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Diffstat (limited to 'arch/x86/kernel/cpu/resctrl/ctrlmondata.c')
-rw-r--r--arch/x86/kernel/cpu/resctrl/ctrlmondata.c635
1 files changed, 0 insertions, 635 deletions
diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index 0a0ac5f6112e..1189c0df4ad7 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -16,277 +16,9 @@
#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 <linux/tick.h>
#include "internal.h"
-struct rdt_parse_data {
- struct rdtgroup *rdtgrp;
- char *buf;
-};
-
-typedef int (ctrlval_parser_t)(struct rdt_parse_data *data,
- struct resctrl_schema *s,
- struct rdt_ctrl_domain *d);
-
-/*
- * 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, u32 *data, struct rdt_resource *r)
-{
- int ret;
- u32 bw;
-
- /*
- * 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 = kstrtou32(buf, 10, &bw);
- if (ret) {
- rdt_last_cmd_printf("Invalid MB value %s\n", buf);
- return false;
- }
-
- /* Nothing else to do if software controller is enabled. */
- if (is_mba_sc(r)) {
- *data = bw;
- return true;
- }
-
- if (bw < r->membw.min_bw || bw > r->membw.max_bw) {
- rdt_last_cmd_printf("MB value %u out of range [%d,%d]\n",
- bw, r->membw.min_bw, r->membw.max_bw);
- return false;
- }
-
- *data = roundup(bw, (unsigned long)r->membw.bw_gran);
- return true;
-}
-
-static int parse_bw(struct rdt_parse_data *data, struct resctrl_schema *s,
- struct rdt_ctrl_domain *d)
-{
- struct resctrl_staged_config *cfg;
- u32 closid = data->rdtgrp->closid;
- struct rdt_resource *r = s->res;
- u32 bw_val;
-
- cfg = &d->staged_config[s->conf_type];
- if (cfg->have_new_ctrl) {
- rdt_last_cmd_printf("Duplicate domain %d\n", d->hdr.id);
- return -EINVAL;
- }
-
- if (!bw_validate(data->buf, &bw_val, r))
- return -EINVAL;
-
- if (is_mba_sc(r)) {
- d->mbps_val[closid] = bw_val;
- return 0;
- }
-
- cfg->new_ctrl = bw_val;
- cfg->have_new_ctrl = true;
-
- return 0;
-}
-
-/*
- * Check whether a cache bit mask is valid.
- * On Intel CPUs, non-contiguous 1s value support is indicated by CPUID:
- * - CPUID.0x10.1:ECX[3]: L3 non-contiguous 1s value supported if 1
- * - CPUID.0x10.2:ECX[3]: L2 non-contiguous 1s value supported if 1
- *
- * Haswell does not support a non-contiguous 1s value and additionally
- * requires at least two bits set.
- * AMD allows non-contiguous bitmasks.
- */
-static bool cbm_validate(char *buf, u32 *data, struct rdt_resource *r)
-{
- u32 supported_bits = BIT_MASK(r->cache.cbm_len) - 1;
- unsigned int cbm_len = r->cache.cbm_len;
- unsigned long first_bit, zero_bit, val;
- 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.min_cbm_bits > 0 && val == 0) || val > supported_bits) {
- 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 bitmasks allowed? */
- if (!r->cache.arch_has_sparse_bitmasks &&
- (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.
