[PATCH v2 18/45] arm_mpam: resctrl: Implement resctrl_arch_reset_all_ctrls()

Ben Horgan
2025-12-19T18:13:29Z

From: James Morse <james.morse@arm.com>

We already have a helper for resetting an mpam class and component. Hook
it up to resctrl_arch_reset_all_ctrls() and the domain offline path.

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Ben Horgan <ben.horgan@arm.com>
---
drivers/resctrl/mpam_devices.c | 6 +++---
drivers/resctrl/mpam_internal.h | 7 +++++++
drivers/resctrl/mpam_resctrl.c | 15 +++++++++++++++
3 files changed, 25 insertions(+), 3 deletions(-)

diff --git a/drivers/resctrl/mpam_devices.c b/drivers/resctrl/mpam_devices.c
index 303aacfcb9d6..4f5d908d02a9 100644
--- a/drivers/resctrl/mpam_devices.c
+++ b/drivers/resctrl/mpam_devices.c
@@ -2544,7 +2544,7 @@ static void mpam_enable_once(void)
mpam_partid_max + 1, mpam_pmg_max + 1);
}

-static void mpam_reset_component_locked(struct mpam_component *comp)
+void mpam_reset_component_locked(struct mpam_component *comp)
{
struct mpam_vmsc *vmsc;

@@ -2568,7 +2568,7 @@ static void mpam_reset_component_locked(struct mpam_component *comp)
}
}

-static void mpam_reset_class_locked(struct mpam_class *class)
+void mpam_reset_class_locked(struct mpam_class *class)
{
struct mpam_component *comp;

@@ -2580,7 +2580,7 @@ static void mpam_reset_class_locked(struct mpam_class *class)
mpam_reset_component_locked(comp);
}

-static void mpam_reset_class(struct mpam_class *class)
+void mpam_reset_class(struct mpam_class *class)
{
cpus_read_lock();
mpam_reset_class_locked(class);
diff --git a/drivers/resctrl/mpam_internal.h b/drivers/resctrl/mpam_internal.h
index 554e4887ba81..b9a739abb101 100644
--- a/drivers/resctrl/mpam_internal.h
+++ b/drivers/resctrl/mpam_internal.h
@@ -389,6 +389,13 @@ extern u8 mpam_pmg_max;
void mpam_enable(struct work_struct *work);
void mpam_disable(struct work_struct *work);

+/* Reset all the RIS in a class, optionally while holding cpus_read_lock() */
+void mpam_reset_class_locked(struct mpam_class *class);
+void mpam_reset_class(struct mpam_class *class);
+
+/* Reset all the RIS in a component under cpus_read_lock() */
+void mpam_reset_component_locked(struct mpam_component *comp);
+
int mpam_apply_config(struct mpam_component *comp, u16 partid,
struct mpam_config *cfg);

diff --git a/drivers/resctrl/mpam_resctrl.c b/drivers/resctrl/mpam_resctrl.c
index bc4f1c80eab5..d32e87002457 100644
--- a/drivers/resctrl/mpam_resctrl.c
+++ b/drivers/resctrl/mpam_resctrl.c
@@ -167,6 +167,19 @@ static int mpam_resctrl_pick_domain_id(int cpu, struct mpam_component *comp)
return comp->comp_id;
}

+void resctrl_arch_reset_all_ctrls(struct rdt_resource *r)
+{
+ struct mpam_resctrl_res *res;
+
+ lockdep_assert_cpus_held();
+
+ if (!mpam_is_enabled())
+ return;
+
+ res = container_of(r, struct mpam_resctrl_res, resctrl_res);
+ mpam_reset_class_locked(res->class);
+}
+
static void mpam_resctrl_domain_hdr_init(int cpu, struct mpam_component *comp,
struct rdt_domain_hdr *hdr)
{
@@ -353,6 +366,8 @@ void mpam_resctrl_offline_cpu(unsigned int cpu)

ctrl_dom_empty = true;
if (exposed_alloc_capable) {
+ mpam_reset_component_locked(dom->ctrl_comp);
+
ctrl_d = &dom->resctrl_ctrl_dom;
ctrl_dom_empty = mpam_resctrl_offline_domain_hdr(cpu, &ctrl_d->hdr);
if (ctrl_dom_empty)
--
2.43.0