the file's permissions | |
1530 | * are restricted the user can still change the permissions using chmod | |
1531 | * from the command line. | |
1532 | * | |
1533 | * Return: 0 on success, <0 on failure. | |
1534 | */ | |
1535 | int rdtgroup_kn_mode_restrict(struct rdtgroup *r, const char *name) | |
1536 | { | |
1537 | struct iattr iattr = {.ia_valid = ATTR_MODE,}; | |
1538 | struct kernfs_node *kn; | |
1539 | int ret = 0; | |
1540 | ||
1541 | kn = kernfs_find_and_get_ns(r->kn, name, NULL); | |
1542 | if (!kn) | |
1543 | return -ENOENT; | |
1544 | ||
1545 | switch (kernfs_type(kn)) { | |
1546 | case KERNFS_DIR: | |
1547 | iattr.ia_mode = S_IFDIR; | |
1548 | break; | |
1549 | case KERNFS_FILE: | |
1550 | iattr.ia_mode = S_IFREG; | |
1551 | break; | |
1552 | case KERNFS_LINK: | |
1553 | iattr.ia_mode = S_IFLNK; | |
1554 | break; | |
1555 | } | |
1556 | ||
1557 | ret = kernfs_setattr(kn, &iattr); | |
1558 | kernfs_put(kn); | |
1559 | return ret; | |
1560 | } | |
1561 | ||
1562 | /** | |
1563 | * rdtgroup_kn_mode_restore - Restore user access to named resctrl file | |
1564 | * @r: The resource group with which the file is associated. | |
1565 | * @name: Name of the file | |
392487de | 1566 | * @mask: Mask of permissions that should be restored |
125db711 RC |
1567 | * |
1568 | * Restore the permissions of the named file. If @name is a directory the | |
1569 | * permissions of its parent will be used. | |
1570 | * | |
1571 | * Return: 0 on success, <0 on failure. | |
1572 | */ | |
392487de RC |
1573 | int rdtgroup_kn_mode_restore(struct rdtgroup *r, const char *name, |
1574 | umode_t mask) | |
125db711 RC |
1575 | { |
1576 | struct iattr iattr = {.ia_valid = ATTR_MODE,}; | |
1577 | struct kernfs_node *kn, *parent; | |
1578 | struct rftype *rfts, *rft; | |
1579 | int ret, len; | |
1580 | ||
1581 | rfts = res_common_files; | |
1582 | len = ARRAY_SIZE(res_common_files); | |
1583 | ||
1584 | for (rft = rfts; rft < rfts + len; rft++) { | |
1585 | if (!strcmp(rft->name, name)) | |
392487de | 1586 | iattr.ia_mode = rft->mode & mask; |
125db711 RC |
1587 | } |
1588 | ||
1589 | kn = kernfs_find_and_get_ns(r->kn, name, NULL); | |
1590 | if (!kn) | |
1591 | return -ENOENT; | |
1592 | ||
1593 | switch (kernfs_type(kn)) { | |
1594 | case KERNFS_DIR: | |
1595 | parent = kernfs_get_parent(kn); | |
1596 | if (parent) { | |
1597 | iattr.ia_mode |= parent->mode; | |
1598 | kernfs_put(parent); | |
1599 | } | |
1600 | iattr.ia_mode |= S_IFDIR; | |
1601 | break; | |
1602 | case KERNFS_FILE: | |
1603 | iattr.ia_mode |= S_IFREG; | |
1604 | break; | |
1605 | case KERNFS_LINK: | |
1606 | iattr.ia_mode |= S_IFLNK; | |
1607 | break; | |
1608 | } | |
1609 | ||
1610 | ret = kernfs_setattr(kn, &iattr); | |
1611 | kernfs_put(kn); | |
1612 | return ret; | |
1613 | } | |
1614 | ||
5dc1d5c6 T |
1615 | static int rdtgroup_mkdir_info_resdir(struct rdt_resource *r, char *name, |
1616 | unsigned long fflags) | |
6a507a6a | 1617 | { |
5dc1d5c6 T |
1618 | struct kernfs_node *kn_subdir; |
1619 | int ret; | |
1620 | ||
1621 | kn_subdir = kernfs_create_dir(kn_info, name, | |
1622 | kn_info->mode, r); | |
1623 | if (IS_ERR(kn_subdir)) | |
1624 | return PTR_ERR(kn_subdir); | |
1625 | ||
1626 | kernfs_get(kn_subdir); | |
1627 | ret = rdtgroup_kn_set_ugid(kn_subdir); | |
1628 | if (ret) | |
1629 | return ret; | |
1630 | ||
1631 | ret = rdtgroup_add_files(kn_subdir, fflags); | |
1632 | if (!ret) | |
1633 | kernfs_activate(kn_subdir); | |
1634 | ||
1635 | return ret; | |
6a507a6a VS |
1636 | } |
1637 | ||
4e978d06 FY |
1638 | static int rdtgroup_create_info_dir(struct kernfs_node *parent_kn) |
1639 | { | |
4e978d06 | 1640 | struct rdt_resource *r; |
5dc1d5c6 | 1641 | unsigned long fflags; |
d4ab3320 | 1642 | char name[32]; |
5dc1d5c6 | 1643 | int ret; |
4e978d06 FY |
1644 | |
1645 | /* create the directory */ | |
1646 | kn_info = kernfs_create_dir(parent_kn, "info", parent_kn->mode, NULL); | |
1647 | if (IS_ERR(kn_info)) | |
1648 | return PTR_ERR(kn_info); | |
1649 | kernfs_get(kn_info); | |
1650 | ||
9b3a7fd0 TL |
1651 | ret = rdtgroup_add_files(kn_info, RF_TOP_INFO); |
1652 | if (ret) | |
1653 | goto out_destroy; | |
1654 | ||
1b5c0b75 | 1655 | for_each_alloc_enabled_rdt_resource(r) { |
5dc1d5c6 T |
1656 | fflags = r->fflags | RF_CTRL_INFO; |
1657 | ret = rdtgroup_mkdir_info_resdir(r, r->name, fflags); | |
4e978d06 FY |
1658 | if (ret) |
1659 | goto out_destroy; | |
4e978d06 | 1660 | } |
d4ab3320 VS |
1661 | |
1662 | for_each_mon_enabled_rdt_resource(r) { | |
1663 | fflags = r->fflags | RF_MON_INFO; | |
1664 | sprintf(name, "%s_MON", r->name); | |
1665 | ret = rdtgroup_mkdir_info_resdir(r, name, fflags); | |
1666 | if (ret) | |
1667 | goto out_destroy; | |
1668 | } | |
1669 | ||
4e978d06 FY |
1670 | /* |
1671 | * This extra ref will be put in kernfs_remove() and guarantees | |
1672 | * that @rdtgrp->kn is always accessible. | |
1673 | */ | |
1674 | kernfs_get(kn_info); | |
1675 | ||
1676 | ret = rdtgroup_kn_set_ugid(kn_info); | |
1677 | if (ret) | |
1678 | goto out_destroy; | |
1679 | ||
1680 | kernfs_activate(kn_info); | |
1681 | ||
1682 | return 0; | |
1683 | ||
1684 | out_destroy: | |
1685 | kernfs_remove(kn_info); | |
1686 | return ret; | |
1687 | } | |
1688 | ||
c7d9aac6 VS |
1689 | static int |
1690 | mongroup_create_dir(struct kernfs_node *parent_kn, struct rdtgroup *prgrp, | |
1691 | char *name, struct kernfs_node **dest_kn) | |
1692 | { | |
1693 | struct kernfs_node *kn; | |
1694 | int ret; | |
1695 | ||
1696 | /* create the directory */ | |
1697 | kn = kernfs_create_dir(parent_kn, name, parent_kn->mode, prgrp); | |
1698 | if (IS_ERR(kn)) | |
1699 | return PTR_ERR(kn); | |
1700 | ||
1701 | if (dest_kn) | |
1702 | *dest_kn = kn; | |
1703 | ||
1704 | /* | |
1705 | * This extra ref will be put in kernfs_remove() and guarantees | |
1706 | * that @rdtgrp->kn is always accessible. | |
1707 | */ | |
1708 | kernfs_get(kn); | |
1709 | ||
1710 | ret = rdtgroup_kn_set_ugid(kn); | |
1711 | if (ret) | |
1712 | goto out_destroy; | |
1713 | ||
1714 | kernfs_activate(kn); | |
1715 | ||
1716 | return 0; | |
1717 | ||
1718 | out_destroy: | |
1719 | kernfs_remove(kn); | |
1720 | return ret; | |
1721 | } | |
99adde9b | 1722 | |
5ff193fb FY |
1723 | static void l3_qos_cfg_update(void *arg) |
1724 | { | |
1725 | bool *enable = arg; | |
1726 | ||
aa50453a | 1727 | wrmsrl(MSR_IA32_L3_QOS_CFG, *enable ? L3_QOS_CDP_ENABLE : 0ULL); |
5ff193fb FY |
1728 | } |
1729 | ||
99adde9b | 1730 | static void l2_qos_cfg_update(void *arg) |
5ff193fb | 1731 | { |
99adde9b FY |
1732 | bool *enable = arg; |
1733 | ||
aa50453a | 1734 | wrmsrl(MSR_IA32_L2_QOS_CFG, *enable ? L2_QOS_CDP_ENABLE : 0ULL); |
99adde9b FY |
1735 | } |
1736 | ||
19c635ab VS |
1737 | static inline bool is_mba_linear(void) |
1738 | { | |
1739 | return rdt_resources_all[RDT_RESOURCE_MBA].membw.delay_linear; | |
1740 | } | |
1741 | ||
99adde9b FY |
1742 | static int set_cache_qos_cfg(int level, bool enable) |
1743 | { | |
1744 | void (*update)(void *arg); | |
1745 | struct rdt_resource *r_l; | |
5ff193fb FY |
1746 | cpumask_var_t cpu_mask; |
1747 | struct rdt_domain *d; | |
1748 | int cpu; | |
1749 | ||
1750 | if (!zalloc_cpumask_var(&cpu_mask, GFP_KERNEL)) | |
1751 | return -ENOMEM; | |
1752 | ||
99adde9b FY |
