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crypto: ccp - CCP device driver and interface support

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These routines provide the device driver support for the AMD
Cryptographic Coprocessor (CCP).

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Tom Lendacky 2013-11-12 11:46:16 -06:00 committed by Herbert Xu
parent 8ec25c5129
commit 63b945091a
5 changed files with 3759 additions and 0 deletions
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582
drivers/crypto/ccp/ccp-dev.c Normal file
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/*
* 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.
*/
#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/mutex.h>
#include <linux/delay.h>
#include <linux/hw_random.h>
#include <linux/cpu.h>
#include <asm/cpu_device_id.h>
#include <linux/ccp.h>
#include "ccp-dev.h"
MODULE_AUTHOR("Tom Lendacky <thomas.lendacky@amd.com>");
MODULE_LICENSE("GPL");
MODULE_VERSION("1.0.0");
MODULE_DESCRIPTION("AMD Cryptographic Coprocessor driver");
static struct ccp_device *ccp_dev;
static inline struct ccp_device *ccp_get_device(void)
{
return ccp_dev;
}
static inline void ccp_add_device(struct ccp_device *ccp)
{
ccp_dev = ccp;
}
static inline void ccp_del_device(struct ccp_device *ccp)
{
ccp_dev = NULL;
}
/**
* ccp_enqueue_cmd - queue an operation for processing by the CCP
*
* @cmd: ccp_cmd struct to be processed
*
* Queue a cmd to be processed by the CCP. If queueing the cmd
* would exceed the defined length of the cmd queue the cmd will
* only be queued if the CCP_CMD_MAY_BACKLOG flag is set and will
* result in a return code of -EBUSY.
*
* The callback routine specified in the ccp_cmd struct will be
* called to notify the caller of completion (if the cmd was not
* backlogged) or advancement out of the backlog. If the cmd has
* advanced out of the backlog the "err" value of the callback
* will be -EINPROGRESS. Any other "err" value during callback is
* the result of the operation.
*
* The cmd has been successfully queued if:
* the return code is -EINPROGRESS or
* the return code is -EBUSY and CCP_CMD_MAY_BACKLOG flag is set
*/
int ccp_enqueue_cmd(struct ccp_cmd *cmd)
{
struct ccp_device *ccp = ccp_get_device();
unsigned long flags;
unsigned int i;
int ret;
if (!ccp)
return -ENODEV;
/* Caller must supply a callback routine */
if (!cmd->callback)
return -EINVAL;
cmd->ccp = ccp;
spin_lock_irqsave(&ccp->cmd_lock, flags);
i = ccp->cmd_q_count;
if (ccp->cmd_count >= MAX_CMD_QLEN) {
ret = -EBUSY;
if (cmd->flags & CCP_CMD_MAY_BACKLOG)
list_add_tail(&cmd->entry, &ccp->backlog);
} else {
ret = -EINPROGRESS;
ccp->cmd_count++;
list_add_tail(&cmd->entry, &ccp->cmd);
/* Find an idle queue */
if (!ccp->suspending) {
for (i = 0; i < ccp->cmd_q_count; i++) {
if (ccp->cmd_q[i].active)
continue;
break;
}
}
}
spin_unlock_irqrestore(&ccp->cmd_lock, flags);
/* If we found an idle queue, wake it up */
if (i < ccp->cmd_q_count)
wake_up_process(ccp->cmd_q[i].kthread);
return ret;
}
EXPORT_SYMBOL_GPL(ccp_enqueue_cmd);
static void ccp_do_cmd_backlog(struct work_struct *work)
{
struct ccp_cmd *cmd = container_of(work, struct ccp_cmd, work);
struct ccp_device *ccp = cmd->ccp;
unsigned long flags;
unsigned int i;
cmd->callback(cmd->data, -EINPROGRESS);
spin_lock_irqsave(&ccp->cmd_lock, flags);
ccp->cmd_count++;
list_add_tail(&cmd->entry, &ccp->cmd);
/* Find an idle queue */
for (i = 0; i < ccp->cmd_q_count; i++) {
if (ccp->cmd_q[i].active)
continue;
break;
}
spin_unlock_irqrestore(&ccp->cmd_lock, flags);
/* If we found an idle queue, wake it up */
if (i < ccp->cmd_q_count)
wake_up_process(ccp->cmd_q[i].kthread);
}
static struct ccp_cmd *ccp_dequeue_cmd(struct ccp_cmd_queue *cmd_q)
{
struct ccp_device *ccp = cmd_q->ccp;
struct ccp_cmd *cmd = NULL;
struct ccp_cmd *backlog = NULL;
unsigned long flags;
spin_lock_irqsave(&ccp->cmd_lock, flags);
cmd_q->active = 0;
if (ccp->suspending) {
cmd_q->suspended = 1;
spin_unlock_irqrestore(&ccp->cmd_lock, flags);
wake_up_interruptible(&ccp->suspend_queue);
return NULL;
}
if (ccp->cmd_count) {
cmd_q->active = 1;
cmd = list_first_entry(&ccp->cmd, struct ccp_cmd, entry);
list_del(&cmd->entry);
ccp->cmd_count--;
}
if (!list_empty(&ccp->backlog)) {
backlog = list_first_entry(&ccp->backlog, struct ccp_cmd,
entry);
list_del(&backlog->entry);
}
spin_unlock_irqrestore(&ccp->cmd_lock, flags);
if (backlog) {
INIT_WORK(&backlog->work, ccp_do_cmd_backlog);
schedule_work(&backlog->work);
}
return cmd;
}
static void ccp_do_cmd_complete(struct work_struct *work)
{
struct ccp_cmd *cmd = container_of(work, struct ccp_cmd, work);
cmd->callback(cmd->data, cmd->ret);
}
static int ccp_cmd_queue_thread(void *data)
{
struct ccp_cmd_queue *cmd_q = (struct ccp_cmd_queue *)data;
struct ccp_cmd *cmd;
set_current_state(TASK_INTERRUPTIBLE);
while (!kthread_should_stop()) {
schedule();
set_current_state(TASK_INTERRUPTIBLE);
cmd = ccp_dequeue_cmd(cmd_q);
if (!cmd)
continue;
__set_current_state(TASK_RUNNING);
/* Execute the command */
cmd->ret = ccp_run_cmd(cmd_q, cmd);
/* Schedule the completion callback */
INIT_WORK(&cmd->work, ccp_do_cmd_complete);
schedule_work(&cmd->work);
}
__set_current_state(TASK_RUNNING);
return 0;
}
static int ccp_trng_read(struct hwrng *rng, void *data, size_t max, bool wait)
{
struct ccp_device *ccp = container_of(rng, struct ccp_device, hwrng);
u32 trng_value;
int len = min_t(int, sizeof(trng_value), max);
/*
* Locking is provided by the caller so we can update device
* hwrng-related fields safely
*/
trng_value = ioread32(ccp->io_regs + TRNG_OUT_REG);
if (!trng_value) {
/* Zero is returned if not data is available or if a
* bad-entropy error is present. Assume an error if
* we exceed TRNG_RETRIES reads of zero.
