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 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); 102 103 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 } 115 116 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); 130 131 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); 142 143 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