From patchwork Wed Jun 22 16:22:29 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Kirill A . Shutemov" X-Patchwork-Id: 12891141 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7308EC433EF for ; Wed, 22 Jun 2022 16:23:15 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 4AFD08E00C7; Wed, 22 Jun 2022 12:23:10 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 3CD578E00C9; Wed, 22 Jun 2022 12:23:10 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id DBA7F8E00CA; Wed, 22 Jun 2022 12:23:09 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0015.hostedemail.com [216.40.44.15]) by kanga.kvack.org (Postfix) with ESMTP id A3B348E00C7 for ; Wed, 22 Jun 2022 12:23:09 -0400 (EDT) Received: from smtpin22.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay01.hostedemail.com (Postfix) with ESMTP id 7F0E2610D8 for ; Wed, 22 Jun 2022 16:23:09 +0000 (UTC) X-FDA: 79606391298.22.696F9B1 Received: from mga09.intel.com (mga09.intel.com [134.134.136.24]) by imf31.hostedemail.com (Postfix) with ESMTP id 4D838200BF for ; Wed, 22 Jun 2022 16:23:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1655914980; x=1687450980; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=CU7rCkgXezI1vM2ho8MmDRIt7VouvlyZWqM/6FmVbeI=; b=I2PQlnvKkzBh+XWn0ETT5+HcimUq1N+3EdRZVHZsekavJSN58dy0gNbK 7ef/5JUIJUmMcUQidbb+2LuECvmABPAgS00dvYjRQQb2He9ZUtKdVo/wp JniJNL+M4ODUGFBBGKUiWxyrCFyVooWSiMQgBCiVC97SuJCbXarKmUIKA ElSr6CPf97YtaAVgdr847t0hkaqp54mQMRMsMn3QHFgDJlZ2U9OUCIIOV GWkxUQdiuFvj36Ltdjf886bDUMLCrCO2kMWRKQQEUMkPj1WVbAXHWoJMX wR7nZcgeYHzUZDTf+1W85qBjF6AatORxwybkH7vE1gHIUUgp8vn8HeCHv g==; X-IronPort-AV: E=McAfee;i="6400,9594,10386"; a="281197133" X-IronPort-AV: E=Sophos;i="5.92,212,1650956400"; d="scan'208";a="281197133" Received: from orsmga005.jf.intel.com ([10.7.209.41]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Jun 2022 09:22:46 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.92,212,1650956400"; d="scan'208";a="764947851" Received: from black.fi.intel.com ([10.237.72.28]) by orsmga005.jf.intel.com with ESMTP; 22 Jun 2022 09:22:42 -0700 Received: by black.fi.intel.com (Postfix, from userid 1000) id 6A3F813C; Wed, 22 Jun 2022 19:22:43 +0300 (EEST) From: "Kirill A. Shutemov" To: Dave Hansen , Andy Lutomirski , Peter Zijlstra Cc: x86@kernel.org, Kostya Serebryany , Andrey Ryabinin , Andrey Konovalov , Alexander Potapenko , Dmitry Vyukov , "H . J . Lu" , Andi Kleen , Rick Edgecombe , linux-mm@kvack.org, linux-kernel@vger.kernel.org, "Kirill A. Shutemov" Subject: [PATCHv4 7/8] x86: Expose untagging mask in /proc/$PID/arch_status Date: Wed, 22 Jun 2022 19:22:29 +0300 Message-Id: <20220622162230.83474-8-kirill.shutemov@linux.intel.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220622162230.83474-1-kirill.shutemov@linux.intel.com> References: <20220622162230.83474-1-kirill.shutemov@linux.intel.com> MIME-Version: 1.0 ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1655914988; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=8sHzApz0U4GqrOry5rOpp/aBVVPvCQ+NT3OLeXRMYEg=; b=tBaL6sAXTR3EztHppol0mqZR6jjK0+zIAjJzSQFpy1V2Tyq9sTAeriGtTmptUIs4/51LWA wKUUsbD9itA1A+HHffM/hOPJe0y1UCh72n31omTcYapWnj53Z0HwwG+Rrs/AKtyeTW2YcG eBhh+4sPWB9/J9qhpZwvVvj3wFYYdRw= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1655914988; a=rsa-sha256; cv=none; b=AwsZrI4f/4DJRY7ikUBir4ppxFy2efPZhoYEkeWXysdpo6K4I6mSE3+d4PhJpqF04cB/F5 N9ubbDD7I4yZ9j1rUjfrNUisvdgd0y6F/U6thLWX6qlvMdIM+Rdzlt0j7hqWx/rh4wFW3j h5TJUuY6N5JCAaUG9vqBEFmJuQADebg= ARC-Authentication-Results: i=1; imf31.hostedemail.com; dkim=pass header.d=intel.com header.s=Intel header.b=I2PQlnvK; dmarc=pass (policy=none) header.from=intel.com; spf=none (imf31.hostedemail.com: domain of kirill.shutemov@linux.intel.com has no SPF policy when checking 134.134.136.24) smtp.mailfrom=kirill.shutemov@linux.intel.com X-Stat-Signature: ytq4f4hajy6gtg385p6fzuz33enb6b3b X-Rspamd-Queue-Id: 4D838200BF Authentication-Results: imf31.hostedemail.com; dkim=pass header.d=intel.com header.s=Intel header.b=I2PQlnvK; dmarc=pass (policy=none) header.from=intel.com; spf=none (imf31.hostedemail.com: domain of kirill.shutemov@linux.intel.com has no SPF policy when checking 134.134.136.24) smtp.mailfrom=kirill.shutemov@linux.intel.com X-Rspamd-Server: rspam02 X-Rspam-User: X-HE-Tag: 1655914980-9386 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Add a line in /proc/$PID/arch_status to report untag_mask. It can be