From patchwork Tue Nov 3 09:27:43 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 11876869 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=-6.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no 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 7032EC83011 for ; Tue, 3 Nov 2020 10:34:13 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (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 12A6722464 for ; Tue, 3 Nov 2020 10:34:13 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="BWJY7YL9"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="W6vWFt0H" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 12A6722464 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linutronix.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=intel-gfx-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 8B54C6EC65; Tue, 3 Nov 2020 10:34:12 +0000 (UTC) Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) by gabe.freedesktop.org (Postfix) with ESMTPS id B2E7D6EC7E; Tue, 3 Nov 2020 10:34:10 +0000 (UTC) Message-Id: <20201103095859.726187546@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1604399641; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: references:references; bh=r3bRNSPyDxqBB2q1RmPpZiq/s1h+pWiITk0Gb+X4YiE=; b=BWJY7YL9koWIqQGO6oJX8GMg2970+m6CUIohd/XJevMmQ80PB19bJDJ6iS8RO72tFyrU5a zermc/VLuhpDSGwb6AlQ+XUnPAk/ooP0r2CdnCXy7SbeJDAVykp+GhIB7O+PeOHtxIB/kQ kGAzLI/8Albxroia7VjhmBhPwLPYvYm7buHcNBklvKblOslUE8GFJQxCNSKNTUzn67UA6c dCL9UHwiUeuSbb9mKfvGa5CyJx9FEPWWAQv536xf3Kv7je840+HegrNr76dqY6DZp1xmcI hfpxU76xevyfk1dRUoZcIUQ3vKAJLr6y/fVXGv/9UWFE20X3bXjqdNO7IqY7sQ== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1604399641; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: references:references; bh=r3bRNSPyDxqBB2q1RmPpZiq/s1h+pWiITk0Gb+X4YiE=; b=W6vWFt0HyJmTC8mcOcU1LotSVA5E0cTby+uitrXhlUWJjwzfnwYugo9E0ZaVshQFT42zsP ckJmRhJkQSF0aCCw== Date: Tue, 03 Nov 2020 10:27:43 +0100 From: Thomas Gleixner To: LKML References: <20201103092712.714480842@linutronix.de> MIME-Version: 1.0 Subject: [Intel-gfx] [patch V3 31/37] drm/ttm: Replace kmap_atomic() usage X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Juri Lelli , linux-aio@kvack.org, Peter Zijlstra , Benjamin Herrenschmidt , Sebastian Andrzej Siewior , dri-devel@lists.freedesktop.org, virtualization@lists.linux-foundation.org, Ben Segall , linux-mm@kvack.org, Huang Rui , Paul Mackerras , Gerd Hoffmann , Daniel Bristot de Oliveira , sparclinux@vger.kernel.org, Vincent Chen , Christoph Hellwig , Arnd Bergmann , Max Filippov , Michael Ellerman , x86@kernel.org, Russell King , linux-csky@vger.kernel.org, Ingo Molnar , David Airlie , VMware Graphics , Mel Gorman , nouveau@lists.freedesktop.org, Dave Airlie , linux-snps-arc@lists.infradead.org, Ben Skeggs , linux-xtensa@linux-xtensa.org, Paul McKenney , intel-gfx@lists.freedesktop.org, Roland Scheidegger , Josef Bacik , Steven Rostedt , Linus Torvalds , Alexander Viro , spice-devel@lists.freedesktop.org, David Sterba , Dietmar Eggemann , linux-arm-kernel@lists.infradead.org, Chris Zankel , Michal Simek , Thomas Bogendoerfer , Nick Hu , Chris Mason , Vineet Gupta , linux-mips@vger.kernel.org, "David S. Miller" , Benjamin LaHaise , linux-fsdevel@vger.kernel.org, Andrew Morton , linuxppc-dev@lists.ozlabs.org, Christian Koenig , linux-btrfs@vger.kernel.org, Greentime Hu Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" There is no reason to disable pagefaults and preemption as a side effect of kmap_atomic_prot(). Use kmap_local_page_prot() instead and document the reasoning for the mapping usage with the given pgprot. Remove the NULL pointer check for the map. These functions return a valid address for valid pages and the return was bogus anyway as it would have left preemption and pagefaults disabled. Signed-off-by: Thomas Gleixner Cc: Christian Koenig Cc: Huang Rui Cc: David Airlie Cc: Daniel Vetter Cc: dri-devel@lists.freedesktop.org --- V3: New patch --- drivers/gpu/drm/ttm/ttm_bo_util.c | 20 ++++++++++++-------- 1 file changed, 12 insertions(+), 8 deletions(-) --- a/drivers/gpu/drm/ttm/ttm_bo_util.c +++ b/drivers/gpu/drm/ttm/ttm_bo_util.c @@ -181,13 +181,15 @@ static int ttm_copy_io_ttm_page(struct t return -ENOMEM; src = (void *)((unsigned long)src + (page << PAGE_SHIFT)); - dst = kmap_atomic_prot(d, prot); - if (!dst) - return -ENOMEM; + /* + * Ensure that a highmem page is mapped with the correct + * pgprot. For non highmem the mapping is already there. + */ + dst = kmap_local_page_prot(d, prot); memcpy_fromio(dst, src, PAGE_SIZE); - kunmap_atomic(dst); + kunmap_local(dst); return 0; } @@ -203,13 +205,15 @@ static int ttm_copy_ttm_io_page(struct t return -ENOMEM; dst = (void *)((unsigned long)dst + (page << PAGE_SHIFT)); - src = kmap_atomic_prot(s, prot); - if (!src) - return -ENOMEM; + /* + * Ensure that a highmem page is mapped with the correct + * pgprot. For non highmem the mapping is already there. + */ + src = kmap_local_page_prot(s, prot); memcpy_toio(dst, src, PAGE_SIZE); - kunmap_atomic(src); + kunmap_local(src); return 0; }