Thread (120 messages) 120 messages, 6 authors, 2026-01-13

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

From: Zeng Heng <hidden>
Date: 2026-01-09 03:45:29
Also in: kvmarm, lkml

quoted hunk ↗ jump to hunk
From: James Morse <james.morse@arm.com>
Date: Fri, 5 Dec 2025 21:58:32 +0000
Subject: [PATCH v2 18/45] arm_mpam: resctrl: Implement resctrl_arch_reset_all_ctrls()

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_resctrl.c b/drivers/resctrl/mpam_resctrl.c
index bc4f1c80eab..d32e8700245 100644
--- a/drivers/resctrl/mpam_resctrl.c
+++ b/drivers/resctrl/mpam_resctrl.c
@@ -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)
mpam_cpu_offline() already directly calls mpam_reset_ris() to reset the
MPAM MSC that is about to go offline. So why here still need
mpam_resctrl_offline_cpu() to invoke mpam_reset_component_locked(),
which ends up calling mpam_reset_ris() again?

Please point it out if I might have overlooked anything, thank you.


Best Regards,
Zeng Heng
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