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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 "internal.h"
23
24/*
25 * Check whether MBA bandwidth percentage value is correct. The value is
26 * checked against the minimum and max bandwidth values specified by the
27 * hardware. The allocated bandwidth percentage is rounded to the next
28 * control step available on the hardware.
29 */
30static bool bw_validate(char *buf, unsigned long *data, struct rdt_resource *r)
31{
32 unsigned long bw;
33 int ret;
34
35 /*
36 * Only linear delay values is supported for current Intel SKUs.
37 */
38 if (!r->membw.delay_linear && r->membw.arch_needs_linear) {
39 rdt_last_cmd_puts("No support for non-linear MB domains\n");
40 return false;
41 }
42
43 ret = kstrtoul(buf, 10, &bw);
44 if (ret) {
45 rdt_last_cmd_printf("Non-decimal digit in MB value %s\n", buf);
46 return false;
47 }
48
49 if ((bw < r->membw.min_bw || bw > r->default_ctrl) &&
50 !is_mba_sc(r)) {
51 rdt_last_cmd_printf("MB value %ld out of range [%d,%d]\n", bw,
52 r->membw.min_bw, r->default_ctrl);
53 return false;
54 }
55
56 *data = roundup(bw, (unsigned long)r->membw.bw_gran);
57 return true;
58}
59
60int parse_bw(struct rdt_parse_data *data, struct rdt_resource *r,
61 struct rdt_domain *d)
62{
63 unsigned long bw_val;
64
65 if (d->have_new_ctrl) {
66 rdt_last_cmd_printf("Duplicate domain %d\n", d->id);
67 return -EINVAL;
68 }
69
70 if (!bw_validate(data->buf, &bw_val, r))
71 return -EINVAL;
72 d->new_ctrl = bw_val;
73 d->have_new_ctrl = true;
74
75 return 0;
76}
77
78/*
79 * Check whether a cache bit mask is valid.
80 * For Intel the SDM says:
81 * Please note that all (and only) contiguous '1' combinations
82 * are allowed (e.g. FFFFH, 0FF0H, 003CH, etc.).
83 * Additionally Haswell requires at least two bits set.
84 * AMD allows non-contiguous bitmasks.
85 */
86static bool cbm_validate(char *buf, u32 *data, struct rdt_resource *r)
87{
88 unsigned long first_bit, zero_bit, val;
89 unsigned int cbm_len = r->cache.cbm_len;
90 int ret;
91
92 ret = kstrtoul(buf, 16, &val);
93 if (ret) {
94 rdt_last_cmd_printf("Non-hex character in the mask %s\n", buf);
95 return false;
96 }
97
98 if ((!r->cache.arch_has_empty_bitmaps && val == 0) ||
99 val > r->default_ctrl) {
100 rdt_last_cmd_puts("Mask out of range\n");
101 return false;
102 }
103
104 first_bit = find_first_bit(&val, cbm_len);
105 zero_bit = find_next_zero_bit(&val, cbm_len, first_bit);
106
107 /* Are non-contiguous bitmaps allowed? */
108 if (!r->cache.arch_has_sparse_bitmaps &&
109 (find_next_bit(&val, cbm_len, zero_bit) < cbm_len)) {
110 rdt_last_cmd_printf("The mask %lx has non-consecutive 1-bits\n", val);
111 return false;
112 }
113
114 if ((zero_bit - first_bit) < r->cache.min_cbm_bits) {
115 rdt_last_cmd_printf("Need at least %d bits in the mask\n",
116 r->cache.min_cbm_bits);
117 return false;
118 }
119
120 *data = val;
121 return true;
122}
123
124/*
125 * Read one cache bit mask (hex). Check that it is valid for the current
126 * resource type.
127 */
128int parse_cbm(struct rdt_parse_data *data, struct rdt_resource *r,
129 struct rdt_domain *d)
130{
131 struct rdtgroup *rdtgrp = data->rdtgrp;
132 u32 cbm_val;
133
134 if (d->have_new_ctrl) {
135 rdt_last_cmd_printf("Duplicate domain %d\n", d->id);
136 return -EINVAL;
137 }
138
139 /*
140 * Cannot set up more than one pseudo-locked region in a cache
141 * hierarchy.
142 */
143 if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP &&
144 rdtgroup_pseudo_locked_in_hierarchy(d)) {
145 rdt_last_cmd_puts("Pseudo-locked region in hierarchy\n");
146 return -EINVAL;
147 }
148
149 if (!cbm_validate(data->buf, &cbm_val, r))
150 return -EINVAL;
151
152 if ((rdtgrp->mode == RDT_MODE_EXCLUSIVE ||
153 rdtgrp->mode == RDT_MODE_SHAREABLE) &&
154 rdtgroup_cbm_overlaps_pseudo_locked(d, cbm_val)) {
155 rdt_last_cmd_puts("CBM overlaps with pseudo-locked region\n");
156 return -EINVAL;
157 }
158
159 /*
160 * The CBM may not overlap with the CBM of another closid if
161 * either is exclusive.
162 */
163 if (rdtgroup_cbm_overlaps(r, d, cbm_val, rdtgrp->closid, true)) {
164 rdt_last_cmd_puts("Overlaps with exclusive group\n");
165 return -EINVAL;
166 }
167
168 if (rdtgroup_cbm_overlaps(r, d, cbm_val, rdtgrp->closid, false)) {
169 if (rdtgrp->mode == RDT_MODE_EXCLUSIVE ||
170 rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
171 rdt_last_cmd_puts("Overlaps with other group\n");
172 return -EINVAL;
173 }
174 }
175
176 d->new_ctrl = cbm_val;
177 d->have_new_ctrl = true;
178
179 return 0;
180}
181
182/*
183 * For each domain in this resource we expect to find a series of:
184 * id=mask
185 * separated by ";". The "id" is in decimal, and must match one of
186 * the "id"s for this resource.
187 */
188static int parse_line(char *line, struct rdt_resource *r,
189 struct rdtgroup *rdtgrp)
190{
191 struct rdt_parse_data data;
192 char *dom = NULL, *id;
193 struct rdt_domain *d;
194 unsigned long dom_id;
195
196 if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP &&
197 r->rid == RDT_RESOURCE_MBA) {
198 rdt_last_cmd_puts("Cannot pseudo-lock MBA resource\n");
199 return -EINVAL;
200 }
201
202next:
203 if (!line || line[0] == '\0')
204 return 0;
205 dom = strsep(&line, ";");
206 id = strsep(&dom, "=");
207 if (!dom || kstrtoul(id, 10, &dom_id)) {
208 rdt_last_cmd_puts("Missing '=' or non-numeric domain\n");
209 return -EINVAL;
210 }
211 dom = strim(dom);
212 list_for_each_entry(d, &r->domains, list) {
213 if (d->id == dom_id) {
214 data.buf = dom;
215 data.rdtgrp = rdtgrp;
216 if (r->parse_ctrlval(&data, r, d))
217 return -EINVAL;
218 if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
219 /*
220 * In pseudo-locking setup mode and just
221 * parsed a valid CBM that should be
222 * pseudo-locked. Only one locked region per
223 * resource group and domain so just do
224 * the required initialization for single
225 * region and return.
