From nobody Tue Feb 10 14:25:57 2026 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.10]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E668B31B810; Mon, 9 Feb 2026 07:26:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.10 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770621970; cv=none; b=dgVnRmS/cvgwGmKFnvuRJ/nLES+gjut/y+kPrW0ZG/GFnE495n7uaIUnBqGNIJP8o9W8IB4FXsYVzMfNjoKovOnp2rkAwFHajBKYbe8tew7ZS9kJ4PuS4dLk8BvAFxBOgI5d04oEiXI23sNWcccrdIv1JyT4ixMdea689gI8bxM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770621970; c=relaxed/simple; bh=PHKbcMfar062pK5khryyeDK66m32OOkgPaAuNjwnWRE=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=h8jGVoYZ+yWF4JpGOLeko7i5qaHoBeiOCPgxu4BHhZAzMuGMnFLSiTB8Fo/qTZMTkIsFFq9S84jqSyGgzsv/ndDEQ539dGCNxKSwY5JJ3dmEs4x+J9j5KgQMQuvzJlMGtcOewqm6F1VWRxm2wMKfQ86IUhx0CijC9Pm9essM0+s= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=pass smtp.mailfrom=linux.intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=Gp7BcsRm; arc=none smtp.client-ip=192.198.163.10 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="Gp7BcsRm" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1770621970; x=1802157970; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=PHKbcMfar062pK5khryyeDK66m32OOkgPaAuNjwnWRE=; b=Gp7BcsRmXNvQLqOnkbbKXQ31weRqNTwP4kVeAWnb9JaE0Kk1x1ilQ/yZ L/H6JHZ5O6I1OidHgzmZfuS7wRU+nmLKnEB5afAaR9WamC7nR+KMtZD3J aDUki/czVHaNGhlHLRkv2KcWoWaWmzyVlLCaGfplh5FHhZNWYM9IF+MbV /AxCJQosHOaYP3uVne5nQqONjq6+PXLy0ipFNz33HqNAWOLD0f5bV3Be0 QhafkDIwWddOiw3A/ECV+cPkbL+wvGksbowSzvI5mBMfoohVvb4tREfbR Kb7Vk22kahmAWI86RFMvhFE7ykIL5F0Il+mI05IJ9ET732tgyW+1yiVum A==; X-CSE-ConnectionGUID: st0bM7bsSYCnXFee1rFqmg== X-CSE-MsgGUID: ZmdZ33y+T++sXWkiprWlOg== X-IronPort-AV: E=McAfee;i="6800,10657,11695"; a="83098509" X-IronPort-AV: E=Sophos;i="6.21,281,1763452800"; d="scan'208";a="83098509" Received: from fmviesa001.fm.intel.com ([10.60.135.141]) by fmvoesa104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 Feb 2026 23:26:10 -0800 X-CSE-ConnectionGUID: 3v0V3odgR0SPEIUWvNdLBQ== X-CSE-MsgGUID: OW7cLhz0T1Ctx6ekvtq6oQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.21,281,1763452800"; d="scan'208";a="241694770" Received: from spr.sh.intel.com ([10.112.229.196]) by fmviesa001.fm.intel.com with ESMTP; 08 Feb 2026 23:26:05 -0800 From: Dapeng Mi To: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Thomas Gleixner , Dave Hansen , Ian Rogers , Adrian Hunter , Jiri Olsa , Alexander Shishkin , Andi Kleen , Eranian Stephane Cc: Mark Rutland , broonie@kernel.org, Ravi Bangoria , linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, Zide Chen , Falcon Thomas , Dapeng Mi , Xudong Hao , Kan Liang , Dapeng Mi Subject: [Patch v6 16/22] perf/x86: Enable OPMASK sampling using sample_simd_pred_reg_* fields Date: Mon, 9 Feb 2026 15:20:41 +0800 Message-Id: <20260209072047.2180332-17-dapeng1.mi@linux.intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260209072047.2180332-1-dapeng1.mi@linux.intel.com> References: <20260209072047.2180332-1-dapeng1.mi@linux.intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Kan Liang This patch adds support for sampling OPAMSK registers via the sample_simd_pred_reg_* fields. Each OPMASK register consists of 1 u64 word. Current x86 hardware supports 8 OPMASK registers. The perf_simd_reg_value() function is responsible for outputting OPMASK value to userspace. Additionally, sample_simd_pred_reg_qwords should be set to 1 to indicate OPMASK sampling. Signed-off-by: Kan Liang Co-developed-by: Dapeng Mi Signed-off-by: Dapeng Mi --- arch/x86/events/core.c | 8 ++++++++ arch/x86/events/perf_event.h | 10 ++++++++++ arch/x86/include/asm/perf_event.h | 4 ++++ arch/x86/include/uapi/asm/perf_regs.h | 5 +++++ arch/x86/kernel/perf_regs.c | 15 ++++++++++++--- 5 files changed, 39 insertions(+), 3 deletions(-) diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c index b279dfc1c97f..2a674436f07e 100644 --- a/arch/x86/events/core.c +++ b/arch/x86/events/core.c @@ -729,6 +729,9 @@ int x86_pmu_hw_config(struct perf_event *event) if (event_needs_high16_zmm(event) && !