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1 From 8b9efd00727523c56eb9d17ad42338b6090b4b8e Mon Sep 17 00:00:00 2001
2 From: Bharat Bhushan <Bharat.Bhushan@nxp.com>
3 Date: Fri, 12 May 2017 10:27:07 +0530
4 Subject: [PATCH] vfio/fsl-mc: Add VFIO framework skeleton for fsl-mc devices
5
6 This patch adds the infrastructure for VFIO support for fsl-mc
7 devices. Subsequent patches will add support for binding and secure
8 assigning these devices using VFIO.
9
10 FSL-MC is a new bus (driver/bus/fsl-mc/) which is different
11 from PCI and Platform bus.
12
13 Signed-off-by: Bharat Bhushan <Bharat.Bhushan@nxp.com>
14 Signed-off-by: Diana Craciun <diana.craciun@nxp.com>
15 ---
16 drivers/vfio/Kconfig | 1 +
17 drivers/vfio/Makefile | 1 +
18 drivers/vfio/fsl-mc/Kconfig | 9 ++
19 drivers/vfio/fsl-mc/Makefile | 2 +
20 drivers/vfio/fsl-mc/vfio_fsl_mc.c | 162 ++++++++++++++++++++++++++++++
21 drivers/vfio/fsl-mc/vfio_fsl_mc_private.h | 14 +++
22 include/uapi/linux/vfio.h | 1 +
23 7 files changed, 190 insertions(+)
24 create mode 100644 drivers/vfio/fsl-mc/Kconfig
25 create mode 100644 drivers/vfio/fsl-mc/Makefile
26 create mode 100644 drivers/vfio/fsl-mc/vfio_fsl_mc.c
27 create mode 100644 drivers/vfio/fsl-mc/vfio_fsl_mc_private.h
28
29 --- a/drivers/vfio/Kconfig
30 +++ b/drivers/vfio/Kconfig
31 @@ -47,4 +47,5 @@ menuconfig VFIO_NOIOMMU
32 source "drivers/vfio/pci/Kconfig"
33 source "drivers/vfio/platform/Kconfig"
34 source "drivers/vfio/mdev/Kconfig"
35 +source "drivers/vfio/fsl-mc/Kconfig"
36 source "virt/lib/Kconfig"
37 --- a/drivers/vfio/Makefile
38 +++ b/drivers/vfio/Makefile
39 @@ -9,3 +9,4 @@ obj-$(CONFIG_VFIO_SPAPR_EEH) += vfio_spa
40 obj-$(CONFIG_VFIO_PCI) += pci/
41 obj-$(CONFIG_VFIO_PLATFORM) += platform/
42 obj-$(CONFIG_VFIO_MDEV) += mdev/
43 +obj-$(CONFIG_VFIO_FSL_MC) += fsl-mc/
44 --- /dev/null
45 +++ b/drivers/vfio/fsl-mc/Kconfig
46 @@ -0,0 +1,9 @@
47 +config VFIO_FSL_MC
48 + tristate "VFIO support for QorIQ DPAA2 fsl-mc bus devices"
49 + depends on VFIO && FSL_MC_BUS && EVENTFD
50 + help
51 + Driver to enable support for the VFIO QorIQ DPAA2 fsl-mc
52 + (Management Complex) devices. This is required to passthrough
53 + fsl-mc bus devices using the VFIO framework.
54 +
55 + If you don't know what to do here, say N.
56 --- /dev/null
57 +++ b/drivers/vfio/fsl-mc/Makefile
58 @@ -0,0 +1,2 @@
59 +vfio-fsl_mc-y := vfio_fsl_mc.o
60 +obj-$(CONFIG_VFIO_FSL_MC) += vfio_fsl_mc.o
61 --- /dev/null
62 +++ b/drivers/vfio/fsl-mc/vfio_fsl_mc.c
63 @@ -0,0 +1,162 @@
64 +// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
65 +/*
66 + * Copyright 2013-2016 Freescale Semiconductor Inc.
