From patchwork Mon Dec 16 09:54:15 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wei Lin Guay X-Patchwork-Id: 13909477 Received: from mx0b-00082601.pphosted.com (mx0b-00082601.pphosted.com [67.231.153.30]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E106F202C20 for ; Mon, 16 Dec 2024 09:56:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=67.231.153.30 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734342967; cv=none; b=f+x/zY9SdWxq5bHFY7ml4/o+7Tk8c3wwldmId7dCNc2STyC2vv2HCtpa6UXDXIFRaArBYXD9efjxgzCXTpyc9BHtSix3nZOWQ/CfoXV2Jg2+wyzDig/76KiONt3JjIyqnmhDWF6TZLwLN8G7bDQZXBDj8egmVqQZ3u8iC8lOfYk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734342967; c=relaxed/simple; bh=Kz2Cz4xXyqqOVI8c2RbvbXyNjFWqxi9UxkpAys98eIY=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=SIRXtABnlzc+ZP+24/Yw/+AmvDfOVVe0gXkcZ6LvnXyTi116MO5jebm/1Q3Pp+zWQAWiM7Ou/WsaMCTzo6lZWerjqr8VTQ3yys3clQMuUZvR+npBjSvKmIyUxfPBswBqIEtBXdKSE5x9hFsucEaLft+FRpM+otZkVmiDswclsgs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=fb.com; spf=pass smtp.mailfrom=meta.com; dkim=pass (1024-bit key) header.d=fb.com header.i=@fb.com header.b=B7qmAEfd; arc=none smtp.client-ip=67.231.153.30 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=fb.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=meta.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=fb.com header.i=@fb.com header.b="B7qmAEfd" Received: from pps.filterd (m0109332.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 4BG6pHO1018658 for ; Mon, 16 Dec 2024 01:56:03 -0800 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.com; h=cc :content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s=facebook; bh=f 0d7e7vgSwFquFJynHv37WoE8Ih8RaPc8Rz59bR6mwY=; b=B7qmAEfd6Hw1WrqBY rI6Id5raq5HcPYbzvpRd92TkRoruGjZCL4ESORWNJi3LIv3lFfvYpddgUUyqfK4x iaDkbnsI4jfNF8dS/c0qSjt5rhcsLgNOKc8NsSVWM2TfTVrN+yIelnSpQs+G2QTu ogBvp27b++9IdRhaGkDu2h/kh8= Received: from maileast.thefacebook.com ([163.114.135.16]) by mx0a-00082601.pphosted.com (PPS) with ESMTPS id 43jfa28tc0-4 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Mon, 16 Dec 2024 01:56:03 -0800 (PST) Received: from twshared60378.16.frc2.facebook.com (2620:10d:c0a8:1c::11) by mail.thefacebook.com (2620:10d:c0a9:6f::237c) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.2.1544.11; Mon, 16 Dec 2024 09:56:01 +0000 Received: by devvm12370.nha0.facebook.com (Postfix, from userid 624418) id D5AF610A1F005; Mon, 16 Dec 2024 01:55:55 -0800 (PST) From: Wei Lin Guay To: , , , CC: , , , , , Wei Lin Guay Subject: [PATCH 1/4] vfio: Add vfio_device_get() Date: Mon, 16 Dec 2024 01:54:15 -0800 Message-ID: <20241216095429.210792-2-wguay@fb.com> X-Mailer: git-send-email 2.43.5 In-Reply-To: <20241216095429.210792-1-wguay@fb.com> References: <20241216095429.210792-1-wguay@fb.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-FB-Internal: Safe X-Proofpoint-GUID: bK-L9H6HUIq81TvL0O_GVdeGjOcASFdg X-Proofpoint-ORIG-GUID: bK-L9H6HUIq81TvL0O_GVdeGjOcASFdg X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1051,Hydra:6.0.680,FMLib:17.12.62.30 definitions=2024-10-05_03,2024-10-04_01,2024-09-30_01 From: Jason Gunthorpe Summary: To increment a reference the caller already holds. Export vfio_device_put() to pair with it. Signed-off-by: Jason Gunthorpe Signed-off-by: Wei Lin Guay Reviewed-by: Dag Moxnes Reviewed-by: Keith Busch Reviewed-by: Nic Viljoen --- drivers/vfio/vfio_main.c | 1 + include/linux/vfio.h | 6 ++++++ 2 files changed, 7 insertions(+) -- 2.43.5 diff --git a/drivers/vfio/vfio_main.c b/drivers/vfio/vfio_main.c index a5a62d9d963f..7e318e15abd5 100644 --- a/drivers/vfio/vfio_main.c +++ b/drivers/vfio/vfio_main.c @@ -171,6 +171,7 @@ void vfio_device_put_registration(struct vfio_device *device) if (refcount_dec_and_test(&device->refcount)) complete(&device->comp); } +EXPORT_SYMBOL_GPL(vfio_device_put_registration); bool vfio_device_try_get_registration(struct vfio_device *device) { diff --git a/include/linux/vfio.h b/include/linux/vfio.h index 000a6cab2d31..d7c790be4bbc 100644 --- a/include/linux/vfio.h +++ b/include/linux/vfio.h @@ -279,6 +279,12 @@ static inline void vfio_put_device(struct vfio_device *device) int vfio_register_group_dev(struct vfio_device *device); int vfio_register_emulated_iommu_dev(struct vfio_device *device); void vfio_unregister_group_dev(struct vfio_device *device); +void vfio_device_put_registration(struct vfio_device *device); + +static inline void vfio_device_get(struct vfio_device *device) +{ + refcount_inc(&device->refcount); +} int vfio_assign_device_set(struct vfio_device *device, void *set_id); unsigned int vfio_device_set_open_count(struct vfio_device_set *dev_set);