/*
* AMD Cryptographic Coprocessor (CCP) driver
*
* Copyright (C) 2013,2016 Advanced Micro Devices, Inc.
*
* Author: Tom Lendacky <thomas.lendacky@amd.com>
* Author: Gary R Hook <gary.hook@amd.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef __CCP_DEV_H__
#define __CCP_DEV_H__
#include <linux/device.h>
#include <linux/pci.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>
#define MAX_CCP_NAME_LEN 16
#define MAX_DMAPOOL_NAME_LEN 32
#define MAX_HW_QUEUES 5
#define MAX_CMD_QLEN 100
#define TRNG_RETRIES 10
#define CACHE_NONE 0x00
#define CACHE_WB_NO_ALLOC 0xb7
/****** Register Mappings ******/
#define Q_MASK_REG 0x000
#define TRNG_OUT_REG 0x00c
#define IRQ_MASK_REG 0x040
#define IRQ_STATUS_REG 0x200
#define DEL_CMD_Q_JOB 0x124
#define DEL_Q_ACTIVE 0x00000200
#define DEL_Q_ID_SHIFT 6
#define CMD_REQ0 0x180
#define CMD_REQ_INCR 0x04
#define CMD_Q_STATUS_BASE 0x210
#define CMD_Q_INT_STATUS_BASE 0x214
#define CMD_Q_STATUS_INCR 0x20
#define CMD_Q_CACHE_BASE 0x228
#define CMD_Q_CACHE_INC 0x20
#define CMD_Q_ERROR(__qs) ((__qs) & 0x0000003f)
#define CMD_Q_DEPTH(__qs) (((__qs) >> 12) & 0x0000000f)
/* ------------------------ CCP Version 5 Specifics ------------------------ */
#define CMD5_QUEUE_MASK_OFFSET 0x00
#define CMD5_QUEUE_PRIO_OFFSET 0x04
#define CMD5_REQID_CONFIG_OFFSET 0x08
#define CMD5_CMD_TIMEOUT_OFFSET 0x10
#define LSB_PUBLIC_MASK_LO_OFFSET 0x18
#define LSB_PUBLIC_MASK_HI_OFFSET 0x1C
#define LSB_PRIVATE_MASK_LO_OFFSET 0x20
#define LSB_PRIVATE_MASK_HI_OFFSET 0x24
#define CMD5_PSP_CCP_VERSION 0x100
#define CMD5_Q_CONTROL_BASE 0x0000
#define CMD5_Q_TAIL_LO_BASE 0x0004
#define CMD5_Q_HEAD_LO_BASE 0x0008
#define CMD5_Q_INT_ENABLE_BASE 0x000C
#define CMD5_Q_INTERRUPT_STATUS_BASE 0x0010
#define CMD5_Q_STATUS_BASE 0x0100
#define CMD5_Q_INT_STATUS_BASE 0x0104
#define CMD5_Q_DMA_STATUS_BASE 0x0108
#define CMD5_Q_DMA_READ_STATUS_BASE 0x010C
#define CMD5_Q_DMA_WRITE_STATUS_BASE 0x0110
#define CMD5_Q_ABORT_BASE 0x0114
#define CMD5_Q_AX_CACHE_BASE 0x0118
#define CMD5_CONFIG_0_OFFSET 0x6000
#define CMD5_TRNG_CTL_OFFSET 0x6008
#define CMD5_AES_MASK_OFFSET 0x6010
#define CMD5_CLK_GATE_CTL_OFFSET 0x603C
/* Address offset between two virtual queue registers */
#define CMD5_Q_STATUS_INCR 0x1000
/* Bit masks */
#define CMD5_Q_RUN 0x1
#define CMD5_Q_HALT 0x2
#define CMD5_Q_MEM_LOCATION 0x4
#define CMD5_Q_SIZE 0x1F
#define CMD5_Q_SHIFT 3
#define COMMANDS_PER_QUEUE 16
#define QUEUE_SIZE_VAL ((ffs(COMMANDS_PER_QUEUE) - 2) & \
CMD5_Q_SIZE)
#define Q_PTR_MASK (2 << (QUEUE_SIZE_VAL + 5) - 1)
#define Q_DESC_SIZE sizeof(struct ccp5_desc)
#define Q_SIZE(n) (COMMANDS_PER_QUEUE*(n))
#define INT_COMPLETION 0x1
#define INT_ERROR 0x2
#define INT_QUEUE_STOPPED 0x4
#define INT_EMPTY_QUEUE 0x8
#define SUPPORTED_INTERRUPTS (INT_COMPLETION | INT_ERROR)
#define LSB_REGION_WIDTH 5
#define MAX_LSB_CNT 8
#define LSB_SIZE 16
#define LSB_ITEM_SIZE 32
