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authorFrederic Weisbecker <fweisbec@gmail.com>2010-04-23 05:59:55 +0200
committerFrederic Weisbecker <fweisbec@gmail.com>2010-05-01 04:32:14 +0200
commitfeef47d0cb530e8419dfa0b48141b538b89b1b1a (patch)
treead40b07e8b240eca134770120b5c644ec0062ce2 /arch/x86/include/asm/hw_breakpoint.h
parentf93a20541134fa767e8dc4eb32e956d30b9f6b92 (diff)
downloadop-kernel-dev-feef47d0cb530e8419dfa0b48141b538b89b1b1a.zip
op-kernel-dev-feef47d0cb530e8419dfa0b48141b538b89b1b1a.tar.gz
hw-breakpoints: Get the number of available registers on boot dynamically
The breakpoint generic layer assumes that archs always know in advance the static number of address registers available to host breakpoints through the HBP_NUM macro. However this is not true for every archs. For example Arm needs to get this information dynamically to handle the compatiblity between different versions. To solve this, this patch proposes to drop the static HBP_NUM macro and let the arch provide the number of available slots through a new hw_breakpoint_slots() function. For archs that have CONFIG_HAVE_MIXED_BREAKPOINTS_REGS selected, it will be called once as the number of registers fits for instruction and data breakpoints together. For the others it will be called first to get the number of instruction breakpoint registers and another time to get the data breakpoint registers, the targeted type is given as a parameter of hw_breakpoint_slots(). Reported-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Acked-by: Paul Mundt <lethal@linux-sh.org> Cc: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com> Cc: K. Prasad <prasad@linux.vnet.ibm.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Jason Wessel <jason.wessel@windriver.com> Cc: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/include/asm/hw_breakpoint.h')
-rw-r--r--arch/x86/include/asm/hw_breakpoint.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/x86/include/asm/hw_breakpoint.h b/arch/x86/include/asm/hw_breakpoint.h
index c77a5a6..9422553 100644
--- a/arch/x86/include/asm/hw_breakpoint.h
+++ b/arch/x86/include/asm/hw_breakpoint.h
@@ -41,6 +41,11 @@ struct arch_hw_breakpoint {
/* Total number of available HW breakpoint registers */
#define HBP_NUM 4
+static inline int hw_breakpoint_slots(int type)
+{
+ return HBP_NUM;
+}
+
struct perf_event;
struct pmu;
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