From patchwork Wed Jun 23 13:42:01 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sai Prakash Ranjan X-Patchwork-Id: 465947 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=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, 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 163F1C4743C for ; Wed, 23 Jun 2021 13:42:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EFC7C61026 for ; Wed, 23 Jun 2021 13:42:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230225AbhFWNom (ORCPT ); Wed, 23 Jun 2021 09:44:42 -0400 Received: from m43-7.mailgun.net ([69.72.43.7]:63761 "EHLO m43-7.mailgun.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230206AbhFWNom (ORCPT ); Wed, 23 Jun 2021 09:44:42 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1624455744; h=Content-Transfer-Encoding: MIME-Version: Message-Id: Date: Subject: Cc: To: From: Sender; bh=e19j/1XoyCNIaWhrPNV1lzM0QrlGIxcqH0ZQJMkma/E=; b=u4h9BKVePqNgrJ0Z7X9N4T//pjcKHdrBtTxRwQT2Guh1/yd9uyZjcSKrtYbiQEfy+qE2DUed Wy2y1eIkBae/anzpDq/UiC2ydDYvSjfHwkylvI8TO1la4BNpfWc4VFxD3lNkk4AnyAwIvYEh s2sh87bYq2XNLjtIczb1i8crAMo= X-Mailgun-Sending-Ip: 69.72.43.7 X-Mailgun-Sid: WyI1MzIzYiIsICJsaW51eC1hcm0tbXNtQHZnZXIua2VybmVsLm9yZyIsICJiZTllNGEiXQ== Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by smtp-out-n05.prod.us-east-1.postgun.com with SMTP id 60d33a40dc4628fe7e2af37e (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Wed, 23 Jun 2021 13:42:24 GMT Sender: saiprakash.ranjan=codeaurora.org@mg.codeaurora.org Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 5125FC43145; Wed, 23 Jun 2021 13:42:23 +0000 (UTC) Received: from blr-ubuntu-253.qualcomm.com (blr-bdr-fw-01_GlobalNAT_AllZones-Outside.qualcomm.com [103.229.18.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: saiprakash.ranjan) by smtp.codeaurora.org (Postfix) with ESMTPSA id 88443C43145; Wed, 23 Jun 2021 13:42:17 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 88443C43145 Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=fail smtp.mailfrom=saiprakash.ranjan@codeaurora.org From: Sai Prakash Ranjan To: Will Deacon , Robin Murphy , Joerg Roedel Cc: iommu@lists.linux-foundation.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, Doug Anderson , Krishna Reddy , Thierry Reding , Tomasz Figa , Bjorn Andersson , Sai Prakash Ranjan Subject: [PATCHv3] iommu/arm-smmu: Optimize ->tlb_flush_walk() for qcom implementation Date: Wed, 23 Jun 2021 19:12:01 +0530 Message-Id: <20210623134201.16140-1-saiprakash.ranjan@codeaurora.org> X-Mailer: git-send-email 2.29.0 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Currently for iommu_unmap() of large scatter-gather list with page size elements, the majority of time is spent in flushing of partial walks in __arm_lpae_unmap() which is a VA based TLB invalidation invalidating page-by-page on iommus like arm-smmu-v2 (TLBIVA). For example: to unmap a 32MB scatter-gather list with page size elements (8192 entries), there are 16->2MB buffer unmaps based on the pgsize (2MB for 4K granule) and each of 2MB will further result in 512 TLBIVAs (2MB/4K) resulting in a total of 8192 TLBIVAs (512*16) for 16->2MB causing a huge overhead. On qcom implementation, there are several performance improvements for TLB cache invalidations in HW like wait-for-safe (for realtime clients such as camera and display) and few others to allow for cache lookups/updates when TLBI is in progress for the same context bank. So the cost of over-invalidation is less compared to the unmap latency on several usecases like camera which deals with large buffers. So, ASID based TLB invalidations (TLBIASID) can be used to invalidate the entire context for partial walk flush thereby improving the unmap latency. Non-strict mode can use this by default for all platforms given its all about over-invalidation saving time on individual unmaps and non-deterministic generally. For this example of 32MB scatter-gather list unmap, this change results in just 16 ASID based TLB invalidations (TLBIASIDs) as opposed to 8192 TLBIVAs thereby increasing the performance of unmaps drastically. Test on QTI SM8150 SoC for 10 iterations of iommu_{map_sg}/unmap: (average over 10 iterations) Before this optimization: size iommu_map_sg iommu_unmap 4K 2.067 us 