1753 | if (level == RDT_RESOURCE_L3) |
1754 | update = l3_qos_cfg_update; | |
1755 | else if (level == RDT_RESOURCE_L2) | |
1756 | update = l2_qos_cfg_update; | |
1757 | else | |
1758 | return -EINVAL; | |
1759 | ||
1760 | r_l = &rdt_resources_all[level]; | |
1761 | list_for_each_entry(d, &r_l->domains, list) { | |
5ff193fb FY |
1762 | /* Pick one CPU from each domain instance to update MSR */ |
1763 | cpumask_set_cpu(cpumask_any(&d->cpu_mask), cpu_mask); | |
1764 | } | |
1765 | cpu = get_cpu(); | |
1766 | /* Update QOS_CFG MSR on this cpu if it's in cpu_mask. */ | |
1767 | if (cpumask_test_cpu(cpu, cpu_mask)) | |
99adde9b | 1768 | update(&enable); |
5ff193fb | 1769 | /* Update QOS_CFG MSR on all other cpus in cpu_mask. */ |
99adde9b | 1770 | smp_call_function_many(cpu_mask, update, &enable, 1); |
5ff193fb FY |
1771 | put_cpu(); |
1772 | ||
1773 | free_cpumask_var(cpu_mask); | |
1774 | ||
1775 | return 0; | |
1776 | } | |
1777 | ||
19c635ab VS |
1778 | /* |
1779 | * Enable or disable the MBA software controller | |
1780 | * which helps user specify bandwidth in MBps. | |
1781 | * MBA software controller is supported only if | |
1782 | * MBM is supported and MBA is in linear scale. | |
1783 | */ | |
1784 | static int set_mba_sc(bool mba_sc) | |
1785 | { | |
1786 | struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_MBA]; | |
1bd2a63b | 1787 | struct rdt_domain *d; |
19c635ab VS |
1788 | |
1789 | if (!is_mbm_enabled() || !is_mba_linear() || | |
1790 | mba_sc == is_mba_sc(r)) | |
1791 | return -EINVAL; | |
1792 | ||
1793 | r->membw.mba_sc = mba_sc; | |
1bd2a63b VS |
1794 | list_for_each_entry(d, &r->domains, list) |
1795 | setup_default_ctrlval(r, d->ctrl_val, d->mbps_val); | |
19c635ab VS |
1796 | |
1797 | return 0; | |
1798 | } | |
1799 | ||
99adde9b | 1800 | static int cdp_enable(int level, int data_type, int code_type) |
5ff193fb | 1801 | { |
99adde9b FY |
1802 | struct rdt_resource *r_ldata = &rdt_resources_all[data_type]; |
1803 | struct rdt_resource *r_lcode = &rdt_resources_all[code_type]; | |
1804 | struct rdt_resource *r_l = &rdt_resources_all[level]; | |
5ff193fb FY |
1805 | int ret; |
1806 | ||
99adde9b FY |
1807 | if (!r_l->alloc_capable || !r_ldata->alloc_capable || |
1808 | !r_lcode->alloc_capable) | |
5ff193fb FY |
1809 | return -EINVAL; |
1810 | ||
99adde9b | 1811 | ret = set_cache_qos_cfg(level, true); |
5ff193fb | 1812 | if (!ret) { |
99adde9b FY |
1813 | r_l->alloc_enabled = false; |
1814 | r_ldata->alloc_enabled = true; | |
1815 | r_lcode->alloc_enabled = true; | |
5ff193fb FY |
1816 | } |
1817 | return ret; | |
1818 | } | |
1819 | ||
99adde9b FY |
1820 | static int cdpl3_enable(void) |
1821 | { | |
1822 | return cdp_enable(RDT_RESOURCE_L3, RDT_RESOURCE_L3DATA, | |
1823 | RDT_RESOURCE_L3CODE); | |
1824 | } | |
1825 | ||
1826 | static int cdpl2_enable(void) | |
5ff193fb | 1827 | { |
99adde9b FY |
1828 | return cdp_enable(RDT_RESOURCE_L2, RDT_RESOURCE_L2DATA, |
1829 | RDT_RESOURCE_L2CODE); | |
1830 | } | |
1831 | ||
1832 | static void cdp_disable(int level, int data_type, int code_type) | |
1833 | { | |
1834 | struct rdt_resource *r = &rdt_resources_all[level]; | |
5ff193fb | 1835 | |
1b5c0b75 | 1836 | r->alloc_enabled = r->alloc_capable; |
5ff193fb | 1837 | |
99adde9b FY |
1838 | if (rdt_resources_all[data_type].alloc_enabled) { |
1839 | rdt_resources_all[data_type].alloc_enabled = false; | |
1840 | rdt_resources_all[code_type].alloc_enabled = false; | |
1841 | set_cache_qos_cfg(level, false); | |
5ff193fb FY |
1842 | } |
1843 | } | |
1844 | ||
99adde9b FY |
1845 | static void cdpl3_disable(void) |
1846 | { | |
1847 | cdp_disable(RDT_RESOURCE_L3, RDT_RESOURCE_L3DATA, RDT_RESOURCE_L3CODE); | |
1848 | } | |
1849 | ||
1850 | static void cdpl2_disable(void) | |
1851 | { | |
1852 | cdp_disable(RDT_RESOURCE_L2, RDT_RESOURCE_L2DATA, RDT_RESOURCE_L2CODE); | |
1853 | } | |
1854 | ||
1855 | static void cdp_disable_all(void) | |
1856 | { | |
1857 | if (rdt_resources_all[RDT_RESOURCE_L3DATA].alloc_enabled) | |
1858 | cdpl3_disable(); | |
1859 | if (rdt_resources_all[RDT_RESOURCE_L2DATA].alloc_enabled) | |
1860 | cdpl2_disable(); | |
1861 | } | |
1862 | ||
60cf5e10 FY |
1863 | /* |
1864 | * We don't allow rdtgroup directories to be created anywhere | |
1865 | * except the root directory. Thus when looking for the rdtgroup | |
1866 | * structure for a kernfs node we are either looking at a directory, | |
1867 | * in which case the rdtgroup structure is pointed at by the "priv" | |
1868 | * field, otherwise we have a file, and need only look to the parent | |
1869 | * to find the rdtgroup. | |
1870 | */ | |
1871 | static struct rdtgroup *kernfs_to_rdtgroup(struct kernfs_node *kn) | |
1872 | { | |
f57b3087 FY |
1873 | if (kernfs_type(kn) == KERNFS_DIR) { |
1874 | /* | |
1875 | * All the resource directories use "kn->priv" | |
1876 | * to point to the "struct rdtgroup" for the | |
1877 | * resource. "info" and its subdirectories don't | |
1878 | * have rdtgroup structures, so return NULL here. | |
1879 | */ | |
1880 | if (kn == kn_info || kn->parent == kn_info) | |
1881 | return NULL; | |
1882 | else | |
1883 | return kn->priv; | |
1884 | } else { | |
60cf5e10 | 1885 | return kn->parent->priv; |
f57b3087 | 1886 | } |
60cf5e10 FY |
1887 | } |
1888 | ||
1889 | struct rdtgroup *rdtgroup_kn_lock_live(struct kernfs_node *kn) | |
1890 | { | |
1891 | struct rdtgroup *rdtgrp = kernfs_to_rdtgroup(kn); | |
1892 | ||
f57b3087 FY |
1893 | if (!rdtgrp) |
1894 | return NULL; | |
1895 | ||
60cf5e10 FY |
1896 | atomic_inc(&rdtgrp->waitcount); |
1897 | kernfs_break_active_protection(kn); | |
1898 | ||
1899 | mutex_lock(&rdtgroup_mutex); | |
1900 | ||
1901 | /* Was this group deleted while we waited? */ | |
1902 | if (rdtgrp->flags & RDT_DELETED) | |
1903 | return NULL; | |
1904 | ||
1905 | return rdtgrp; | |
1906 | } | |
1907 | ||
1908 | void rdtgroup_kn_unlock(struct kernfs_node *kn) | |
1909 | { | |
1910 | struct rdtgroup *rdtgrp = kernfs_to_rdtgroup(kn); | |
1911 | ||
f57b3087 FY |
1912 | if (!rdtgrp) |
1913 | return; | |
1914 | ||
60cf5e10 FY |
1915 | mutex_unlock(&rdtgroup_mutex); |
1916 | ||
1917 | if (atomic_dec_and_test(&rdtgrp->waitcount) && | |
1918 | (rdtgrp->flags & RDT_DELETED)) { | |
e0bdfe8e RC |
1919 | if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP || |
1920 | rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) | |
1921 | rdtgroup_pseudo_lock_remove(rdtgrp); | |
60cf5e10 | 1922 | kernfs_unbreak_active_protection(kn); |
49ec8f5b | 1923 | kernfs_put(rdtgrp->kn); |
60cf5e10 FY |
1924 | kfree(rdtgrp); |
1925 | } else { | |
1926 | kernfs_unbreak_active_protection(kn); | |
1927 | } | |
1928 | } | |
1929 | ||
4af4a88e VS |
1930 | static int mkdir_mondata_all(struct kernfs_node *parent_kn, |
1931 | struct rdtgroup *prgrp, | |
1932 | struct kernfs_node **mon_data_kn); | |
1933 | ||
23bf1b6b | 1934 | static int rdt_enable_ctx(struct rdt_fs_context *ctx) |
5ff193fb | 1935 | { |
23bf1b6b DH |
1936 | int ret = 0; |
1937 | ||
1938 | if (ctx->enable_cdpl2) | |
1939 | ret = cdpl2_enable(); | |
1940 | ||
1941 | if (!ret && ctx->enable_cdpl3) | |
1942 | ret = cdpl3_enable(); | |
1943 | ||
1944 | if (!ret && ctx->enable_mba_mbps) | |
1945 | ret = set_mba_sc(true); | |
1946 | ||
