drivers/crypto/ccp/ccp-dev.h - kernel/bruno - Git at Google

 /*
  * AMD Cryptographic Coprocessor (CCP) driver
  *
  * Copyright (C) 2013 Advanced Micro Devices, Inc.
  *
  * Author: Tom Lendacky <thomas.lendacky@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>

 #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)

 /****** REQ0 Related Values ******/
 #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_KSB_BITS			256
 #define CCP_KSB_BYTES			32

 #define CCP_JOBID_MASK			0x0000003f

 #define CCP_DMAPOOL_MAX_SIZE		64
 #define CCP_DMAPOOL_ALIGN		BIT(5)

 #define CCP_REVERSE_BUF_SIZE		64

 #define CCP_AES_KEY_KSB_COUNT		1
 #define CCP_AES_CTX_KSB_COUNT		1

 #define CCP_XTS_AES_KEY_KSB_COUNT	1
 #define CCP_XTS_AES_CTX_KSB_COUNT	1

 #define CCP_SHA_KSB_COUNT		1

 #define CCP_RSA_MAX_WIDTH		4096

 #define CCP_PASSTHRU_BLOCKSIZE		256
 #define CCP_PASSTHRU_MASKSIZE		32
 #define CCP_PASSTHRU_KSB_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

 struct ccp_device;
 struct ccp_cmd;

 struct ccp_cmd_queue {
 	struct ccp_device *ccp;

 	/* Queue identifier */
 	u32 id;

 	/* Queue dma pool */
 	struct dma_pool *dma_pool;

 	/* Queue reserved KSB regions */
 	u32 ksb_key;
 	u32 ksb_ctx;

 	/* 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_status;
 	void __iomem *reg_int_status;

 	/* 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;
 } ____cacheline_aligned;

 struct ccp_device {
 	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 irq;

 	/*
 	 * 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;

 	/*
 	 * A counter used to generate job-ids for cmds submitted to the CCP
 	 */
 	atomic_t current_id ____cacheline_aligned;

 	/*
 	 * The CCP uses key storage blocks (KSB) to maintain context for certain
 	 * operations. To prevent multiple cmds from using the same KSB range
 	 * a command queue reserves a KSB range for the duration of the cmd.
 	 * Each queue, will however, reserve 2 KSB blocks for operations that
 	 * only require single KSB entries (eg. AES context/iv and key) in order
 	 * to avoid allocation contention.  This will reserve at most 10 KSB
 	 * entries, leaving 40 KSB entries available for dynamic allocation.
 	 */
 	struct mutex ksb_mutex ____cacheline_aligned;
 	DECLARE_BITMAP(ksb, KSB_COUNT);
 	wait_queue_head_t ksb_queue;
 	unsigned int ksb_avail;
 	unsigned int ksb_count;
 	u32 ksb_start;

 	/* Suspend support */
 	unsigned int suspending;
 	wait_queue_head_t suspend_queue;

 	/* DMA caching attribute support */
 	unsigned int axcache;
 };

 int ccp_pci_init(void);
 void ccp_pci_exit(void);

 int ccp_platform_init(void);
 void ccp_platform_exit(void);

 struct ccp_device *ccp_alloc_struct(struct device *dev);
 int ccp_init(struct ccp_device *ccp);
 void ccp_destroy(struct ccp_device *ccp);
 bool ccp_queues_suspended(struct ccp_device *ccp);

 irqreturn_t ccp_irq_handler(int irq, void *data);

 int ccp_run_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd);

 #endif
	/*
	* AMD Cryptographic Coprocessor (CCP) driver
	*
	* Copyright (C) 2013 Advanced Micro Devices, Inc.
	*
	* Author: Tom Lendacky <thomas.lendacky@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>

	#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)

	/**** REQ0 Related Values ****/
	#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_KSB_BITS 256
	#define CCP_KSB_BYTES 32

	#define CCP_JOBID_MASK 0x0000003f

	#define CCP_DMAPOOL_MAX_SIZE 64
	#define CCP_DMAPOOL_ALIGN BIT(5)

	#define CCP_REVERSE_BUF_SIZE 64

	#define CCP_AES_KEY_KSB_COUNT 1
	#define CCP_AES_CTX_KSB_COUNT 1

	#define CCP_XTS_AES_KEY_KSB_COUNT 1
	#define CCP_XTS_AES_CTX_KSB_COUNT 1

	#define CCP_SHA_KSB_COUNT 1

	#define CCP_RSA_MAX_WIDTH 4096

	#define CCP_PASSTHRU_BLOCKSIZE 256
	#define CCP_PASSTHRU_MASKSIZE 32
	#define CCP_PASSTHRU_KSB_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

	struct ccp_device;
	struct ccp_cmd;

	struct ccp_cmd_queue {
	struct ccp_device *ccp;

	/* Queue identifier */
	u32 id;

	/* Queue dma pool */
	struct dma_pool *dma_pool;

	/* Queue reserved KSB regions */
	u32 ksb_key;
	u32 ksb_ctx;

	/* 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_status;
	void __iomem *reg_int_status;

	/* 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;
	} ____cacheline_aligned;

	struct ccp_device {
	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 irq;

	/*
	* 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;

	/*
	* A counter used to generate job-ids for cmds submitted to the CCP
	*/
	atomic_t current_id ____cacheline_aligned;

	/*
	* The CCP uses key storage blocks (KSB) to maintain context for certain
	* operations. To prevent multiple cmds from using the same KSB range
	* a command queue reserves a KSB range for the duration of the cmd.
	* Each queue, will however, reserve 2 KSB blocks for operations that
	* only require single KSB entries (eg. AES context/iv and key) in order
	* to avoid allocation contention. This will reserve at most 10 KSB
	* entries, leaving 40 KSB entries available for dynamic allocation.
	*/
	struct mutex ksb_mutex ____cacheline_aligned;
	DECLARE_BITMAP(ksb, KSB_COUNT);
	wait_queue_head_t ksb_queue;
	unsigned int ksb_avail;
	unsigned int ksb_count;
	u32 ksb_start;

	/* Suspend support */
	unsigned int suspending;
	wait_queue_head_t suspend_queue;

	/* DMA caching attribute support */
	unsigned int axcache;
	};

	int ccp_pci_init(void);
	void ccp_pci_exit(void);

	int ccp_platform_init(void);
	void ccp_platform_exit(void);

	struct ccp_device ccp_alloc_struct(struct device dev);
	int ccp_init(struct ccp_device *ccp);
	void ccp_destroy(struct ccp_device *ccp);
	bool ccp_queues_suspended(struct ccp_device *ccp);

	irqreturn_t ccp_irq_handler(int irq, void *data);

	int ccp_run_cmd(struct ccp_cmd_queue cmd_q, struct ccp_cmd cmd);

	#endif