From d61fc44853f46fb002228b18aa5f30db21fcd4ac Mon Sep 17 00:00:00 2001 From: Pekka Paalanen Date: Mon, 12 May 2008 21:20:57 +0200 Subject: 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 Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner --- arch/x86/Kconfig.debug | 20 ++++++++------------ 1 file changed, 8 insertions(+), 12 deletions(-) (limited to 'arch/x86/Kconfig.debug') diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug index 9491c0ae03a..aa0d6462b1f 100644 --- a/arch/x86/Kconfig.debug +++ b/arch/x86/Kconfig.debug @@ -170,22 +170,19 @@ config IOMMU_LEAK config MMIOTRACE_HOOKS bool - default n config MMIOTRACE - tristate "Memory mapped IO tracing" + bool "Memory mapped IO tracing" depends on DEBUG_KERNEL && RELAY && DEBUG_FS select MMIOTRACE_HOOKS - default n + default y help - This will build a kernel module called mmiotrace. - Making this a built-in is heavily discouraged. - - Mmiotrace traces Memory Mapped I/O access and is meant for debugging - and reverse engineering. The kernel module offers wrapped - versions of the ioremap family of functions. The driver to be traced - must be modified to call these wrappers. A user space program is - required to collect the MMIO data. + Mmiotrace traces Memory Mapped I/O access and is meant for + debugging and reverse engineering. It is called from the ioremap + implementation and works via page faults. A user space program is + required to collect the MMIO data from debugfs files. + Tracing is disabled by default and can be enabled from a debugfs + file. See http://nouveau.freedesktop.org/wiki/MmioTrace If you are not helping to develop drivers, say N. @@ -193,7 +190,6 @@ config MMIOTRACE config MMIOTRACE_TEST tristate "Test module for mmiotrace" depends on MMIOTRACE && m - default n help This is a dumb module for testing mmiotrace. It is very dangerous as it will write garbage to IO memory starting at a given address. -- cgit v1.2.3