Loading...
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Resource Director Technology(RDT)
4 * - Cache Allocation code.
5 *
6 * Copyright (C) 2016 Intel Corporation
7 *
8 * Authors:
9 * Fenghua Yu <fenghua.yu@intel.com>
10 * Tony Luck <tony.luck@intel.com>
11 *
12 * More information about RDT be found in the Intel (R) x86 Architecture
13 * Software Developer Manual June 2016, volume 3, section 17.17.
14 */
15
16#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
17
18#include <linux/cpu.h>
19#include <linux/kernfs.h>
20#include <linux/seq_file.h>
21#include <linux/slab.h>
22#include "internal.h"
23
24/*
25 * Check whether MBA bandwidth percentage value is correct. The value is
26 * checked against the minimum and maximum bandwidth values specified by
27 * the hardware. The allocated bandwidth percentage is rounded to the next
28 * control step available on the hardware.
29 */
30static bool bw_validate_amd(char *buf, unsigned long *data,
31 struct rdt_resource *r)
32{
33 unsigned long bw;
34 int ret;
35
36 ret = kstrtoul(buf, 10, &bw);
37 if (ret) {
38 rdt_last_cmd_printf("Non-decimal digit in MB value %s\n", buf);
39 return false;
40 }
41
42 if (bw < r->membw.min_bw || bw > r->default_ctrl) {
43 rdt_last_cmd_printf("MB value %ld out of range [%d,%d]\n", bw,
44 r->membw.min_bw, r->default_ctrl);
45 return false;
46 }
47
48 *data = roundup(bw, (unsigned long)r->membw.bw_gran);
49 return true;
50}
51
52int parse_bw_amd(struct rdt_parse_data *data, struct rdt_resource *r,
53 struct rdt_domain *d)
54{
55 unsigned long bw_val;
56
57 if (d->have_new_ctrl) {
58 rdt_last_cmd_printf("Duplicate domain %d\n", d->id);
59 return -EINVAL;
60 }
61
62 if (!bw_validate_amd(data->buf, &bw_val, r))
63 return -EINVAL;
64
65 d->new_ctrl = bw_val;
66 d->have_new_ctrl = true;
67
68 return 0;
69}
70
71/*
72 * Check whether MBA bandwidth percentage value is correct. The value is
73 * checked against the minimum and max bandwidth values specified by the
74 * hardware. The allocated bandwidth percentage is rounded to the next
75 * control step available on the hardware.
76 */
77static bool bw_validate(char *buf, unsigned long *data, struct rdt_resource *r)
78{
79 unsigned long bw;
80 int ret;
81
82 /*
83 * Only linear delay values is supported for current Intel SKUs.
84 */
85 if (!r->membw.delay_linear) {
86 rdt_last_cmd_puts("No support for non-linear MB domains\n");
87 return false;
88 }
89
90 ret = kstrtoul(buf, 10, &bw);
91 if (ret) {
92 rdt_last_cmd_printf("Non-decimal digit in MB value %s\n", buf);
93 return false;
94 }
95
96 if ((bw < r->membw.min_bw || bw > r->default_ctrl) &&
97 !is_mba_sc(r)) {
98 rdt_last_cmd_printf("MB value %ld out of range [%d,%d]\n", bw,
99 r->membw.min_bw, r->default_ctrl);
100 return false;
101 }
102
103 *data = roundup(bw, (unsigned long)r->membw.bw_gran);
104 return true;
105}
106
107int parse_bw_intel(struct rdt_parse_data *data, struct rdt_resource *r,
108 struct rdt_domain *d)
109{
110 unsigned long bw_val;
111
112 if (d->have_new_ctrl) {
113 rdt_last_cmd_printf("Duplicate domain %d\n", d->id);
114 return -EINVAL;
115 }
116
117 if (!bw_validate(data->buf, &bw_val, r))
118 return -EINVAL;
119 d->new_ctrl = bw_val;
120 d->have_new_ctrl = true;
121
122 return 0;
123}
124
125/*
126 * Check whether a cache bit mask is valid. The SDM says:
127 * Please note that all (and only) contiguous '1' combinations
128 * are allowed (e.g. FFFFH, 0FF0H, 003CH, etc.).
129 * Additionally Haswell requires at least two bits set.
