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2e0d2956 DC |
1 | // SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause) |
2 | /* | |
3 | * Copyright 2013-2016 Freescale Semiconductor Inc. | |
4 | * Copyright 2019 NXP | |
5 | */ | |
6 | ||
7 | #include <linux/vfio.h> | |
8 | #include <linux/slab.h> | |
9 | #include <linux/types.h> | |
10 | #include <linux/eventfd.h> | |
11 | #include <linux/msi.h> | |
12 | ||
13 | #include "linux/fsl/mc.h" | |
14 | #include "vfio_fsl_mc_private.h" | |
15 | ||
cc0ee20b DC |
16 | int vfio_fsl_mc_irqs_allocate(struct vfio_fsl_mc_device *vdev) |
17 | { | |
18 | struct fsl_mc_device *mc_dev = vdev->mc_dev; | |
19 | struct vfio_fsl_mc_irq *mc_irq; | |
20 | int irq_count; | |
21 | int ret, i; | |
22 | ||
23 | /* Device does not support any interrupt */ | |
24 | if (mc_dev->obj_desc.irq_count == 0) | |
25 | return 0; | |
26 | ||
27 | /* interrupts were already allocated for this device */ | |
28 | if (vdev->mc_irqs) | |
29 | return 0; | |
30 | ||
31 | irq_count = mc_dev->obj_desc.irq_count; | |
32 | ||
33 | mc_irq = kcalloc(irq_count, sizeof(*mc_irq), GFP_KERNEL); | |
34 | if (!mc_irq) | |
35 | return -ENOMEM; | |
36 | ||
37 | /* Allocate IRQs */ | |
38 | ret = fsl_mc_allocate_irqs(mc_dev); | |
39 | if (ret) { | |
40 | kfree(mc_irq); | |
41 | return ret; | |
42 | } | |
43 | ||
44 | for (i = 0; i < irq_count; i++) { | |
45 | mc_irq[i].count = 1; | |
46 | mc_irq[i].flags = VFIO_IRQ_INFO_EVENTFD; | |
47 | } | |
48 | ||
49 | vdev->mc_irqs = mc_irq; | |
50 | ||
51 | return 0; | |
52 | } | |
53 | ||
54 | static irqreturn_t vfio_fsl_mc_irq_handler(int irq_num, void *arg) | |
55 | { | |
56 | struct vfio_fsl_mc_irq *mc_irq = (struct vfio_fsl_mc_irq *)arg; | |
57 | ||
58 | eventfd_signal(mc_irq->trigger, 1); | |
59 | return IRQ_HANDLED; | |
60 | } | |
61 | ||
62 | static int vfio_set_trigger(struct vfio_fsl_mc_device *vdev, | |
63 | int index, int fd) | |
64 | { | |
65 | struct vfio_fsl_mc_irq *irq = &vdev->mc_irqs[index]; | |
66 | struct eventfd_ctx *trigger; | |
67 | int hwirq; | |
68 | int ret; | |
69 | ||
70 | hwirq = vdev->mc_dev->irqs[index]->msi_desc->irq; | |
71 | if (irq->trigger) { | |
72 | free_irq(hwirq, irq); | |
73 | kfree(irq->name); | |
74 | eventfd_ctx_put(irq->trigger); | |
75 | irq->trigger = NULL; | |
76 | } | |
77 | ||
78 | if (fd < 0) /* Disable only */ | |
79 | return 0; | |
80 | ||
81 | irq->name = kasprintf(GFP_KERNEL, "vfio-irq[%d](%s)", | |
82 | hwirq, dev_name(&vdev->mc_dev->dev)); | |
83 | if (!irq->name) | |
84 | return -ENOMEM; | |
85 | ||
86 | trigger = eventfd_ctx_fdget(fd); | |
87 | if (IS_ERR(trigger)) { | |
88 | kfree(irq->name); | |
89 | return PTR_ERR(trigger); | |
90 | } | |
91 | ||
92 | irq->trigger = trigger; | |
93 | ||
94 | ret = request_irq(hwirq, vfio_fsl_mc_irq_handler, 0, | |
95 | irq->name, irq); | |
96 | if (ret) { | |
97 | kfree(irq->name); | |
98 | eventfd_ctx_put(trigger); | |
99 | irq->trigger = NULL; | |
