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=-9.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 21ECCC7618F for ; Tue, 16 Jul 2019 17:51:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D8A6C2173C for ; Tue, 16 Jul 2019 17:51:39 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="hE+P9H/t" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388333AbfGPRvi (ORCPT ); Tue, 16 Jul 2019 13:51:38 -0400 Received: from mail-pl1-f196.google.com ([209.85.214.196]:39012 "EHLO mail-pl1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728366AbfGPRvi (ORCPT ); Tue, 16 Jul 2019 13:51:38 -0400 Received: by mail-pl1-f196.google.com with SMTP id b7so10497785pls.6 for ; Tue, 16 Jul 2019 10:51:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=UiLaRqQi+KN5P/cP6egPb78oRpeEozQB/t5Ad8Uztd4=; b=hE+P9H/tFUK8qpoBOYsg1V+ORebpPk0bjpfOrC11X3dwjJrq2UGU4kOsytw14cbTLr wOCN+LCKewt/JS2Z7zT+JsuLCfkk4iUXQE8zLGFD5oXwY1X2j/uwAXBu3t6Q4Bnvn1Wx vFmYwvPOkVkNb6SrLMRO9kIvJjMAHedXhrxRwMH2aOEKlBKWbDH52oySlExA8sO0L5qN Z3Y5nlT3eMF64tjLSabZV4HyjvDWAdJhcAkwUJkcqINqNFuuzyiWRzNwT8mlUVt6FN25 WCb2Gw3g9txNOZzeaUw2/X1747vo9vF+zVUp2X9B2xpJwRDDKucIlInL8yT74rg4dCQj Rqng== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=UiLaRqQi+KN5P/cP6egPb78oRpeEozQB/t5Ad8Uztd4=; b=D2N0xyuaxgn3UXsB8OtarC5kaC7rtk72bBEkG+BW3k2NMCvs204gjqKMoW/nUzWMct R9HIWfXUYslSaC0TcgNG2ob2HsowxT8CV2vhc/ttFuXBllJo9exs23LSLPacToBsircv pXXIXTCa/OyCJAA/btnNgy/Xc0YSWfUTJ6Ejhni30yAzCn9I7+m/ECc6CD2Ai5iI2wei uSdCrkxIMRqGJyiJamFfOw1Jwt03cBLh4AfdHbWMzSqTxJbzf17Xk26TThujxeS7Ke0N Ritxbqh2YEFq/mn+SCvlZ+QU36KNjTOry6gleHpmLEfNgwsqF7qtHLMN3dca+5lQ7ghQ huCw== X-Gm-Message-State: APjAAAWM9jE+s1GU14o00azdQx86JPvU4H0Sizyp1V0iPC6HQfjGa310 sFiDX2VlS1+I1B0k8wKpHLE= X-Google-Smtp-Source: APXvYqzFKslRA486uFuMA8KNQnLtCFo8RE9hfK9nYj7zlrGlay5yFSTuwTPyyWNjseq42zgOr7Agbw== X-Received: by 2002:a17:902:b20c:: with SMTP id t12mr37712885plr.285.1563299497373; Tue, 16 Jul 2019 10:51:37 -0700 (PDT) Received: from localhost ([100.118.89.203]) by smtp.gmail.com with ESMTPSA id g8sm2243238pgk.1.2019.07.16.10.51.36 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Tue, 16 Jul 2019 10:51:36 -0700 (PDT) From: Rob Clark To: dri-devel@lists.freedesktop.org Cc: Chris Wilson , Intel Graphics Development , Rob Clark , David Airlie , Daniel Vetter , Emil Velikov , Deepak Sharma , Imre Deak , Thomas Zimmermann , Eric Biggers , linux-kernel@vger.kernel.org Subject: [PATCH v2 3/3] drm/vgem: use normal cached mmap'ings Date: Tue, 16 Jul 2019 10:43:23 -0700 Message-Id: <20190716174331.7371-3-robdclark@gmail.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190716174331.7371-1-robdclark@gmail.com> References: <20190716174331.7371-1-robdclark@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Rob Clark Since there is no real device associated with VGEM, it is impossible to end up with appropriate dev->dma_ops, meaning that we have no way to invalidate the shmem pages allocated by VGEM. So, at least on platforms without drm_cflush_pages(), we end up with corruption when cache lines from previous usage of VGEM bo pages get evicted to memory. The only sane option is to use cached mappings. Signed-off-by: Rob Clark --- drivers/gpu/drm/vgem/vgem_drv.c | 24 ++++++++++++++---------- 1 file changed, 14 insertions(+), 10 deletions(-) diff --git a/drivers/gpu/drm/vgem/vgem_drv.c b/drivers/gpu/drm/vgem/vgem_drv.c index a179e962b79e..b6071a466b92 100644 --- a/drivers/gpu/drm/vgem/vgem_drv.c +++ b/drivers/gpu/drm/vgem/vgem_drv.c @@ -259,9 +259,6 @@ static int vgem_mmap(struct file *filp, struct vm_area_struct *vma) if (ret) return ret; - /* Keep the WC mmaping set by drm_gem_mmap() but our pages - * are ordinary and not special. - */ vma->vm_flags = flags | VM_DONTEXPAND | VM_DONTDUMP; return 0; } @@ -310,17 +307,17 @@ static void vgem_unpin_pages(struct drm_vgem_gem_object *bo) static int vgem_prime_pin(struct drm_gem_object *obj, struct device *dev) { struct drm_vgem_gem_object *bo = to_vgem_bo(obj); - long n_pages = obj->size >> PAGE_SHIFT; + long i, n_pages = obj->size >> PAGE_SHIFT; struct page **pages; pages = vgem_pin_pages(bo); if (IS_ERR(pages)) return PTR_ERR(pages); - /* Flush the object from the CPU cache so that importers can rely - * on coherent indirect access via the exported dma-address. - */ - drm_clflush_pages(pages, n_pages); + for (i = 0; i < n_pages; i++) { + dma_sync_single_for_device(dev, page_to_phys(pages[i]), + PAGE_SIZE, DMA_BIDIRECTIONAL); + } return 0; } @@ -328,6 +325,13 @@ static int vgem_prime_pin(struct drm_gem_object *obj, struct device *dev) static void vgem_prime_unpin(struct drm_gem_object *obj, struct device *dev) { struct drm_vgem_gem_object *bo = to_vgem_bo(obj); + long i, n_pages = obj->size >> PAGE_SHIFT; + struct page **pages = bo->pages; + + for (i = 0; i < n_pages; i++) { + dma_sync_single_for_cpu(dev, page_to_phys(pages[i]), + PAGE_SIZE, DMA_BIDIRECTIONAL); + } vgem_unpin_pages(bo); } @@ -382,7 +386,7 @@ static void *vgem_prime_vmap(struct drm_gem_object *obj) if (IS_ERR(pages)) return NULL; - return vmap(pages, n_pages, 0, pgprot_writecombine(PAGE_KERNEL)); + return vmap(pages, n_pages, 0, PAGE_KERNEL); } static void vgem_prime_vunmap(struct drm_gem_object *obj, void *vaddr) @@ -411,7 +415,7 @@ static int vgem_prime_mmap(struct drm_gem_object *obj, fput(vma->vm_file); vma->vm_file = get_file(obj->filp); vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; - vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags)); + vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); return 0; } -- 2.21.0