130 */
131bool cbm_validate_intel(char *buf, u32 *data, struct rdt_resource *r)
132{
133 unsigned long first_bit, zero_bit, val;
134 unsigned int cbm_len = r->cache.cbm_len;
135 int ret;
136
137 ret = kstrtoul(buf, 16, &val);
138 if (ret) {
139 rdt_last_cmd_printf("Non-hex character in the mask %s\n", buf);
140 return false;
141 }
142
143 if (val == 0 || val > r->default_ctrl) {
144 rdt_last_cmd_puts("Mask out of range\n");
145 return false;
146 }
147
148 first_bit = find_first_bit(&val, cbm_len);
149 zero_bit = find_next_zero_bit(&val, cbm_len, first_bit);
150
151 if (find_next_bit(&val, cbm_len, zero_bit) < cbm_len) {
152 rdt_last_cmd_printf("The mask %lx has non-consecutive 1-bits\n", val);
153 return false;
154 }
155
156 if ((zero_bit - first_bit) < r->cache.min_cbm_bits) {
157 rdt_last_cmd_printf("Need at least %d bits in the mask\n",
158 r->cache.min_cbm_bits);
159 return false;
160 }
161
162 *data = val;
163 return true;
164}
165
166/*
167 * Check whether a cache bit mask is valid. AMD allows non-contiguous
168 * bitmasks
169 */
170bool cbm_validate_amd(char *buf, u32 *data, struct rdt_resource *r)
171{
172 unsigned long val;
173 int ret;
174
175 ret = kstrtoul(buf, 16, &val);
176 if (ret) {
177 rdt_last_cmd_printf("Non-hex character in the mask %s\n", buf);
178 return false;
179 }
180
181 if (val > r->default_ctrl) {
182 rdt_last_cmd_puts("Mask out of range\n");
183 return false;
184 }
185
186 *data = val;
187 return true;
188}
189
190/*
191 * Read one cache bit mask (hex). Check that it is valid for the current
192 * resource type.
193 */
194int parse_cbm(struct rdt_parse_data *data, struct rdt_resource *r,
195 struct rdt_domain *d)
196{
197 struct rdtgroup *rdtgrp = data->rdtgrp;
198 u32 cbm_val;
199
200 if (d->have_new_ctrl) {
201 rdt_last_cmd_printf("Duplicate domain %d\n", d->id);
202 return -EINVAL;
203 }
204
205 /*
206 * Cannot set up more than one pseudo-locked region in a cache
207 * hierarchy.
208 */
209 if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP &&
210 rdtgroup_pseudo_locked_in_hierarchy(d)) {
211 rdt_last_cmd_puts("Pseudo-locked region in hierarchy\n");
212 return -EINVAL;
213 }
214
215 if (!r->cbm_validate(data->buf, &cbm_val, r))
216 return -EINVAL;
217
218 if ((rdtgrp->mode == RDT_MODE_EXCLUSIVE ||
219 rdtgrp->mode == RDT_MODE_SHAREABLE) &&
220 rdtgroup_cbm_overlaps_pseudo_locked(d, cbm_val)) {
221 rdt_last_cmd_puts("CBM overlaps with pseudo-locked region\n");
222 return -EINVAL;
223 }
224
225 /*
226 * The CBM may not overlap with the CBM of another closid if
227 * either is exclusive.
228 */
229 if (rdtgroup_cbm_overlaps(r, d, cbm_val, rdtgrp->closid, true)) {
230 rdt_last_cmd_puts("Overlaps with exclusive group\n");
231 return -EINVAL;
232 }
233
234 if (rdtgroup_cbm_overlaps(r, d, cbm_val, rdtgrp->closid, false)) {
235 if (rdtgrp->mode == RDT_MODE_EXCLUSIVE ||
236 rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
237 rdt_last_cmd_puts("Overlaps with other group\n");
238 return -EINVAL;
239 }
240 }
241
242 d->new_ctrl = cbm_val;
243 d->have_new_ctrl = true;
244
245 return 0;
246}
247
248/*
249 * For each domain in this resource we expect to find a series of:
250 * id=mask
251 * separated by ";". The "id" is in decimal, and must match one of
252 * the "id"s for this resource.
253 */
254static int parse_line(char *line, struct rdt_resource *r,
255 struct rdtgroup *rdtgrp)
256{
257 struct rdt_parse_data data;
258 char *dom = NULL, *id;
259 struct rdt_domain *d;
260 unsigned long dom_id;
261
262 if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP &&
263 r->rid == RDT_RESOURCE_MBA) {
264 rdt_last_cmd_puts("Cannot pseudo-lock MBA resource\n");
265 return -EINVAL;
266 }
267
268next:
269 if (!line || line[0] == '\0')
270 return 0;
271 dom = strsep(&line, ";");
272 id = strsep(&dom, "=");
273 if (!dom || kstrtoul(id, 10, &dom_id)) {
274 rdt_last_cmd_puts("Missing '=' or non-numeric domain\n");
275 return -EINVAL;
276 }
277 dom = strim(dom);
278 list_for_each_entry(d, &r->domains, list) {
279 if (d->id == dom_id) {
280 data.buf = dom;
281 data.rdtgrp = rdtgrp;
282 if (r->parse_ctrlval(&data, r, d))
283 return -EINVAL;
284 if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
285 /*
286 * In pseudo-locking setup mode and just
287 * parsed a valid CBM that should be
288 * pseudo-locked. Only one locked region per
289 * resource group and domain so just do
290 * the required initialization for single
291 * region and return.
