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-rw-r--r--arch/x86/kernel/cpu/resctrl/ctrlmondata.c490
1 files changed, 490 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
new file mode 100644
index 000000000..c877642e8
--- /dev/null
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -0,0 +1,490 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Resource Director Technology(RDT)
+ * - Cache Allocation code.
+ *
+ * Copyright (C) 2016 Intel Corporation
+ *
+ * Authors:
+ * Fenghua Yu <fenghua.yu@intel.com>
+ * Tony Luck <tony.luck@intel.com>
+ *
+ * More information about RDT be found in the Intel (R) x86 Architecture
+ * Software Developer Manual June 2016, volume 3, section 17.17.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/cpu.h>
+#include <linux/kernfs.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include "internal.h"
+
+/*
+ * Check whether MBA bandwidth percentage value is correct. The value is
+ * checked against the minimum and max bandwidth values specified by the
+ * hardware. The allocated bandwidth percentage is rounded to the next
+ * control step available on the hardware.
+ */
+static bool bw_validate(char *buf, unsigned long *data, struct rdt_resource *r)
+{
+ unsigned long bw;
+ int ret;
+
+ /*
+ * Only linear delay values is supported for current Intel SKUs.
+ */
+ if (!r->membw.delay_linear && r->membw.arch_needs_linear) {
+ rdt_last_cmd_puts("No support for non-linear MB domains\n");
+ return false;
+ }
+
+ ret = kstrtoul(buf, 10, &bw);
+ if (ret) {
+ rdt_last_cmd_printf("Non-decimal digit in MB value %s\n", buf);
+ return false;
+ }
+
+ if ((bw < r->membw.min_bw || bw > r->default_ctrl) &&
+ !is_mba_sc(r)) {
+ rdt_last_cmd_printf("MB value %ld out of range [%d,%d]\n", bw,
+ r->membw.min_bw, r->default_ctrl);
+ return false;
+ }
+
+ *data = roundup(bw, (unsigned long)r->membw.bw_gran);
+ return true;
+}
+
+int parse_bw(struct rdt_parse_data *data, struct rdt_resource *r,
+ struct rdt_domain *d)
+{
+ unsigned long bw_val;
+
+ if (d->have_new_ctrl) {
+ rdt_last_cmd_printf("Duplicate domain %d\n", d->id);
+ return -EINVAL;
+ }
+
+ if (!bw_validate(data->buf, &bw_val, r))
+ return -EINVAL;
+ d->new_ctrl = bw_val;
+ d->have_new_ctrl = true;
+
+ return 0;
+}
+
+/*
+ * Check whether a cache bit mask is valid.
+ * For Intel the SDM says:
+ * Please note that all (and only) contiguous '1' combinations
+ * are allowed (e.g. FFFFH, 0FF0H, 003CH, etc.).
+ * Additionally Haswell requires at least two bits set.
+ * AMD allows non-contiguous bitmasks.
+ */
+static bool cbm_validate(char *buf, u32 *data, struct rdt_resource *r)
+{
+ unsigned long first_bit, zero_bit, val;
+ unsigned int cbm_len = r->cache.cbm_len;
+ int ret;
+
+ ret = kstrtoul(buf, 16, &val);
+ if (ret) {
+ rdt_last_cmd_printf("Non-hex character in the mask %s\n", buf);
+ return false;
+ }
+
+ if ((!r->cache.arch_has_empty_bitmaps && val == 0) ||
+ val > r->default_ctrl) {
+ rdt_last_cmd_puts("Mask out of range\n");
+ return false;
+ }
+
+ first_bit = find_first_bit(&val, cbm_len);
+ zero_bit = find_next_zero_bit(&val, cbm_len, first_bit);
+
+ /* Are non-contiguous bitmaps allowed? */
+ if (!r->cache.arch_has_sparse_bitmaps &&
+ (find_next_bit(&val, cbm_len, zero_bit) < cbm_len)) {
+ rdt_last_cmd_printf("The mask %lx has non-consecutive 1-bits\n", val);
+ return false;
+ }
+
+ if ((zero_bit - first_bit) < r->cache.min_cbm_bits) {
+ rdt_last_cmd_printf("Need at least %d bits in the mask\n",
+ r->cache.min_cbm_bits);
+ return false;
+ }
+
+ *data = val;
+ return true;
+}
+
+/*
+ * Read one cache bit mask (hex). Check that it is valid for the current
+ * resource type.
+ */
+int parse_cbm(struct rdt_parse_data *data, struct rdt_resource *r,
+ struct rdt_domain *d)
+{
+ struct rdtgroup *rdtgrp = data->rdtgrp;
+ u32 cbm_val;
+
+ if (d->have_new_ctrl) {
+ rdt_last_cmd_printf("Duplicate domain %d\n", d->id);
+ return -EINVAL;
+ }
+
+ /*
+ * Cannot set up more than one pseudo-locked region in a cache
+ * hierarchy.
