From patchwork Tue Jul 4 15:50:02 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Zimmermann X-Patchwork-Id: 699180 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1DB0DC05052 for ; Tue, 4 Jul 2023 16:01:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231523AbjGDQBn (ORCPT ); Tue, 4 Jul 2023 12:01:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56282 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231349AbjGDQBj (ORCPT ); Tue, 4 Jul 2023 12:01:39 -0400 Received: from smtp-out2.suse.de (smtp-out2.suse.de [195.135.220.29]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 01A7910C8; Tue, 4 Jul 2023 09:01:37 -0700 (PDT) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id 741971FE56; Tue, 4 Jul 2023 16:01:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1688486496; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=J+3lz47dP6MxN3OpfYH2SM01nxUju4y/iq3PJaWbce4=; b=nlzwADnjUI10ghCyK0YnjE5aoj4TqJ8ssx95r3tNPxvOW3yx3eFRlgem0M+ocZrN5qjfgU 12YSn6roHLl5J5d70/Iej/SLV8LVM7RbC3s8QN96I01JIWZH/HH5ywgquEYoHtrYlExac7 R7FlmvuqQ7YuPVFOYNZy82bG1uL3PhA= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1688486496; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=J+3lz47dP6MxN3OpfYH2SM01nxUju4y/iq3PJaWbce4=; b=D1v5ty2+5abffNMDkOo7qJsChBKKfQaX1ccvaMkEiWgRVOCMLxerkhgOkHdRwIzooMym2R cGLHuEDwIxgwIqBA== Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id 2E0D6139ED; Tue, 4 Jul 2023 16:01:36 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id GMtdCmBCpGTzLwAAMHmgww (envelope-from ); Tue, 04 Jul 2023 16:01:36 +0000 From: Thomas Zimmermann To: javierm@redhat.com, maarten.lankhorst@linux.intel.com, mripard@kernel.org Cc: dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-tegra@vger.kernel.org, linux-fbdev@vger.kernel.org, Thomas Zimmermann , Inki Dae , Seung-Woo Kim , Kyungmin Park , Krzysztof Kozlowski , Alim Akhtar Subject: [PATCH 05/10] drm/exynos: Use fbdev DMA helpers Date: Tue, 4 Jul 2023 17:50:02 +0200 Message-ID: <20230704160133.20261-6-tzimmermann@suse.de> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230704160133.20261-1-tzimmermann@suse.de> References: <20230704160133.20261-1-tzimmermann@suse.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-samsung-soc@vger.kernel.org Use fbdev's DMA helpers for fbdev emulation. They drivers previously used the I/O-memory helpers, while allocating DMA-able system memory. This could (in theory) result in bus errors from accessing the memory range. This bug has been present since the exynos driver was first added. Signed-off-by: Thomas Zimmermann Fixes: 1c248b7d2960 ("DRM: add DRM Driver for Samsung SoC EXYNOS4210.") Cc: Inki Dae Cc: Seung-Woo Kim Cc: Kyungmin Park Cc: Krzysztof Kozlowski Cc: Alim Akhtar --- drivers/gpu/drm/exynos/Kconfig | 2 +- drivers/gpu/drm/exynos/exynos_drm_fbdev.c | 4 ++-- 2 files changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/exynos/Kconfig b/drivers/gpu/drm/exynos/Kconfig index 7ca7e1dab52c..661b42ad4873 100644 --- a/drivers/gpu/drm/exynos/Kconfig +++ b/drivers/gpu/drm/exynos/Kconfig @@ -7,7 +7,7 @@ config DRM_EXYNOS select DRM_DISPLAY_HELPER if DRM_EXYNOS_DP select DRM_KMS_HELPER select VIDEOMODE_HELPERS - select FB_IO_HELPERS if DRM_FBDEV_EMULATION + select FB_DMA_HELPERS if DRM_FBDEV_EMULATION select SND_SOC_HDMI_CODEC if SND_SOC help Choose this option if you have a Samsung SoC Exynos chipset. diff --git a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c index fdf65587f1fe..7ca3424b59ce 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c +++ b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c @@ -49,9 +49,9 @@ static void exynos_drm_fb_destroy(struct fb_info *info) static const struct fb_ops exynos_drm_fb_ops = { .owner = THIS_MODULE, - __FB_DEFAULT_IO_OPS_RDWR, + __FB_DEFAULT_DMA_OPS_RDWR, DRM_FB_HELPER_DEFAULT_OPS, - __FB_DEFAULT_IO_OPS_DRAW, + __FB_DEFAULT_DMA_OPS_DRAW, .fb_mmap = exynos_drm_fb_mmap, .fb_destroy = exynos_drm_fb_destroy, };