292 */
293 rdtgrp->plr->r = r;
294 rdtgrp->plr->d = d;
295 rdtgrp->plr->cbm = d->new_ctrl;
296 d->plr = rdtgrp->plr;
297 return 0;
298 }
299 goto next;
300 }
301 }
302 return -EINVAL;
303}
304
305int update_domains(struct rdt_resource *r, int closid)
306{
307 struct msr_param msr_param;
308 cpumask_var_t cpu_mask;
309 struct rdt_domain *d;
310 bool mba_sc;
311 u32 *dc;
312 int cpu;
313
314 if (!zalloc_cpumask_var(&cpu_mask, GFP_KERNEL))
315 return -ENOMEM;
316
317 msr_param.low = closid;
318 msr_param.high = msr_param.low + 1;
319 msr_param.res = r;
320
321 mba_sc = is_mba_sc(r);
322 list_for_each_entry(d, &r->domains, list) {
323 dc = !mba_sc ? d->ctrl_val : d->mbps_val;
324 if (d->have_new_ctrl && d->new_ctrl != dc[closid]) {
325 cpumask_set_cpu(cpumask_any(&d->cpu_mask), cpu_mask);
326 dc[closid] = d->new_ctrl;
327 }
328 }
329
330 /*
331 * Avoid writing the control msr with control values when
332 * MBA software controller is enabled
333 */
334 if (cpumask_empty(cpu_mask) || mba_sc)
335 goto done;
336 cpu = get_cpu();
337 /* Update resource control msr on this CPU if it's in cpu_mask. */
338 if (cpumask_test_cpu(cpu, cpu_mask))
339 rdt_ctrl_update(&msr_param);
340 /* Update resource control msr on other CPUs. */
341 smp_call_function_many(cpu_mask, rdt_ctrl_update, &msr_param, 1);
342 put_cpu();
343
344done:
345 free_cpumask_var(cpu_mask);
346
347 return 0;
348}
349
350static int rdtgroup_parse_resource(char *resname, char *tok,
351 struct rdtgroup *rdtgrp)
352{
353 struct rdt_resource *r;
354
355 for_each_alloc_enabled_rdt_resource(r) {
356 if (!strcmp(resname, r->name) && rdtgrp->closid < r->num_closid)
357 return parse_line(tok, r, rdtgrp);
358 }
359 rdt_last_cmd_printf("Unknown or unsupported resource name '%s'\n", resname);
360 return -EINVAL;
361}
362
363ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
364 char *buf, size_t nbytes, loff_t off)
365{
366 struct rdtgroup *rdtgrp;
367 struct rdt_domain *dom;
368 struct rdt_resource *r;
369 char *tok, *resname;
370 int ret = 0;
371
372 /* Valid input requires a trailing newline */
373 if (nbytes == 0 || buf[nbytes - 1] != '\n')
374 return -EINVAL;
375 buf[nbytes - 1] = '\0';
376
377 cpus_read_lock();
378 rdtgrp = rdtgroup_kn_lock_live(of->kn);
379 if (!rdtgrp) {
380 rdtgroup_kn_unlock(of->kn);
381 cpus_read_unlock();
382 return -ENOENT;
383 }
384 rdt_last_cmd_clear();
385
386 /*
387 * No changes to pseudo-locked region allowed. It has to be removed
388 * and re-created instead.
389 */
390 if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) {
391 ret = -EINVAL;
392 rdt_last_cmd_puts("Resource group is pseudo-locked\n");
393 goto out;
394 }
395
396 for_each_alloc_enabled_rdt_resource(r) {
397 list_for_each_entry(dom, &r->domains, list)
398 dom->have_new_ctrl = false;
399 }
400
401 while ((tok = strsep(&buf, "\n")) != NULL) {
402 resname = strim(strsep(&tok, ":"));
403 if (!tok) {
404 rdt_last_cmd_puts("Missing ':'\n");
405 ret = -EINVAL;
406 goto out;
407 }
408 if (tok[0] == '\0') {
409 rdt_last_cmd_printf("Missing '%s' value\n", resname);
410 ret = -EINVAL;
411 goto out;
412 }
413 ret = rdtgroup_parse_resource(resname, tok, rdtgrp);
414 if (ret)
415 goto out;
416 }
417
418 for_each_alloc_enabled_rdt_resource(r) {
419 ret = update_domains(r, rdtgrp->closid);
420 if (ret)
421 goto out;
422 }
423
424 if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
425 /*
426 * If pseudo-locking fails we keep the resource group in
427 * mode RDT_MODE_PSEUDO_LOCKSETUP with its class of service
428 * active and updated for just the domain the pseudo-locked
429 * region was requested for.
