From patchwork Thu Apr 30 14:34:05 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jean-Philippe Brucker X-Patchwork-Id: 11520465 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id ECDB7139A for ; Thu, 30 Apr 2020 14:40:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D5FB520757 for ; Thu, 30 Apr 2020 14:40:27 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="DcrvGlQp" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728040AbgD3Ok1 (ORCPT ); Thu, 30 Apr 2020 10:40:27 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34242 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1727915AbgD3Ok0 (ORCPT ); Thu, 30 Apr 2020 10:40:26 -0400 Received: from mail-wm1-x342.google.com (mail-wm1-x342.google.com [IPv6:2a00:1450:4864:20::342]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 77F93C035494 for ; Thu, 30 Apr 2020 07:40:26 -0700 (PDT) Received: by mail-wm1-x342.google.com with SMTP id k12so2145336wmj.3 for ; Thu, 30 Apr 2020 07:40:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=oH09lE6EyF+7ddnT7acJ3k+jJHyiqaDtNA7hzb2+sc4=; b=DcrvGlQp3aypCcqoN+dkF/d0nkxcpxpMBKeHygdxhq6pA3zd8XZM4QH4aGcjJ/4Tht 9Tqg6MvR7s2TeMD2dsMqnAePywvLPYenkSK2kqY1aeQ5SP9/rKss1+vPSjAOTqdrBVzC 3Hk3sNXrPCV4FacRXsy5+JDyySaQuCd99SZEr2yUC/DEQ+NMzYMOHy2AFCct+xzP/4sC h8tNesK9eh+4jAyMW+Myo5oIfE7BWYBL5NXT4aV3gr63yJiHIm1CQMdWqcy+2LlMGvC5 0q2zH9+Bx3SJDZIJOYsGForK5bwlhaFFDJLuGWuknwxC3tkJTHPS6KG3KsC4W4x0HmYe /uDw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=oH09lE6EyF+7ddnT7acJ3k+jJHyiqaDtNA7hzb2+sc4=; b=Y55VgMALdCXHV76lLixZexu713F6D0hZn88j6ti5bUk7QYIPgWIqoZxLZXA5UUcr+x 2Nqlblfx/YVptI8LPxGw0Mo2JXlPbsmFEejjW6JoxrbN3Av+oyFcyM1t2sAEM9zxhhsf oIsxFQhDEplLD8nFlP5soJcpw+TFYiO206O6jb20BIr7UOPocAGzuBwsTnVo7owl4IG/ hZz9PNcUQ/6VjHA0EC1ZKjB6Z7ezC8YxZR4OI1sgu0HPmsiURU2YqQQWaN6J24KMX5ZL Aegkee5n23RaILQtx7qSodBgw0G/AhvdowdM6yuHDNuYmUl+h2uzLpCGj1y6SHjM8l+3 IVAg== X-Gm-Message-State: AGi0PuZqqEKwrEnYtc0Q/yefTzet01SJ9oX+UukPQ6P75RNdlIJZGGt4 wSs4Lm4lthd0zSe49mu7qcz6Og== X-Google-Smtp-Source: APiQypK39c6e8iviTZ8YwC7ivNBAH/kpcwBHJCtUr7sjyJdgvl1DlUReTsvBACR1UGiEnN8Ql6GmcA== X-Received: by 2002:a1c:e302:: with SMTP id a2mr3256603wmh.96.1588257625192; Thu, 30 Apr 2020 07:40:25 -0700 (PDT) Received: from localhost.localdomain ([2001:171b:226e:c200:c43b:ef78:d083:b355]) by smtp.gmail.com with ESMTPSA id n2sm4153286wrt.33.2020.04.30.07.40.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Apr 2020 07:40:24 -0700 (PDT) From: Jean-Philippe Brucker To: iommu@lists.linux-foundation.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-pci@vger.kernel.org, linux-mm@kvack.org Cc: joro@8bytes.org, catalin.marinas@arm.com, will@kernel.org, robin.murphy@arm.com, kevin.tian@intel.com, baolu.lu@linux.intel.com, Jonathan.Cameron@huawei.com, jacob.jun.pan@linux.intel.com, christian.koenig@amd.com, felix.kuehling@amd.com, zhangfei.gao@linaro.org, jgg@ziepe.ca, xuzaibo@huawei.com, fenghua.yu@intel.com, hch@infradead.org, Jean-Philippe Brucker Subject: [PATCH v6 06/25] arm64: mm: Add asid_gen_match() helper Date: Thu, 30 Apr 2020 16:34:05 +0200 Message-Id: <20200430143424.2787566-7-jean-philippe@linaro.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200430143424.2787566-1-jean-philippe@linaro.org> References: <20200430143424.2787566-1-jean-philippe@linaro.org> MIME-Version: 1.0 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Add a macro to check if an ASID is from the current generation, since a subsequent patch will introduce a third user for this test. Signed-off-by: Jean-Philippe Brucker --- arch/arm64/mm/context.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/arch/arm64/mm/context.c b/arch/arm64/mm/context.c index 9b26f9a88724f..d702d60e64dab 100644 --- a/arch/arm64/mm/context.c +++ b/arch/arm64/mm/context.c @@ -92,6 +92,9 @@ static void set_reserved_asid_bits(void) bitmap_clear(asid_map, 0, NUM_USER_ASIDS); } +#define asid_gen_match(asid) \ + (!(((asid) ^ atomic64_read(&asid_generation)) >> asid_bits)) + static void flush_context(void) { int i; @@ -220,8 +223,7 @@ void check_and_switch_context(struct mm_struct *mm, unsigned int cpu) * because atomic RmWs are totally ordered for a given location. */ old_active_asid = atomic64_read(&per_cpu(active_asids, cpu)); - if (old_active_asid && - !((asid ^ atomic64_read(&asid_generation)) >> asid_bits) && + if (old_active_asid && asid_gen_match(asid) && atomic64_cmpxchg_relaxed(&per_cpu(active_asids, cpu), old_active_asid, asid)) goto switch_mm_fastpath; @@ -229,7 +231,7 @@ void check_and_switch_context(struct mm_struct *mm, unsigned int cpu) raw_spin_lock_irqsave(&cpu_asid_lock, flags); /* Check that our ASID belongs to the current generation. */ asid = atomic64_read(&mm->context.id); - if ((asid ^ atomic64_read(&asid_generation)) >> asid_bits) { + if (!asid_gen_match(asid)) { asid = new_context(mm); atomic64_set(&mm->context.id, asid); }