s390/zcrypt: Add support for CEX4 crypto card

New zcrypt module supports IBM CryptoExpress 4 cards.

Signed-off-by: Holger Dengler <hd@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/drivers/s390/crypto/Makefile b/drivers/s390/crypto/Makefile
index eca0bfa..771faf7 100644 (file)
--- a/drivers/s390/crypto/Makefile
+++ b/drivers/s390/crypto/Makefile
@@ -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

diff --git a/drivers/s390/crypto/ap_bus.c b/drivers/s390/crypto/ap_bus.c
index f0b53ee..39e5eb2 100644 (file)
--- a/drivers/s390/crypto/ap_bus.c
+++ b/drivers/s390/crypto/ap_bus.c
@@ -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",

diff --git a/drivers/s390/crypto/ap_bus.h b/drivers/s390/crypto/ap_bus.h
index e49bcf4..e9b963e 100644 (file)
--- a/drivers/s390/crypto/ap_bus.h
+++ b/drivers/s390/crypto/ap_bus.h
@@ -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

diff --git a/drivers/s390/crypto/zcrypt_cex4.c b/drivers/s390/crypto/zcrypt_cex4.c
new file mode 100644 (file)
index 0000000..ce12263
--- /dev/null
+++ b/drivers/s390/crypto/zcrypt_cex4.c
@@ -0,0 +1,149 @@
+/*
+ *  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);

diff --git a/drivers/s390/crypto/zcrypt_cex4.h b/drivers/s390/crypto/zcrypt_cex4.h
new file mode 100644 (file)
index 0000000..7195713
--- /dev/null
+++ b/drivers/s390/crypto/zcrypt_cex4.h
@@ -0,0 +1,12 @@
+/*
+ *  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_ */