linux-kernel - [PATCH v4 05/31] fs/resctrl: Set up Kconfig options for telemetry events

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Message-ID: <20250429003359.375508-6-tony.luck@intel.com>
Date: Mon, 28 Apr 2025 17:33:31 -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 v4 05/31] fs/resctrl: Set up Kconfig options for telemetry events

Intel RMID based telemetry events are counted by each CPU core
and then aggregated by one or more per-socket micro controllers.
Enumeration support is provided by the Intel PMT subsystem.

N.B. Patches for the Intel PMT system are still in progress.
They will define an INTEL_PMT_DISCOVERY Kconfig symbol that
will be one of the dependencies. This is commented out for
now. Final version will include this dependency.

arch/x86 selects this option based on:

X86_64: Counter registers are in MMIO space. There is no readq()
function on 32-bit. Emulation is possible with readl(), but there
are races. Running 32-bit kernels on systems that support this
feature seems pointless.

CPU_SUP_INTEL: It is an Intel specific feature.

Signed-off-by: Tony Luck <tony.luck@...el.com>
---
 arch/x86/Kconfig                       | 1 +
 drivers/platform/x86/intel/pmt/Kconfig | 7 +++++++
 2 files changed, 8 insertions(+)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 5a09acf41c8e..19107fdb4264 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -508,6 +508,7 @@ config X86_CPU_RESCTRL
 	bool "x86 CPU resource control support"
 	depends on X86 && (CPU_SUP_INTEL || CPU_SUP_AMD)
 	depends on MISC_FILESYSTEMS
+	select INTEL_AET_RESCTRL if (X86_64 && CPU_SUP_INTEL)
 	select ARCH_HAS_CPU_RESCTRL
 	select RESCTRL_FS
 	select RESCTRL_FS_PSEUDO_LOCK
diff --git a/drivers/platform/x86/intel/pmt/Kconfig b/drivers/platform/x86/intel/pmt/Kconfig
index e916fc966221..3a8ce39d1004 100644
--- a/drivers/platform/x86/intel/pmt/Kconfig
+++ b/drivers/platform/x86/intel/pmt/Kconfig
@@ -38,3 +38,10 @@ config INTEL_PMT_CRASHLOG
 
 	  To compile this driver as a module, choose M here: the module
 	  will be called intel_pmt_crashlog.
+
+config INTEL_AET_RESCTRL
+	depends on INTEL_PMT_TELEMETRY # && INTEL_PMT_DISCOVERY
+	bool
+	help
+	  Architecture config should "select" this option to enable
+	  support for RMID telemetry events in the resctrl file system.
-- 
2.48.1