[PATCH v2 13/24] x86/resctrl: Allow different CODE/DATA configurations to be staged

James Morse
2021-03-12T18:01:08Z

Now that the staged configuration is grouped as a single struct, convert
it to an array to allow resctrl to stage more than one configuration at
a time for a single resource and closid.

To detect that the same schema is being specified twice when the schemata
file is written, the same slot in the staged_configuration array must be
used for each schema. Use the conf_type enum directly as an index.

Reviewed-by: Jamie Iles <jamie@nuviainc.com>
Signed-off-by: James Morse <james.morse@arm.com>
---
Changes since v1:
* Renamed max enum value CDP_NUM_TYPES
* Whitespace and parenthesis
* Missing word in the commit message
---
arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 20 ++++++++++++++------
arch/x86/kernel/cpu/resctrl/rdtgroup.c | 5 +++--
include/linux/resctrl.h | 5 ++++-
3 files changed, 21 insertions(+), 9 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index a47a792fdcb3..c46300bce210 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -60,10 +60,11 @@ static bool bw_validate(char *buf, unsigned long *data, struct rdt_resource *r)
int parse_bw(struct rdt_parse_data *data, struct resctrl_schema *s,
struct rdt_domain *d)
{
+ struct resctrl_staged_config *cfg;
struct rdt_resource *r = s->res;
unsigned long bw_val;
- struct resctrl_staged_config *cfg = &d->staged_config;

+ cfg = &d->staged_config[s->conf_type];
if (cfg->have_new_ctrl) {
rdt_last_cmd_printf("Duplicate domain %d\n", d->id);
return -EINVAL;
@@ -130,11 +131,12 @@ static bool cbm_validate(char *buf, u32 *data, struct rdt_resource *r)
int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
struct rdt_domain *d)
{
- struct resctrl_staged_config *cfg = &d->staged_config;
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->id);
return -EINVAL;
@@ -192,6 +194,7 @@ int parse_cbm(struct rdt_parse_data *data, struct resctrl_schema *s,
static int parse_line(char *line, struct resctrl_schema *s,
struct rdtgroup *rdtgrp)
{
+ enum resctrl_conf_type t = s->conf_type;
struct resctrl_staged_config *cfg;
struct rdt_resource *r = s->res;
struct rdt_parse_data data;
@@ -222,7 +225,7 @@ static int parse_line(char *line, struct resctrl_schema *s,
if (r->parse_ctrlval(&data, s, d))
return -EINVAL;
if (rdtgrp->mode == RDT_MODE_PSEUDO_LOCKSETUP) {
- cfg = &d->staged_config;
+ cfg = &d->staged_config[t];
/*
* In pseudo-locking setup mode and just
* parsed a valid CBM that should be
@@ -261,6 +264,7 @@ int update_domains(struct rdt_resource *r, int closid)
struct resctrl_staged_config *cfg;
struct rdt_hw_domain *hw_dom;
struct msr_param msr_param;
+ enum resctrl_conf_type t;
cpumask_var_t cpu_mask;
struct rdt_domain *d;
bool mba_sc;
@@ -276,9 +280,13 @@ int update_domains(struct rdt_resource *r, int closid)
mba_sc = is_mba_sc(r);
list_for_each_entry(d, &r->domains, list) {
hw_dom = resctrl_to_arch_dom(d);
- cfg = &hw_dom->resctrl.staged_config;
- if (cfg->have_new_ctrl)
+ for (t = 0; t < CDP_NUM_TYPES; t++) {
+ cfg = &hw_dom->resctrl.staged_config[t];
+ if (!cfg->have_new_ctrl)
+ continue;
+
apply_config(hw_dom, cfg, closid, cpu_mask, mba_sc);
+ }
}

/*
@@ -350,7 +358,7 @@ ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,

list_for_each_entry(s, &resctrl_schema_all, list) {
list_for_each_entry(dom, &s->res->domains, list)
- memset(&dom->staged_config, 0, sizeof(dom->staged_config));
+ memset(dom->staged_config, 0, sizeof(dom->staged_config));
}

while ((tok = strsep(&buf, "\n")) != NULL) {
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 0867319cf5ec..f89cdb107297 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -2728,6 +2728,7 @@ static u32 cbm_ensure_valid(u32 _val, struct rdt_resource *r)
static int __init_one_rdt_domain(struct rdt_domain *d, struct resctrl_schema *s,
u32 closid)
{
+ enum resctrl_conf_type t = s->conf_type;
struct rdt_resource *r_cdp = NULL;
struct resctrl_staged_config *cfg;
struct rdt_domain *d_cdp = NULL;
@@ -2739,7 +2740,7 @@ static int __init_one_rdt_domain(struct rdt_domain *d, struct resctrl_schema *s,
int i;

rdt_cdp_peer_get(r, d, &r_cdp, &d_cdp);
- cfg = &d->staged_config;
+ cfg = &d->staged_config[t];
cfg->have_new_ctrl = false;
cfg->new_ctrl = r->cache.shareable_bits;
used_b = r->cache.shareable_bits;
@@ -2823,7 +2824,7 @@ static void rdtgroup_init_mba(struct rdt_resource *r)
struct rdt_domain *d;

list_for_each_entry(d, &r->domains, list) {
- cfg = &d->staged_config;
+ cfg = &d->staged_config[CDP_BOTH];
cfg->new_ctrl = is_mba_sc(r) ? MBA_MAX_MBPS : r->default_ctrl;
cfg->have_new_ctrl = true;
}
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 2d0f1f6e0998..06654f9346a2 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -21,6 +21,9 @@ enum resctrl_conf_type {
CDP_DATA,
};

+#define CDP_NUM_TYPES (CDP_DATA + 1)
+
+
/**
* struct resctrl_staged_config - parsed configuration to be applied
* @new_ctrl: new ctrl value to be loaded
@@ -58,7 +61,7 @@ struct rdt_domain {
int mbm_work_cpu;
int cqm_work_cpu;
struct pseudo_lock_region *plr;
- struct resctrl_staged_config staged_config;
+ struct resctrl_staged_config staged_config[CDP_NUM_TYPES];
};

/**
--
2.30.0