*/
if (ccp->hwrng_retries++ > TRNG_RETRIES)
return -EIO;
return 0;
}
/* Reset the counter and save the rng value */
ccp->hwrng_retries = 0;
memcpy(data, &trng_value, len);
return len;
}
/**
* ccp_alloc_struct - allocate and initialize the ccp_device struct
*
* @dev: device struct of the CCP
*/
struct ccp_device *ccp_alloc_struct(struct device *dev)
{
struct ccp_device *ccp;
ccp = kzalloc(sizeof(*ccp), GFP_KERNEL);
if (ccp == NULL) {
dev_err(dev, "unable to allocate device struct\n");
return NULL;
}
ccp->dev = dev;
INIT_LIST_HEAD(&ccp->cmd);
INIT_LIST_HEAD(&ccp->backlog);
spin_lock_init(&ccp->cmd_lock);
mutex_init(&ccp->req_mutex);
mutex_init(&ccp->ksb_mutex);
ccp->ksb_count = KSB_COUNT;
ccp->ksb_start = 0;
return ccp;
}
/**
* ccp_init - initialize the CCP device
*
* @ccp: ccp_device struct
*/
int ccp_init(struct ccp_device *ccp)
{
struct device *dev = ccp->dev;
struct ccp_cmd_queue *cmd_q;
struct dma_pool *dma_pool;
char dma_pool_name[MAX_DMAPOOL_NAME_LEN];
unsigned int qmr, qim, i;
int ret;
/* Find available queues */
qim = 0;
qmr = ioread32(ccp->io_regs + Q_MASK_REG);
for (i = 0; i < MAX_HW_QUEUES; i++) {
if (!(qmr & (1 << i)))
continue;
/* Allocate a dma pool for this queue */
snprintf(dma_pool_name, sizeof(dma_pool_name), "ccp_q%d", i);
dma_pool = dma_pool_create(dma_pool_name, dev,
CCP_DMAPOOL_MAX_SIZE,
CCP_DMAPOOL_ALIGN, 0);
if (!dma_pool) {
dev_err(dev, "unable to allocate dma pool\n");
ret = -ENOMEM;
goto e_pool;
}
cmd_q = &ccp->cmd_q[ccp->cmd_q_count];
ccp->cmd_q_count++;
cmd_q->ccp = ccp;
cmd_q->id = i;
cmd_q->dma_pool = dma_pool;
/* Reserve 2 KSB regions for the queue */
cmd_q->ksb_key = KSB_START + ccp->ksb_start++;
cmd_q->ksb_ctx = KSB_START + ccp->ksb_start++;
ccp->ksb_count -= 2;
/* Preset some register values and masks that are queue
* number dependent
*/
cmd_q->reg_status = ccp->io_regs + CMD_Q_STATUS_BASE +
(CMD_Q_STATUS_INCR * i);
cmd_q->reg_int_status = ccp->io_regs + CMD_Q_INT_STATUS_BASE +
(CMD_Q_STATUS_INCR * i);
cmd_q->int_ok = 1 << (i * 2);
cmd_q->int_err = 1 << ((i * 2) + 1);
cmd_q->free_slots = CMD_Q_DEPTH(ioread32(cmd_q->reg_status));
init_waitqueue_head(&cmd_q->int_queue);
/* Build queue interrupt mask (two interrupts per queue) */
qim |= cmd_q->int_ok | cmd_q->int_err;
dev_dbg(dev, "queue #%u available\n", i);
}
if (ccp->cmd_q_count == 0) {
dev_notice(dev, "no command queues available\n");
ret = -EIO;
goto e_pool;
}
dev_notice(dev, "%u command queues available\n", ccp->cmd_q_count);
/* Disable and clear interrupts until ready */
iowrite32(0x00, ccp->io_regs + IRQ_MASK_REG);
for (i = 0; i < ccp->cmd_q_count; i++) {
cmd_q = &ccp->cmd_q[i];
ioread32(cmd_q->reg_int_status);
ioread32(cmd_q->reg_status);
}
iowrite32(qim, ccp->io_regs + IRQ_STATUS_REG);
/* Request an irq */
ret = ccp->get_irq(ccp);
if (ret) {
dev_err(dev, "unable to allocate an IRQ\n");
goto e_pool;
}
/* Initialize the queues used to wait for KSB space and suspend */
init_waitqueue_head(&ccp->ksb_queue);
init_waitqueue_head(&ccp->suspend_queue);
/* Create a kthread for each queue */
for (i = 0; i < ccp->cmd_q_count; i++) {
struct task_struct *kthread;
cmd_q = &ccp->cmd_q[i];
kthread = kthread_create(ccp_cmd_queue_thread, cmd_q,
"ccp-q%u", cmd_q->id);
if (IS_ERR(kthread)) {
dev_err(dev, "error creating queue thread (%ld)\n",
PTR_ERR(kthread));
ret = PTR_ERR(kthread);
goto e_kthread;
}
cmd_q->kthread = kthread;
wake_up_process(kthread);
}
/* Register the RNG */
ccp->hwrng.name = "ccp-rng";
ccp->hwrng.read = ccp_trng_read;
ret = hwrng_register(&ccp->hwrng);
if (ret) {
dev_err(dev, "error registering hwrng (%d)\n", ret);
goto e_kthread;
}
/* Make the device struct available before enabling interrupts */
ccp_add_device(ccp);
/* Enable interrupts */
iowrite32(qim, ccp->io_regs + IRQ_MASK_REG);
return 0;
e_kthread:
for (i = 0; i < ccp->cmd_q_count; i++)
if (ccp->cmd_q[i].kthread)
kthread_stop(ccp->cmd_q[i].kthread);
ccp->free_irq(ccp);
e_pool:
for (i = 0; i < ccp->cmd_q_count; i++)
dma_pool_destroy(ccp->cmd_q[i].dma_pool);
return ret;
