[PATCH v1 14/31] x86/resctrl: Export the is_mbm_*_enabled() helpers to asm/resctrl.h

James Morse
2024-03-21T16:52:15Z

The architecture specific parts of resctrl have helpers to hide accesses
to the rdt_mon_features bitmap.

Once the filesystem parts of resctrl are moved, these can no longer live
in internal.h. Once these are exposed to the wider kernel, they should
have a 'resctrl_arch_' prefix, to fit the rest of the arch<->fs interface.

Move and rename the helpers that touch rdt_mon_features directly.
is_mbm_event() and is_mbm_enabled() are only called from rdtgroup.c,
so can be moved into that file.

Signed-off-by: James Morse <james.morse@arm.com>
---
arch/x86/include/asm/resctrl.h | 17 +++++++++++
arch/x86/kernel/cpu/resctrl/core.c | 4 +--
arch/x86/kernel/cpu/resctrl/internal.h | 27 -----------------
arch/x86/kernel/cpu/resctrl/monitor.c | 18 ++++++------
arch/x86/kernel/cpu/resctrl/rdtgroup.c | 40 +++++++++++++++++---------
5 files changed, 54 insertions(+), 52 deletions(-)

diff --git a/arch/x86/include/asm/resctrl.h b/arch/x86/include/asm/resctrl.h
index 5f6a5375bb4a..50407e83d0ca 100644
--- a/arch/x86/include/asm/resctrl.h
+++ b/arch/x86/include/asm/resctrl.h
@@ -7,6 +7,7 @@
#include <linux/jump_label.h>
#include <linux/percpu.h>
#include <linux/sched.h>
+#include <linux/resctrl_types.h>

/*
* This value can never be a valid CLOSID, and is used when mapping a
@@ -43,6 +44,7 @@ DECLARE_PER_CPU(struct resctrl_pqr_state, pqr_state);

extern bool rdt_alloc_capable;
extern bool rdt_mon_capable;
+extern unsigned int rdt_mon_features;

DECLARE_STATIC_KEY_FALSE(rdt_enable_key);
DECLARE_STATIC_KEY_FALSE(rdt_alloc_enable_key);
@@ -82,6 +84,21 @@ static inline void resctrl_arch_disable_mon(void)
static_branch_dec_cpuslocked(&rdt_enable_key);
}

+static inline bool resctrl_arch_is_llc_occupancy_enabled(void)
+{
+ return (rdt_mon_features & (1 << QOS_L3_OCCUP_EVENT_ID));
+}
+
+static inline bool resctrl_arch_is_mbm_total_enabled(void)
+{
+ return (rdt_mon_features & (1 << QOS_L3_MBM_TOTAL_EVENT_ID));
+}
+
+static inline bool resctrl_arch_is_mbm_local_enabled(void)
+{
+ return (rdt_mon_features & (1 << QOS_L3_MBM_LOCAL_EVENT_ID));
+}
+
/*
* __resctrl_sched_in() - Writes the task's CLOSid/RMID to IA32_PQR_MSR
*
diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 9551ca4a6480..a4b5ade6e291 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -481,13 +481,13 @@ static int arch_domain_mbm_alloc(u32 num_rmid, struct rdt_hw_domain *hw_dom)
{
size_t tsize;

- if (is_mbm_total_enabled()) {
+ if (resctrl_arch_is_mbm_total_enabled()) {
tsize = sizeof(*hw_dom->arch_mbm_total);
hw_dom->arch_mbm_total = kcalloc(num_rmid, tsize, GFP_KERNEL);
if (!hw_dom->arch_mbm_total)
return -ENOMEM;
}
- if (is_mbm_local_enabled()) {
+ if (resctrl_arch_is_mbm_local_enabled()) {
tsize = sizeof(*hw_dom->arch_mbm_local);
hw_dom->arch_mbm_local = kcalloc(num_rmid, tsize, GFP_KERNEL);
if (!hw_dom->arch_mbm_local) {
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 01fcd4ef26ca..edbccc79246f 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -130,7 +130,6 @@ struct rmid_read {
void *arch_mon_ctx;
};

-extern unsigned int rdt_mon_features;
extern struct list_head resctrl_schema_all;
extern bool resctrl_mounted;

@@ -360,32 +359,6 @@ struct msr_param {
u32 high;
};

