The following commit has been merged into the perf/core branch of tip: Commit-ID: 50b46ab90f7c43a1adcc9099211b7447818d446e Gitweb: https://git.kernel.org/tip/50b46ab90f7c43a1adcc9099211b7447818d446e Author: Kim Phillips <kim.phillips@xxxxxxx> AuthorDate: Tue, 17 Aug 2021 17:10:47 -05:00 Committer: Peter Zijlstra <peterz@xxxxxxxxxxxxx> CommitterDate: Fri, 20 Aug 2021 12:33:13 +02:00 perf/amd/uncore: Allow the driver to be built as a module Add support to build the AMD uncore driver as a module. This is in order to facilitate development. Signed-off-by: Kim Phillips <kim.phillips@xxxxxxx> Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx> Link: https://lore.kernel.org/r/20210817221048.88063-8-kim.phillips@xxxxxxx --- arch/x86/events/Kconfig | 10 ++++++++++ arch/x86/events/amd/Makefile | 5 +++-- arch/x86/events/amd/uncore.c | 28 +++++++++++++++++++++++++++- 3 files changed, 40 insertions(+), 3 deletions(-) diff --git a/arch/x86/events/Kconfig b/arch/x86/events/Kconfig index 39d9ded..d6cdfe6 100644 --- a/arch/x86/events/Kconfig +++ b/arch/x86/events/Kconfig @@ -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 diff --git a/arch/x86/events/amd/Makefile b/arch/x86/events/amd/Makefile index fe8795a..6cbe38d 100644 --- a/arch/x86/events/amd/Makefile +++ b/arch/x86/events/amd/Makefile @@ -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 - diff --git a/arch/x86/events/amd/uncore.c b/arch/x86/events/amd/uncore.c index a01f9f1..0d04414 100644 --- a/arch/x86/events/amd/uncore.c +++ b/arch/x86/events/amd/uncore.c @@ -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");
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