+ */
+ if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP &&
+ rdtgroup_pseudo_locked_in_hierarchy(d)) {
+ rdt_last_cmd_puts("Pseudo-locked region in hierarchy\n");
+ return -EINVAL;
+ }
+
+ if (!cbm_validate(data->buf, &cbm_val, r))
+ return -EINVAL;
+
+ if ((rdtgrp->mode == RDT_MODE_EXCLUSIVE ||
+ rdtgrp->mode == RDT_MODE_SHAREABLE) &&
+ rdtgroup_cbm_overlaps_pseudo_locked(d, cbm_val)) {
+ rdt_last_cmd_puts("CBM overlaps with pseudo-locked region\n");
+ return -EINVAL;
+ }
+
+ /*
+ * The CBM may not overlap with the CBM of another closid if
+ * either is exclusive.
+ */
+ if (rdtgroup_cbm_overlaps(r, d, cbm_val, rdtgrp->closid, true)) {
+ rdt_last_cmd_puts("Overlaps with exclusive group\n");
+ return -EINVAL;
+ }
+
+ if (rdtgroup_cbm_overlaps(r, d, cbm_val, rdtgrp->closid, false)) {
+ if (rdtgrp->mode == RDT_MODE_EXCLUSIVE ||
+ rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
+ rdt_last_cmd_puts("Overlaps with other group\n");
+ return -EINVAL;
+ }
+ }
+
+ d->new_ctrl = cbm_val;
+ d->have_new_ctrl = true;
+
+ return 0;
+}
+
+/*
+ * For each domain in this resource we expect to find a series of:
+ * id=mask
+ * separated by ";". The "id" is in decimal, and must match one of
+ * the "id"s for this resource.
+ */
+static int parse_line(char *line, struct rdt_resource *r,
+ struct rdtgroup *rdtgrp)
+{
+ struct rdt_parse_data data;
+ char *dom = NULL, *id;
+ struct rdt_domain *d;
+ unsigned long dom_id;
+
+ if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP &&
+ r->rid == RDT_RESOURCE_MBA) {
+ rdt_last_cmd_puts("Cannot pseudo-lock MBA resource\n");
+ return -EINVAL;
+ }
+
+next:
+ if (!line || line[0] == '\0')
+ return 0;
+ dom = strsep(&line, ";");
+ id = strsep(&dom, "=");
+ if (!dom || kstrtoul(id, 10, &dom_id)) {
+ rdt_last_cmd_puts("Missing '=' or non-numeric domain\n");
+ return -EINVAL;
+ }
+ dom = strim(dom);
+ list_for_each_entry(d, &r->domains, list) {
+ if (d->id == dom_id) {
+ data.buf = dom;
+ data.rdtgrp = rdtgrp;
+ if (r->parse_ctrlval(&data, r, d))
+ return -EINVAL;
+ if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
+ /*
+ * In pseudo-locking setup mode and just
+ * parsed a valid CBM that should be
+ * pseudo-locked. Only one locked region per
+ * resource group and domain so just do
+ * the required initialization for single
+ * region and return.
+ */
+ rdtgrp->plr->r = r;
+ rdtgrp->plr->d = d;
+ rdtgrp->plr->cbm = d->new_ctrl;
+ d->plr = rdtgrp->plr;
+ return 0;
+ }
+ goto next;
+ }
+ }
+ return -EINVAL;
+}
+
+int update_domains(struct rdt_resource *r, int closid)
+{
+ struct msr_param msr_param;
+ cpumask_var_t cpu_mask;
+ struct rdt_domain *d;
+ bool mba_sc;
+ u32 *dc;
+ int cpu;
+
+ if (!zalloc_cpumask_var(&cpu_mask, GFP_KERNEL))
+ return -ENOMEM;
+
+ msr_param.low = closid;
+ msr_param.high = msr_param.low + 1;
+ msr_param.res = r;
+
+ mba_sc = is_mba_sc(r);
+ list_for_each_entry(d, &r->domains, list) {
+ dc = !mba_sc ? d->ctrl_val : d->mbps_val;
+ if (d->have_new_ctrl && d->new_ctrl != dc[closid]) {
+ cpumask_set_cpu(cpumask_any(&d->cpu_mask), cpu_mask);
+ dc[closid] = d->new_ctrl;
+ }
+ }
+
+ /*
+ * Avoid writing the control msr with control values when
+ * MBA software controller is enabled
+ */
+ if (cpumask_empty(cpu_mask) || mba_sc)
+ goto done;
+ cpu = get_cpu();
+ /* Update resource control msr on this CPU if it's in cpu_mask. */
+ if (cpumask_test_cpu(cpu, cpu_mask))
+ rdt_ctrl_update(&msr_param);
+ /* Update resource control msr on other CPUs. */
+ smp_call_function_many(cpu_mask, rdt_ctrl_update, &msr_param, 1);
+ put_cpu();
+
+done:
+ free_cpumask_var(cpu_mask);
+
+ return 0;
+}
+
+static int rdtgroup_parse_resource(char *resname, char *tok,
+ struct rdtgroup *rdtgrp)
+{
+ struct rdt_resource *r;
+
+ for_each_alloc_enabled_rdt_resource(r) {
+ if (!strcmp(resname, r->name) && rdtgrp->closid < r->num_closid)
+ return parse_line(tok, r, rdtgrp);
+ }
+ rdt_last_cmd_printf("Unknown or unsupported resource name '%s'\n", resname);
+ return -EINVAL;
+}
+
+ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
+ char *buf, size_t nbytes, loff_t off)
+{
+ struct rdtgroup *rdtgrp;
+ struct rdt_domain *dom;
+ struct rdt_resource *r;
+ char *tok, *resname;
+ int ret = 0;
+
+ /* Valid input requires a trailing newline */
+ if (nbytes == 0 || buf[nbytes - 1] != '\n')
+ return -EINVAL;
+ buf[nbytes - 1] = '\0';
+
+ cpus_read_lock();
+ rdtgrp = rdtgroup_kn_lock_live(of->kn);
+ if (!rdtgrp) {
+ rdtgroup_kn_unlock(of->kn);
+ cpus_read_unlock();
+ return -ENOENT;
+ }
+ rdt_last_cmd_clear();
+
+ /*
+ * No changes to pseudo-locked region allowed. It has to be removed
+ * and re-created instead.
