s390/zcrypt: Add support for CEX4 crypto card (1e2076f4) · Commits · e / devices / android_kernel_oneplus_sm8150

drivers/s390/crypto/Makefile

+1 −1

Original line number	Diff line number	Diff line
		@@ -4,5 +4,5 @@

		ap-objs := ap_bus.o
		obj-$(CONFIG_ZCRYPT) += ap.o zcrypt_api.o zcrypt_pcicc.o zcrypt_pcixcc.o
		obj-$(CONFIG_ZCRYPT) += zcrypt_pcica.o zcrypt_cex2a.o
		obj-$(CONFIG_ZCRYPT) += zcrypt_pcica.o zcrypt_cex2a.o zcrypt_cex4.o
		obj-$(CONFIG_ZCRYPT) += zcrypt_msgtype6.o zcrypt_msgtype50.o

drivers/s390/crypto/ap_bus.c

+7 −15

Original line number	Diff line number	Diff line
		@@ -1340,30 +1340,22 @@ static void ap_scan_bus(struct work_struct *unused)
		(unsigned long) ap_dev);
		switch (device_type) {
		case 0:
		/* device type probing for old cards */
		if (ap_probe_device_type(ap_dev)) {
		kfree(ap_dev);
		continue;
		}
		break;
		case 10:
		if (ap_query_functions(qid, &device_functions)) {
		kfree(ap_dev);
		continue;
		}
		ap_dev->functions = device_functions;
		if (ap_test_bit(&device_functions, 3))
		ap_dev->device_type = AP_DEVICE_TYPE_CEX3C;
		else if (ap_test_bit(&device_functions, 4))
		ap_dev->device_type = AP_DEVICE_TYPE_CEX3A;
		else {
		kfree(ap_dev);
		continue;
		}
		break;
		default:
		ap_dev->device_type = device_type;
		}

		rc = ap_query_functions(qid, &device_functions);
		if (!rc)
		ap_dev->functions = device_functions;
		else
		ap_dev->functions = 0u;

		ap_dev->device.bus = &ap_bus_type;
		ap_dev->device.parent = ap_root_device;
		if (dev_set_name(&ap_dev->device, "card%02x",

drivers/s390/crypto/ap_bus.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -116,6 +116,7 @@ static inline int ap_test_bit(unsigned int *ptr, unsigned int nr)
		#define AP_DEVICE_TYPE_CEX2C 7
		#define AP_DEVICE_TYPE_CEX3A 8
		#define AP_DEVICE_TYPE_CEX3C 9
		#define AP_DEVICE_TYPE_CEX4 10

		/*
		* Known function facilities

drivers/s390/crypto/zcrypt_cex4.c

0 → 100644

+149 −0

Original line number	Diff line number	Diff line
		/*
		* 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 "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_SPEED_RATING 900 /* TODO new card, new speed rating */
		#define CEX4C_SPEED_RATING 6500 /* TODO new card, new speed rating */

		#define CEX4A_MAX_MESSAGE_SIZE MSGTYPE50_CRB3_MAX_MSG_SIZE
		#define CEX4C_MAX_MESSAGE_SIZE MSGTYPE06_MAX_MSG_SIZE

		#define CEX4_CLEANUP_TIME (15*HZ)

		static struct ap_device_id zcrypt_cex4_ids[] = {
		{ AP_DEVICE(AP_DEVICE_TYPE_CEX4) },
		{ /* end of list */ },
		};

		MODULE_DEVICE_TABLE(ap, zcrypt_cex4_ids);
		MODULE_AUTHOR("IBM Corporation");
		MODULE_DESCRIPTION("CEX4 Cryptographic Card device driver, " \
		"Copyright IBM Corp. 2012");
		MODULE_LICENSE("GPL");

		static int zcrypt_cex4_probe(struct ap_device *ap_dev);
		static void zcrypt_cex4_remove(struct ap_device *ap_dev);

		static struct ap_driver zcrypt_cex4_driver = {
		.probe = zcrypt_cex4_probe,
		.remove = zcrypt_cex4_remove,
		.ids = zcrypt_cex4_ids,
		.request_timeout = CEX4_CLEANUP_TIME,
		};

