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-rw-r--r--drivers/s390/crypto/ap_bus.c137
1 files changed, 96 insertions, 41 deletions
diff --git a/drivers/s390/crypto/ap_bus.c b/drivers/s390/crypto/ap_bus.c
index 4d41bf75c23..faa058016b5 100644
--- a/drivers/s390/crypto/ap_bus.c
+++ b/drivers/s390/crypto/ap_bus.c
@@ -204,6 +204,24 @@ ap_test_queue(ap_qid_t qid, int *queue_depth, int *device_type)
}
/**
+ * ap_query_facilities(): PQAP(TAPQ) query facilities.
+ * @qid: The AP queue number
+ *
+ * Returns content of general register 2 after the PQAP(TAPQ)
+ * instruction was called.
+ */
+static inline unsigned long ap_query_facilities(ap_qid_t qid)
+{
+ register unsigned long reg0 asm ("0") = qid | 0x00800000UL;
+ register unsigned long reg1 asm ("1");
+ register unsigned long reg2 asm ("2") = 0UL;
+
+ asm volatile(".long 0xb2af0000" /* PQAP(TAPQ) */
+ : "+d" (reg0), "=d" (reg1), "+d" (reg2) : : "cc");
+ return reg2;
+}
+
+/**
* ap_reset_queue(): Reset adjunct processor queue.
* @qid: The AP queue number
*
@@ -1007,6 +1025,47 @@ void ap_bus_force_rescan(void)
EXPORT_SYMBOL(ap_bus_force_rescan);
/*
+ * ap_test_config(): helper function to extract the nrth bit
+ * within the unsigned int array field.
+ */
+static inline int ap_test_config(unsigned int *field, unsigned int nr)
+{
+ if (nr > 0xFFu)
+ return 0;
+ return ap_test_bit((field + (nr >> 5)), (nr & 0x1f));
+}
+
+/*
+ * ap_test_config_card_id(): Test, whether an AP card ID is configured.
+ * @id AP card ID
+ *
+ * Returns 0 if the card is not configured
+ * 1 if the card is configured or
+ * if the configuration information is not available
+ */
+static inline int ap_test_config_card_id(unsigned int id)
+{
+ if (!ap_configuration)
+ return 1;
+ return ap_test_config(ap_configuration->apm, id);
+}
+
+/*
+ * ap_test_config_domain(): Test, whether an AP usage domain is configured.
+ * @domain AP usage domain ID
+ *
+ * Returns 0 if the usage domain is not configured
+ * 1 if the usage domain is configured or
+ * if the configuration information is not available
+ */
+static inline int ap_test_config_domain(unsigned int domain)
+{
+ if (!ap_configuration)
+ return 1;
+ return ap_test_config(ap_configuration->aqm, domain);
+}
+
+/*
* AP bus attributes.
*/
static ssize_t ap_domain_show(struct bus_type *bus, char *buf)
@@ -1121,6 +1180,42 @@ static ssize_t poll_timeout_store(struct bus_type *bus, const char *buf,
static BUS_ATTR(poll_timeout, 0644, poll_timeout_show, poll_timeout_store);
+static ssize_t ap_max_domain_id_show(struct bus_type *bus, char *buf)
+{
+ ap_qid_t qid;
+ int i, nd, max_domain_id = -1;
+ unsigned long fbits;
+
+ if (ap_configuration) {
+ if (ap_domain_index >= 0 && ap_domain_index < AP_DOMAINS) {
+ for (i = 0; i < AP_DEVICES; i++) {
+ if (!ap_test_config_card_id(i))
+ continue;
+ qid = AP_MKQID(i, ap_domain_index);
+ fbits = ap_query_facilities(qid);
+ if (fbits & (1UL << 57)) {
+ /* the N bit is 0, Nd field is filled */
+ nd = (int)((fbits & 0x00FF0000UL)>>16);
+ if (nd > 0)
+ max_domain_id = nd;
+ else
+ max_domain_id = 15;
+ } else {
+ /* N bit is 1, max 16 domains */
+ max_domain_id = 15;
+ }
+ break;
+ }
+ }
+ } else {
+ /* no APXA support, older machines with max 16 domains */
+ max_domain_id = 15;
+ }
+ return snprintf(buf, PAGE_SIZE, "%d\n", max_domain_id);
+}
+
+static BUS_ATTR(ap_max_domain_id, 0444, ap_max_domain_id_show, NULL);
+
static struct bus_attribute *const ap_bus_attrs[] = {
&bus_attr_ap_domain,
&bus_attr_ap_control_domain_mask,
@@ -1128,50 +1223,10 @@ static struct bus_attribute *const ap_bus_attrs[] = {
&bus_attr_poll_thread,
&bus_attr_ap_interrupts,
&bus_attr_poll_timeout,
+ &bus_attr_ap_max_domain_id,
NULL,
};
-static inline int ap_test_config(unsigned int *field, unsigned int nr)
-{
- if (nr > 0xFFu)
- return 0;
- return ap_test_bit((field + (nr >> 5)), (nr & 0x1f));
-}
-
-/*
- * ap_test_config_card_id(): Test, whether an AP card ID is configured.
- * @id AP card ID
- *
- * Returns 0 if the card is not configured
- * 1 if the card is configured or
- * if the configuration information is not available
- */
-static inline int ap_test_config_card_id(unsigned int id)
-{
- if (!ap_configuration)
- return 1;
- return ap_test_config(ap_configuration->apm, id);
-}
-
-/*
- * ap_test_config_domain(): Test, whether an AP usage domain is configured.
- * @domain AP usage domain ID
- *
- * Returns 0 if the usage domain is not configured
- * 1 if the usage domain is configured or
- * if the configuration information is not available
- */
-static inline int ap_test_config_domain(unsigned int domain)
-{
- if (!ap_configuration) /* QCI not supported */
- if (domain < 16)
- return 1; /* then domains 0...15 are configured */
- else
- return 0;
- else
- return ap_test_config(ap_configuration->aqm, domain);
-}
-
/**
* ap_query_configuration(): Query AP configuration information.
*