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path: root/drivers/s390/crypto/ap_bus.c
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Diffstat (limited to 'drivers/s390/crypto/ap_bus.c')
-rw-r--r--drivers/s390/crypto/ap_bus.c67
1 files changed, 66 insertions, 1 deletions
diff --git a/drivers/s390/crypto/ap_bus.c b/drivers/s390/crypto/ap_bus.c
index 8fd8c62455e..67302b944ab 100644
--- a/drivers/s390/crypto/ap_bus.c
+++ b/drivers/s390/crypto/ap_bus.c
@@ -27,6 +27,7 @@
#define KMSG_COMPONENT "ap"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+#include <linux/kernel_stat.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/delay.h>
@@ -154,7 +155,7 @@ static inline int ap_instructions_available(void)
*/
static int ap_interrupts_available(void)
{
- return test_facility(1) && test_facility(2);
+ return test_facility(2) && test_facility(65);
}
/**
@@ -221,6 +222,69 @@ 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)
+{
+ 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;
+
+ asm volatile(
+ ".long 0xb2af0000\n"
+ "0: la %1,0\n"
+ "1:\n"
+ EX_TABLE(0b, 1b)
+ : "+d" (reg0), "=d" (reg1), "=d" (reg2)
+ :
+ : "cc");
+
+ if (reg2 & 0x6000000000000000ULL)
+ *support = 1;
+ else
+ *support = 0;
+
+ return reg1;
+}
+
+/**
+ * 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)
+{
+ struct ap_queue_status status;
+ int i, support = 0;
+ status = __ap_4096_commands_available(qid, &support);
+
+ for (i = 0; i < AP_MAX_RESET; i++) {
+ switch (status.response_code) {
+ case AP_RESPONSE_NORMAL:
+ return support;
+ case AP_RESPONSE_RESET_IN_PROGRESS:
+ case AP_RESPONSE_BUSY:
+ break;
+ case AP_RESPONSE_Q_NOT_AVAIL:
+ case AP_RESPONSE_DECONFIGURED:
+ case AP_RESPONSE_CHECKSTOPPED:
+ case AP_RESPONSE_INVALID_ADDRESS:
+ return 0;
+ case AP_RESPONSE_OTHERWISE_CHANGED:
+ break;
+ default:
+ break;
+ }
+ if (i < AP_MAX_RESET - 1) {
+ udelay(5);
+ status = __ap_4096_commands_available(qid, &support);
+ }
+ }
+ return support;
+}
+EXPORT_SYMBOL(ap_4096_commands_available);
+
/**
* ap_queue_enable_interruption(): Enable interruption on an AP.
* @qid: The AP queue number
@@ -1042,6 +1106,7 @@ out:
static void ap_interrupt_handler(void *unused1, void *unused2)
{
+ kstat_cpu(smp_processor_id()).irqs[IOINT_APB]++;
tasklet_schedule(&ap_tasklet);
}