linux-kernel - [PATCH v3 04/26] fs/resctrl: Set up Kconfig options for telemetry events

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250407234032.241215-5-tony.luck@intel.com>
Date: Mon,  7 Apr 2025 16:40:06 -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>
Cc: linux-kernel@...r.kernel.org,
	patches@...ts.linux.dev,
	Tony Luck <tony.luck@...el.com>
Subject: [PATCH v3 04/26] fs/resctrl: Set up Kconfig options for telemetry events

Enumeration support is provided by the Intel PMT subsystem.

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 | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index ea29d22a621f..44a195ee7a42 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -504,6 +504,7 @@ 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..b282910b49ef 100644
--- a/drivers/platform/x86/intel/pmt/Kconfig
+++ b/drivers/platform/x86/intel/pmt/Kconfig
@@ -38,3 +38,9 @@ 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
+	bool
+	help
+	  Architecture config should "select" this option to enable
+	  support for RMID telemtry events in the resctrl file system.
-- 
2.48.1