[PATCH v3 1/3] xen: add warning infrastructure

[Wei Liu <wei.liu2@citrix.com>]

Use an array to keep track of warning text, provide a function to add
warning text to track.  Print warnings (if any) right before finishing
using the console.

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
---
Cc: Jan Beulich <jbeulich@suse.com>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
---
 xen/arch/x86/setup.c      |  3 +++
 xen/common/Makefile       |  1 +
 xen/common/warning.c      | 50 +++++++++++++++++++++++++++++++++++++++++++++++
 xen/include/xen/warning.h |  7 +++++++
 4 files changed, 61 insertions(+)
 create mode 100644 xen/common/warning.c
 create mode 100644 xen/include/xen/warning.h

diff --git a/xen/arch/x86/setup.c b/xen/arch/x86/setup.c
index 6f6a6a7..3ef8c43 100644
--- a/xen/arch/x86/setup.c
+++ b/xen/arch/x86/setup.c
@@ -28,6 +28,7 @@
 #include <xen/tmem_xen.h>
 #include <xen/virtual_region.h>
 #include <xen/watchdog.h>
+#include <xen/warning.h>
 #include <public/version.h>
 #include <compat/platform.h>
 #include <compat/xen.h>
@@ -1582,6 +1583,8 @@ void __init noreturn __start_xen(unsigned long mbi_p)
 
     init_constructors();
 
+    warning_print();
+
     console_endboot();
 
     /* Hide UART from DOM0 if we're using it */
diff --git a/xen/common/Makefile b/xen/common/Makefile
index e9893e2..600b5ce 100644
--- a/xen/common/Makefile
+++ b/xen/common/Makefile
@@ -59,6 +59,7 @@ obj-y += vm_event.o
 obj-y += vmap.o
 obj-y += vsprintf.o
 obj-y += wait.o
+obj-y += warning.o
 obj-$(CONFIG_XENOPROF) += xenoprof.o
 obj-y += xmalloc_tlsf.o
 
diff --git a/xen/common/warning.c b/xen/common/warning.c
new file mode 100644
index 0000000..8a3e904
--- /dev/null
+++ b/xen/common/warning.c
@@ -0,0 +1,50 @@
+#include <xen/delay.h>
+#include <xen/init.h>
+#include <xen/lib.h>
+#include <xen/softirq.h>
+#include <xen/warning.h>
+
+#define WARNING_ARRAY_SIZE 20
+static unsigned int __initdata nr_warnings;
+static const char __initdata *warnings[WARNING_ARRAY_SIZE];
+
+void __init warning_add(const char *warning)
+{
+    if ( nr_warnings >= WARNING_ARRAY_SIZE )
+        panic("Too many pieces of warning text.");
+
+    warnings[nr_warnings] = warning;
+    nr_warnings++;
+}
+
+void __init warning_print(void)
+{
+    unsigned int i, j;
+
+    if ( !nr_warnings )
+        return;
+
+    for ( i = 0; i < nr_warnings; i++ )
+        printk("%s", warnings[i]);
+
+    for ( i = 0; i < 3; i++ )
+    {
+        printk("%u... ", 3 - i);
+        for ( j = 0; j < 100; j++ )
+        {
+            process_pending_softirqs();
+            mdelay(10);
+        }
+    }
+    printk("\n");
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/include/xen/warning.h b/xen/include/xen/warning.h
new file mode 100644
index 0000000..c0661d5
--- /dev/null
+++ b/xen/include/xen/warning.h
@@ -0,0 +1,7 @@
+#ifndef _WARNING_H_
+#define _WARNING_H_
+
+void warning_add(const char *warning);
+void warning_print(void);
+
+#endif
-- 
2.1.4


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