- */
-static int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
- struct rdt_ctrl_domain *d)
-{
- struct rdtgroup *rdtgrp = data->rdtgrp;
- struct resctrl_staged_config *cfg;
- struct rdt_resource *r = s->res;
- u32 cbm_val;
-
- cfg = &d->staged_config[s->conf_type];
- if (cfg->have_new_ctrl) {
- rdt_last_cmd_printf("Duplicate domain %d\n", d->hdr.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(s, d, cbm_val, rdtgrp->closid, true)) {
- rdt_last_cmd_puts("Overlaps with exclusive group\n");
- return -EINVAL;
- }
-
- if (rdtgroup_cbm_overlaps(s, 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;
- }
- }
-
- cfg->new_ctrl = cbm_val;
- cfg->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 resctrl_schema *s,
- struct rdtgroup *rdtgrp)
-{
- enum resctrl_conf_type t = s->conf_type;
- ctrlval_parser_t *parse_ctrlval = NULL;
- struct resctrl_staged_config *cfg;
- struct rdt_resource *r = s->res;
- struct rdt_parse_data data;
- struct rdt_ctrl_domain *d;
- char *dom = NULL, *id;
- unsigned long dom_id;
-
- /* Walking r->domains, ensure it can't race with cpuhp */
- lockdep_assert_cpus_held();
-
- switch (r->schema_fmt) {
- case RESCTRL_SCHEMA_BITMAP:
- parse_ctrlval = &parse_cbm;
- break;
- case RESCTRL_SCHEMA_RANGE:
- parse_ctrlval = &parse_bw;
- break;
- }
-
- if (WARN_ON_ONCE(!parse_ctrlval))
- return -EINVAL;
-
- if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP &&
- (r->rid == RDT_RESOURCE_MBA || r->rid == RDT_RESOURCE_SMBA)) {
- 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->ctrl_domains, hdr.list) {
- if (d->hdr.id == dom_id) {
- data.buf = dom;
- data.rdtgrp = rdtgrp;
- if (parse_ctrlval(&data, s, d))
- return -EINVAL;
- if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
- cfg = &d->staged_config[t];
- /*
- * 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->s = s;
- rdtgrp->plr->d = d;
- rdtgrp->plr->cbm = cfg->new_ctrl;
- d->plr = rdtgrp->plr;
- return 0;
- }
- goto next;
- }
- }
- return -EINVAL;
-}
-
int resctrl_arch_update_one(struct rdt_resource *r, struct rdt_ctrl_domain *d,
u32 closid, enum resctrl_conf_type t, u32 cfg_val)
{
@@ -351,100 +83,6 @@ int resctrl_arch_update_domains(struct rdt_resource *r, u32 closid)
return 0;
}
-static int rdtgroup_parse_resource(char *resname, char *tok,
- struct rdtgroup *rdtgrp)
-{
- struct resctrl_schema *s;
-
- list_for_each_entry(s, &resctrl_schema_all, list) {
- if (!strcmp(resname, s->name) && rdtgrp->closid < s->num_closid)
- return parse_line(tok, s, 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 resctrl_schema *s;
- struct rdtgroup *rdtgrp;
- 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';
-
- rdtgrp = rdtgroup_kn_lock_live(of->kn);
- if (!rdtgrp) {
- rdtgroup_kn_unlock(of->kn);
- 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;
- }
-
- rdt_staged_configs_clear();
-
- 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;
- }
-
- list_for_each_entry(s, &resctrl_schema_all, list) {
- r = s->res;
-
- /*
- * Writes to mba_sc resources update the software controller,
- * not the control MSR.
- */
- if (is_mba_sc(r))
- continue;
-
- ret = resctrl_arch_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:
- rdt_staged_configs_clear();
- rdtgroup_kn_unlock(of->kn);
- return ret ?: nbytes;
-}
-
u32 resctrl_arch_get_config(struct rdt_resource *r, struct rdt_ctrl_domain *d,
u32 closid, enum resctrl_conf_type type)
{
@@ -453,276 +91,3 @@ u32 resctrl_arch_get_config(struct rdt_resource *r, struct rdt_ctrl_domain *d,
return hw_dom->ctrl_val[idx];
}
-
-static void show_doms(struct seq_file *s, struct resctrl_schema *schema, int closid)
-{
- struct rdt_resource *r = schema->res;
- struct rdt_ctrl_domain *dom;
- bool sep = false;
- u32 ctrl_val;
-
- /* Walking r->domains, ensure it can't race with cpuhp */
- lockdep_assert_cpus_held();
-
- seq_printf(s, "%*s:", max_name_width, schema->name);
- list_for_each_entry(dom, &r->ctrl_domains, hdr.list) {
- if (sep)
- seq_puts(s, ";");
-
- if (is_mba_sc(r))
- ctrl_val = dom->mbps_val[closid];
- else
- ctrl_val = resctrl_arch_get_config(r, dom, closid,
- schema->conf_type);
-
- seq_printf(s, schema->fmt_str, dom->hdr.id, ctrl_val);
- sep = true;
- }
- seq_puts(s, "\n");
-}
-
-int rdtgroup_schemata_show(struct kernfs_open_file *of,
- struct seq_file *s, void *v)
-{
- struct resctrl_schema *schema;
- struct rdtgroup *rdtgrp;
- int ret = 0;
- u32 closid;
-
- rdtgrp = rdtgroup_kn_lock_live(of->kn);
- if (rdtgrp) {
- if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
- list_for_each_entry(schema, &resctrl_schema_all, list) {
- seq_printf(s, "%s:uninitialized\n", schema->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->s->res->name,
- rdtgrp->plr->d->hdr.id,
- rdtgrp->plr->cbm);
- }
- } else {
- closid = rdtgrp->closid;
- 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;
-}
-
-static int smp_mon_event_count(void *arg)
-{
- mon_event_count(arg);
-
- return 0;
-}
-
-ssize_t rdtgroup_mba_mbps_event_write(struct kernfs_open_file *of,
- char *buf, size_t nbytes, loff_t off)
-{
- struct rdtgroup *rdtgrp;
- int ret = 0;
-
- /* Valid input requires a trailing newline */
- if (nbytes == 0 || buf[nbytes - 1] != '\n')
- return -EINVAL;
- buf[nbytes - 1] = '\0';
-
- rdtgrp = rdtgroup_kn_lock_live(of->kn);
- if (!rdtgrp) {
- rdtgroup_kn_unlock(of->kn);
- return -ENOENT;
- }
- rdt_last_cmd_clear();
-
- if (!strcmp(buf, "mbm_local_bytes")) {
- if (resctrl_arch_is_mbm_local_enabled())
- rdtgrp->mba_mbps_event = QOS_L3_MBM_LOCAL_EVENT_ID;
- else
- ret = -EINVAL;
- } else if (!strcmp(buf, "mbm_total_bytes")) {
- if (resctrl_arch_is_mbm_total_enabled())
- rdtgrp->mba_mbps_event = QOS_L3_MBM_TOTAL_EVENT_ID;
- else
- ret = -EINVAL;
- } else {
- ret = -EINVAL;
- }
-
- if (ret)
- rdt_last_cmd_printf("Unsupported event id '%s'\n", buf);
-
- rdtgroup_kn_unlock(of->kn);
-
- return ret ?: nbytes;
-}
-
-int rdtgroup_mba_mbps_event_show(struct kernfs_open_file *of,
- struct seq_file *s, void *v)
-{
- struct rdtgroup *rdtgrp;
- int ret = 0;
-
- rdtgrp = rdtgroup_kn_lock_live(of->kn);
-
- if (rdtgrp) {
- switch (rdtgrp->mba_mbps_event) {
- case QOS_L3_MBM_LOCAL_EVENT_ID:
- seq_puts(s, "mbm_local_bytes\n");
- break;
- case QOS_L3_MBM_TOTAL_EVENT_ID:
- seq_puts(s, "mbm_total_bytes\n");
- break;
- default:
- pr_warn_once("Bad event %d\n", rdtgrp->mba_mbps_event);
- ret = -EINVAL;
- break;
- }
- } else {
- ret = -ENOENT;
- }
-
- rdtgroup_kn_unlock(of->kn);
-
- return ret;
-}
-
-struct rdt_domain_hdr *resctrl_find_domain(struct list_head *h, int id,
- struct list_head **pos)
-{
- struct rdt_domain_hdr *d;
- struct list_head *l;
-
- list_for_each(l, h) {
- d = list_entry(l, struct rdt_domain_hdr, list);
- /* When id is found, return its domain. */
- if (id == d->id)
- return d;
- /* Stop searching when finding id's position in sorted list. */
- if (id < d->id)
- break;
- }
-
- if (pos)
- *pos = l;
-
- return NULL;
-}
-
-void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
- struct rdt_mon_domain *d, struct rdtgroup *rdtgrp,
- cpumask_t *cpumask, int evtid, int first)
-{
- int cpu;
-
- /* When picking a CPU from cpu_mask, ensure it can't race with cpuhp */
- lockdep_assert_cpus_held();
-
- /*
- * Setup the parameters to pass to mon_event_count() to read the data.
