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111136e69c
resctrl_arch_get_config() has no return, but does pass a single value back via one of its arguments. Return the value instead. Suggested-by: Borislav Petkov <bp@alien8.de> Signed-off-by: James Morse <james.morse@arm.com> Signed-off-by: Borislav Petkov <bp@suse.de> Link: https://lkml.kernel.org/r/20210811163831.14917-1-james.morse@arm.com
562 lines
14 KiB
C
562 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Resource Director Technology(RDT)
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* - Cache Allocation code.
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*
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* Copyright (C) 2016 Intel Corporation
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*
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* Authors:
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* Fenghua Yu <fenghua.yu@intel.com>
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* Tony Luck <tony.luck@intel.com>
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*
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* More information about RDT be found in the Intel (R) x86 Architecture
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* Software Developer Manual June 2016, volume 3, section 17.17.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/cpu.h>
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#include <linux/kernfs.h>
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#include <linux/seq_file.h>
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#include <linux/slab.h>
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#include "internal.h"
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/*
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* Check whether MBA bandwidth percentage value is correct. The value is
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* checked against the minimum and max bandwidth values specified by the
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* hardware. The allocated bandwidth percentage is rounded to the next
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* control step available on the hardware.
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*/
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static bool bw_validate(char *buf, unsigned long *data, struct rdt_resource *r)
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{
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unsigned long bw;
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int ret;
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/*
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* Only linear delay values is supported for current Intel SKUs.
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*/
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if (!r->membw.delay_linear && r->membw.arch_needs_linear) {
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rdt_last_cmd_puts("No support for non-linear MB domains\n");
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return false;
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}
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ret = kstrtoul(buf, 10, &bw);
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if (ret) {
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rdt_last_cmd_printf("Non-decimal digit in MB value %s\n", buf);
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return false;
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}
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if ((bw < r->membw.min_bw || bw > r->default_ctrl) &&
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!is_mba_sc(r)) {
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rdt_last_cmd_printf("MB value %ld out of range [%d,%d]\n", bw,
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r->membw.min_bw, r->default_ctrl);
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return false;
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}
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*data = roundup(bw, (unsigned long)r->membw.bw_gran);
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return true;
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}
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int parse_bw(struct rdt_parse_data *data, struct resctrl_schema *s,
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struct rdt_domain *d)
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{
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struct resctrl_staged_config *cfg;
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struct rdt_resource *r = s->res;
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unsigned long bw_val;
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cfg = &d->staged_config[s->conf_type];
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if (cfg->have_new_ctrl) {
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rdt_last_cmd_printf("Duplicate domain %d\n", d->id);
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return -EINVAL;
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}
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if (!bw_validate(data->buf, &bw_val, r))
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return -EINVAL;
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cfg->new_ctrl = bw_val;
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cfg->have_new_ctrl = true;
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return 0;
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}
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/*
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* Check whether a cache bit mask is valid.
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* For Intel the SDM says:
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* Please note that all (and only) contiguous '1' combinations
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* are allowed (e.g. FFFFH, 0FF0H, 003CH, etc.).
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* Additionally Haswell requires at least two bits set.
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* AMD allows non-contiguous bitmasks.
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*/
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static bool cbm_validate(char *buf, u32 *data, struct rdt_resource *r)
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{
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unsigned long first_bit, zero_bit, val;
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unsigned int cbm_len = r->cache.cbm_len;
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int ret;
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ret = kstrtoul(buf, 16, &val);
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if (ret) {
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rdt_last_cmd_printf("Non-hex character in the mask %s\n", buf);
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return false;
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}
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if ((!r->cache.arch_has_empty_bitmaps && val == 0) ||
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val > r->default_ctrl) {
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rdt_last_cmd_puts("Mask out of range\n");
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return false;
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}
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first_bit = find_first_bit(&val, cbm_len);
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zero_bit = find_next_zero_bit(&val, cbm_len, first_bit);
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/* Are non-contiguous bitmaps allowed? */
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if (!r->cache.arch_has_sparse_bitmaps &&
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(find_next_bit(&val, cbm_len, zero_bit) < cbm_len)) {
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rdt_last_cmd_printf("The mask %lx has non-consecutive 1-bits\n", val);
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return false;
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}
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if ((zero_bit - first_bit) < r->cache.min_cbm_bits) {
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rdt_last_cmd_printf("Need at least %d bits in the mask\n",
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r->cache.min_cbm_bits);
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return false;
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}
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*data = val;
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return true;
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}
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/*
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* Read one cache bit mask (hex). Check that it is valid for the current
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* resource type.
