[PATCH v2] selftests: drivers: fpga: A test for interrupt support

[trix@redhat.com]

From: Tom Rix <trix@redhat.com>

Check that the ioctl DFL_FPGA_PORT_ERR_GET_IRQ_NUM returns
an expected result.

Tested on vf device 0xbcc1

Sample run with
 # make -C tools/testing/selftests TARGETS=drivers/fpga run_tests
 ...
 TAP version 13
 1..1
 # selftests: drivers/fpga: intr
 # TAP version 13
 # 1..1
 # # Starting 1 tests from 1 test cases.
 # #  RUN           global.afu_intr ...
 # #            OK  global.afu_intr
 # ok 1 global.afu_intr
 # # PASSED: 1 / 1 tests passed.
 # # Totals: pass:1 fail:0 xfail:0 xpass:0 skip:0 error:0
 ok 1 selftests: drivers/fpga: intr

Signed-off-by: Tom Rix <trix@redhat.com>
---
v1: Convert to kselftest_harness.h framework
---
 MAINTAINERS                                   |  1 +
 tools/testing/selftests/Makefile              |  1 +
 tools/testing/selftests/drivers/fpga/Makefile |  7 ++++
 tools/testing/selftests/drivers/fpga/config   |  1 +
 tools/testing/selftests/drivers/fpga/intr.c   | 36 +++++++++++++++++++
 5 files changed, 46 insertions(+)
 create mode 100644 tools/testing/selftests/drivers/fpga/Makefile
 create mode 100644 tools/testing/selftests/drivers/fpga/config
 create mode 100644 tools/testing/selftests/drivers/fpga/intr.c

diff --git a/MAINTAINERS b/MAINTAINERS
index de610a06cb5c..7ed3ce58d95e 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6973,6 +6973,7 @@ F:	Documentation/driver-api/fpga/
 F:	Documentation/fpga/
 F:	drivers/fpga/
 F:	include/linux/fpga/
+F:	tools/testing/selftests/drivers/fpga/
 
 FPGA SECURITY MANAGER DRIVERS
 M:	Russ Weight <russell.h.weight@intel.com>
diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
index afbab4aeef3c..aad4763ec348 100644
--- a/tools/testing/selftests/Makefile
+++ b/tools/testing/selftests/Makefile
@@ -9,6 +9,7 @@ TARGETS += core
 TARGETS += cpufreq
 TARGETS += cpu-hotplug
 TARGETS += drivers/dma-buf
+TARGETS += drivers/fpga
 TARGETS += efivarfs
 TARGETS += exec
 TARGETS += filesystems
diff --git a/tools/testing/selftests/drivers/fpga/Makefile b/tools/testing/selftests/drivers/fpga/Makefile
new file mode 100644
index 000000000000..eba35c405d5b
--- /dev/null
+++ b/tools/testing/selftests/drivers/fpga/Makefile
@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0-only
+CFLAGS += -I../../../../../usr/include/
+CFLAGS += -I../../../../../include/uapi/
+
+TEST_GEN_PROGS := intr
+
+include ../../lib.mk
diff --git a/tools/testing/selftests/drivers/fpga/config b/tools/testing/selftests/drivers/fpga/config
new file mode 100644
index 000000000000..e2111b81d8d7
--- /dev/null
+++ b/tools/testing/selftests/drivers/fpga/config
@@ -0,0 +1 @@
+CONFIG_FPGA_DFL_AFU=m
diff --git a/tools/testing/selftests/drivers/fpga/intr.c b/tools/testing/selftests/drivers/fpga/intr.c
new file mode 100644
index 000000000000..b362fb1f788d
--- /dev/null
+++ b/tools/testing/selftests/drivers/fpga/intr.c
@@ -0,0 +1,36 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+#include <sys/fcntl.h>
+#include <sys/ioctl.h>
+#include <linux/fpga-dfl.h>
+
+#include "../../kselftest_harness.h"
+
+TEST(afu_intr)
+{
+	int devfd, status;
+	struct dfl_fpga_port_info port_info;
+	uint32_t irq_num = UINT32_MAX;
+
+	devfd = open("/dev/dfl-port.0", O_RDONLY);
+	if (devfd < 0)
+		SKIP(0, "no fpga afu device 0");
+	/*
+	 * From fpga-dl.h :
+	 * Currently hardware supports up to 1 irq.
+	 * Return: 0 on success, -errno on failure.
+	 */
+	status = ioctl(devfd, DFL_FPGA_PORT_ERR_GET_IRQ_NUM, &irq_num);
+	ASSERT_EQ(0, status) {
+		TH_LOG("ioctl() failed to get the number irqs");
+	}
+	ASSERT_LT(irq_num, 256) {
+		TH_LOG("unexpeced number of irqs");
+	}
+	close(devfd);
+}
+
+TEST_HARNESS_MAIN
-- 
2.27.0