From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AB8JxZq/Dpcizj+cMuEc2YT4t/mIkxvYq3CPFYQy7v4UtoOVm8BN80UuUHmncpQCs3MaTg2kSAZo ARC-Seal: i=1; a=rsa-sha256; t=1526288595; cv=none; d=google.com; s=arc-20160816; b=tqaGXooaBg6Lqgrbsoptj/s/A8reFxSJXNlxe6l30akBJ7QskfrF3m4btywEVMwYfa xEdd8VkKc5lFM+owdsWrPsCJNIzp3HE6ZwdEgbsUbOWiWty6nKtQ53gUP8i5hvqNYZCF j3fbnajglkS0PGcxea7CCGyfh/WS183+uRGcTeP9mNKXpj0/bwaGrY35LJ+p7csODDt8 gE5WipfZYxIqTMieenalJUP4mfCiFKgD+MEnMxWcQfQozEh0K+u/sSgjxWh+Q+VgQVKg D15LjBZ3gk87Jxrb9ZeL48zT0zm3ZxTDgqs8Bqig387pTM3riFn5qaC0BAVF8sGqQoAu inFg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=references:in-reply-to:message-id:date:subject:cc:to:from :arc-authentication-results; bh=HesOCEyxFqq3MsNFsdYebCiWzMTq5BkyrPLXLMYsNqw=; b=T1olsCPivRdjiigAo+/hjECXLykB0IHaCwbt0NhsTvkp3vF+a6MuHnlXbLjTYmFW8U SA3OL/D+m7+PXEh7mV8kIWXlJQQvmwgqkv8/aKT9hsv+a4Iyz31GqWtNsxu4/fNULisH wLfcjpkK5gyNPXoGhz4Sbwld2oNlJKTeIfJVCDg/V8ZWQrI8KxZ+XRslkv/1h1ZRqzGm OpTFThILbsI5RAmNum52Z779oZC8DqAEojf8qrr8KJRuL5jNN6dMbD4VB2WZbfujqzdm 4UfsPQY21HjwZjKGmrgbT45mu/s+9844TRfDiKOFwjCtWNhzek1VWxu+NZHakRluNfSr s2Dw== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of luwei.kang@intel.com designates 134.134.136.20 as permitted sender) smtp.mailfrom=luwei.kang@intel.com Authentication-Results: mx.google.com; spf=pass (google.com: domain of luwei.kang@intel.com designates 134.134.136.20 as permitted sender) smtp.mailfrom=luwei.kang@intel.com X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.49,399,1520924400"; d="scan'208";a="39701885" From: Luwei Kang To: kvm@vger.kernel.org Cc: tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, x86@kernel.org, chao.p.peng@linux.intel.com, thomas.lendacky@amd.com, bp@suse.de, Kan.liang@intel.com, Janakarajan.Natarajan@amd.com, dwmw@amazon.co.uk, linux-kernel@vger.kernel.org, alexander.shishkin@linux.intel.com, peterz@infradead.org, mathieu.poirier@linaro.org, kstewart@linuxfoundation.org, gregkh@linuxfoundation.org, pbonzini@redhat.com, rkrcmar@redhat.com, david@redhat.com, bsd@redhat.com, yu.c.zhang@linux.intel.com, joro@8bytes.org, Luwei Kang Subject: [PATCH v8 05/12] perf/x86/intel/pt: Introduce a new function to get capability of Intel PT Date: Mon, 14 May 2018 18:57:05 +0800 Message-Id: <1526295432-20640-6-git-send-email-luwei.kang@intel.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1526295432-20640-1-git-send-email-luwei.kang@intel.com> References: <1526295432-20640-1-git-send-email-luwei.kang@intel.com> X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1600429589797335754?= X-GMAIL-MSGID: =?utf-8?q?1600429589797335754?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: New function pt_cap_decode() will be invoked in KVM to check if a specific capability is available 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 f65f97a..18a2e80 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_decode(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_decode); + +u32 pt_cap_get(enum pt_capabilities cap) +{ + return pt_cap_decode(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..9c71453 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_decode(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_decode(u32 *caps, enum pt_capabilities cap) { return 0; } #endif #endif /* _ASM_X86_INTEL_PT_H */ -- 1.8.3.1