x86: mmiotrace, preview 2

Kconfig.debug, Makefile and testmmiotrace.c style fixes.
Use real mutex instead of mutex.
Fix failure path in register probe func.
kmmio: RCU read-locked over single stepping.
Generate mapping id's.
Make mmio-mod.c built-in and rewrite its locking.
Add debugfs file to enable/disable mmiotracing.
kmmio: use irqsave spinlocks.
Lots of cleanups in mmio-mod.c
Marker file moved from /proc into debugfs.
Call mmiotrace entrypoints directly from ioremap.c.

Signed-off-by: Pekka Paalanen <pq@iki.fi>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 17 insertions, 1 deletions

diff --git a/include/linux/mmiotrace.h b/include/linux/mmiotrace.h
index d87a6cd8b686..cb5efd0c7f51 100644
--- a/include/linux/mmiotrace.h
+++ b/include/linux/mmiotrace.h
@@ -16,11 +16,12 @@ typedef void (*kmmio_post_handler_t)(struct kmmio_probe *,
                                 unsigned long condition, struct pt_regs *);
 
 struct kmmio_probe {
-        struct list_head list;
+        struct list_head list; /* kmmio internal list */
         unsigned long addr; /* start location of the probe point */
         unsigned long len; /* length of the probe region */
         kmmio_pre_handler_t pre_handler; /* Called before addr is executed. */
         kmmio_post_handler_t post_handler; /* Called after addr is executed */
+        void *user_data;
 };
 
 /* kmmio is active by some kmmio_probes? */
@@ -38,6 +39,21 @@ extern void unregister_kmmio_probe(struct kmmio_probe *p);
 /* Called from page fault handler. */
 extern int kmmio_handler(struct pt_regs *regs, unsigned long addr);
 
+/* Called from ioremap.c */
+#ifdef CONFIG_MMIOTRACE
+extern void
+mmiotrace_ioremap(unsigned long offset, unsigned long size, void __iomem *addr);
+extern void mmiotrace_iounmap(volatile void __iomem *addr);
+#else
+static inline void
+mmiotrace_ioremap(unsigned long offset, unsigned long size, void __iomem *addr)
+{
+}
+static inline void mmiotrace_iounmap(volatile void __iomem *addr)
+{
+}
+#endif /* CONFIG_MMIOTRACE_HOOKS */
+
 #endif /* __KERNEL__ */