}
/**
* ccp_destroy - tear down the CCP device
*
* @ccp: ccp_device struct
*/
void ccp_destroy(struct ccp_device *ccp)
{
struct ccp_cmd_queue *cmd_q;
struct ccp_cmd *cmd;
unsigned int qim, i;
/* Remove general access to the device struct */
ccp_del_device(ccp);
/* Unregister the RNG */
hwrng_unregister(&ccp->hwrng);
/* Stop the queue kthreads */
for (i = 0; i < ccp->cmd_q_count; i++)
if (ccp->cmd_q[i].kthread)
kthread_stop(ccp->cmd_q[i].kthread);
/* Build queue interrupt mask (two interrupt masks per queue) */
qim = 0;
for (i = 0; i < ccp->cmd_q_count; i++) {
cmd_q = &ccp->cmd_q[i];
qim |= cmd_q->int_ok | cmd_q->int_err;
}
/* Disable and clear interrupts */
iowrite32(0x00, ccp->io_regs + IRQ_MASK_REG);
for (i = 0; i < ccp->cmd_q_count; i++) {
cmd_q = &ccp->cmd_q[i];
ioread32(cmd_q->reg_int_status);
ioread32(cmd_q->reg_status);
}
iowrite32(qim, ccp->io_regs + IRQ_STATUS_REG);
ccp->free_irq(ccp);
for (i = 0; i < ccp->cmd_q_count; i++)
dma_pool_destroy(ccp->cmd_q[i].dma_pool);
/* Flush the cmd and backlog queue */
while (!list_empty(&ccp->cmd)) {
/* Invoke the callback directly with an error code */
cmd = list_first_entry(&ccp->cmd, struct ccp_cmd, entry);
list_del(&cmd->entry);
cmd->callback(cmd->data, -ENODEV);
}
while (!list_empty(&ccp->backlog)) {
/* Invoke the callback directly with an error code */
cmd = list_first_entry(&ccp->backlog, struct ccp_cmd, entry);
list_del(&cmd->entry);
cmd->callback(cmd->data, -ENODEV);
}
}
/**
* ccp_irq_handler - handle interrupts generated by the CCP device
*
* @irq: the irq associated with the interrupt
* @data: the data value supplied when the irq was created
*/
irqreturn_t ccp_irq_handler(int irq, void *data)
{
struct device *dev = data;
struct ccp_device *ccp = dev_get_drvdata(dev);
struct ccp_cmd_queue *cmd_q;
u32 q_int, status;
unsigned int i;
status = ioread32(ccp->io_regs + IRQ_STATUS_REG);
for (i = 0; i < ccp->cmd_q_count; i++) {
cmd_q = &ccp->cmd_q[i];
q_int = status & (cmd_q->int_ok | cmd_q->int_err);
if (q_int) {
cmd_q->int_status = status;
cmd_q->q_status = ioread32(cmd_q->reg_status);
cmd_q->q_int_status = ioread32(cmd_q->reg_int_status);
/* On error, only save the first error value */
if ((q_int & cmd_q->int_err) && !cmd_q->cmd_error)
cmd_q->cmd_error = CMD_Q_ERROR(cmd_q->q_status);
cmd_q->int_rcvd = 1;
/* Acknowledge the interrupt and wake the kthread */
iowrite32(q_int, ccp->io_regs + IRQ_STATUS_REG);
wake_up_interruptible(&cmd_q->int_queue);
}
}
return IRQ_HANDLED;
}
#ifdef CONFIG_PM
bool ccp_queues_suspended(struct ccp_device *ccp)
{
unsigned int suspended = 0;
unsigned long flags;
unsigned int i;
spin_lock_irqsave(&ccp->cmd_lock, flags);
for (i = 0; i < ccp->cmd_q_count; i++)
if (ccp->cmd_q[i].suspended)
suspended++;
spin_unlock_irqrestore(&ccp->cmd_lock, flags);
return ccp->cmd_q_count == suspended;
}
#endif
static const struct x86_cpu_id ccp_support[] = {
{ X86_VENDOR_AMD, 22, },
};
static int __init ccp_mod_init(void)
{
struct cpuinfo_x86 *cpuinfo = &boot_cpu_data;
if (!x86_match_cpu(ccp_support))
return -ENODEV;
switch (cpuinfo->x86) {
case 22:
if ((cpuinfo->x86_model < 48) || (cpuinfo->x86_model > 63))
return -ENODEV;
return ccp_pci_init();
break;
};
return -ENODEV;
}
static void __exit ccp_mod_exit(void)
{
struct cpuinfo_x86 *cpuinfo = &boot_cpu_data;
switch (cpuinfo->x86) {
case 22:
ccp_pci_exit();
break;
};
}
module_init(ccp_mod_init);
module_exit(ccp_mod_exit);

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drivers/crypto/ccp/ccp-dev.h Normal file
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/*
* 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>
#define IO_OFFSET 0x20000
#define MAX_DMAPOOL_NAME_LEN 32
#define MAX_HW_QUEUES 5
#define MAX_CMD_QLEN 100
#define TRNG_RETRIES 10
/****** 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 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 (1 << 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);
/*
* 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;
};
int ccp_pci_init(void);