1.854 us 64K 9.598 us 8.802 us 1M 148.890 us 130.718 us 2M 305.864 us 67.291 us 12M 1793.604 us 390.838 us 16M 2386.848 us 518.187 us 24M 3563.296 us 775.989 us 32M 4747.171 us 1033.364 us After this optimization: size iommu_map_sg iommu_unmap 4K 1.723 us 1.765 us 64K 9.880 us 8.869 us 1M 155.364 us 135.223 us 2M 303.906 us 5.385 us 12M 1786.557 us 21.250 us 16M 2391.890 us 27.437 us 24M 3570.895 us 39.937 us 32M 4755.234 us 51.797 us This is further reduced once the map/unmap_pages() support gets in which will result in just 1 TLBIASID as compared to 16 TLBIASIDs. Real world data also shows big difference in unmap performance as below: There were reports of camera frame drops because of high overhead in iommu unmap without this optimization because of frequent unmaps issued by camera of about 100MB/s taking more than 100ms thereby causing frame drops. Signed-off-by: Sai Prakash Ranjan --- Changes in v3: * Move the logic to arm-smmu driver from io-pgtable (Robin) * Use a new set of iommu_flush_ops->arm_smmu_s1_tlb_impl_ops and use it for qcom impl Changes in v2: * Add a quirk to choose tlb_flush_all in partial walk flush * Set the quirk for QTI SoC implementation --- drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c | 13 +++++++++++++ drivers/iommu/arm/arm-smmu/arm-smmu.c | 17 ++++++++++++++++- 2 files changed, 29 insertions(+), 1 deletion(-) diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c index 7771d40176de..218c71465819 100644 --- a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c +++ b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c @@ -10,6 +10,8 @@ #include "arm-smmu.h" +extern const struct iommu_flush_ops arm_smmu_s1_tlb_impl_ops; + struct qcom_smmu { struct arm_smmu_device smmu; bool bypass_quirk; @@ -146,6 +148,8 @@ static int qcom_adreno_smmu_init_context(struct arm_smmu_domain *smmu_domain, { struct adreno_smmu_priv *priv; + pgtbl_cfg->tlb = &arm_smmu_s1_tlb_impl_ops; + /* Only enable split pagetables for the GPU device (SID 0) */ if (!qcom_adreno_smmu_is_gpu_device(dev)) return 0; @@ -185,6 +189,14 @@ static const struct of_device_id qcom_smmu_client_of_match[] __maybe_unused = { { } }; +static int qcom_smmu_init_context(struct arm_smmu_domain *smmu_domain, + struct io_pgtable_cfg *pgtbl_cfg, struct device *dev) +{ + pgtbl_cfg->tlb = &arm_smmu_s1_tlb_impl_ops; + + return 0; +} + static int qcom_smmu_cfg_probe(struct arm_smmu_device *smmu) { unsigned int last_s2cr = ARM_SMMU_GR0_S2CR(smmu->num_mapping_groups - 1); @@ -308,6 +320,7 @@ static int qcom_smmu500_reset(struct arm_smmu_device *smmu) } static const struct arm_smmu_impl qcom_smmu_impl = { + .init_context = qcom_smmu_init_context, .cfg_probe = qcom_smmu_cfg_probe, .def_domain_type = qcom_smmu_def_domain_type, .reset = qcom_smmu500_reset, diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.c b/drivers/iommu/arm/arm-smmu/arm-smmu.c index d3c6f54110a5..f3845e822565 100644 --- a/drivers/iommu/arm/arm-smmu/arm-smmu.c +++ b/drivers/iommu/arm/arm-smmu/arm-smmu.c @@ -341,6 +341,12 @@ static void arm_smmu_tlb_add_page_s1(struct iommu_iotlb_gather *gather, ARM_SMMU_CB_S1_TLBIVAL); } +static void arm_smmu_tlb_inv_walk_impl_s1(unsigned long iova, size_t size, + size_t granule, void *cookie) +{ + arm_smmu_tlb_inv_context_s1(cookie); +} + static void arm_smmu_tlb_inv_walk_s2(unsigned long iova, size_t size, size_t granule, void *cookie) { @@ -388,6 +394,12 @@ static const struct iommu_flush_ops arm_smmu_s1_tlb_ops = { .tlb_add_page = arm_smmu_tlb_add_page_s1, }; +const struct iommu_flush_ops arm_smmu_s1_tlb_impl_ops = { + .tlb_flush_all = arm_smmu_tlb_inv_context_s1, + .tlb_flush_walk = arm_smmu_tlb_inv_walk_impl_s1, + .tlb_add_page = arm_smmu_tlb_add_page_s1, +}; + static const struct iommu_flush_ops arm_smmu_s2_tlb_ops_v2 = { .tlb_flush_all = arm_smmu_tlb_inv_context_s2, .tlb_flush_walk = arm_smmu_tlb_inv_walk_s2, @@ -703,7 +715,10 @@ static int arm_smmu_init_domain_context(struct iommu_domain *domain, ias = min(ias, 32UL); oas = min(oas, 32UL); } - smmu_domain->flush_ops = &arm_smmu_s1_tlb_ops; + if (!iommu_get_dma_strict(domain)) + smmu_domain->flush_ops = &arm_smmu_s1_tlb_impl_ops; + else + smmu_domain->flush_ops = &arm_smmu_s1_tlb_ops; break; case ARM_SMMU_DOMAIN_NESTED: /*