-static inline bool is_llc_occupancy_enabled(void)
-{
- return (rdt_mon_features & (1 << QOS_L3_OCCUP_EVENT_ID));
-}
-
-static inline bool is_mbm_total_enabled(void)
-{
- return (rdt_mon_features & (1 << QOS_L3_MBM_TOTAL_EVENT_ID));
-}
-
-static inline bool is_mbm_local_enabled(void)
-{
- return (rdt_mon_features & (1 << QOS_L3_MBM_LOCAL_EVENT_ID));
-}
-
-static inline bool is_mbm_enabled(void)
-{
- return (is_mbm_total_enabled() || is_mbm_local_enabled());
-}
-
-static inline bool is_mbm_event(int e)
-{
- return (e >= QOS_L3_MBM_TOTAL_EVENT_ID &&
- e <= QOS_L3_MBM_LOCAL_EVENT_ID);
-}
-
/**
* struct rdt_hw_resource - arch private attributes of a resctrl resource
* @r_resctrl: Attributes of the resource used directly by resctrl.
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index 2a1cbd4de6ee..c9be2d0819c0 100644
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -251,11 +251,11 @@ void resctrl_arch_reset_rmid_all(struct rdt_resource *r, struct rdt_domain *d)
{
struct rdt_hw_domain *hw_dom = resctrl_to_arch_dom(d);

- if (is_mbm_total_enabled())
+ if (resctrl_arch_is_mbm_total_enabled())
memset(hw_dom->arch_mbm_total, 0,
sizeof(*hw_dom->arch_mbm_total) * r->num_rmid);

- if (is_mbm_local_enabled())
+ if (resctrl_arch_is_mbm_local_enabled())
memset(hw_dom->arch_mbm_local, 0,
sizeof(*hw_dom->arch_mbm_local) * r->num_rmid);
}
@@ -514,7 +514,7 @@ void free_rmid(u32 closid, u32 rmid)

entry = __rmid_entry(idx);

- if (is_llc_occupancy_enabled())
+ if (resctrl_arch_is_llc_occupancy_enabled())
add_rmid_to_limbo(entry);
else
list_add_tail(&entry->list, &rmid_free_lru);
@@ -666,7 +666,7 @@ static void update_mba_bw(struct rdtgroup *rgrp, struct rdt_domain *dom_mbm)
struct list_head *head;
struct rdtgroup *entry;

- if (!is_mbm_local_enabled())
+ if (!resctrl_arch_is_mbm_local_enabled())
return;

r_mba = resctrl_arch_get_resource(RDT_RESOURCE_MBA);
@@ -735,7 +735,7 @@ static void mbm_update(struct rdt_resource *r, struct rdt_domain *d,
* This is protected from concurrent reads from user
* as both the user and we hold the global mutex.
*/
- if (is_mbm_total_enabled()) {
+ if (resctrl_arch_is_mbm_total_enabled()) {
rr.evtid = QOS_L3_MBM_TOTAL_EVENT_ID;
rr.val = 0;
rr.arch_mon_ctx = resctrl_arch_mon_ctx_alloc(rr.r, rr.evtid);
@@ -749,7 +749,7 @@ static void mbm_update(struct rdt_resource *r, struct rdt_domain *d,

resctrl_arch_mon_ctx_free(rr.r, rr.evtid, rr.arch_mon_ctx);
}
- if (is_mbm_local_enabled()) {
+ if (resctrl_arch_is_mbm_local_enabled()) {
rr.evtid = QOS_L3_MBM_LOCAL_EVENT_ID;
rr.val = 0;
rr.arch_mon_ctx = resctrl_arch_mon_ctx_alloc(rr.r, rr.evtid);
@@ -997,11 +997,11 @@ static void l3_mon_evt_init(struct rdt_resource *r)
{
INIT_LIST_HEAD(&r->evt_list);

- if (is_llc_occupancy_enabled())
+ if (resctrl_arch_is_llc_occupancy_enabled())
list_add_tail(&llc_occupancy_event.list, &r->evt_list);
- if (is_mbm_total_enabled())
+ if (resctrl_arch_is_mbm_total_enabled())
list_add_tail(&mbm_total_event.list, &r->evt_list);
- if (is_mbm_local_enabled())
+ if (resctrl_arch_is_mbm_local_enabled())
list_add_tail(&mbm_local_event.list, &r->evt_list);
}

diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 3f16e7854411..8285b916289c 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -114,6 +114,18 @@ void rdt_staged_configs_clear(void)
}
}

+static bool resctrl_is_mbm_enabled(void)
+{
+ return (resctrl_arch_is_mbm_total_enabled() ||
+ resctrl_arch_is_mbm_local_enabled());
+}
+
+static bool resctrl_is_mbm_event(int e)
+{
+ return (e >= QOS_L3_MBM_TOTAL_EVENT_ID &&
+ e <= QOS_L3_MBM_LOCAL_EVENT_ID);
+}
+
/*
* Trivial allocator for CLOSIDs. Since h/w only supports a small number,
* we can keep a bitmap of free CLOSIDs in a single integer.
@@ -161,7 +173,7 @@ static int closid_alloc(void)
lockdep_assert_held(&rdtgroup_mutex);

if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID) &&
- is_llc_occupancy_enabled()) {
+ resctrl_arch_is_llc_occupancy_enabled()) {
cleanest_closid = resctrl_find_cleanest_closid();
if (cleanest_closid < 0)
return cleanest_closid;
@@ -2370,7 +2382,7 @@ static bool supports_mba_mbps(void)
{
struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_MBA);