void ccp_pci_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

2020
drivers/crypto/ccp/ccp-ops.c Normal file
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/*
* 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.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/pci_ids.h>
#include <linux/kthread.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/delay.h>
#include <linux/ccp.h>
#include "ccp-dev.h"
#define IO_BAR 2
#define MSIX_VECTORS 2
struct ccp_msix {
u32 vector;
char name[16];
};
struct ccp_pci {
int msix_count;
struct ccp_msix msix[MSIX_VECTORS];
};
static int ccp_get_msix_irqs(struct ccp_device *ccp)
{
struct ccp_pci *ccp_pci = ccp->dev_specific;
struct device *dev = ccp->dev;
struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
struct msix_entry msix_entry[MSIX_VECTORS];
unsigned int name_len = sizeof(ccp_pci->msix[0].name) - 1;
int v, ret;
for (v = 0; v < ARRAY_SIZE(msix_entry); v++)
msix_entry[v].entry = v;
while ((ret = pci_enable_msix(pdev, msix_entry, v)) > 0)
v = ret;
if (ret)
return ret;
ccp_pci->msix_count = v;
for (v = 0; v < ccp_pci->msix_count; v++) {
/* Set the interrupt names and request the irqs */
snprintf(ccp_pci->msix[v].name, name_len, "ccp-%u", v);
ccp_pci->msix[v].vector = msix_entry[v].vector;
ret = request_irq(ccp_pci->msix[v].vector, ccp_irq_handler,
0, ccp_pci->msix[v].name, dev);
if (ret) {
dev_notice(dev, "unable to allocate MSI-X IRQ (%d)\n",
ret);
goto e_irq;
}
}
return 0;
e_irq:
while (v--)
free_irq(ccp_pci->msix[v].vector, dev);
pci_disable_msix(pdev);
ccp_pci->msix_count = 0;
return ret;
}
static int ccp_get_msi_irq(struct ccp_device *ccp)
{
struct device *dev = ccp->dev;
struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
int ret;
ret = pci_enable_msi(pdev);
if (ret)
return ret;
ret = request_irq(pdev->irq, ccp_irq_handler, 0, "ccp", dev);
if (ret) {
dev_notice(dev, "unable to allocate MSI IRQ (%d)\n", ret);
goto e_msi;
}
return 0;
e_msi:
pci_disable_msi(pdev);
return ret;
}
static int ccp_get_irqs(struct ccp_device *ccp)
{
struct device *dev = ccp->dev;
int ret;
ret = ccp_get_msix_irqs(ccp);
if (!ret)
return 0;
/* Couldn't get MSI-X vectors, try MSI */
dev_notice(dev, "could not enable MSI-X (%d), trying MSI\n", ret);
ret = ccp_get_msi_irq(ccp);
if (!ret)
return 0;
/* Couldn't get MSI interrupt */
dev_notice(dev, "could not enable MSI (%d)\n", ret);
return ret;
}
static void ccp_free_irqs(struct ccp_device *ccp)
{
struct ccp_pci *ccp_pci = ccp->dev_specific;
struct device *dev = ccp->dev;
struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
if (ccp_pci->msix_count) {
while (ccp_pci->msix_count--)
free_irq(ccp_pci->msix[ccp_pci->msix_count].vector,
dev);
pci_disable_msix(pdev);
} else {
free_irq(pdev->irq, dev);
pci_disable_msi(pdev);
}
}
static int ccp_find_mmio_area(struct ccp_device *ccp)
{
struct device *dev = ccp->dev;
struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
resource_size_t io_len;
unsigned long io_flags;
int bar;
io_flags = pci_resource_flags(pdev, IO_BAR);
io_len = pci_resource_len(pdev, IO_BAR);
if ((io_flags & IORESOURCE_MEM) && (io_len >= (IO_OFFSET + 0x800)))
return IO_BAR;
for (bar = 0; bar < PCI_STD_RESOURCE_END; bar++) {
io_flags = pci_resource_flags(pdev, bar);
io_len = pci_resource_len(pdev, bar);
if ((io_flags & IORESOURCE_MEM) &&
(io_len >= (IO_OFFSET + 0x800)))
return bar;
}
return -EIO;
}
static int ccp_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
struct ccp_device *ccp;
struct ccp_pci *ccp_pci;
struct device *dev = &pdev->dev;
unsigned int bar;
int ret;
ret = -ENOMEM;
ccp = ccp_alloc_struct(dev);
if (!ccp)
goto e_err;
ccp_pci = kzalloc(sizeof(*ccp_pci), GFP_KERNEL);
if (!ccp_pci) {
ret = -ENOMEM;
goto e_free1;
}
ccp->dev_specific = ccp_pci;
ccp->get_irq = ccp_get_irqs;
ccp->free_irq = ccp_free_irqs;
ret = pci_request_regions(pdev, "ccp");
if (ret) {
dev_err(dev, "pci_request_regions failed (%d)\n", ret);
goto e_free2;
}
ret = pci_enable_device(pdev);
if (ret) {