- */
- rr->rgrp = rdtgrp;
- rr->evtid = evtid;
- rr->r = r;
- rr->d = d;
- rr->first = first;
- rr->arch_mon_ctx = resctrl_arch_mon_ctx_alloc(r, evtid);
- if (IS_ERR(rr->arch_mon_ctx)) {
- rr->err = -EINVAL;
- return;
- }
-
- cpu = cpumask_any_housekeeping(cpumask, RESCTRL_PICK_ANY_CPU);
-
- /*
- * cpumask_any_housekeeping() prefers housekeeping CPUs, but
- * are all the CPUs nohz_full? If yes, pick a CPU to IPI.
- * MPAM's resctrl_arch_rmid_read() is unable to read the
- * counters on some platforms if its called in IRQ context.
- */
- if (tick_nohz_full_cpu(cpu))
- smp_call_function_any(cpumask, mon_event_count, rr, 1);
- else
- smp_call_on_cpu(cpu, smp_mon_event_count, rr, false);
-
- resctrl_arch_mon_ctx_free(r, evtid, rr->arch_mon_ctx);
-}
-
-int rdtgroup_mondata_show(struct seq_file *m, void *arg)
-{
- struct kernfs_open_file *of = m->private;
- struct rdt_domain_hdr *hdr;
- struct rmid_read rr = {0};
- struct rdt_mon_domain *d;
- u32 resid, evtid, domid;
- struct rdtgroup *rdtgrp;
- struct rdt_resource *r;
- union mon_data_bits md;
- 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 = resctrl_arch_get_resource(resid);
-
- if (md.u.sum) {
- /*
- * This file requires summing across all domains that share
- * the L3 cache id that was provided in the "domid" field of the
- * mon_data_bits union. Search all domains in the resource for
- * one that matches this cache id.
- */
- list_for_each_entry(d, &r->mon_domains, hdr.list) {
- if (d->ci->id == domid) {
- rr.ci = d->ci;
- mon_event_read(&rr, r, NULL, rdtgrp,
- &d->ci->shared_cpu_map, evtid, false);
- goto checkresult;
- }
- }
- ret = -ENOENT;
- goto out;
- } else {
- /*
- * This file provides data from a single domain. Search
- * the resource to find the domain with "domid".
- */
- hdr = resctrl_find_domain(&r->mon_domains, domid, NULL);
- if (!hdr || WARN_ON_ONCE(hdr->type != RESCTRL_MON_DOMAIN)) {
- ret = -ENOENT;
- goto out;
- }
- d = container_of(hdr, struct rdt_mon_domain, hdr);
- mon_event_read(&rr, r, d, rdtgrp, &d->hdr.cpu_mask, evtid, false);
- }
-
-checkresult:
-
- if (rr.err == -EIO)
- seq_puts(m, "Error\n");
- else if (rr.err == -EINVAL)
- seq_puts(m, "Unavailable\n");
- else
- seq_printf(m, "%llu\n", rr.val);
-
-out:
- rdtgroup_kn_unlock(of->kn);
- return ret;
-}
generated by cgit (git 2.34.1) at 2025-05-29 17:46:45 +0000