From patchwork Fri Feb 5 14:06:37 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 377551 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=-19.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, 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 9A6D7C4332B for ; Fri, 5 Feb 2021 22:12:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 65B4964EE4 for ; Fri, 5 Feb 2021 22:12:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232785AbhBEWMM (ORCPT ); Fri, 5 Feb 2021 17:12:12 -0500 Received: from mail.kernel.org ([198.145.29.99]:43228 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232718AbhBEOld (ORCPT ); Fri, 5 Feb 2021 09:41:33 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id D606464FD0; Fri, 5 Feb 2021 14:09:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1612534160; bh=ePV3E3Q2N8Cym8wCMus8yYv56jQDOqHPC0gGL7Ap4to=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=O4l+R8/m3O05FxM20NaY8kxuzzJyhF0tN1PAGm0PSs0YhDnGtTYM2mzycEoYFMwLH HeTFZVhcJzg9bThqqsDsctHDgGnEd4f7sR2HsuCE+22rxBqBKA37VRj3Y3sUEzLAIo du70f5LxmXs4B3/zfyTDVILj10oauoR3jTrb88Jc= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Robin Murphy , Neil Armstrong , Steven Price Subject: [PATCH 5.10 11/57] drm/panfrost: Support cache-coherent integrations Date: Fri, 5 Feb 2021 15:06:37 +0100 Message-Id: <20210205140656.464052816@linuxfoundation.org> X-Mailer: git-send-email 2.30.0 In-Reply-To: <20210205140655.982616732@linuxfoundation.org> References: <20210205140655.982616732@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Robin Murphy commit 268af50f38b1f2199a2e85e38073d7a25c20190c upstream. When the GPU's ACE-Lite interface is fully wired up and capable of snooping CPU caches, it may be described as "dma-coherent" in devicetree, which will already inform the DMA layer not to perform unnecessary cache maintenance. However, we still need to ensure that the GPU uses the appropriate cacheable outer-shareable attributes in order to generate the requisite snoop signals, and that CPU mappings don't create a mismatch by using a non-cacheable type either. Signed-off-by: Robin Murphy Tested-by: Neil Armstrong Reviewed-by: Steven Price Signed-off-by: Neil Armstrong Link: https://patchwork.freedesktop.org/patch/msgid/7024ce18c1cb1a226e918037d49175571db0b436.1600780574.git.robin.murphy@arm.com Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/panfrost/panfrost_device.h | 1 + drivers/gpu/drm/panfrost/panfrost_drv.c | 2 ++ drivers/gpu/drm/panfrost/panfrost_gem.c | 2 ++ drivers/gpu/drm/panfrost/panfrost_mmu.c | 1 + 4 files changed, 6 insertions(+) --- a/drivers/gpu/drm/panfrost/panfrost_device.h +++ b/drivers/gpu/drm/panfrost/panfrost_device.h @@ -88,6 +88,7 @@ struct panfrost_device { /* pm_domains for devices with more than one. */ struct device *pm_domain_devs[MAX_PM_DOMAINS]; struct device_link *pm_domain_links[MAX_PM_DOMAINS]; + bool coherent; struct panfrost_features features; const struct panfrost_compatible *comp; --- a/drivers/gpu/drm/panfrost/panfrost_drv.c +++ b/drivers/gpu/drm/panfrost/panfrost_drv.c @@ -587,6 +587,8 @@ static int panfrost_probe(struct platfor if (!pfdev->comp) return -ENODEV; + pfdev->coherent = device_get_dma_attr(&pdev->dev) == DEV_DMA_COHERENT; + /* Allocate and initialze the DRM device. */ ddev = drm_dev_alloc(&panfrost_drm_driver, &pdev->dev); if (IS_ERR(ddev)) --- a/drivers/gpu/drm/panfrost/panfrost_gem.c +++ b/drivers/gpu/drm/panfrost/panfrost_gem.c @@ -218,6 +218,7 @@ static const struct drm_gem_object_funcs */ struct drm_gem_object *panfrost_gem_create_object(struct drm_device *dev, size_t size) { + struct panfrost_device *pfdev = dev->dev_private; struct panfrost_gem_object *obj; obj = kzalloc(sizeof(*obj), GFP_KERNEL); @@ -227,6 +228,7 @@ struct drm_gem_object *panfrost_gem_crea INIT_LIST_HEAD(&obj->mappings.list); mutex_init(&obj->mappings.lock); obj->base.base.funcs = &panfrost_gem_funcs; + obj->base.map_cached = pfdev->coherent; return &obj->base.base; } --- a/drivers/gpu/drm/panfrost/panfrost_mmu.c +++ b/drivers/gpu/drm/panfrost/panfrost_mmu.c @@ -371,6 +371,7 @@ int panfrost_mmu_pgtable_alloc(struct pa .pgsize_bitmap = SZ_4K | SZ_2M, .ias = FIELD_GET(0xff, pfdev->features.mmu_features), .oas = FIELD_GET(0xff00, pfdev->features.mmu_features), + .coherent_walk = pfdev->coherent, .tlb = &mmu_tlb_ops, .iommu_dev = pfdev->dev, };