[S390] ap: toleration support for ap device type 10

Add toleration support for ap devices with device type 10.

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

2 files changed, 91 insertions, 27 deletions

diff --git a/drivers/s390/crypto/ap_bus.c b/drivers/s390/crypto/ap_bus.c
index 16e4a25596e7..f8134a44cefa 100644
--- a/drivers/s390/crypto/ap_bus.c
+++ b/drivers/s390/crypto/ap_bus.c
@@ -6,6 +6,7 @@
  *            Martin Schwidefsky <schwidefsky@de.ibm.com>
  *            Ralph Wuerthner <rwuerthn@de.ibm.com>
  *            Felix Beck <felix.beck@de.ibm.com>
+ *            Holger Dengler <hd@linux.vnet.ibm.com>
  *
  * Adjunct processor bus.
  *
@@ -222,47 +223,52 @@ ap_queue_interruption_control(ap_qid_t qid, void *ind)
 }
 #endif
 
-static inline struct ap_queue_status __ap_4096_commands_available(ap_qid_t qid,
-                                                                  int *support)
+#ifdef CONFIG_64BIT
+static inline struct ap_queue_status
+__ap_query_functions(ap_qid_t qid, unsigned int *functions)
 {
         register unsigned long reg0 asm ("0") = 0UL | qid | (1UL << 23);
-        register struct ap_queue_status reg1 asm ("1");
-        register unsigned long reg2 asm ("2") = 0UL;
+        register struct ap_queue_status reg1 asm ("1") = AP_QUEUE_STATUS_INVALID;
+        register unsigned long reg2 asm ("2");
 
         asm volatile(
                 ".long 0xb2af0000\n"
-                "0: la    %1,0\n"
-                "1:\n"
-                EX_TABLE(0b, 1b)
-                : "+d" (reg0), "=d" (reg1), "=d" (reg2)
+                "0:\n"
+                EX_TABLE(0b, 0b)
+                : "+d" (reg0), "+d" (reg1), "=d" (reg2)
                 :
                 : "cc");
 
-        if (reg2 & 0x6000000000000000ULL)
-                *support = 1;
-        else
-                *support = 0;
-
+        *functions = (unsigned int)(reg2 >> 32);
         return reg1;
 }
+#endif
 
 /**
- * ap_4096_commands_availablen(): Check for availability of 4096 bit RSA
- * support.
+ * ap_query_functions(): Query supported functions.
  * @qid: The AP queue number
+ * @functions: Pointer to functions field.
  *
- * Returns 1 if 4096 bit RSA keys are support fo the AP, returns 0 if not.
+ * Returns
+ *   0       on success.
+ *   -ENODEV  if queue not valid.
+ *   -EBUSY   if device busy.
+ *   -EINVAL  if query function is not supported
  */
-int ap_4096_commands_available(ap_qid_t qid)
+static int ap_query_functions(ap_qid_t qid, unsigned int *functions)
 {
+#ifdef CONFIG_64BIT
         struct ap_queue_status status;
-        int i, support = 0;
-        status = __ap_4096_commands_available(qid, &support);
+        int i;
+        status = __ap_query_functions(qid, functions);
 
         for (i = 0; i < AP_MAX_RESET; i++) {
+                if (ap_queue_status_invalid_test(&status))
+                        return -ENODEV;
+
                 switch (status.response_code) {
                 case AP_RESPONSE_NORMAL:
-                        return support;
+                        return 0;
                 case AP_RESPONSE_RESET_IN_PROGRESS:
                 case AP_RESPONSE_BUSY:
                         break;
@@ -270,7 +276,7 @@ int ap_4096_commands_available(ap_qid_t qid)
                 case AP_RESPONSE_DECONFIGURED:
                 case AP_RESPONSE_CHECKSTOPPED:
                 case AP_RESPONSE_INVALID_ADDRESS:
-                        return 0;
+                        return -ENODEV;
                 case AP_RESPONSE_OTHERWISE_CHANGED:
                         break;
                 default:
@@ -278,10 +284,31 @@ int ap_4096_commands_available(ap_qid_t qid)
                 }
                 if (i < AP_MAX_RESET - 1) {
                         udelay(5);
-                        status = __ap_4096_commands_available(qid, &support);
+                        status = __ap_query_functions(qid, functions);
                 }
         }
-        return support;
+        return -EBUSY;
+#else
+        return -EINVAL;
+#endif
+}
+
+/**
+ * ap_4096_commands_availablen(): Check for availability of 4096 bit RSA
+ * support.
+ * @qid: The AP queue number
+ *
+ * Returns 1 if 4096 bit RSA keys are support fo the AP, returns 0 if not.
+ */
+int ap_4096_commands_available(ap_qid_t qid)
+{
+        unsigned int functions;
+
+        if (ap_query_functions(qid, &functions))
+                return 0;
+
+        return test_ap_facility(functions, 1) &&
+               test_ap_facility(functions, 2);
 }
 EXPORT_SYMBOL(ap_4096_commands_available);
 