#define PLSB_MAP_SIZE (LSB_SIZE)
#define SLSB_MAP_SIZE (MAX_LSB_CNT * LSB_SIZE)
#define LSB_ENTRY_NUMBER(LSB_ADDR) (LSB_ADDR / LSB_ITEM_SIZE)
/* ------------------------ CCP Version 3 Specifics ------------------------ */
#define REQ0_WAIT_FOR_WRITE 0x00000004
#define REQ0_INT_ON_COMPLETE 0x00000002
#define REQ0_STOP_ON_COMPLETE 0x00000001
#define REQ0_CMD_Q_SHIFT 9
#define REQ0_JOBID_SHIFT 3
/****** REQ1 Related Values ******/
#define REQ1_PROTECT_SHIFT 27
#define REQ1_ENGINE_SHIFT 23
#define REQ1_KEY_KSB_SHIFT 2
#define REQ1_EOM 0x00000002
#define REQ1_INIT 0x00000001
/* AES Related Values */
#define REQ1_AES_TYPE_SHIFT 21
#define REQ1_AES_MODE_SHIFT 18
#define REQ1_AES_ACTION_SHIFT 17
#define REQ1_AES_CFB_SIZE_SHIFT 10
/* XTS-AES Related Values */
#define REQ1_XTS_AES_SIZE_SHIFT 10
/* SHA Related Values */
#define REQ1_SHA_TYPE_SHIFT 21
/* RSA Related Values */
#define REQ1_RSA_MOD_SIZE_SHIFT 10
/* Pass-Through Related Values */
#define REQ1_PT_BW_SHIFT 12
#define REQ1_PT_BS_SHIFT 10
/* ECC Related Values */
#define REQ1_ECC_AFFINE_CONVERT 0x00200000
#define REQ1_ECC_FUNCTION_SHIFT 18
/****** REQ4 Related Values ******/
#define REQ4_KSB_SHIFT 18
#define REQ4_MEMTYPE_SHIFT 16
/****** REQ6 Related Values ******/
#define REQ6_MEMTYPE_SHIFT 16
/****** Key Storage Block ******/
#define KSB_START 77
#define KSB_END 127
#define KSB_COUNT (KSB_END - KSB_START + 1)
#define CCP_SB_BITS 256
#define CCP_JOBID_MASK 0x0000003f
/* ------------------------ General CCP Defines ------------------------ */
#define CCP_DMA_DFLT 0x0
#define CCP_DMA_PRIV 0x1
#define CCP_DMA_PUB 0x2
#define CCP_DMAPOOL_MAX_SIZE 64
#define CCP_DMAPOOL_ALIGN BIT(5)
#define CCP_REVERSE_BUF_SIZE 64
#define CCP_AES_KEY_SB_COUNT 1
#define CCP_AES_CTX_SB_COUNT 1
#define CCP_XTS_AES_KEY_SB_COUNT 1
#define CCP_XTS_AES_CTX_SB_COUNT 1
#define CCP_DES3_KEY_SB_COUNT 1
#define CCP_DES3_CTX_SB_COUNT 1
#define CCP_SHA_SB_COUNT 1
#define CCP_RSA_MAX_WIDTH 4096
#define CCP_PASSTHRU_BLOCKSIZE 256
#define CCP_PASSTHRU_MASKSIZE 32
#define CCP_PASSTHRU_SB_COUNT 1
#define CCP_ECC_MODULUS_BYTES 48 /* 384-bits */
#define CCP_ECC_MAX_OPERANDS 6
#define CCP_ECC_MAX_OUTPUTS 3
#define CCP_ECC_SRC_BUF_SIZE 448
#define CCP_ECC_DST_BUF_SIZE 192
#define CCP_ECC_OPERAND_SIZE 64
#define CCP_ECC_OUTPUT_SIZE 64
#define CCP_ECC_RESULT_OFFSET 60
#define CCP_ECC_RESULT_SUCCESS 0x0001
#define CCP_SB_BYTES 32
struct ccp_op;
struct ccp_device;
struct ccp_cmd;
struct ccp_fns;
struct ccp_dma_cmd {
struct list_head entry;
struct ccp_cmd ccp_cmd;
};
struct ccp_dma_desc {
struct list_head entry;
struct ccp_device *ccp;
struct list_head pending;
struct list_head active;
enum dma_status status;
struct dma_async_tx_descriptor tx_desc;
size_t len;
};
struct ccp_dma_chan {
struct ccp_device *ccp;
spinlock_t lock;
struct list_head created;
struct list_head pending;
struct list_head active;
struct list_head complete;