1947 | return ret; | |
1948 | } | |
1949 | ||
1950 | static int rdt_get_tree(struct fs_context *fc) | |
1951 | { | |
1952 | struct rdt_fs_context *ctx = rdt_fc2context(fc); | |
e3302683 VS |
1953 | struct rdt_domain *dom; |
1954 | struct rdt_resource *r; | |
5ff193fb FY |
1955 | int ret; |
1956 | ||
87943db7 | 1957 | cpus_read_lock(); |
5ff193fb FY |
1958 | mutex_lock(&rdtgroup_mutex); |
1959 | /* | |
1960 | * resctrl file system can only be mounted once. | |
1961 | */ | |
4af4a88e | 1962 | if (static_branch_unlikely(&rdt_enable_key)) { |
23bf1b6b | 1963 | ret = -EBUSY; |
5ff193fb FY |
1964 | goto out; |
1965 | } | |
1966 | ||
23bf1b6b DH |
1967 | ret = rdt_enable_ctx(ctx); |
1968 | if (ret < 0) | |
5ff193fb | 1969 | goto out_cdp; |
5ff193fb | 1970 | |
60cf5e10 FY |
1971 | closid_init(); |
1972 | ||
4e978d06 | 1973 | ret = rdtgroup_create_info_dir(rdtgroup_default.kn); |
23bf1b6b DH |
1974 | if (ret < 0) |
1975 | goto out_mba; | |
4e978d06 | 1976 | |
4af4a88e VS |
1977 | if (rdt_mon_capable) { |
1978 | ret = mongroup_create_dir(rdtgroup_default.kn, | |
1979 | NULL, "mon_groups", | |
1980 | &kn_mongrp); | |
23bf1b6b | 1981 | if (ret < 0) |
4af4a88e | 1982 | goto out_info; |
4af4a88e VS |
1983 | kernfs_get(kn_mongrp); |
1984 | ||
1985 | ret = mkdir_mondata_all(rdtgroup_default.kn, | |
1986 | &rdtgroup_default, &kn_mondata); | |
23bf1b6b | 1987 | if (ret < 0) |
4af4a88e | 1988 | goto out_mongrp; |
4af4a88e VS |
1989 | kernfs_get(kn_mondata); |
1990 | rdtgroup_default.mon.mon_data_kn = kn_mondata; | |
1991 | } | |
1992 | ||
32206ab3 | 1993 | ret = rdt_pseudo_lock_init(); |
23bf1b6b | 1994 | if (ret) |
32206ab3 | 1995 | goto out_mondata; |
32206ab3 | 1996 | |
23bf1b6b DH |
1997 | ret = kernfs_get_tree(fc); |
1998 | if (ret < 0) | |
32206ab3 | 1999 | goto out_psl; |
4af4a88e VS |
2000 | |
2001 | if (rdt_alloc_capable) | |
87943db7 | 2002 | static_branch_enable_cpuslocked(&rdt_alloc_enable_key); |
4af4a88e | 2003 | if (rdt_mon_capable) |
87943db7 | 2004 | static_branch_enable_cpuslocked(&rdt_mon_enable_key); |
5ff193fb | 2005 | |
4af4a88e | 2006 | if (rdt_alloc_capable || rdt_mon_capable) |
87943db7 | 2007 | static_branch_enable_cpuslocked(&rdt_enable_key); |
e3302683 VS |
2008 | |
2009 | if (is_mbm_enabled()) { | |
2010 | r = &rdt_resources_all[RDT_RESOURCE_L3]; | |
2011 | list_for_each_entry(dom, &r->domains, list) | |
bbc4615e | 2012 | mbm_setup_overflow_handler(dom, MBM_OVERFLOW_INTERVAL); |
e3302683 VS |
2013 | } |
2014 | ||
5ff193fb FY |
2015 | goto out; |
2016 | ||
32206ab3 RC |
2017 | out_psl: |
2018 | rdt_pseudo_lock_release(); | |
4af4a88e VS |
2019 | out_mondata: |
2020 | if (rdt_mon_capable) | |
2021 | kernfs_remove(kn_mondata); | |
2022 | out_mongrp: | |
2023 | if (rdt_mon_capable) | |
2024 | kernfs_remove(kn_mongrp); | |
2025 | out_info: | |
79298acc | 2026 | kernfs_remove(kn_info); |
23bf1b6b DH |
2027 | out_mba: |
2028 | if (ctx->enable_mba_mbps) | |
2029 | set_mba_sc(false); | |
5ff193fb | 2030 | out_cdp: |
99adde9b | 2031 | cdp_disable_all(); |
5ff193fb | 2032 | out: |
9b3a7fd0 | 2033 | rdt_last_cmd_clear(); |
5ff193fb | 2034 | mutex_unlock(&rdtgroup_mutex); |
87943db7 | 2035 | cpus_read_unlock(); |
23bf1b6b DH |
2036 | return ret; |
2037 | } | |
2038 | ||
2039 | enum rdt_param { | |
2040 | Opt_cdp, | |
2041 | Opt_cdpl2, | |
2042 | Opt_mba_mpbs, | |
2043 | nr__rdt_params | |
2044 | }; | |
2045 | ||
2046 | static const struct fs_parameter_spec rdt_param_specs[] = { | |
2047 | fsparam_flag("cdp", Opt_cdp), | |
2048 | fsparam_flag("cdpl2", Opt_cdpl2), | |
2049 | fsparam_flag("mba_mpbs", Opt_mba_mpbs), | |
2050 | {} | |
2051 | }; | |
2052 | ||
2053 | static const struct fs_parameter_description rdt_fs_parameters = { | |
2054 | .name = "rdt", | |
2055 | .specs = rdt_param_specs, | |
2056 | }; | |
2057 | ||
2058 | static int rdt_parse_param(struct fs_context *fc, struct fs_parameter *param) | |
2059 | { | |
2060 | struct rdt_fs_context *ctx = rdt_fc2context(fc); | |
2061 | struct fs_parse_result result; | |
2062 | int opt; | |
2063 | ||
2064 | opt = fs_parse(fc, &rdt_fs_parameters, param, &result); | |
2065 | if (opt < 0) | |
2066 | return opt; | |
2067 | ||
2068 | switch (opt) { | |
2069 | case Opt_cdp: | |
2070 | ctx->enable_cdpl3 = true; | |
2071 | return 0; | |
2072 | case Opt_cdpl2: | |
2073 | ctx->enable_cdpl2 = true; | |
2074 | return 0; | |
2075 | case Opt_mba_mpbs: | |
2076 | if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL) | |
2077 | return -EINVAL; | |
2078 | ctx->enable_mba_mbps = true; | |
2079 | return 0; | |
2080 | } | |
2081 | ||
2082 | return -EINVAL; | |
2083 | } | |
2084 | ||
2085 | static void rdt_fs_context_free(struct fs_context *fc) | |
2086 | { | |
2087 | struct rdt_fs_context *ctx = rdt_fc2context(fc); | |
5ff193fb | 2088 | |
23bf1b6b DH |
2089 | kernfs_free_fs_context(fc); |
2090 | kfree(ctx); | |
2091 | } | |
2092 | ||
2093 | static const struct fs_context_operations rdt_fs_context_ops = { | |
2094 | .free = rdt_fs_context_free, | |
2095 | .parse_param = rdt_parse_param, | |
2096 | .get_tree = rdt_get_tree, | |
2097 | }; | |
2098 | ||
2099 | static int rdt_init_fs_context(struct fs_context *fc) | |
2100 | { | |
2101 | struct rdt_fs_context *ctx; | |
2102 | ||
2103 | ctx = kzalloc(sizeof(struct rdt_fs_context), GFP_KERNEL); | |
2104 | if (!ctx) | |
2105 | return -ENOMEM; | |
2106 | ||
2107 | ctx->kfc.root = rdt_root; | |
2108 | ctx->kfc.magic = RDTGROUP_SUPER_MAGIC; | |
2109 | fc->fs_private = &ctx->kfc; | |
2110 | fc->ops = &rdt_fs_context_ops; | |
2111 | if (fc->user_ns) | |
2112 | put_user_ns(fc->user_ns); | |
2113 | fc->user_ns = get_user_ns(&init_user_ns); | |
2114 | fc->global = true; | |
2115 | return 0; | |
5ff193fb FY |
2116 | } |
2117 | ||
2545e9f5 | 2118 | static int reset_all_ctrls(struct rdt_resource *r) |
5ff193fb FY |
2119 | { |
2120 | struct msr_param msr_param; | |
2121 | cpumask_var_t cpu_mask; | |
2122 | struct rdt_domain *d; | |
2123 | int i, cpu; | |
2124 | ||
2125 | if (!zalloc_cpumask_var(&cpu_mask, GFP_KERNEL)) | |
2126 | return -ENOMEM; | |
2127 | ||
2128 | msr_param.res = r; | |
2129 | msr_param.low = 0; | |
2130 | msr_param.high = r->num_closid; | |
2131 | ||
2132 | /* | |
2133 | * Disable resource control for this resource by setting all | |
2134 | * CBMs in all domains to the maximum mask value. Pick one CPU | |
2135 | * from each domain to update the MSRs below. | |
2136 | */ | |
2137 | list_for_each_entry(d, &r->domains, list) { | |
2138 | cpumask_set_cpu(cpumask_any(&d->cpu_mask), cpu_mask); | |
2139 | ||
2140 | for (i = 0; i < r->num_closid; i++) | |
2545e9f5 | 2141 | d->ctrl_val[i] = r->default_ctrl; |
5ff193fb FY |
2142 | } |
2143 | cpu = get_cpu(); | |
2144 | /* Update CBM on this cpu if it's in cpu_mask. */ | |
2145 | if (cpumask_test_cpu(cpu, cpu_mask)) | |
2545e9f5 | 2146 | rdt_ctrl_update(&msr_param); |
5ff193fb | 2147 | /* Update CBM on all other cpus in cpu_mask. */ |
2545e9f5 | 2148 | smp_call_function_many(cpu_mask, rdt_ctrl_update, &msr_param, 1); |
5ff193fb FY |
2149 | put_cpu(); |
2150 | ||
2151 | free_cpumask_var(cpu_mask); | |
2152 | ||
2153 | return 0; | |
2154 | } | |
2155 | ||
f3cbeaca VS |
2156 | static bool is_closid_match(struct task_struct *t, struct rdtgroup *r) |
2157 | { | |
2158 | return (rdt_alloc_capable && | |
