[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20250521225049.132551-24-tony.luck@intel.com>
Date: Wed, 21 May 2025 15:50:41 -0700
From: Tony Luck <tony.luck@...el.com>
To: Fenghua Yu <fenghuay@...dia.com>,
Reinette Chatre <reinette.chatre@...el.com>,
Maciej Wieczor-Retman <maciej.wieczor-retman@...el.com>,
Peter Newman <peternewman@...gle.com>,
James Morse <james.morse@....com>,
Babu Moger <babu.moger@....com>,
Drew Fustini <dfustini@...libre.com>,
Dave Martin <Dave.Martin@....com>,
Anil Keshavamurthy <anil.s.keshavamurthy@...el.com>,
Chen Yu <yu.c.chen@...el.com>
Cc: x86@...nel.org,
linux-kernel@...r.kernel.org,
patches@...ts.linux.dev,
Tony Luck <tony.luck@...el.com>
Subject: [PATCH v5 23/29] x86/resctrl: Enable RDT_RESOURCE_PERF_PKG
The RDT_RESOURCE_PERF_PKG resource is not marked as "mon_capable" during
early resctrl initialization. This means that the domain lists for the
resource are not built when the CPU hot plug notifiers are registered.
Mark the resource as mon_capable and call domain_add_cpu_mon() for
each online CPU to build the domain lists in the first call to the
resctrl_arch_pre_mount() hook.
Signed-off-by: Tony Luck <tony.luck@...el.com>
---
arch/x86/kernel/cpu/resctrl/core.c | 15 ++++++++++++++-
1 file changed, 14 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 18d84c497ee4..f07f5b58639a 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -763,14 +763,27 @@ static int resctrl_arch_offline_cpu(unsigned int cpu)
void resctrl_arch_pre_mount(void)
{
+ struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_PERF_PKG].r_resctrl;
static atomic_t only_once;
- int old = 0;
+ int cpu, old = 0;
if (!atomic_try_cmpxchg(&only_once, &old, 1))
return;
if (!intel_aet_get_events())
return;
+
+ /*
+ * Late discovery of telemetry events means the domains for the
+ * resource were not built. Do that now.
+ */
+ cpus_read_lock();
+ mutex_lock(&domain_list_lock);
+ r->mon_capable = true;
+ for_each_online_cpu(cpu)
+ domain_add_cpu_mon(cpu, r);
+ mutex_unlock(&domain_list_lock);
+ cpus_read_unlock();
}
enum {
--
2.49.0
Powered by blists - more mailing lists