struct tasklet_struct cleanup_tasklet;
enum dma_status status;
struct dma_chan dma_chan;
};
struct ccp_cmd_queue {
struct ccp_device *ccp;
/* Queue identifier */
u32 id;
/* Queue dma pool */
struct dma_pool *dma_pool;
/* Queue base address (not neccessarily aligned)*/
struct ccp5_desc *qbase;
/* Aligned queue start address (per requirement) */
struct mutex q_mutex ____cacheline_aligned;
unsigned int qidx;
/* Version 5 has different requirements for queue memory */
unsigned int qsize;
dma_addr_t qbase_dma;
dma_addr_t qdma_tail;
/* Per-queue reserved storage block(s) */
u32 sb_key;
u32 sb_ctx;
/* Bitmap of LSBs that can be accessed by this queue */
DECLARE_BITMAP(lsbmask, MAX_LSB_CNT);
/* Private LSB that is assigned to this queue, or -1 if none.
* Bitmap for my private LSB, unused otherwise
*/
int lsb;
DECLARE_BITMAP(lsbmap, PLSB_MAP_SIZE);
/* Queue processing thread */
struct task_struct *kthread;
unsigned int active;
unsigned int suspended;
/* Number of free command slots available */
unsigned int free_slots;
/* Interrupt masks */
u32 int_ok;
u32 int_err;
/* Register addresses for queue */
void __iomem *reg_control;
void __iomem *reg_tail_lo;
void __iomem *reg_head_lo;
void __iomem *reg_int_enable;
void __iomem *reg_interrupt_status;
void __iomem *reg_status;
void __iomem *reg_int_status;
void __iomem *reg_dma_status;
void __iomem *reg_dma_read_status;
void __iomem *reg_dma_write_status;
u32 qcontrol; /* Cached control register */
/* Status values from job */
u32 int_status;
u32 q_status;
u32 q_int_status;
u32 cmd_error;
/* Interrupt wait queue */
wait_queue_head_t int_queue;
unsigned int int_rcvd;
/* Per-queue Statistics */
unsigned long total_ops;
unsigned long total_aes_ops;
unsigned long total_xts_aes_ops;
unsigned long total_3des_ops;
unsigned long total_sha_ops;
unsigned long total_rsa_ops;
unsigned long total_pt_ops;
unsigned long total_ecc_ops;
} ____cacheline_aligned;
struct ccp_device {
struct list_head entry;
struct ccp_vdata *vdata;
unsigned int ord;
char name[MAX_CCP_NAME_LEN];
char rngname[MAX_CCP_NAME_LEN];
struct device *dev;
/* Bus specific device information
*/
void *dev_specific;
int (*get_irq)(struct ccp_device *ccp);
void (*free_irq)(struct ccp_device *ccp);
unsigned int qim;
unsigned int irq;
bool use_tasklet;
struct tasklet_struct irq_tasklet;
/* I/O area used for device communication. The register mapping
* starts at an offset into the mapped bar.
* The CMD_REQx registers and the Delete_Cmd_Queue_Job register
* need to be protected while a command queue thread is accessing
* them.
*/
struct mutex req_mutex ____cacheline_aligned;
void __iomem *io_map;
void __iomem *io_regs;
/* Master lists that all cmds are queued on. Because there can be
* more than one CCP command queue that can process a cmd a separate
* backlog list is neeeded so that the backlog completion call
* completes before the cmd is available for execution.
