633 lines
14 KiB
C
633 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* AMD Cryptographic Coprocessor (CCP) driver
|
|
*
|
|
* Copyright (C) 2013,2017 Advanced Micro Devices, Inc.
|
|
*
|
|
* Author: Tom Lendacky <thomas.lendacky@amd.com>
|
|
* Author: Gary R Hook <gary.hook@amd.com>
|
|
*/
|
|
|
|
#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/cpu.h>
|
|
#ifdef CONFIG_X86
|
|
#include <asm/cpu_device_id.h>
|
|
#endif
|
|
#include <linux/ccp.h>
|
|
|
|
#include "ccp-dev.h"
|
|
|
|
struct ccp_tasklet_data {
|
|
struct completion completion;
|
|
struct ccp_cmd *cmd;
|
|
};
|
|
|
|
/* Human-readable error strings */
|
|
#define CCP_MAX_ERROR_CODE 64
|
|
static char *ccp_error_codes[] = {
|
|
"",
|
|
"ILLEGAL_ENGINE",
|
|
"ILLEGAL_KEY_ID",
|
|
"ILLEGAL_FUNCTION_TYPE",
|
|
"ILLEGAL_FUNCTION_MODE",
|
|
"ILLEGAL_FUNCTION_ENCRYPT",
|
|
"ILLEGAL_FUNCTION_SIZE",
|
|
"Zlib_MISSING_INIT_EOM",
|
|
"ILLEGAL_FUNCTION_RSVD",
|
|
"ILLEGAL_BUFFER_LENGTH",
|
|
"VLSB_FAULT",
|
|
"ILLEGAL_MEM_ADDR",
|
|
"ILLEGAL_MEM_SEL",
|
|
"ILLEGAL_CONTEXT_ID",
|
|
"ILLEGAL_KEY_ADDR",
|
|
"0xF Reserved",
|
|
"Zlib_ILLEGAL_MULTI_QUEUE",
|
|
"Zlib_ILLEGAL_JOBID_CHANGE",
|
|
"CMD_TIMEOUT",
|
|
"IDMA0_AXI_SLVERR",
|
|
"IDMA0_AXI_DECERR",
|
|
"0x15 Reserved",
|
|
"IDMA1_AXI_SLAVE_FAULT",
|
|
"IDMA1_AIXI_DECERR",
|
|
"0x18 Reserved",
|
|
"ZLIBVHB_AXI_SLVERR",
|
|
"ZLIBVHB_AXI_DECERR",
|
|
"0x1B Reserved",
|
|
"ZLIB_UNEXPECTED_EOM",
|
|
"ZLIB_EXTRA_DATA",
|
|
"ZLIB_BTYPE",
|
|
"ZLIB_UNDEFINED_SYMBOL",
|
|
"ZLIB_UNDEFINED_DISTANCE_S",
|
|
"ZLIB_CODE_LENGTH_SYMBOL",
|
|
"ZLIB _VHB_ILLEGAL_FETCH",
|
|
"ZLIB_UNCOMPRESSED_LEN",
|
|
"ZLIB_LIMIT_REACHED",
|
|
"ZLIB_CHECKSUM_MISMATCH0",
|
|
"ODMA0_AXI_SLVERR",
|
|
"ODMA0_AXI_DECERR",
|
|
"0x28 Reserved",
|
|
"ODMA1_AXI_SLVERR",
|
|
"ODMA1_AXI_DECERR",
|
|
};
|
|
|
|
void ccp_log_error(struct ccp_device *d, unsigned int e)
|
|
{
|
|
if (WARN_ON(e >= CCP_MAX_ERROR_CODE))
|
|
return;
|
|
|
|
if (e < ARRAY_SIZE(ccp_error_codes))
|
|
dev_err(d->dev, "CCP error %d: %s\n", e, ccp_error_codes[e]);
|
|
else
|
|
dev_err(d->dev, "CCP error %d: Unknown Error\n", e);
|
|
}
|
|
|
|
/* List of CCPs, CCP count, read-write access lock, and access functions
|
|
*
|
|
* Lock structure: get ccp_unit_lock for reading whenever we need to
|
|
* examine the CCP list. While holding it for reading we can acquire
|
|
* the RR lock to update the round-robin next-CCP pointer. The unit lock
|
|
* must be acquired before the RR lock.
