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linux-next/drivers/s390/crypto/zcrypt_cex4.c
Harald Freudenberger 104f708fd1 s390/zcrypt: reinit ap queue state machine during device probe 
Until the vfio-ap driver came into live there was a well known
agreement about the way how ap devices are initialized and their
states when the driver's probe function is called.

However, the vfio device driver when receiving an ap queue device does
additional resets thereby removing the registration for interrupts for
the ap device done by the ap bus core code. So when later the vfio
driver releases the device and one of the default zcrypt drivers takes
care of the device the interrupt registration needs to get
renewed. The current code does no renew and result is that requests
send into such a queue will never see a reply processed - the
application hangs.

This patch adds a function which resets the aq queue state machine for
the ap queue device and triggers the walk through the initial states
(which are reset and registration for interrupts). This function is
now called before the driver's probe function is invoked.

When the association between driver and device is released, the
driver's remove function is called. The current implementation calls a
ap queue function ap_queue_remove(). This invokation has been moved to
the ap bus function to make the probe / remove pair for ap bus and
drivers more symmetric.

Fixes: 7e0bdbe5c2 ("s390/zcrypt: AP bus support for alternate driver(s)")
Cc: stable@vger.kernel.org # 4.19+
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Reviewd-by: Tony Krowiak <akrowiak@linux.ibm.com>
Reviewd-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2018-11-27 10:43:35 +01:00