2159 | (r->type == RDTCTRL_GROUP) && (t->closid == r->closid)); | |
2160 | } | |
2161 | ||
2162 | static bool is_rmid_match(struct task_struct *t, struct rdtgroup *r) | |
2163 | { | |
2164 | return (rdt_mon_capable && | |
2165 | (r->type == RDTMON_GROUP) && (t->rmid == r->mon.rmid)); | |
2166 | } | |
2167 | ||
4e978d06 | 2168 | /* |
0efc89be FY |
2169 | * Move tasks from one to the other group. If @from is NULL, then all tasks |
2170 | * in the systems are moved unconditionally (used for teardown). | |
2171 | * | |
2172 | * If @mask is not NULL the cpus on which moved tasks are running are set | |
2173 | * in that mask so the update smp function call is restricted to affected | |
2174 | * cpus. | |
4e978d06 | 2175 | */ |
0efc89be FY |
2176 | static void rdt_move_group_tasks(struct rdtgroup *from, struct rdtgroup *to, |
2177 | struct cpumask *mask) | |
4e978d06 | 2178 | { |
e02737d5 FY |
2179 | struct task_struct *p, *t; |
2180 | ||
e02737d5 | 2181 | read_lock(&tasklist_lock); |
0efc89be | 2182 | for_each_process_thread(p, t) { |
f3cbeaca VS |
2183 | if (!from || is_closid_match(t, from) || |
2184 | is_rmid_match(t, from)) { | |
0efc89be | 2185 | t->closid = to->closid; |
f3cbeaca VS |
2186 | t->rmid = to->mon.rmid; |
2187 | ||
0efc89be FY |
2188 | #ifdef CONFIG_SMP |
2189 | /* | |
2190 | * This is safe on x86 w/o barriers as the ordering | |
2191 | * of writing to task_cpu() and t->on_cpu is | |
2192 | * reverse to the reading here. The detection is | |
2193 | * inaccurate as tasks might move or schedule | |
2194 | * before the smp function call takes place. In | |
2195 | * such a case the function call is pointless, but | |
2196 | * there is no other side effect. | |
2197 | */ | |
2198 | if (mask && t->on_cpu) | |
2199 | cpumask_set_cpu(task_cpu(t), mask); | |
2200 | #endif | |
2201 | } | |
2202 | } | |
e02737d5 | 2203 | read_unlock(&tasklist_lock); |
0efc89be FY |
2204 | } |
2205 | ||
f3cbeaca VS |
2206 | static void free_all_child_rdtgrp(struct rdtgroup *rdtgrp) |
2207 | { | |
2208 | struct rdtgroup *sentry, *stmp; | |
2209 | struct list_head *head; | |
2210 | ||
2211 | head = &rdtgrp->mon.crdtgrp_list; | |
2212 | list_for_each_entry_safe(sentry, stmp, head, mon.crdtgrp_list) { | |
2213 | free_rmid(sentry->mon.rmid); | |
2214 | list_del(&sentry->mon.crdtgrp_list); | |
2215 | kfree(sentry); | |
2216 | } | |
2217 | } | |
2218 | ||
0efc89be FY |
2219 | /* |
2220 | * Forcibly remove all of subdirectories under root. | |
2221 | */ | |
2222 | static void rmdir_all_sub(void) | |
2223 | { | |
2224 | struct rdtgroup *rdtgrp, *tmp; | |
2225 | ||
2226 | /* Move all tasks to the default resource group */ | |
2227 | rdt_move_group_tasks(NULL, &rdtgroup_default, NULL); | |
60cf5e10 | 2228 | |
60cf5e10 | 2229 | list_for_each_entry_safe(rdtgrp, tmp, &rdt_all_groups, rdtgroup_list) { |
4af4a88e VS |
2230 | /* Free any child rmids */ |
2231 | free_all_child_rdtgrp(rdtgrp); | |
2232 | ||
60cf5e10 FY |
2233 | /* Remove each rdtgroup other than root */ |
2234 | if (rdtgrp == &rdtgroup_default) | |
2235 | continue; | |
c7cc0cc1 | 2236 | |
e0bdfe8e RC |
2237 | if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP || |
2238 | rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) | |
2239 | rdtgroup_pseudo_lock_remove(rdtgrp); | |
2240 | ||
c7cc0cc1 FY |
2241 | /* |
2242 | * Give any CPUs back to the default group. We cannot copy | |
2243 | * cpu_online_mask because a CPU might have executed the | |
2244 | * offline callback already, but is still marked online. | |
2245 | */ | |
2246 | cpumask_or(&rdtgroup_default.cpu_mask, | |
2247 | &rdtgroup_default.cpu_mask, &rdtgrp->cpu_mask); | |
2248 | ||
4af4a88e VS |
2249 | free_rmid(rdtgrp->mon.rmid); |
2250 | ||
60cf5e10 FY |
2251 | kernfs_remove(rdtgrp->kn); |
2252 | list_del(&rdtgrp->rdtgroup_list); | |
2253 | kfree(rdtgrp); | |
2254 | } | |
0efc89be | 2255 | /* Notify online CPUs to update per cpu storage and PQR_ASSOC MSR */ |
a9fcf862 | 2256 | update_closid_rmid(cpu_online_mask, &rdtgroup_default); |
0efc89be | 2257 | |
4e978d06 | 2258 | kernfs_remove(kn_info); |
4af4a88e VS |
2259 | kernfs_remove(kn_mongrp); |
2260 | kernfs_remove(kn_mondata); | |
4e978d06 FY |
2261 | } |
2262 | ||
5ff193fb FY |
2263 | static void rdt_kill_sb(struct super_block *sb) |
2264 | { | |
2265 | struct rdt_resource *r; | |
2266 | ||
36b6f9fc | 2267 | cpus_read_lock(); |
5ff193fb FY |
2268 | mutex_lock(&rdtgroup_mutex); |
2269 | ||
19c635ab VS |
2270 | set_mba_sc(false); |
2271 | ||
5ff193fb | 2272 | /*Put everything back to default values. */ |
1b5c0b75 | 2273 | for_each_alloc_enabled_rdt_resource(r) |
2545e9f5 | 2274 | reset_all_ctrls(r); |
99adde9b | 2275 | cdp_disable_all(); |
4e978d06 | 2276 | rmdir_all_sub(); |
746e0859 | 2277 | rdt_pseudo_lock_release(); |
472ef09b | 2278 | rdtgroup_default.mode = RDT_MODE_SHAREABLE; |
36b6f9fc RC |
2279 | static_branch_disable_cpuslocked(&rdt_alloc_enable_key); |
2280 | static_branch_disable_cpuslocked(&rdt_mon_enable_key); | |
2281 | static_branch_disable_cpuslocked(&rdt_enable_key); | |
5ff193fb FY |
2282 | kernfs_kill_sb(sb); |
2283 | mutex_unlock(&rdtgroup_mutex); | |
36b6f9fc | 2284 | cpus_read_unlock(); |
5ff193fb FY |
2285 | } |
2286 | ||
2287 | static struct file_system_type rdt_fs_type = { | |
23bf1b6b DH |
2288 | .name = "resctrl", |
2289 | .init_fs_context = rdt_init_fs_context, | |
2290 | .parameters = &rdt_fs_parameters, | |
2291 | .kill_sb = rdt_kill_sb, | |
5ff193fb FY |
2292 | }; |
2293 | ||
d89b7379 VS |
2294 | static int mon_addfile(struct kernfs_node *parent_kn, const char *name, |
2295 | void *priv) | |
2296 | { | |
2297 | struct kernfs_node *kn; | |
2298 | int ret = 0; | |
2299 | ||
488dee96 DT |
2300 | kn = __kernfs_create_file(parent_kn, name, 0444, |
2301 | GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, 0, | |
d89b7379 VS |
2302 | &kf_mondata_ops, priv, NULL, NULL); |
2303 | if (IS_ERR(kn)) | |
2304 | return PTR_ERR(kn); | |
2305 | ||
2306 | ret = rdtgroup_kn_set_ugid(kn); | |
2307 | if (ret) { | |
2308 | kernfs_remove(kn); | |
2309 | return ret; | |
2310 | } | |
2311 | ||
2312 | return ret; | |
2313 | } | |
2314 | ||
895c663e VS |
2315 | /* |
2316 | * Remove all subdirectories of mon_data of ctrl_mon groups | |
2317 | * and monitor groups with given domain id. | |
2318 | */ | |
2319 | void rmdir_mondata_subdir_allrdtgrp(struct rdt_resource *r, unsigned int dom_id) | |
2320 | { | |
2321 | struct rdtgroup *prgrp, *crgrp; | |
2322 | char name[32]; | |
2323 | ||
2324 | if (!r->mon_enabled) | |
2325 | return; | |
2326 | ||
2327 | list_for_each_entry(prgrp, &rdt_all_groups, rdtgroup_list) { | |
2328 | sprintf(name, "mon_%s_%02d", r->name, dom_id); | |
2329 | kernfs_remove_by_name(prgrp->mon.mon_data_kn, name); | |
2330 | ||
2331 | list_for_each_entry(crgrp, &prgrp->mon.crdtgrp_list, mon.crdtgrp_list) | |
2332 | kernfs_remove_by_name(crgrp->mon.mon_data_kn, name); | |
2333 | } | |
2334 | } | |
2335 | ||
d89b7379 VS |
2336 | static int mkdir_mondata_subdir(struct kernfs_node *parent_kn, |
2337 | struct rdt_domain *d, | |
2338 | struct rdt_resource *r, struct rdtgroup *prgrp) | |
2339 | { | |
2340 | union mon_data_bits priv; | |
2341 | struct kernfs_node *kn; | |
2342 | struct mon_evt *mevt; | |
