From patchwork Tue Oct 27 22:34:05 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jordan Crouse X-Patchwork-Id: 11862031 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 57B2F92C for ; Tue, 27 Oct 2020 22:34:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3AE4222202 for ; Tue, 27 Oct 2020 22:34:25 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=mg.codeaurora.org header.i=@mg.codeaurora.org header.b="pt/uGLiZ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1832452AbgJ0WeY (ORCPT ); Tue, 27 Oct 2020 18:34:24 -0400 Received: from m42-4.mailgun.net ([69.72.42.4]:14979 "EHLO m42-4.mailgun.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1832446AbgJ0WeY (ORCPT ); Tue, 27 Oct 2020 18:34:24 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1603838062; h=Content-Transfer-Encoding: MIME-Version: References: In-Reply-To: Message-Id: Date: Subject: Cc: To: From: Sender; bh=ACXlUBv3MYxWJzcS0H+Piwy+CuE5+ohSeW8DwDiXv7A=; b=pt/uGLiZjOa7KPm75pV+6h/ZIkLKWVN/Y/ljWRFzO3AaXx89Y1WNSMKuJanohErELOh3t4EG TUuf662Cha2O0XscnPTFWmLXeXFibEZzErMuP9CI586aChcKwSgHMXcUYPFXGqX7mchY7ZiG jR5IhsAC0btlLsNdLBLwI0C05Cg= X-Mailgun-Sending-Ip: 69.72.42.4 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-n04.prod.us-west-2.postgun.com with SMTP id 5f98a06eda4f4647733e0f54 (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Tue, 27 Oct 2020 22:34:22 GMT Sender: jcrouse=codeaurora.org@mg.codeaurora.org Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 43164C4339C; Tue, 27 Oct 2020 22:34:21 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-caf-mail-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.9 required=2.0 tests=ALL_TRUSTED,BAYES_00,SPF_FAIL, URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from jordan-laptop.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: jcrouse) by smtp.codeaurora.org (Postfix) with ESMTPSA id 61E49C433FE; Tue, 27 Oct 2020 22:34:16 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 61E49C433FE 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=jcrouse@codeaurora.org From: Jordan Crouse To: linux-arm-msm@vger.kernel.org Cc: Rob Clark , Bjorn Andersson , Joerg Roedel , Krishna Reddy , Robin Murphy , Sai Prakash Ranjan , Sibi Sankar , Stephen Boyd , Vivek Gautam , Will Deacon , iommu@lists.linux-foundation.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v18 1/4] iommu/arm-smmu-qcom: Add implementation for the adreno GPU SMMU Date: Tue, 27 Oct 2020 16:34:05 -0600 Message-Id: <20201027223408.469893-2-jcrouse@codeaurora.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20201027223408.469893-1-jcrouse@codeaurora.org> References: <20201027223408.469893-1-jcrouse@codeaurora.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Add a special implementation for the SMMU attached to most Adreno GPU target triggered from the qcom,adreno-smmu compatible string. The new Adreno SMMU implementation will enable split pagetables (TTBR1) for the domain attached to the GPU device (SID 0) and hard code it context bank 0 so the GPU hardware can implement per-instance pagetables. Co-developed-by: Rob Clark Signed-off-by: Jordan Crouse Signed-off-by: Rob Clark Reviewed-by: Bjorn Andersson --- drivers/iommu/arm/arm-smmu/arm-smmu-impl.c | 3 + drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c | 151 ++++++++++++++++++++- drivers/iommu/arm/arm-smmu/arm-smmu.h | 1 + 3 files changed, 153 insertions(+), 2 deletions(-) diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-impl.c b/drivers/iommu/arm/arm-smmu/arm-smmu-impl.c index 88f17cc33023..d199b4bff15d 100644 --- a/drivers/iommu/arm/arm-smmu/arm-smmu-impl.c +++ b/drivers/iommu/arm/arm-smmu/arm-smmu-impl.c @@ -223,6 +223,9 @@ struct arm_smmu_device *arm_smmu_impl_init(struct arm_smmu_device *smmu) of_device_is_compatible(np, "qcom,sm8250-smmu-500")) return qcom_smmu_impl_init(smmu); + if (of_device_is_compatible(smmu->dev->of_node, "qcom,adreno-smmu")) + return qcom_adreno_smmu_impl_init(smmu); + if (of_device_is_compatible(np, "marvell,ap806-smmu-500")) smmu->impl = &mrvl_mmu500_impl; diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c index be4318044f96..1e942eed2dfc 100644 --- a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c +++ b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c @@ -3,6 +3,7 @@ * Copyright (c) 2019, The Linux Foundation. All rights reserved. */ +#include #include #include @@ -12,6 +13,134 @@ struct qcom_smmu { struct arm_smmu_device smmu; }; +#define QCOM_ADRENO_SMMU_GPU_SID 0 + +static bool qcom_adreno_smmu_is_gpu_device(struct device *dev) +{ + struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); + int i; + + /* + * The GPU will always use SID 0 so that is a handy way to uniquely + * identify it and configure it for per-instance pagetables + */ + for (i = 0; i < fwspec->num_ids; i++) { + u16 sid = FIELD_GET(ARM_SMMU_SMR_ID, fwspec->ids[i]); + + if (sid == QCOM_ADRENO_SMMU_GPU_SID) + return true; + } + + return false; +} + +static const struct io_pgtable_cfg *qcom_adreno_smmu_get_ttbr1_cfg( + const void *cookie) +{ + struct arm_smmu_domain *smmu_domain = (void *)cookie; + struct io_pgtable *pgtable = + io_pgtable_ops_to_pgtable(smmu_domain->pgtbl_ops); + return &pgtable->cfg; +} + +/* + * Local implementation to configure TTBR0 with the specified pagetable config. + * The GPU driver will call this to enable TTBR0 when per-instance pagetables + * are active + */ + +static int qcom_adreno_smmu_set_ttbr0_cfg(const void *cookie, + const struct io_pgtable_cfg *pgtbl_cfg) +{ + struct arm_smmu_domain *smmu_domain = (void *)cookie; + struct io_pgtable *pgtable = io_pgtable_ops_to_pgtable(smmu_domain->pgtbl_ops); + struct arm_smmu_cfg *cfg = &smmu_domain->cfg; + struct arm_smmu_cb *cb = &smmu_domain->smmu->cbs[cfg->cbndx]; + + /* The domain must have split pagetables already enabled */ + if (cb->tcr[0] & ARM_SMMU_TCR_EPD1) + return -EINVAL; + + /* If the pagetable config is NULL, disable TTBR0 */ + if (!pgtbl_cfg) { + /* Do nothing if it is already disabled */ + if ((cb->tcr[0] & ARM_SMMU_TCR_EPD0)) + return -EINVAL; + + /* Set TCR to the original configuration */ + cb->tcr[0] = arm_smmu_lpae_tcr(&pgtable->cfg); + cb->ttbr[0] = FIELD_PREP(ARM_SMMU_TTBRn_ASID, cb->cfg->asid); + } else { + u32 tcr = cb->tcr[0]; + + /* Don't call this again if TTBR0 is already enabled */ + if (!(cb->tcr[0] & ARM_SMMU_TCR_EPD0)) + return -EINVAL; + + tcr |= arm_smmu_lpae_tcr(pgtbl_cfg); + tcr &= ~(ARM_SMMU_TCR_EPD0 | ARM_SMMU_TCR_EPD1); + + cb->tcr[0] = tcr; + cb->ttbr[0] = pgtbl_cfg->arm_lpae_s1_cfg.ttbr; + cb->ttbr[0] |= FIELD_PREP(ARM_SMMU_TTBRn_ASID, cb->cfg->asid); + } + + arm_smmu_write_context_bank(smmu_domain->smmu, cb->cfg->cbndx); + + return 0; +} + +static int qcom_adreno_smmu_alloc_context_bank(struct arm_smmu_domain *smmu_domain, + struct arm_smmu_device *smmu, + struct device *dev, int start) +{ + int count; + + /* + * Assign context bank 0 to the GPU device so the GPU hardware can + * switch pagetables + */ + if (qcom_adreno_smmu_is_gpu_device(dev)) { + start = 0; + count = 1; + } else { + start = 1; + count = smmu->num_context_banks; + } + + return __arm_smmu_alloc_bitmap(smmu->context_map, start, count); +} + +static int qcom_adreno_smmu_init_context(struct arm_smmu_domain *smmu_domain, + struct io_pgtable_cfg *pgtbl_cfg, struct device *dev) +{ + struct adreno_smmu_priv *priv; + + /* Only enable split pagetables for the GPU device (SID 0) */ + if (!qcom_adreno_smmu_is_gpu_device(dev)) + return 0; + + /* + * All targets that use the qcom,adreno-smmu compatible string *should* + * be AARCH64 stage 1 but double check because the arm-smmu code assumes + * that is the case when the TTBR1 quirk is enabled + */ + if ((smmu_domain->stage == ARM_SMMU_DOMAIN_S1) && + (smmu_domain->cfg.fmt == ARM_SMMU_CTX_FMT_AARCH64)) + pgtbl_cfg->quirks |= IO_PGTABLE_QUIRK_ARM_TTBR1; + + /* + * Initialize private interface with GPU: + */ + + priv = dev_get_drvdata(dev); + priv->cookie = smmu_domain; + priv->get_ttbr1_cfg = qcom_adreno_smmu_get_ttbr1_cfg; + priv->set_ttbr0_cfg = qcom_adreno_smmu_set_ttbr0_cfg; + + return 0; +} + static const struct of_device_id qcom_smmu_client_of_match[] __maybe_unused = { { .compatible = "qcom,adreno" }, { .compatible = "qcom,mdp4" }, @@ -65,7 +194,15 @@ static const struct arm_smmu_impl qcom_smmu_impl = { .reset = qcom_smmu500_reset, }; -struct arm_smmu_device *qcom_smmu_impl_init(struct arm_smmu_device *smmu) +static const struct arm_smmu_impl qcom_adreno_smmu_impl = { + .init_context = qcom_adreno_smmu_init_context, + .def_domain_type = qcom_smmu_def_domain_type, + .reset = qcom_smmu500_reset, + .alloc_context_bank = qcom_adreno_smmu_alloc_context_bank, +}; + +static struct arm_smmu_device *qcom_smmu_create(struct arm_smmu_device *smmu, + const struct arm_smmu_impl *impl) { struct qcom_smmu *qsmmu; @@ -75,8 +212,18 @@ struct arm_smmu_device *qcom_smmu_impl_init(struct arm_smmu_device *smmu) qsmmu->smmu = *smmu; - qsmmu->smmu.impl = &qcom_smmu_impl; + qsmmu->smmu.impl = impl; devm_kfree(smmu->dev, smmu); return &qsmmu->smmu; } + +struct arm_smmu_device *qcom_smmu_impl_init(struct arm_smmu_device *smmu) +{ + return qcom_smmu_create(smmu, &qcom_smmu_impl); +} + +struct arm_smmu_device *qcom_adreno_smmu_impl_init(struct arm_smmu_device *smmu) +{ + return qcom_smmu_create(smmu, &qcom_adreno_smmu_impl); +} diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.h b/drivers/iommu/arm/arm-smmu/arm-smmu.h index 1a746476927c..6c5ff9999eae 100644 --- a/drivers/iommu/arm/arm-smmu/arm-smmu.h +++ b/drivers/iommu/arm/arm-smmu/arm-smmu.h @@ -520,6 +520,7 @@ static inline void arm_smmu_writeq(struct arm_smmu_device *smmu, int page, struct arm_smmu_device *arm_smmu_impl_init(struct arm_smmu_device *smmu); struct arm_smmu_device *nvidia_smmu_impl_init(struct arm_smmu_device *smmu); struct arm_smmu_device *qcom_smmu_impl_init(struct arm_smmu_device *smmu); +struct arm_smmu_device *qcom_adreno_smmu_impl_init(struct arm_smmu_device *smmu); void arm_smmu_write_context_bank(struct arm_smmu_device *smmu, int idx); int arm_mmu500_reset(struct arm_smmu_device *smmu);