+ */
+ if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) {
+ ret = -EINVAL;
+ rdt_last_cmd_puts("Resource group is pseudo-locked\n");
+ goto out;
+ }
+
+ for_each_alloc_enabled_rdt_resource(r) {
+ list_for_each_entry(dom, &r->domains, list)
+ dom->have_new_ctrl = false;
+ }
+
+ while ((tok = strsep(&buf, "\n")) != NULL) {
+ resname = strim(strsep(&tok, ":"));
+ if (!tok) {
+ rdt_last_cmd_puts("Missing ':'\n");
+ ret = -EINVAL;
+ goto out;
+ }
+ if (tok[0] == '\0') {
+ rdt_last_cmd_printf("Missing '%s' value\n", resname);
+ ret = -EINVAL;
+ goto out;
+ }
+ ret = rdtgroup_parse_resource(resname, tok, rdtgrp);
+ if (ret)
+ goto out;
+ }
+
+ for_each_alloc_enabled_rdt_resource(r) {
+ ret = update_domains(r, rdtgrp->closid);
+ if (ret)
+ goto out;
+ }
+
+ if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
+ /*
+ * If pseudo-locking fails we keep the resource group in
+ * mode RDT_MODE_PSEUDO_LOCKSETUP with its class of service
+ * active and updated for just the domain the pseudo-locked
+ * region was requested for.
+ */
+ ret = rdtgroup_pseudo_lock_create(rdtgrp);
+ }
+
+out:
+ rdtgroup_kn_unlock(of->kn);
+ cpus_read_unlock();
+ return ret ?: nbytes;
+}
+
+static void show_doms(struct seq_file *s, struct rdt_resource *r, int closid)
+{
+ struct rdt_domain *dom;
+ bool sep = false;
+ u32 ctrl_val;
+
+ seq_printf(s, "%*s:", max_name_width, r->name);
+ list_for_each_entry(dom, &r->domains, list) {
+ if (sep)
+ seq_puts(s, ";");
+
+ ctrl_val = (!is_mba_sc(r) ? dom->ctrl_val[closid] :
+ dom->mbps_val[closid]);
+ seq_printf(s, r->format_str, dom->id, max_data_width,
+ ctrl_val);
+ sep = true;
+ }
+ seq_puts(s, "\n");
+}
+
+int rdtgroup_schemata_show(struct kernfs_open_file *of,
+ struct seq_file *s, void *v)
+{
+ struct rdtgroup *rdtgrp;
+ struct rdt_resource *r;
+ int ret = 0;
+ u32 closid;
+
+ rdtgrp = rdtgroup_kn_lock_live(of->kn);
+ if (rdtgrp) {
+ if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
+ for_each_alloc_enabled_rdt_resource(r)
+ seq_printf(s, "%s:uninitialized\n", r->name);
+ } else if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKED) {
+ if (!rdtgrp->plr->d) {
+ rdt_last_cmd_clear();
+ rdt_last_cmd_puts("Cache domain offline\n");
+ ret = -ENODEV;
+ } else {
+ seq_printf(s, "%s:%d=%x\n",
+ rdtgrp->plr->r->name,
+ rdtgrp->plr->d->id,
+ rdtgrp->plr->cbm);
+ }
+ } else {
+ closid = rdtgrp->closid;
+ for_each_alloc_enabled_rdt_resource(r) {
+ if (closid < r->num_closid)
+ show_doms(s, r, 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;
+ 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;
+
+ r = &rdt_resources_all[resid];
+ 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 * r->mon_scale);
+
+out:
+ rdtgroup_kn_unlock(of->kn);
+ return ret;
+}
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