a4de1dfd | 2343 | struct rmid_read rr; |
d89b7379 VS |
2344 | char name[32]; |
2345 | int ret; | |
2346 | ||
2347 | sprintf(name, "mon_%s_%02d", r->name, d->id); | |
2348 | /* create the directory */ | |
2349 | kn = kernfs_create_dir(parent_kn, name, parent_kn->mode, prgrp); | |
2350 | if (IS_ERR(kn)) | |
2351 | return PTR_ERR(kn); | |
2352 | ||
2353 | /* | |
2354 | * This extra ref will be put in kernfs_remove() and guarantees | |
2355 | * that kn is always accessible. | |
2356 | */ | |
2357 | kernfs_get(kn); | |
2358 | ret = rdtgroup_kn_set_ugid(kn); | |
2359 | if (ret) | |
2360 | goto out_destroy; | |
2361 | ||
2362 | if (WARN_ON(list_empty(&r->evt_list))) { | |
2363 | ret = -EPERM; | |
2364 | goto out_destroy; | |
2365 | } | |
2366 | ||
2367 | priv.u.rid = r->rid; | |
2368 | priv.u.domid = d->id; | |
2369 | list_for_each_entry(mevt, &r->evt_list, list) { | |
2370 | priv.u.evtid = mevt->evtid; | |
2371 | ret = mon_addfile(kn, mevt->name, priv.priv); | |
2372 | if (ret) | |
2373 | goto out_destroy; | |
a4de1dfd VS |
2374 | |
2375 | if (is_mbm_event(mevt->evtid)) | |
2376 | mon_event_read(&rr, d, prgrp, mevt->evtid, true); | |
d89b7379 VS |
2377 | } |
2378 | kernfs_activate(kn); | |
2379 | return 0; | |
2380 | ||
2381 | out_destroy: | |
2382 | kernfs_remove(kn); | |
2383 | return ret; | |
2384 | } | |
2385 | ||
895c663e VS |
2386 | /* |
2387 | * Add all subdirectories of mon_data for "ctrl_mon" groups | |
2388 | * and "monitor" groups with given domain id. | |
2389 | */ | |
2390 | void mkdir_mondata_subdir_allrdtgrp(struct rdt_resource *r, | |
2391 | struct rdt_domain *d) | |
2392 | { | |
2393 | struct kernfs_node *parent_kn; | |
2394 | struct rdtgroup *prgrp, *crgrp; | |
2395 | struct list_head *head; | |
2396 | ||
2397 | if (!r->mon_enabled) | |
2398 | return; | |
2399 | ||
2400 | list_for_each_entry(prgrp, &rdt_all_groups, rdtgroup_list) { | |
2401 | parent_kn = prgrp->mon.mon_data_kn; | |
2402 | mkdir_mondata_subdir(parent_kn, d, r, prgrp); | |
2403 | ||
2404 | head = &prgrp->mon.crdtgrp_list; | |
2405 | list_for_each_entry(crgrp, head, mon.crdtgrp_list) { | |
2406 | parent_kn = crgrp->mon.mon_data_kn; | |
2407 | mkdir_mondata_subdir(parent_kn, d, r, crgrp); | |
2408 | } | |
2409 | } | |
2410 | } | |
2411 | ||
d89b7379 VS |
2412 | static int mkdir_mondata_subdir_alldom(struct kernfs_node *parent_kn, |
2413 | struct rdt_resource *r, | |
2414 | struct rdtgroup *prgrp) | |
2415 | { | |
2416 | struct rdt_domain *dom; | |
2417 | int ret; | |
2418 | ||
2419 | list_for_each_entry(dom, &r->domains, list) { | |
2420 | ret = mkdir_mondata_subdir(parent_kn, dom, r, prgrp); | |
2421 | if (ret) | |
2422 | return ret; | |
2423 | } | |
2424 | ||
2425 | return 0; | |
2426 | } | |
2427 | ||
2428 | /* | |
2429 | * This creates a directory mon_data which contains the monitored data. | |
2430 | * | |
2431 | * mon_data has one directory for each domain whic are named | |
2432 | * in the format mon_<domain_name>_<domain_id>. For ex: A mon_data | |
2433 | * with L3 domain looks as below: | |
2434 | * ./mon_data: | |
2435 | * mon_L3_00 | |
2436 | * mon_L3_01 | |
2437 | * mon_L3_02 | |
2438 | * ... | |
2439 | * | |
2440 | * Each domain directory has one file per event: | |
2441 | * ./mon_L3_00/: | |
2442 | * llc_occupancy | |
2443 | * | |
2444 | */ | |
2445 | static int mkdir_mondata_all(struct kernfs_node *parent_kn, | |
2446 | struct rdtgroup *prgrp, | |
2447 | struct kernfs_node **dest_kn) | |
2448 | { | |
2449 | struct rdt_resource *r; | |
2450 | struct kernfs_node *kn; | |
2451 | int ret; | |
2452 | ||
2453 | /* | |
2454 | * Create the mon_data directory first. | |
2455 | */ | |
2456 | ret = mongroup_create_dir(parent_kn, NULL, "mon_data", &kn); | |
2457 | if (ret) | |
2458 | return ret; | |
2459 | ||
2460 | if (dest_kn) | |
2461 | *dest_kn = kn; | |
2462 | ||
2463 | /* | |
2464 | * Create the subdirectories for each domain. Note that all events | |
2465 | * in a domain like L3 are grouped into a resource whose domain is L3 | |
2466 | */ | |
2467 | for_each_mon_enabled_rdt_resource(r) { | |
2468 | ret = mkdir_mondata_subdir_alldom(kn, r, prgrp); | |
2469 | if (ret) | |
2470 | goto out_destroy; | |
2471 | } | |
2472 | ||
2473 | return 0; | |
2474 | ||
2475 | out_destroy: | |
2476 | kernfs_remove(kn); | |
2477 | return ret; | |
2478 | } | |
2479 | ||
95f0b77e RC |
2480 | /** |
2481 | * cbm_ensure_valid - Enforce validity on provided CBM | |
2482 | * @_val: Candidate CBM | |
2483 | * @r: RDT resource to which the CBM belongs | |
2484 | * | |
2485 | * The provided CBM represents all cache portions available for use. This | |
2486 | * may be represented by a bitmap that does not consist of contiguous ones | |
2487 | * and thus be an invalid CBM. | |
2488 | * Here the provided CBM is forced to be a valid CBM by only considering | |
2489 | * the first set of contiguous bits as valid and clearing all bits. | |
2490 | * The intention here is to provide a valid default CBM with which a new | |
2491 | * resource group is initialized. The user can follow this with a | |
2492 | * modification to the CBM if the default does not satisfy the | |
2493 | * requirements. | |
2494 | */ | |
2495 | static void cbm_ensure_valid(u32 *_val, struct rdt_resource *r) | |
2496 | { | |
2497 | /* | |
2498 | * Convert the u32 _val to an unsigned long required by all the bit | |
2499 | * operations within this function. No more than 32 bits of this | |
2500 | * converted value can be accessed because all bit operations are | |
2501 | * additionally provided with cbm_len that is initialized during | |
2502 | * hardware enumeration using five bits from the EAX register and | |
2503 | * thus never can exceed 32 bits. | |
2504 | */ | |
2505 | unsigned long *val = (unsigned long *)_val; | |
2506 | unsigned int cbm_len = r->cache.cbm_len; | |
2507 | unsigned long first_bit, zero_bit; | |
2508 | ||
2509 | if (*val == 0) | |
2510 | return; | |
2511 | ||
2512 | first_bit = find_first_bit(val, cbm_len); | |
2513 | zero_bit = find_next_zero_bit(val, cbm_len, first_bit); | |
2514 | ||
2515 | /* Clear any remaining bits to ensure contiguous region */ | |
2516 | bitmap_clear(val, zero_bit, cbm_len - zero_bit); | |
2517 | } | |
2518 | ||
2519 | /** | |
2520 | * rdtgroup_init_alloc - Initialize the new RDT group's allocations | |
2521 | * | |
2522 | * A new RDT group is being created on an allocation capable (CAT) | |
2523 | * supporting system. Set this group up to start off with all usable | |
2524 | * allocations. That is, all shareable and unused bits. | |
2525 | * | |
2526 | * All-zero CBM is invalid. If there are no more shareable bits available | |
2527 | * on any domain then the entire allocation will fail. | |
2528 | */ | |
2529 | static int rdtgroup_init_alloc(struct rdtgroup *rdtgrp) | |
2530 | { | |
2a7adf6c RC |
2531 | struct rdt_resource *r_cdp = NULL; |
2532 | struct rdt_domain *d_cdp = NULL; | |
95f0b77e RC |
2533 | u32 used_b = 0, unused_b = 0; |
2534 | u32 closid = rdtgrp->closid; | |
2535 | struct rdt_resource *r; | |
49e00eee | 2536 | unsigned long tmp_cbm; |
95f0b77e RC |
2537 | enum rdtgrp_mode mode; |
2538 | struct rdt_domain *d; | |
2a7adf6c | 2539 | u32 peer_ctl, *ctrl; |
95f0b77e | 2540 | int i, ret; |
95f0b77e RC |
2541 | |