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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright IBM Corp. 2012
* Author(s): Holger Dengler <hd@linux.vnet.ibm.com>
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/atomic.h>
#include <linux/uaccess.h>
#include <linux/mod_devicetable.h>
#include "ap_bus.h"
#include "zcrypt_api.h"
#include "zcrypt_msgtype6.h"
#include "zcrypt_msgtype50.h"
#include "zcrypt_error.h"
#include "zcrypt_cex4.h"
#define CEX4A_MIN_MOD_SIZE 1 /* 8 bits */
#define CEX4A_MAX_MOD_SIZE_2K 256 /* 2048 bits */
#define CEX4A_MAX_MOD_SIZE_4K 512 /* 4096 bits */
#define CEX4C_MIN_MOD_SIZE 16 /* 256 bits */
#define CEX4C_MAX_MOD_SIZE 512 /* 4096 bits */
#define CEX4A_MAX_MESSAGE_SIZE MSGTYPE50_CRB3_MAX_MSG_SIZE
#define CEX4C_MAX_MESSAGE_SIZE MSGTYPE06_MAX_MSG_SIZE
/* Waiting time for requests to be processed.
* Currently there are some types of request which are not deterministic.
* But the maximum time limit managed by the stomper code is set to 60sec.
* Hence we have to wait at least that time period.
*/
#define CEX4_CLEANUP_TIME (900*HZ)
MODULE_AUTHOR("IBM Corporation");
MODULE_DESCRIPTION("CEX4/CEX5/CEX6 Cryptographic Card device driver, " \
"Copyright IBM Corp. 2018");
MODULE_LICENSE("GPL");
static struct ap_device_id zcrypt_cex4_card_ids[] = {
{ .dev_type = AP_DEVICE_TYPE_CEX4,
.match_flags = AP_DEVICE_ID_MATCH_CARD_TYPE },
{ .dev_type = AP_DEVICE_TYPE_CEX5,
.match_flags = AP_DEVICE_ID_MATCH_CARD_TYPE },
{ .dev_type = AP_DEVICE_TYPE_CEX6,
.match_flags = AP_DEVICE_ID_MATCH_CARD_TYPE },
{ /* end of list */ },
};
MODULE_DEVICE_TABLE(ap, zcrypt_cex4_card_ids);
static struct ap_device_id zcrypt_cex4_queue_ids[] = {
{ .dev_type = AP_DEVICE_TYPE_CEX4,
.match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
{ .dev_type = AP_DEVICE_TYPE_CEX5,
.match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
{ .dev_type = AP_DEVICE_TYPE_CEX6,
.match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
{ /* end of list */ },
};
MODULE_DEVICE_TABLE(ap, zcrypt_cex4_queue_ids);
/**
* Probe function for CEX4/CEX5/CEX6 card device. It always
* accepts the AP device since the bus_match already checked
* the hardware type.
* @ap_dev: pointer to the AP device.
*/
static int zcrypt_cex4_card_probe(struct ap_device *ap_dev)
{
/*
* Normalized speed ratings per crypto adapter
* MEX_1k, MEX_2k, MEX_4k, CRT_1k, CRT_2k, CRT_4k, RNG, SECKEY
*/
static const int CEX4A_SPEED_IDX[] = {
14, 19, 249, 42, 228, 1458, 0, 0};
static const int CEX5A_SPEED_IDX[] = {
8, 9, 20, 18, 66, 458, 0, 0};
static const int CEX6A_SPEED_IDX[] = {
6, 9, 20, 17, 65, 438, 0, 0};
static const int CEX4C_SPEED_IDX[] = {
59, 69, 308, 83, 278, 2204, 209, 40};
static const int CEX5C_SPEED_IDX[] = {
24, 31, 50, 37, 90, 479, 27, 10};
static const int CEX6C_SPEED_IDX[] = {
16, 20, 32, 27, 77, 455, 23, 9};
static const int CEX4P_SPEED_IDX[] = {
224, 313, 3560, 359, 605, 2827, 0, 50};
static const int CEX5P_SPEED_IDX[] = {
63, 84, 156, 83, 142, 533, 0, 10};
static const int CEX6P_SPEED_IDX[] = {
55, 70, 121, 73, 129, 522, 0, 9};
struct ap_card *ac = to_ap_card(&ap_dev->device);
struct zcrypt_card *zc;
int rc = 0;
zc = zcrypt_card_alloc();
if (!zc)
return -ENOMEM;
zc->card = ac;
ac->private = zc;
if (ap_test_bit(&ac->functions, AP_FUNC_ACCEL)) {
if (ac->ap_dev.device_type == AP_DEVICE_TYPE_CEX4) {
zc->type_string = "CEX4A";
zc->user_space_type = ZCRYPT_CEX4;
memcpy(zc->speed_rating, CEX4A_SPEED_IDX,
sizeof(CEX4A_SPEED_IDX));
} else if (ac->ap_dev.device_type == AP_DEVICE_TYPE_CEX5) {
zc->type_string = "CEX5A";
zc->user_space_type = ZCRYPT_CEX5;
memcpy(zc->speed_rating, CEX5A_SPEED_IDX,
sizeof(CEX5A_SPEED_IDX));
} else {
zc->type_string = "CEX6A";
zc->user_space_type = ZCRYPT_CEX6;
memcpy(zc->speed_rating, CEX6A_SPEED_IDX,
sizeof(CEX6A_SPEED_IDX));
}
zc->min_mod_size = CEX4A_MIN_MOD_SIZE;
if (ap_test_bit(&ac->functions, AP_FUNC_MEX4K) &&
ap_test_bit(&ac->functions, AP_FUNC_CRT4K)) {
zc->max_mod_size = CEX4A_MAX_MOD_SIZE_4K;
zc->max_exp_bit_length =
CEX4A_MAX_MOD_SIZE_4K;
} else {
zc->max_mod_size = CEX4A_MAX_MOD_SIZE_2K;
zc->max_exp_bit_length =
CEX4A_MAX_MOD_SIZE_2K;
}
} else if (ap_test_bit(&ac->functions, AP_FUNC_COPRO)) {
if (ac->ap_dev.device_type == AP_DEVICE_TYPE_CEX4) {
zc->type_string = "CEX4C";
/* wrong user space type, must be CEX4
* just keep it for cca compatibility
*/
