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253 lines
6.6 KiB
Diff
253 lines
6.6 KiB
Diff
From 8b9efd00727523c56eb9d17ad42338b6090b4b8e Mon Sep 17 00:00:00 2001
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From: Bharat Bhushan <Bharat.Bhushan@nxp.com>
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Date: Fri, 12 May 2017 10:27:07 +0530
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Subject: [PATCH] vfio/fsl-mc: Add VFIO framework skeleton for fsl-mc devices
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This patch adds the infrastructure for VFIO support for fsl-mc
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devices. Subsequent patches will add support for binding and secure
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assigning these devices using VFIO.
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FSL-MC is a new bus (driver/bus/fsl-mc/) which is different
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from PCI and Platform bus.
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Signed-off-by: Bharat Bhushan <Bharat.Bhushan@nxp.com>
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Signed-off-by: Diana Craciun <diana.craciun@nxp.com>
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---
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drivers/vfio/Kconfig | 1 +
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drivers/vfio/Makefile | 1 +
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drivers/vfio/fsl-mc/Kconfig | 9 ++
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drivers/vfio/fsl-mc/Makefile | 2 +
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drivers/vfio/fsl-mc/vfio_fsl_mc.c | 162 ++++++++++++++++++++++++++++++
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drivers/vfio/fsl-mc/vfio_fsl_mc_private.h | 14 +++
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include/uapi/linux/vfio.h | 1 +
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7 files changed, 190 insertions(+)
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create mode 100644 drivers/vfio/fsl-mc/Kconfig
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create mode 100644 drivers/vfio/fsl-mc/Makefile
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create mode 100644 drivers/vfio/fsl-mc/vfio_fsl_mc.c
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create mode 100644 drivers/vfio/fsl-mc/vfio_fsl_mc_private.h
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--- a/drivers/vfio/Kconfig
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+++ b/drivers/vfio/Kconfig
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@@ -47,4 +47,5 @@ menuconfig VFIO_NOIOMMU
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source "drivers/vfio/pci/Kconfig"
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source "drivers/vfio/platform/Kconfig"
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source "drivers/vfio/mdev/Kconfig"
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+source "drivers/vfio/fsl-mc/Kconfig"
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source "virt/lib/Kconfig"
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--- a/drivers/vfio/Makefile
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+++ b/drivers/vfio/Makefile
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@@ -9,3 +9,4 @@ obj-$(CONFIG_VFIO_SPAPR_EEH) += vfio_spa
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obj-$(CONFIG_VFIO_PCI) += pci/
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obj-$(CONFIG_VFIO_PLATFORM) += platform/
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obj-$(CONFIG_VFIO_MDEV) += mdev/
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+obj-$(CONFIG_VFIO_FSL_MC) += fsl-mc/
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--- /dev/null
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+++ b/drivers/vfio/fsl-mc/Kconfig
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@@ -0,0 +1,9 @@
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+config VFIO_FSL_MC
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+ tristate "VFIO support for QorIQ DPAA2 fsl-mc bus devices"
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+ depends on VFIO && FSL_MC_BUS && EVENTFD
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+ help
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+ Driver to enable support for the VFIO QorIQ DPAA2 fsl-mc
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+ (Management Complex) devices. This is required to passthrough
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+ fsl-mc bus devices using the VFIO framework.
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+
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+ If you don't know what to do here, say N.
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--- /dev/null
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+++ b/drivers/vfio/fsl-mc/Makefile
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@@ -0,0 +1,2 @@
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+vfio-fsl_mc-y := vfio_fsl_mc.o
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+obj-$(CONFIG_VFIO_FSL_MC) += vfio_fsl_mc.o
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--- /dev/null
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+++ b/drivers/vfio/fsl-mc/vfio_fsl_mc.c
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@@ -0,0 +1,162 @@
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+// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
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+/*
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+ * Copyright 2013-2016 Freescale Semiconductor Inc.
