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-rw-r--r--drivers/s390/crypto/vfio_ap_debug.h32
-rw-r--r--drivers/s390/crypto/vfio_ap_drv.c21
2 files changed, 53 insertions, 0 deletions
diff --git a/drivers/s390/crypto/vfio_ap_debug.h b/drivers/s390/crypto/vfio_ap_debug.h
new file mode 100644
index 000000000000..180156121421
--- /dev/null
+++ b/drivers/s390/crypto/vfio_ap_debug.h
@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright IBM Corp. 2022
+ *
+ * Author(s): Tony Krowiak <akrowiak@linux.ibm.com>
+ */
+#ifndef VFIO_AP_DEBUG_H
+#define VFIO_AP_DEBUG_H
+
+#include <asm/debug.h>
+
+#define DBF_ERR 3 /* error conditions */
+#define DBF_WARN 4 /* warning conditions */
+#define DBF_INFO 5 /* informational */
+#define DBF_DEBUG 6 /* for debugging only */
+
+#define DBF_MAX_SPRINTF_ARGS 10
+
+#define VFIO_AP_DBF(...) \
+ debug_sprintf_event(vfio_ap_dbf_info, ##__VA_ARGS__)
+#define VFIO_AP_DBF_ERR(...) \
+ debug_sprintf_event(vfio_ap_dbf_info, DBF_ERR, ##__VA_ARGS__)
+#define VFIO_AP_DBF_WARN(...) \
+ debug_sprintf_event(vfio_ap_dbf_info, DBF_WARN, ##__VA_ARGS__)
+#define VFIO_AP_DBF_INFO(...) \
+ debug_sprintf_event(vfio_ap_dbf_info, DBF_INFO, ##__VA_ARGS__)
+#define VFIO_AP_DBF_DBG(...) \
+ debug_sprintf_event(vfio_ap_dbf_info, DBF_DEBUG, ##__VA_ARGS__)
+
+extern debug_info_t *vfio_ap_dbf_info;
+
+#endif /* VFIO_AP_DEBUG_H */
diff --git a/drivers/s390/crypto/vfio_ap_drv.c b/drivers/s390/crypto/vfio_ap_drv.c
index e043ae236630..82b6ffee06c5 100644
--- a/drivers/s390/crypto/vfio_ap_drv.c
+++ b/drivers/s390/crypto/vfio_ap_drv.c
@@ -14,6 +14,7 @@
#include <linux/string.h>
#include <asm/facility.h>
#include "vfio_ap_private.h"
+#include "vfio_ap_debug.h"
#define VFIO_AP_ROOT_NAME "vfio_ap"
#define VFIO_AP_DEV_NAME "matrix"
@@ -26,6 +27,7 @@ MODULE_DESCRIPTION("VFIO AP device driver, Copyright IBM Corp. 2018");
MODULE_LICENSE("GPL v2");
struct ap_matrix_dev *matrix_dev;
+debug_info_t *vfio_ap_dbf_info;
/* Only type 10 adapters (CEX4 and later) are supported
* by the AP matrix device driver
@@ -250,10 +252,28 @@ static void vfio_ap_matrix_dev_destroy(void)
root_device_unregister(root_device);
}
+static int __init vfio_ap_dbf_info_init(void)
+{
+ vfio_ap_dbf_info = debug_register("vfio_ap", 1, 1,
+ DBF_MAX_SPRINTF_ARGS * sizeof(long));
+
+ if (!vfio_ap_dbf_info)
+ return -ENOENT;
+
+ debug_register_view(vfio_ap_dbf_info, &debug_sprintf_view);
+ debug_set_level(vfio_ap_dbf_info, DBF_WARN);
+
+ return 0;
+}
+
static int __init vfio_ap_init(void)
{
int ret;
+ ret = vfio_ap_dbf_info_init();
+ if (ret)
+ return ret;
+
/* If there are no AP instructions, there is nothing to pass through. */
if (!ap_instructions_available())
return -ENODEV;
@@ -284,6 +304,7 @@ static void __exit vfio_ap_exit(void)
vfio_ap_mdev_unregister();
ap_driver_unregister(&vfio_ap_drv);
vfio_ap_matrix_dev_destroy();
+ debug_unregister(vfio_ap_dbf_info);
}
module_init(vfio_ap_init);