226 */
227 rdtgrp->plr->r = r;
228 rdtgrp->plr->d = d;
229 rdtgrp->plr->cbm = d->new_ctrl;
230 d->plr = rdtgrp->plr;
231 return 0;
232 }
233 goto next;
234 }
235 }
236 return -EINVAL;
237}
238
239int update_domains(struct rdt_resource *r, int closid)
240{
241 struct msr_param msr_param;
242 cpumask_var_t cpu_mask;
243 struct rdt_domain *d;
244 bool mba_sc;
245 u32 *dc;
246 int cpu;
247
248 if (!zalloc_cpumask_var(&cpu_mask, GFP_KERNEL))
249 return -ENOMEM;
250
251 msr_param.low = closid;
252 msr_param.high = msr_param.low + 1;
253 msr_param.res = r;
254
255 mba_sc = is_mba_sc(r);
256 list_for_each_entry(d, &r->domains, list) {
257 dc = !mba_sc ? d->ctrl_val : d->mbps_val;
258 if (d->have_new_ctrl && d->new_ctrl != dc[closid]) {
259 cpumask_set_cpu(cpumask_any(&d->cpu_mask), cpu_mask);
260 dc[closid] = d->new_ctrl;
261 }
262 }
263
264 /*
265 * Avoid writing the control msr with control values when
266 * MBA software controller is enabled
267 */
268 if (cpumask_empty(cpu_mask) || mba_sc)
269 goto done;
270 cpu = get_cpu();
271 /* Update resource control msr on this CPU if it's in cpu_mask. */
272 if (cpumask_test_cpu(cpu, cpu_mask))
273 rdt_ctrl_update(&msr_param);
274 /* Update resource control msr on other CPUs. */
275 smp_call_function_many(cpu_mask, rdt_ctrl_update, &msr_param, 1);
276 put_cpu();
277
278done:
279 free_cpumask_var(cpu_mask);
280
281 return 0;
282}
283
284static int rdtgroup_parse_resource(char *resname, char *tok,
285 struct rdtgroup *rdtgrp)
286{
287 struct rdt_resource *r;
288
289 for_each_alloc_enabled_rdt_resource(r) {
290 if (!strcmp(resname, r->name) && rdtgrp->closid < r->num_closid)
291 return parse_line(tok, r, rdtgrp);
292 }
293 rdt_last_cmd_printf("Unknown or unsupported resource name '%s'\n", resname);
294 return -EINVAL;
295}
296
297ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
298 char *buf, size_t nbytes, loff_t off)
299{
300 struct rdtgroup *rdtgrp;
301 struct rdt_domain *dom;
302 struct rdt_resource *r;
303 char *tok, *resname;
304 int ret = 0;
305
306 /* Valid input requires a trailing newline */
307 if (nbytes == 0 || buf[nbytes - 1] != '\n')
308 return -EINVAL;
309 buf[nbytes - 1] = '\0';
310
311 cpus_read_lock();
312 rdtgrp = rdtgroup_kn_lock_live(of->kn);
313 if (!rdtgrp) {
314 rdtgroup_kn_unlock(of->kn);
315 cpus_read_unlock();
316 return -ENOENT;
317 }
318 rdt_last_cmd_clear();
319
320 /*
321 * No changes to pseudo-locked region allowed. It has to be removed
322 * and re-created instead.
323 */
324 if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) {
325 ret = -EINVAL;
326 rdt_last_cmd_puts("Resource group is pseudo-locked\n");
327 goto out;
328 }
329
330 for_each_alloc_enabled_rdt_resource(r) {
331 list_for_each_entry(dom, &r->domains, list)
332 dom->have_new_ctrl = false;
333 }
334
335 while ((tok = strsep(&buf, "\n")) != NULL) {
336 resname = strim(strsep(&tok, ":"));
337 if (!tok) {
338 rdt_last_cmd_puts("Missing ':'\n");
339 ret = -EINVAL;
340 goto out;
341 }
342 if (tok[0] == '\0') {
343 rdt_last_cmd_printf("Missing '%s' value\n", resname);
344 ret = -EINVAL;
345 goto out;
346 }
347 ret = rdtgroup_parse_resource(resname, tok, rdtgrp);
348 if (ret)
349 goto out;
350 }
351
352 for_each_alloc_enabled_rdt_resource(r) {
353 ret = update_domains(r, rdtgrp->closid);
354 if (ret)
355 goto out;
356 }
357
358 if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
359 /*
360 * If pseudo-locking fails we keep the resource group in
361 * mode RDT_MODE_PSEUDO_LOCKSETUP with its class of service
362 * active and updated for just the domain the pseudo-locked
363 * region was requested for.
