153 lines
3.0 KiB
C
Executable File
153 lines
3.0 KiB
C
Executable File
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2023 MediaTek Inc.
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*/
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#include <linux/device.h>
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#include <linux/file.h>
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#include <linux/kdev_t.h>
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#include <linux/miscdevice.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/soc/mediatek/gzvm_drv.h>
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/**
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* gzvm_err_to_errno() - Convert geniezone return value to standard errno
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*
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* @err: Return value from geniezone function return
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*
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* Return: Standard errno
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*/
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int gzvm_err_to_errno(unsigned long err)
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{
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int gz_err = (int)err;
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switch (gz_err) {
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case 0:
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return 0;
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case ERR_NO_MEMORY:
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return -ENOMEM;
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case ERR_INVALID_ARGS:
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return -EINVAL;
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case ERR_NOT_SUPPORTED:
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fallthrough;
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case ERR_NOT_IMPLEMENTED:
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return -EOPNOTSUPP;
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case ERR_FAULT:
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return -EFAULT;
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default:
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break;
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}
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return -EINVAL;
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}
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/**
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* gzvm_dev_ioctl_check_extension() - Check if given capability is support
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* or not
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*
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* @gzvm: Pointer to struct gzvm
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* @args: Pointer in u64 from userspace
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*
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* Return:
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* * 0 - Supported, no error
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* * -EOPNOTSUPP - Unsupported
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* * -EFAULT - Failed to get data from userspace
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*/
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long gzvm_dev_ioctl_check_extension(struct gzvm *gzvm, unsigned long args)
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{
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__u64 cap;
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void __user *argp = (void __user *)args;
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if (copy_from_user(&cap, argp, sizeof(uint64_t)))
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return -EFAULT;
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return gzvm_arch_check_extension(gzvm, cap, argp);
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}
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static long gzvm_dev_ioctl(struct file *filp, unsigned int cmd,
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unsigned long user_args)
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{
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switch (cmd) {
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case GZVM_CREATE_VM:
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return gzvm_dev_ioctl_create_vm(user_args);
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case GZVM_CHECK_EXTENSION:
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if (!user_args)
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return -EINVAL;
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return gzvm_dev_ioctl_check_extension(NULL, user_args);
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default:
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break;
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}
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return -ENOTTY;
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}
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static const struct file_operations gzvm_chardev_ops = {
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.unlocked_ioctl = gzvm_dev_ioctl,
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.llseek = noop_llseek,
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};
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static struct miscdevice gzvm_dev = {
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.minor = MISC_DYNAMIC_MINOR,
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.name = KBUILD_MODNAME,
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.fops = &gzvm_chardev_ops,
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};
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static int gzvm_drv_probe(struct platform_device *pdev)
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{
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int ret;
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if (gzvm_arch_probe() != 0) {
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dev_err(&pdev->dev, "Not found available conduit\n");
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return -ENODEV;
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}
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ret = gzvm_arch_drv_init();
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if (ret)
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return ret;
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ret = misc_register(&gzvm_dev);
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if (ret)
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return ret;
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ret = gzvm_drv_irqfd_init();
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if (ret)
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return ret;
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ret = gzvm_drv_debug_init();
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if (ret)
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return ret;
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return 0;
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}
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static int gzvm_drv_remove(struct platform_device *pdev)
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{
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gzvm_drv_irqfd_exit();
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gzvm_destroy_all_vms();
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misc_deregister(&gzvm_dev);
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gzvm_drv_debug_exit();
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return 0;
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}
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static const struct of_device_id gzvm_of_match[] = {
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{ .compatible = "mediatek,geniezone" },
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{/* sentinel */},
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};
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static struct platform_driver gzvm_driver = {
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.probe = gzvm_drv_probe,
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.remove = gzvm_drv_remove,
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.driver = {
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.name = KBUILD_MODNAME,
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.of_match_table = gzvm_of_match,
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},
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};
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module_platform_driver(gzvm_driver);
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MODULE_DEVICE_TABLE(of, gzvm_of_match);
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MODULE_AUTHOR("MediaTek");
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MODULE_DESCRIPTION("GenieZone interface for VMM");
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MODULE_LICENSE("GPL");
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