amdgpu_xcp_drv.c

  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
 35struct xcp_device {
 36	struct drm_device drm;
 37	struct platform_device *pdev;
 38};
 39
 40static 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
 47static int8_t pdev_num;
 48static struct xcp_device *xcp_dev[MAX_XCP_PLATFORM_DEVICE];
 49static DEFINE_MUTEX(xcp_mutex);
 50
 51int 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
 94out_devres:
 95	devres_release_group(&pdev->dev, NULL);
 96out_unregister:
 97	platform_device_unregister(pdev);
 98
 99	return ret;
100}
101EXPORT_SYMBOL(amdgpu_xcp_drm_dev_alloc);
102
103static 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
116void 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}
129EXPORT_SYMBOL(amdgpu_xcp_drm_dev_free);
130
131void 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}
141EXPORT_SYMBOL(amdgpu_xcp_drv_release);
142
143static void __exit amdgpu_xcp_drv_exit(void)
144{
145	amdgpu_xcp_drv_release();
146}
147
148module_exit(amdgpu_xcp_drv_exit);
149
150MODULE_AUTHOR("AMD linux driver team");
151MODULE_DESCRIPTION("AMD XCP PLATFORM DEVICES");
152MODULE_LICENSE("GPL and additional rights");