dev_err(dev, "pci_enable_device failed (%d)\n", ret);
goto e_regions;
}
pci_set_master(pdev);
ret = ccp_find_mmio_area(ccp);
if (ret < 0)
goto e_device;
bar = ret;
ret = -EIO;
ccp->io_map = pci_iomap(pdev, bar, 0);
if (ccp->io_map == NULL) {
dev_err(dev, "pci_iomap failed\n");
goto e_device;
}
ccp->io_regs = ccp->io_map + IO_OFFSET;
ret = dma_set_mask(dev, DMA_BIT_MASK(48));
if (ret == 0) {
ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(48));
if (ret) {
dev_err(dev,
"pci_set_consistent_dma_mask failed (%d)\n",
ret);
goto e_bar0;
}
} else {
ret = dma_set_mask(dev, DMA_BIT_MASK(32));
if (ret) {
dev_err(dev, "pci_set_dma_mask failed (%d)\n", ret);
goto e_bar0;
}
}
dev_set_drvdata(dev, ccp);
ret = ccp_init(ccp);
if (ret)
goto e_bar0;
dev_notice(dev, "enabled\n");
return 0;
e_bar0:
pci_iounmap(pdev, ccp->io_map);
e_device:
pci_disable_device(pdev);
dev_set_drvdata(dev, NULL);
e_regions:
pci_release_regions(pdev);
e_free2:
kfree(ccp_pci);
e_free1:
kfree(ccp);
e_err:
dev_notice(dev, "initialization failed\n");
return ret;
}
static void ccp_pci_remove(struct pci_dev *pdev)
{
struct device *dev = &pdev->dev;
struct ccp_device *ccp = dev_get_drvdata(dev);
ccp_destroy(ccp);
pci_iounmap(pdev, ccp->io_map);
pci_disable_device(pdev);
dev_set_drvdata(dev, NULL);
pci_release_regions(pdev);
kfree(ccp);
dev_notice(dev, "disabled\n");
}
#ifdef CONFIG_PM
static int ccp_pci_suspend(struct pci_dev *pdev, pm_message_t state)
{
struct device *dev = &pdev->dev;
struct ccp_device *ccp = dev_get_drvdata(dev);
unsigned long flags;
unsigned int i;
spin_lock_irqsave(&ccp->cmd_lock, flags);
ccp->suspending = 1;
/* Wake all the queue kthreads to prepare for suspend */
for (i = 0; i < ccp->cmd_q_count; i++)
wake_up_process(ccp->cmd_q[i].kthread);
spin_unlock_irqrestore(&ccp->cmd_lock, flags);
/* Wait for all queue kthreads to say they're done */
while (!ccp_queues_suspended(ccp))
wait_event_interruptible(ccp->suspend_queue,
ccp_queues_suspended(ccp));
return 0;
}
static int ccp_pci_resume(struct pci_dev *pdev)
{
struct device *dev = &pdev->dev;
struct ccp_device *ccp = dev_get_drvdata(dev);
unsigned long flags;
unsigned int i;
spin_lock_irqsave(&ccp->cmd_lock, flags);
ccp->suspending = 0;
/* Wake up all the kthreads */
for (i = 0; i < ccp->cmd_q_count; i++) {
ccp->cmd_q[i].suspended = 0;
wake_up_process(ccp->cmd_q[i].kthread);
}
spin_unlock_irqrestore(&ccp->cmd_lock, flags);
return 0;
}
#endif
static DEFINE_PCI_DEVICE_TABLE(ccp_pci_table) = {
{ PCI_VDEVICE(AMD, 0x1537), },
/* Last entry must be zero */
{ 0, }
};
MODULE_DEVICE_TABLE(pci, ccp_pci_table);
static struct pci_driver ccp_pci_driver = {
.name = "AMD Cryptographic Coprocessor",
.id_table = ccp_pci_table,
.probe = ccp_pci_probe,
.remove = ccp_pci_remove,
#ifdef CONFIG_PM
.suspend = ccp_pci_suspend,
.resume = ccp_pci_resume,
#endif
};
int ccp_pci_init(void)
{
return pci_register_driver(&ccp_pci_driver);
}
void ccp_pci_exit(void)
{
pci_unregister_driver(&ccp_pci_driver);
}

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/*
* 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 __CPP_H__
#define __CPP_H__
#include <linux/scatterlist.h>
#include <linux/workqueue.h>
#include <linux/list.h>
#include <crypto/aes.h>
#include <crypto/sha.h>
struct ccp_device;
struct ccp_cmd;
/**
* ccp_enqueue_cmd - queue an operation for processing by the CCP
*
* @cmd: ccp_cmd struct to be processed
*
* Refer to the ccp_cmd struct below for required fields.
*
* Queue a cmd to be processed by the CCP. If queueing the cmd
* would exceed the defined length of the cmd queue the cmd will
* only be queued if the CCP_CMD_MAY_BACKLOG flag is set and will
* result in a return code of -EBUSY.
*
* The callback routine specified in the ccp_cmd struct will be
* called to notify the caller of completion (if the cmd was not
* backlogged) or advancement out of the backlog. If the cmd has
* advanced out of the backlog the "err" value of the callback
* will be -EINPROGRESS. Any other "err" value during callback is
* the result of the operation.