used to find out LAM status of the process from the outside. It is useful for debuggers. Signed-off-by: Kirill A. Shutemov --- arch/x86/include/asm/mmu_context.h | 10 +++++ arch/x86/kernel/Makefile | 2 + arch/x86/kernel/fpu/xstate.c | 47 ----------------------- arch/x86/kernel/proc.c | 60 ++++++++++++++++++++++++++++++ 4 files changed, 72 insertions(+), 47 deletions(-) create mode 100644 arch/x86/kernel/proc.c diff --git a/arch/x86/include/asm/mmu_context.h b/arch/x86/include/asm/mmu_context.h index 05821534aadc..a6cded0f5e64 100644 --- a/arch/x86/include/asm/mmu_context.h +++ b/arch/x86/include/asm/mmu_context.h @@ -103,6 +103,11 @@ static inline void dup_lam(struct mm_struct *oldmm, struct mm_struct *mm) mm->context.untag_mask = oldmm->context.untag_mask; } +static inline unsigned long mm_untag_mask(struct mm_struct *mm) +{ + return mm->context.untag_mask; +} + static inline void mm_reset_untag_mask(struct mm_struct *mm) { mm->context.untag_mask = -1UL; @@ -119,6 +124,11 @@ static inline void dup_lam(struct mm_struct *oldmm, struct mm_struct *mm) { } +static inline unsigned long mm_untag_mask(struct mm_struct *mm) +{ + return -1UL; +} + static inline void mm_reset_untag_mask(struct mm_struct *mm) { } diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile index 4c8b6ae802ac..313f1d8e7783 100644 --- a/arch/x86/kernel/Makefile +++ b/arch/x86/kernel/Makefile @@ -141,6 +141,8 @@ obj-$(CONFIG_UNWINDER_GUESS) += unwind_guess.o obj-$(CONFIG_AMD_MEM_ENCRYPT) += sev.o +obj-$(CONFIG_PROC_FS) += proc.o + ### # 64 bit specific files ifeq ($(CONFIG_X86_64),y) diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c index c8340156bfd2..838a6f0627fd 100644 --- a/arch/x86/kernel/fpu/xstate.c +++ b/arch/x86/kernel/fpu/xstate.c @@ -10,8 +10,6 @@ #include #include #include -#include -#include #include #include @@ -1745,48 +1743,3 @@ long fpu_xstate_prctl(int option, unsigned long arg2) return -EINVAL; } } - -#ifdef CONFIG_PROC_PID_ARCH_STATUS -/* - * Report the amount of time elapsed in millisecond since last AVX512 - * use in the task. - */ -static void avx512_status(struct seq_file *m, struct task_struct *task) -{ - unsigned long timestamp = READ_ONCE(task->thread.fpu.avx512_timestamp); - long delta; - - if (!timestamp) { - /* - * Report -1 if no AVX512 usage - */ - delta = -1; - } else { - delta = (long)(jiffies - timestamp); - /* - * Cap to LONG_MAX if time difference > LONG_MAX - */ - if (delta < 0) - delta = LONG_MAX; - delta = jiffies_to_msecs(delta); - } - - seq_put_decimal_ll(m, "AVX512_elapsed_ms:\t", delta); - seq_putc(m, '\n'); -} - -/* - * Report architecture specific information - */ -int proc_pid_arch_status(struct seq_file *m, struct pid_namespace *ns, - struct pid *pid, struct task_struct *task) -{ - /* - * Report AVX512 state if the processor and build option supported. - */ - if (cpu_feature_enabled(X86_FEATURE_AVX512F)) - avx512_status(m, task); - - return 0; -} -#endif /* CONFIG_PROC_PID_ARCH_STATUS */ diff --git a/arch/x86/kernel/proc.c b/arch/x86/kernel/proc.c new file mode 100644 index 000000000000..9765b4d05ce4 --- /dev/null +++ b/arch/x86/kernel/proc.c @@ -0,0 +1,60 @@ +// SPDX-License-Identifier: GPL-2.0-only +#include +#include +#include +#include +#include + +/* + * Report the amount of time elapsed in millisecond since last AVX512 + * use in the task. + */ +static void avx512_status(struct seq_file *m, struct task_struct *task) +{ + unsigned long timestamp = READ_ONCE(task->thread.fpu.avx512_timestamp); + long delta; + + if (!timestamp) { + /* + * Report -1 if no AVX512 usage + */ + delta = -1; + } else { + delta = (long)(jiffies - timestamp); + /* + * Cap to LONG_MAX if time difference > LONG_MAX + */ + if (delta < 0) + delta = LONG_MAX; + delta = jiffies_to_msecs(delta); + } + + seq_put_decimal_ll(m, "AVX512_elapsed_ms:\t", delta); + seq_putc(m, '\n'); +} + +/* + * Report architecture specific information + */ +int proc_pid_arch_status(struct seq_file *m, struct pid_namespace *ns, + struct pid *pid, struct task_struct *task) +{ + struct mm_struct *mm; + unsigned long untag_mask = -1UL; + + /* + * Report AVX512 state if the processor and build option supported. + */ + if (cpu_feature_enabled(X86_FEATURE_AVX512F)) + avx512_status(m, task); + + mm = get_task_mm(task); + if (mm) { + untag_mask = mm_untag_mask(task->mm); + mmput(mm); + } + + seq_printf(m, "untag_mask:\t%#lx\n", untag_mask); + + return 0; +}