@@ -1135,6 +1162,7 @@ static void ap_scan_bus(struct work_struct *unused)
         struct device *dev;
         ap_qid_t qid;
         int queue_depth, device_type;
+        unsigned int device_functions;
         int rc, i;
 
         if (ap_select_domain() != 0)
@@ -1183,14 +1211,30 @@ static void ap_scan_bus(struct work_struct *unused)
                 INIT_LIST_HEAD(&ap_dev->list);
                 setup_timer(&ap_dev->timeout, ap_request_timeout,
                             (unsigned long) ap_dev);
-                if (device_type == 0) {
+                switch (device_type) {
+                case 0:
                         if (ap_probe_device_type(ap_dev)) {
                                 kfree(ap_dev);
                                 continue;
                         }
-                }
-                else
+                        break;
+                case 10:
+                        if (ap_query_functions(qid, &device_functions)) {
+                                kfree(ap_dev);
+                                continue;
+                        }
+                        if (test_ap_facility(device_functions, 3))
+                                ap_dev->device_type = AP_DEVICE_TYPE_CEX3C;
+                        else if (test_ap_facility(device_functions, 4))
+                                ap_dev->device_type = AP_DEVICE_TYPE_CEX3A;
+                        else {
+                                kfree(ap_dev);
+                                continue;
+                        }
+                        break;
+                default:
                         ap_dev->device_type = device_type;
+                }
 
                 ap_dev->device.bus = &ap_bus_type;
                 ap_dev->device.parent = ap_root_device;
diff --git a/drivers/s390/crypto/ap_bus.h b/drivers/s390/crypto/ap_bus.h
index 08b9738285b4..d960a6309eec 100644
--- a/drivers/s390/crypto/ap_bus.h
+++ b/drivers/s390/crypto/ap_bus.h
@@ -6,6 +6,7 @@
  *            Martin Schwidefsky <schwidefsky@de.ibm.com>
  *            Ralph Wuerthner <rwuerthn@de.ibm.com>
  *            Felix Beck <felix.beck@de.ibm.com>
+ *            Holger Dengler <hd@linux.vnet.ibm.com>
  *
  * Adjunct processor bus header file.
  *
@@ -72,7 +73,26 @@ struct ap_queue_status {
         unsigned int int_enabled        : 1;
         unsigned int response_code      : 8;
         unsigned int pad2               : 16;
-};
+} __packed;
+
+#define AP_QUEUE_STATUS_INVALID \
+                { 1, 1, 1, 0xF, 1, 0xFF, 0xFFFF }
+
+static inline
+int ap_queue_status_invalid_test(struct ap_queue_status *status)
+{
+        struct ap_queue_status invalid = AP_QUEUE_STATUS_INVALID;
+        return !(memcmp(status, &invalid, sizeof(struct ap_queue_status)));
+}
+
+#define MAX_AP_FACILITY 31
+
+static inline int test_ap_facility(unsigned int function, unsigned int nr)
+{
+        if (nr > MAX_AP_FACILITY)
+                return 0;
+        return function & (unsigned int)(0x80000000 >> nr);
+}
 
 #define AP_RESPONSE_NORMAL              0x00
 #define AP_RESPONSE_Q_NOT_AVAIL         0x01