*
* The cmd has been successfully queued if:
* the return code is -EINPROGRESS or
* the return code is -EBUSY and CCP_CMD_MAY_BACKLOG flag is set
*/
int ccp_enqueue_cmd(struct ccp_cmd *cmd);
/***** AES engine *****/
/**
* ccp_aes_type - AES key size
*
* @CCP_AES_TYPE_128: 128-bit key
* @CCP_AES_TYPE_192: 192-bit key
* @CCP_AES_TYPE_256: 256-bit key
*/
enum ccp_aes_type {
CCP_AES_TYPE_128 = 0,
CCP_AES_TYPE_192,
CCP_AES_TYPE_256,
CCP_AES_TYPE__LAST,
};
/**
* ccp_aes_mode - AES operation mode
*
* @CCP_AES_MODE_ECB: ECB mode
* @CCP_AES_MODE_CBC: CBC mode
* @CCP_AES_MODE_OFB: OFB mode
* @CCP_AES_MODE_CFB: CFB mode
* @CCP_AES_MODE_CTR: CTR mode
* @CCP_AES_MODE_CMAC: CMAC mode
*/
enum ccp_aes_mode {
CCP_AES_MODE_ECB = 0,
CCP_AES_MODE_CBC,
CCP_AES_MODE_OFB,
CCP_AES_MODE_CFB,
CCP_AES_MODE_CTR,
CCP_AES_MODE_CMAC,
CCP_AES_MODE__LAST,
};
/**
* ccp_aes_mode - AES operation mode
*
* @CCP_AES_ACTION_DECRYPT: AES decrypt operation
* @CCP_AES_ACTION_ENCRYPT: AES encrypt operation
*/
enum ccp_aes_action {
CCP_AES_ACTION_DECRYPT = 0,
CCP_AES_ACTION_ENCRYPT,
CCP_AES_ACTION__LAST,
};
/**
* struct ccp_aes_engine - CCP AES operation
* @type: AES operation key size
* @mode: AES operation mode
* @action: AES operation (decrypt/encrypt)
* @key: key to be used for this AES operation
* @key_len: length in bytes of key
* @iv: IV to be used for this AES operation
* @iv_len: length in bytes of iv
* @src: data to be used for this operation
* @dst: data produced by this operation
* @src_len: length in bytes of data used for this operation
* @cmac_final: indicates final operation when running in CMAC mode
* @cmac_key: K1/K2 key used in final CMAC operation
* @cmac_key_len: length in bytes of cmac_key
*
* Variables required to be set when calling ccp_enqueue_cmd():
* - type, mode, action, key, key_len, src, dst, src_len
* - iv, iv_len for any mode other than ECB
* - cmac_final for CMAC mode
* - cmac_key, cmac_key_len for CMAC mode if cmac_final is non-zero
*
* The iv variable is used as both input and output. On completion of the
* AES operation the new IV overwrites the old IV.
*/
struct ccp_aes_engine {
enum ccp_aes_type type;
enum ccp_aes_mode mode;
enum ccp_aes_action action;
struct scatterlist *key;
u32 key_len; /* In bytes */
struct scatterlist *iv;
u32 iv_len; /* In bytes */
struct scatterlist *src, *dst;
u32 src_len; /* In bytes */
u32 cmac_final; /* Indicates final cmac cmd */
struct scatterlist *cmac_key; /* K1/K2 cmac key required for
* final cmac cmd */
u32 cmac_key_len; /* In bytes */
};
/***** XTS-AES engine *****/
/**
* ccp_xts_aes_unit_size - XTS unit size
*
* @CCP_XTS_AES_UNIT_SIZE_16: Unit size of 16 bytes
* @CCP_XTS_AES_UNIT_SIZE_512: Unit size of 512 bytes
* @CCP_XTS_AES_UNIT_SIZE_1024: Unit size of 1024 bytes
* @CCP_XTS_AES_UNIT_SIZE_2048: Unit size of 2048 bytes
* @CCP_XTS_AES_UNIT_SIZE_4096: Unit size of 4096 bytes
*/
enum ccp_xts_aes_unit_size {
CCP_XTS_AES_UNIT_SIZE_16 = 0,
CCP_XTS_AES_UNIT_SIZE_512,
CCP_XTS_AES_UNIT_SIZE_1024,
CCP_XTS_AES_UNIT_SIZE_2048,
CCP_XTS_AES_UNIT_SIZE_4096,
CCP_XTS_AES_UNIT_SIZE__LAST,
};
/**
* struct ccp_xts_aes_engine - CCP XTS AES operation
* @action: AES operation (decrypt/encrypt)
* @unit_size: unit size of the XTS operation
* @key: key to be used for this XTS AES operation
* @key_len: length in bytes of key
* @iv: IV to be used for this XTS AES operation
* @iv_len: length in bytes of iv
* @src: data to be used for this operation
* @dst: data produced by this operation
* @src_len: length in bytes of data used for this operation
* @final: indicates final XTS operation
*
* Variables required to be set when calling ccp_enqueue_cmd():
* - action, unit_size, key, key_len, iv, iv_len, src, dst, src_len, final
*
* The iv variable is used as both input and output. On completion of the
* AES operation the new IV overwrites the old IV.
