From patchwork Thu Aug 22 10:26:14 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gerd Hoffmann X-Patchwork-Id: 11109019 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B6DE213B1 for ; Thu, 22 Aug 2019 10:26:21 +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 9EF8A233FD for ; Thu, 22 Aug 2019 10:26:21 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9EF8A233FD Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id C38506E35D; Thu, 22 Aug 2019 10:26:19 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) by gabe.freedesktop.org (Postfix) with ESMTPS id 1B39F6E35D for ; Thu, 22 Aug 2019 10:26:19 +0000 (UTC) Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 8B9607F75C; Thu, 22 Aug 2019 10:26:18 +0000 (UTC) Received: from sirius.home.kraxel.org (ovpn-116-60.ams2.redhat.com [10.36.116.60]) by smtp.corp.redhat.com (Postfix) with ESMTP id A15426012C; Thu, 22 Aug 2019 10:26:15 +0000 (UTC) Received: by sirius.home.kraxel.org (Postfix, from userid 1000) id C817516E32; Thu, 22 Aug 2019 12:26:14 +0200 (CEST) From: Gerd Hoffmann To: dri-devel@lists.freedesktop.org Subject: [PATCH v2] drm/virtio: make resource id workaround runtime switchable. Date: Thu, 22 Aug 2019 12:26:14 +0200 Message-Id: <20190822102614.18164-1-kraxel@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.6.2 (mx1.redhat.com [10.5.110.71]); Thu, 22 Aug 2019 10:26:18 +0000 (UTC) X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: David Airlie , open list , Gerd Hoffmann , "open list:VIRTIO GPU DRIVER" MIME-Version: 1.0 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Also update the comment with a reference to the virglrenderer fix. Signed-off-by: Gerd Hoffmann Reviewed-by: Chia-I Wu --- drivers/gpu/drm/virtio/virtgpu_object.c | 44 ++++++++++++++----------- 1 file changed, 24 insertions(+), 20 deletions(-) diff --git a/drivers/gpu/drm/virtio/virtgpu_object.c b/drivers/gpu/drm/virtio/virtgpu_object.c index b2da31310d24..e98aaa00578d 100644 --- a/drivers/gpu/drm/virtio/virtgpu_object.c +++ b/drivers/gpu/drm/virtio/virtgpu_object.c @@ -27,34 +27,38 @@ #include "virtgpu_drv.h" +static int virtio_gpu_virglrenderer_workaround = 1; +module_param_named(virglhack, virtio_gpu_virglrenderer_workaround, int, 0400); + static int virtio_gpu_resource_id_get(struct virtio_gpu_device *vgdev, uint32_t *resid) { -#if 0 - int handle = ida_alloc(&vgdev->resource_ida, GFP_KERNEL); - - if (handle < 0) - return handle; -#else - static int handle; - - /* - * FIXME: dirty hack to avoid re-using IDs, virglrenderer - * can't deal with that. Needs fixing in virglrenderer, also - * should figure a better way to handle that in the guest. - */ - handle++; -#endif - - *resid = handle + 1; + if (virtio_gpu_virglrenderer_workaround) { + /* + * Hack to avoid re-using resource IDs. + * + * virglrenderer versions up to (and including) 0.7.0 + * can't deal with that. virglrenderer commit + * "f91a9dd35715 Fix unlinking resources from hash + * table." (Feb 2019) fixes the bug. + */ + static int handle; + handle++; + *resid = handle + 1; + } else { + int handle = ida_alloc(&vgdev->resource_ida, GFP_KERNEL); + if (handle < 0) + return handle; + *resid = handle + 1; + } return 0; } static void virtio_gpu_resource_id_put(struct virtio_gpu_device *vgdev, uint32_t id) { -#if 0 - ida_free(&vgdev->resource_ida, id - 1); -#endif + if (!virtio_gpu_virglrenderer_workaround) { + ida_free(&vgdev->resource_ida, id - 1); + } } static void virtio_gpu_ttm_bo_destroy(struct ttm_buffer_object *tbo)