/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * AMD Platform Security Processor (PSP) interface driver
 *
 * Copyright (C) 2017-2019 Advanced Micro Devices, Inc.
 *
 * Author: Brijesh Singh <brijesh.singh@amd.com>
 */

#ifndef __SEV_DEV_H__
#define __SEV_DEV_H__

#include <linux/device.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <linux/list.h>
#include <linux/wait.h>
#include <linux/dmapool.h>
#include <linux/hw_random.h>
#include <linux/bitops.h>
#include <linux/interrupt.h>
#include <linux/irqreturn.h>
#include <linux/dmaengine.h>
#include <linux/psp-sev.h>
#include <linux/miscdevice.h>
#include <linux/capability.h>

#define SEV_CMDRESP_CMD                 GENMASK(26, 16)
#define SEV_CMD_COMPLETE                BIT(1)
#define SEV_CMDRESP_IOC                 BIT(0)

struct sev_misc_dev {
        struct kref refcount;
        struct miscdevice misc;
};

struct sev_tio_status;

struct sev_device {
        struct device *dev;
        struct psp_device *psp;

        void __iomem *io_regs;

        struct sev_vdata *vdata;

        unsigned int int_rcvd;
        wait_queue_head_t int_queue;
        struct sev_misc_dev *misc;

        u8 api_major;
        u8 api_minor;
        u8 build;

        void *cmd_buf;
        void *cmd_buf_backup;
        bool cmd_buf_active;
        bool cmd_buf_backup_active;

        bool snp_initialized;

        struct sev_user_data_status sev_plat_status;

        struct sev_user_data_snp_status snp_plat_status;
        struct snp_feature_info snp_feat_info_0;

        struct tsm_dev *tsmdev;
        struct sev_tio_status *tio_status;
};

int sev_dev_init(struct psp_device *psp);
void sev_dev_destroy(struct psp_device *psp);

int __sev_do_cmd_locked(int cmd, void *data, int *psp_ret);

void sev_pci_init(void);
void sev_pci_exit(void);

struct page *snp_alloc_hv_fixed_pages(unsigned int num_2mb_pages);
void snp_free_hv_fixed_pages(struct page *page);

void sev_tsm_init_locked(struct sev_device *sev, void *tio_status_page);
void sev_tsm_uninit(struct sev_device *sev);
int sev_tio_cmd_buffer_len(int cmd);

#endif /* __SEV_DEV_H */