*/
struct ccp_xts_aes_engine {
enum ccp_aes_action action;
enum ccp_xts_aes_unit_size unit_size;
struct scatterlist *key;
u32 key_len; /* In bytes */
struct scatterlist *iv;
u32 iv_len; /* In bytes */
struct scatterlist *src, *dst;
u32 src_len; /* In bytes */
u32 final;
};
/***** SHA engine *****/
#define CCP_SHA_BLOCKSIZE SHA256_BLOCK_SIZE
#define CCP_SHA_CTXSIZE SHA256_DIGEST_SIZE
/**
* ccp_sha_type - type of SHA operation
*
* @CCP_SHA_TYPE_1: SHA-1 operation
* @CCP_SHA_TYPE_224: SHA-224 operation
* @CCP_SHA_TYPE_256: SHA-256 operation
*/
enum ccp_sha_type {
CCP_SHA_TYPE_1 = 1,
CCP_SHA_TYPE_224,
CCP_SHA_TYPE_256,
CCP_SHA_TYPE__LAST,
};
/**
* struct ccp_sha_engine - CCP SHA operation
* @type: Type of SHA operation
* @ctx: current hash value
* @ctx_len: length in bytes of hash value
* @src: data to be used for this operation
* @src_len: length in bytes of data used for this operation
* @final: indicates final SHA operation
* @msg_bits: total length of the message in bits used in final SHA operation
*
* Variables required to be set when calling ccp_enqueue_cmd():
* - type, ctx, ctx_len, src, src_len, final
* - msg_bits if final is non-zero
*
* The ctx variable is used as both input and output. On completion of the
* SHA operation the new hash value overwrites the old hash value.
*/
struct ccp_sha_engine {
enum ccp_sha_type type;
struct scatterlist *ctx;
u32 ctx_len; /* In bytes */
struct scatterlist *src;
u32 src_len; /* In bytes */
u32 final; /* Indicates final sha cmd */
u64 msg_bits; /* Message length in bits required for
* final sha cmd */
};
/***** RSA engine *****/
/**
* struct ccp_rsa_engine - CCP RSA operation
* @key_size: length in bits of RSA key
* @exp: RSA exponent
* @exp_len: length in bytes of exponent
* @mod: RSA modulus
* @mod_len: length in bytes of modulus
* @src: data to be used for this operation
* @dst: data produced by this operation
* @src_len: length in bytes of data used for this operation
*
* Variables required to be set when calling ccp_enqueue_cmd():
* - key_size, exp, exp_len, mod, mod_len, src, dst, src_len
*/
struct ccp_rsa_engine {
u32 key_size; /* In bits */
struct scatterlist *exp;
u32 exp_len; /* In bytes */
struct scatterlist *mod;
u32 mod_len; /* In bytes */
struct scatterlist *src, *dst;
u32 src_len; /* In bytes */
};
/***** Passthru engine *****/
/**
* ccp_passthru_bitwise - type of bitwise passthru operation
*
* @CCP_PASSTHRU_BITWISE_NOOP: no bitwise operation performed
* @CCP_PASSTHRU_BITWISE_AND: perform bitwise AND of src with mask
* @CCP_PASSTHRU_BITWISE_OR: perform bitwise OR of src with mask
* @CCP_PASSTHRU_BITWISE_XOR: perform bitwise XOR of src with mask
* @CCP_PASSTHRU_BITWISE_MASK: overwrite with mask
*/
enum ccp_passthru_bitwise {
CCP_PASSTHRU_BITWISE_NOOP = 0,
CCP_PASSTHRU_BITWISE_AND,
CCP_PASSTHRU_BITWISE_OR,
CCP_PASSTHRU_BITWISE_XOR,
CCP_PASSTHRU_BITWISE_MASK,
CCP_PASSTHRU_BITWISE__LAST,
};
/**
* ccp_passthru_byteswap - type of byteswap passthru operation
*
* @CCP_PASSTHRU_BYTESWAP_NOOP: no byte swapping performed
* @CCP_PASSTHRU_BYTESWAP_32BIT: swap bytes within 32-bit words
* @CCP_PASSTHRU_BYTESWAP_256BIT: swap bytes within 256-bit words
*/
enum ccp_passthru_byteswap {
CCP_PASSTHRU_BYTESWAP_NOOP = 0,
CCP_PASSTHRU_BYTESWAP_32BIT,
CCP_PASSTHRU_BYTESWAP_256BIT,
CCP_PASSTHRU_BYTESWAP__LAST,
};
/**
* struct ccp_passthru_engine - CCP pass-through operation
* @bit_mod: bitwise operation to perform
* @byte_swap: byteswap operation to perform
* @mask: mask to be applied to data
* @mask_len: length in bytes of mask
* @src: data to be used for this operation
* @dst: data produced by this operation
* @src_len: length in bytes of data used for this operation
* @final: indicate final pass-through operation
*
* Variables required to be set when calling ccp_enqueue_cmd():
* - bit_mod, byte_swap, src, dst, src_len
* - mask, mask_len if bit_mod is not CCP_PASSTHRU_BITWISE_NOOP
*/
struct ccp_passthru_engine {
enum ccp_passthru_bitwise bit_mod;
enum ccp_passthru_byteswap byte_swap;
struct scatterlist *mask;
u32 mask_len; /* In bytes */
struct scatterlist *src, *dst;
u32 src_len; /* In bytes */
u32 final;
};
/***** ECC engine *****/
#define CCP_ECC_MODULUS_BYTES 48 /* 384-bits */
#define CCP_ECC_MAX_OPERANDS 6
#define CCP_ECC_MAX_OUTPUTS 3
/**
* ccp_ecc_function - type of ECC function
*
* @CCP_ECC_FUNCTION_MMUL_384BIT: 384-bit modular multiplication
* @CCP_ECC_FUNCTION_MADD_384BIT: 384-bit modular addition
* @CCP_ECC_FUNCTION_MINV_384BIT: 384-bit multiplicative inverse
* @CCP_ECC_FUNCTION_PADD_384BIT: 384-bit point addition
* @CCP_ECC_FUNCTION_PMUL_384BIT: 384-bit point multiplication
* @CCP_ECC_FUNCTION_PDBL_384BIT: 384-bit point doubling
*/
