1 /*
2 * Copyright 2023 Advanced Micro Devices, Inc.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
21 *
22 */
23
24 #include <linux/export.h>
25 #include <linux/init.h>
26 #include <linux/module.h>
27 #include <linux/platform_device.h>
28
29 #include <drm/drm_drv.h>
30
31 #include "amdgpu_xcp_drv.h"
32
33 #define MAX_XCP_PLATFORM_DEVICE 64
34
35 struct xcp_device {
36 struct drm_device drm;
37 struct platform_device *pdev;
38 };
39
40 static const struct drm_driver amdgpu_xcp_driver = {
41 .driver_features = DRIVER_GEM | DRIVER_RENDER,
42 .name = "amdgpu_xcp_drv",
43 .major = 1,
44 .minor = 0,
45 };
46
47 static int8_t pdev_num;
48 static struct xcp_device *xcp_dev[MAX_XCP_PLATFORM_DEVICE];
49 static DEFINE_MUTEX(xcp_mutex);
50
amdgpu_xcp_drm_dev_alloc(struct drm_device ** ddev)51 int amdgpu_xcp_drm_dev_alloc(struct drm_device **ddev)
52 {
53 struct platform_device *pdev;
54 struct xcp_device *pxcp_dev;
55 char dev_name[20];
56 int ret, i;
57
58 guard(mutex)(&xcp_mutex);
59
60 if (pdev_num >= MAX_XCP_PLATFORM_DEVICE)
61 return -ENODEV;
62
63 for (i = 0; i < MAX_XCP_PLATFORM_DEVICE; i++) {
64 if (!xcp_dev[i])
65 break;
66 }
67
68 if (i >= MAX_XCP_PLATFORM_DEVICE)
69 return -ENODEV;
70
71 snprintf(dev_name, sizeof(dev_name), "amdgpu_xcp_%d", i);
72 pdev = platform_device_register_simple(dev_name, -1, NULL, 0);
73 if (IS_ERR(pdev))
74 return PTR_ERR(pdev);
75
76 if (!devres_open_group(&pdev->dev, NULL, GFP_KERNEL)) {
77 ret = -ENOMEM;
78 goto out_unregister;
79 }
80
81 pxcp_dev = devm_drm_dev_alloc(&pdev->dev, &amdgpu_xcp_driver, struct xcp_device, drm);
82 if (IS_ERR(pxcp_dev)) {
83 ret = PTR_ERR(pxcp_dev);
84 goto out_devres;
85 }
86
87 xcp_dev[i] = pxcp_dev;
88 xcp_dev[i]->pdev = pdev;
89 *ddev = &pxcp_dev->drm;
90 pdev_num++;
91
92 return 0;
93
94 out_devres:
95 devres_release_group(&pdev->dev, NULL);
96 out_unregister:
97 platform_device_unregister(pdev);
98
99 return ret;
100 }
101 EXPORT_SYMBOL(amdgpu_xcp_drm_dev_alloc);
102
free_xcp_dev(int8_t index)103 static void free_xcp_dev(int8_t index)
104 {
105 if ((index < MAX_XCP_PLATFORM_DEVICE) && (xcp_dev[index])) {
106 struct platform_device *pdev = xcp_dev[index]->pdev;
107
108 devres_release_group(&pdev->dev, NULL);
109 platform_device_unregister(pdev);
110
111 xcp_dev[index] = NULL;
112 pdev_num--;
113 }
114 }
115
amdgpu_xcp_drm_dev_free(struct drm_device * ddev)116 void amdgpu_xcp_drm_dev_free(struct drm_device *ddev)
117 {
118 int8_t i;
119
120 guard(mutex)(&xcp_mutex);
121
122 for (i = 0; i < MAX_XCP_PLATFORM_DEVICE; i++) {
123 if ((xcp_dev[i]) && (&xcp_dev[i]->drm == ddev)) {
124 free_xcp_dev(i);
125 break;
126 }
127 }
128 }
129 EXPORT_SYMBOL(amdgpu_xcp_drm_dev_free);
130
amdgpu_xcp_drv_release(void)131 void amdgpu_xcp_drv_release(void)
132 {
133 int8_t i;
134
135 guard(mutex)(&xcp_mutex);
136
137 for (i = 0; pdev_num && i < MAX_XCP_PLATFORM_DEVICE; i++) {
138 free_xcp_dev(i);
139 }
140 }
141 EXPORT_SYMBOL(amdgpu_xcp_drv_release);
142
amdgpu_xcp_drv_exit(void)143 static void __exit amdgpu_xcp_drv_exit(void)
144 {
145 amdgpu_xcp_drv_release();
146 }
147
148 module_exit(amdgpu_xcp_drv_exit);
149
150 MODULE_AUTHOR("AMD linux driver team");
151 MODULE_DESCRIPTION("AMD XCP PLATFORM DEVICES");
152 MODULE_LICENSE("GPL and additional rights");
153