430 */
431 ret = rdtgroup_pseudo_lock_create(rdtgrp);
432 }
433
434out:
435 rdtgroup_kn_unlock(of->kn);
436 cpus_read_unlock();
437 return ret ?: nbytes;
438}
439
440static void show_doms(struct seq_file *s, struct rdt_resource *r, int closid)
441{
442 struct rdt_domain *dom;
443 bool sep = false;
444 u32 ctrl_val;
445
446 seq_printf(s, "%*s:", max_name_width, r->name);
447 list_for_each_entry(dom, &r->domains, list) {
448 if (sep)
449 seq_puts(s, ";");
450
451 ctrl_val = (!is_mba_sc(r) ? dom->ctrl_val[closid] :
452 dom->mbps_val[closid]);
453 seq_printf(s, r->format_str, dom->id, max_data_width,
454 ctrl_val);
455 sep = true;
456 }
457 seq_puts(s, "\n");
458}
459
460int rdtgroup_schemata_show(struct kernfs_open_file *of,
461 struct seq_file *s, void *v)
462{
463 struct rdtgroup *rdtgrp;
464 struct rdt_resource *r;
465 int ret = 0;
466 u32 closid;
467
468 rdtgrp = rdtgroup_kn_lock_live(of->kn);
469 if (rdtgrp) {
470 if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
471 for_each_alloc_enabled_rdt_resource(r)
472 seq_printf(s, "%s:uninitialized\n", r->name);
473 } else if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) {
474 if (!rdtgrp->plr->d) {
475 rdt_last_cmd_clear();
476 rdt_last_cmd_puts("Cache domain offline\n");
477 ret = -ENODEV;
478 } else {
479 seq_printf(s, "%s:%d=%x\n",
480 rdtgrp->plr->r->name,
481 rdtgrp->plr->d->id,
482 rdtgrp->plr->cbm);
483 }
484 } else {
485 closid = rdtgrp->closid;
486 for_each_alloc_enabled_rdt_resource(r) {
487 if (closid < r->num_closid)
488 show_doms(s, r, closid);
489 }
490 }
491 } else {
492 ret = -ENOENT;
493 }
494 rdtgroup_kn_unlock(of->kn);
495 return ret;
496}
497
498void mon_event_read(struct rmid_read *rr, struct rdt_domain *d,
499 struct rdtgroup *rdtgrp, int evtid, int first)
500{
501 /*
502 * setup the parameters to send to the IPI to read the data.
503 */
504 rr->rgrp = rdtgrp;
505 rr->evtid = evtid;
506 rr->d = d;
507 rr->val = 0;
508 rr->first = first;
509
510 smp_call_function_any(&d->cpu_mask, mon_event_count, rr, 1);
511}
512
513int rdtgroup_mondata_show(struct seq_file *m, void *arg)
514{
515 struct kernfs_open_file *of = m->private;
516 u32 resid, evtid, domid;
517 struct rdtgroup *rdtgrp;
518 struct rdt_resource *r;
519 union mon_data_bits md;
520 struct rdt_domain *d;
521 struct rmid_read rr;
522 int ret = 0;
523
524 rdtgrp = rdtgroup_kn_lock_live(of->kn);
525 if (!rdtgrp) {
526 ret = -ENOENT;
527 goto out;
528 }
529
530 md.priv = of->kn->priv;
531 resid = md.u.rid;
532 domid = md.u.domid;
533 evtid = md.u.evtid;
534
535 r = &rdt_resources_all[resid];
536 d = rdt_find_domain(r, domid, NULL);
537 if (IS_ERR_OR_NULL(d)) {
538 ret = -ENOENT;
539 goto out;
540 }
541
542 mon_event_read(&rr, d, rdtgrp, evtid, false);
543
544 if (rr.val & RMID_VAL_ERROR)
545 seq_puts(m, "Error\n");
546 else if (rr.val & RMID_VAL_UNAVAIL)
547 seq_puts(m, "Unavailable\n");
548 else
549 seq_printf(m, "%llu\n", rr.val * r->mon_scale);
550
551out:
552 rdtgroup_kn_unlock(of->kn);
553 return ret;
554}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Resource Director Technology(RDT)
4 * - Cache Allocation code.
5 *
6 * Copyright (C) 2016 Intel Corporation
7 *
8 * Authors:
9 * Fenghua Yu <fenghua.yu@intel.com>
10 * Tony Luck <tony.luck@intel.com>
11 *
12 * More information about RDT be found in the Intel (R) x86 Architecture
13 * Software Developer Manual June 2016, volume 3, section 17.17.
14 */
15
16#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
17
18#include <linux/cpu.h>
19#include <linux/kernfs.h>
20#include <linux/seq_file.h>
21#include <linux/slab.h>
22#include <linux/tick.h>
23
24#include "internal.h"
25
26/*
27 * Check whether MBA bandwidth percentage value is correct. The value is
28 * checked against the minimum and max bandwidth values specified by the
29 * hardware. The allocated bandwidth percentage is rounded to the next
30 * control step available on the hardware.
31 */
32static bool bw_validate(char *buf, unsigned long *data, struct rdt_resource *r)
33{
34 unsigned long bw;
35 int ret;
36
37 /*
38 * Only linear delay values is supported for current Intel SKUs.
