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95096f2f SH |
1 | /* |
2 | * uio_hv_generic - generic UIO driver for VMBus | |
3 | * | |
4 | * Copyright (c) 2013-2016 Brocade Communications Systems, Inc. | |
5 | * Copyright (c) 2016, Microsoft Corporation. | |
6 | * | |
7 | * | |
8 | * This work is licensed under the terms of the GNU GPL, version 2. | |
9 | * | |
10 | * Since the driver does not declare any device ids, you must allocate | |
11 | * id and bind the device to the driver yourself. For example: | |
12 | * | |
13 | * # echo "f8615163-df3e-46c5-913f-f2d2f965ed0e" \ | |
14 | * > /sys/bus/vmbus/drivers/uio_hv_generic | |
15 | * # echo -n vmbus-ed963694-e847-4b2a-85af-bc9cfc11d6f3 \ | |
16 | * > /sys/bus/vmbus/drivers/hv_netvsc/unbind | |
17 | * # echo -n vmbus-ed963694-e847-4b2a-85af-bc9cfc11d6f3 \ | |
18 | * > /sys/bus/vmbus/drivers/uio_hv_generic/bind | |
19 | */ | |
20 | ||
21 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
22 | ||
23 | #include <linux/device.h> | |
24 | #include <linux/kernel.h> | |
25 | #include <linux/module.h> | |
26 | #include <linux/uio_driver.h> | |
27 | #include <linux/netdevice.h> | |
28 | #include <linux/if_ether.h> | |
29 | #include <linux/skbuff.h> | |
30 | #include <linux/hyperv.h> | |
31 | #include <linux/vmalloc.h> | |
32 | #include <linux/slab.h> | |
33 | ||
34 | #include "../hv/hyperv_vmbus.h" | |
35 | ||
36 | #define DRIVER_VERSION "0.02.0" | |
37 | #define DRIVER_AUTHOR "Stephen Hemminger <sthemmin at microsoft.com>" | |
38 | #define DRIVER_DESC "Generic UIO driver for VMBus devices" | |
39 | ||
40 | /* | |
41 | * List of resources to be mapped to user space | |
42 | * can be extended up to MAX_UIO_MAPS(5) items | |
43 | */ | |
44 | enum hv_uio_map { | |
45 | TXRX_RING_MAP = 0, | |
46 | INT_PAGE_MAP, | |
47 | MON_PAGE_MAP, | |
48 | }; | |
49 | ||
50 | #define HV_RING_SIZE 512 | |
51 | ||
52 | struct hv_uio_private_data { | |
53 | struct uio_info info; | |
54 | struct hv_device *device; | |
55 | }; | |
56 | ||
57 | static int | |
58 | hv_uio_mmap(struct uio_info *info, struct vm_area_struct *vma) | |
59 | { | |
60 | int mi; | |
61 | ||
62 | if (vma->vm_pgoff >= MAX_UIO_MAPS) | |
63 | return -EINVAL; | |
64 | ||
65 | if (info->mem[vma->vm_pgoff].size == 0) | |
66 | return -EINVAL; | |
67 | ||
68 | mi = (int)vma->vm_pgoff; | |
69 | ||
70 | return remap_pfn_range(vma, vma->vm_start, | |
190cc65e | 71 | info->mem[mi].addr >> PAGE_SHIFT, |
95096f2f SH |
72 | vma->vm_end - vma->vm_start, vma->vm_page_prot); |
73 | } | |
74 | ||
75 | /* | |
76 | * This is the irqcontrol callback to be registered to uio_info. | |
77 | * It can be used to disable/enable interrupt from user space processes. | |
78 | * | |
79 | * @param info | |
80 | * pointer to uio_info. | |
81 | * @param irq_state | |
82 | * state value. 1 to enable interrupt, 0 to disable interrupt. | |
83 | */ | |
84 | static int | |
85 | hv_uio_irqcontrol(struct uio_info *info, s32 irq_state) | |
86 | { | |
87 | struct hv_uio_private_data *pdata = info->priv; | |
88 | struct hv_device *dev = pdata->device; | |
89 | ||
90 | dev->channel->inbound.ring_buffer->interrupt_mask = !irq_state; | |
91 | virt_mb(); | |
92 | ||
93 | return 0; | |
94 | } | |
95 | ||
96 | /* | |
97 | * Callback from vmbus_event when something is in inbound ring. | |
98 | */ | |
99 | static void hv_uio_channel_cb(void *context) | |
100 | { | |
101 | struct hv_uio_private_data *pdata = context; | |
102 | struct hv_device *dev = pdata->device; | |
103 | ||
104 | dev->channel->inbound.ring_buffer->interrupt_mask = 1; | |
105 | virt_mb(); | |
106 | ||
107 | uio_event_notify(&pdata->info); | |
108 | } | |
109 | ||
110 | static int | |
111 | hv_uio_probe(struct hv_device *dev, | |
112 | const struct hv_vmbus_device_id *dev_id) | |
113 | { | |
114 | struct hv_uio_private_data *pdata; | |
