[PATCH] lockdep: irqtrace subsystem, x86_64 support

Add irqflags-tracing support to x86_64.

[akpm@osdl.org: build fix]
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 61 insertions, 0 deletions

diff --git a/include/asm-x86_64/irqflags.h b/include/asm-x86_64/irqflags.h
new file mode 100644
index 000000000000..22f3c06b247e
--- /dev/null
+++ b/include/asm-x86_64/irqflags.h
@@ -0,0 +1,61 @@
+/*
+ * include/asm-x86_64/irqflags.h
+ *
+ * IRQ flags handling
+ *
+ * This file gets included from lowlevel asm headers too, to provide
+ * wrapped versions of the local_irq_*() APIs, based on the
+ * raw_local_irq_*() macros from the lowlevel headers.
+ */
+#ifndef _ASM_IRQFLAGS_H
+#define _ASM_IRQFLAGS_H
+
+#ifndef __ASSEMBLY__
+
+/* interrupt control.. */
+#define raw_local_save_flags(x) do { warn_if_not_ulong(x); __asm__ __volatile__("# save_flags \n\t pushfq ; popq %q0":"=g" (x): /* no input */ :"memory"); } while (0)
+#define raw_local_irq_restore(x)        __asm__ __volatile__("# restore_flags \n\t pushq %0 ; popfq": /* no output */ :"g" (x):"memory", "cc")
+
+#ifdef CONFIG_X86_VSMP
+/* Interrupt control for VSMP  architecture */
+#define raw_local_irq_disable() do { unsigned long flags; raw_local_save_flags(flags); raw_local_irq_restore((flags & ~(1 << 9)) | (1 << 18)); } while (0)
+#define raw_local_irq_enable()  do { unsigned long flags; raw_local_save_flags(flags); raw_local_irq_restore((flags | (1 << 9)) & ~(1 << 18)); } while (0)
+
+#define raw_irqs_disabled_flags(flags)  \
+({                                              \
+        (flags & (1<<18)) || !(flags & (1<<9)); \
+})
+
+/* For spinlocks etc */
+#define raw_local_irq_save(x)   do { raw_local_save_flags(x); raw_local_irq_restore((x & ~(1 << 9)) | (1 << 18)); } while (0)
+#else  /* CONFIG_X86_VSMP */
+#define raw_local_irq_disable()         __asm__ __volatile__("cli": : :"memory")
+#define raw_local_irq_enable()  __asm__ __volatile__("sti": : :"memory")
+
+#define raw_irqs_disabled_flags(flags)  \
+({                                              \
+        !(flags & (1<<9));                      \
+})
+
+/* For spinlocks etc */
+#define raw_local_irq_save(x)   do { warn_if_not_ulong(x); __asm__ __volatile__("# raw_local_irq_save \n\t pushfq ; popq %0 ; cli":"=g" (x): /* no input */ :"memory"); } while (0)
+#endif
+
+#define raw_irqs_disabled()                     \
+({                                              \
+        unsigned long flags;                    \
+        raw_local_save_flags(flags);            \
+        raw_irqs_disabled_flags(flags);         \
+})
+
+/* used in the idle loop; sti takes one instruction cycle to complete */
+#define raw_safe_halt() __asm__ __volatile__("sti; hlt": : :"memory")
+/* used when interrupts are already enabled or to shutdown the processor */
+#define halt()                  __asm__ __volatile__("hlt": : :"memory")
+
+#else /* __ASSEMBLY__: */
+# define TRACE_IRQS_ON
+# define TRACE_IRQS_OFF
+#endif
+
+#endif