Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * Copyright (c) Microsoft Corporation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * Author:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  *   Haiyang Zhang <haiyangz@microsoft.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  * This small module is a helper driver allows other drivers to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)  * have a common interface with the Hyper-V PCI frontend driver.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/hyperv.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) struct hyperv_pci_block_ops hvpci_block_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) EXPORT_SYMBOL_GPL(hvpci_block_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) int hyperv_read_cfg_blk(struct pci_dev *dev, void *buf, unsigned int buf_len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 			unsigned int block_id, unsigned int *bytes_returned)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 	if (!hvpci_block_ops.read_block)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 		return -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	return hvpci_block_ops.read_block(dev, buf, buf_len, block_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 					  bytes_returned);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) EXPORT_SYMBOL_GPL(hyperv_read_cfg_blk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) int hyperv_write_cfg_blk(struct pci_dev *dev, void *buf, unsigned int len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 			 unsigned int block_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	if (!hvpci_block_ops.write_block)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 		return -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	return hvpci_block_ops.write_block(dev, buf, len, block_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) EXPORT_SYMBOL_GPL(hyperv_write_cfg_blk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) int hyperv_reg_block_invalidate(struct pci_dev *dev, void *context,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 				void (*block_invalidate)(void *context,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 							 u64 block_mask))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 	if (!hvpci_block_ops.reg_blk_invalidate)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 		return -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	return hvpci_block_ops.reg_blk_invalidate(dev, context,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 						  block_invalidate);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) EXPORT_SYMBOL_GPL(hyperv_reg_block_invalidate);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) static void __exit exit_hv_pci_intf(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) static int __init init_hv_pci_intf(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) module_init(init_hv_pci_intf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) module_exit(exit_hv_pci_intf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) MODULE_DESCRIPTION("Hyper-V PCI Interface");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) MODULE_LICENSE("GPL v2");