From patchwork Fri May 8 07:20:31 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Diana Madalina Craciun X-Patchwork-Id: 11535799 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 7892292A for ; Fri, 8 May 2020 07:21:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 61FFC20CC7 for ; Fri, 8 May 2020 07:21:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727863AbgEHHVn (ORCPT ); Fri, 8 May 2020 03:21:43 -0400 Received: from inva020.nxp.com ([92.121.34.13]:56692 "EHLO inva020.nxp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726009AbgEHHUr (ORCPT ); Fri, 8 May 2020 03:20:47 -0400 Received: from inva020.nxp.com (localhost [127.0.0.1]) by inva020.eu-rdc02.nxp.com (Postfix) with ESMTP id EE24D1A13FC; Fri, 8 May 2020 09:20:43 +0200 (CEST) Received: from inva024.eu-rdc02.nxp.com (inva024.eu-rdc02.nxp.com [134.27.226.22]) by inva020.eu-rdc02.nxp.com (Postfix) with ESMTP id E0F061A1286; Fri, 8 May 2020 09:20:43 +0200 (CEST) Received: from fsr-ub1864-111.ea.freescale.net (fsr-ub1864-111.ea.freescale.net [10.171.82.141]) by inva024.eu-rdc02.nxp.com (Postfix) with ESMTP id 6137F204BD; Fri, 8 May 2020 09:20:43 +0200 (CEST) From: Diana Craciun To: alex.williamson@redhat.com, kvm@vger.kernel.org Cc: linux-kernel@vger.kernel.org, laurentiu.tudor@nxp.com, bharatb.linux@gmail.com, Bharat Bhushan , Diana Craciun Subject: [PATCH v2 1/9] vfio/fsl-mc: Add VFIO framework skeleton for fsl-mc devices Date: Fri, 8 May 2020 10:20:31 +0300 Message-Id: <20200508072039.18146-2-diana.craciun@oss.nxp.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200508072039.18146-1-diana.craciun@oss.nxp.com> References: <20200508072039.18146-1-diana.craciun@oss.nxp.com> X-Virus-Scanned: ClamAV using ClamSMTP Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org From: Bharat Bhushan DPAA2 (Data Path Acceleration Architecture) consists in mechanisms for processing Ethernet packets, queue management, accelerators, etc. The Management Complex (mc) is a hardware entity that manages the DPAA2 hardware resources. It provides an object-based abstraction for software drivers to use the DPAA2 hardware. The MC mediates operations such as create, discover, destroy of DPAA2 objects. The MC provides memory-mapped I/O command interfaces (MC portals) which DPAA2 software drivers use to operate on DPAA2 objects. A DPRC is a container object that holds other types of DPAA2 objects. Each object in the DPRC is a Linux device and bound to a driver. The MC-bus driver is a platform driver (different from PCI or platform bus). The DPRC driver does runtime management of a bus instance. It performs the initial scan of the DPRC and handles changes in the DPRC configuration (adding/removing objects). All objects inside a container share the same hardware isolation context, meaning that only an entire DPRC can be assigned to a virtual machine. When a container is assigned to a virtual machine, all the objects within that container are assigned to that virtual machine. The DPRC container assigned to the virtual machine is not allowed to change contents (add/remove objects) by the guest. The restriction is set by the host and enforced by the mc hardware. The DPAA2 objects can be directly assigned to the guest. However the MC portals (the memory mapped command interface to the MC) need to be emulated because there are commands that configure the interrupts and the isolation IDs which are virtual in the guest. Example: echo vfio-fsl-mc > /sys/bus/fsl-mc/devices/dprc.2/driver_override echo dprc.2 > /sys/bus/fsl-mc/drivers/vfio-fsl-mc/bind The dprc.2 is bound to the VFIO driver and all the objects within dprc.2 are going to be bound to the VFIO driver. This patch adds the infrastructure