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perf/amd/uncore: Allow the driver to be built as a module

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Add support to build the AMD uncore driver as a module.

This is in order to facilitate development without having
to reboot the kernel in most cases.

Signed-off-by: Kim Phillips <kim.phillips@amd.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20210817221048.88063-8-kim.phillips@amd.com
This commit is contained in:
Kim Phillips 2021-08-17 17:10:47 -05:00 committed by Ingo Molnar
parent 9164d9493a
commit 05485745ad
3 changed files with 40 additions and 3 deletions
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10
arch/x86/events/Kconfig
View File

@ -34,4 +34,14 @@ config PERF_EVENTS_AMD_POWER
(CPUID Fn8000_0007_EDX[12]) interface to calculate the
average power consumption on Family 15h processors.
config PERF_EVENTS_AMD_UNCORE
tristate "AMD Uncore performance events"
depends on PERF_EVENTS && CPU_SUP_AMD
default y
help
Include support for AMD uncore performance events for use with
e.g., perf stat -e amd_l3/.../,amd_df/.../.
To compile this driver as a module, choose M here: the
module will be called 'amd-uncore'.
endmenu

5
arch/x86/events/amd/Makefile
View File

@ -1,8 +1,9 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_CPU_SUP_AMD) += core.o uncore.o
obj-$(CONFIG_CPU_SUP_AMD) += core.o
obj-$(CONFIG_PERF_EVENTS_AMD_POWER) += power.o
obj-$(CONFIG_X86_LOCAL_APIC) += ibs.o
obj-$(CONFIG_PERF_EVENTS_AMD_UNCORE) += amd-uncore.o
amd-uncore-objs := uncore.o
ifdef CONFIG_AMD_IOMMU
obj-$(CONFIG_CPU_SUP_AMD) += iommu.o
endif

28
arch/x86/events/amd/uncore.c
View File

@ -347,6 +347,7 @@ static struct pmu amd_nb_pmu = {
.stop = amd_uncore_stop,
.read = amd_uncore_read,
.capabilities = PERF_PMU_CAP_NO_EXCLUDE | PERF_PMU_CAP_NO_INTERRUPT,
.module = THIS_MODULE,
};
static struct pmu amd_llc_pmu = {
@ -360,6 +361,7 @@ static struct pmu amd_llc_pmu = {
.stop = amd_uncore_stop,
.read = amd_uncore_read,
.capabilities = PERF_PMU_CAP_NO_EXCLUDE | PERF_PMU_CAP_NO_INTERRUPT,
.module = THIS_MODULE,
};
static struct amd_uncore *amd_uncore_alloc(unsigned int cpu)
@ -665,4 +667,28 @@ fail_nb:
return ret;
}
device_initcall(amd_uncore_init);
static void __exit amd_uncore_exit(void)
{
cpuhp_remove_state(CPUHP_AP_PERF_X86_AMD_UNCORE_ONLINE);
cpuhp_remove_state(CPUHP_AP_PERF_X86_AMD_UNCORE_STARTING);
cpuhp_remove_state(CPUHP_PERF_X86_AMD_UNCORE_PREP);
if (boot_cpu_has(X86_FEATURE_PERFCTR_LLC)) {
perf_pmu_unregister(&amd_llc_pmu);
free_percpu(amd_uncore_llc);
amd_uncore_llc = NULL;
}
if (boot_cpu_has(X86_FEATURE_PERFCTR_NB)) {
perf_pmu_unregister(&amd_nb_pmu);
free_percpu(amd_uncore_nb);
amd_uncore_nb = NULL;
}
}
module_init(amd_uncore_init);
module_exit(amd_uncore_exit);
MODULE_DESCRIPTION("AMD Uncore Driver");
MODULE_LICENSE("GPL v2");