- return (is_mbm_local_enabled() &&
+ return (resctrl_arch_is_mbm_local_enabled() &&
r->alloc_capable && is_mba_linear());
}

@@ -2738,7 +2750,7 @@ static int rdt_get_tree(struct fs_context *fc)
if (resctrl_arch_alloc_capable() || resctrl_arch_mon_capable())
resctrl_mounted = true;

- if (is_mbm_enabled()) {
+ if (resctrl_is_mbm_enabled()) {
list_for_each_entry(dom, &l3->domains, list)
mbm_setup_overflow_handler(dom, MBM_OVERFLOW_INTERVAL,
RESCTRL_PICK_ANY_CPU);
@@ -3107,7 +3119,7 @@ static int mkdir_mondata_subdir(struct kernfs_node *parent_kn,
if (ret)
goto out_destroy;

- if (is_mbm_event(mevt->evtid))
+ if (resctrl_is_mbm_event(mevt->evtid))
mon_event_read(&rr, r, d, prgrp, mevt->evtid, true);
}
kernfs_activate(kn);
@@ -4006,9 +4018,9 @@ void resctrl_offline_domain(struct rdt_resource *r, struct rdt_domain *d)
if (resctrl_mounted && resctrl_arch_mon_capable())
rmdir_mondata_subdir_allrdtgrp(r, d->id);

- if (is_mbm_enabled())
+ if (resctrl_is_mbm_enabled())
cancel_delayed_work(&d->mbm_over);
- if (is_llc_occupancy_enabled() && has_busy_rmid(d)) {
+ if (resctrl_arch_is_llc_occupancy_enabled() && has_busy_rmid(d)) {
/*
* When a package is going down, forcefully
* decrement rmid->ebusy. There is no way to know
@@ -4032,12 +4044,12 @@ static int domain_setup_mon_state(struct rdt_resource *r, struct rdt_domain *d)
u32 idx_limit = resctrl_arch_system_num_rmid_idx();
size_t tsize;

- if (is_llc_occupancy_enabled()) {
+ if (resctrl_arch_is_llc_occupancy_enabled()) {
d->rmid_busy_llc = bitmap_zalloc(idx_limit, GFP_KERNEL);
if (!d->rmid_busy_llc)
return -ENOMEM;
}
- if (is_mbm_total_enabled()) {
+ if (resctrl_arch_is_mbm_total_enabled()) {
tsize = sizeof(*d->mbm_total);
d->mbm_total = kcalloc(idx_limit, tsize, GFP_KERNEL);
if (!d->mbm_total) {
@@ -4045,7 +4057,7 @@ static int domain_setup_mon_state(struct rdt_resource *r, struct rdt_domain *d)
return -ENOMEM;
}
}
- if (is_mbm_local_enabled()) {
+ if (resctrl_arch_is_mbm_local_enabled()) {
tsize = sizeof(*d->mbm_local);
d->mbm_local = kcalloc(idx_limit, tsize, GFP_KERNEL);
if (!d->mbm_local) {
@@ -4077,13 +4089,13 @@ int resctrl_online_domain(struct rdt_resource *r, struct rdt_domain *d)
if (err)
goto out_unlock;

- if (is_mbm_enabled()) {
+ if (resctrl_is_mbm_enabled()) {
INIT_DELAYED_WORK(&d->mbm_over, mbm_handle_overflow);
mbm_setup_overflow_handler(d, MBM_OVERFLOW_INTERVAL,
RESCTRL_PICK_ANY_CPU);
}

- if (is_llc_occupancy_enabled())
+ if (resctrl_arch_is_llc_occupancy_enabled())
INIT_DELAYED_WORK(&d->cqm_limbo, cqm_handle_limbo);

/*
@@ -4138,12 +4150,12 @@ void resctrl_offline_cpu(unsigned int cpu)

d = get_domain_from_cpu(cpu, l3);
if (d) {
- if (is_mbm_enabled() && cpu == d->mbm_work_cpu) {
+ if (resctrl_is_mbm_enabled() && cpu == d->mbm_work_cpu) {
cancel_delayed_work(&d->mbm_over);
mbm_setup_overflow_handler(d, 0, cpu);
}
- if (is_llc_occupancy_enabled() && cpu == d->cqm_work_cpu &&
- has_busy_rmid(d)) {
+ if (resctrl_arch_is_llc_occupancy_enabled() &&
+ cpu == d->cqm_work_cpu && has_busy_rmid(d)) {
cancel_delayed_work(&d->cqm_limbo);
cqm_setup_limbo_handler(d, 0, cpu);
}
--
2.39.2