From patchwork Thu Jul 16 11:23:46 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Zhu, Lingshan" X-Patchwork-Id: 11667185 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 3C9CE60D for ; Thu, 16 Jul 2020 11:27:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2C1B2207F9 for ; Thu, 16 Jul 2020 11:27:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728280AbgGPL1z (ORCPT ); Thu, 16 Jul 2020 07:27:55 -0400 Received: from mga02.intel.com ([134.134.136.20]:52601 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728255AbgGPL1x (ORCPT ); Thu, 16 Jul 2020 07:27:53 -0400 IronPort-SDR: Y8xTAenvpDPnKWZ+mXuKokqpDAyFI9JoVm8orpMrl3+4juLTlhiSdxPVcyHXLaMOGIOsHzayec 2IF3DEKlUXOA== X-IronPort-AV: E=McAfee;i="6000,8403,9683"; a="137485055" X-IronPort-AV: E=Sophos;i="5.75,359,1589266800"; d="scan'208";a="137485055" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga005.jf.intel.com ([10.7.209.41]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Jul 2020 04:27:52 -0700 IronPort-SDR: /A56/4sZCfkt0U+dN4M/rUFafwosIzu0HOztA8bu9D5+1fnZtQlENURjrL1jL/7hQeVYOSH6ia h5yPk0oNHGOA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.75,359,1589266800"; d="scan'208";a="460442838" Received: from unknown (HELO localhost.localdomain.bj.intel.com) ([10.240.192.131]) by orsmga005.jf.intel.com with ESMTP; 16 Jul 2020 04:27:50 -0700 From: Zhu Lingshan To: mst@redhat.com, alex.williamson@redhat.com, pbonzini@redhat.com, sean.j.christopherson@intel.com, wanpengli@tencent.com, jasowang@redhat.com Cc: virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, kvm@vger.kernel.org, Zhu Lingshan Subject: [PATCH V2 3/6] vDPA: implement IRQ offloading helpers in vDPA core Date: Thu, 16 Jul 2020 19:23:46 +0800 Message-Id: <1594898629-18790-4-git-send-email-lingshan.zhu@intel.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1594898629-18790-1-git-send-email-lingshan.zhu@intel.com> References: <1594898629-18790-1-git-send-email-lingshan.zhu@intel.com> Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org This commit implements IRQ offloading helpers in vDPA core by introducing two couple of functions: vdpa_alloc_vq_irq() and vdpa_free_vq_irq(): request irq and free irq, will setup irq offloading. vdpa_setup_irq() and vdpa_unsetup_irq(): supportive functions, will call vhost_vdpa helpers. Signed-off-by: Zhu Lingshan Suggested-by: Jason Wang --- drivers/vdpa/vdpa.c | 42 ++++++++++++++++++++++++++++++++++++++++++ include/linux/vdpa.h | 13 +++++++++++++ 2 files changed, 55 insertions(+) diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c index ff6562f..cce4d91 100644 --- a/drivers/vdpa/vdpa.c +++ b/drivers/vdpa/vdpa.c @@ -163,6 +163,48 @@ void vdpa_unregister_driver(struct vdpa_driver *drv) } EXPORT_SYMBOL_GPL(vdpa_unregister_driver); +static void vdpa_setup_irq(struct vdpa_device *vdev, int qid, int irq) +{ + struct vdpa_driver *drv = drv_to_vdpa(vdev->dev.driver); + + if (drv->setup_vq_irq) + drv->setup_vq_irq(vdev, qid, irq); +} + +static void vdpa_unsetup_irq(struct vdpa_device *vdev, int qid) +{ + struct vdpa_driver *drv = drv_to_vdpa(vdev->dev.driver); + + if (drv->unsetup_vq_irq) + drv->unsetup_vq_irq(vdev, qid); +} + +int vdpa_alloc_vq_irq(struct device *dev, struct vdpa_device *vdev, + unsigned int irq, irq_handler_t handler, + unsigned long irqflags, const char *devname, void *dev_id, + int qid) +{ + int ret; + + ret = devm_request_irq(dev, irq, handler, irqflags, devname, dev_id); + if (ret) + dev_err(dev, "Failed to request irq for vq %d\n", qid); + else + vdpa_setup_irq(vdev, qid, irq); + + return ret; + +} +EXPORT_SYMBOL_GPL(vdpa_alloc_vq_irq); + +void vdpa_free_vq_irq(struct device *dev, struct vdpa_device *vdev, int irq, + int qid, void *dev_id) +{ + devm_free_irq(dev, irq, dev_id); + vdpa_unsetup_irq(vdev, qid); +} +EXPORT_SYMBOL_GPL(vdpa_free_vq_irq); + static int vdpa_init(void) { return bus_register(&vdpa_bus); diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h index 239db79..7d64d83 100644 --- a/include/linux/vdpa.h +++ b/include/linux/vdpa.h @@ -220,17 +220,30 @@ struct vdpa_device *__vdpa_alloc_device(struct device *parent, int vdpa_register_device(struct vdpa_device *vdev); void vdpa_unregister_device(struct vdpa_device *vdev); +/* request irq for a vq, setup irq offloading if its a vhost_vdpa vq */ +int vdpa_alloc_vq_irq(struct device *dev, struct vdpa_device *vdev, + unsigned int irq, irq_handler_t handler, + unsigned long irqflags, const char *devname, void *dev_id, + int qid); +/* free irq for a vq, unsetup irq offloading if its a vhost_vdpa vq */ +void vdpa_free_vq_irq(struct device *dev, struct vdpa_device *vdev, int irq, + int qid, void *dev_id); + /** * vdpa_driver - operations for a vDPA driver * @driver: underlying device driver * @probe: the function to call when a device is found. Returns 0 or -errno. * @remove: the function to call when a device is removed. + * @setup_vq_irq: setup irq offloading for a vhost_vdpa vq. + * @unsetup_vq_irq: unsetup offloading for a vhost_vdpa vq. */ struct vdpa_driver { struct device_driver driver; int (*probe)(struct vdpa_device *vdev); void (*remove)(struct vdpa_device *vdev); + void (*setup_vq_irq)(struct vdpa_device *vdev, int qid, int irq); + void (*unsetup_vq_irq)(struct vdpa_device *vdev, int qid); }; #define vdpa_register_driver(drv) \