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*/
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int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
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struct rdt_domain *d)
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{
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struct rdtgroup *rdtgrp = data->rdtgrp;
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struct resctrl_staged_config *cfg;
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struct rdt_resource *r = s->res;
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u32 cbm_val;
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cfg = &d->staged_config[s->conf_type];
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if (cfg->have_new_ctrl) {
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rdt_last_cmd_printf("Duplicate domain %d\n", d->id);
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return -EINVAL;
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}
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/*
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* Cannot set up more than one pseudo-locked region in a cache
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* hierarchy.
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*/
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if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP &&
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rdtgroup_pseudo_locked_in_hierarchy(d)) {
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rdt_last_cmd_puts("Pseudo-locked region in hierarchy\n");
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return -EINVAL;
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}
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if (!cbm_validate(data->buf, &cbm_val, r))
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return -EINVAL;
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if ((rdtgrp->mode == RDT_MODE_EXCLUSIVE ||
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rdtgrp->mode == RDT_MODE_SHAREABLE) &&
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rdtgroup_cbm_overlaps_pseudo_locked(d, cbm_val)) {
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rdt_last_cmd_puts("CBM overlaps with pseudo-locked region\n");
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return -EINVAL;
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}
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/*
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* The CBM may not overlap with the CBM of another closid if
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* either is exclusive.
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*/
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if (rdtgroup_cbm_overlaps(s, d, cbm_val, rdtgrp->closid, true)) {
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rdt_last_cmd_puts("Overlaps with exclusive group\n");
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return -EINVAL;
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}
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if (rdtgroup_cbm_overlaps(s, d, cbm_val, rdtgrp->closid, false)) {
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if (rdtgrp->mode == RDT_MODE_EXCLUSIVE ||
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rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
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rdt_last_cmd_puts("Overlaps with other group\n");
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return -EINVAL;
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}
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}
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cfg->new_ctrl = cbm_val;
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cfg->have_new_ctrl = true;
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return 0;
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}
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/*
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* For each domain in this resource we expect to find a series of:
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* id=mask
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* separated by ";". The "id" is in decimal, and must match one of
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* the "id"s for this resource.
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*/
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static int parse_line(char *line, struct resctrl_schema *s,
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struct rdtgroup *rdtgrp)
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{
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enum resctrl_conf_type t = s->conf_type;
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struct resctrl_staged_config *cfg;
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struct rdt_resource *r = s->res;
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struct rdt_parse_data data;
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char *dom = NULL, *id;
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struct rdt_domain *d;
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unsigned long dom_id;
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if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP &&
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r->rid == RDT_RESOURCE_MBA) {
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rdt_last_cmd_puts("Cannot pseudo-lock MBA resource\n");
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return -EINVAL;
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}
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next:
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if (!line || line[0] == '\0')
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return 0;
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dom = strsep(&line, ";");
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id = strsep(&dom, "=");
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if (!dom || kstrtoul(id, 10, &dom_id)) {
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rdt_last_cmd_puts("Missing '=' or non-numeric domain\n");
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return -EINVAL;
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}
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dom = strim(dom);
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list_for_each_entry(d, &r->domains, list) {
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if (d->id == dom_id) {
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data.buf = dom;
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data.rdtgrp = rdtgrp;
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if (r->parse_ctrlval(&data, s, d))
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return -EINVAL;
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if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
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cfg = &d->staged_config[t];
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/*
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* In pseudo-locking setup mode and just
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* parsed a valid CBM that should be
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* pseudo-locked. Only one locked region per
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* resource group and domain so just do
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* the required initialization for single
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* region and return.