		/**
		* Probe function for CEX4 cards. 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_probe(struct ap_device *ap_dev)
		{
		struct zcrypt_device *zdev = NULL;
		int rc = 0;

		switch (ap_dev->device_type) {
		case AP_DEVICE_TYPE_CEX4:
		if (ap_test_bit(&ap_dev->functions, AP_FUNC_ACCEL)) {
		zdev = zcrypt_device_alloc(CEX4A_MAX_MESSAGE_SIZE);
		if (!zdev)
		return -ENOMEM;
		zdev->type_string = "CEX4A";
		zdev->user_space_type = ZCRYPT_CEX3A;
		zdev->min_mod_size = CEX4A_MIN_MOD_SIZE;
		if (ap_test_bit(&ap_dev->functions, AP_FUNC_MEX4K) &&
		ap_test_bit(&ap_dev->functions, AP_FUNC_CRT4K)) {
		zdev->max_mod_size =
		CEX4A_MAX_MOD_SIZE_4K;
		zdev->max_exp_bit_length =
		CEX4A_MAX_MOD_SIZE_4K;
		} else {
		zdev->max_mod_size =
		CEX4A_MAX_MOD_SIZE_2K;
		zdev->max_exp_bit_length =
		CEX4A_MAX_MOD_SIZE_2K;
		}
		zdev->short_crt = 1;
		zdev->speed_rating = CEX4A_SPEED_RATING;
		zdev->ops = zcrypt_msgtype_request(MSGTYPE50_NAME,
		MSGTYPE50_VARIANT_DEFAULT);
		} else if (ap_test_bit(&ap_dev->functions, AP_FUNC_COPRO)) {
		zdev = zcrypt_device_alloc(CEX4C_MAX_MESSAGE_SIZE);
		if (!zdev)
		return -ENOMEM;
		zdev->type_string = "CEX4C";
		zdev->user_space_type = ZCRYPT_CEX3C;
		zdev->min_mod_size = CEX4C_MIN_MOD_SIZE;
		zdev->max_mod_size = CEX4C_MAX_MOD_SIZE;
		zdev->max_exp_bit_length = CEX4C_MAX_MOD_SIZE;
		zdev->short_crt = 0;
		zdev->speed_rating = CEX4C_SPEED_RATING;
		zdev->ops = zcrypt_msgtype_request(MSGTYPE06_NAME,
		MSGTYPE06_VARIANT_DEFAULT);
		}
		break;
		}
		if (!zdev)
		return -ENODEV;
		zdev->ap_dev = ap_dev;
		zdev->online = 1;
		ap_dev->reply = &zdev->reply;
		ap_dev->private = zdev;
		rc = zcrypt_device_register(zdev);
		if (rc) {
		zcrypt_msgtype_release(zdev->ops);
		ap_dev->private = NULL;
		zcrypt_device_free(zdev);
		}
		return rc;
		}

		/**
		* This is called to remove the extended CEX4 driver information
		* if an AP device is removed.
		*/
		static void zcrypt_cex4_remove(struct ap_device *ap_dev)
		{
		struct zcrypt_device *zdev = ap_dev->private;
		struct zcrypt_ops *zops;

		if (zdev) {
		zops = zdev->ops;
		zcrypt_device_unregister(zdev);
		zcrypt_msgtype_release(zops);
		}
		}

		int __init zcrypt_cex4_init(void)
		{
		return ap_driver_register(&zcrypt_cex4_driver, THIS_MODULE, "cex4");
		}

		void __exit zcrypt_cex4_exit(void)
		{
		ap_driver_unregister(&zcrypt_cex4_driver);
		}

		module_init(zcrypt_cex4_init);
		module_exit(zcrypt_cex4_exit);

drivers/s390/crypto/zcrypt_cex4.h

0 → 100644

+12 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright IBM Corp. 2012
		* Author(s): Holger Dengler <hd@linux.vnet.ibm.com>
		*/

		#ifndef _ZCRYPT_CEX4_H_
		#define _ZCRYPT_CEX4_H_

		int zcrypt_cex4_init(void);
		void zcrypt_cex4_exit(void);

		#endif /* _ZCRYPT_CEX4_H_ */