// SPDX-License-Identifier: GPL-2.0-only
/*
* AMD Secure Encrypted Virtualization (SEV) interface
*
* Copyright (C) 2016,2019 Advanced Micro Devices, Inc.
*
* Author: Brijesh Singh <brijesh.singh@amd.com>
*/
#include <linux/bitfield.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/kthread.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/spinlock_types.h>
#include <linux/types.h>
#include <linux/mutex.h>
#include <linux/delay.h>
#include <linux/hw_random.h>
#include <linux/ccp.h>
#include <linux/firmware.h>
#include <linux/gfp.h>
#include <linux/cpufeature.h>
#include <linux/fs.h>
#include <linux/fs_struct.h>
#include <linux/psp.h>
#include <asm/smp.h>
#include <asm/cacheflush.h>
#include "psp-dev.h"
#include "sev-dev.h"
#define DEVICE_NAME "sev"
#define SEV_FW_FILE "amd/sev.fw"
#define SEV_FW_NAME_SIZE 64
static DEFINE_MUTEX(sev_cmd_mutex);
static struct sev_misc_dev *misc_dev;
static int psp_cmd_timeout = 100;
module_param(psp_cmd_timeout, int, 0644);
MODULE_PARM_DESC(psp_cmd_timeout, " default timeout value, in seconds, for PSP commands");
static int psp_probe_timeout = 5;
module_param(psp_probe_timeout, int, 0644);
MODULE_PARM_DESC(psp_probe_timeout, " default timeout value, in seconds, during PSP device probe");
static char *init_ex_path;
module_param(init_ex_path, charp, 0444);
MODULE_PARM_DESC(init_ex_path, " Path for INIT_EX data; if set try INIT_EX");
static bool psp_init_on_probe = true;
module_param(psp_init_on_probe, bool, 0444);
MODULE_PARM_DESC(psp_init_on_probe, " if true, the PSP will be initialized on module init. Else the PSP will be initialized on the first command requiring it");
MODULE_FIRMWARE("amd/amd_sev_fam17h_model0xh.sbin"); /* 1st gen EPYC */
MODULE_FIRMWARE("amd/amd_sev_fam17h_model3xh.sbin"); /* 2nd gen EPYC */
MODULE_FIRMWARE("amd/amd_sev_fam19h_model0xh.sbin"); /* 3rd gen EPYC */
MODULE_FIRMWARE("amd/amd_sev_fam19h_model1xh.sbin"); /* 4th gen EPYC */
static bool psp_dead;
static int psp_timeout;
/* Trusted Memory Region (TMR):
* The TMR is a 1MB area that must be 1MB aligned. Use the page allocator
* to allocate the memory, which will return aligned memory for the specified
* allocation order.
*/
#define SEV_ES_TMR_SIZE (1024 * 1024)
static void *sev_es_tmr;
/* INIT_EX NV Storage:
* The NV Storage is a 32Kb area and must be 4Kb page aligned. Use the page
* allocator to allocate the memory, which will return aligned memory for the
* specified allocation order.
*/
#define NV_LENGTH (32 * 1024)
static void *sev_init_ex_buffer;
static