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 X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 26A1DC3B18B for ; Thu, 13 Feb 2020 13:22:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DB4DB218AC for ; Thu, 13 Feb 2020 13:22:17 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="DwAQiWzh" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730004AbgBMNWO (ORCPT ); Thu, 13 Feb 2020 08:22:14 -0500 Received: from us-smtp-delivery-1.mimecast.com ([205.139.110.120]:28232 "EHLO us-smtp-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1729952AbgBMNWO (ORCPT ); Thu, 13 Feb 2020 08:22:14 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1581600133; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:in-reply-to:in-reply-to:references:references; bh=9A+wSkyxusnRX7BicnjW3WSbmTih3JMxMiULkIbUYv8=; b=DwAQiWzh+j5SyzjKQyRlXUHTbv47WwZ5OHCjk+6L+vAdIAlXGQiWr/nQXbQ8tJxwLnwZkm It4IjnRLm9c+zTEumaaucZ36YmMDxdC+rcnxi8/BqGWy8ALBnrCO37TC3/5MpJYAU4EuS/ gKin+tt8RS4jby8qYjBI/ZtnauVvgyw= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-350-oQB6h8WnMoe3oyTrqDIccA-1; Thu, 13 Feb 2020 08:22:09 -0500 X-MC-Unique: oQB6h8WnMoe3oyTrqDIccA-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 58627800D41; Thu, 13 Feb 2020 13:22:08 +0000 (UTC) Received: from sirius.home.kraxel.org (ovpn-117-39.ams2.redhat.com [10.36.117.39]) by smtp.corp.redhat.com (Postfix) with ESMTP id D0BDC26FB9; Thu, 13 Feb 2020 13:22:04 +0000 (UTC) Received: by sirius.home.kraxel.org (Postfix, from userid 1000) id 2538D9B0B; Thu, 13 Feb 2020 14:22:04 +0100 (CET) From: Gerd Hoffmann To: dri-devel@lists.freedesktop.org Cc: olvaffe@gmail.com, gurchetansingh@chromium.org, Gerd Hoffmann , David Airlie , Daniel Vetter , virtualization@lists.linux-foundation.org (open list:VIRTIO GPU DRIVER), linux-kernel@vger.kernel.org (open list) Subject: [PATCH v3 1/4] drm/virtio: rework notification for better batching Date: Thu, 13 Feb 2020 14:22:00 +0100 Message-Id: <20200213132203.23441-2-kraxel@redhat.com> In-Reply-To: <20200213132203.23441-1-kraxel@redhat.com> References: <20200213132203.23441-1-kraxel@redhat.com> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Drop the virtio_gpu_{disable,enable}_notify(). Add a new virtio_gpu_notify() call instead, which must be called whenever the driver wants make sure the host is notified needed. Drop automatic notification from command submission. Add virtio_gpu_notify() calls after each command query instead. This allows more fine-grained control over host notification and can move around the notify calls in subsequent patches to batch command submissions. With this in place it is also possible to make notification optional for userspace ioctls. Page flip batching goes away (temporarely). v3: - move batching to separate patches. v2: - rebase to latest drm-misc-next. - use "if (!atomic_read())". - add review & test tags. Signed-off-by: Gerd Hoffmann Reviewed-by: Gurchetan Singh Tested-by: Gurchetan Singh --- drivers/gpu/drm/virtio/virtgpu_drv.h | 6 ++-- drivers/gpu/drm/virtio/virtgpu_plane.c | 4 --- drivers/gpu/drm/virtio/virtgpu_vq.c | 50 ++++++++++++++++---------- 3 files changed, 33 insertions(+), 27 deletions(-) diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h b/drivers/gpu/drm/virtio/virtgpu_drv.h index af9403e1cf78..2f6c4ccbfd14 100644 --- a/drivers/gpu/drm/virtio/virtgpu_drv.h +++ b/drivers/gpu/drm/virtio/virtgpu_drv.h @@ -179,8 +179,7 @@ struct virtio_gpu_device { struct virtio_gpu_queue cursorq; struct kmem_cache *vbufs; - bool disable_notify; - bool pending_notify; + atomic_t pending_commands; struct ida resource_ida; @@ -335,8 +334,7 @@ void virtio_gpu_dequeue_ctrl_func(struct work_struct *work); void virtio_gpu_dequeue_cursor_func(struct work_struct *work); void virtio_gpu_dequeue_fence_func(struct work_struct *work); -void virtio_gpu_disable_notify(struct virtio_gpu_device *vgdev); -void virtio_gpu_enable_notify(struct virtio_gpu_device *vgdev); +void virtio_gpu_notify(struct virtio_gpu_device *vgdev); /* virtio_gpu_display.c */ void virtio_gpu_modeset_init(struct virtio_gpu_device *vgdev); diff --git a/drivers/gpu/drm/virtio/virtgpu_plane.c b/drivers/gpu/drm/virtio/virtgpu_plane.c index d1c3f5fbfee4..08b2e4127eb3 100644 --- a/drivers/gpu/drm/virtio/virtgpu_plane.c +++ b/drivers/gpu/drm/virtio/virtgpu_plane.c @@ -154,8 +154,6 @@ static void virtio_gpu_primary_plane_update(struct drm_plane *plane, if (!drm_atomic_helper_damage_merged(old_state, plane->state, &rect)) return; - virtio_gpu_disable_notify(vgdev); - bo = gem_to_virtio_gpu_obj(plane->state->fb->obj[0]); if (bo->dumb) virtio_gpu_update_dumb_bo(vgdev, plane->state, &rect); @@ -186,8 +184,6 @@ static void virtio_gpu_primary_plane_update(struct drm_plane *plane, rect.y1, rect.x2 - rect.x1, rect.y2 - rect.y1); - - virtio_gpu_enable_notify(vgdev); } static int virtio_gpu_cursor_prepare_fb(struct drm_plane *plane, diff --git a/drivers/gpu/drm/virtio/virtgpu_vq.c b/drivers/gpu/drm/virtio/virtgpu_vq.c index cfe9c54f87a3..812212975440 100644 --- a/drivers/gpu/drm/virtio/virtgpu_vq.c +++ b/drivers/gpu/drm/virtio/virtgpu_vq.c @@ -329,7 +329,6 @@ static void virtio_gpu_queue_ctrl_sgs(struct virtio_gpu_device *vgdev, int incnt) { struct virtqueue *vq = vgdev->ctrlq.vq; - bool notify = false; int ret, idx; if (!drm_dev_enter(vgdev->ddev, &idx)) { @@ -368,16 +367,10 @@ static void virtio_gpu_queue_ctrl_sgs(struct virtio_gpu_device *vgdev, trace_virtio_gpu_cmd_queue(vq, virtio_gpu_vbuf_ctrl_hdr(vbuf)); - notify = virtqueue_kick_prepare(vq); + atomic_inc(&vgdev->pending_commands); spin_unlock(&vgdev->ctrlq.qlock); - if (notify) { - if (vgdev->disable_notify) - vgdev->pending_notify = true; - else - virtqueue_notify(vq); - } drm_dev_exit(idx); } @@ -434,19 +427,20 @@ static void virtio_gpu_queue_fenced_ctrl_buffer(struct virtio_gpu_device *vgdev, } } -void virtio_gpu_disable_notify(struct virtio_gpu_device *vgdev) +void virtio_gpu_notify(struct virtio_gpu_device *vgdev) { - vgdev->disable_notify = true; -} + bool notify; -void virtio_gpu_enable_notify(struct virtio_gpu_device *vgdev) -{ - vgdev->disable_notify = false; - - if (!vgdev->pending_notify) + if (!atomic_read(&vgdev->pending_commands)) return; - vgdev->pending_notify = false; - virtqueue_notify(vgdev->ctrlq.vq); + + spin_lock(&vgdev->ctrlq.qlock); + atomic_set(&vgdev->pending_commands, 0); + notify = virtqueue_kick_prepare(vgdev->ctrlq.vq); + spin_unlock(&vgdev->ctrlq.qlock); + + if (notify) + virtqueue_notify(vgdev->ctrlq.vq); } static void virtio_gpu_queue_ctrl_buffer(struct virtio_gpu_device *vgdev, @@ -520,6 +514,7 @@ void virtio_gpu_cmd_create_resource(struct virtio_gpu_device *vgdev, cmd_p->height = cpu_to_le32(params->height); virtio_gpu_queue_fenced_ctrl_buffer(vgdev, vbuf, fence); + virtio_gpu_notify(vgdev); bo->created = true; } @@ -549,6 +544,7 @@ void virtio_gpu_cmd_unref_resource(struct virtio_gpu_device *vgdev, vbuf->resp_cb_data = bo; virtio_gpu_queue_ctrl_buffer(vgdev, vbuf); + virtio_gpu_notify(vgdev); } void virtio_gpu_cmd_set_scanout(struct virtio_gpu_device *vgdev, @@ -571,6 +567,7 @@ void virtio_gpu_cmd_set_scanout(struct virtio_gpu_device *vgdev, cmd_p->r.y = cpu_to_le32(y); virtio_gpu_queue_ctrl_buffer(vgdev, vbuf); + virtio_gpu_notify(vgdev); } void virtio_gpu_cmd_resource_flush(struct virtio_gpu_device *vgdev, @@ -592,6 +589,7 @@ void virtio_gpu_cmd_resource_flush(struct virtio_gpu_device *vgdev, cmd_p->r.y = cpu_to_le32(y); virtio_gpu_queue_ctrl_buffer(vgdev, vbuf); + virtio_gpu_notify(vgdev); } void virtio_gpu_cmd_transfer_to_host_2d(struct virtio_gpu_device *vgdev, @@ -624,6 +622,7 @@ void virtio_gpu_cmd_transfer_to_host_2d(struct virtio_gpu_device *vgdev, cmd_p->r.y = cpu_to_le32(y); virtio_gpu_queue_fenced_ctrl_buffer(vgdev, vbuf, fence); + virtio_gpu_notify(vgdev); } static void @@ -647,6 +646,7 @@ virtio_gpu_cmd_resource_attach_backing(struct virtio_gpu_device *vgdev, vbuf->data_size = sizeof(*ents) * nents; virtio_gpu_queue_fenced_ctrl_buffer(vgdev, vbuf, fence); + virtio_gpu_notify(vgdev); } static void virtio_gpu_cmd_get_display_info_cb(struct virtio_gpu_device *vgdev, @@ -779,6 +779,7 @@ int virtio_gpu_cmd_get_display_info(struct virtio_gpu_device *vgdev) vgdev->display_info_pending = true; cmd_p->type = cpu_to_le32(VIRTIO_GPU_CMD_GET_DISPLAY_INFO); virtio_gpu_queue_ctrl_buffer(vgdev, vbuf); + virtio_gpu_notify(vgdev); return 0; } @@ -802,6 +803,7 @@ int virtio_gpu_cmd_get_capset_info(struct virtio_gpu_device *vgdev, int idx) cmd_p->hdr.type = cpu_to_le32(VIRTIO_GPU_CMD_GET_CAPSET_INFO); cmd_p->capset_index = cpu_to_le32(idx); virtio_gpu_queue_ctrl_buffer(vgdev, vbuf); + virtio_gpu_notify(vgdev); return 0; } @@ -877,6 +879,7 @@ int virtio_gpu_cmd_get_capset(struct virtio_gpu_device *vgdev, cmd_p->capset_version = cpu_to_le32(version); *cache_p = cache_ent; virtio_gpu_queue_ctrl_buffer(vgdev, vbuf); + virtio_gpu_notify(vgdev); return 0; } @@ -904,6 +907,7 @@ int virtio_gpu_cmd_get_edids(struct virtio_gpu_device *vgdev) cmd_p->hdr.type = cpu_to_le32(VIRTIO_GPU_CMD_GET_EDID); cmd_p->scanout = cpu_to_le32(scanout); virtio_gpu_queue_ctrl_buffer(vgdev, vbuf); + virtio_gpu_notify(vgdev); } return 0; @@ -924,6 +928,7 @@ void virtio_gpu_cmd_context_create(struct virtio_gpu_device *vgdev, uint32_t id, strncpy(cmd_p->debug_name, name, sizeof(cmd_p->debug_name) - 1); cmd_p->debug_name[sizeof(cmd_p->debug_name) - 1] = 0; virtio_gpu_queue_ctrl_buffer(vgdev, vbuf); + virtio_gpu_notify(vgdev); } void virtio_gpu_cmd_context_destroy(struct virtio_gpu_device *vgdev, @@ -938,6 +943,7 @@ void virtio_gpu_cmd_context_destroy(struct virtio_gpu_device *vgdev, cmd_p->hdr.type = cpu_to_le32(VIRTIO_GPU_CMD_CTX_DESTROY); cmd_p->hdr.ctx_id = cpu_to_le32(id); virtio_gpu_queue_ctrl_buffer(vgdev, vbuf); + virtio_gpu_notify(vgdev); } void virtio_gpu_cmd_context_attach_resource(struct virtio_gpu_device *vgdev, @@ -956,7 +962,7 @@ void virtio_gpu_cmd_context_attach_resource(struct virtio_gpu_device *vgdev, cmd_p->hdr.ctx_id = cpu_to_le32(ctx_id); cmd_p->resource_id = cpu_to_le32(bo->hw_res_handle); virtio_gpu_queue_ctrl_buffer(vgdev, vbuf); - + virtio_gpu_notify(vgdev); } void virtio_gpu_cmd_context_detach_resource(struct virtio_gpu_device *vgdev, @@ -975,6 +981,7 @@ void virtio_gpu_cmd_context_detach_resource(struct virtio_gpu_device *vgdev, cmd_p->hdr.ctx_id = cpu_to_le32(ctx_id); cmd_p->resource_id = cpu_to_le32(bo->hw_res_handle); virtio_gpu_queue_ctrl_buffer(vgdev, vbuf); + virtio_gpu_notify(vgdev); } void @@ -1006,6 +1013,8 @@ virtio_gpu_cmd_resource_create_3d(struct virtio_gpu_device *vgdev, cmd_p->flags = cpu_to_le32(params->flags); virtio_gpu_queue_fenced_ctrl_buffer(vgdev, vbuf, fence); + virtio_gpu_notify(vgdev); + bo->created = true; } @@ -1039,6 +1048,7 @@ void virtio_gpu_cmd_transfer_to_host_3d(struct virtio_gpu_device *vgdev, cmd_p->level = cpu_to_le32(level); virtio_gpu_queue_fenced_ctrl_buffer(vgdev, vbuf, fence); + virtio_gpu_notify(vgdev); } void virtio_gpu_cmd_transfer_from_host_3d(struct virtio_gpu_device *vgdev, @@ -1065,6 +1075,7 @@ void virtio_gpu_cmd_transfer_from_host_3d(struct virtio_gpu_device *vgdev, cmd_p->level = cpu_to_le32(level); virtio_gpu_queue_fenced_ctrl_buffer(vgdev, vbuf, fence); + virtio_gpu_notify(vgdev); } void virtio_gpu_cmd_submit(struct virtio_gpu_device *vgdev, @@ -1088,6 +1099,7 @@ void virtio_gpu_cmd_submit(struct virtio_gpu_device *vgdev, cmd_p->size = cpu_to_le32(data_size); virtio_gpu_queue_fenced_ctrl_buffer(vgdev, vbuf, fence); + virtio_gpu_notify(vgdev); } int virtio_gpu_object_attach(struct virtio_gpu_device *vgdev, -- 2.18.2