From mboxrd@z Thu Jan 1 00:00:00 1970 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=-8.8 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 312D1C04AB4 for ; Tue, 21 May 2019 16:14:30 +0000 (UTC) Received: from mail.linuxfoundation.org (mail.linuxfoundation.org [140.211.169.12]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 05A7B217F4 for ; Tue, 21 May 2019 16:14:30 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="key not found in DNS" (0-bit key) header.d=codeaurora.org header.i=@codeaurora.org header.b="P67f9DuV"; dkim=fail reason="key not found in DNS" (0-bit key) header.d=codeaurora.org header.i=@codeaurora.org header.b="XbU4KG7B" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 05A7B217F4 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from mail.linux-foundation.org (localhost [127.0.0.1]) by mail.linuxfoundation.org (Postfix) with ESMTP id A86E6C4E; Tue, 21 May 2019 16:14:24 +0000 (UTC) Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id AEA3C255 for ; Tue, 21 May 2019 16:14:23 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from smtp.codeaurora.org (smtp.codeaurora.org [198.145.29.96]) by smtp1.linuxfoundation.org (Postfix) with ESMTPS id 3C1E5E3 for ; Tue, 21 May 2019 16:14:23 +0000 (UTC) Received: by smtp.codeaurora.org (Postfix, from userid 1000) id C88A360ACA; Tue, 21 May 2019 16:14:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1558455262; bh=aGKLQAv1Wqo3iK9as+fTnW2wvo10dYipLbiZ+tTw6Qw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=P67f9DuVuSI/OYxypF+ICnm2C4cvfpQN0sAcO368lOjJALeooaTKx7vix8hs+NMmH scqlRcZ5+urgTrih933Hs5for5q3k70VLEZlxbdsgNfwMzCVxwHV+dpGIL4dPCmMP6 g08u4a7QzUexzIOIruXZtQl92UAnMFgB8jHqGwD0= Received: from jcrouse1-lnx.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: jcrouse@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id E5A3D60DB6; Tue, 21 May 2019 16:14:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1558455252; bh=aGKLQAv1Wqo3iK9as+fTnW2wvo10dYipLbiZ+tTw6Qw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=XbU4KG7BYVeqP+pX8713MzxW2ReuMEqPxBK8OCaomYnCqk8nnntMi+KsdEGJmYd5g dsnmVx8AfWokWZKPswurOQCdDIMEfd/ixPvupQlqrlcnErZFxfEY7224yQWRsaXXcN CbzeGwNUrHrmrp5uZJc7OAE1Wn8ubV85ZOddO/Cw= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org E5A3D60DB6 Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=jcrouse@codeaurora.org From: Jordan Crouse To: freedreno@lists.freedesktop.org Subject: [PATCH v2 01/15] iommu/arm-smmu: Allow IOMMU enabled devices to skip DMA domains Date: Tue, 21 May 2019 10:13:49 -0600 Message-Id: <1558455243-32746-2-git-send-email-jcrouse@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1558455243-32746-1-git-send-email-jcrouse@codeaurora.org> References: <1558455243-32746-1-git-send-email-jcrouse@codeaurora.org> Cc: jean-philippe.brucker@arm.com, linux-arm-msm@vger.kernel.org, Will Deacon , dianders@chromium.org, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, hoegsberg@google.com, Robin Murphy , linux-arm-kernel@lists.infradead.org X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: iommu-bounces@lists.linux-foundation.org Errors-To: iommu-bounces@lists.linux-foundation.org Allow IOMMU enabled devices specified on an opt-in list to create a default identity domain for a new IOMMU group and bypass the DMA domain created by the IOMMU core. This allows the group to be properly set up but otherwise skips touching the hardware until the client device attaches a unmanaged domain of its own. Signed-off-by: Jordan Crouse --- drivers/iommu/arm-smmu.c | 42 ++++++++++++++++++++++++++++++++++++++++++ drivers/iommu/iommu.c | 29 +++++++++++++++++++++++------ include/linux/iommu.h | 3 +++ 3 files changed, 68 insertions(+), 6 deletions(-) diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c index 5e54cc0..a795ada 100644 --- a/drivers/iommu/arm-smmu.c +++ b/drivers/iommu/arm-smmu.c @@ -1235,6 +1235,35 @@ static int arm_smmu_domain_add_master(struct arm_smmu_domain *smmu_domain, return 0; } +struct