From patchwork Mon Jun 21 23:52:45 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Doug Anderson X-Patchwork-Id: 465272 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 91DA9C4743C for ; Mon, 21 Jun 2021 23:53:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7BAA461153 for ; Mon, 21 Jun 2021 23:53:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231486AbhFUXzd (ORCPT ); Mon, 21 Jun 2021 19:55:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45368 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232340AbhFUXzb (ORCPT ); Mon, 21 Jun 2021 19:55:31 -0400 Received: from mail-pl1-x636.google.com (mail-pl1-x636.google.com [IPv6:2607:f8b0:4864:20::636]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 92756C061756 for ; Mon, 21 Jun 2021 16:53:15 -0700 (PDT) Received: by mail-pl1-x636.google.com with SMTP id v12so9440312plo.10 for ; Mon, 21 Jun 2021 16:53:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=1hap5rrkK42QaF5phRIGliKevrZCv+fxjBjTLJ/pE7w=; b=SaTkql2WXjMyJO6whWG9JyCnglGg6faOh30E8Lhu9SgvFGWDGvulc9SplCY+Wx4hJB DCYHUv1GwmTka12BMkZes72rKui1uDoY0LzvsieTa2ZmIrnL4mVCj5E9Nvn0LnsgSd9a klTw+FraV7UJBMyr3e/hUg0h10KaCLpg93/bc= 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=1hap5rrkK42QaF5phRIGliKevrZCv+fxjBjTLJ/pE7w=; b=JIacTP285RAcBkAsJGfBnyRRwX8E4rDS6AAw/nyqDZrHYjxHfc/xM4xwyauj6+4U63 oiDc+bhtcx1oFZtfNSVFcC9VCqxTQU+LwVFrVq7EYs+Fz1CkgT2MnEciz4uAlzVliVLp +cUd8c3seHjXPgAyjrflMYUG36lepGgSn9yeT+CYalOB5Y4x6LC9BrlKZ7ZGIQtmIvAt mb2qX3FmaKrkNXyJ0Y29+4UVTIbVGwcHrjUGGDPtA5aq85GoSomqLUPxqiy19AMiu5By fYOoCzWwapk480kw6s32nX4TWbDDteZtKTEWsxVOKp/9yPG9sT5jsWU+Z9mEXossO4Kd 2LZw== X-Gm-Message-State: AOAM530H+5VpQniGEeuIrfVrozKN10NKrBYiDTRVKt0UcyYebXMUHVXi NJ3tfYcvkQatHmuGIDFcYyJCLw== X-Google-Smtp-Source: ABdhPJwXH5vi0Xs9ZIXNanUJNzJ2JIBdTlSTrxUumm5ORFc6vCcYGBtgB9XO+d3fthNCPEvr8XR/lA== X-Received: by 2002:a17:90a:6be6:: with SMTP id w93mr598015pjj.171.1624319595138; Mon, 21 Jun 2021 16:53:15 -0700 (PDT) Received: from tictac2.mtv.corp.google.com ([2620:15c:202:201:bdc1:a4b1:b06e:91d1]) by smtp.gmail.com with ESMTPSA id s27sm4339663pfg.169.2021.06.21.16.53.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 21 Jun 2021 16:53:14 -0700 (PDT) From: Douglas Anderson To: gregkh@linuxfoundation.org, rafael@kernel.org, rafael.j.wysocki@intel.com, will@kernel.org, robin.murphy@arm.com, joro@8bytes.org, bjorn.andersson@linaro.org, ulf.hansson@linaro.org, adrian.hunter@intel.com, bhelgaas@google.com Cc: robdclark@chromium.org, linux-arm-msm@vger.kernel.org, linux-pci@vger.kernel.org, quic_c_gdjako@quicinc.com, iommu@lists.linux-foundation.org, sonnyrao@chromium.org, saiprakash.ranjan@codeaurora.org, linux-mmc@vger.kernel.org, vbadigan@codeaurora.org, rajatja@google.com, saravanak@google.com, joel@joelfernandes.org, Douglas Anderson , linux-kernel@vger.kernel.org Subject: [PATCH 3/6] PCI: Indicate that we want to force strict DMA for untrusted devices Date: Mon, 21 Jun 2021 16:52:45 -0700 Message-Id: <20210621165230.3.I7accc008905590bb2b46f40f91a4aeda5b378007@changeid> X-Mailer: git-send-email 2.32.0.288.g62a8d224e6-goog In-Reply-To: <20210621235248.2521620-1-dianders@chromium.org> References: <20210621235248.2521620-1-dianders@chromium.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org At the moment the generic IOMMU framework reaches into the PCIe device to check the "untrusted" state and uses this information to figure out if it should be running the IOMMU in strict or non-strict mode. Let's instead set the new boolean in "struct device" to indicate when we want forced strictness. NOTE: we still continue to set the "untrusted" bit in PCIe since that apparently is used for more than just IOMMU strictness. It probably makes sense for a later patchset to clarify all of the other needs we have for "untrusted" PCIe devices (perhaps add more booleans into the "struct device") so we can fully eliminate the need for the IOMMU framework to reach into a PCIe device. Signed-off-by: Douglas Anderson --- drivers/pci/probe.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 275204646c68..8d81f0fb3e50 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -1572,8 +1572,10 @@ static void set_pcie_untrusted(struct pci_dev *dev) * untrusted as well. */ parent = pci_upstream_bridge(dev); - if (parent && (parent->untrusted || parent->external_facing)) + if (parent && (parent->untrusted || parent->external_facing)) { dev->untrusted = true; + dev->dev.force_strict_iommu = true; + } } /**