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*/
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rdtgrp->plr->s = s;
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rdtgrp->plr->d = d;
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rdtgrp->plr->cbm = cfg->new_ctrl;
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d->plr = rdtgrp->plr;
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return 0;
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}
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goto next;
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}
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}
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return -EINVAL;
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}
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static u32 get_config_index(u32 closid, enum resctrl_conf_type type)
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{
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switch (type) {
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default:
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case CDP_NONE:
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return closid;
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case CDP_CODE:
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return closid * 2 + 1;
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case CDP_DATA:
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return closid * 2;
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}
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}
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static bool apply_config(struct rdt_hw_domain *hw_dom,
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struct resctrl_staged_config *cfg, u32 idx,
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cpumask_var_t cpu_mask, bool mba_sc)
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{
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struct rdt_domain *dom = &hw_dom->d_resctrl;
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u32 *dc = !mba_sc ? hw_dom->ctrl_val : hw_dom->mbps_val;
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if (cfg->new_ctrl != dc[idx]) {
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cpumask_set_cpu(cpumask_any(&dom->cpu_mask), cpu_mask);
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dc[idx] = cfg->new_ctrl;
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return true;
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}
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return false;
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}
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int resctrl_arch_update_domains(struct rdt_resource *r, u32 closid)
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{
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struct resctrl_staged_config *cfg;
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struct rdt_hw_domain *hw_dom;
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struct msr_param msr_param;
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enum resctrl_conf_type t;
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cpumask_var_t cpu_mask;
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struct rdt_domain *d;
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bool mba_sc;
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int cpu;
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u32 idx;
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if (!zalloc_cpumask_var(&cpu_mask, GFP_KERNEL))
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return -ENOMEM;
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mba_sc = is_mba_sc(r);
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msr_param.res = NULL;
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list_for_each_entry(d, &r->domains, list) {
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hw_dom = resctrl_to_arch_dom(d);
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for (t = 0; t < CDP_NUM_TYPES; t++) {
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cfg = &hw_dom->d_resctrl.staged_config[t];
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if (!cfg->have_new_ctrl)
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continue;
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idx = get_config_index(closid, t);
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if (!apply_config(hw_dom, cfg, idx, cpu_mask, mba_sc))
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continue;
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if (!msr_param.res) {
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msr_param.low = idx;
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msr_param.high = msr_param.low + 1;
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msr_param.res = r;
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} else {
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msr_param.low = min(msr_param.low, idx);
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msr_param.high = max(msr_param.high, idx + 1);
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}
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}
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}
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/*
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* Avoid writing the control msr with control values when
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* MBA software controller is enabled
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*/
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if (cpumask_empty(cpu_mask) || mba_sc)
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goto done;
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cpu = get_cpu();
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/* Update resource control msr on this CPU if it's in cpu_mask. */
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if (cpumask_test_cpu(cpu, cpu_mask))
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rdt_ctrl_update(&msr_param);
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/* Update resource control msr on other CPUs. */
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smp_call_function_many(cpu_mask, rdt_ctrl_update, &msr_param, 1);
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put_cpu();
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done:
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free_cpumask_var(cpu_mask);
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return 0;
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}
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static int rdtgroup_parse_resource(char *resname, char *tok,
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struct rdtgroup *rdtgrp)
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{
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struct resctrl_schema *s;
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list_for_each_entry(s, &resctrl_schema_all, list) {
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if (!strcmp(resname, s->name) && rdtgrp->closid < s->num_closid)
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return parse_line(tok, s, rdtgrp);
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}
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rdt_last_cmd_printf("Unknown or unsupported resource name '%s'\n", resname);
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return -EINVAL;
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}
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ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
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char *buf, size_t nbytes, loff_t off)
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{
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struct resctrl_schema *s;
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struct rdtgroup *rdtgrp;
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struct rdt_domain *dom;
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struct rdt_resource *r;
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char *tok, *resname;
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int ret = 0;
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/* Valid input requires a trailing newline */
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if (nbytes == 0 || buf[nbytes - 1] != '\n')
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return -EINVAL;
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buf[nbytes - 1] = '\0';
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cpus_read_lock();
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rdtgrp = rdtgroup_kn_lock_live(of->kn);
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if (!rdtgrp) {
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rdtgroup_kn_unlock(of->kn);
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cpus_read_unlock();
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return -ENOENT;
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}
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rdt_last_cmd_clear();
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/*
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* No changes to pseudo-locked region allowed. It has to be removed
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* and re-created instead.
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*/
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if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) {
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ret = -EINVAL;
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rdt_last_cmd_puts("Resource group is pseudo-locked\n");
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goto out;
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}
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list_for_each_entry(s, &resctrl_schema_all, list) {
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list_for_each_entry(dom, &s->res->domains, list)
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memset(dom->staged_config, 0, sizeof(dom->staged_config));
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}
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while ((tok = strsep(&buf, "\n")) != NULL) {
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resname = strim(strsep(&tok, ":"));
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if (!tok) {
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rdt_last_cmd_puts("Missing ':'\n");
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ret = -EINVAL;
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goto out;
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}
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if (tok[0] == '\0') {
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rdt_last_cmd_printf("Missing '%s' value\n", resname);
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ret = -EINVAL;
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goto out;
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}
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ret = rdtgroup_parse_resource(resname, tok, rdtgrp);
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if (ret)
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goto out;
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}
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list_for_each_entry(s, &resctrl_schema_all, list) {
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r = s->res;
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ret = resctrl_arch_update_domains(r, rdtgrp->closid);
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if (ret)
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goto out;
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}
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if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
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/*
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* If pseudo-locking fails we keep the resource group in
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* mode RDT_MODE_PSEUDO_LOCKSETUP with its class of service
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* active and updated for just the domain the pseudo-locked
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* region was requested for.
