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 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 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); 104 105 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