100 | return ret; | |
101 | } | |
102 | ||
103 | return 0; | |
104 | } | |
105 | ||
2e0d2956 DC |
106 | static int vfio_fsl_mc_set_irq_trigger(struct vfio_fsl_mc_device *vdev, |
107 | unsigned int index, unsigned int start, | |
108 | unsigned int count, u32 flags, | |
109 | void *data) | |
110 | { | |
cc0ee20b DC |
111 | struct fsl_mc_device *mc_dev = vdev->mc_dev; |
112 | int ret, hwirq; | |
113 | struct vfio_fsl_mc_irq *irq; | |
114 | struct device *cont_dev = fsl_mc_cont_dev(&mc_dev->dev); | |
115 | struct fsl_mc_device *mc_cont = to_fsl_mc_device(cont_dev); | |
116 | ||
117 | if (start != 0 || count != 1) | |
118 | return -EINVAL; | |
119 | ||
120 | mutex_lock(&vdev->reflck->lock); | |
121 | ret = fsl_mc_populate_irq_pool(mc_cont, | |
122 | FSL_MC_IRQ_POOL_MAX_TOTAL_IRQS); | |
123 | if (ret) | |
124 | goto unlock; | |
125 | ||
126 | ret = vfio_fsl_mc_irqs_allocate(vdev); | |
127 | if (ret) | |
128 | goto unlock; | |
129 | mutex_unlock(&vdev->reflck->lock); | |
130 | ||
131 | if (!count && (flags & VFIO_IRQ_SET_DATA_NONE)) | |
132 | return vfio_set_trigger(vdev, index, -1); | |
133 | ||
134 | if (flags & VFIO_IRQ_SET_DATA_EVENTFD) { | |
135 | s32 fd = *(s32 *)data; | |
136 | ||
137 | return vfio_set_trigger(vdev, index, fd); | |
138 | } | |
139 | ||
140 | hwirq = vdev->mc_dev->irqs[index]->msi_desc->irq; | |
141 | ||
142 | irq = &vdev->mc_irqs[index]; | |
143 | ||
144 | if (flags & VFIO_IRQ_SET_DATA_NONE) { | |
145 | vfio_fsl_mc_irq_handler(hwirq, irq); | |
146 | ||
147 | } else if (flags & VFIO_IRQ_SET_DATA_BOOL) { | |
148 | u8 trigger = *(u8 *)data; | |
149 | ||
150 | if (trigger) | |
151 | vfio_fsl_mc_irq_handler(hwirq, irq); | |
152 | } | |
153 | ||
154 | return 0; | |
155 | ||
156 | unlock: | |
157 | mutex_unlock(&vdev->reflck->lock); | |
158 | return ret; | |
159 | ||
2e0d2956 DC |
160 | } |
161 | ||
162 | int vfio_fsl_mc_set_irqs_ioctl(struct vfio_fsl_mc_device *vdev, | |
163 | u32 flags, unsigned int index, | |
164 | unsigned int start, unsigned int count, | |
165 | void *data) | |
166 | { | |
167 | if (flags & VFIO_IRQ_SET_ACTION_TRIGGER) | |
168 | return vfio_fsl_mc_set_irq_trigger(vdev, index, start, | |
169 | count, flags, data); | |
170 | else | |
171 | return -EINVAL; | |
172 | } | |
cc0ee20b DC |
173 | |
174 | /* Free All IRQs for the given MC object */ | |
175 | void vfio_fsl_mc_irqs_cleanup(struct vfio_fsl_mc_device *vdev) | |
176 | { | |
177 | struct fsl_mc_device *mc_dev = vdev->mc_dev; | |
178 | int irq_count = mc_dev->obj_desc.irq_count; | |
179 | int i; | |
180 | ||
181 | /* | |
182 | * Device does not support any interrupt or the interrupts | |
183 | * were not configured | |
184 | */ | |
185 | if (!vdev->mc_irqs) | |
186 | return; | |
187 | ||
188 | for (i = 0; i < irq_count; i++) | |
189 | vfio_set_trigger(vdev, i, -1); | |
190 | ||
191 | fsl_mc_free_irqs(mc_dev); | |
192 | kfree(vdev->mc_irqs); | |
193 | vdev->mc_irqs = NULL; | |
194 | } |