From patchwork Thu Feb 20 14:28:53 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sergio Lopez X-Patchwork-Id: 13984067 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 0A6D5C021B2 for ; Thu, 20 Feb 2025 14:30:18 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 8085C10E97E; Thu, 20 Feb 2025 14:30:17 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.b="C+IqrIl6"; dkim-atps=neutral Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by gabe.freedesktop.org (Postfix) with ESMTPS id B433E10E97E for ; Thu, 20 Feb 2025 14:30:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1740061814; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=ZqVSD1LpLSPpPVhZMn461AKEdfZbFpotrJ5hf1JYSzo=; b=C+IqrIl6rjDgP7TjR3Ygx+qN4zq8c7k5SnZS20RzJNobp3YHUyOjYE/tEGHjxEnTb0Oiip KKPLPxSOWYz+Xulz6IGlGVVzE6YIjvNgckeZRb6p9Dbz4zYVknfOppBJtLOi25EDa/Liz1 LoCNPXfQWUU8o8eqrQXV8N9PxOm22Vw= Received: from mx-prod-mc-04.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-128-uf0q_LRMPpG2LoSXgm1CEw-1; Thu, 20 Feb 2025 09:30:11 -0500 X-MC-Unique: uf0q_LRMPpG2LoSXgm1CEw-1 X-Mimecast-MFC-AGG-ID: uf0q_LRMPpG2LoSXgm1CEw_1740061809 Received: from mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.111]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-04.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 992AA19039CA; Thu, 20 Feb 2025 14:30:09 +0000 (UTC) Received: from [127.0.1.1] (unknown [10.45.225.137]) by mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 459031800352; Thu, 20 Feb 2025 14:30:03 +0000 (UTC) From: Sergio Lopez Date: Thu, 20 Feb 2025 15:28:53 +0100 Subject: [PATCH RFC v3 4/4] drm/virtio: add VIRTGPU_PARAM_HOST_SHM_PAGE_SIZE to params MIME-Version: 1.0 Message-Id: <20250220-virtio-shm-page-size-v3-4-874fff6f3979@redhat.com> References: <20250220-virtio-shm-page-size-v3-0-874fff6f3979@redhat.com> In-Reply-To: <20250220-virtio-shm-page-size-v3-0-874fff6f3979@redhat.com> To: "Michael S. Tsirkin" , Daniel Verkamp , Jason Wang , Xuan Zhuo , =?utf-8?q?Eugenio_P=C3=A9rez?= , David Airlie , Gerd Hoffmann , Gurchetan Singh , Chia-I Wu , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Simona Vetter , Rob Clark , Dmitry Osipenko , fnkl.kernel@gmail.com Cc: virtualization@lists.linux.dev, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Sergio Lopez X-Developer-Signature: v=1; a=openpgp-sha256; l=1826; i=slp@redhat.com; h=from:subject:message-id; bh=1G3lJhhDiOBTd6Kzg5KWNjN2JJNHOjrLtLCcFndtJo4=; b=owEBbQKS/ZANAwAIAfRpJ40vDAI1AcsmYgBntzxLxj0atYWb4t3RuFehUqiLushP15onRAQtv nBUBU43ivSJAjMEAAEIAB0WIQS+1fz3US2GgJFC6KL0aSeNLwwCNQUCZ7c8SwAKCRD0aSeNLwwC NU5qD/4oOqN1KMjglbDjdDrCwRwOD9glVvH68wKnXtAWqHnRXuqRYAWeT2VjvkfWBp2+p3snYYu WOpjRh4K3/URic2NuHskA+s2Ycl9sGd4YJCEA1U3CWaSuhL7MO3cRark+9Sx/I1tWLLxFQOOf7H MI4n3+O2HX0D0mpUuWxvjK/NZobF2sX0xYbrE5NmNnCxxCCjFosxvvJJAqK/8/7OHJOi86kIl18 qQ5Nu3YhgywDCtFO/SDrARIM/pE5PA3kPYvwg56KkbuBs2L1cT1AcdbU4VwcYMuoUaxkd9cU42P A+ep7SleWjhOEIxmkoic4Ug8kiMXGyaG8j02Jp19BYGnTr3154A5DipKBjqfJfsUFOIHochyiU6 T/fR6JFZcAIqxcR2qjVNegcRC15ZhOq6sNEcf54Hp9hF9GAQ+3W1lzZDw4ipuXL1DMoxdxQGpR0 PMAt642wB1uVlopZe16qHKrTsfae+8aldacy5IoSy9k/i/gBCvRiTfTQQoryVr/9vO/v0505Q55 INTFR6Al5hD5+NMqLqfF4Tr9TMi4WKVbqF2ACwRG6a+BrCz5G4zE/tjasmmj/c/AmeimhenAiYI yfuA27v0NuaeRSYqNB6IfHZhb6dHMrp+O17fC1kfe5gou9mvTmscIo0sSe9d5sgCkwPay1HyW23 VkqlvlQWCYSgB0g== X-Developer-Key: i=slp@redhat.com; a=openpgp; fpr=BED5FCF7512D86809142E8A2F469278D2F0C0235 X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.111 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" Add VIRTGPU_PARAM_HOST_SHM_PAGE_SIZE as a param that can be read with VIRTGPU_GETPARAM by userspace applications running in the guest to obtain the host's page size and find out the right alignment to be used in shared memory allocations. Signed-off-by: Sergio Lopez Reviewed-by: Dmitry Osipenko --- drivers/gpu/drm/virtio/virtgpu_ioctl.c | 5 +++++ include/uapi/drm/virtgpu_drm.h | 1 + 2 files changed, 6 insertions(+) diff --git a/drivers/gpu/drm/virtio/virtgpu_ioctl.c b/drivers/gpu/drm/virtio/virtgpu_ioctl.c index c33c057365f85a2ace536f91655c903036827312..f112b862c2de4d021fb6a54a080f42ad75034227 100644 --- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c +++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c @@ -117,6 +117,11 @@ static int virtio_gpu_getparam_ioctl(struct drm_device *dev, void *data, case VIRTGPU_PARAM_EXPLICIT_DEBUG_NAME: value = vgdev->has_context_init ? 1 : 0; break; + case VIRTGPU_PARAM_HOST_SHM_PAGE_SIZE: + if (!vgdev->has_host_visible) + return -ENOENT; + value = vgdev->host_visible_region.page_size; + break; default: return -EINVAL; } diff --git a/include/uapi/drm/virtgpu_drm.h b/include/uapi/drm/virtgpu_drm.h index c2ce71987e9bb816d13a300679336cb756f1cbcf..72db6b3339e0dcaf550acbf5ac4381a6e5c2216d 100644 --- a/include/uapi/drm/virtgpu_drm.h +++ b/include/uapi/drm/virtgpu_drm.h @@ -98,6 +98,7 @@ struct drm_virtgpu_execbuffer { #define VIRTGPU_PARAM_CONTEXT_INIT 6 /* DRM_VIRTGPU_CONTEXT_INIT */ #define VIRTGPU_PARAM_SUPPORTED_CAPSET_IDs 7 /* Bitmask of supported capability set ids */ #define VIRTGPU_PARAM_EXPLICIT_DEBUG_NAME 8 /* Ability to set debug name from userspace */ +#define VIRTGPU_PARAM_HOST_SHM_PAGE_SIZE 9 /* Host SHM page size, with format PAGE_SIZE >> 12 */ struct drm_virtgpu_getparam { __u64 param;