hw-breakpoints: introducing generic hardware breakpoint handler interfaces

This patch introduces the generic Hardware Breakpoint interfaces for both user
and kernel space requests.
This core Api handles the hardware breakpoints through new helpers. It
handles the user-space breakpoints and kernel breakpoints in front of
arch implementation.

One can choose kernel wide breakpoints using the following helpers
and passing them a generic struct hw_breakpoint:

- register_kernel_hw_breakpoint()
- unregister_kernel_hw_breakpoint()
- modify_kernel_hw_breakpoint()

On the other side, you can choose per task breakpoints.

- register_user_hw_breakpoint()
- unregister_user_hw_breakpoint()
- modify_user_hw_breakpoint()

[ fweisbec@gmail.com: fix conflict against perfcounter ]

Original-patch-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: K.Prasad <prasad@linux.vnet.ibm.com>
Reviewed-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/arch/Kconfig b/arch/Kconfig
index 78a35e9dc104..1adf2d0e6356 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -112,3 +112,7 @@ config HAVE_DMA_API_DEBUG
 
 config HAVE_DEFAULT_NO_SPIN_MUTEXES
         bool
+
+config HAVE_HW_BREAKPOINT
+        bool
+