arm_smmu_client_match_data { + bool use_identity_domain; +}; + +static const struct arm_smmu_client_match_data qcom_adreno = { + .use_identity_domain = true, +}; + +static const struct arm_smmu_client_match_data qcom_mdss = { + .use_identity_domain = true, +}; + +static const struct of_device_id arm_smmu_client_of_match[] = { + { .compatible = "qcom,adreno", .data = &qcom_adreno }, + { .compatible = "qcom,mdp4", .data = &qcom_mdss }, + { .compatible = "qcom,mdss", .data = &qcom_mdss }, + { .compatible = "qcom,sdm845-mdss", .data = &qcom_mdss }, + {}, +}; + +static const struct arm_smmu_client_match_data * +arm_smmu_client_data(struct device *dev) +{ + const struct of_device_id *match = + of_match_device(arm_smmu_client_of_match, dev); + + return match ? match->data : NULL; +} + static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev) { int ret; @@ -1552,6 +1581,7 @@ static struct iommu_group *arm_smmu_device_group(struct device *dev) { struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); struct arm_smmu_device *smmu = fwspec_smmu(fwspec); + const struct arm_smmu_client_match_data *client; struct iommu_group *group = NULL; int i, idx; @@ -1573,6 +1603,18 @@ static struct iommu_group *arm_smmu_device_group(struct device *dev) else group = generic_device_group(dev); + client = arm_smmu_client_data(dev); + + /* + * If the client chooses to bypass the dma domain, create a identity + * domain as a default placeholder. This will give the device a + * default domain but skip DMA operations and not consume a context + * bank + */ + if (client && client->no_dma_domain) + iommu_group_set_default_domain(group, dev, + IOMMU_DOMAIN_IDENTITY); + return group; } diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 67ee662..af3e1ed 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -1062,6 +1062,24 @@ struct iommu_group *fsl_mc_device_group(struct device *dev) return group; } +struct iommu_domain *iommu_group_set_default_domain(struct iommu_group *group, + struct device *dev, unsigned int type) +{ + struct iommu_domain *dom; + + dom = __iommu_domain_alloc(dev->bus, type); + if (!dom) + return NULL; + + /* FIXME: Error if the default domain is already set? */ + group->default_domain = dom; + if (!group->domain) + group->domain = dom; + + return dom; +} +EXPORT_SYMBOL_GPL(iommu_group_set_default_domain); + /** * iommu_group_get_for_dev - Find or create the IOMMU group for a device * @dev: target device @@ -1099,9 +1117,12 @@ struct iommu_group *iommu_group_get_for_dev(struct device *dev) if (!group->default_domain) { struct iommu_domain *dom; - dom = __iommu_domain_alloc(dev->bus, iommu_def_domain_type); + dom = iommu_group_set_default_domain(group, dev, + iommu_def_domain_type); + if (!dom && iommu_def_domain_type != IOMMU_DOMAIN_DMA) { - dom = __iommu_domain_alloc(dev->bus, IOMMU_DOMAIN_DMA); + dom = iommu_group_set_default_domain(group, dev, + IOMMU_DOMAIN_DMA); if (dom) { dev_warn(dev, "failed to allocate default IOMMU domain of type %u; falling back to IOMMU_DOMAIN_DMA", @@ -1109,10 +1130,6 @@ struct iommu_group *iommu_group_get_for_dev(struct device *dev) } } - group->default_domain = dom; - if (!group->domain) - group->domain = dom; - if (dom && !iommu_dma_strict) { int attr = 1; iommu_domain_set_attr(dom, diff --git a/include/linux/iommu.h b/include/linux/iommu.h index a815cf6..4ef8bd5 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -394,6 +394,9 @@ extern int iommu_group_id(struct iommu_group *group); extern struct iommu_group *iommu_group_get_for_dev(struct device *dev); extern struct iommu_domain *iommu_group_default_domain(struct iommu_group *); +struct iommu_domain *iommu_group_set_default_domain(struct iommu_group *group, + struct device *dev, unsigned int type); + extern int iommu_domain_get_attr(struct iommu_domain *domain, enum iommu_attr, void *data); extern int iommu_domain_set_attr(struct iommu_domain *domain, enum iommu_attr, -- 2.7.4 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu