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=-9.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 D0468C388F9 for ; Wed, 11 Nov 2020 06:40:59 +0000 (UTC) Received: from whitealder.osuosl.org (smtp1.osuosl.org [140.211.166.138]) (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 3AD1220795 for ; Wed, 11 Nov 2020 06:40:56 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=mg.codeaurora.org header.i=@mg.codeaurora.org header.b="mPabV0lH" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3AD1220795 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 localhost (localhost [127.0.0.1]) by whitealder.osuosl.org (Postfix) with ESMTP id AD3A28684A; Wed, 11 Nov 2020 06:40:56 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from whitealder.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id BhFUmqIRDyTP; Wed, 11 Nov 2020 06:40:56 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by whitealder.osuosl.org (Postfix) with ESMTP id 0CDEA86072; Wed, 11 Nov 2020 06:40:56 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id D4427C0889; Wed, 11 Nov 2020 06:40:55 +0000 (UTC) Received: from hemlock.osuosl.org (smtp2.osuosl.org [140.211.166.133]) by lists.linuxfoundation.org (Postfix) with ESMTP id 9E2D5C016F for ; Wed, 11 Nov 2020 06:40:54 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by hemlock.osuosl.org (Postfix) with ESMTP id 8C59D87394 for ; Wed, 11 Nov 2020 06:40:54 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from hemlock.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id rzcuwSdAzdDz for ; Wed, 11 Nov 2020 06:40:53 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from m42-4.mailgun.net (m42-4.mailgun.net [69.72.42.4]) by hemlock.osuosl.org (Postfix) with ESMTPS id 8B17C87393 for ; Wed, 11 Nov 2020 06:40:53 +0000 (UTC) DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1605076853; h=Message-ID: References: In-Reply-To: Subject: Cc: To: From: Date: Content-Transfer-Encoding: Content-Type: MIME-Version: Sender; bh=G5QF7G064HtJTosA44a0rDZ6QvsJzebmYGAGLkBClkA=; b=mPabV0lH9AOI6uXWYgABbea+cmtYQIGqMRO0OVUYUcPwiVoy8EM03Ua79v2Cg0hsX2VjSm+h JsgbgDeoUtqCgeuaXa2cVwRPnJO1lvgvi6Y4454btK7jBbZQxMd8xkehAXHyRNY8KXmdRSGK wjIS4jUvapb90fnBlW2f2VIXNLg= X-Mailgun-Sending-Ip: 69.72.42.4 X-Mailgun-Sid: WyI3NDkwMCIsICJpb21tdUBsaXN0cy5saW51eC1mb3VuZGF0aW9uLm9yZyIsICJiZTllNGEiXQ== Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by smtp-out-n07.prod.us-east-1.postgun.com with SMTP id 5fab877436968cecaf883e03 (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Wed, 11 Nov 2020 06:40:52 GMT Received: by smtp.codeaurora.org (Postfix, from userid 1001) id BF9B6C433FE; Wed, 11 Nov 2020 06:40:51 +0000 (UTC) Received: from mail.codeaurora.org (localhost.localdomain [127.0.0.1]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) (Authenticated sender: saiprakash.ranjan) by smtp.codeaurora.org (Postfix) with ESMTPSA id B0E68C433C8; Wed, 11 Nov 2020 06:40:50 +0000 (UTC) MIME-Version: 1.0 Date: Wed, 11 Nov 2020 12:10:50 +0530 From: Sai Prakash Ranjan To: Will Deacon Subject: Re: [PATCHv7 2/7] iommu/arm-smmu: Add domain attribute for system cache In-Reply-To: <20201110121835.GC16239@willie-the-truck> References: <20201110121835.GC16239@willie-the-truck> Message-ID: X-Sender: saiprakash.ranjan@codeaurora.org User-Agent: Roundcube Webmail/1.3.9 Cc: freedreno@lists.freedesktop.org, linux-arm-msm@vger.kernel.org, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, Akhil P Oommen , dri-devel@lists.freedesktop.org, "Kristian H . Kristensen" , Robin Murphy , linux-arm-kernel@lists.infradead.org X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On 2020-11-10 17:48, Will Deacon wrote: > On Fri, Oct 30, 2020 at 02:53:09PM +0530, Sai Prakash Ranjan wrote: >> Add iommu domain attribute for using system cache aka last level >> cache by client drivers like GPU to set right attributes for caching >> the hardware pagetables into the system cache. >> >> Signed-off-by: Sai Prakash Ranjan >> --- >> drivers/iommu/arm/arm-smmu/arm-smmu.c | 17 +++++++++++++++++ >> drivers/iommu/arm/arm-smmu/arm-smmu.h | 1 + >> include/linux/iommu.h | 1 + >> 3 files changed, 19 insertions(+) >> >> diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.c >> b/drivers/iommu/arm/arm-smmu/arm-smmu.c >> index b1cf8f0abc29..070d13f80c7e 100644 >> --- a/drivers/iommu/arm/arm-smmu/arm-smmu.c >> +++ b/drivers/iommu/arm/arm-smmu/arm-smmu.c >> @@ -789,6 +789,9 @@ static int arm_smmu_init_domain_context(struct >> iommu_domain *domain, >> if (smmu_domain->non_strict) >> pgtbl_cfg.quirks |= IO_PGTABLE_QUIRK_NON_STRICT; >> >> + if (smmu_domain->sys_cache) >> + pgtbl_cfg.quirks |= IO_PGTABLE_QUIRK_SYS_CACHE; >> + >> pgtbl_ops = alloc_io_pgtable_ops(fmt, &pgtbl_cfg, smmu_domain); >> if (!pgtbl_ops) { >> ret = -ENOMEM; >> @@ -1520,6 +1523,9 @@ static int arm_smmu_domain_get_attr(struct >> iommu_domain *domain, >> case DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE: >> *(int *)data = smmu_domain->non_strict; >> return 0; >> + case DOMAIN_ATTR_SYS_CACHE: >> + *((int *)data) = smmu_domain->sys_cache; >> + return 0; >> default: >> return -ENODEV; >> } >> @@ -1551,6 +1557,17 @@ static int arm_smmu_domain_set_attr(struct >> iommu_domain *domain, >> else >> smmu_domain->stage = ARM_SMMU_DOMAIN_S1; >> break; >> + case DOMAIN_ATTR_SYS_CACHE: >> + if (smmu_domain->smmu) { >> + ret = -EPERM; >> + goto out_unlock; >> + } >> + >> + if (*((int *)data)) >> + smmu_domain->sys_cache = true; >> + else >> + smmu_domain->sys_cache = false; >> + break; >> default: >> ret = -ENODEV; >> } >> diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.h >> b/drivers/iommu/arm/arm-smmu/arm-smmu.h >> index 885840f3bec8..dfc44d806671 100644 >> --- a/drivers/iommu/arm/arm-smmu/arm-smmu.h >> +++ b/drivers/iommu/arm/arm-smmu/arm-smmu.h >> @@ -373,6 +373,7 @@ struct arm_smmu_domain { >> struct mutex init_mutex; /* Protects smmu pointer */ >> spinlock_t cb_lock; /* Serialises ATS1* ops and TLB syncs */ >> struct iommu_domain domain; >> + bool sys_cache; >> }; >> >> struct arm_smmu_master_cfg { >> diff --git a/include/linux/iommu.h b/include/linux/iommu.h >> index b95a6f8db6ff..4f4bb9c6f8f6 100644 >> --- a/include/linux/iommu.h >> +++ b/include/linux/iommu.h >> @@ -118,6 +118,7 @@ enum iommu_attr { >> DOMAIN_ATTR_FSL_PAMUV1, >> DOMAIN_ATTR_NESTING, /* two stages of translation */ >> DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE, >> + DOMAIN_ATTR_SYS_CACHE, > > I think you're trying to make this look generic, but it's really not. > If we need to funnel io-pgtable quirks through domain attributes, then > I > think we should be open about that and add something like > DOMAIN_ATTR_IO_PGTABLE_CFG which could take a struct of page-table > configuration data for the domain (this could just be quirks initially, > but maybe it's worth extending to take ias, oas and page size) > Actually the initial versions used DOMAIN_ATTR_QCOM_SYS_CACHE to make it QCOM specific and not generic, I don't see anyone else using this attribute, would that work? Thanks, Sai -- QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu