From patchwork Mon Aug 12 07:10:34 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Baolu Lu X-Patchwork-Id: 13760238 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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id CD864C3DA7F for ; Mon, 12 Aug 2024 07:14:25 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 57E2510E101; Mon, 12 Aug 2024 07:14:25 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="DqvqL9c7"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.14]) by gabe.freedesktop.org (Postfix) with ESMTPS id F39CB10E101; Mon, 12 Aug 2024 07:14:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1723446864; x=1754982864; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=nLYeFCmV2sqj4+yCU6U1t0LxOTa1hw9jyckG6WHjQvg=; b=DqvqL9c7bVT8n41u/UjrSOHj79S6IxA4cMPa2HVxKv8yRZsS1DCYKA0t vc8ferCqGO1qzNCBQ+dhVBkeiAbs6Lfs5PEZPTKc/KPA4JMg3trJj4Yg6 t9VXlsi6NTXaNc1RmsL47o94FmlQE92LM+YijjZHQKqk8Xf5r8iEkk6SZ 98rKSIXrv72sptOAJf2HulgmjzrOa2BCqWPFFQzM3JxLBRGXkh/+qod0J LLLgrVQRrsCa7Lio9xwx8AyLT8xlDLfL6XFNj651TSNg18lCFRIMnQ8Lj IZbCJrtYdiJGz1fthUI1LWYz3QDuIbmBrICUx3rI1rFoEbSqPH6WQ96/I Q==; X-CSE-ConnectionGUID: w72YHw9oRB+6fOq/LJRMGg== X-CSE-MsgGUID: 0eKasuhXTS+kufvFY1B0og== X-IronPort-AV: E=McAfee;i="6700,10204,11161"; a="21711597" X-IronPort-AV: E=Sophos;i="6.09,282,1716274800"; d="scan'208";a="21711597" Received: from fmviesa007.fm.intel.com ([10.60.135.147]) by fmvoesa108.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Aug 2024 00:14:23 -0700 X-CSE-ConnectionGUID: gDxvwbtUQGqyr6hrki+oVA== X-CSE-MsgGUID: EJqZOrj4S8WKg9ArWC+AEg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.09,282,1716274800"; d="scan'208";a="57823841" Received: from allen-box.sh.intel.com ([10.239.159.127]) by fmviesa007.fm.intel.com with ESMTP; 12 Aug 2024 00:14:17 -0700 From: Lu Baolu To: Karol Herbst , Lyude Paul , Danilo Krummrich , David Airlie , Daniel Vetter , Thierry Reding , Jonathan Hunter , Sandy Huang , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Mikko Perttunen , Joerg Roedel , Will Deacon , Robin Murphy , Jason Gunthorpe , Kevin Tian Cc: dri-devel@lists.freedesktop.org, nouveau@lists.freedesktop.org, linux-tegra@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, linux-media@vger.kernel.org, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, Lu Baolu Subject: [PATCH 3/3] drm/tegra: Remove call to iommu_domain_alloc() Date: Mon, 12 Aug 2024 15:10:34 +0800 Message-Id: <20240812071034.9443-3-baolu.lu@linux.intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240812071034.9443-1-baolu.lu@linux.intel.com> References: <20240812071034.9443-1-baolu.lu@linux.intel.com> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Commit <17de3f5fdd35> ("iommu: Retire bus ops") removes iommu ops from the bus structure. The iommu subsystem no longer relies on bus for operations. So iommu_domain_alloc() interface is no longer relevant. Normally, iommu_paging_domain_alloc() could be a replacement for iommu_domain_alloc() if the caller has the right device for IOMMU API use. Unfortunately, this is not the case for this driver. Iterate the devices on the platform bus and find a suitable device whose device DMA is translated by an IOMMU. Then use this device to allocate an iommu domain. The iommu subsystem prevents domains allocated by one iommu driver from being attached to devices managed by any different iommu driver. Signed-off-by: Lu Baolu Link: https://lore.kernel.org/r/20240610085555.88197-20-baolu.lu@linux.intel.com --- drivers/gpu/drm/tegra/drm.c | 34 +++++++++++++++++++++++++--------- 1 file changed, 25 insertions(+), 9 deletions(-) diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c index 03d1c76aec2d..ee391f859992 100644 --- a/drivers/gpu/drm/tegra/drm.c +++ b/drivers/gpu/drm/tegra/drm.c @@ -1133,6 +1133,17 @@ static bool host1x_drm_wants_iommu(struct host1x_device *dev) return domain != NULL; } +static int iommu_mapped_device(struct device *dev, void *data) +{ + struct device **iommu_dev = data; + + if (!device_iommu_mapped(dev)) + return 0; + + *iommu_dev = dev; + return 1; +} + static int host1x_drm_probe(struct host1x_device *dev) { struct tegra_drm *tegra; @@ -1149,16 +1160,21 @@ static int host1x_drm_probe(struct host1x_device *dev) goto put; } - if (host1x_drm_wants_iommu(dev) && iommu_present(&platform_bus_type)) { - tegra->domain = iommu_domain_alloc(&platform_bus_type); - if (!tegra->domain) { - err = -ENOMEM; - goto free; + if (host1x_drm_wants_iommu(dev)) { + struct device *iommu_dev = NULL; + + bus_for_each_dev(&platform_bus_type, NULL, &iommu_dev, iommu_mapped_device); + if (iommu_dev) { + tegra->domain = iommu_paging_domain_alloc(iommu_dev); + if (IS_ERR(tegra->domain)) { + err = PTR_ERR(tegra->domain); + goto free; + } + + err = iova_cache_get(); + if (err < 0) + goto domain; } - - err = iova_cache_get(); - if (err < 0) - goto domain; } mutex_init(&tegra->clients_lock);