39 */
40 if (!r->membw.delay_linear && r->membw.arch_needs_linear) {
41 rdt_last_cmd_puts("No support for non-linear MB domains\n");
42 return false;
43 }
44
45 ret = kstrtoul(buf, 10, &bw);
46 if (ret) {
47 rdt_last_cmd_printf("Non-decimal digit in MB value %s\n", buf);
48 return false;
49 }
50
51 if ((bw < r->membw.min_bw || bw > r->default_ctrl) &&
52 !is_mba_sc(r)) {
53 rdt_last_cmd_printf("MB value %ld out of range [%d,%d]\n", bw,
54 r->membw.min_bw, r->default_ctrl);
55 return false;
56 }
57
58 *data = roundup(bw, (unsigned long)r->membw.bw_gran);
59 return true;
60}
61
62int parse_bw(struct rdt_parse_data *data, struct resctrl_schema *s,
63 struct rdt_domain *d)
64{
65 struct resctrl_staged_config *cfg;
66 u32 closid = data->rdtgrp->closid;
67 struct rdt_resource *r = s->res;
68 unsigned long bw_val;
69
70 cfg = &d->staged_config[s->conf_type];
71 if (cfg->have_new_ctrl) {
72 rdt_last_cmd_printf("Duplicate domain %d\n", d->id);
73 return -EINVAL;
74 }
75
76 if (!bw_validate(data->buf, &bw_val, r))
77 return -EINVAL;
78
79 if (is_mba_sc(r)) {
80 d->mbps_val[closid] = bw_val;
81 return 0;
82 }
83
84 cfg->new_ctrl = bw_val;
85 cfg->have_new_ctrl = true;
86
87 return 0;
88}
89
90/*
91 * Check whether a cache bit mask is valid.
92 * On Intel CPUs, non-contiguous 1s value support is indicated by CPUID:
93 * - CPUID.0x10.1:ECX[3]: L3 non-contiguous 1s value supported if 1
94 * - CPUID.0x10.2:ECX[3]: L2 non-contiguous 1s value supported if 1
95 *
96 * Haswell does not support a non-contiguous 1s value and additionally
97 * requires at least two bits set.
98 * AMD allows non-contiguous bitmasks.
99 */
100static bool cbm_validate(char *buf, u32 *data, struct rdt_resource *r)
101{
102 unsigned long first_bit, zero_bit, val;
103 unsigned int cbm_len = r->cache.cbm_len;
104 int ret;
105
106 ret = kstrtoul(buf, 16, &val);
107 if (ret) {
108 rdt_last_cmd_printf("Non-hex character in the mask %s\n", buf);
109 return false;
110 }
111
112 if ((r->cache.min_cbm_bits > 0 && val == 0) || val > r->default_ctrl) {
113 rdt_last_cmd_puts("Mask out of range\n");
114 return false;
115 }
116
117 first_bit = find_first_bit(&val, cbm_len);
118 zero_bit = find_next_zero_bit(&val, cbm_len, first_bit);
119
120 /* Are non-contiguous bitmasks allowed? */
121 if (!r->cache.arch_has_sparse_bitmasks &&
122 (find_next_bit(&val, cbm_len, zero_bit) < cbm_len)) {
123 rdt_last_cmd_printf("The mask %lx has non-consecutive 1-bits\n", val);
124 return false;
125 }
126
127 if ((zero_bit - first_bit) < r->cache.min_cbm_bits) {
128 rdt_last_cmd_printf("Need at least %d bits in the mask\n",
129 r->cache.min_cbm_bits);
130 return false;
131 }
132
133 *data = val;
134 return true;
135}
136
137/*
138 * Read one cache bit mask (hex). Check that it is valid for the current
139 * resource type.
140 */
141int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
142 struct rdt_domain *d)
143{
144 struct rdtgroup *rdtgrp = data->rdtgrp;
145 struct resctrl_staged_config *cfg;
146 struct rdt_resource *r = s->res;
147 u32 cbm_val;
148
149 cfg = &d->staged_config[s->conf_type];
150 if (cfg->have_new_ctrl) {
151 rdt_last_cmd_printf("Duplicate domain %d\n", d->id);
152 return -EINVAL;
153 }
154
155 /*
156 * Cannot set up more than one pseudo-locked region in a cache
157 * hierarchy.
158 */
159 if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP &&
160 rdtgroup_pseudo_locked_in_hierarchy(d)) {
161 rdt_last_cmd_puts("Pseudo-locked region in hierarchy\n");
162 return -EINVAL;
163 }
164
165 if (!cbm_validate(data->buf, &cbm_val, r))
166 return -EINVAL;
167
168 if ((rdtgrp->mode == RDT_MODE_EXCLUSIVE ||
169 rdtgrp->mode == RDT_MODE_SHAREABLE) &&
170 rdtgroup_cbm_overlaps_pseudo_locked(d, cbm_val)) {
171 rdt_last_cmd_puts("CBM overlaps with pseudo-locked region\n");
172 return -EINVAL;
173 }
174
175 /*
176 * The CBM may not overlap with the CBM of another closid if
177 * either is exclusive.