67 + * Copyright 2016-2017,2019 NXP
68 + */
69 +
70 +#include <linux/device.h>
71 +#include <linux/iommu.h>
72 +#include <linux/module.h>
73 +#include <linux/mutex.h>
74 +#include <linux/slab.h>
75 +#include <linux/types.h>
76 +#include <linux/vfio.h>
77 +#include <linux/fsl/mc.h>
78 +
79 +#include "vfio_fsl_mc_private.h"
80 +
81 +
82 +static int vfio_fsl_mc_open(void *device_data)
83 +{
84 + if (!try_module_get(THIS_MODULE))
85 + return -ENODEV;
86 +
87 + return 0;
88 +}
89 +
90 +static void vfio_fsl_mc_release(void *device_data)
91 +{
92 + module_put(THIS_MODULE);
93 +}
94 +
95 +static long vfio_fsl_mc_ioctl(void *device_data, unsigned int cmd,
96 + unsigned long arg)
97 +{
98 + switch (cmd) {
99 + case VFIO_DEVICE_GET_INFO:
100 + {
101 + return -EINVAL;
102 + }
103 + case VFIO_DEVICE_GET_REGION_INFO:
104 + {
105 + return -EINVAL;
106 + }
107 + case VFIO_DEVICE_GET_IRQ_INFO:
108 + {
109 + return -EINVAL;
110 + }
111 + case VFIO_DEVICE_SET_IRQS:
112 + {
113 + return -EINVAL;
114 + }
115 + case VFIO_DEVICE_RESET:
116 + {
117 + return -EINVAL;
118 + }
119 + default:
120 + return -EINVAL;
121 + }
122 +}
123 +
124 +static ssize_t vfio_fsl_mc_read(void *device_data, char __user *buf,
125 + size_t count, loff_t *ppos)
126 +{
127 + return -EINVAL;
128 +}
129 +
130 +static ssize_t vfio_fsl_mc_write(void *device_data, const char __user *buf,
131 + size_t count, loff_t *ppos)
132 +{
133 + return -EINVAL;
134 +}
135 +
136 +static int vfio_fsl_mc_mmap(void *device_data, struct vm_area_struct *vma)
137 +{
138 + return -EINVAL;
139 +}
140 +
141 +static const struct vfio_device_ops vfio_fsl_mc_ops = {
142 + .name = "vfio-fsl-mc",
143 + .open = vfio_fsl_mc_open,
144 + .release = vfio_fsl_mc_release,
145 + .ioctl = vfio_fsl_mc_ioctl,
146 + .read = vfio_fsl_mc_read,
147 + .write = vfio_fsl_mc_write,
148 + .mmap = vfio_fsl_mc_mmap,
149 +};
150 +
151 +static int vfio_fsl_mc_probe(struct fsl_mc_device *mc_dev)
152 +{
153 + struct iommu_group *group;
154 + struct vfio_fsl_mc_device *vdev;
155 + struct device *dev = &mc_dev->dev;
156 + int ret;
157 +
158 + group = vfio_iommu_group_get(dev);
159 + if (!group) {
160 + dev_err(dev, "%s: VFIO: No IOMMU group\n", __func__);
161 + return -EINVAL;
162 + }
163 +
164 + vdev = devm_kzalloc(dev, sizeof(*vdev), GFP_KERNEL);
165 + if (!vdev) {
166 + vfio_iommu_group_put(group, dev);
167 + return -ENOMEM;
168 + }
169 +
170 + vdev->mc_dev = mc_dev;
171 +
172 + ret = vfio_add_group_dev(dev, &vfio_fsl_mc_ops, vdev);
173 + if (ret) {
174 + dev_err(dev, "%s: Failed to add to vfio group\n", __func__);
175 + vfio_iommu_group_put(group, dev);
176 + return ret;
177 + }
178 +
179 + return ret;
180 +}
181 +
182 +static int vfio_fsl_mc_remove(struct fsl_mc_device *mc_dev)
183 +{
184 + struct vfio_fsl_mc_device *vdev;
185 + struct device *dev = &mc_dev->dev;
186 +
187 + vdev = vfio_del_group_dev(dev);
188 + if (!vdev)
189 + return -EINVAL;
190 +
191 + vfio_iommu_group_put(mc_dev->dev.iommu_group, dev);
192 + devm_kfree(dev, vdev);
193 +
194 + return 0;
195 +}
196 +
197 +/*
198 + * vfio-fsl_mc is a meta-driver, so use driver_override interface to
199 + * bind a fsl_mc container with this driver and match_id_table is NULL.
200 + */
201 +static struct fsl_mc_driver vfio_fsl_mc_driver = {
202 + .probe = vfio_fsl_mc_probe,
203 + .remove = vfio_fsl_mc_remove,
204 + .match_id_table = NULL,
205 + .driver = {
206 + .name = "vfio-fsl-mc",
207 + .owner = THIS_MODULE,
208 + },
209 +};
210 +
211 +static int __init vfio_fsl_mc_driver_init(void)
212 +{
213 + return fsl_mc_driver_register(&vfio_fsl_mc_driver);
214 +}
215 +
216 +static void __exit vfio_fsl_mc_driver_exit(void)
217 +{
218 + fsl_mc_driver_unregister(&vfio_fsl_mc_driver);
219 +}
220 +
221 +module_init(vfio_fsl_mc_driver_init);
222 +module_exit(vfio_fsl_mc_driver_exit);
223 +
224 +MODULE_LICENSE("GPL v2");
225 +MODULE_DESCRIPTION("VFIO for FSL-MC devices - User Level meta-driver");
226 --- /dev/null
227 +++ b/drivers/vfio/fsl-mc/vfio_fsl_mc_private.h
228 @@ -0,0 +1,14 @@
229 +/* SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause) */
230 +/*
231 + * Copyright 2013-2016 Freescale Semiconductor Inc.
232 + * Copyright 2016,2019 NXP
233 + */
234 +
235 +#ifndef VFIO_FSL_MC_PRIVATE_H
236 +#define VFIO_FSL_MC_PRIVATE_H
237 +
238 +struct vfio_fsl_mc_device {
239 + struct fsl_mc_device *mc_dev;
240 +};
241 +
242 +#endif /* VFIO_PCI_PRIVATE_H */
243 --- a/include/uapi/linux/vfio.h
244 +++ b/include/uapi/linux/vfio.h
245 @@ -201,6 +201,7 @@ struct vfio_device_info {
246 #define VFIO_DEVICE_FLAGS_AMBA (1 << 3) /* vfio-amba device */
247 #define VFIO_DEVICE_FLAGS_CCW (1 << 4) /* vfio-ccw device */
248 #define VFIO_DEVICE_FLAGS_AP (1 << 5) /* vfio-ap device */
249 +#define VFIO_DEVICE_FLAGS_FSL_MC (1 << 6) /* vfio-fsl-mc device */
250 __u32 num_regions; /* Max region index + 1 */
251 __u32 num_irqs; /* Max IRQ index + 1 */
252 };
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