We add a new css_lib file to contain the I/O functions we may
share with different tests.
First function is the subchannel_enable() function.
When a channel is enabled we can start a SENSE_ID command using
the SSCH instruction to recognize the control unit and device.
This tests the success of SSCH, the I/O interruption and the TSCH
instructions.
The test expects a device with a control unit type of 0xC0CA as the
first subchannel of the CSS.
Signed-off-by: Pierre Morel <pmorel@xxxxxxxxxxxxx>
---
lib/s390x/css.h | 20 ++++++
lib/s390x/css_lib.c | 55 +++++++++++++++++
s390x/Makefile | 1 +
s390x/css.c | 145 ++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 221 insertions(+)
create mode 100644 lib/s390x/css_lib.c
diff --git a/lib/s390x/css.h b/lib/s390x/css.h
index e0d3a98..f4df7bc 100644
--- a/lib/s390x/css.h
+++ b/lib/s390x/css.h
@@ -99,6 +99,19 @@ struct irb {
uint32_t emw[8];
} __attribute__ ((aligned(4)));
+#define CCW_CMD_SENSE_ID 0xe4
+#define PONG_CU 0xc0ca
+struct senseid {
+ /* common part */
+ uint8_t reserved; /* always 0x'FF' */
+ uint16_t cu_type; /* control unit type */
+ uint8_t cu_model; /* control unit model */
+ uint16_t dev_type; /* device type */
+ uint8_t dev_model; /* device model */
+ uint8_t unused; /* padding byte */
+ uint8_t padding[256 - 10]; /* Extra padding for CCW */
+} __attribute__ ((aligned(4))) __attribute__ ((packed));
+
/* CSS low level access functions */
static inline int ssch(unsigned long schid, struct orb *addr)
@@ -256,4 +269,11 @@ static inline struct ccw *dump_ccw(struct ccw *cp)
return NULL;
}
#endif /* DEBUG_CSS */
+
+#define SID_ONE 0x00010000
+
+/* Library functions */
+int enable_subchannel(unsigned int sid);
+int start_ccw1_chain(unsigned int sid, struct ccw1 *ccw);
+
#endif
diff --git a/lib/s390x/css_lib.c b/lib/s390x/css_lib.c
new file mode 100644
index 0000000..80b9359
--- /dev/null
+++ b/lib/s390x/css_lib.c
@@ -0,0 +1,55 @@
+/*
+ * Channel subsystem library functions
+ *
+ * Copyright (c) 2020 IBM Corp.
+ *
+ * Authors:
+ * Pierre Morel <pmorel@xxxxxxxxxxxxx>
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2.
+ */
+#include <stdint.h>
+#include <stddef.h>
+#include <css.h>
+
+int enable_subchannel(unsigned int sid)
+{
+ struct schib schib;
+ struct pmcw *pmcw = &schib.pmcw;
+ int try_count = 5;
+ int cc;
+
+ if (!(sid & SID_ONE))
+ return -1;
+
+ cc = stsch(sid, &schib);
+ if (cc)
+ return -cc;
+
+ do {
+ pmcw->flags |= PMCW_ENABLE;
+
+ cc = msch(sid, &schib);
+ if (cc)
+ return -cc;
+
+ cc = stsch(sid, &schib);
+ if (cc)
+ return -cc;
+
+ } while (!(pmcw->flags & PMCW_ENABLE) && --try_count);
+
+ return try_count;
+}
+
+int start_ccw1_chain(unsigned int sid, struct ccw1 *ccw)
+{
+ struct orb orb;
+
+ orb.intparm = sid;
+ orb.ctrl = ORB_F_INIT_IRQ|ORB_F_FORMAT|ORB_F_LPM_DFLT;
+ orb.cpa = (unsigned int) (unsigned long)ccw;
+
+ return ssch(sid, &orb);
+}
diff --git a/s390x/Makefile b/s390x/Makefile
index baebf18..166cb5c 100644
--- a/s390x/Makefile
+++ b/s390x/Makefile
@@ -53,6 +53,7 @@ cflatobjs += lib/s390x/interrupt.o
cflatobjs += lib/s390x/mmu.o
cflatobjs += lib/s390x/smp.o
cflatobjs += lib/s390x/css_dump.o
+cflatobjs += lib/s390x/css_lib.o
OBJDIRS += lib/s390x
diff --git a/s390x/css.c b/s390x/css.c
index 1b60a47..c94a916 100644
--- a/s390x/css.c
+++ b/s390x/css.c
@@ -20,8 +20,24 @@
#include <css.h>
+#define PONG_CU_TYPE 0xc0ca
+
+struct lowcore *lowcore = (void *)0x0;
+
static struct schib schib;
static int test_device_sid;
+#define NUM_CCW 100
+static struct ccw1 ccw[NUM_CCW];
+static struct irb irb;
+static struct senseid senseid;