115 | int ret; | |
116 | ||
117 | pdata = kzalloc(sizeof(*pdata), GFP_KERNEL); | |
118 | if (!pdata) | |
119 | return -ENOMEM; | |
120 | ||
121 | ret = vmbus_open(dev->channel, HV_RING_SIZE * PAGE_SIZE, | |
122 | HV_RING_SIZE * PAGE_SIZE, NULL, 0, | |
123 | hv_uio_channel_cb, pdata); | |
124 | if (ret) | |
125 | goto fail; | |
126 | ||
d7445742 SH |
127 | /* Communicating with host has to be via shared memory not hypercall */ |
128 | if (!dev->channel->offermsg.monitor_allocated) { | |
129 | dev_err(&dev->device, "vmbus channel requires hypercall\n"); | |
130 | ret = -ENOTSUPP; | |
131 | goto fail_close; | |
132 | } | |
133 | ||
95096f2f | 134 | dev->channel->inbound.ring_buffer->interrupt_mask = 1; |
b71e3282 | 135 | set_channel_read_mode(dev->channel, HV_CALL_DIRECT); |
95096f2f SH |
136 | |
137 | /* Fill general uio info */ | |
138 | pdata->info.name = "uio_hv_generic"; | |
139 | pdata->info.version = DRIVER_VERSION; | |
140 | pdata->info.irqcontrol = hv_uio_irqcontrol; | |
141 | pdata->info.mmap = hv_uio_mmap; | |
142 | pdata->info.irq = UIO_IRQ_CUSTOM; | |
143 | ||
144 | /* mem resources */ | |
145 | pdata->info.mem[TXRX_RING_MAP].name = "txrx_rings"; | |
146 | pdata->info.mem[TXRX_RING_MAP].addr | |
190cc65e | 147 | = virt_to_phys(dev->channel->ringbuffer_pages); |
95096f2f SH |
148 | pdata->info.mem[TXRX_RING_MAP].size |
149 | = dev->channel->ringbuffer_pagecount * PAGE_SIZE; | |
150 | pdata->info.mem[TXRX_RING_MAP].memtype = UIO_MEM_LOGICAL; | |
151 | ||
152 | pdata->info.mem[INT_PAGE_MAP].name = "int_page"; | |
153 | pdata->info.mem[INT_PAGE_MAP].addr = | |
190cc65e | 154 | virt_to_phys(vmbus_connection.int_page); |
95096f2f SH |
155 | pdata->info.mem[INT_PAGE_MAP].size = PAGE_SIZE; |
156 | pdata->info.mem[INT_PAGE_MAP].memtype = UIO_MEM_LOGICAL; | |
157 | ||
158 | pdata->info.mem[MON_PAGE_MAP].name = "monitor_pages"; | |
159 | pdata->info.mem[MON_PAGE_MAP].addr = | |
190cc65e | 160 | virt_to_phys(vmbus_connection.monitor_pages[1]); |
95096f2f SH |
161 | pdata->info.mem[MON_PAGE_MAP].size = PAGE_SIZE; |
162 | pdata->info.mem[MON_PAGE_MAP].memtype = UIO_MEM_LOGICAL; | |
163 | ||
164 | pdata->info.priv = pdata; | |
165 | pdata->device = dev; | |
166 | ||
167 | ret = uio_register_device(&dev->device, &pdata->info); | |
168 | if (ret) { | |
169 | dev_err(&dev->device, "hv_uio register failed\n"); | |
170 | goto fail_close; | |
171 | } | |
172 | ||
173 | hv_set_drvdata(dev, pdata); | |
174 | ||
175 | return 0; | |
176 | ||
177 | fail_close: | |
178 | vmbus_close(dev->channel); | |
179 | fail: | |
180 | kfree(pdata); | |
181 | ||
182 | return ret; | |
183 | } | |
184 | ||
185 | static int | |
186 | hv_uio_remove(struct hv_device *dev) | |
187 | { | |
188 | struct hv_uio_private_data *pdata = hv_get_drvdata(dev); | |
189 | ||
190 | if (!pdata) | |
191 | return 0; | |
192 | ||
193 | uio_unregister_device(&pdata->info); | |
194 | hv_set_drvdata(dev, NULL); | |
195 | vmbus_close(dev->channel); | |
196 | kfree(pdata); | |
197 | return 0; | |
198 | } | |
199 | ||
200 | static struct hv_driver hv_uio_drv = { | |
201 | .name = "uio_hv_generic", | |
202 | .id_table = NULL, /* only dynamic id's */ | |
203 | .probe = hv_uio_probe, | |
204 | .remove = hv_uio_remove, | |
205 | }; | |
206 | ||
207 | static int __init | |
208 | hyperv_module_init(void) | |
209 | { | |
210 | return vmbus_driver_register(&hv_uio_drv); | |
211 | } | |
212 | ||
213 | static void __exit | |
214 | hyperv_module_exit(void) | |
215 | { | |
216 | vmbus_driver_unregister(&hv_uio_drv); | |
217 | } | |
218 | ||
219 | module_init(hyperv_module_init); | |
220 | module_exit(hyperv_module_exit); | |
221 | ||
222 | MODULE_VERSION(DRIVER_VERSION); | |
223 | MODULE_LICENSE("GPL v2"); | |
224 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
225 | MODULE_DESCRIPTION(DRIVER_DESC); |