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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 99729C433FE for ; Thu, 13 Oct 2022 18:34:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232031AbiJMSe1 (ORCPT ); Thu, 13 Oct 2022 14:34:27 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46934 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232033AbiJMSeL (ORCPT ); Thu, 13 Oct 2022 14:34:11 -0400 Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 805A418D444; Thu, 13 Oct 2022 11:30:39 -0700 (PDT) Received: from linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net (linux.microsoft.com [13.77.154.182]) by linux.microsoft.com (Postfix) with ESMTPSA id C70CC20F9E34; Thu, 13 Oct 2022 11:29:18 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com C70CC20F9E34 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1665685758; bh=LEICLpqkAHA55SgqSRkWd7Q239A6x6Ah2FjEDgwjgI4=; h=From:To:Subject:Date:From; b=mTgLYdKdGykhbNSoo5PIyT6nrzCY02AjSwwWN1D+AJWEqOVyWGaSNkSIdS/O1q2QC gcuBfWEL0sd93Q2+qKoJ7Zar+bWhnV1lLfQ7VQn8QvclUX/QrWEj2w6WbQCtVCD+9F guGi4CgEcqPMHiJ17RHKT2JW415rIHwbiYmis5g4= From: Saurabh Sengar To: ssengar@microsoft.com, kys@microsoft.com, haiyangz@microsoft.com, sthemmin@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, longli@microsoft.com, gregkh@linuxfoundation.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, mikelley@microsoft.com Subject: [PATCH] uio_hv_generic: Enable interrupt for low speed VMBus devices Date: Thu, 13 Oct 2022 11:29:14 -0700 Message-Id: <1665685754-13971-1-git-send-email-ssengar@linux.microsoft.com> X-Mailer: git-send-email 1.8.3.1 Precedence: bulk List-ID: X-Mailing-List: linux-hyperv@vger.kernel.org Hyper-V is adding some "specialty" synthetic devices. Instead of writing new kernel-level VMBus drivers for these devices, the devices will be presented to user space via this existing Hyper-V generic UIO driver, so that a user space driver can handle the device. Since these new synthetic devices are low speed devices, they don't support monitor bits and we must use vmbus_setevent() to enable interrupts from the host. Signed-off-by: Saurabh Sengar --- drivers/uio/uio_hv_generic.c | 9 +++------ 1 file changed, 3 insertions(+), 6 deletions(-) diff --git a/drivers/uio/uio_hv_generic.c b/drivers/uio/uio_hv_generic.c index c08a6cfd119f..8e5aa4a1247f 100644 --- a/drivers/uio/uio_hv_generic.c +++ b/drivers/uio/uio_hv_generic.c @@ -84,6 +84,9 @@ hv_uio_irqcontrol(struct uio_info *info, s32 irq_state) dev->channel->inbound.ring_buffer->interrupt_mask = !irq_state; virt_mb(); + if (!dev->channel->offermsg.monitor_allocated && irq_state) + vmbus_setevent(dev->channel); + return 0; } @@ -239,12 +242,6 @@ hv_uio_probe(struct hv_device *dev, void *ring_buffer; int ret; - /* Communicating with host has to be via shared memory not hypercall */ - if (!channel->offermsg.monitor_allocated) { - dev_err(&dev->device, "vmbus channel requires hypercall\n"); - return -ENOTSUPP; - } - pdata = devm_kzalloc(&dev->device, sizeof(*pdata), GFP_KERNEL); if (!pdata) return -ENOMEM; -- 2.34.1