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
amdgpu_xcp_drm_dev_alloc(struct drm_device ** ddev)50 int amdgpu_xcp_drm_dev_alloc(struct drm_device **ddev)
51 {
52 struct platform_device *pdev;
53 struct xcp_device *pxcp_dev;
54 char dev_name[20];
55 int ret;
56
57 if (pdev_num >= MAX_XCP_PLATFORM_DEVICE)
58 return -ENODEV;
59
60 snprintf(dev_name, sizeof(dev_name), "amdgpu_xcp_%d", pdev_num);
61 pdev = platform_device_register_simple(dev_name, -1, NULL, 0);
62 if (IS_ERR(pdev))
63 return PTR_ERR(pdev);
64
65 if (!devres_open_group(&pdev->dev, NULL, GFP_KERNEL)) {
66 ret = -ENOMEM;
67 goto out_unregister;
68 }
69
70 pxcp_dev = devm_drm_dev_alloc(&pdev->dev, &amdgpu_xcp_driver, struct xcp_device, drm);
71 if (IS_ERR(pxcp_dev)) {
72 ret = PTR_ERR(pxcp_dev);
73 goto out_devres;
74 }
75
76 xcp_dev[pdev_num] = pxcp_dev;
77 xcp_dev[pdev_num]->pdev = pdev;
78 *ddev = &pxcp_dev->drm;
79 pdev_num++;
80
81 return 0;
82
83 out_devres:
84 devres_release_group(&pdev->dev, NULL);
85 out_unregister:
86 platform_device_unregister(pdev);
87
88 return ret;
89 }
90 EXPORT_SYMBOL(amdgpu_xcp_drm_dev_alloc);
91
amdgpu_xcp_drv_release(void)92 void amdgpu_xcp_drv_release(void)
93 {
94 for (--pdev_num; pdev_num >= 0; --pdev_num) {
95 struct platform_device *pdev = xcp_dev[pdev_num]->pdev;
96
97 devres_release_group(&pdev->dev, NULL);
98 platform_device_unregister(pdev);
99 xcp_dev[pdev_num] = NULL;
100 }
101 pdev_num = 0;
102 }
103 EXPORT_SYMBOL(amdgpu_xcp_drv_release);
104
amdgpu_xcp_drv_exit(void)105 static void __exit amdgpu_xcp_drv_exit(void)
106 {
107 amdgpu_xcp_drv_release();
108 }
109
110 module_exit(amdgpu_xcp_drv_exit);
111
112 MODULE_AUTHOR("AMD linux driver team");
113 MODULE_DESCRIPTION("AMD XCP PLATFORM DEVICES");
114 MODULE_LICENSE("GPL and additional rights");
115