2542 | for_each_alloc_enabled_rdt_resource(r) { | |
70479c01 RC |
2543 | /* |
2544 | * Only initialize default allocations for CBM cache | |
2545 | * resources | |
2546 | */ | |
2547 | if (r->rid == RDT_RESOURCE_MBA) | |
2548 | continue; | |
95f0b77e | 2549 | list_for_each_entry(d, &r->domains, list) { |
2a7adf6c | 2550 | rdt_cdp_peer_get(r, d, &r_cdp, &d_cdp); |
95f0b77e RC |
2551 | d->have_new_ctrl = false; |
2552 | d->new_ctrl = r->cache.shareable_bits; | |
2553 | used_b = r->cache.shareable_bits; | |
2554 | ctrl = d->ctrl_val; | |
ffb2315f | 2555 | for (i = 0; i < closids_supported(); i++, ctrl++) { |
95f0b77e RC |
2556 | if (closid_allocated(i) && i != closid) { |
2557 | mode = rdtgroup_mode_by_closid(i); | |
dfe9674b RC |
2558 | if (mode == RDT_MODE_PSEUDO_LOCKSETUP) |
2559 | break; | |
2a7adf6c RC |
2560 | /* |
2561 | * If CDP is active include peer | |
2562 | * domain's usage to ensure there | |
2563 | * is no overlap with an exclusive | |
2564 | * group. | |
2565 | */ | |
2566 | if (d_cdp) | |
2567 | peer_ctl = d_cdp->ctrl_val[i]; | |
2568 | else | |
2569 | peer_ctl = 0; | |
2570 | used_b |= *ctrl | peer_ctl; | |
95f0b77e | 2571 | if (mode == RDT_MODE_SHAREABLE) |
2a7adf6c | 2572 | d->new_ctrl |= *ctrl | peer_ctl; |
95f0b77e RC |
2573 | } |
2574 | } | |
e0bdfe8e RC |
2575 | if (d->plr && d->plr->cbm > 0) |
2576 | used_b |= d->plr->cbm; | |
95f0b77e RC |
2577 | unused_b = used_b ^ (BIT_MASK(r->cache.cbm_len) - 1); |
2578 | unused_b &= BIT_MASK(r->cache.cbm_len) - 1; | |
2579 | d->new_ctrl |= unused_b; | |
2580 | /* | |
2581 | * Force the initial CBM to be valid, user can | |
2582 | * modify the CBM based on system availability. | |
2583 | */ | |
2584 | cbm_ensure_valid(&d->new_ctrl, r); | |
49e00eee RC |
2585 | /* |
2586 | * Assign the u32 CBM to an unsigned long to ensure | |
2587 | * that bitmap_weight() does not access out-of-bound | |
2588 | * memory. | |
2589 | */ | |
2590 | tmp_cbm = d->new_ctrl; | |
2591 | if (bitmap_weight(&tmp_cbm, r->cache.cbm_len) < | |
2592 | r->cache.min_cbm_bits) { | |
723f1a0d | 2593 | rdt_last_cmd_printf("No space on %s:%d\n", |
95f0b77e RC |
2594 | r->name, d->id); |
2595 | return -ENOSPC; | |
2596 | } | |
2597 | d->have_new_ctrl = true; | |
2598 | } | |
2599 | } | |
2600 | ||
2601 | for_each_alloc_enabled_rdt_resource(r) { | |
70479c01 RC |
2602 | /* |
2603 | * Only initialize default allocations for CBM cache | |
2604 | * resources | |
2605 | */ | |
2606 | if (r->rid == RDT_RESOURCE_MBA) | |
2607 | continue; | |
95f0b77e RC |
2608 | ret = update_domains(r, rdtgrp->closid); |
2609 | if (ret < 0) { | |
723f1a0d | 2610 | rdt_last_cmd_puts("Failed to initialize allocations\n"); |
95f0b77e RC |
2611 | return ret; |
2612 | } | |
2613 | rdtgrp->mode = RDT_MODE_SHAREABLE; | |
2614 | } | |
2615 | ||
2616 | return 0; | |
2617 | } | |
2618 | ||
65b4f403 VS |
2619 | static int mkdir_rdt_prepare(struct kernfs_node *parent_kn, |
2620 | struct kernfs_node *prgrp_kn, | |
2621 | const char *name, umode_t mode, | |
c7d9aac6 | 2622 | enum rdt_group_type rtype, struct rdtgroup **r) |
60cf5e10 | 2623 | { |
65b4f403 | 2624 | struct rdtgroup *prdtgrp, *rdtgrp; |
60cf5e10 | 2625 | struct kernfs_node *kn; |
65b4f403 VS |
2626 | uint files = 0; |
2627 | int ret; | |
60cf5e10 | 2628 | |
65b4f403 | 2629 | prdtgrp = rdtgroup_kn_lock_live(prgrp_kn); |
cfd0f34e | 2630 | rdt_last_cmd_clear(); |
65b4f403 | 2631 | if (!prdtgrp) { |
60cf5e10 | 2632 | ret = -ENODEV; |
723f1a0d | 2633 | rdt_last_cmd_puts("Directory was removed\n"); |
60cf5e10 FY |
2634 | goto out_unlock; |
2635 | } | |
2636 | ||
c966dac8 RC |
2637 | if (rtype == RDTMON_GROUP && |
2638 | (prdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP || | |
2639 | prdtgrp->mode == RDT_MODE_PSEUDO_LOCKED)) { | |
2640 | ret = -EINVAL; | |
723f1a0d | 2641 | rdt_last_cmd_puts("Pseudo-locking in progress\n"); |
c966dac8 RC |
2642 | goto out_unlock; |
2643 | } | |
2644 | ||
60cf5e10 FY |
2645 | /* allocate the rdtgroup. */ |
2646 | rdtgrp = kzalloc(sizeof(*rdtgrp), GFP_KERNEL); | |
2647 | if (!rdtgrp) { | |
2648 | ret = -ENOSPC; | |
723f1a0d | 2649 | rdt_last_cmd_puts("Kernel out of memory\n"); |
65b4f403 | 2650 | goto out_unlock; |
60cf5e10 | 2651 | } |
65b4f403 | 2652 | *r = rdtgrp; |
c7d9aac6 VS |
2653 | rdtgrp->mon.parent = prdtgrp; |
2654 | rdtgrp->type = rtype; | |
2655 | INIT_LIST_HEAD(&rdtgrp->mon.crdtgrp_list); | |
60cf5e10 FY |
2656 | |
2657 | /* kernfs creates the directory for rdtgrp */ | |
65b4f403 | 2658 | kn = kernfs_create_dir(parent_kn, name, mode, rdtgrp); |
60cf5e10 FY |
2659 | if (IS_ERR(kn)) { |
2660 | ret = PTR_ERR(kn); | |
cfd0f34e | 2661 | rdt_last_cmd_puts("kernfs create error\n"); |
65b4f403 | 2662 | goto out_free_rgrp; |
60cf5e10 FY |
2663 | } |
2664 | rdtgrp->kn = kn; | |
2665 | ||
2666 | /* | |
2667 | * kernfs_remove() will drop the reference count on "kn" which | |
2668 | * will free it. But we still need it to stick around for the | |
2669 | * rdtgroup_kn_unlock(kn} call below. Take one extra reference | |
2670 | * here, which will be dropped inside rdtgroup_kn_unlock(). | |
2671 | */ | |
2672 | kernfs_get(kn); | |
2673 | ||
2674 | ret = rdtgroup_kn_set_ugid(kn); | |
cfd0f34e TL |
2675 | if (ret) { |
2676 | rdt_last_cmd_puts("kernfs perm error\n"); | |
60cf5e10 | 2677 | goto out_destroy; |
cfd0f34e | 2678 | } |
60cf5e10 | 2679 | |
c7d9aac6 | 2680 | files = RFTYPE_BASE | BIT(RF_CTRLSHIFT + rtype); |
65b4f403 | 2681 | ret = rdtgroup_add_files(kn, files); |
cfd0f34e TL |
2682 | if (ret) { |
2683 | rdt_last_cmd_puts("kernfs fill error\n"); | |
12e0110c | 2684 | goto out_destroy; |
cfd0f34e | 2685 | } |
12e0110c | 2686 | |
c7d9aac6 VS |
2687 | if (rdt_mon_capable) { |
2688 | ret = alloc_rmid(); | |
cfd0f34e | 2689 | if (ret < 0) { |
723f1a0d | 2690 | rdt_last_cmd_puts("Out of RMIDs\n"); |
c7d9aac6 | 2691 | goto out_destroy; |
cfd0f34e | 2692 | } |
c7d9aac6 | 2693 | rdtgrp->mon.rmid = ret; |
d89b7379 VS |
2694 | |
2695 | ret = mkdir_mondata_all(kn, rdtgrp, &rdtgrp->mon.mon_data_kn); | |
cfd0f34e TL |
2696 | if (ret) { |
2697 | rdt_last_cmd_puts("kernfs subdir error\n"); | |
d89b7379 | 2698 | goto out_idfree; |
cfd0f34e | 2699 | } |
c7d9aac6 | 2700 | } |
60cf5e10 FY |
2701 | kernfs_activate(kn); |
2702 | ||
65b4f403 VS |
2703 | /* |
2704 | * The caller unlocks the prgrp_kn upon success. | |
2705 | */ | |
2706 | return 0; | |
60cf5e10 | 2707 | |
d89b7379 VS |
2708 | out_idfree: |
2709 | free_rmid(rdtgrp->mon.rmid); | |
60cf5e10 FY |
2710 | out_destroy: |
2711 | kernfs_remove(rdtgrp->kn); | |
65b4f403 | 2712 | out_free_rgrp: |
60cf5e10 | 2713 | kfree(rdtgrp); |
60cf5e10 | 2714 | out_unlock: |
65b4f403 VS |
2715 | rdtgroup_kn_unlock(prgrp_kn); |
2716 | return ret; | |
2717 | } | |
2718 | ||
2719 | static void mkdir_rdt_prepare_clean(struct rdtgroup *rgrp) | |
2720 | { | |
2721 | kernfs_remove(rgrp->kn); | |
c7d9aac6 | 2722 | free_rmid(rgrp->mon.rmid); |
65b4f403 VS |
2723 | kfree(rgrp); |
2724 | } | |
2725 | ||
c7d9aac6 VS |
2726 | /* |
2727 | * Create a monitor group under "mon_groups" directory of a control | |
2728 | * and monitor group(ctrl_mon). This is a resource group | |
2729 | * to monitor a subset of tasks and cpus in its parent ctrl_mon group. | |
2730 | */ | |
2731 | static int rdtgroup_mkdir_mon(struct kernfs_node *parent_kn, | |