+
+static void set_io_irq_subclass_mask(uint64_t const new_mask)
+{
+ asm volatile (
+ "lctlg %%c6, %%c6, %[source]\n"
+ : /* No outputs */
+ : [source] "R" (new_mask));
+}
static void test_enumerate(void)
{
@@ -131,12 +147,140 @@ retry:
test_device_sid, retry_count, pmcw->flags);
}
+static void enable_io_isc(void)
+{
+ /* Let's enable all ISCs for I/O interrupt */
+ set_io_irq_subclass_mask(0x00000000ff000000);
+}
+
+static void irq_io(void)
+{
+ int ret = 0;
+ char *flags;
+ int sid;
+
+ report_prefix_push("Interrupt");
+ /* Lowlevel set the SID as interrupt parameter. */
+ if (lowcore->io_int_param != test_device_sid) {
+ report(0,
+ "Bad io_int_param: %x expected %x",
+ lowcore->io_int_param, test_device_sid);
+ goto pop;
+ }
+ report_prefix_pop();
+
+ report_prefix_push("tsch");
+ sid = lowcore->subsys_id_word;
+ ret = tsch(sid, &irb);
+ switch (ret) {
+ case 1:
+ dump_irb(&irb);
+ flags = dump_scsw_flags(irb.scsw.ctrl);
+ report(0,
+ "I/O interrupt, CC 1 but tsch reporting sch %08x as not status pending: %s",
+ sid, flags);
+ break;
+ case 2:
+ report(0, "tsch returns unexpected CC 2");
+ break;
+ case 3:
+ report(0, "tsch reporting sch %08x as not operational", sid);
+ break;
+ case 0:
+ /* Stay humble on success */
+ break;
+ }
+pop:
+ report_prefix_pop();
+ lowcore->io_old_psw.mask &= ~PSW_MASK_WAIT;
+}
+
+static int start_subchannel(int code, void *data, int count,
+ unsigned char flags)
+{
+ int ret;
+
+ report_prefix_push("start_senseid");
+ /* Build the CCW chain with a single CCW */
+ ccw[0].code = code;
+ ccw[0].flags = flags; /* No flags need to be set */
+ ccw[0].count = count;
+ ccw[0].data_address = (int)(unsigned long)data;
+
+ ret = start_ccw1_chain(test_device_sid, ccw);
+ if (ret) {
+ report(0, "start_ccw_chain failed ret=%d", ret);
+ report_prefix_pop();
+ return 0;
+ }
+ report_prefix_pop();
+ return 1;
+}
+
+/*
+ * test_sense
+ * Pre-requisits:
+ * - We need the QEMU PONG device as the first recognized
+ * device by the enumeration.
+ * - ./s390x-run s390x/css.elf -device ccw-pong,cu_type=0xc0ca
+ */
+static void test_sense(void)
+{
+ int ret;
+
+ if (!test_device_sid) {
+ report_skip("No device");
+ return;
+ }
+
+ ret = enable_subchannel(test_device_sid);
+ if (ret < 0) {
+ report(0,
+ "Could not enable the subchannel: %08x",
+ test_device_sid);
+ return;
+ }
+
+ ret = register_io_int_func(irq_io);
+ if (ret) {
+ report(0, "Could not register IRQ handler");
+ goto unreg_cb;
+ }
+
+ lowcore->io_int_param = 0;
+
+ ret = start_subchannel(CCW_CMD_SENSE_ID, &senseid, sizeof(senseid),
+ CCW_F_SLI);
+ if (!ret) {
+ report(0, "ssch failed for SENSE ID on sch %08x",
+ test_device_sid);
+ goto unreg_cb;
+ }
+
+ wait_for_interrupt(PSW_MASK_IO);
+
+ if (lowcore->io_int_param != test_device_sid)
+ goto unreg_cb;
+
+ report_info("reserved %02x cu_type %04x cu_model %02x dev_type %04x dev_model %02x",
+ senseid.reserved, senseid.cu_type, senseid.cu_model,
+ senseid.dev_type, senseid.dev_model);
+
+ report((senseid.cu_type == PONG_CU),
+ "cu_type: expect 0x%04x got 0x%04x",
+ PONG_CU_TYPE, senseid.cu_type);
+
+unreg_cb:
+ unregister_io_int_func(irq_io);
+}
+
static struct {
const char *name;
void (*func)(void);
} tests[] = {
{ "enumerate (stsch)", test_enumerate },
{ "enable (msch)", test_enable },
+ { "sense (ssch/tsch)", test_sense },
{ NULL, NULL }
};
@@ -145,6 +289,7 @@ int main(int argc, char *argv[])
int i;
report_prefix_push("Channel Subsystem");
+ enable_io_isc();
for (i = 0; tests[i].name; i++) {
report_prefix_push(tests[i].name);
tests[i].func();
--
2.25.1
