From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-yw1-f201.google.com (mail-yw1-f201.google.com [209.85.128.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E30B4179652 for ; Fri, 30 Aug 2024 11:03:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725015840; cv=none; b=EkV08bDrIHPYSzQQ2z/07/2rvE05hLPJzO8TksS+CxRXou3Q36oENuauH7qOVRuCmZaFLMUujJc/SsvnlzoLhwEak+TsdrgLGhD3gJ40NrGR4xrl1nfrLfID4PTIMvvLteSvrAFzXy0+2CtH2gu4gXEagJRgS5K3fy9uONJp7BY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725015840; c=relaxed/simple; bh=0ffy6KqD2ZsBlubMNAmxaGladd4Gg5hkg0zx+QhJMCU=; h=Date:Mime-Version:Message-ID:Subject:From:To:Cc:Content-Type; b=AtQkWMTgvlgoYLAgGFud+DzQ37gLBBlSxjhAo80HntGdQqy0dIXUK4gjItn+NqP32qLmw6fDv8LpRA8YUhiUzNcjwSJlI/Bx70FnpMZ1XlM4f26arVPMb91Caru3JZMwIiXaHCH+DFVl8hkWLbtFmf+ybo+mEmVVSfinNmiB7M4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--smostafa.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=wXGJ7gi2; arc=none smtp.client-ip=209.85.128.201 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--smostafa.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="wXGJ7gi2" Received: by mail-yw1-f201.google.com with SMTP id 00721157ae682-6d3e062dbeeso8805237b3.0 for ; Fri, 30 Aug 2024 04:03:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1725015838; x=1725620638; darn=vger.kernel.org; h=content-transfer-encoding:cc:to:from:subject:message-id :mime-version:date:from:to:cc:subject:date:message-id:reply-to; bh=obthWJJQx048EnN2AOC6zuK5QgHhreZNXc1GxoMBMd4=; b=wXGJ7gi22eQAnN+MisYtiYF5VweiCqk3vahimD1iifKVvHrm95qeocOmcCnhBKk72V tzLm9dx/sFEx0RS16FlG/f04fLAiBB21mqi6jvj8HT6fKL8sxIv+alW8BGCAaR7+mWKS i5YcnIfwk4ZXGxY7DHhsj9Uw97WX2MtHC8VXzxPXenvTTpsfSAIv1do/PFFKx5twkLek keSxRbJuCYDkVMS8O6cSx2eO0Um8w2cQAxIju7jVcgPTPBZci1AT5K0t4EWdAhC+ZPkl qizqWQHehoylQbpmxGLDPJSw8qrVqikHzM+/VOidhptL7jeGqHRFE8opFZVZyFBwiPUB xSBg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1725015838; x=1725620638; h=content-transfer-encoding:cc:to:from:subject:message-id :mime-version:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=obthWJJQx048EnN2AOC6zuK5QgHhreZNXc1GxoMBMd4=; b=mkxmV95Sg/BMbqoWl5ujtfeVdcBxqPmTkDyOHJJ56dH5waqJMFelS+ne6MetfVL1yC HcEsI9P5nI51HXDaw3oqIPayXTOdHl5fdztXHQUNikYiBAEvlimykF/eNu2zdMdD48+7 jnCJ1Ax861/rsvwQJCGJbqlG/UDgqeaY1V2MJxXzAx8If2rmSOY2hsKLIZKMgL+tRfna 8lVkUfdRqFZU1WzPGsQcfO30xJ+wn/gN8J3wrkwjjxR54ubJhTZXpwDk+pweaGhToj8g LicgzhyYHNw4aN6BFC2eaQN+IylEdrE5LNBBlq3QnHhZQguclf+rkqyO+UauTdJ8sTlI 5L/A== X-Gm-Message-State: AOJu0Yxa8hwnpcJd62xBmFQodnwNlwmMEuVxRRF/sQoUOQhixUta/GNs hwKSq3hMxom5AsbNnM0CUleLs6q/F2B95njqS3Ut/AxwepRr0Y8jt/ZWG3FZjZEvxJ90R+YMpY+ A0TEMEtTEoV7tl6fmPpjJJE71nBGiEZjLPnQD0P7YYvdXVz7TvWNbf6eWMcFEXDKhSjhx20Ho7J 6lA3VcL6b2tjCOhWk+iJ9TASzZ23VSHASpyljMIgY+e02FDCpKGKw= X-Google-Smtp-Source: AGHT+IHkyHjn4rwsHHaBZz13oCcDK5Wif55SRe6/R2eIzxGkPl4d+94YtRJamqf/F9SQM1XvqVn7meehMJtJLw== X-Received: from mostafa.c.googlers.com ([fda3:e722:ac3:cc00:28:9cb1:c0a8:333c]) (user=smostafa job=sendgmr) by 2002:a81:cb0d:0:b0:651:2eea:4dfe with SMTP id 00721157ae682-6d2818a64f4mr1646297b3.0.1725015837461; Fri, 30 Aug 2024 04:03:57 -0700 (PDT) Date: Fri, 30 Aug 2024 11:03:46 +0000 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 X-Mailer: git-send-email 2.46.0.469.g59c65b2a67-goog Message-ID: <20240830110349.797399-1-smostafa@google.com> Subject: [PATCH v4 0/2] Fix handling of S2 stalls From: Mostafa Saleh To: linux-kernel@vger.kernel.org, iommu@lists.linux.dev, linux-arm-kernel@lists.infradead.org, will@kernel.org, robin.murphy@arm.com, joro@8bytes.org Cc: jean-philippe@linaro.org, jgg@ziepe.ca, nicolinc@nvidia.com, mshavit@google.com, Mostafa Saleh Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable While debugging something else, I spent hours looking at hexdumps of STEs, CDs and commands while comparing them against the arch specs, where I noticed a minor violation in the driver regarding handling of S2S bit in the STE. This has been there for ages, so it=E2=80=99s highly unlikely that any HW (= if it exists with such features) running Linux is affected. I don=E2=80=99t have access to HW with stalls so I just tested normal usage and (terminated) translation fault events. Also, add some unit tests for stall enabled masters. Mostafa Saleh (2): iommu/arm-smmu-v3: Match Stall behaviour for S2 iommu/arm-smmu-v3-test: Test masters with stall enabled .../iommu/arm/arm-smmu-v3/arm-smmu-v3-test.c | 83 ++++++++++++++----- drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 8 +- drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 1 + 3 files changed, 66 insertions(+), 26 deletions(-) v4: - Add S2S bit to get_used for stage-2 - Add unit tests for masters with stall enabled v3: - Set S2S for s2 and not s1 domain - Ignore ats check v2: - Fix index of the STE - Fix conflict with ATS - Squash the 2 patches and drop enable_nesting --=20 2.46.0.469.g59c65b2a67-goog