zc->user_space_type = ZCRYPT_CEX3C;
memcpy(zc->speed_rating, CEX4C_SPEED_IDX,
sizeof(CEX4C_SPEED_IDX));
} else if (ac->ap_dev.device_type == AP_DEVICE_TYPE_CEX5) {
zc->type_string = "CEX5C";
/* wrong user space type, must be CEX5
* just keep it for cca compatibility
*/
zc->user_space_type = ZCRYPT_CEX3C;
memcpy(zc->speed_rating, CEX5C_SPEED_IDX,
sizeof(CEX5C_SPEED_IDX));
} else {
zc->type_string = "CEX6C";
/* wrong user space type, must be CEX6
* just keep it for cca compatibility
*/
zc->user_space_type = ZCRYPT_CEX3C;
memcpy(zc->speed_rating, CEX6C_SPEED_IDX,
sizeof(CEX6C_SPEED_IDX));
}
zc->min_mod_size = CEX4C_MIN_MOD_SIZE;
zc->max_mod_size = CEX4C_MAX_MOD_SIZE;
zc->max_exp_bit_length = CEX4C_MAX_MOD_SIZE;
} else if (ap_test_bit(&ac->functions, AP_FUNC_EP11)) {
if (ac->ap_dev.device_type == AP_DEVICE_TYPE_CEX4) {
zc->type_string = "CEX4P";
zc->user_space_type = ZCRYPT_CEX4;
memcpy(zc->speed_rating, CEX4P_SPEED_IDX,
sizeof(CEX4P_SPEED_IDX));
} else if (ac->ap_dev.device_type == AP_DEVICE_TYPE_CEX5) {
zc->type_string = "CEX5P";
zc->user_space_type = ZCRYPT_CEX5;
memcpy(zc->speed_rating, CEX5P_SPEED_IDX,
sizeof(CEX5P_SPEED_IDX));
} else {
zc->type_string = "CEX6P";
zc->user_space_type = ZCRYPT_CEX6;
memcpy(zc->speed_rating, CEX6P_SPEED_IDX,
sizeof(CEX6P_SPEED_IDX));
}
zc->min_mod_size = CEX4C_MIN_MOD_SIZE;
zc->max_mod_size = CEX4C_MAX_MOD_SIZE;
zc->max_exp_bit_length = CEX4C_MAX_MOD_SIZE;
} else {
zcrypt_card_free(zc);
return -ENODEV;
}
zc->online = 1;
rc = zcrypt_card_register(zc);
if (rc) {
ac->private = NULL;
zcrypt_card_free(zc);
}
return rc;
}
/**
* This is called to remove the CEX4/CEX5/CEX6 card driver information
* if an AP card device is removed.
*/
static void zcrypt_cex4_card_remove(struct ap_device *ap_dev)
{
struct zcrypt_card *zc = to_ap_card(&ap_dev->device)->private;
if (zc)
zcrypt_card_unregister(zc);
}
static struct ap_driver zcrypt_cex4_card_driver = {
.probe = zcrypt_cex4_card_probe,
.remove = zcrypt_cex4_card_remove,
.ids = zcrypt_cex4_card_ids,
.flags = AP_DRIVER_FLAG_DEFAULT,
};
/**
* Probe function for CEX4/CEX5/CEX6 queue device. It always
* accepts the AP device since the bus_match already checked
* the hardware type.
* @ap_dev: pointer to the AP device.
*/
static int zcrypt_cex4_queue_probe(struct ap_device *ap_dev)
{
struct ap_queue *aq = to_ap_queue(&ap_dev->device);
struct zcrypt_queue *zq;
int rc;
if (ap_test_bit(&aq->card->functions, AP_FUNC_ACCEL)) {
zq = zcrypt_queue_alloc(CEX4A_MAX_MESSAGE_SIZE);
if (!zq)
return -ENOMEM;
zq->ops = zcrypt_msgtype(MSGTYPE50_NAME,
MSGTYPE50_VARIANT_DEFAULT);
} else if (ap_test_bit(&aq->card->functions, AP_FUNC_COPRO)) {
zq = zcrypt_queue_alloc(CEX4C_MAX_MESSAGE_SIZE);
if (!zq)
return -ENOMEM;
zq->ops = zcrypt_msgtype(MSGTYPE06_NAME,
MSGTYPE06_VARIANT_DEFAULT);
} else if (ap_test_bit(&aq->card->functions, AP_FUNC_EP11)) {
zq = zcrypt_queue_alloc(CEX4C_MAX_MESSAGE_SIZE);
if (!zq)
return -ENOMEM;
zq->ops = zcrypt_msgtype(MSGTYPE06_NAME,
MSGTYPE06_VARIANT_EP11);
} else {
return -ENODEV;
}
zq->queue = aq;
zq->online = 1;
atomic_set(&zq->load, 0);
ap_queue_init_reply(aq, &zq->reply);
aq->request_timeout = CEX4_CLEANUP_TIME,
aq->private = zq;
rc = zcrypt_queue_register(zq);
if (rc) {
aq->private = NULL;
zcrypt_queue_free(zq);
}
return rc;
}
/**
* This is called to remove the CEX4/CEX5/CEX6 queue driver
* information if an AP queue device is removed.
*/
static void zcrypt_cex4_queue_remove(struct ap_device *ap_dev)
{
struct ap_queue *aq = to_ap_queue(&ap_dev->device);
struct zcrypt_queue *zq = aq->private;
if (zq)
zcrypt_queue_unregister(zq);
}
static struct ap_driver zcrypt_cex4_queue_driver = {
.probe = zcrypt_cex4_queue_probe,
.remove = zcrypt_cex4_queue_remove,
.suspend = ap_queue_suspend,
.resume = ap_queue_resume,
.ids = zcrypt_cex4_queue_ids,
.flags = AP_DRIVER_FLAG_DEFAULT,
};
int __init zcrypt_cex4_init(void)
{
int rc;
rc = ap_driver_register(&zcrypt_cex4_card_driver,
THIS_MODULE, "cex4card");
if (rc)
return rc;
rc = ap_driver_register(&zcrypt_cex4_queue_driver,
THIS_MODULE, "cex4queue");
if (rc)
ap_driver_unregister(&zcrypt_cex4_card_driver);
return rc;
}
void __exit zcrypt_cex4_exit(void)
{
ap_driver_unregister(&zcrypt_cex4_queue_driver);
ap_driver_unregister(&zcrypt_cex4_card_driver);
}
module_init(zcrypt_cex4_init);
module_exit(zcrypt_cex4_exit);
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