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 #include <linux/slab.h> 29 30 #include <drm/drm_drv.h> 31 32 #include "amdgpu_xcp_drv.h" 33 34 #define MAX_XCP_PLATFORM_DEVICE 64 35 36 struct xcp_device { 37 struct drm_device drm; 38 struct platform_device *pdev; 39 }; 40 41 static const struct drm_driver amdgpu_xcp_driver = { 42 .driver_features = DRIVER_GEM | DRIVER_RENDER, 43 .name = "amdgpu_xcp_drv", 44 .major = 1, 45 .minor = 0, 46 }; 47 48 static u8 pdev_num; 49 static struct xcp_device *xcp_dev[MAX_XCP_PLATFORM_DEVICE]; 50 static DEFINE_MUTEX(xcp_mutex); 51 52 int amdgpu_xcp_drm_dev_alloc(struct drm_device **ddev) 53 { 54 struct platform_device *pdev; 55 struct xcp_device *pxcp_dev; 56 char *dev_name; 57 int ret, i; 58 59 if (!ddev) 60 return -EINVAL; 61 62 BUILD_BUG_ON(MAX_XCP_PLATFORM_DEVICE >= U8_MAX); 63 64 guard(mutex)(&xcp_mutex); 65 66 if (pdev_num >= MAX_XCP_PLATFORM_DEVICE) 67 return -ENODEV; 68 69 for (i = 0; i < MAX_XCP_PLATFORM_DEVICE; i++) { 70 if (!xcp_dev[i]) 71 break; 72 } 73 74 if (i >= MAX_XCP_PLATFORM_DEVICE) 75 return -ENODEV; 76 77 dev_name = kasprintf(GFP_KERNEL, "amdgpu_xcp_%d", i); 78 if (!dev_name) 79 return -ENOMEM; 80 81 pdev = platform_device_register_simple(dev_name, -1, NULL, 0); 82 kfree(dev_name); 83 if (IS_ERR(pdev)) 84 return PTR_ERR(pdev); 85 86 if (!devres_open_group(&pdev->dev, NULL, GFP_KERNEL)) { 87 ret = -ENOMEM; 88 goto out_unregister; 89 } 90 91 pxcp_dev = devm_drm_dev_alloc(&pdev->dev, &amdgpu_xcp_driver, struct xcp_device, drm); 92 if (IS_ERR(pxcp_dev)) { 93 ret = PTR_ERR(pxcp_dev); 94 goto out_devres; 95 } 96 97 xcp_dev[i] = pxcp_dev; 98 xcp_dev[i]->pdev = pdev; 99 *ddev = &pxcp_dev->drm; 100 pdev_num++; 101 102 return 0; 103 104 out_devres: 105 devres_release_group(&pdev->dev, NULL); 106 out_unregister: 107 platform_device_unregister(pdev); 108 109 return ret; 110 } 111 EXPORT_SYMBOL(amdgpu_xcp_drm_dev_alloc); 112 113 static void free_xcp_dev(uint8_t index) 114 { 115 if ((index < MAX_XCP_PLATFORM_DEVICE) && (xcp_dev[index])) { 116 struct platform_device *pdev = xcp_dev[index]->pdev; 117 118 devres_release_group(&pdev->dev, NULL); 119 platform_device_unregister(pdev); 120 121 xcp_dev[index] = NULL; 122 if (pdev_num > 0) 123 pdev_num--; 124 } 125 } 126 127 void amdgpu_xcp_drm_dev_free(struct drm_device *ddev) 128 { 129 uint8_t i; 130 131 guard(mutex)(&xcp_mutex); 132 133 for (i = 0; pdev_num && i < MAX_XCP_PLATFORM_DEVICE; i++) { 134 if ((xcp_dev[i]) && (&xcp_dev[i]->drm == ddev)) { 135 free_xcp_dev(i); 136 break; 137 } 138 } 139 } 140 EXPORT_SYMBOL(amdgpu_xcp_drm_dev_free); 141 142 void amdgpu_xcp_drv_release(void) 143 { 144 uint8_t i; 145 146 guard(mutex)(&xcp_mutex); 147 148 for (i = 0; pdev_num && i < MAX_XCP_PLATFORM_DEVICE; i++) { 149 free_xcp_dev(i); 150 } 151 } 152 EXPORT_SYMBOL(amdgpu_xcp_drv_release); 153 154 static void __exit amdgpu_xcp_drv_exit(void) 155 { 156 amdgpu_xcp_drv_release(); 157 } 158 159 module_exit(amdgpu_xcp_drv_exit); 160 161 MODULE_AUTHOR("AMD linux driver team"); 162 MODULE_DESCRIPTION("AMD XCP PLATFORM DEVICES"); 163 MODULE_LICENSE("GPL and additional rights"); 164