From patchwork Thu Mar 28 08:32:57 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vivek Kasireddy X-Patchwork-Id: 13608223 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 C28EBC54E64 for ; Thu, 28 Mar 2024 09:01:23 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 0275111237D; Thu, 28 Mar 2024 09:01:23 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="K0cJNGKK"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.16]) by gabe.freedesktop.org (Postfix) with ESMTPS id D023511237A for ; Thu, 28 Mar 2024 09:01:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1711616465; x=1743152465; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=igOa1YqCrusDmITVY46d0ciSsUPOrUNWa/VKP9eNVUg=; b=K0cJNGKKmYjA1jxVy9fxYcaWf3qI4lLQPWdrd4bBSi1TwBfnc1ILrgdC 9ZEa1jPHkOHPQvpaRqdwlWkNYBsXehqQqSC6yGlEwLLS+E/31S3nlV5Vb FwCekWuN0oZy5m2IdraGllLGkxTZRpfbkDC4DqWdziu2KHDG6965weH7o SgEm76fsL1SwVudmQYY8XhAEejgnzXfIs8Jv4vzz32tnp0WnJXw5s7RKx UvLWGpWsow16g/JOSSSg2AZ8Q48293YgamgCtiYx0GF0JiNh8YkXE7vXO Z1wTr7expMFEqQbzL8A1L8h7M7jqs7yEJISwhYXb97ugYYCWx3M4XpMSZ Q==; X-CSE-ConnectionGUID: W10Ur8loRb2VDb/PnBQGDw== X-CSE-MsgGUID: Uw3/58UESsGZv5N9+qxpGA== X-IronPort-AV: E=McAfee;i="6600,9927,11026"; a="7355698" X-IronPort-AV: E=Sophos;i="6.07,161,1708416000"; d="scan'208";a="7355698" Received: from fmviesa003.fm.intel.com ([10.60.135.143]) by fmvoesa110.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Mar 2024 02:01:05 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.07,161,1708416000"; d="scan'208";a="21078228" Received: from vkasired-desk2.fm.intel.com ([10.105.128.132]) by fmviesa003-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Mar 2024 02:01:03 -0700 From: Vivek Kasireddy To: dri-devel@lists.freedesktop.org Cc: Vivek Kasireddy , Gerd Hoffmann Subject: [RFC 4/7] drm/virtio: Import prime buffers from other devices as guest blobs Date: Thu, 28 Mar 2024 01:32:57 -0700 Message-ID: <20240328083615.2662516-5-vivek.kasireddy@intel.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240328083615.2662516-1-vivek.kasireddy@intel.com> References: <20240328083615.2662516-1-vivek.kasireddy@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" By importing scanout buffers from other devices, we should be able to use the virtio-gpu driver in KMS only mode. Note that we attach dynamically and register a move_notify() callback so that we can let the VMM know of any location changes associated with the backing store of the imported object by sending detach_backing cmd. Cc: Gerd Hoffmann Signed-off-by: Vivek Kasireddy --- drivers/gpu/drm/virtio/virtgpu_prime.c | 54 +++++++++++++++++++++++++- 1 file changed, 53 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/virtio/virtgpu_prime.c b/drivers/gpu/drm/virtio/virtgpu_prime.c index 1e87dbc9a897..c65dacc1b2b5 100644 --- a/drivers/gpu/drm/virtio/virtgpu_prime.c +++ b/drivers/gpu/drm/virtio/virtgpu_prime.c @@ -255,10 +255,36 @@ static int virtgpu_dma_buf_init_obj(struct drm_device *dev, return ret; } +static const struct drm_gem_object_funcs virtgpu_gem_dma_buf_funcs = { + .free = virtgpu_dma_buf_free_obj, +}; + +static void virtgpu_dma_buf_move_notify(struct dma_buf_attachment *attach) +{ + struct drm_gem_object *obj = attach->importer_priv; + struct virtio_gpu_device *vgdev = obj->dev->dev_private; + struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj); + + if (bo->created) { + virtio_gpu_cmd_resource_detach_backing(vgdev, + bo->hw_res_handle); + bo->has_backing = false; + } +} + +static const struct dma_buf_attach_ops virtgpu_dma_buf_attach_ops = { + .allow_peer2peer = true, + .move_notify = virtgpu_dma_buf_move_notify +}; + struct drm_gem_object *virtgpu_gem_prime_import(struct drm_device *dev, struct dma_buf *buf) { + struct virtio_gpu_device *vgdev = dev->dev_private; + struct dma_buf_attachment *attach; + struct virtio_gpu_object *bo; struct drm_gem_object *obj; + int ret; if (buf->ops == &virtgpu_dmabuf_ops.ops) { obj = buf->priv; @@ -272,7 +298,32 @@ struct drm_gem_object *virtgpu_gem_prime_import(struct drm_device *dev, } } - return drm_gem_prime_import(dev, buf); + if (!vgdev->has_resource_blob || vgdev->has_virgl_3d) + return drm_gem_prime_import(dev, buf); + + bo = kzalloc(sizeof(*bo), GFP_KERNEL); + if (!bo) + return ERR_PTR(-ENOMEM); + + obj = &bo->base.base; + obj->funcs = &virtgpu_gem_dma_buf_funcs; + drm_gem_private_object_init(dev, obj, buf->size); + + attach = dma_buf_dynamic_attach(buf, dev->dev, + &virtgpu_dma_buf_attach_ops, obj); + if (IS_ERR(attach)) { + kfree(bo); + return ERR_CAST(attach); + } + + obj->import_attach = attach; + get_dma_buf(buf); + + ret = virtgpu_dma_buf_init_obj(dev, bo, attach); + if (ret < 0) + return ERR_PTR(ret); + + return obj; } struct drm_gem_object *virtgpu_gem_prime_import_sg_table( @@ -281,3 +332,4 @@ struct drm_gem_object *virtgpu_gem_prime_import_sg_table( { return ERR_PTR(-ENODEV); } +