178 */
179 if (rdtgroup_cbm_overlaps(s, d, cbm_val, rdtgrp->closid, true)) {
180 rdt_last_cmd_puts("Overlaps with exclusive group\n");
181 return -EINVAL;
182 }
183
184 if (rdtgroup_cbm_overlaps(s, d, cbm_val, rdtgrp->closid, false)) {
185 if (rdtgrp->mode == RDT_MODE_EXCLUSIVE ||
186 rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
187 rdt_last_cmd_puts("Overlaps with other group\n");
188 return -EINVAL;
189 }
190 }
191
192 cfg->new_ctrl = cbm_val;
193 cfg->have_new_ctrl = true;
194
195 return 0;
196}
197
198/*
199 * For each domain in this resource we expect to find a series of:
200 * id=mask
201 * separated by ";". The "id" is in decimal, and must match one of
202 * the "id"s for this resource.
203 */
204static int parse_line(char *line, struct resctrl_schema *s,
205 struct rdtgroup *rdtgrp)
206{
207 enum resctrl_conf_type t = s->conf_type;
208 struct resctrl_staged_config *cfg;
209 struct rdt_resource *r = s->res;
210 struct rdt_parse_data data;
211 char *dom = NULL, *id;
212 struct rdt_domain *d;
213 unsigned long dom_id;
214
215 /* Walking r->domains, ensure it can't race with cpuhp */
216 lockdep_assert_cpus_held();
217
218 if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP &&
219 (r->rid == RDT_RESOURCE_MBA || r->rid == RDT_RESOURCE_SMBA)) {
220 rdt_last_cmd_puts("Cannot pseudo-lock MBA resource\n");
221 return -EINVAL;
222 }
223
224next:
225 if (!line || line[0] == '\0')
226 return 0;
227 dom = strsep(&line, ";");
228 id = strsep(&dom, "=");
229 if (!dom || kstrtoul(id, 10, &dom_id)) {
230 rdt_last_cmd_puts("Missing '=' or non-numeric domain\n");
231 return -EINVAL;
232 }
233 dom = strim(dom);
234 list_for_each_entry(d, &r->domains, list) {
235 if (d->id == dom_id) {
236 data.buf = dom;
237 data.rdtgrp = rdtgrp;
238 if (r->parse_ctrlval(&data, s, d))
239 return -EINVAL;
240 if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
241 cfg = &d->staged_config[t];
242 /*
243 * In pseudo-locking setup mode and just
244 * parsed a valid CBM that should be
245 * pseudo-locked. Only one locked region per
246 * resource group and domain so just do
247 * the required initialization for single
248 * region and return.
249 */
250 rdtgrp->plr->s = s;
251 rdtgrp->plr->d = d;
252 rdtgrp->plr->cbm = cfg->new_ctrl;
253 d->plr = rdtgrp->plr;
254 return 0;
255 }
256 goto next;
257 }
258 }
259 return -EINVAL;
260}
261
262static u32 get_config_index(u32 closid, enum resctrl_conf_type type)
263{
264 switch (type) {
265 default:
266 case CDP_NONE:
267 return closid;
268 case CDP_CODE:
269 return closid * 2 + 1;
270 case CDP_DATA:
271 return closid * 2;
272 }
273}
274
275static bool apply_config(struct rdt_hw_domain *hw_dom,
276 struct resctrl_staged_config *cfg, u32 idx,
277 cpumask_var_t cpu_mask)
278{
279 struct rdt_domain *dom = &hw_dom->d_resctrl;
280
281 if (cfg->new_ctrl != hw_dom->ctrl_val[idx]) {
282 cpumask_set_cpu(cpumask_any(&dom->cpu_mask), cpu_mask);
283 hw_dom->ctrl_val[idx] = cfg->new_ctrl;
284
285 return true;
286 }
287
288 return false;
289}
290
291int resctrl_arch_update_one(struct rdt_resource *r, struct rdt_domain *d,
292 u32 closid, enum resctrl_conf_type t, u32 cfg_val)
293{
294 struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
295 struct rdt_hw_domain *hw_dom = resctrl_to_arch_dom(d);
296 u32 idx = get_config_index(closid, t);
297 struct msr_param msr_param;
298
299 if (!cpumask_test_cpu(smp_processor_id(), &d->cpu_mask))
300 return -EINVAL;
301
302 hw_dom->ctrl_val[idx] = cfg_val;
303
304 msr_param.res = r;
305 msr_param.low = idx;
306 msr_param.high = idx + 1;
307 hw_res->msr_update(d, &msr_param, r);
308
309 return 0;
310}
311
312int resctrl_arch_update_domains(struct rdt_resource *r, u32 closid)
313{
314 struct resctrl_staged_config *cfg;
315 struct rdt_hw_domain *hw_dom;
316 struct msr_param msr_param;
317 enum resctrl_conf_type t;
318 cpumask_var_t cpu_mask;
319 struct rdt_domain *d;
320 u32 idx;
321
322 /* Walking r->domains, ensure it can't race with cpuhp */
323 lockdep_assert_cpus_held();
324
325 if (!zalloc_cpumask_var(&cpu_mask, GFP_KERNEL))
326 return -ENOMEM;
327
328 msr_param.res = NULL;
329 list_for_each_entry(d, &r->domains, list) {
330 hw_dom = resctrl_to_arch_dom(d);
331 for (t = 0; t < CDP_NUM_TYPES; t++) {
332 cfg = &hw_dom->d_resctrl.staged_config[t];
333 if (!cfg->have_new_ctrl)
334 continue;
335
336 idx = get_config_index(closid, t);
337 if (!apply_config(hw_dom, cfg, idx, cpu_mask))
338 continue;
339
340 if (!msr_param.res) {
341 msr_param.low = idx;
342 msr_param.high = msr_param.low + 1;
343 msr_param.res = r;
344 } else {
345 msr_param.low = min(msr_param.low, idx);
346 msr_param.high = max(msr_param.high, idx + 1);
347 }
348 }
349 }
350
351 if (cpumask_empty(cpu_mask))
352 goto done;
353
354 /* Update resource control msr on all the CPUs. */
355 on_each_cpu_mask(cpu_mask, rdt_ctrl_update, &msr_param, 1);
356
357done:
358 free_cpumask_var(cpu_mask);
359
360 return 0;
361}
362
363static int rdtgroup_parse_resource(char *resname, char *tok,
364 struct rdtgroup *rdtgrp)
365{
366 struct resctrl_schema *s;
367
368 list_for_each_entry(s, &resctrl_schema_all, list) {
369 if (!strcmp(resname, s->name) && rdtgrp->closid < s->num_closid)
370 return parse_line(tok, s, rdtgrp);
371 }
372 rdt_last_cmd_printf("Unknown or unsupported resource name '%s'\n", resname);
373 return -EINVAL;
374}
375
376ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
377 char *buf, size_t nbytes, loff_t off)
378{
379 struct resctrl_schema *s;
380 struct rdtgroup *rdtgrp;
381 struct rdt_resource *r;
382 char *tok, *resname;
383 int ret = 0;
384
385 /* Valid input requires a trailing newline */
386 if (nbytes == 0 || buf[nbytes - 1] != '\n')
387 return -EINVAL;
388 buf[nbytes - 1] = '\0';
389
390 rdtgrp = rdtgroup_kn_lock_live(of->kn);
391 if (!rdtgrp) {
392 rdtgroup_kn_unlock(of->kn);
393 return -ENOENT;
394 }
395 rdt_last_cmd_clear();
396
397 /*
398 * No changes to pseudo-locked region allowed. It has to be removed
399 * and re-created instead.
400 */
401 if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) {
402 ret = -EINVAL;
403 rdt_last_cmd_puts("Resource group is pseudo-locked\n");
404 goto out;
405 }
406
407 rdt_staged_configs_clear();
408
409 while ((tok = strsep(&buf, "\n")) != NULL) {
410 resname = strim(strsep(&tok, ":"));
411 if (!tok) {
412 rdt_last_cmd_puts("Missing ':'\n");
413 ret = -EINVAL;
414 goto out;
415 }
416 if (tok[0] == '\0') {
417 rdt_last_cmd_printf("Missing '%s' value\n", resname);
418 ret = -EINVAL;
419 goto out;
420 }
421 ret = rdtgroup_parse_resource(resname, tok, rdtgrp);
422 if (ret)
423 goto out;
424 }
425
426 list_for_each_entry(s, &resctrl_schema_all, list) {
427 r = s->res;
428
429 /*
430 * Writes to mba_sc resources update the software controller,
431 * not the control MSR.
432 */
433 if (is_mba_sc(r))
434 continue;
435
436 ret = resctrl_arch_update_domains(r, rdtgrp->closid);
437 if (ret)
438 goto out;
439 }
440
441 if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
442 /*
443 * If pseudo-locking fails we keep the resource group in
444 * mode RDT_MODE_PSEUDO_LOCKSETUP with its class of service
445 * active and updated for just the domain the pseudo-locked
446 * region was requested for.