*/
spinlock_t cmd_lock ____cacheline_aligned;
unsigned int cmd_count;
struct list_head cmd;
struct list_head backlog;
/* The command queues. These represent the queues available on the
* CCP that are available for processing cmds
*/
struct ccp_cmd_queue cmd_q[MAX_HW_QUEUES];
unsigned int cmd_q_count;
/* Support for the CCP True RNG
*/
struct hwrng hwrng;
unsigned int hwrng_retries;
/* Support for the CCP DMA capabilities
*/
struct dma_device dma_dev;
struct ccp_dma_chan *ccp_dma_chan;
struct kmem_cache *dma_cmd_cache;
struct kmem_cache *dma_desc_cache;
/* A counter used to generate job-ids for cmds submitted to the CCP
*/
atomic_t current_id ____cacheline_aligned;
/* The v3 CCP uses key storage blocks (SB) to maintain context for
* certain operations. To prevent multiple cmds from using the same
* SB range a command queue reserves an SB range for the duration of
* the cmd. Each queue, will however, reserve 2 SB blocks for
* operations that only require single SB entries (eg. AES context/iv
* and key) in order to avoid allocation contention. This will reserve
* at most 10 SB entries, leaving 40 SB entries available for dynamic
* allocation.
*
* The v5 CCP Local Storage Block (LSB) is broken up into 8
* memrory ranges, each of which can be enabled for access by one
* or more queues. Device initialization takes this into account,
* and attempts to assign one region for exclusive use by each
* available queue; the rest are then aggregated as "public" use.
* If there are fewer regions than queues, all regions are shared
* amongst all queues.
*/
struct mutex sb_mutex ____cacheline_aligned;
DECLARE_BITMAP(sb, KSB_COUNT);
wait_queue_head_t sb_queue;
unsigned int sb_avail;
unsigned int sb_count;
u32 sb_start;
/* Bitmap of shared LSBs, if any */
DECLARE_BITMAP(lsbmap, SLSB_MAP_SIZE);
/* Suspend support */
unsigned int suspending;
wait_queue_head_t suspend_queue;
/* DMA caching attribute support */
unsigned int axcache;
/* Device Statistics */
unsigned long total_interrupts;
/* DebugFS info */
struct dentry *debugfs_instance;
};
enum ccp_memtype {
CCP_MEMTYPE_SYSTEM = 0,
CCP_MEMTYPE_SB,
CCP_MEMTYPE_LOCAL,
CCP_MEMTYPE__LAST,
};
#define CCP_MEMTYPE_LSB CCP_MEMTYPE_KSB
struct ccp_dma_info {
dma_addr_t address;
unsigned int offset;
unsigned int length;
enum dma_data_direction dir;
} __packed __aligned(4);
struct ccp_dm_workarea {
struct device *dev;
struct dma_pool *dma_pool;
u8 *address;
struct ccp_dma_info dma;
unsigned int length;
};
struct ccp_sg_workarea {
struct scatterlist *sg;
int nents;
unsigned int sg_used;
struct scatterlist *dma_sg;
struct device *dma_dev;
unsigned int dma_count;
enum dma_data_direction dma_dir;
u64 bytes_left;
};
struct ccp_data {
struct ccp_sg_workarea sg_wa;
struct ccp_dm_workarea dm_wa;
};
struct ccp_mem {
enum ccp_memtype type;
union {
struct ccp_dma_info dma;
u32 sb;
} u;
};
struct ccp_aes_op {
enum ccp_aes_type type;
enum ccp_aes_mode mode;
enum ccp_aes_action action;
unsigned int size;
};
struct ccp_xts_aes_op {
enum ccp_aes_action action;
enum ccp_xts_aes_unit_size unit_size;
};
struct ccp_des3_op {
enum ccp_des3_type type;
enum ccp_des3_mode mode;
enum ccp_des3_action action;
};
struct ccp_sha_op {
enum ccp_sha_type type;
u64 msg_bits;
};
struct ccp_rsa_op {
u32 mod_size;
u32 input_len;
};
struct ccp_passthru_op {
enum ccp_passthru_bitwise bit_mod;
enum ccp_passthru_byteswap byte_swap;
};
struct ccp_ecc_op {
enum ccp_ecc_function function;
};
struct ccp_op {
struct ccp_cmd_queue *cmd_q;
u32 jobid;
u32 ioc;
u32 soc;
u32 sb_key;
u32 sb_ctx;
u32 init;
u32 eom;
struct ccp_mem src;