(x86_pmu.ext_regs_mask & XFEATURE_MASK_Hi16_ZMM)) return -EINVAL; + if (event_needs_opmask(event) && + !(x86_pmu.ext_regs_mask & XFEATURE_MASK_OPMASK)) + return -EINVAL; } } =20 @@ -1856,6 +1859,7 @@ inline void x86_pmu_clear_perf_regs(struct pt_regs *r= egs) perf_regs->ymmh_regs =3D NULL; perf_regs->zmmh_regs =3D NULL; perf_regs->h16zmm_regs =3D NULL; + perf_regs->opmask_regs =3D NULL; } =20 static inline void __x86_pmu_sample_ext_regs(u64 mask) @@ -1887,6 +1891,8 @@ static inline void x86_pmu_update_ext_regs(struct x86= _perf_regs *perf_regs, perf_regs->zmmh =3D get_xsave_addr(xsave, XFEATURE_ZMM_Hi256); if (mask & XFEATURE_MASK_Hi16_ZMM) perf_regs->h16zmm =3D get_xsave_addr(xsave, XFEATURE_Hi16_ZMM); + if (mask & XFEATURE_MASK_OPMASK) + perf_regs->opmask =3D get_xsave_addr(xsave, XFEATURE_OPMASK); } =20 /* @@ -1952,6 +1958,8 @@ static void x86_pmu_sample_extended_regs(struct perf_= event *event, mask |=3D XFEATURE_MASK_ZMM_Hi256; if (event_needs_high16_zmm(event)) mask |=3D XFEATURE_MASK_Hi16_ZMM; + if (event_needs_opmask(event)) + mask |=3D XFEATURE_MASK_OPMASK; =20 mask &=3D x86_pmu.ext_regs_mask; if (sample_type & PERF_SAMPLE_REGS_USER) { diff --git a/arch/x86/events/perf_event.h b/arch/x86/events/perf_event.h index f6379adb8e83..c9d6379c4ddb 100644 --- a/arch/x86/events/perf_event.h +++ b/arch/x86/events/perf_event.h @@ -177,6 +177,16 @@ static inline bool event_needs_high16_zmm(struct perf_= event *event) return false; } =20 +static inline bool event_needs_opmask(struct perf_event *event) +{ + if (event->attr.sample_simd_regs_enabled && + (event->attr.sample_simd_pred_reg_intr || + event->attr.sample_simd_pred_reg_user)) + return true; + + return false; +} + struct amd_nb { int nb_id; /* NorthBridge id */ int refcnt; /* reference count */ diff --git a/arch/x86/include/asm/perf_event.h b/arch/x86/include/asm/perf_= event.h index a57386ae70d9..6c5a34e0dfc8 100644 --- a/arch/x86/include/asm/perf_event.h +++ b/arch/x86/include/asm/perf_event.h @@ -726,6 +726,10 @@ struct x86_perf_regs { u64 *h16zmm_regs; struct avx_512_hi16_state *h16zmm; }; + union { + u64 *opmask_regs; + struct avx_512_opmask_state *opmask; + }; }; =20 extern unsigned long perf_arch_instruction_pointer(struct pt_regs *regs); diff --git a/arch/x86/include/uapi/asm/perf_regs.h b/arch/x86/include/uapi/= asm/perf_regs.h index d6362bc8d125..dae39df134ec 100644 --- a/arch/x86/include/uapi/asm/perf_regs.h +++ b/arch/x86/include/uapi/asm/perf_regs.h @@ -60,13 +60,18 @@ enum { PERF_X86_SIMD_YMM_REGS =3D 16, PERF_X86_SIMD_ZMM_REGS =3D 32, PERF_X86_SIMD_VEC_REGS_MAX =3D PERF_X86_SIMD_ZMM_REGS, + + PERF_X86_SIMD_OPMASK_REGS =3D 8, + PERF_X86_SIMD_PRED_REGS_MAX =3D PERF_X86_SIMD_OPMASK_REGS, }; =20 +#define PERF_X86_SIMD_PRED_MASK GENMASK(PERF_X86_SIMD_PRED_REGS_MAX - 1, 0) #define PERF_X86_SIMD_VEC_MASK GENMASK_ULL(PERF_X86_SIMD_VEC_REGS_MAX - 1,= 0) =20 #define PERF_X86_H16ZMM_BASE 16 =20 enum { + PERF_X86_OPMASK_QWORDS =3D 1, PERF_X86_XMM_QWORDS =3D 2, PERF_X86_YMM_QWORDS =3D 4, PERF_X86_ZMM_QWORDS =3D 8, diff --git a/arch/x86/kernel/perf_regs.c b/arch/x86/kernel/perf_regs.c index fe4ff4d2de88..2e3c10dffb35 100644 --- a/arch/x86/kernel/perf_regs.c +++ b/arch/x86/kernel/perf_regs.c @@ -86,8 +86,14 @@ u64 perf_simd_reg_value(struct pt_regs *regs, int idx, struct x86_perf_regs *perf_regs =3D container_of(regs, struct x86_perf_regs, regs); =20 - if (pred) - return 0; + if (pred) { + if (WARN_ON_ONCE(idx >=3D PERF_X86_SIMD_PRED_REGS_MAX || + qwords_idx >=3D PERF_X86_OPMASK_QWORDS)) + return 0; + if (!perf_regs->opmask_regs) + return 0; + return perf_regs->opmask_regs[idx]; + } =20 if (WARN_ON_ONCE(idx >=3D PERF_X86_SIMD_VEC_REGS_MAX || qwords_idx >=3D PERF_X86_SIMD_QWORDS_MAX)) @@ -138,7 +144,10 @@ int perf_simd_reg_validate(u16 vec_qwords, u64 vec_mas= k, if (vec_mask & ~PERF_X86_SIMD_VEC_MASK) return -EINVAL; } - if (pred_mask) + + if (pred_qwords !=3D PERF_X86_OPMASK_QWORDS) + return -EINVAL; + if (pred_mask & ~PERF_X86_SIMD_PRED_MASK) return -EINVAL; =20 return 0; --=20 2.34.1