From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-yw1-f202.google.com (mail-yw1-f202.google.com [209.85.128.202]) (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 76C9283CD3 for ; Mon, 13 May 2024 21:54:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.202 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715637280; cv=none; b=t5X66vkNnKe3xlmdVFS+J7DkOd5ODSQ4yWGfEDIbic2Xgb1Q8xlbjMWsBGq4luvbbDr/WhcacaNBjM9Zv0vJzu15RmUpAssBumzM+KqjAiCzsNSthskGrv5MdZI7FiLd2fAsUA+OHNJMvaRRzDYIA4qYuy96dAcgC1/XbgQkyk0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715637280; c=relaxed/simple; bh=PGx7jAlb854zlrbJriM88KSJOdVA+QqeMq4AogsG2Kw=; h=Date:Mime-Version:Message-ID:Subject:From:To:Cc:Content-Type; b=o4eYE+75p0JNHvcUKs4mfyo1GQamNH/lK3G+uCw4HzWnrJf/Btm8rMD+wrvj0GqIJF1R+sD6916PYcrDGrbFaSMN9Z/g508FKqDRtgPYlJuQege578sfv8k9TQwYvO16tOBXy5pQYPsZjv825GW0osf/YYfOhv38isYaQgWjcBI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--danielmentz.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=gkS9Mz89; arc=none smtp.client-ip=209.85.128.202 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--danielmentz.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="gkS9Mz89" Received: by mail-yw1-f202.google.com with SMTP id 00721157ae682-61be4b79115so94974717b3.1 for ; Mon, 13 May 2024 14:54:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1715637278; x=1716242078; darn=lists.linux.dev; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=nLCfu/fqBdgUhwrBItdRpAkKl/eJY8dzIchUYWaFit4=; b=gkS9Mz89Me4IT1dmjNLFFx2RYJhvl4giTZrbD9Y6azY6i1nN1FnXbApkmBwhRmbIAH s80DN0ZBKndB8aHeJ/FWdt4c/XLIpMNOzofvX26ehOmvdFjDnOGum5m6vWIm1kthERqZ zAMyWJCE6Xf93MY7xvNVkEtkbh0ZGQfuwSTlg7wvs8IbdRVXlFfyZOVxst1ATBiX8r4Z KQY70jeG6wpgN10ZVzDOC41MtRStJNiUn/t+3prEQYoQ9+PUTDKp8WwPKkz7BslDMTBw 9Za7bJUGQC1k63019TRE+xdKb9MDDId4vMTlBC33URuxsDDxEst+NZVZkn3Ojsl5YwDQ Ugwg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1715637278; x=1716242078; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=nLCfu/fqBdgUhwrBItdRpAkKl/eJY8dzIchUYWaFit4=; b=V3PJvQ5j6Gp/XqHeAN9F0RXMcLuiXGYmBhfoYFt2rGgaarY/HewDDu0wnjoEmjs1HN 1ibrJcdIWuqBpThZtcfawnAL9qV399/H7M/hub36y9ME85Vsanah7PCs6KEV3zQCOOMs xO1mlXBgMynb/zVqdJa5UiWScKbKty/CMNvdou7UyyV8jnKJl7KAXfd+aC7EisU8qnOD w/vjhTuqTkuESQ76Ig/GhOuGIC4HBs9DRLp7mljqgeTX4x0g2rL3+ah5hTfljNBURpqF tuXlVFpLnd+LIhzfT6w2IDLGcD4YsjzQr3eLUWmBVX5XzEOPT+LnpR4CM34G3NJ0hVig DS1A== X-Gm-Message-State: AOJu0YyQIh+ZNNTpIGXkRoeYfnPxbtNsS48zzeZXzuXPKJz5GSyIavu2 kVvV+qmloglWYSgIrJJbvbl1GZ1zdzQe7qQa8vQ1QOwFnG3L8WEvw3LdAMoi4cRq6xTsFHd7nxy f+wPawJsayJKDT/xi92IoZCfCMknccdulmzRgfd4TZPjrvQTwsFAxpD4aDwd6HIWDRonV3GUxzN MZQKPh8ckxDJbn1tUVtUmgL1utxJ4zk2D6o+OUt4Rw/zzAWlNW11kmmCzcTg== X-Google-Smtp-Source: AGHT+IEzFQYlYFIgc/e9f7z4iewBzdLW8Aw+EWSr+VLf+czjs9zn80/GyVgkRdrc/WgprqJbLeW/K6zMmdrgWqpC3Q== X-Received: from danielmentz2.mtv.corp.google.com ([2620:15c:72:202:dff:1e7e:4b2a:dbc6]) (user=danielmentz job=sendgmr) by 2002:a05:6902:102d:b0:dee:6802:dc49 with SMTP id 3f1490d57ef6-dee6802f337mr1995744276.1.1715637278308; Mon, 13 May 2024 14:54:38 -0700 (PDT) Date: Mon, 13 May 2024 14:54:20 -0700 Precedence: bulk X-Mailing-List: iommu@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 X-Mailer: git-send-email 2.45.0.118.g7fe29c98d7-goog Message-ID: <20240513215420.408374-1-danielmentz@google.com> Subject: [PATCH] iommu/arm-smmu-v3: Skip prefetch cmd for MMU-600, MMU-700 From: Daniel Mentz To: iommu@lists.linux.dev Cc: Nicolin Chen , Robin Murphy , Daniel Mentz Content-Type: text/plain; charset="UTF-8" Arm CoreLink MMU-600 and MMU-700 both silently ignore the CMD_PREFETCH_CONFIG command. Let's not waste cycles adding this command to the command queue if it is ignored anyway. Signed-off-by: Daniel Mentz --- drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c index aa62f0ecd053..98f1c4b44ef3 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c @@ -3684,6 +3684,8 @@ static void arm_smmu_device_iidr_probe(struct arm_smmu_device *smmu) case IIDR_IMPLEMENTER_ARM: switch (productid) { case IIDR_PRODUCTID_ARM_MMU_600: + /* MMU-600 silently ignores CMD_PREFETCH_CONFIG */ + smmu->options |= ARM_SMMU_OPT_SKIP_PREFETCH; /* Arm erratum 1076982 */ if (variant == 0 && revision <= 2) smmu->features &= ~ARM_SMMU_FEAT_SEV; @@ -3692,6 +3694,8 @@ static void arm_smmu_device_iidr_probe(struct arm_smmu_device *smmu) smmu->features &= ~ARM_SMMU_FEAT_NESTING; break; case IIDR_PRODUCTID_ARM_MMU_700: + /* MMU-700 silently ignores CMD_PREFETCH_CONFIG */ + smmu->options |= ARM_SMMU_OPT_SKIP_PREFETCH; /* Arm erratum 2812531 */ smmu->features &= ~ARM_SMMU_FEAT_BTM; smmu->options |= ARM_SMMU_OPT_CMDQ_FORCE_SYNC; -- 2.45.0.118.g7fe29c98d7-goog