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720419f018
The CCP device is part of the AMD Secure Processor. In order to expand the usage of the AMD Secure Processor, create a framework that allows functional components of the AMD Secure Processor to be initialized and handled appropriately. Signed-off-by: Brijesh Singh <brijesh.singh@amd.com> Acked-by: Gary R Hook <gary.hook@amd.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
182 lines
3.3 KiB
C
182 lines
3.3 KiB
C
/*
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* AMD Secure Processor driver
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*
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* Copyright (C) 2017 Advanced Micro Devices, Inc.
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*
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* Author: Tom Lendacky <thomas.lendacky@amd.com>
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* Author: Gary R Hook <gary.hook@amd.com>
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* Author: Brijesh Singh <brijesh.singh@amd.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/kthread.h>
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#include <linux/sched.h>
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#include <linux/interrupt.h>
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#include <linux/spinlock.h>
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#include <linux/spinlock_types.h>
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#include <linux/types.h>
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#include <linux/ccp.h>
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#include "ccp-dev.h"
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#include "sp-dev.h"
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MODULE_AUTHOR("Tom Lendacky <thomas.lendacky@amd.com>");
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MODULE_AUTHOR("Gary R Hook <gary.hook@amd.com>");
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MODULE_LICENSE("GPL");
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MODULE_VERSION("1.1.0");
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MODULE_DESCRIPTION("AMD Secure Processor driver");
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/* List of SPs, SP count, read-write access lock, and access functions
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*
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* Lock structure: get sp_unit_lock for reading whenever we need to
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* examine the SP list.
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*/
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static DEFINE_RWLOCK(sp_unit_lock);
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static LIST_HEAD(sp_units);
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/* Ever-increasing value to produce unique unit numbers */
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static atomic_t sp_ordinal;
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static void sp_add_device(struct sp_device *sp)
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{
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unsigned long flags;
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write_lock_irqsave(&sp_unit_lock, flags);
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list_add_tail(&sp->entry, &sp_units);
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write_unlock_irqrestore(&sp_unit_lock, flags);
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}
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static void sp_del_device(struct sp_device *sp)
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{
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unsigned long flags;
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write_lock_irqsave(&sp_unit_lock, flags);
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list_del(&sp->entry);
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write_unlock_irqrestore(&sp_unit_lock, flags);
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}
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/**
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* sp_alloc_struct - allocate and initialize the sp_device struct
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*
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* @dev: device struct of the SP
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*/
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struct sp_device *sp_alloc_struct(struct device *dev)
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{
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struct sp_device *sp;
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sp = devm_kzalloc(dev, sizeof(*sp), GFP_KERNEL);
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if (!sp)
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return NULL;
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sp->dev = dev;
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sp->ord = atomic_inc_return(&sp_ordinal);
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snprintf(sp->name, SP_MAX_NAME_LEN, "sp-%u", sp->ord);
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return sp;
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}
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int sp_init(struct sp_device *sp)
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{
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sp_add_device(sp);
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if (sp->dev_vdata->ccp_vdata)
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ccp_dev_init(sp);
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return 0;
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}
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void sp_destroy(struct sp_device *sp)
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{
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if (sp->dev_vdata->ccp_vdata)
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ccp_dev_destroy(sp);
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sp_del_device(sp);
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}
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#ifdef CONFIG_PM
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int sp_suspend(struct sp_device *sp, pm_message_t state)
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{
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int ret;
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if (sp->dev_vdata->ccp_vdata) {
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ret = ccp_dev_suspend(sp, state);
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if (ret)
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return ret;
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}
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return 0;
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}
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int sp_resume(struct sp_device *sp)
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{
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int ret;
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if (sp->dev_vdata->ccp_vdata) {
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ret = ccp_dev_resume(sp);
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if (ret)
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return ret;
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}
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return 0;
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}
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#endif
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static int __init sp_mod_init(void)
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{
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#ifdef CONFIG_X86
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int ret;
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ret = ccp_pci_init();
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if (ret)
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return ret;
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/* Don't leave the driver loaded if init failed */
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if (ccp_present() != 0) {
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ccp_pci_exit();
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return -ENODEV;
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}
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return 0;
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#endif
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#ifdef CONFIG_ARM64
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int ret;
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ret = ccp_platform_init();
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if (ret)
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return ret;
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/* Don't leave the driver loaded if init failed */
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if (ccp_present() != 0) {
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ccp_platform_exit();
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return -ENODEV;
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}
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return 0;
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#endif
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return -ENODEV;
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}
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static void __exit sp_mod_exit(void)
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{
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#ifdef CONFIG_X86
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ccp_pci_exit();
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#endif
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#ifdef CONFIG_ARM64
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ccp_platform_exit();
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#endif
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}
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module_init(sp_mod_init);
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module_exit(sp_mod_exit);
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