[PATCH] s390: add support for cex2a crypto cards

Signed-off-by: Eric Rossman <edrossma@us.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 76 insertions, 35 deletions

diff --git a/drivers/s390/crypto/z90main.c b/drivers/s390/crypto/z90main.c
index 790fcbb74b43..135ae04e6e75 100644
--- a/drivers/s390/crypto/z90main.c
+++ b/drivers/s390/crypto/z90main.c
@@ -228,7 +228,7 @@ struct device_x {
  */
 struct device {
         int              dev_type;          // PCICA, PCICC, PCIXCC_MCL2,
-                                            // PCIXCC_MCL3, CEX2C
+                                            // PCIXCC_MCL3, CEX2C, CEX2A
         enum devstat     dev_stat;          // current device status
         int              dev_self_x;        // Index in array
         int              disabled;          // Set when device is in error
@@ -295,26 +295,30 @@ struct caller {
 /**
  * Function prototypes from z90hardware.c
  */
-enum hdstat query_online(int, int, int, int *, int *);
-enum devstat reset_device(int, int, int);
-enum devstat send_to_AP(int, int, int, unsigned char *);
-enum devstat receive_from_AP(int, int, int, unsigned char *, unsigned char *);
-int convert_request(unsigned char *, int, short, int, int, int *,
-                    unsigned char *);
-int convert_response(unsigned char *, unsigned char *, int *, unsigned char *);
+enum hdstat query_online(int deviceNr, int cdx, int resetNr, int *q_depth,
+                         int *dev_type);
+enum devstat reset_device(int deviceNr, int cdx, int resetNr);
+enum devstat send_to_AP(int dev_nr, int cdx, int msg_len, unsigned char *msg_ext);
+enum devstat receive_from_AP(int dev_nr, int cdx, int resplen,
+                             unsigned char *resp, unsigned char *psmid);
+int convert_request(unsigned char *buffer, int func, unsigned short function,
+                    int cdx, int dev_type, int *msg_l_p, unsigned char *msg_p);
+int convert_response(unsigned char *response, unsigned char *buffer,
+                     int *respbufflen_p, unsigned char *resp_buff);
 
 /**
  * Low level function prototypes
  */
-static int create_z90crypt(int *);
-static int refresh_z90crypt(int *);
-static int find_crypto_devices(struct status *);
-static int create_crypto_device(int);
-static int destroy_crypto_device(int);
+static int create_z90crypt(int *cdx_p);
+static int refresh_z90crypt(int *cdx_p);
+static int find_crypto_devices(struct status *deviceMask);
+static int create_crypto_device(int index);
+static int destroy_crypto_device(int index);
 static void destroy_z90crypt(void);
-static int refresh_index_array(struct status *, struct device_x *);
-static int probe_device_type(struct device *);
-static int probe_PCIXCC_type(struct device *);
+static int refresh_index_array(struct status *status_str,
+                               struct device_x *index_array);
+static int probe_device_type(struct device *devPtr);
+static int probe_PCIXCC_type(struct device *devPtr);
 
 /**
  * proc fs definitions
@@ -425,7 +429,7 @@ static struct miscdevice z90crypt_misc_device = {
 MODULE_AUTHOR("zSeries Linux Crypto Team: Robert H. Burroughs, Eric D. Rossman"
               "and Jochen Roehrig");
 MODULE_DESCRIPTION("zSeries Linux Cryptographic Coprocessor device driver, "
-                   "Copyright 2001, 2004 IBM Corporation");
+                   "Copyright 2001, 2005 IBM Corporation");
 MODULE_LICENSE("GPL");
 module_param(domain, int, 0);
 MODULE_PARM_DESC(domain, "domain index for device");
@@ -860,6 +864,12 @@ get_status_CEX2Ccount(void)
 }
 
