From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752094AbeECKPD (ORCPT ); Thu, 3 May 2018 06:15:03 -0400 Received: from mga03.intel.com ([134.134.136.65]:44397 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751825AbeECKO6 (ORCPT ); Thu, 3 May 2018 06:14:58 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.49,358,1520924400"; d="scan'208";a="38109774" From: Luwei Kang To: kvm@vger.kernel.org Cc: tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, x86@kernel.org, pbonzini@redhat.com, rkrcmar@redhat.com, linux-kernel@vger.kernel.org, joro@8bytes.org, peterz@infradead.org, chao.p.peng@linux.intel.com, Luwei Kang Subject: [PATCH v7 05/13] perf/x86/intel/pt: Introduce a new function to get capability of Intel PT Date: Thu, 3 May 2018 20:08:35 +0800 Message-Id: <1525349323-9938-6-git-send-email-luwei.kang@intel.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1525349323-9938-1-git-send-email-luwei.kang@intel.com> References: <1525349323-9938-1-git-send-email-luwei.kang@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org New function __pt_cap_get() will be invoked in KVM to check if a specific capability is availiable in KVM guest. Another function pt_cap_get() can only check the hardware capabilities but this may different with KVM guest because some features may not be exposed to guest. Signed-off-by: Luwei Kang --- arch/x86/events/intel/pt.c | 10 ++++++++-- arch/x86/include/asm/intel_pt.h | 2 ++ 2 files changed, 10 insertions(+), 2 deletions(-) diff --git a/arch/x86/events/intel/pt.c b/arch/x86/events/intel/pt.c index d5819a2..a1fe6ff 100644 --- a/arch/x86/events/intel/pt.c +++ b/arch/x86/events/intel/pt.c @@ -76,14 +76,20 @@ PT_CAP(psb_periods, 1, CPUID_EBX, 0xffff0000), }; -u32 pt_cap_get(enum pt_capabilities cap) +u32 __pt_cap_get(u32 *caps, enum pt_capabilities cap) { struct pt_cap_desc *cd = &pt_caps[cap]; - u32 c = pt_pmu.caps[cd->leaf * PT_CPUID_REGS_NUM + cd->reg]; + u32 c = caps[cd->leaf * PT_CPUID_REGS_NUM + cd->reg]; unsigned int shift = __ffs(cd->mask); return (c & cd->mask) >> shift; } +EXPORT_SYMBOL_GPL(__pt_cap_get); + +u32 pt_cap_get(enum pt_capabilities cap) +{ + return __pt_cap_get(pt_pmu.caps, cap); +} EXPORT_SYMBOL_GPL(pt_cap_get); static ssize_t pt_cap_show(struct device *cdev, diff --git a/arch/x86/include/asm/intel_pt.h b/arch/x86/include/asm/intel_pt.h index 2de4db0..3a4f524 100644 --- a/arch/x86/include/asm/intel_pt.h +++ b/arch/x86/include/asm/intel_pt.h @@ -27,9 +27,11 @@ enum pt_capabilities { #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_CPU_SUP_INTEL) void cpu_emergency_stop_pt(void); extern u32 pt_cap_get(enum pt_capabilities cap); +extern u32 __pt_cap_get(u32 *caps, enum pt_capabilities cap); #else static inline void cpu_emergency_stop_pt(void) {} static inline u32 pt_cap_get(enum pt_capabilities cap) { return 0; } +static u32 __pt_cap_get(u32 *caps, enum pt_capabilities cap) { return 0; } #endif #endif /* _ASM_X86_INTEL_PT_H */ -- 1.8.3.1