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*/
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ret = rdtgroup_pseudo_lock_create(rdtgrp);
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}
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out:
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rdtgroup_kn_unlock(of->kn);
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cpus_read_unlock();
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return ret ?: nbytes;
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}
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u32 resctrl_arch_get_config(struct rdt_resource *r, struct rdt_domain *d,
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u32 closid, enum resctrl_conf_type type)
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{
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struct rdt_hw_domain *hw_dom = resctrl_to_arch_dom(d);
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u32 idx = get_config_index(closid, type);
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if (!is_mba_sc(r))
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return hw_dom->ctrl_val[idx];
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return hw_dom->mbps_val[idx];
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}
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static void show_doms(struct seq_file *s, struct resctrl_schema *schema, int closid)
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{
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struct rdt_resource *r = schema->res;
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struct rdt_domain *dom;
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bool sep = false;
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u32 ctrl_val;
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seq_printf(s, "%*s:", max_name_width, schema->name);
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list_for_each_entry(dom, &r->domains, list) {
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if (sep)
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seq_puts(s, ";");
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ctrl_val = resctrl_arch_get_config(r, dom, closid,
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schema->conf_type);
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seq_printf(s, r->format_str, dom->id, max_data_width,
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ctrl_val);
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sep = true;
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}
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seq_puts(s, "\n");
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}
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int rdtgroup_schemata_show(struct kernfs_open_file *of,
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struct seq_file *s, void *v)
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{
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struct resctrl_schema *schema;
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struct rdtgroup *rdtgrp;
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int ret = 0;
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u32 closid;
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rdtgrp = rdtgroup_kn_lock_live(of->kn);
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if (rdtgrp) {
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if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
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list_for_each_entry(schema, &resctrl_schema_all, list) {
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seq_printf(s, "%s:uninitialized\n", schema->name);
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}
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} else if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) {
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if (!rdtgrp->plr->d) {
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rdt_last_cmd_clear();
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rdt_last_cmd_puts("Cache domain offline\n");
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ret = -ENODEV;
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} else {
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seq_printf(s, "%s:%d=%x\n",
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rdtgrp->plr->s->res->name,
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rdtgrp->plr->d->id,
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rdtgrp->plr->cbm);
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}
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} else {
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closid = rdtgrp->closid;
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list_for_each_entry(schema, &resctrl_schema_all, list) {
|
|
if (closid < schema->num_closid)
|
|
show_doms(s, schema, closid);
|
|
}
|
|
}
|
|
} else {
|
|
ret = -ENOENT;
|
|
}
|
|
rdtgroup_kn_unlock(of->kn);
|
|
return ret;
|
|
}
|
|
|
|
void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
|
|
struct rdt_domain *d, struct rdtgroup *rdtgrp,
|
|
int evtid, int first)
|
|
{
|
|
/*
|
|
* setup the parameters to send to the IPI to read the data.
|
|
*/
|
|
rr->rgrp = rdtgrp;
|
|
rr->evtid = evtid;
|
|
rr->r = r;
|
|
rr->d = d;
|
|
rr->val = 0;
|
|
rr->first = first;
|
|
|
|
smp_call_function_any(&d->cpu_mask, mon_event_count, rr, 1);
|
|
}
|
|
|
|
int rdtgroup_mondata_show(struct seq_file *m, void *arg)
|
|
{
|
|
struct kernfs_open_file *of = m->private;
|
|
struct rdt_hw_resource *hw_res;
|
|
u32 resid, evtid, domid;
|
|
struct rdtgroup *rdtgrp;
|
|
struct rdt_resource *r;
|
|
union mon_data_bits md;
|
|
struct rdt_domain *d;
|
|
struct rmid_read rr;
|
|
int ret = 0;
|
|
|
|
rdtgrp = rdtgroup_kn_lock_live(of->kn);
|
|
if (!rdtgrp) {
|
|
ret = -ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
md.priv = of->kn->priv;
|
|
resid = md.u.rid;
|
|
domid = md.u.domid;
|
|
evtid = md.u.evtid;
|
|
|
|
hw_res = &rdt_resources_all[resid];
|
|
r = &hw_res->r_resctrl;
|
|
d = rdt_find_domain(r, domid, NULL);
|
|
if (IS_ERR_OR_NULL(d)) {
|
|
ret = -ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
mon_event_read(&rr, r, d, rdtgrp, evtid, false);
|
|
|
|
if (rr.val & RMID_VAL_ERROR)
|
|
seq_puts(m, "Error\n");
|
|
else if (rr.val & RMID_VAL_UNAVAIL)
|
|
seq_puts(m, "Unavailable\n");
|
|
else
|
|
seq_printf(m, "%llu\n", rr.val * hw_res->mon_scale);
|
|
|
|
out:
|
|
rdtgroup_kn_unlock(of->kn);
|
|
return ret;
|
|
}
|