s390/pci: performance statistics and debug infrastructure

Add support for reading the PCI function measurement block counters
provided by the hypervisor. Add two s390 debug features, one for
critical errors and one for tracing and provide wrappers to log data.

Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 36 insertions, 0 deletions

diff --git a/arch/s390/include/asm/pci_debug.h b/arch/s390/include/asm/pci_debug.h
new file mode 100644
index 000000000000..6bbec4265b6e
--- /dev/null
+++ b/arch/s390/include/asm/pci_debug.h
@@ -0,0 +1,36 @@
+#ifndef _S390_ASM_PCI_DEBUG_H
+#define _S390_ASM_PCI_DEBUG_H
+
+#include <asm/debug.h>
+
+extern debug_info_t *pci_debug_msg_id;
+extern debug_info_t *pci_debug_err_id;
+
+#ifdef CONFIG_PCI_DEBUG
+#define zpci_dbg(fmt, args...)                                                  \
+        do {                                                                    \
+                if (pci_debug_msg_id->level >= 2)                               \
+                        debug_sprintf_event(pci_debug_msg_id, 2, fmt , ## args);\
+        } while (0)
+
+#else /* !CONFIG_PCI_DEBUG */
+#define zpci_dbg(fmt, args...) do { } while (0)
+#endif
+
+#define zpci_err(text...)                                                       \
+        do {                                                                    \
+                char debug_buffer[16];                                          \
+                snprintf(debug_buffer, 16, text);                               \
+                debug_text_event(pci_debug_err_id, 0, debug_buffer);            \
+        } while (0)
+
+static inline void zpci_err_hex(void *addr, int len)
+{
+        while (len > 0) {
+                debug_event(pci_debug_err_id, 0, (void *) addr, len);
+                len -= pci_debug_err_id->buf_size;
+                addr += pci_debug_err_id->buf_size;
+        }
+}
+
+#endif