2732 | struct kernfs_node *prgrp_kn, | |
2733 | const char *name, | |
2734 | umode_t mode) | |
2735 | { | |
2736 | struct rdtgroup *rdtgrp, *prgrp; | |
2737 | int ret; | |
2738 | ||
2739 | ret = mkdir_rdt_prepare(parent_kn, prgrp_kn, name, mode, RDTMON_GROUP, | |
2740 | &rdtgrp); | |
2741 | if (ret) | |
2742 | return ret; | |
2743 | ||
2744 | prgrp = rdtgrp->mon.parent; | |
2745 | rdtgrp->closid = prgrp->closid; | |
2746 | ||
2747 | /* | |
2748 | * Add the rdtgrp to the list of rdtgrps the parent | |
2749 | * ctrl_mon group has to track. | |
2750 | */ | |
2751 | list_add_tail(&rdtgrp->mon.crdtgrp_list, &prgrp->mon.crdtgrp_list); | |
2752 | ||
2753 | rdtgroup_kn_unlock(prgrp_kn); | |
2754 | return ret; | |
2755 | } | |
2756 | ||
65b4f403 VS |
2757 | /* |
2758 | * These are rdtgroups created under the root directory. Can be used | |
c7d9aac6 | 2759 | * to allocate and monitor resources. |
65b4f403 | 2760 | */ |
c7d9aac6 VS |
2761 | static int rdtgroup_mkdir_ctrl_mon(struct kernfs_node *parent_kn, |
2762 | struct kernfs_node *prgrp_kn, | |
2763 | const char *name, umode_t mode) | |
65b4f403 VS |
2764 | { |
2765 | struct rdtgroup *rdtgrp; | |
2766 | struct kernfs_node *kn; | |
2767 | u32 closid; | |
2768 | int ret; | |
2769 | ||
c7d9aac6 VS |
2770 | ret = mkdir_rdt_prepare(parent_kn, prgrp_kn, name, mode, RDTCTRL_GROUP, |
2771 | &rdtgrp); | |
65b4f403 VS |
2772 | if (ret) |
2773 | return ret; | |
2774 | ||
2775 | kn = rdtgrp->kn; | |
2776 | ret = closid_alloc(); | |
cfd0f34e | 2777 | if (ret < 0) { |
723f1a0d | 2778 | rdt_last_cmd_puts("Out of CLOSIDs\n"); |
65b4f403 | 2779 | goto out_common_fail; |
cfd0f34e | 2780 | } |
65b4f403 | 2781 | closid = ret; |
36e74d35 | 2782 | ret = 0; |
65b4f403 VS |
2783 | |
2784 | rdtgrp->closid = closid; | |
95f0b77e RC |
2785 | ret = rdtgroup_init_alloc(rdtgrp); |
2786 | if (ret < 0) | |
2787 | goto out_id_free; | |
2788 | ||
65b4f403 VS |
2789 | list_add(&rdtgrp->rdtgroup_list, &rdt_all_groups); |
2790 | ||
c7d9aac6 VS |
2791 | if (rdt_mon_capable) { |
2792 | /* | |
2793 | * Create an empty mon_groups directory to hold the subset | |
2794 | * of tasks and cpus to monitor. | |
2795 | */ | |
2796 | ret = mongroup_create_dir(kn, NULL, "mon_groups", NULL); | |
cfd0f34e TL |
2797 | if (ret) { |
2798 | rdt_last_cmd_puts("kernfs subdir error\n"); | |
95f0b77e | 2799 | goto out_del_list; |
cfd0f34e | 2800 | } |
c7d9aac6 VS |
2801 | } |
2802 | ||
65b4f403 VS |
2803 | goto out_unlock; |
2804 | ||
95f0b77e RC |
2805 | out_del_list: |
2806 | list_del(&rdtgrp->rdtgroup_list); | |
c7d9aac6 VS |
2807 | out_id_free: |
2808 | closid_free(closid); | |
65b4f403 VS |
2809 | out_common_fail: |
2810 | mkdir_rdt_prepare_clean(rdtgrp); | |
2811 | out_unlock: | |
2812 | rdtgroup_kn_unlock(prgrp_kn); | |
60cf5e10 FY |
2813 | return ret; |
2814 | } | |
2815 | ||
c7d9aac6 VS |
2816 | /* |
2817 | * We allow creating mon groups only with in a directory called "mon_groups" | |
2818 | * which is present in every ctrl_mon group. Check if this is a valid | |
2819 | * "mon_groups" directory. | |
2820 | * | |
2821 | * 1. The directory should be named "mon_groups". | |
2822 | * 2. The mon group itself should "not" be named "mon_groups". | |
2823 | * This makes sure "mon_groups" directory always has a ctrl_mon group | |
2824 | * as parent. | |
2825 | */ | |
2826 | static bool is_mon_groups(struct kernfs_node *kn, const char *name) | |
2827 | { | |
2828 | return (!strcmp(kn->name, "mon_groups") && | |
2829 | strcmp(name, "mon_groups")); | |
2830 | } | |
2831 | ||
65b4f403 VS |
2832 | static int rdtgroup_mkdir(struct kernfs_node *parent_kn, const char *name, |
2833 | umode_t mode) | |
2834 | { | |
2835 | /* Do not accept '\n' to avoid unparsable situation. */ | |
2836 | if (strchr(name, '\n')) | |
2837 | return -EINVAL; | |
2838 | ||
2839 | /* | |
2840 | * If the parent directory is the root directory and RDT | |
c7d9aac6 VS |
2841 | * allocation is supported, add a control and monitoring |
2842 | * subdirectory | |
65b4f403 VS |
2843 | */ |
2844 | if (rdt_alloc_capable && parent_kn == rdtgroup_default.kn) | |
c7d9aac6 VS |
2845 | return rdtgroup_mkdir_ctrl_mon(parent_kn, parent_kn, name, mode); |
2846 | ||
2847 | /* | |
2848 | * If RDT monitoring is supported and the parent directory is a valid | |
2849 | * "mon_groups" directory, add a monitoring subdirectory. | |
2850 | */ | |
2851 | if (rdt_mon_capable && is_mon_groups(parent_kn, name)) | |
2852 | return rdtgroup_mkdir_mon(parent_kn, parent_kn->parent, name, mode); | |
65b4f403 VS |
2853 | |
2854 | return -EPERM; | |
2855 | } | |
2856 | ||
f3cbeaca VS |
2857 | static int rdtgroup_rmdir_mon(struct kernfs_node *kn, struct rdtgroup *rdtgrp, |
2858 | cpumask_var_t tmpmask) | |
2859 | { | |
2860 | struct rdtgroup *prdtgrp = rdtgrp->mon.parent; | |
2861 | int cpu; | |
2862 | ||
2863 | /* Give any tasks back to the parent group */ | |
2864 | rdt_move_group_tasks(rdtgrp, prdtgrp, tmpmask); | |
2865 | ||
2866 | /* Update per cpu rmid of the moved CPUs first */ | |
2867 | for_each_cpu(cpu, &rdtgrp->cpu_mask) | |
a9110b55 | 2868 | per_cpu(pqr_state.default_rmid, cpu) = prdtgrp->mon.rmid; |
f3cbeaca VS |
2869 | /* |
2870 | * Update the MSR on moved CPUs and CPUs which have moved | |
2871 | * task running on them. | |
2872 | */ | |
2873 | cpumask_or(tmpmask, tmpmask, &rdtgrp->cpu_mask); | |
2874 | update_closid_rmid(tmpmask, NULL); | |
2875 | ||
2876 | rdtgrp->flags = RDT_DELETED; | |
2877 | free_rmid(rdtgrp->mon.rmid); | |
2878 | ||
2879 | /* | |
2880 | * Remove the rdtgrp from the parent ctrl_mon group's list | |
2881 | */ | |
2882 | WARN_ON(list_empty(&prdtgrp->mon.crdtgrp_list)); | |
2883 | list_del(&rdtgrp->mon.crdtgrp_list); | |
2884 | ||
2885 | /* | |
2886 | * one extra hold on this, will drop when we kfree(rdtgrp) | |
2887 | * in rdtgroup_kn_unlock() | |
2888 | */ | |
2889 | kernfs_get(kn); | |
2890 | kernfs_remove(rdtgrp->kn); | |
2891 | ||
2892 | return 0; | |
2893 | } | |
2894 | ||
17eafd07 RC |
2895 | static int rdtgroup_ctrl_remove(struct kernfs_node *kn, |
2896 | struct rdtgroup *rdtgrp) | |
2897 | { | |
2898 | rdtgrp->flags = RDT_DELETED; | |
2899 | list_del(&rdtgrp->rdtgroup_list); | |
2900 | ||
2901 | /* | |
2902 | * one extra hold on this, will drop when we kfree(rdtgrp) | |
2903 | * in rdtgroup_kn_unlock() | |
2904 | */ | |
2905 | kernfs_get(kn); | |
2906 | kernfs_remove(rdtgrp->kn); | |
2907 | return 0; | |
2908 | } | |
2909 | ||
f9049547 VS |
2910 | static int rdtgroup_rmdir_ctrl(struct kernfs_node *kn, struct rdtgroup *rdtgrp, |
2911 | cpumask_var_t tmpmask) | |
60cf5e10 | 2912 | { |
f9049547 | 2913 | int cpu; |
60cf5e10 | 2914 | |
e02737d5 | 2915 | /* Give any tasks back to the default group */ |
0efc89be | 2916 | rdt_move_group_tasks(rdtgrp, &rdtgroup_default, tmpmask); |
e02737d5 | 2917 | |
12e0110c TL |
2918 | /* Give any CPUs back to the default group */ |
2919 | cpumask_or(&rdtgroup_default.cpu_mask, | |
2920 | &rdtgroup_default.cpu_mask, &rdtgrp->cpu_mask); | |
0efc89be | 2921 | |
f3cbeaca VS |
2922 | /* Update per cpu closid and rmid of the moved CPUs first */ |
2923 | for_each_cpu(cpu, &rdtgrp->cpu_mask) { | |
a9110b55 VS |
2924 | per_cpu(pqr_state.default_closid, cpu) = rdtgroup_default.closid; |