 static inline int
+get_status_CEX2Acount(void)
+{
+        return z90crypt.hdware_info->type_mask[CEX2A].st_count;
+}
+
+static inline int
 get_status_requestq_count(void)
 {
         return requestq_count;
@@ -1008,11 +1018,13 @@ static inline int
 select_device_type(int *dev_type_p, int bytelength)
 {
         static int count = 0;
-        int PCICA_avail, PCIXCC_MCL3_avail, CEX2C_avail, index_to_use;
+        int PCICA_avail, PCIXCC_MCL3_avail, CEX2C_avail, CEX2A_avail,
+            index_to_use;
         struct status *stat;
         if ((*dev_type_p != PCICC) && (*dev_type_p != PCICA) &&
             (*dev_type_p != PCIXCC_MCL2) && (*dev_type_p != PCIXCC_MCL3) &&
-            (*dev_type_p != CEX2C) && (*dev_type_p != ANYDEV))
+            (*dev_type_p != CEX2C) && (*dev_type_p != CEX2A) &&
+            (*dev_type_p != ANYDEV))
                 return -1;
         if (*dev_type_p != ANYDEV) {
                 stat = &z90crypt.hdware_info->type_mask[*dev_type_p];
@@ -1022,7 +1034,13 @@ select_device_type(int *dev_type_p, int bytelength)
                 return -1;
         }
 
-        /* Assumption: PCICA, PCIXCC_MCL3, and CEX2C are all similar in speed */
+        /**
+         * Assumption: PCICA, PCIXCC_MCL3, CEX2C, and CEX2A are all similar in
+         * speed.
+         *
+         * PCICA and CEX2A do NOT co-exist, so it would be either one or the
+         * other present.
+         */
         stat = &z90crypt.hdware_info->type_mask[PCICA];
         PCICA_avail = stat->st_count -
                         (stat->disabled_count + stat->user_disabled_count);
@@ -1032,29 +1050,38 @@ select_device_type(int *dev_type_p, int bytelength)
         stat = &z90crypt.hdware_info->type_mask[CEX2C];
         CEX2C_avail = stat->st_count -
                         (stat->disabled_count + stat->user_disabled_count);
-        if (PCICA_avail || PCIXCC_MCL3_avail || CEX2C_avail) {
+        stat = &z90crypt.hdware_info->type_mask[CEX2A];
+        CEX2A_avail = stat->st_count -
+                        (stat->disabled_count + stat->user_disabled_count);
+        if (PCICA_avail || PCIXCC_MCL3_avail || CEX2C_avail || CEX2A_avail) {
                 /**
-                 * bitlength is a factor, PCICA is the most capable, even with
-                 * the new MCL for PCIXCC.
+                 * bitlength is a factor, PCICA or CEX2A are the most capable,
+                 * even with the new MCL for PCIXCC.
                  */
                 if ((bytelength < PCIXCC_MIN_MOD_SIZE) ||
                     (!ext_bitlens && (bytelength < OLD_PCIXCC_MIN_MOD_SIZE))) {
-                        if (!PCICA_avail)
-                                return -1;
-                        else {
+                        if (PCICA_avail) {
                                 *dev_type_p = PCICA;
                                 return 0;
                         }
+                        if (CEX2A_avail) {
+                                *dev_type_p = CEX2A;
+                                return 0;
+                        }
+                        return -1;
                 }
 
                 index_to_use = count % (PCICA_avail + PCIXCC_MCL3_avail +
-                                        CEX2C_avail);
+                                        CEX2C_avail + CEX2A_avail);
                 if (index_to_use < PCICA_avail)
                         *dev_type_p = PCICA;
                 else if (index_to_use < (PCICA_avail + PCIXCC_MCL3_avail))
                         *dev_type_p = PCIXCC_MCL3;
-                else
+                else if (index_to_use < (PCICA_avail + PCIXCC_MCL3_avail +
+                                         CEX2C_avail))
                         *dev_type_p = CEX2C;
+                else
+                        *dev_type_p = CEX2A;
                 count++;
                 return 0;
         }
@@ -1359,7 +1386,7 @@ build_caller(struct work_element *we_p, short function)
 
         if ((we_p->devtype != PCICC) && (we_p->devtype != PCICA) &&
             (we_p->devtype != PCIXCC_MCL2) && (we_p->devtype != PCIXCC_MCL3) &&
-            (we_p->devtype != CEX2C))
+            (we_p->devtype != CEX2C) && (we_p->devtype != CEX2A))
                 return SEN_NOT_AVAIL;
 
         memcpy(caller_p->caller_id, we_p->caller_id,
@@ -1428,7 +1455,8 @@ get_crypto_request_buffer(struct work_element *we_p)
 
