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 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 3E536C3ABCB for ; Mon, 12 May 2025 15:06:59 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id E895710E441; Mon, 12 May 2025 15:06:58 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="GErNkOed"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.9]) by gabe.freedesktop.org (Postfix) with ESMTPS id 4931B10E438; Mon, 12 May 2025 15:06:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1747062417; x=1778598417; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=s+UCCE9x47S//JOd07gLtkCwdD8JrSfheWOEbksTugE=; b=GErNkOedSzYZPhIYLxJLOPuMFdxFT5HFMhS9xs8HzVM9C1pCk+1QiYwy MVmoBYMdQhar33bLD4Q4T9TzAm4kyQ9eFji8r7RKdMliVlfSHzxndidiJ SubP5JYIom5u3LN6txebPX1r7SonmCtjN6UKafjQ2M+bzGClefz7RtCTv kfyuKQDJusNh1PTBko0d+1SETQsCXBFjsS2RUPrgveyiWgLCTztDKPP9s hHIbv0qAu9oHfEJy7fzMdMDx0GpCP44b0TQKOBpCf9F7K/bt2ANjDRBaZ ftKdUo/nNOYZjH7KCFgqA0kbBRC4V7kPSk+Pn3AxE6ku/LI720BJ0GSUR A==; X-CSE-ConnectionGUID: tQZG8wegSUSLPvDyeRz/Aw== X-CSE-MsgGUID: 2gRhr3YwQZ6XhgkSV7ph9g== X-IronPort-AV: E=McAfee;i="6700,10204,11431"; a="71377054" X-IronPort-AV: E=Sophos;i="6.15,282,1739865600"; d="scan'208";a="71377054" Received: from orviesa007.jf.intel.com ([10.64.159.147]) by orvoesa101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 May 2025 08:06:57 -0700 X-CSE-ConnectionGUID: MbWUkkCuQ4K5jxUxVSTQAw== X-CSE-MsgGUID: BcM/38dITemRMZfQkhOH2A== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.15,282,1739865600"; d="scan'208";a="137916548" Received: from ettammin-desk.ger.corp.intel.com (HELO mwauld-desk.intel.com) ([10.245.245.222]) by orviesa007-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 May 2025 08:06:56 -0700 From: Matthew Auld To: intel-xe@lists.freedesktop.org Cc: dri-devel@lists.freedesktop.org, =?UTF-8?q?Thomas=20Hellstr=C3=B6m?= , Matthew Brost Subject: [PATCH v4 2/8] drm/gpusvm: use more selective dma dir in get_pages() Date: Mon, 12 May 2025 16:06:40 +0100 Message-ID: <20250512150637.61462-12-matthew.auld@intel.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250512150637.61462-10-matthew.auld@intel.com> References: <20250512150637.61462-10-matthew.auld@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: intel-xe@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel Xe graphics driver List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-xe-bounces@lists.freedesktop.org Sender: "Intel-xe" If we are only reading the memory then from the device pov the direction can be DMA_TO_DEVICE. This aligns with the xe-userptr code. Using the most restrictive data direction to represent the access is normally a good idea. Signed-off-by: Matthew Auld Cc: Thomas Hellström Cc: Matthew Brost Reviewed-by: Thomas Hellström Reviewed-by: Matthew Brost --- drivers/gpu/drm/drm_gpusvm.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/drm_gpusvm.c b/drivers/gpu/drm/drm_gpusvm.c index abb78e06e810..949334ca3f5c 100644 --- a/drivers/gpu/drm/drm_gpusvm.c +++ b/drivers/gpu/drm/drm_gpusvm.c @@ -1362,6 +1362,8 @@ int drm_gpusvm_range_get_pages(struct drm_gpusvm *gpusvm, int err = 0; struct dev_pagemap *pagemap; struct drm_pagemap *dpagemap; + enum dma_data_direction dma_dir = ctx->read_only ? DMA_TO_DEVICE : + DMA_BIDIRECTIONAL; retry: hmm_range.notifier_seq = mmu_interval_read_begin(notifier); @@ -1465,7 +1467,7 @@ int drm_gpusvm_range_get_pages(struct drm_gpusvm *gpusvm, dpagemap->ops->device_map(dpagemap, gpusvm->drm->dev, page, order, - DMA_BIDIRECTIONAL); + dma_dir); if (dma_mapping_error(gpusvm->drm->dev, range->dma_addr[j].addr)) { err = -EFAULT; @@ -1482,7 +1484,7 @@ int drm_gpusvm_range_get_pages(struct drm_gpusvm *gpusvm, addr = dma_map_page(gpusvm->drm->dev, page, 0, PAGE_SIZE << order, - DMA_BIDIRECTIONAL); + dma_dir); if (dma_mapping_error(gpusvm->drm->dev, addr)) { err = -EFAULT; goto err_unmap; @@ -1490,7 +1492,7 @@ int drm_gpusvm_range_get_pages(struct drm_gpusvm *gpusvm, range->dma_addr[j] = drm_pagemap_device_addr_encode (addr, DRM_INTERCONNECT_SYSTEM, order, - DMA_BIDIRECTIONAL); + dma_dir); } i += 1 << order; num_dma_mapped = i; -- 2.49.0