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Date: Thu, 20 Apr 2023 15:06:36 -0700
From: Tony Luck <tony.luck@...el.com>
To: Fenghua Yu <fenghua.yu@...el.com>,
Reinette Chatre <reinette.chatre@...el.com>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
Dave Hansen <dave.hansen@...ux.intel.com>,
"H. Peter Anvin" <hpa@...or.com>,
Shaopeng Tan <tan.shaopeng@...itsu.com>,
Jamie Iles <quic_jiles@...cinc.com>,
James Morse <james.morse@....com>,
Babu Moger <babu.moger@....com>
Cc: x86@...nel.org, linux-kernel@...r.kernel.org,
Tony Luck <tony.luck@...el.com>
Subject: [RFC PATCH 7/7] x86/resctrl: Example resctrl driver
Simply add two files to each ctrlmon directory that show the closid and
rmid respectively.
Signed-off-by: Tony Luck <tony.luck@...el.com>
---
.../cpu/resctrl/drivers/resctrl_example.c | 77 +++++++++++++++++++
arch/x86/Kconfig | 11 +++
arch/x86/kernel/cpu/resctrl/Makefile | 1 +
arch/x86/kernel/cpu/resctrl/drivers/Makefile | 1 +
4 files changed, 90 insertions(+)
create mode 100644 arch/x86/kernel/cpu/resctrl/drivers/resctrl_example.c
create mode 100644 arch/x86/kernel/cpu/resctrl/drivers/Makefile
diff --git a/arch/x86/kernel/cpu/resctrl/drivers/resctrl_example.c b/arch/x86/kernel/cpu/resctrl/drivers/resctrl_example.c
new file mode 100644
index 000000000000..24998e0dc3c2
--- /dev/null
+++ b/arch/x86/kernel/cpu/resctrl/drivers/resctrl_example.c
@@ -0,0 +1,77 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright(c) 2023 Intel Corporation. */
+
+/*
+ * Example resctrl driver
+ */
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/acpi.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include <linux/resctrl.h>
+
+#undef pr_fmt
+#define pr_fmt(fmt) "exampleresctrl: " fmt
+
+static int closid_show(struct seq_file *sf, void *arg)
+{
+ struct kernfs_open_file *of = sf->private;
+ unsigned long priv = (unsigned long)of->kn->priv;
+ u32 closid = priv >> 16;
+
+ seq_printf(sf, "%d\n", closid);
+
+ return 0;
+}
+
+static int rmid_show(struct seq_file *sf, void *arg)
+{
+ struct kernfs_open_file *of = sf->private;
+ unsigned long priv = (unsigned long)of->kn->priv;
+ u32 rmid = priv & 0xffff;
+
+ seq_printf(sf, "%d\n", rmid);
+
+ return 0;
+}
+
+static struct kernfs_ops closid_ops = {
+ .seq_show = closid_show,
+};
+
+static struct kernfs_ops rmid_ops = {
+ .seq_show = rmid_show,
+};
+
+static struct resctrl_fileinfo files[] = {
+ {
+ .name = "closid", .ops = &closid_ops
+ },
+ {
+ .name = "rmid", .ops = &rmid_ops
+ },
+ {
+ }
+};
+
+static struct resctrl_driver ops = {
+ .ctrlfiles = files,
+};
+
+static int __init init_example(void)
+{
+ resctrl_register_driver(&ops);
+
+ return 0;
+}
+
+static void __exit cleanup_example(void)
+{
+ resctrl_unregister_driver(&ops);
+}
+
+module_init(init_example);
+module_exit(cleanup_example);
+
+MODULE_LICENSE("GPL");
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index a825bf031f49..7f2faec17365 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -500,6 +500,17 @@ config X86_CPU_RESCTRL
Say N if unsure.
+config X86_CPU_RESCTRL_DRIVERS
+ bool "resctrl driver"
+
+config X86_CPU_RESCTRL_EXAMPLE_DRIVER
+ tristate "example x86 resctrl driver"
+ depends on X86_CPU_RESCTRL
+ select X86_CPU_RESCTRL_DRIVERS
+ help
+ Example driver to show one possible use case for
+ resctrl driver registration.
+
if X86_32
config X86_BIGSMP
bool "Support for big SMP systems with more than 8 CPUs"
diff --git a/arch/x86/kernel/cpu/resctrl/Makefile b/arch/x86/kernel/cpu/resctrl/Makefile
index 4a06c37b9cf1..7db4d729afbc 100644
--- a/arch/x86/kernel/cpu/resctrl/Makefile
+++ b/arch/x86/kernel/cpu/resctrl/Makefile
@@ -1,4 +1,5 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_X86_CPU_RESCTRL) += core.o rdtgroup.o monitor.o
obj-$(CONFIG_X86_CPU_RESCTRL) += ctrlmondata.o pseudo_lock.o
+obj-$(CONFIG_X86_CPU_RESCTRL_DRIVERS) += drivers/
CFLAGS_pseudo_lock.o = -I$(src)
diff --git a/arch/x86/kernel/cpu/resctrl/drivers/Makefile b/arch/x86/kernel/cpu/resctrl/drivers/Makefile
new file mode 100644
index 000000000000..27db936eb947
--- /dev/null
+++ b/arch/x86/kernel/cpu/resctrl/drivers/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_X86_CPU_RESCTRL_EXAMPLE_DRIVER) += resctrl_example.o
--
2.39.2
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