364 */
365 ret = rdtgroup_pseudo_lock_create(rdtgrp);
366 }
367
368out:
369 rdtgroup_kn_unlock(of->kn);
370 cpus_read_unlock();
371 return ret ?: nbytes;
372}
373
374static void show_doms(struct seq_file *s, struct rdt_resource *r, int closid)
375{
376 struct rdt_domain *dom;
377 bool sep = false;
378 u32 ctrl_val;
379
380 seq_printf(s, "%*s:", max_name_width, r->name);
381 list_for_each_entry(dom, &r->domains, list) {
382 if (sep)
383 seq_puts(s, ";");
384
385 ctrl_val = (!is_mba_sc(r) ? dom->ctrl_val[closid] :
386 dom->mbps_val[closid]);
387 seq_printf(s, r->format_str, dom->id, max_data_width,
388 ctrl_val);
389 sep = true;
390 }
391 seq_puts(s, "\n");
392}
393
394int rdtgroup_schemata_show(struct kernfs_open_file *of,
395 struct seq_file *s, void *v)
396{
397 struct rdtgroup *rdtgrp;
398 struct rdt_resource *r;
399 int ret = 0;
400 u32 closid;
401
402 rdtgrp = rdtgroup_kn_lock_live(of->kn);
403 if (rdtgrp) {
404 if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
405 for_each_alloc_enabled_rdt_resource(r)
406 seq_printf(s, "%s:uninitialized\n", r->name);
407 } else if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) {
408 if (!rdtgrp->plr->d) {
409 rdt_last_cmd_clear();
410 rdt_last_cmd_puts("Cache domain offline\n");
411 ret = -ENODEV;
412 } else {
413 seq_printf(s, "%s:%d=%x\n",
414 rdtgrp->plr->r->name,
415 rdtgrp->plr->d->id,
416 rdtgrp->plr->cbm);
417 }
418 } else {
419 closid = rdtgrp->closid;
420 for_each_alloc_enabled_rdt_resource(r) {
421 if (closid < r->num_closid)
422 show_doms(s, r, closid);
423 }
424 }
425 } else {
426 ret = -ENOENT;
427 }
428 rdtgroup_kn_unlock(of->kn);
429 return ret;
430}
431
432void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
433 struct rdt_domain *d, struct rdtgroup *rdtgrp,
434 int evtid, int first)
435{
436 /*
437 * setup the parameters to send to the IPI to read the data.
438 */
439 rr->rgrp = rdtgrp;
440 rr->evtid = evtid;
441 rr->r = r;
442 rr->d = d;
443 rr->val = 0;
444 rr->first = first;
445
446 smp_call_function_any(&d->cpu_mask, mon_event_count, rr, 1);
447}
448
449int rdtgroup_mondata_show(struct seq_file *m, void *arg)
450{
451 struct kernfs_open_file *of = m->private;
452 u32 resid, evtid, domid;
453 struct rdtgroup *rdtgrp;
454 struct rdt_resource *r;
455 union mon_data_bits md;
456 struct rdt_domain *d;
457 struct rmid_read rr;
458 int ret = 0;
459
460 rdtgrp = rdtgroup_kn_lock_live(of->kn);
461 if (!rdtgrp) {
462 ret = -ENOENT;
463 goto out;
464 }
465
466 md.priv = of->kn->priv;
467 resid = md.u.rid;
468 domid = md.u.domid;
469 evtid = md.u.evtid;
470
471 r = &rdt_resources_all[resid];
472 d = rdt_find_domain(r, domid, NULL);
473 if (IS_ERR_OR_NULL(d)) {
474 ret = -ENOENT;
475 goto out;
476 }
477
478 mon_event_read(&rr, r, d, rdtgrp, evtid, false);
479
480 if (rr.val & RMID_VAL_ERROR)
481 seq_puts(m, "Error\n");
482 else if (rr.val & RMID_VAL_UNAVAIL)
483 seq_puts(m, "Unavailable\n");
484 else
485 seq_printf(m, "%llu\n", rr.val * r->mon_scale);
486
487out:
488 rdtgroup_kn_unlock(of->kn);
489 return ret;
490}