for VFIO support for fsl-mc devices. Subsequent patches will add support for binding and secure assigning these devices using VFIO. More details about the DPAA2 objects can be found here: Documentation/networking/device_drivers/freescale/dpaa2/overview.rst Signed-off-by: Bharat Bhushan Signed-off-by: Diana Craciun --- MAINTAINERS | 6 + drivers/vfio/Kconfig | 1 + drivers/vfio/Makefile | 1 + drivers/vfio/fsl-mc/Kconfig | 9 ++ drivers/vfio/fsl-mc/Makefile | 4 + drivers/vfio/fsl-mc/vfio_fsl_mc.c | 160 ++++++++++++++++++++++ drivers/vfio/fsl-mc/vfio_fsl_mc_private.h | 14 ++ include/uapi/linux/vfio.h | 1 + 8 files changed, 196 insertions(+) create mode 100644 drivers/vfio/fsl-mc/Kconfig create mode 100644 drivers/vfio/fsl-mc/Makefile create mode 100644 drivers/vfio/fsl-mc/vfio_fsl_mc.c create mode 100644 drivers/vfio/fsl-mc/vfio_fsl_mc_private.h diff --git a/MAINTAINERS b/MAINTAINERS index 2926327e4976..14cf1f1fb4cd 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -17755,6 +17755,12 @@ F: drivers/vfio/ F: include/linux/vfio.h F: include/uapi/linux/vfio.h +VFIO FSL-MC DRIVER +M: Diana Craciun +L: kvm@vger.kernel.org +S: Maintained +F: drivers/vfio/fsl-mc/ + VFIO MEDIATED DEVICE DRIVERS M: Kirti Wankhede L: kvm@vger.kernel.org diff --git a/drivers/vfio/Kconfig b/drivers/vfio/Kconfig index fd17db9b432f..5533df91b257 100644 --- a/drivers/vfio/Kconfig +++ b/drivers/vfio/Kconfig @@ -47,4 +47,5 @@ menuconfig VFIO_NOIOMMU source "drivers/vfio/pci/Kconfig" source "drivers/vfio/platform/Kconfig" source "drivers/vfio/mdev/Kconfig" +source "drivers/vfio/fsl-mc/Kconfig" source "virt/lib/Kconfig" diff --git a/drivers/vfio/Makefile b/drivers/vfio/Makefile index de67c4725cce..fee73f3d9480 100644 --- a/drivers/vfio/Makefile +++ b/drivers/vfio/Makefile @@ -9,3 +9,4 @@ obj-$(CONFIG_VFIO_SPAPR_EEH) += vfio_spapr_eeh.o obj-$(CONFIG_VFIO_PCI) += pci/ obj-$(CONFIG_VFIO_PLATFORM) += platform/ obj-$(CONFIG_VFIO_MDEV) += mdev/ +obj-$(CONFIG_VFIO_FSL_MC) += fsl-mc/ diff --git a/drivers/vfio/fsl-mc/Kconfig b/drivers/vfio/fsl-mc/Kconfig new file mode 100644 index 000000000000..b1a527d6b6f2 --- /dev/null +++ b/drivers/vfio/fsl-mc/Kconfig @@ -0,0 +1,9 @@ +config VFIO_FSL_MC + tristate "VFIO support for QorIQ DPAA2 fsl-mc bus devices" + depends on VFIO && FSL_MC_BUS && EVENTFD + help + Driver to enable support for the VFIO QorIQ DPAA2 fsl-mc + (Management Complex) devices. This is required to passthrough + fsl-mc bus devices using the VFIO framework. + + If you don't know what to do here, say N. diff --git a/drivers/vfio/fsl-mc/Makefile b/drivers/vfio/fsl-mc/Makefile new file mode 100644 index 000000000000..0c6e5d2ddaae --- /dev/null +++ b/drivers/vfio/fsl-mc/Makefile @@ -0,0 +1,4 @@ +# SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause) + +vfio-fsl-mc-y := vfio_fsl_mc.o +obj-$(CONFIG_VFIO_FSL_MC) += vfio-fsl-mc.o diff --git a/drivers/vfio/fsl-mc/vfio_fsl_mc.c b/drivers/vfio/fsl-mc/vfio_fsl_mc.c new file mode 100644 index 000000000000..8b53c2a25b32 --- /dev/null +++ b/drivers/vfio/fsl-mc/vfio_fsl_mc.c @@ -0,0 +1,160 @@ +// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause) +/* + * Copyright 2013-2016 Freescale Semiconductor Inc. + * Copyright 2016-2017,2019-2020 NXP + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include "vfio_fsl_mc_private.h" + +static int vfio_fsl_mc_open(void *device_data) +{ + if (!try_module_get(THIS_MODULE)) + return -ENODEV; + + return 0; +} + +static void vfio_fsl_mc_release(void *device_data) +{ + module_put(THIS_MODULE); +} + +static long vfio_fsl_mc_ioctl(void *device_data, unsigned int cmd, + unsigned long arg) +{ + switch (cmd) { + case VFIO_DEVICE_GET_INFO: + { + return -ENOTTY; + } + case VFIO_DEVICE_GET_REGION_INFO: + { + return -ENOTTY; + } + case VFIO_DEVICE_GET_IRQ_INFO: + { + return -ENOTTY; + } + case VFIO_DEVICE_SET_IRQS: + { + return -ENOTTY; + } + case VFIO_DEVICE_RESET: + { + return -ENOTTY; + } + default: + return -ENOTTY; + } +} + +static ssize_t vfio_fsl_mc_read(void *device_data, char __user *buf, + size_t count, loff_t *ppos) +{ + return -EINVAL; +} + +static ssize_t vfio_fsl_mc_write(void *device_data, const char __user *buf, + size_t count, loff_t *ppos) +{ + return -EINVAL; +} + +static int vfio_fsl_mc_mmap(void *device_data, struct vm_area_struct *vma) +{ + return -EINVAL; +} + +static const struct vfio_device_ops vfio_fsl_mc_ops = { + .name = "vfio-fsl-mc", + .open = vfio_fsl_mc_open, + .release = vfio_fsl_mc_release, + .ioctl = vfio_fsl_mc_ioctl, + .read = vfio_fsl_mc_read, + .write = vfio_fsl_mc_write, + .mmap = vfio_fsl_mc_mmap, +}; + +static int vfio_fsl_mc_probe(struct fsl_mc_device *mc_dev) +{ + struct iommu_group *group; + struct vfio_fsl_mc_device *vdev; + struct device *dev = &mc_dev->dev; + int ret; + + group = vfio_iommu_group_get(dev); + if (!group) { + dev_err(dev, "%s: VFIO: No IOMMU group\n", __func__); + return -EINVAL; + } + + vdev = devm_kzalloc(dev, sizeof(*vdev), GFP_KERNEL); + if (!vdev) { + vfio_iommu_group_put(group, dev); + return -ENOMEM; + } + + vdev->mc_dev = mc_dev; + + ret = vfio_add_group_dev(dev, &vfio_fsl_mc_ops, vdev); + if (ret) { + dev_err(dev, "%s: Failed to add to vfio group\n", __func__); + vfio_iommu_group_put(group, dev); + return ret; + } + + return ret; +} + +static int vfio_fsl_mc_remove(struct fsl_mc_device *mc_dev) +{ + struct vfio_fsl_mc_device *vdev; + struct device *dev = &mc_dev->dev; + + vdev = vfio_del_group_dev(dev); + if (!vdev) + return -EINVAL; + + vfio_iommu_group_put(mc_dev->dev.iommu_group, dev); + + return 0; +} + +/* + * vfio-fsl_mc is a meta-driver, so use driver_override interface to + * bind a fsl_mc container with this driver and match_id_table is NULL. + */ +static struct fsl_mc_driver vfio_fsl_mc_driver = { + .probe = vfio_fsl_mc_probe, + .remove = vfio_fsl_mc_remove, + .match_id_table = NULL, + .driver = { + .name = "vfio-fsl-mc", + .owner = THIS_MODULE, + }, +}; + +static int __init vfio_fsl_mc_driver_init(void) +{ + return fsl_mc_driver_register(&vfio_fsl_mc_driver); +} + +static void __exit vfio_fsl_mc_driver_exit(void) +{ + fsl_mc_driver_unregister(&vfio_fsl_mc_driver); +} + +module_init(vfio_fsl_mc_driver_init); +module_exit(vfio_fsl_mc_driver_exit); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("VFIO for FSL-MC devices - User Level meta-driver"); diff --git a/drivers/vfio/fsl-mc/vfio_fsl_mc_private.h b/drivers/vfio/fsl-mc/vfio_fsl_mc_private.h new file mode 100644 index 000000000000..e79cc116f6b8 --- /dev/null +++ b/drivers/vfio/fsl-mc/vfio_fsl_mc_private.h @@ -0,0 +1,14 @@ +/* SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause) */ +/* + * Copyright 2013-2016 Freescale Semiconductor Inc. + * Copyright 2016,2019-2020 NXP + */ + +#ifndef VFIO_FSL_MC_PRIVATE_H +#define VFIO_FSL_MC_PRIVATE_H + +struct vfio_fsl_mc_device { + struct fsl_mc_device *mc_dev; +}; + +#endif /* VFIO_FSL_MC_PRIVATE_H */ diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h index 015516bcfaa3..45ee6f64a5a1 100644 --- a/include/uapi/linux/vfio.h +++ b/include/uapi/linux/vfio.h @@ -201,6 +201,7 @@ struct vfio_device_info { #define VFIO_DEVICE_FLAGS_AMBA (1 << 3) /* vfio-amba device */ #define VFIO_DEVICE_FLAGS_CCW (1 << 4) /* vfio-ccw device */ #define VFIO_DEVICE_FLAGS_AP (1 << 5) /* vfio-ap device */ +#define VFIO_DEVICE_FLAGS_FSL_MC (1 << 6) /* vfio-fsl-mc device */ __u32 num_regions; /* Max region index + 1 */ __u32 num_irqs; /* Max IRQ index + 1 */ };