struct ccp_mem dst;
struct ccp_mem exp;
union {
struct ccp_aes_op aes;
struct ccp_xts_aes_op xts;
struct ccp_des3_op des3;
struct ccp_sha_op sha;
struct ccp_rsa_op rsa;
struct ccp_passthru_op passthru;
struct ccp_ecc_op ecc;
} u;
};
static inline u32 ccp_addr_lo(struct ccp_dma_info *info)
{
return lower_32_bits(info->address + info->offset);
}
static inline u32 ccp_addr_hi(struct ccp_dma_info *info)
{
return upper_32_bits(info->address + info->offset) & 0x0000ffff;
}
/**
* descriptor for version 5 CPP commands
* 8 32-bit words:
* word 0: function; engine; control bits
* word 1: length of source data
* word 2: low 32 bits of source pointer
* word 3: upper 16 bits of source pointer; source memory type
* word 4: low 32 bits of destination pointer
* word 5: upper 16 bits of destination pointer; destination memory type
* word 6: low 32 bits of key pointer
* word 7: upper 16 bits of key pointer; key memory type
*/
struct dword0 {
unsigned int soc:1;
unsigned int ioc:1;
unsigned int rsvd1:1;
unsigned int init:1;
unsigned int eom:1; /* AES/SHA only */
unsigned int function:15;
unsigned int engine:4;
unsigned int prot:1;
unsigned int rsvd2:7;
};
struct dword3 {
unsigned int src_hi:16;
unsigned int src_mem:2;
unsigned int lsb_cxt_id:8;
unsigned int rsvd1:5;
unsigned int fixed:1;
};
union dword4 {
__le32 dst_lo; /* NON-SHA */
__le32 sha_len_lo; /* SHA */
};
union dword5 {
struct {
unsigned int dst_hi:16;
unsigned int dst_mem:2;
unsigned int rsvd1:13;
unsigned int fixed:1;
} fields;
__le32 sha_len_hi;
};
struct dword7 {
unsigned int key_hi:16;
unsigned int key_mem:2;
unsigned int rsvd1:14;
};
struct ccp5_desc {
struct dword0 dw0;
__le32 length;
__le32 src_lo;
struct dword3 dw3;
union dword4 dw4;
union dword5 dw5;
__le32 key_lo;
struct dword7 dw7;
};
int ccp_pci_init(void);
void ccp_pci_exit(void);
int ccp_platform_init(void);
void ccp_platform_exit(void);
void ccp_add_device(struct ccp_device *ccp);
void ccp_del_device(struct ccp_device *ccp);
extern void ccp_log_error(struct ccp_device *, int);
struct ccp_device *ccp_alloc_struct(struct device *dev);
bool ccp_queues_suspended(struct ccp_device *ccp);
int ccp_cmd_queue_thread(void *data);
int ccp_trng_read(struct hwrng *rng, void *data, size_t max, bool wait);
int ccp_run_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd);
int ccp_register_rng(struct ccp_device *ccp);
void ccp_unregister_rng(struct ccp_device *ccp);
int ccp_dmaengine_register(struct ccp_device *ccp);
void ccp_dmaengine_unregister(struct ccp_device *ccp);
void ccp5_debugfs_setup(struct ccp_device *ccp);
void ccp5_debugfs_destroy(void);
/* Structure for computation functions that are device-specific */
struct ccp_actions {
int (*aes)(struct ccp_op *);
int (*xts_aes)(struct ccp_op *);
int (*des3)(struct ccp_op *);
int (*sha)(struct ccp_op *);
int (*rsa)(struct ccp_op *);
int (*passthru)(struct ccp_op *);
int (*ecc)(struct ccp_op *);
u32 (*sballoc)(struct ccp_cmd_queue *, unsigned int);
void (*sbfree)(struct ccp_cmd_queue *, unsigned int, unsigned int);
unsigned int (*get_free_slots)(struct ccp_cmd_queue *);
int (*init)(struct ccp_device *);
void (*destroy)(struct ccp_device *);
irqreturn_t (*irqhandler)(int, void *);
};
/* Structure to hold CCP version-specific values */
struct ccp_vdata {
const unsigned int version;
const unsigned int dma_chan_attr;
void (*setup)(struct ccp_device *);
const struct ccp_actions *perform;
const unsigned int bar;
const unsigned int offset;
};
extern const struct ccp_vdata ccpv3;
extern const struct ccp_vdata ccpv5a;
extern const struct ccp_vdata ccpv5b;
#endif
