From mboxrd@z Thu Jan 1 00:00:00 1970 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 9673B5684; Wed, 31 Jan 2024 02:16:03 +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=1706667370; cv=none; b=dNSWOSW9+NSGAG0lHvJTbBGTyuLbQWCmY48BWRnwQQLw6CnL/JmJRQQ1s8yM12+xsX5JfesgBQP/xkJ37eGBMnRzMgQHUBCwzAWKSsPoy7rQg+Hb/iJQ0rSHtXt0fIExpA+CUN1GMQXDmRxKro+JtatNmjd0l/DnxGLVqfwxOl4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706667370; c=relaxed/simple; bh=hMJdmUKFkzno0ji8YpHS/pTDnN+SSVTCS/COoDL60fA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=W0DQoUu4ONfr246CUyFXllTJt55e4jHG+a8Iv8p38D9NlZTEJlVEuRrjacjOyj/J04xW3e47bszp9TO3GbpK6y1/g8Si4Ooj9xzZeBNNhAPVhFqOgtVmCmCTsRyrYmtNZGuCnl7Eivq6ZnbzFKdxBItTCj7Bs4aW9JuydjdPODU= 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=cGd8qBhZ; 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 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=codeweavers.com header.i=@codeweavers.com header.b="cGd8qBhZ" 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=WRk28nnebpEDG8oEow/kRhN8Lt9f1MHcVAwX3iEhD18=; b=cGd8qBhZDagdmZQ+X2glRs5nfU Q5ih2Dm2wM0UtHrDeoXrMVb7Xwsv941ueKGPsMxFzgLUTFBnQHqALtbJDFZJJZAS8dikbRTQIvNj+ zHgd68xeIF8AF9Fke5W8wjGsVf84dCqgFTmRA5k3pm/pJWqeONOi+yQp1vHZheaKDcPTa5WOwCYrb 7FCOFONgURxnnIVkgmHPiTTZR7Xp5/qON9z19WrFdYp6u7K4kM/3zS+sTBt0/8jujstRe/8K37lci EkjToTagxoqBiq0xkJd5vc3iJj5E3IM47k0x0lJE1wZm1VMlPKs3dRbbtrjcT4eb/gwo1dGhQIxME jdiLKuHw==; 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 1rV08o-0038Kv-0N; Tue, 30 Jan 2024 20:15:54 -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=20Almeida?= , Wolfram Sang , Arkadiusz Hiler , Peter Zijlstra , Andy Lutomirski , linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, Elizabeth Figura Subject: [RFC PATCH v2 12/29] ntsync: Introduce NTSYNC_IOC_EVENT_PULSE. Date: Tue, 30 Jan 2024 20:13:39 -0600 Message-ID: <20240131021356.10322-13-zfigura@codeweavers.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240131021356.10322-1-zfigura@codeweavers.com> References: <20240131021356.10322-1-zfigura@codeweavers.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit This corresponds to the NT syscall NtPulseEvent(). This wakes up any waiters as if the event had been set, but does not set the event, instead resetting it if it had been signalled. Thus, for a manual-reset event, all waiters are woken, whereas for an auto-reset event, at most one waiter is woken. Signed-off-by: Elizabeth Figura --- drivers/misc/ntsync.c | 10 ++++++++-- include/uapi/linux/ntsync.h | 1 + 2 files changed, 9 insertions(+), 2 deletions(-) diff --git a/drivers/misc/ntsync.c b/drivers/misc/ntsync.c index 009d927739b8..240ae858fa96 100644 --- a/drivers/misc/ntsync.c +++ b/drivers/misc/ntsync.c @@ -447,7 +447,7 @@ static int ntsync_mutex_kill(struct ntsync_obj *mutex, void __user *argp) return ret; } -static int ntsync_event_set(struct ntsync_obj *event, void __user *argp) +static int ntsync_event_set(struct ntsync_obj *event, void __user *argp, bool pulse) { struct ntsync_device *dev = event->dev; __u32 prev_state; @@ -463,6 +463,8 @@ static int ntsync_event_set(struct ntsync_obj *event, void __user *argp) event->u.event.signaled = true; try_wake_all_obj(dev, event); try_wake_any_event(event); + if (pulse) + event->u.event.signaled = false; spin_unlock(&event->lock); spin_unlock(&dev->wait_all_lock); @@ -472,6 +474,8 @@ static int ntsync_event_set(struct ntsync_obj *event, void __user *argp) prev_state = event->u.event.signaled; event->u.event.signaled = true; try_wake_any_event(event); + if (pulse) + event->u.event.signaled = false; spin_unlock(&event->lock); } @@ -526,9 +530,11 @@ static long ntsync_obj_ioctl(struct file *file, unsigned int cmd, case NTSYNC_IOC_MUTEX_KILL: return ntsync_mutex_kill(obj, argp); case NTSYNC_IOC_EVENT_SET: - return ntsync_event_set(obj, argp); + return ntsync_event_set(obj, argp, false); case NTSYNC_IOC_EVENT_RESET: return ntsync_event_reset(obj, argp); + case NTSYNC_IOC_EVENT_PULSE: + return ntsync_event_set(obj, argp, true); default: return -ENOIOCTLCMD; } diff --git a/include/uapi/linux/ntsync.h b/include/uapi/linux/ntsync.h index f2d7507d8438..598f894f868d 100644 --- a/include/uapi/linux/ntsync.h +++ b/include/uapi/linux/ntsync.h @@ -50,5 +50,6 @@ struct ntsync_wait_args { #define NTSYNC_IOC_MUTEX_KILL _IOW ('N', 0x86, __u32) #define NTSYNC_IOC_EVENT_SET _IOR ('N', 0x88, __u32) #define NTSYNC_IOC_EVENT_RESET _IOR ('N', 0x89, __u32) +#define NTSYNC_IOC_EVENT_PULSE _IOR ('N', 0x8a, __u32) #endif -- 2.43.0