         if ((we_p->devtype != PCICA) && (we_p->devtype != PCICC) &&
             (we_p->devtype != PCIXCC_MCL2) && (we_p->devtype != PCIXCC_MCL3) &&
-            (we_p->devtype != CEX2C) && (we_p->devtype != ANYDEV)) {
+            (we_p->devtype != CEX2C) && (we_p->devtype != CEX2A) &&
+            (we_p->devtype != ANYDEV)) {
                 PRINTK("invalid device type\n");
                 return SEN_USER_ERROR;
         }
@@ -1503,8 +1531,9 @@ get_crypto_request_buffer(struct work_element *we_p)
 
         function = PCI_FUNC_KEY_ENCRYPT;
         switch (we_p->devtype) {
-        /* PCICA does everything with a simple RSA mod-expo operation */
+        /* PCICA and CEX2A do everything with a simple RSA mod-expo operation */
         case PCICA:
+        case CEX2A:
                 function = PCI_FUNC_KEY_ENCRYPT;
                 break;
         /**
@@ -1662,7 +1691,8 @@ z90crypt_rsa(struct priv_data *private_data_p, pid_t pid,
                  * trigger a fallback to software.
                  */
                 case -EINVAL:
-                        if (we_p->devtype != PCICA)
+                        if ((we_p->devtype != PCICA) &&
+                            (we_p->devtype != CEX2A))
                                 rv = -EGETBUFF;
                         break;
                 case -ETIMEOUT:
@@ -1779,6 +1809,12 @@ z90crypt_unlocked_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
                         ret = -EFAULT;
                 break;
 
+        case Z90STAT_CEX2ACOUNT:
+                tempstat = get_status_CEX2Acount();
+                if (copy_to_user((int __user *)arg, &tempstat, sizeof(int)) != 0)
+                        ret = -EFAULT;
+                break;
+
         case Z90STAT_REQUESTQ_COUNT:
                 tempstat = get_status_requestq_count();
                 if (copy_to_user((int __user *)arg, &tempstat, sizeof(int)) != 0)
@@ -2019,6 +2055,8 @@ z90crypt_status(char *resp_buff, char **start, off_t offset,
                 get_status_PCIXCCMCL3count());
         len += sprintf(resp_buff+len, "CEX2C count: %d\n",
                 get_status_CEX2Ccount());
+        len += sprintf(resp_buff+len, "CEX2A count: %d\n",
+                get_status_CEX2Acount());
         len += sprintf(resp_buff+len, "requestq count: %d\n",
                 get_status_requestq_count());
         len += sprintf(resp_buff+len, "pendingq count: %d\n",
@@ -2026,8 +2064,8 @@ z90crypt_status(char *resp_buff, char **start, off_t offset,
         len += sprintf(resp_buff+len, "Total open handles: %d\n\n",
                 get_status_totalopen_count());
         len += sprinthx(
-                "Online devices: 1: PCICA, 2: PCICC, 3: PCIXCC (MCL2), "
-                "4: PCIXCC (MCL3), 5: CEX2C",
+                "Online devices: 1=PCICA 2=PCICC 3=PCIXCC(MCL2) "
+                "4=PCIXCC(MCL3) 5=CEX2C 6=CEX2A",
                 resp_buff+len,
                 get_status_status_mask(workarea),
                 Z90CRYPT_NUM_APS);
@@ -2140,6 +2178,7 @@ z90crypt_status_write(struct file *file, const char __user *buffer,
                 case '3':       // PCIXCC_MCL2
                 case '4':       // PCIXCC_MCL3
                 case '5':       // CEX2C
+                case '6':       // CEX2A
                         j++;
                         break;
                 case 'd':
@@ -3007,7 +3046,9 @@ create_crypto_device(int index)
                         z90crypt.hdware_info->device_type_array[index] = 4;
                 else if (deviceType == CEX2C)
                         z90crypt.hdware_info->device_type_array[index] = 5;
-                else
+                else if (deviceType == CEX2A)
+                        z90crypt.hdware_info->device_type_array[index] = 6;
+                else // No idea how this would happen.
                         z90crypt.hdware_info->device_type_array[index] = -1;
         }