|
|
*
|
|
* If the unit-lock is acquired for writing, we have total control over
|
|
* the list, so there's no value in getting the RR lock.
|
|
*/
|
|
static DEFINE_RWLOCK(ccp_unit_lock);
|
|
static LIST_HEAD(ccp_units);
|
|
|
|
/* Round-robin counter */
|
|
static DEFINE_SPINLOCK(ccp_rr_lock);
|
|
static struct ccp_device *ccp_rr;
|
|
|
|
/**
|
|
* ccp_add_device - add a CCP device to the list
|
|
*
|
|
* @ccp: ccp_device struct pointer
|
|
*
|
|
* Put this CCP on the unit list, which makes it available
|
|
* for use.
|
|
*
|
|
* Returns zero if a CCP device is present, -ENODEV otherwise.
|
|
*/
|
|
void ccp_add_device(struct ccp_device *ccp)
|
|
{
|
|
unsigned long flags;
|
|
|
|
write_lock_irqsave(&ccp_unit_lock, flags);
|
|
list_add_tail(&ccp->entry, &ccp_units);
|
|
if (!ccp_rr)
|
|
/* We already have the list lock (we're first) so this
|
|
* pointer can't change on us. Set its initial value.
|
|
*/
|
|
ccp_rr = ccp;
|
|
write_unlock_irqrestore(&ccp_unit_lock, flags);
|
|
}
|
|
|
|
/**
|
|
* ccp_del_device - remove a CCP device from the list
|
|
*
|
|
* @ccp: ccp_device struct pointer
|
|
*
|
|
* Remove this unit from the list of devices. If the next device
|
|
* up for use is this one, adjust the pointer. If this is the last
|
|
* device, NULL the pointer.
|
|
*/
|
|
void ccp_del_device(struct ccp_device *ccp)
|
|
{
|
|
unsigned long flags;
|
|
|
|
write_lock_irqsave(&ccp_unit_lock, flags);
|
|
if (ccp_rr == ccp) {
|
|
/* ccp_unit_lock is read/write; any read access
|
|
* will be suspended while we make changes to the
|
|
* list and RR pointer.
|
|
*/
|
|
if (list_is_last(&ccp_rr->entry, &ccp_units))
|
|
ccp_rr = list_first_entry(&ccp_units, struct ccp_device,
|
|
entry);
|
|
else
|
|
ccp_rr = list_next_entry(ccp_rr, entry);
|
|
}
|
|
list_del(&ccp->entry);
|
|
if (list_empty(&ccp_units))
|
|
ccp_rr = NULL;
|
|
write_unlock_irqrestore(&ccp_unit_lock, flags);
|
|
}
|
|
|
|
|
|
|
|
int ccp_register_rng(struct ccp_device *ccp)
|
|
{
|
|
int ret = 0;
|
|
|
|
dev_dbg(ccp->dev, "Registering RNG...\n");
|
|
/* Register an RNG */
|
|
ccp->hwrng.name = ccp->rngname;
|
|
ccp->hwrng.read = ccp_trng_read;
|
|
ret = hwrng_register(&ccp->hwrng);
|
|
if (ret)
|
|
dev_err(ccp->dev, "error registering hwrng (%d)\n", ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
void ccp_unregister_rng(struct ccp_device *ccp)
|
|
{
|
|
if (ccp->hwrng.name)
|
|
hwrng_unregister(&ccp->hwrng);
|
|
}
|
|
|
|
static struct ccp_device *ccp_get_device(void)
|
|
{
|
|
unsigned long flags;
|
|
struct ccp_device *dp = NULL;
|
|
|
|
/* We round-robin through the unit list.
|
|
* The (ccp_rr) pointer refers to the next unit to use.
|
|
*/
|
|
read_lock_irqsave(&ccp_unit_lock, flags);
|
|
if (!list_empty(&ccp_units)) {
|
|
spin_lock(&ccp_rr_lock);
|
|
dp = ccp_rr;
|
|
if (list_is_last(&ccp_rr->entry, &ccp_units))
|
|
ccp_rr = list_first_entry(&ccp_units, struct ccp_device,
|
|
entry);
|
|
else
|
|
ccp_rr = list_next_entry(ccp_rr, entry);
|
|
spin_unlock(&ccp_rr_lock);
|
|
}
|
|
read_unlock_irqrestore(&ccp_unit_lock, flags);
|
|
|
|
return dp;
|
|
}
|
|
|
|
/**
|
|
* ccp_present - check if a CCP device is present
|
|
*
|
|
* Returns zero if a CCP device is present, -ENODEV otherwise.
|
|
*/
|
|
int ccp_present(void)
|
|
{
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
read_lock_irqsave(&ccp_unit_lock, flags);
|
|
ret = list_empty(&ccp_units);
|
|
read_unlock_irqrestore(&ccp_unit_lock, flags);
|
|
|
|
return ret ? -ENODEV : 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ccp_present);
|
|
|
|
/**
|
|
* ccp_version - get the version of the CCP device
|
|
*
|
|
* Returns the version from the first unit on the list;
|
|
* otherwise a zero if no CCP device is present
|
|
*/
|
|
unsigned int ccp_version(void)
|
|
{
|
|
struct ccp_device *dp;
|
|
unsigned long flags;
|
|
int ret = 0;
|
|
|
|
read_lock_irqsave(&ccp_unit_lock, flags);
|
|
if (!list_empty(&ccp_units)) {
|
|
dp = list_first_entry(&ccp_units, struct ccp_device, entry);
|
|
ret = dp->vdata->version;
|
|
}
|
|
read_unlock_irqrestore(&ccp_unit_lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ccp_version);
|
|
|
|
/**
|
|
* 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;
|
|
unsigned long flags;
|
|
unsigned int i;
|
|
int ret;
|
|
|
|
/* Some commands might need to be sent to a specific device */
|
|
ccp = cmd->ccp ? cmd->ccp : ccp_get_device();
|
|
|
|
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) {
|
|
if (cmd->flags & CCP_CMD_MAY_BACKLOG) {
|
|
ret = -EBUSY;
|
|
list_add_tail(&cmd->entry, &ccp->backlog);
|
|
} else {
|
|
ret = -ENOSPC;
|
|
}
|
|
} 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(unsigned long data)
|
|
{
|
|
struct ccp_tasklet_data *tdata = (struct ccp_tasklet_data *)data;
|
|
struct ccp_cmd *cmd = tdata->cmd;
|
|
|
|
cmd->callback(cmd->data, cmd->ret);
|
|
|
|
complete(&tdata->completion);
|
|
}
|
|
|
|
/**
|
|
* ccp_cmd_queue_thread - create a kernel thread to manage a CCP queue
|
|
*
|
|
* @data: thread-specific data
|
|
*/
|
|
int ccp_cmd_queue_thread(void *data)
|
|
{
|
|
struct ccp_cmd_queue *cmd_q = (struct ccp_cmd_queue *)data;
|
|
struct ccp_cmd *cmd;
|
|
struct ccp_tasklet_data tdata;
|
|
struct tasklet_struct tasklet;
|
|
|
|
tasklet_init(&tasklet, ccp_do_cmd_complete, (unsigned long)&tdata);
|
|
|
