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arm_mpam: propagate MSC access errors in mpam_reset_class_locked()

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The mpam_reset_ris() function can return an error, propagate this up
through mpam_reset_component_locked() to mpam_reset_class_locked(),
which is exported. The external caller is a void function, so cannot
really handle the error at the moment, but at least we report everything
on the MPAM interface side.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@oss.qualcomm.com>
Reviewed-by: Ben Horgan <ben.horgan@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>
This commit is contained in:
Andre Przywara 2026-10-01 17:34:34 +02:00 committed by James Morse
parent 49a5f825e9
commit cea32229ec
2 changed files with 19 additions and 7 deletions
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24
drivers/resctrl/mpam_devices.c
View File

@ -3040,7 +3040,7 @@ static void mpam_enable_once(void)
mpam_partid_max + 1, mpam_pmg_max + 1);
}
static void mpam_reset_component_locked(struct mpam_component *comp)
static int mpam_reset_component_locked(struct mpam_component *comp)
{
struct mpam_vmsc *vmsc;
@ -3054,26 +3054,38 @@ static void mpam_reset_component_locked(struct mpam_component *comp)
srcu_read_lock_held(&mpam_srcu)) {
struct mpam_msc *msc = vmsc->msc;
struct mpam_msc_ris *ris;
int ret;
list_for_each_entry_srcu(ris, &vmsc->ris, vmsc_list,
srcu_read_lock_held(&mpam_srcu)) {
if (!ris->in_reset_state)
mpam_touch_msc(msc, mpam_reset_ris, ris);
if (!ris->in_reset_state) {
ret = mpam_touch_msc(msc, mpam_reset_ris, ris);
if (ret)
return ret;
}
ris->in_reset_state = true;
}
}
return 0;
}
void mpam_reset_class_locked(struct mpam_class *class)
int mpam_reset_class_locked(struct mpam_class *class)
{
struct mpam_component *comp;
int ret;
lockdep_assert_cpus_held();
guard(srcu)(&mpam_srcu);
list_for_each_entry_srcu(comp, &class->components, class_list,
srcu_read_lock_held(&mpam_srcu))
mpam_reset_component_locked(comp);
srcu_read_lock_held(&mpam_srcu)) {
ret = mpam_reset_component_locked(comp);
if (ret)
return ret;
}
return 0;
}
static void mpam_reset_class(struct mpam_class *class)

2
drivers/resctrl/mpam_internal.h
View File

@ -465,7 +465,7 @@ void mpam_enable(struct work_struct *work);
void mpam_disable(struct work_struct *work);
/* Reset all the RIS in a class under cpus_read_lock() */
void mpam_reset_class_locked(struct mpam_class *class);
int mpam_reset_class_locked(struct mpam_class *class);
int mpam_apply_config(struct mpam_component *comp, u16 partid,
struct mpam_config *cfg);