Add functions and definitions needed to test the Adjunct
Processor (AP) crypto interface.
Signed-off-by: Janosch Frank <frankja@xxxxxxxxxxxxx>
---
lib/s390x/ap.c | 93 ++++++++++++++++++++++++++++++++++++++++++++++++++
lib/s390x/ap.h | 86 ++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 179 insertions(+)
create mode 100644 lib/s390x/ap.c
create mode 100644 lib/s390x/ap.h
diff --git a/lib/s390x/ap.c b/lib/s390x/ap.c
new file mode 100644
index 00000000..374fa210
--- /dev/null
+++ b/lib/s390x/ap.c
@@ -0,0 +1,93 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * AP crypto functions
+ *
+ * Some parts taken from the Linux AP driver.
+ *
+ * Copyright IBM Corp. 2023
+ * Author: Janosch Frank <frankja@xxxxxxxxxxxxx>
+ * Tony Krowiak <akrowia@xxxxxxxxxxxxx>
+ * Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
+ * Harald Freudenberger <freude@xxxxxxxxxx>
+ */
+
+#include <libcflat.h>
+#include <interrupt.h>
+#include <ap.h>
+#include <asm/time.h>
+
+int ap_pqap_tapq(uint8_t ap, uint8_t qn, struct ap_queue_status *apqsw,
+ struct pqap_r2 *r2)
+{
+ struct pqap_r0 r0 = {};
+ int cc;
+
+ /*
+ * Test AP Queue
+ *
+ * Writes AP configuration information to the memory pointed
+ * at by GR2.
+ *
+ * Inputs: 0
+ * Outputs: 1 (APQSW), 2 (tapq data)
+ * Synchronous
+ */
+ r0.ap = ap;
+ r0.qn = qn;
+ r0.fc = PQAP_TEST_APQ;
+ asm volatile(
+ " lgr 0,%[r0]\n"
+ " .insn rre,0xb2af0000,0,0\n" /* PQAP */
+ " stg 1, %[apqsw]\n"
+ " ipm %[cc]\n"
+ " srl %[cc],28\n"
+ : [apqsw] "=&T" (*apqsw), [r2] "+&d" (r2), [cc] "=&d" (cc)
+ : [r0] "d" (r0)
+ : "memory");
+
+ return cc;
+}
+
+int ap_pqap_qci(struct ap_config_info *info)
+{
+ struct pqap_r0 r0 = { .fc = PQAP_QUERY_AP_CONF_INFO };
+ unsigned long r1 = 0;
+ int cc;
+
+ /*
+ * Query AP Configuration Information
+ *
+ * Writes AP configuration information to the memory pointed
+ * at by GR2.
+ *
+ * Inputs: 0,2
+ * Outputs: memory at r2 address
+ * Synchronous
+ */
+ asm volatile(
+ " lgr 0,%[r0]\n"
+ " lgr 2,%[info]\n"
+ " .insn rre,0xb2af0000,0,0\n" /* PQAP */
+ " ipm %[cc]\n"
+ " srl %[cc],28\n"
+ : [r1] "+&d" (r1), [cc] "=&d" (cc)
+ : [r0] "d" (r0), [info] "d" (info)
+ : "cc", "memory", "0", "2");
+
+ return cc;
+}
+
+bool ap_check(void)
+{
+ struct ap_queue_status r1 = {};
+ struct pqap_r2 r2 = {};
+
+ /* Base AP support has no STFLE or SCLP feature bit */
+ expect_pgm_int();
+ ap_pqap_tapq(0, 0, &r1, &r2);
+
+ if (clear_pgm_int() == PGM_INT_CODE_OPERATION)
+ return false;
+
+ return true;
+}
diff --git a/lib/s390x/ap.h b/lib/s390x/ap.h
new file mode 100644
index 00000000..79fe6eb0
--- /dev/null
+++ b/lib/s390x/ap.h
@@ -0,0 +1,86 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * AP definitions
+ *
+ * Copyright IBM Corp. 2023
+ * Author: Janosch Frank <frankja@xxxxxxxxxxxxx>
+ * Tony Krowiak <akrowia@xxxxxxxxxxxxx>
+ * Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
+ * Harald Freudenberger <freude@xxxxxxxxxx>
+ */
+
+#ifndef _S390X_AP_H_
+#define _S390X_AP_H_
+
+enum PQAP_FC {
+ PQAP_TEST_APQ,
+ PQAP_RESET_APQ,
+ PQAP_ZEROIZE_APQ,
+ PQAP_QUEUE_INT_CONTRL,
+ PQAP_QUERY_AP_CONF_INFO,
+ PQAP_QUERY_AP_COMP_TYPE,
+ PQAP_BEST_AP,
+};
+
+struct ap_queue_status {
+ uint32_t pad0; /* Ignored padding for zArch */
+ uint32_t empty : 1;
+ uint32_t replies_waiting: 1;
+ uint32_t full : 1;
+ uint32_t pad1 : 4;
+ uint32_t irq_enabled : 1;
+ uint32_t rc : 8;
+ uint32_t pad2 : 16;
+} __attribute__((packed)) __attribute__((aligned(8)));
+_Static_assert(sizeof(struct ap_queue_status) == sizeof(uint64_t), "APQSW size");
+
+struct ap_config_info {
+ uint8_t apsc : 1; /* S bit */
+ uint8_t apxa : 1; /* N bit */
+ uint8_t qact : 1; /* C bit */
+ uint8_t rc8a : 1; /* R bit */
+ uint8_t l : 1; /* L bit */
+ uint8_t lext : 3; /* Lext bits */
+ uint8_t reserved2[3];
+ uint8_t Na; /* max # of APs - 1 */
+ uint8_t Nd; /* max # of Domains - 1 */
+ uint8_t reserved6[10];
+ uint32_t apm[8]; /* AP ID mask */
+ uint32_t aqm[8]; /* AP (usage) queue mask */
+ uint32_t adm[8]; /* AP (control) domain mask */
+ uint8_t _reserved4[16];
+} __attribute__((aligned(8))) __attribute__ ((__packed__));
+_Static_assert(sizeof(struct ap_config_info) == 128, "PQAP QCI size");
+
+struct pqap_r0 {
+ uint32_t pad0;
+ uint8_t fc;
+ uint8_t t : 1; /* Test facilities (TAPQ)*/
+ uint8_t pad1 : 7;
+ uint8_t ap;
+ uint8_t qn;
+} __attribute__((packed)) __attribute__((aligned(8)));
+
+struct pqap_r2 {
+ uint8_t s : 1; /* Special Command facility */
+ uint8_t m : 1; /* AP4KM */
+ uint8_t c : 1; /* AP4KC */
+ uint8_t cop : 1; /* AP is in coprocessor mode */
+ uint8_t acc : 1; /* AP is in accelerator mode */
+ uint8_t xcp : 1; /* AP is in XCP-mode */
+ uint8_t n : 1; /* AP extended addressing facility */
+ uint8_t pad_0 : 1;
+ uint8_t pad_1[3];
+ uint8_t at;
+ uint8_t nd;
+ uint8_t pad_6;
+ uint8_t pad_7 : 4;
+ uint8_t qd : 4;
+} __attribute__((packed)) __attribute__((aligned(8)));
+_Static_assert(sizeof(struct pqap_r2) == sizeof(uint64_t), "pqap_r2 size");
+
+bool ap_check(void);
+int ap_pqap_tapq(uint8_t ap, uint8_t qn, struct ap_queue_status *apqsw,
+ struct pqap_r2 *r2);
+int ap_pqap_qci(struct ap_config_info *info);
+#endif
--
2.34.1