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+ * Copyright 2016-2017,2019 NXP
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+ */
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+
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+#include <linux/device.h>
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+#include <linux/iommu.h>
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+#include <linux/module.h>
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+#include <linux/mutex.h>
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+#include <linux/slab.h>
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+#include <linux/types.h>
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+#include <linux/vfio.h>
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+#include <linux/fsl/mc.h>
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+
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+#include "vfio_fsl_mc_private.h"
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+
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+
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+static int vfio_fsl_mc_open(void *device_data)
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+{
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+ if (!try_module_get(THIS_MODULE))
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+ return -ENODEV;
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+
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+ return 0;
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+}
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+
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+static void vfio_fsl_mc_release(void *device_data)
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+{
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+ module_put(THIS_MODULE);
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+}
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+
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+static long vfio_fsl_mc_ioctl(void *device_data, unsigned int cmd,
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+ unsigned long arg)
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+{
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+ switch (cmd) {
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+ case VFIO_DEVICE_GET_INFO:
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+ {
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+ return -EINVAL;
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+ }
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+ case VFIO_DEVICE_GET_REGION_INFO:
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+ {
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+ return -EINVAL;
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+ }
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+ case VFIO_DEVICE_GET_IRQ_INFO:
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+ {
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+ return -EINVAL;
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+ }
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+ case VFIO_DEVICE_SET_IRQS:
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+ {
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+ return -EINVAL;
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+ }
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+ case VFIO_DEVICE_RESET:
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+ {
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+ return -EINVAL;
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+ }
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+ default:
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+ return -EINVAL;
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+ }
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+}
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+
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+static ssize_t vfio_fsl_mc_read(void *device_data, char __user *buf,
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+ size_t count, loff_t *ppos)
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+{
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+ return -EINVAL;
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+}
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+
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+static ssize_t vfio_fsl_mc_write(void *device_data, const char __user *buf,
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+ size_t count, loff_t *ppos)
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+{
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+ return -EINVAL;
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+}
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+
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+static int vfio_fsl_mc_mmap(void *device_data, struct vm_area_struct *vma)
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+{
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+ return -EINVAL;
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+}
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+
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+static const struct vfio_device_ops vfio_fsl_mc_ops = {
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+ .name = "vfio-fsl-mc",
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+ .open = vfio_fsl_mc_open,
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+ .release = vfio_fsl_mc_release,
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+ .ioctl = vfio_fsl_mc_ioctl,
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+ .read = vfio_fsl_mc_read,
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+ .write = vfio_fsl_mc_write,
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+ .mmap = vfio_fsl_mc_mmap,
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+};
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+
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+static int vfio_fsl_mc_probe(struct fsl_mc_device *mc_dev)
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+{
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+ struct iommu_group *group;
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+ struct vfio_fsl_mc_device *vdev;
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+ struct device *dev = &mc_dev->dev;
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+ int ret;
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+
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+ group = vfio_iommu_group_get(dev);
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+ if (!group) {
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+ dev_err(dev, "%s: VFIO: No IOMMU group\n", __func__);
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+ return -EINVAL;
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+ }
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+
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+ vdev = devm_kzalloc(dev, sizeof(*vdev), GFP_KERNEL);
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+ if (!vdev) {
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+ vfio_iommu_group_put(group, dev);
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+ return -ENOMEM;
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+ }
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+
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+ vdev->mc_dev = mc_dev;
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+
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+ ret = vfio_add_group_dev(dev, &vfio_fsl_mc_ops, vdev);
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+ if (ret) {
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+ dev_err(dev, "%s: Failed to add to vfio group\n", __func__);
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+ vfio_iommu_group_put(group, dev);
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+ return ret;
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+ }
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+
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+ return ret;
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+}
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+
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+static int vfio_fsl_mc_remove(struct fsl_mc_device *mc_dev)
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+{
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+ struct vfio_fsl_mc_device *vdev;
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+ struct device *dev = &mc_dev->dev;
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+
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+ vdev = vfio_del_group_dev(dev);
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+ if (!vdev)
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+ return -EINVAL;
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+
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+ vfio_iommu_group_put(mc_dev->dev.iommu_group, dev);
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+ devm_kfree(dev, vdev);
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+
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+ return 0;
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+}
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+
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+/*
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+ * vfio-fsl_mc is a meta-driver, so use driver_override interface to
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+ * bind a fsl_mc container with this driver and match_id_table is NULL.
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+ */
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+static struct fsl_mc_driver vfio_fsl_mc_driver = {
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+ .probe = vfio_fsl_mc_probe,
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+ .remove = vfio_fsl_mc_remove,
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+ .match_id_table = NULL,
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+ .driver = {
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+ .name = "vfio-fsl-mc",
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+ .owner = THIS_MODULE,
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+ },
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+};
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+
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+static int __init vfio_fsl_mc_driver_init(void)
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+{
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+ return fsl_mc_driver_register(&vfio_fsl_mc_driver);
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+}
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+
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+static void __exit vfio_fsl_mc_driver_exit(void)
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+{
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+ fsl_mc_driver_unregister(&vfio_fsl_mc_driver);
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+}
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+
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+module_init(vfio_fsl_mc_driver_init);
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+module_exit(vfio_fsl_mc_driver_exit);
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+
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+MODULE_LICENSE("GPL v2");
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+MODULE_DESCRIPTION("VFIO for FSL-MC devices - User Level meta-driver");
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--- /dev/null
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+++ b/drivers/vfio/fsl-mc/vfio_fsl_mc_private.h
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@@ -0,0 +1,14 @@
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+/* SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause) */
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+/*
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+ * Copyright 2013-2016 Freescale Semiconductor Inc.
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+ * Copyright 2016,2019 NXP
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+ */
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+
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+#ifndef VFIO_FSL_MC_PRIVATE_H
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+#define VFIO_FSL_MC_PRIVATE_H
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+
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+struct vfio_fsl_mc_device {
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+ struct fsl_mc_device *mc_dev;
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+};
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+
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+#endif /* VFIO_PCI_PRIVATE_H */
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--- a/include/uapi/linux/vfio.h
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+++ b/include/uapi/linux/vfio.h
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@@ -201,6 +201,7 @@ struct vfio_device_info {
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#define VFIO_DEVICE_FLAGS_AMBA (1 << 3) /* vfio-amba device */
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#define VFIO_DEVICE_FLAGS_CCW (1 << 4) /* vfio-ccw device */
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#define VFIO_DEVICE_FLAGS_AP (1 << 5) /* vfio-ap device */
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+#define VFIO_DEVICE_FLAGS_FSL_MC (1 << 6) /* vfio-fsl-mc device */
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__u32 num_regions; /* Max region index + 1 */
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__u32 num_irqs; /* Max IRQ index + 1 */
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};
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