447 */
448 ret = rdtgroup_pseudo_lock_create(rdtgrp);
449 }
450
451out:
452 rdt_staged_configs_clear();
453 rdtgroup_kn_unlock(of->kn);
454 return ret ?: nbytes;
455}
456
457u32 resctrl_arch_get_config(struct rdt_resource *r, struct rdt_domain *d,
458 u32 closid, enum resctrl_conf_type type)
459{
460 struct rdt_hw_domain *hw_dom = resctrl_to_arch_dom(d);
461 u32 idx = get_config_index(closid, type);
462
463 return hw_dom->ctrl_val[idx];
464}
465
466static void show_doms(struct seq_file *s, struct resctrl_schema *schema, int closid)
467{
468 struct rdt_resource *r = schema->res;
469 struct rdt_domain *dom;
470 bool sep = false;
471 u32 ctrl_val;
472
473 /* Walking r->domains, ensure it can't race with cpuhp */
474 lockdep_assert_cpus_held();
475
476 seq_printf(s, "%*s:", max_name_width, schema->name);
477 list_for_each_entry(dom, &r->domains, list) {
478 if (sep)
479 seq_puts(s, ";");
480
481 if (is_mba_sc(r))
482 ctrl_val = dom->mbps_val[closid];
483 else
484 ctrl_val = resctrl_arch_get_config(r, dom, closid,
485 schema->conf_type);
486
487 seq_printf(s, r->format_str, dom->id, max_data_width,
488 ctrl_val);
489 sep = true;
490 }
491 seq_puts(s, "\n");
492}
493
494int rdtgroup_schemata_show(struct kernfs_open_file *of,
495 struct seq_file *s, void *v)
496{
497 struct resctrl_schema *schema;
498 struct rdtgroup *rdtgrp;
499 int ret = 0;
500 u32 closid;
501
502 rdtgrp = rdtgroup_kn_lock_live(of->kn);
503 if (rdtgrp) {
504 if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
505 list_for_each_entry(schema, &resctrl_schema_all, list) {
506 seq_printf(s, "%s:uninitialized\n", schema->name);
507 }
508 } else if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) {
509 if (!rdtgrp->plr->d) {
510 rdt_last_cmd_clear();
511 rdt_last_cmd_puts("Cache domain offline\n");
512 ret = -ENODEV;
513 } else {
514 seq_printf(s, "%s:%d=%x\n",
515 rdtgrp->plr->s->res->name,
516 rdtgrp->plr->d->id,
517 rdtgrp->plr->cbm);
518 }
519 } else {
520 closid = rdtgrp->closid;
521 list_for_each_entry(schema, &resctrl_schema_all, list) {
522 if (closid < schema->num_closid)
523 show_doms(s, schema, closid);
524 }
525 }
526 } else {
527 ret = -ENOENT;
528 }
529 rdtgroup_kn_unlock(of->kn);
530 return ret;
531}
532
533static int smp_mon_event_count(void *arg)
534{
535 mon_event_count(arg);
536
537 return 0;
538}
539
540void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
541 struct rdt_domain *d, struct rdtgroup *rdtgrp,
542 int evtid, int first)
543{
544 int cpu;
545
546 /* When picking a CPU from cpu_mask, ensure it can't race with cpuhp */
547 lockdep_assert_cpus_held();
548
549 /*
550 * Setup the parameters to pass to mon_event_count() to read the data.
551 */
552 rr->rgrp = rdtgrp;
553 rr->evtid = evtid;
554 rr->r = r;
555 rr->d = d;
556 rr->val = 0;
557 rr->first = first;
558 rr->arch_mon_ctx = resctrl_arch_mon_ctx_alloc(r, evtid);
559 if (IS_ERR(rr->arch_mon_ctx)) {
560 rr->err = -EINVAL;
561 return;
562 }
563
564 cpu = cpumask_any_housekeeping(&d->cpu_mask, RESCTRL_PICK_ANY_CPU);
565
566 /*
567 * cpumask_any_housekeeping() prefers housekeeping CPUs, but
568 * are all the CPUs nohz_full? If yes, pick a CPU to IPI.
569 * MPAM's resctrl_arch_rmid_read() is unable to read the
570 * counters on some platforms if its called in IRQ context.
571 */
572 if (tick_nohz_full_cpu(cpu))
573 smp_call_function_any(&d->cpu_mask, mon_event_count, rr, 1);
574 else
575 smp_call_on_cpu(cpu, smp_mon_event_count, rr, false);
576
577 resctrl_arch_mon_ctx_free(r, evtid, rr->arch_mon_ctx);
578}
579
580int rdtgroup_mondata_show(struct seq_file *m, void *arg)
581{
582 struct kernfs_open_file *of = m->private;
583 u32 resid, evtid, domid;
584 struct rdtgroup *rdtgrp;
585 struct rdt_resource *r;
586 union mon_data_bits md;
587 struct rdt_domain *d;
588 struct rmid_read rr;
589 int ret = 0;
590
591 rdtgrp = rdtgroup_kn_lock_live(of->kn);
592 if (!rdtgrp) {
593 ret = -ENOENT;
594 goto out;
595 }
596
597 md.priv = of->kn->priv;
598 resid = md.u.rid;
599 domid = md.u.domid;
600 evtid = md.u.evtid;
601
602 r = &rdt_resources_all[resid].r_resctrl;
603 d = rdt_find_domain(r, domid, NULL);
604 if (IS_ERR_OR_NULL(d)) {
605 ret = -ENOENT;
606 goto out;
607 }
608
609 mon_event_read(&rr, r, d, rdtgrp, evtid, false);
610
611 if (rr.err == -EIO)
612 seq_puts(m, "Error\n");
613 else if (rr.err == -EINVAL)
614 seq_puts(m, "Unavailable\n");
615 else
616 seq_printf(m, "%llu\n", rr.val);
617
618out:
619 rdtgroup_kn_unlock(of->kn);
620 return ret;
621}