enum ccp_ecc_function {
CCP_ECC_FUNCTION_MMUL_384BIT = 0,
CCP_ECC_FUNCTION_MADD_384BIT,
CCP_ECC_FUNCTION_MINV_384BIT,
CCP_ECC_FUNCTION_PADD_384BIT,
CCP_ECC_FUNCTION_PMUL_384BIT,
CCP_ECC_FUNCTION_PDBL_384BIT,
};
/**
* struct ccp_ecc_modular_math - CCP ECC modular math parameters
* @operand_1: first operand for the modular math operation
* @operand_1_len: length of the first operand
* @operand_2: second operand for the modular math operation
* (not used for CCP_ECC_FUNCTION_MINV_384BIT)
* @operand_2_len: length of the second operand
* (not used for CCP_ECC_FUNCTION_MINV_384BIT)
* @result: result of the modular math operation
* @result_len: length of the supplied result buffer
*/
struct ccp_ecc_modular_math {
struct scatterlist *operand_1;
unsigned int operand_1_len; /* In bytes */
struct scatterlist *operand_2;
unsigned int operand_2_len; /* In bytes */
struct scatterlist *result;
unsigned int result_len; /* In bytes */
};
/**
* struct ccp_ecc_point - CCP ECC point definition
* @x: the x coordinate of the ECC point
* @x_len: the length of the x coordinate
* @y: the y coordinate of the ECC point
* @y_len: the length of the y coordinate
*/
struct ccp_ecc_point {
struct scatterlist *x;
unsigned int x_len; /* In bytes */
struct scatterlist *y;
unsigned int y_len; /* In bytes */
};
/**
* struct ccp_ecc_point_math - CCP ECC point math parameters
* @point_1: the first point of the ECC point math operation
* @point_2: the second point of the ECC point math operation
* (only used for CCP_ECC_FUNCTION_PADD_384BIT)
* @domain_a: the a parameter of the ECC curve
* @domain_a_len: the length of the a parameter
* @scalar: the scalar parameter for the point match operation
* (only used for CCP_ECC_FUNCTION_PMUL_384BIT)
* @scalar_len: the length of the scalar parameter
* (only used for CCP_ECC_FUNCTION_PMUL_384BIT)
* @result: the point resulting from the point math operation
*/
struct ccp_ecc_point_math {
struct ccp_ecc_point point_1;
struct ccp_ecc_point point_2;
struct scatterlist *domain_a;
unsigned int domain_a_len; /* In bytes */
struct scatterlist *scalar;
unsigned int scalar_len; /* In bytes */
struct ccp_ecc_point result;
};
/**
* struct ccp_ecc_engine - CCP ECC operation
* @function: ECC function to perform
* @mod: ECC modulus
* @mod_len: length in bytes of modulus
* @mm: module math parameters
* @pm: point math parameters
* @ecc_result: result of the ECC operation
*
* Variables required to be set when calling ccp_enqueue_cmd():
* - function, mod, mod_len
* - operand, operand_len, operand_count, output, output_len, output_count
* - ecc_result
*/
struct ccp_ecc_engine {
enum ccp_ecc_function function;
struct scatterlist *mod;
u32 mod_len; /* In bytes */
union {
struct ccp_ecc_modular_math mm;
struct ccp_ecc_point_math pm;
} u;
u16 ecc_result;
};
/**
* ccp_engine - CCP operation identifiers
*
* @CCP_ENGINE_AES: AES operation
* @CCP_ENGINE_XTS_AES: 128-bit XTS AES operation
* @CCP_ENGINE_RSVD1: unused
* @CCP_ENGINE_SHA: SHA operation
* @CCP_ENGINE_RSA: RSA operation
* @CCP_ENGINE_PASSTHRU: pass-through operation
* @CCP_ENGINE_ZLIB_DECOMPRESS: unused
* @CCP_ENGINE_ECC: ECC operation
*/
enum ccp_engine {
CCP_ENGINE_AES = 0,
CCP_ENGINE_XTS_AES_128,
CCP_ENGINE_RSVD1,
CCP_ENGINE_SHA,
CCP_ENGINE_RSA,
CCP_ENGINE_PASSTHRU,
CCP_ENGINE_ZLIB_DECOMPRESS,
CCP_ENGINE_ECC,
CCP_ENGINE__LAST,
};
/* Flag values for flags member of ccp_cmd */
#define CCP_CMD_MAY_BACKLOG 0x00000001
/**
* struct ccp_cmd - CPP operation request
* @entry: list element (ccp driver use only)
* @work: work element used for callbacks (ccp driver use only)
* @ccp: CCP device to be run on (ccp driver use only)
* @ret: operation return code (ccp driver use only)
* @flags: cmd processing flags
* @engine: CCP operation to perform
* @engine_error: CCP engine return code
* @u: engine specific structures, refer to specific engine struct below
* @callback: operation completion callback function
* @data: parameter value to be supplied to the callback function
*
* Variables required to be set when calling ccp_enqueue_cmd():
* - engine, callback
* - See the operation structures below for what is required for each
* operation.
*/
struct ccp_cmd {
/* The list_head, work_struct, ccp and ret variables are for use
* by the CCP driver only.
*/
struct list_head entry;
struct work_struct work;
struct ccp_device *ccp;
int ret;
u32 flags;
enum ccp_engine engine;
u32 engine_error;
union {
struct ccp_aes_engine aes;
struct ccp_xts_aes_engine xts;
struct ccp_sha_engine sha;
struct ccp_rsa_engine rsa;
struct ccp_passthru_engine passthru;
struct ccp_ecc_engine ecc;
} u;
/* Completion callback support */
void (*callback)(void *data, int err);
void *data;
};
#endif