2925 | per_cpu(pqr_state.default_rmid, cpu) = rdtgroup_default.mon.rmid; | |
f3cbeaca VS |
2926 | } |
2927 | ||
0efc89be FY |
2928 | /* |
2929 | * Update the MSR on moved CPUs and CPUs which have moved | |
2930 | * task running on them. | |
2931 | */ | |
2932 | cpumask_or(tmpmask, tmpmask, &rdtgrp->cpu_mask); | |
a9fcf862 | 2933 | update_closid_rmid(tmpmask, NULL); |
12e0110c | 2934 | |
60cf5e10 | 2935 | closid_free(rdtgrp->closid); |
f3cbeaca VS |
2936 | free_rmid(rdtgrp->mon.rmid); |
2937 | ||
2938 | /* | |
2939 | * Free all the child monitor group rmids. | |
2940 | */ | |
2941 | free_all_child_rdtgrp(rdtgrp); | |
2942 | ||
17eafd07 | 2943 | rdtgroup_ctrl_remove(kn, rdtgrp); |
f9049547 VS |
2944 | |
2945 | return 0; | |
2946 | } | |
2947 | ||
2948 | static int rdtgroup_rmdir(struct kernfs_node *kn) | |
2949 | { | |
2950 | struct kernfs_node *parent_kn = kn->parent; | |
2951 | struct rdtgroup *rdtgrp; | |
2952 | cpumask_var_t tmpmask; | |
2953 | int ret = 0; | |
2954 | ||
2955 | if (!zalloc_cpumask_var(&tmpmask, GFP_KERNEL)) | |
2956 | return -ENOMEM; | |
2957 | ||
2958 | rdtgrp = rdtgroup_kn_lock_live(kn); | |
2959 | if (!rdtgrp) { | |
2960 | ret = -EPERM; | |
2961 | goto out; | |
2962 | } | |
2963 | ||
2964 | /* | |
2965 | * If the rdtgroup is a ctrl_mon group and parent directory | |
f3cbeaca VS |
2966 | * is the root directory, remove the ctrl_mon group. |
2967 | * | |
2968 | * If the rdtgroup is a mon group and parent directory | |
2969 | * is a valid "mon_groups" directory, remove the mon group. | |
f9049547 | 2970 | */ |
e0bdfe8e RC |
2971 | if (rdtgrp->type == RDTCTRL_GROUP && parent_kn == rdtgroup_default.kn) { |
2972 | if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP || | |
2973 | rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) { | |
2974 | ret = rdtgroup_ctrl_remove(kn, rdtgrp); | |
2975 | } else { | |
2976 | ret = rdtgroup_rmdir_ctrl(kn, rdtgrp, tmpmask); | |
2977 | } | |
2978 | } else if (rdtgrp->type == RDTMON_GROUP && | |
2979 | is_mon_groups(parent_kn, kn->name)) { | |
f3cbeaca | 2980 | ret = rdtgroup_rmdir_mon(kn, rdtgrp, tmpmask); |
e0bdfe8e | 2981 | } else { |
f9049547 | 2982 | ret = -EPERM; |
e0bdfe8e | 2983 | } |
f9049547 | 2984 | |
0efc89be | 2985 | out: |
60cf5e10 | 2986 | rdtgroup_kn_unlock(kn); |
0efc89be FY |
2987 | free_cpumask_var(tmpmask); |
2988 | return ret; | |
60cf5e10 FY |
2989 | } |
2990 | ||
76ae054c SL |
2991 | static int rdtgroup_show_options(struct seq_file *seq, struct kernfs_root *kf) |
2992 | { | |
1b5c0b75 | 2993 | if (rdt_resources_all[RDT_RESOURCE_L3DATA].alloc_enabled) |
76ae054c | 2994 | seq_puts(seq, ",cdp"); |
2cc81c69 XS |
2995 | |
2996 | if (rdt_resources_all[RDT_RESOURCE_L2DATA].alloc_enabled) | |
2997 | seq_puts(seq, ",cdpl2"); | |
2998 | ||
2999 | if (is_mba_sc(&rdt_resources_all[RDT_RESOURCE_MBA])) | |
3000 | seq_puts(seq, ",mba_MBps"); | |
3001 | ||
76ae054c SL |
3002 | return 0; |
3003 | } | |
3004 | ||
5ff193fb | 3005 | static struct kernfs_syscall_ops rdtgroup_kf_syscall_ops = { |
76ae054c SL |
3006 | .mkdir = rdtgroup_mkdir, |
3007 | .rmdir = rdtgroup_rmdir, | |
3008 | .show_options = rdtgroup_show_options, | |
5ff193fb FY |
3009 | }; |
3010 | ||
3011 | static int __init rdtgroup_setup_root(void) | |
3012 | { | |
12e0110c TL |
3013 | int ret; |
3014 | ||
5ff193fb | 3015 | rdt_root = kernfs_create_root(&rdtgroup_kf_syscall_ops, |
21220bb1 RC |
3016 | KERNFS_ROOT_CREATE_DEACTIVATED | |
3017 | KERNFS_ROOT_EXTRA_OPEN_PERM_CHECK, | |
5ff193fb FY |
3018 | &rdtgroup_default); |
3019 | if (IS_ERR(rdt_root)) | |
3020 | return PTR_ERR(rdt_root); | |
3021 | ||
3022 | mutex_lock(&rdtgroup_mutex); | |
3023 | ||
3024 | rdtgroup_default.closid = 0; | |
c7d9aac6 VS |
3025 | rdtgroup_default.mon.rmid = 0; |
3026 | rdtgroup_default.type = RDTCTRL_GROUP; | |
3027 | INIT_LIST_HEAD(&rdtgroup_default.mon.crdtgrp_list); | |
3028 | ||
5ff193fb FY |
3029 | list_add(&rdtgroup_default.rdtgroup_list, &rdt_all_groups); |
3030 | ||
5dc1d5c6 | 3031 | ret = rdtgroup_add_files(rdt_root->kn, RF_CTRL_BASE); |
12e0110c TL |
3032 | if (ret) { |
3033 | kernfs_destroy_root(rdt_root); | |
3034 | goto out; | |
3035 | } | |
3036 | ||
5ff193fb FY |
3037 | rdtgroup_default.kn = rdt_root->kn; |
3038 | kernfs_activate(rdtgroup_default.kn); | |
3039 | ||
12e0110c | 3040 | out: |
5ff193fb FY |
3041 | mutex_unlock(&rdtgroup_mutex); |
3042 | ||
12e0110c | 3043 | return ret; |
5ff193fb FY |
3044 | } |
3045 | ||
3046 | /* | |
3047 | * rdtgroup_init - rdtgroup initialization | |
3048 | * | |
3049 | * Setup resctrl file system including set up root, create mount point, | |
3050 | * register rdtgroup filesystem, and initialize files under root directory. | |
3051 | * | |
3052 | * Return: 0 on success or -errno | |
3053 | */ | |
3054 | int __init rdtgroup_init(void) | |
3055 | { | |
3056 | int ret = 0; | |
3057 | ||
9b3a7fd0 TL |
3058 | seq_buf_init(&last_cmd_status, last_cmd_status_buf, |
3059 | sizeof(last_cmd_status_buf)); | |
3060 | ||
5ff193fb FY |
3061 | ret = rdtgroup_setup_root(); |
3062 | if (ret) | |
3063 | return ret; | |
3064 | ||
3065 | ret = sysfs_create_mount_point(fs_kobj, "resctrl"); | |
3066 | if (ret) | |
3067 | goto cleanup_root; | |
3068 | ||
3069 | ret = register_filesystem(&rdt_fs_type); | |
3070 | if (ret) | |
3071 | goto cleanup_mountpoint; | |
3072 | ||
37707ec6 RC |
3073 | /* |
3074 | * Adding the resctrl debugfs directory here may not be ideal since | |
3075 | * it would let the resctrl debugfs directory appear on the debugfs | |
3076 | * filesystem before the resctrl filesystem is mounted. | |
3077 | * It may also be ok since that would enable debugging of RDT before | |
3078 | * resctrl is mounted. | |
3079 | * The reason why the debugfs directory is created here and not in | |
3080 | * rdt_mount() is because rdt_mount() takes rdtgroup_mutex and | |
3081 | * during the debugfs directory creation also &sb->s_type->i_mutex_key | |
3082 | * (the lockdep class of inode->i_rwsem). Other filesystem | |
3083 | * interactions (eg. SyS_getdents) have the lock ordering: | |
3084 | * &sb->s_type->i_mutex_key --> &mm->mmap_sem | |
3085 | * During mmap(), called with &mm->mmap_sem, the rdtgroup_mutex | |
3086 | * is taken, thus creating dependency: | |
3087 | * &mm->mmap_sem --> rdtgroup_mutex for the latter that can cause | |
3088 | * issues considering the other two lock dependencies. | |
3089 | * By creating the debugfs directory here we avoid a dependency | |
3090 | * that may cause deadlock (even though file operations cannot | |
3091 | * occur until the filesystem is mounted, but I do not know how to | |
3092 | * tell lockdep that). | |
3093 | */ | |
3094 | debugfs_resctrl = debugfs_create_dir("resctrl", NULL); | |
3095 | ||
5ff193fb FY |
3096 | return 0; |
3097 | ||
3098 | cleanup_mountpoint: | |
3099 | sysfs_remove_mount_point(fs_kobj, "resctrl"); | |
3100 | cleanup_root: | |
3101 | kernfs_destroy_root(rdt_root); | |
3102 | ||
3103 | return ret; | |
3104 | } | |
0af6a48d RC |
3105 | |
3106 | void __exit rdtgroup_exit(void) | |
3107 | { | |
37707ec6 | 3108 | debugfs_remove_recursive(debugfs_resctrl); |
0af6a48d RC |
3109 | unregister_filesystem(&rdt_fs_type); |
3110 | sysfs_remove_mount_point(fs_kobj, "resctrl"); | |
3111 | kernfs_destroy_root(rdt_root); | |
3112 | } |