On 07/10/2021 10.50, Janosch Frank wrote:
Every time something goes wrong in a way we don't expect, we need to
add debug prints to some UVC to get the unexpected return code.
Let's just put the printing behind a macro so we can enable it if
needed via a simple switch.
Signed-off-by: Janosch Frank <frankja@xxxxxxxxxxxxx>
Reviewed-by: Claudio Imbrenda <imbrenda@xxxxxxxxxxxxx>
---
lib/s390x/asm/uv.h | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/lib/s390x/asm/uv.h b/lib/s390x/asm/uv.h
index 2f099553..16db086d 100644
--- a/lib/s390x/asm/uv.h
+++ b/lib/s390x/asm/uv.h
@@ -12,6 +12,11 @@
#ifndef _ASMS390X_UV_H_
#define _ASMS390X_UV_H_
+/* Enables printing of command code and return codes for failed UVCs */
+#ifndef UVC_ERR_DEBUG
+#define UVC_ERR_DEBUG 0
+#endif
+
#define UVC_RC_EXECUTED 0x0001
#define UVC_RC_INV_CMD 0x0002
#define UVC_RC_INV_STATE 0x0003
@@ -194,6 +199,13 @@ static inline int uv_call_once(unsigned long r1, unsigned long r2)
: [cc] "=d" (cc)
: [r1] "a" (r1), [r2] "a" (r2)
: "memory", "cc");
+
+ if (UVC_ERR_DEBUG && cc)
+ printf("UV call error: call %x rc %x rrc %x\n",
+ ((struct uv_cb_header *)r2)->cmd,
+ ((struct uv_cb_header *)r2)->rc,
+ ((struct uv_cb_header *)r2)->rrc);
+
return cc;
}
Reviewed-by: Thomas Huth <thuth@xxxxxxxxxx>
