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=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 802BDC43218 for ; Mon, 10 Jun 2019 18:52:06 +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 6513520820 for ; Mon, 10 Jun 2019 18:52:06 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6513520820 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com 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 B3537DC3; Mon, 10 Jun 2019 18:51:57 +0000 (UTC) Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id 74517DC2 for ; Mon, 10 Jun 2019 18:51:54 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp1.linuxfoundation.org (Postfix) with ESMTP id 16E9B6D6 for ; Mon, 10 Jun 2019 18:51:54 +0000 (UTC) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id BDCD0C0A; Mon, 10 Jun 2019 11:51:53 -0700 (PDT) Received: from ostrya.cambridge.arm.com (ostrya.cambridge.arm.com [10.1.196.129]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 4E5233F246; Mon, 10 Jun 2019 11:51:52 -0700 (PDT) From: Jean-Philippe Brucker To: will.deacon@arm.com Subject: [PATCH 3/8] iommu/arm-smmu-v3: Support platform SSID Date: Mon, 10 Jun 2019 19:47:09 +0100 Message-Id: <20190610184714.6786-4-jean-philippe.brucker@arm.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190610184714.6786-1-jean-philippe.brucker@arm.com> References: <20190610184714.6786-1-jean-philippe.brucker@arm.com> MIME-Version: 1.0 Cc: mark.rutland@arm.com, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, robh+dt@kernel.org, robin.murphy@arm.com, 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: , 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 For platform devices that support SubstreamID (SSID), firmware provides the number of supported SSID bits. Restrict it to what the SMMU supports and cache it into master->ssid_bits. Signed-off-by: Jean-Philippe Brucker --- drivers/iommu/arm-smmu-v3.c | 11 +++++++++++ drivers/iommu/of_iommu.c | 6 +++++- include/linux/iommu.h | 1 + 3 files changed, 17 insertions(+), 1 deletion(-) diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c index 4d5a694f02c2..3254f473e681 100644 --- a/drivers/iommu/arm-smmu-v3.c +++ b/drivers/iommu/arm-smmu-v3.c @@ -604,6 +604,7 @@ struct arm_smmu_master { struct list_head domain_head; u32 *sids; unsigned int num_sids; + unsigned int ssid_bits; bool ats_enabled :1; }; @@ -2097,6 +2098,16 @@ static int arm_smmu_add_device(struct device *dev) } } + master->ssid_bits = min(smmu->ssid_bits, fwspec->num_pasid_bits); + + /* + * If the SMMU doesn't support 2-stage CD, limit the linear + * tables to a reasonable number of contexts, let's say + * 64kB / sizeof(ctx_desc) = 1024 = 2^10 + */ + if (!(smmu->features & ARM_SMMU_FEAT_2_LVL_CDTAB)) + master->ssid_bits = min(master->ssid_bits, 10U); + group = iommu_group_get_for_dev(dev); if (!IS_ERR(group)) { iommu_group_put(group); diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c index f04a6df65eb8..04f4f6b95d82 100644 --- a/drivers/iommu/of_iommu.c +++ b/drivers/iommu/of_iommu.c @@ -206,8 +206,12 @@ const struct iommu_ops *of_iommu_configure(struct device *dev, if (err) break; } - } + fwspec = dev_iommu_fwspec_get(dev); + if (!err && fwspec) + of_property_read_u32(master_np, "pasid-num-bits", + &fwspec->num_pasid_bits); + } /* * Two success conditions can be represented by non-negative err here: diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 519e40fb23ce..b91df613385f 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -536,6 +536,7 @@ struct iommu_fwspec { struct fwnode_handle *iommu_fwnode; void *iommu_priv; u32 flags; + u32 num_pasid_bits; unsigned int num_ids; u32 ids[1]; }; -- 2.21.0 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu