From patchwork Wed Feb 14 23:36:38 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Elizabeth Figura X-Patchwork-Id: 201182 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a05:7300:b825:b0:106:860b:bbdd with SMTP id da37csp60413dyb; Wed, 14 Feb 2024 15:54:28 -0800 (PST) X-Forwarded-Encrypted: i=3; AJvYcCXRigJnWVSmm7P28HPWwwxCubg1n0wgPLUUZZcq+BtvYwCoPVTpcTlqyZXumSZirpmPC+GvKrsvFweNwMCw/3knfwX1iw== X-Google-Smtp-Source: AGHT+IGE1DhNN138g45H6EDqfmEgWza94U7a1XD2aY8nmdebKf3CwDAC8Ty51B5814pakxWFOZSR X-Received: by 2002:a05:6808:140e:b0:3c0:371d:3504 with SMTP id w14-20020a056808140e00b003c0371d3504mr419313oiv.5.1707954868626; Wed, 14 Feb 2024 15:54:28 -0800 (PST) ARC-Seal: i=2; a=rsa-sha256; t=1707954868; cv=pass; d=google.com; s=arc-20160816; b=Mwcg3nyRvmwZeli7w6G0XCPokzyRkhOjgaDmgNvI967ElQo3fM0sUaVoidYvAFDt3w tPnYhu3+CEq+b0nKmwwLzpvXT08DWScU2oRhe0I18H2/iVaZ9u7MJC8Q68ULbckmKqH0 ZehE13yu5LU8t62+BpgPzPeCkd02pIAiRuKzBT0kPKJHW77y5+nFank+4mJrfjmy0P+S +vpL6ZVMa2QqJJtN5d9Frnc95r14QXX1myCW5Rc/8OI36FsP7OKOi8l8Isv2wcvjZyQU B8rSkVsiCGsFWovtbDcHJ7ah4Cs9cNBMOqnAWBePdbESej5C/8M3C2EXSP5LHWLL4maG K8Rg== ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=content-transfer-encoding:mime-version:list-unsubscribe :list-subscribe:list-id:precedence:references:in-reply-to:message-id :date:subject:cc:to:from:dkim-signature; bh=lHwW4zT2kOoH+YNEOKMeIBkf5DIZZR6wMENN39LT3Xo=; fh=sOAzP1IXJnllEbSCBRlwdfT0MN3UiaRLwzx1Tpw7GJA=; b=u+8OWDdXfVqdvBPsyFQRW/kxwnRhO8kI3KYjKXH5MsZyx8zBe87DLzZrAjiaKQ6jHf YWkAzGhD6897t0HdwuCMWgCECem6CUS51UQ0o99RfqPsS/cR8Xmgcbf9gbWbEeXh57a/ WopFG+C+ug4+13gd9CBPaliQdi7di+xl96q49M+sNq9t5uFBlzgGpZKLyy7HDQshR5xt YAN9Zt0Q7bl1R5EfQ/g3gSzAgpQjx9wZ+lJXeb6t1NQYquDjiuQ9CsG7Pp2fdZBwb5r4 jH977giSLabjuuMvKQlUp4dAWrGKrKXzuWbAReKInw/z1d2+fiHw3L9Nd8ERk/MxsatX G0GQ==; dara=google.com ARC-Authentication-Results: i=2; mx.google.com; dkim=pass header.i=@codeweavers.com header.s=s1 header.b=SFcIg0pv; arc=pass (i=1 spf=pass spfdomain=codeweavers.com dkim=pass dkdomain=codeweavers.com dmarc=pass fromdomain=codeweavers.com); spf=pass (google.com: domain of linux-kernel+bounces-66139-ouuuleilei=gmail.com@vger.kernel.org designates 139.178.88.99 as permitted sender) smtp.mailfrom="linux-kernel+bounces-66139-ouuuleilei=gmail.com@vger.kernel.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=codeweavers.com Received: from sv.mirrors.kernel.org (sv.mirrors.kernel.org. [139.178.88.99]) by mx.google.com with ESMTPS id n23-20020a638f17000000b005dc55690b2bsi7876pgd.324.2024.02.14.15.54.28 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 14 Feb 2024 15:54:28 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel+bounces-66139-ouuuleilei=gmail.com@vger.kernel.org designates 139.178.88.99 as permitted sender) client-ip=139.178.88.99; Authentication-Results: mx.google.com; dkim=pass header.i=@codeweavers.com header.s=s1 header.b=SFcIg0pv; arc=pass (i=1 spf=pass spfdomain=codeweavers.com dkim=pass dkdomain=codeweavers.com dmarc=pass fromdomain=codeweavers.com); spf=pass (google.com: domain of linux-kernel+bounces-66139-ouuuleilei=gmail.com@vger.kernel.org designates 139.178.88.99 as permitted sender) smtp.mailfrom="linux-kernel+bounces-66139-ouuuleilei=gmail.com@vger.kernel.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=codeweavers.com Received: from smtp.subspace.kernel.org (wormhole.subspace.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by sv.mirrors.kernel.org (Postfix) with ESMTPS id 5AB8A287DE2 for ; Wed, 14 Feb 2024 23:54:28 +0000 (UTC) Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by smtp.subspace.kernel.org (Postfix) with ESMTP id A6E3B145FFD; Wed, 14 Feb 2024 23:53:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=codeweavers.com header.i=@codeweavers.com header.b="SFcIg0pv" Received: from mail.codeweavers.com (mail.codeweavers.com [4.36.192.163]) (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 1181D145B2C; Wed, 14 Feb 2024 23:53:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=4.36.192.163 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707954802; cv=none; b=UzCYQrXgAokpi1zexWRp+zEf4s5gynIOh5lN7DVRqx1v+siQCy8xg56hwVxSi43BhKYKtwES0i3qje5lM4pMHwHlxToibL52Qs+JgQqfSzkBryqgTNm7BQWnal24mnP0Wb7hgoGCRyIoUqydYU2NHkhfN2flz6jWm/NOpZR7zbY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707954802; c=relaxed/simple; bh=5/Mn5ps7n4SQKWZX1KTG6D74zm3D8qkkGwwpR0oR9YY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=InLV5DNpvHg7KfXquAmIiILGaydfUfYQaF+oayQfYK4oReRewugQlHL4R4W7R/i8vqD13jCZw/mp90/bSKCuqkqVDCF5Mjnxl1w4NQgR6RfBtYiECWeIF7x1CiMYYpPT9LV+PK1xhqfpqSA3hgMulrnusCqtdcyvSyiXXbdd7qk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=codeweavers.com; spf=pass smtp.mailfrom=codeweavers.com; dkim=pass (2048-bit key) header.d=codeweavers.com header.i=@codeweavers.com header.b=SFcIg0pv; arc=none smtp.client-ip=4.36.192.163 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=codeweavers.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=codeweavers.com DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=codeweavers.com; s=s1; h=Message-ID:Date:Subject:Cc:To:From:Sender; bh=lHwW4zT2kOoH+YNEOKMeIBkf5DIZZR6wMENN39LT3Xo=; b=SFcIg0pvgcPYO26bsLRnZN1/BY 56/VIa6wwRjQtaSO1R2Svk7IupKtdmSjW46ZvScESkC7VS+S09steAgZYRalXzidwFTZmx3X5OJo1 58s/F7h47GWDMQ7h936/ut2Gc4v54D9Q9fYlL0YIJ08i09gWUTOtEd+Vt0cL30zCo954oFaiieWA2 gB2evYh6AlckC5BwzpH21+NSZOLSejBhVBUPDXSKMfb5/fUs627GTGbbfIB3TtgPkjZqeaN5tDA7c zWYYU0wliKpp5z2OLiNDEklnYyCYS8hSsIp7Ads7a5E2vw78iXsrmImYe9LUokZ0O2pxr/XfYmYYJ cSPL9Zkg==; Received: from cw137ip160.mn.codeweavers.com ([10.69.137.160] helo=camazotz.mn.codeweavers.com) by mail.codeweavers.com with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1raOoW-00GbiL-0b; Wed, 14 Feb 2024 17:37:16 -0600 From: Elizabeth Figura To: Arnd Bergmann , Greg Kroah-Hartman , Jonathan Corbet , Shuah Khan Cc: linux-kernel@vger.kernel.org, linux-api@vger.kernel.org, wine-devel@winehq.org, =?utf-8?q?Andr=C3=A9_Almeida?= , Wolfram Sang , Arkadiusz Hiler , Peter Zijlstra , Andy Lutomirski , linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, Elizabeth Figura Subject: [PATCH 02/31] ntsync: Introduce NTSYNC_IOC_CREATE_SEM. Date: Wed, 14 Feb 2024 17:36:38 -0600 Message-ID: <20240214233645.9273-3-zfigura@codeweavers.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240214233645.9273-1-zfigura@codeweavers.com> References: <20240214233645.9273-1-zfigura@codeweavers.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1790920484250848974 X-GMAIL-MSGID: 1790920484250848974 This corresponds to the NT syscall NtCreateSemaphore(). Semaphores are one of three types of object to be implemented in this driver, the others being mutexes and events. An NT semaphore contains a 32-bit counter, and is signaled and can be acquired when the counter is nonzero. The counter has a maximum value which is specified at creation time. The initial value of the semaphore is also specified at creation time. There are no restrictions on the maximum and initial value. Each object is exposed as an file, to which any number of fds may be opened. When all fds are closed, the object is deleted. Signed-off-by: Elizabeth Figura --- .../userspace-api/ioctl/ioctl-number.rst | 2 + drivers/misc/ntsync.c | 120 ++++++++++++++++++ include/uapi/linux/ntsync.h | 21 +++ 3 files changed, 143 insertions(+) create mode 100644 include/uapi/linux/ntsync.h diff --git a/Documentation/userspace-api/ioctl/ioctl-number.rst b/Documentation/userspace-api/ioctl/ioctl-number.rst index 457e16f06e04..2f5c6994f042 100644 --- a/Documentation/userspace-api/ioctl/ioctl-number.rst +++ b/Documentation/userspace-api/ioctl/ioctl-number.rst @@ -173,6 +173,8 @@ Code Seq# Include File Comments 'M' 00-0F drivers/video/fsl-diu-fb.h conflict! 'N' 00-1F drivers/usb/scanner.h 'N' 40-7F drivers/block/nvme.c +'N' 80-8F uapi/linux/ntsync.h NT synchronization primitives + 'O' 00-06 mtd/ubi-user.h UBI 'P' all linux/soundcard.h conflict! 'P' 60-6F sound/sscape_ioctl.h conflict! diff --git a/drivers/misc/ntsync.c b/drivers/misc/ntsync.c index e4969ef90722..3ad86d98b82d 100644 --- a/drivers/misc/ntsync.c +++ b/drivers/misc/ntsync.c @@ -5,26 +5,146 @@ * Copyright (C) 2024 Elizabeth Figura */ +#include +#include #include #include #include +#include +#include #define NTSYNC_NAME "ntsync" +enum ntsync_type { + NTSYNC_TYPE_SEM, +}; + +struct ntsync_obj { + enum ntsync_type type; + + union { + struct { + __u32 count; + __u32 max; + } sem; + } u; + + struct file *file; + struct ntsync_device *dev; +}; + +struct ntsync_device { + struct file *file; +}; + +static int ntsync_obj_release(struct inode *inode, struct file *file) +{ + struct ntsync_obj *obj = file->private_data; + + fput(obj->dev->file); + kfree(obj); + + return 0; +} + +static const struct file_operations ntsync_obj_fops = { + .owner = THIS_MODULE, + .release = ntsync_obj_release, + .llseek = no_llseek, +}; + +static struct ntsync_obj *ntsync_alloc_obj(struct ntsync_device *dev, + enum ntsync_type type) +{ + struct ntsync_obj *obj; + + obj = kzalloc(sizeof(*obj), GFP_KERNEL); + if (!obj) + return NULL; + obj->type = type; + obj->dev = dev; + get_file(dev->file); + + return obj; +} + +static int ntsync_obj_get_fd(struct ntsync_obj *obj) +{ + struct file *file; + int fd; + + fd = get_unused_fd_flags(O_CLOEXEC); + if (fd < 0) + return fd; + file = anon_inode_getfile("ntsync", &ntsync_obj_fops, obj, O_RDWR); + if (IS_ERR(file)) { + put_unused_fd(fd); + return PTR_ERR(file); + } + obj->file = file; + fd_install(fd, file); + + return fd; +} + +static int ntsync_create_sem(struct ntsync_device *dev, void __user *argp) +{ + struct ntsync_sem_args __user *user_args = argp; + struct ntsync_sem_args args; + struct ntsync_obj *sem; + int fd; + + if (copy_from_user(&args, argp, sizeof(args))) + return -EFAULT; + + if (args.count > args.max) + return -EINVAL; + + sem = ntsync_alloc_obj(dev, NTSYNC_TYPE_SEM); + if (!sem) + return -ENOMEM; + sem->u.sem.count = args.count; + sem->u.sem.max = args.max; + fd = ntsync_obj_get_fd(sem); + if (fd < 0) { + kfree(sem); + return fd; + } + + return put_user(fd, &user_args->sem); +} + static int ntsync_char_open(struct inode *inode, struct file *file) { + struct ntsync_device *dev; + + dev = kzalloc(sizeof(*dev), GFP_KERNEL); + if (!dev) + return -ENOMEM; + + file->private_data = dev; + dev->file = file; return nonseekable_open(inode, file); } static int ntsync_char_release(struct inode *inode, struct file *file) { + struct ntsync_device *dev = file->private_data; + + kfree(dev); + return 0; } static long ntsync_char_ioctl(struct file *file, unsigned int cmd, unsigned long parm) { + struct ntsync_device *dev = file->private_data; + void __user *argp = (void __user *)parm; + switch (cmd) { + case NTSYNC_IOC_CREATE_SEM: + return ntsync_create_sem(dev, argp); default: return -ENOIOCTLCMD; } diff --git a/include/uapi/linux/ntsync.h b/include/uapi/linux/ntsync.h new file mode 100644 index 000000000000..f38818e7759d --- /dev/null +++ b/include/uapi/linux/ntsync.h @@ -0,0 +1,21 @@ +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ +/* + * Kernel support for NT synchronization primitive emulation + * + * Copyright (C) 2021-2022 Elizabeth Figura + */ + +#ifndef __LINUX_NTSYNC_H +#define __LINUX_NTSYNC_H + +#include + +struct ntsync_sem_args { + __u32 sem; + __u32 count; + __u32 max; +}; + +#define NTSYNC_IOC_CREATE_SEM _IOWR('N', 0x80, struct ntsync_sem_args) + +#endif