|
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 */
|
|
tdata.cmd = cmd;
|
|
init_completion(&tdata.completion);
|
|
tasklet_schedule(&tasklet);
|
|
wait_for_completion(&tdata.completion);
|
|
}
|
|
|
|
__set_current_state(TASK_RUNNING);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ccp_alloc_struct - allocate and initialize the ccp_device struct
|
|
*
|
|
* @dev: device struct of the CCP
|
|
*/
|
|
struct ccp_device *ccp_alloc_struct(struct sp_device *sp)
|
|
{
|
|
struct device *dev = sp->dev;
|
|
struct ccp_device *ccp;
|
|
|
|
ccp = devm_kzalloc(dev, sizeof(*ccp), GFP_KERNEL);
|
|
if (!ccp)
|
|
return NULL;
|
|
ccp->dev = dev;
|
|
ccp->sp = sp;
|
|
ccp->axcache = sp->axcache;
|
|
|
|
INIT_LIST_HEAD(&ccp->cmd);
|
|
INIT_LIST_HEAD(&ccp->backlog);
|
|
|
|
spin_lock_init(&ccp->cmd_lock);
|
|
mutex_init(&ccp->req_mutex);
|
|
mutex_init(&ccp->sb_mutex);
|
|
ccp->sb_count = KSB_COUNT;
|
|
ccp->sb_start = 0;
|
|
|
|
/* Initialize the wait queues */
|
|
init_waitqueue_head(&ccp->sb_queue);
|
|
init_waitqueue_head(&ccp->suspend_queue);
|
|
|
|
snprintf(ccp->name, MAX_CCP_NAME_LEN, "ccp-%u", sp->ord);
|
|
snprintf(ccp->rngname, MAX_CCP_NAME_LEN, "ccp-%u-rng", sp->ord);
|
|
|
|
return ccp;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
#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;
|
|
}
|
|
|
|
int ccp_dev_suspend(struct sp_device *sp, pm_message_t state)
|
|
{
|
|
struct ccp_device *ccp = sp->ccp_data;
|
|
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;
|
|
}
|
|
|
|
int ccp_dev_resume(struct sp_device *sp)
|
|
{
|
|
struct ccp_device *ccp = sp->ccp_data;
|
|
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
|
|
|
|
int ccp_dev_init(struct sp_device *sp)
|
|
{
|
|
struct device *dev = sp->dev;
|
|
struct ccp_device *ccp;
|
|
int ret;
|
|
|
|
ret = -ENOMEM;
|
|
ccp = ccp_alloc_struct(sp);
|
|
if (!ccp)
|
|
goto e_err;
|
|
sp->ccp_data = ccp;
|
|
|
|
ccp->vdata = (struct ccp_vdata *)sp->dev_vdata->ccp_vdata;
|
|
if (!ccp->vdata || !ccp->vdata->version) {
|
|
ret = -ENODEV;
|
|
dev_err(dev, "missing driver data\n");
|
|
goto e_err;
|
|
}
|
|
|
|
ccp->use_tasklet = sp->use_tasklet;
|
|
|
|
ccp->io_regs = sp->io_map + ccp->vdata->offset;
|
|
if (ccp->vdata->setup)
|
|
ccp->vdata->setup(ccp);
|
|
|
|
ret = ccp->vdata->perform->init(ccp);
|
|
if (ret)
|
|
goto e_err;
|
|
|
|
dev_notice(dev, "ccp enabled\n");
|
|
|
|
return 0;
|
|
|
|
e_err:
|
|
sp->ccp_data = NULL;
|
|
|
|
dev_notice(dev, "ccp initialization failed\n");
|
|
|
|
return ret;
|
|
}
|
|
|
|
void ccp_dev_destroy(struct sp_device *sp)
|
|
{
|
|
struct ccp_device *ccp = sp->ccp_data;
|
|
|
|
if (!ccp)
|
|
return;
|
|
|
|
ccp->vdata->perform->destroy(ccp);
|
|
}
|