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hw-breakpoints: Use struct perf_event_attr to define kernel breakpoints

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Kernel breakpoints are created using functions in which we pass
breakpoint parameters as individual variables: address, length
and type.

Although it fits well for x86, this just does not scale across
architectures that may support this api later as these may have
more or different needs. Pass in a perf_event_attr structure
instead because it is meant to evolve as much as possible into
a generic hardware breakpoint parameter structure.

Reported-by: K.Prasad <prasad@linux.vnet.ibm.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <1259294154-5197-2-git-send-regression-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Frederic Weisbecker
2009-11-27 04:55:54 +01:00
committed by Ingo Molnar
parent 5fa10b28e5
commit dd1853c3f4
4 changed files with 44 additions and 78 deletions
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10
samples/hw_breakpoint/data_breakpoint.c
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@ -51,13 +51,13 @@ static void sample_hbp_handler(struct perf_event *temp, void *data)
static int __init hw_break_module_init(void)
{
int ret;
unsigned long addr;
DEFINE_BREAKPOINT_ATTR(attr);
addr = kallsyms_lookup_name(ksym_name);
attr.bp_addr = kallsyms_lookup_name(ksym_name);
attr.bp_len = HW_BREAKPOINT_LEN_4;
attr.bp_type = HW_BREAKPOINT_W | HW_BREAKPOINT_R;
sample_hbp = register_wide_hw_breakpoint(addr, HW_BREAKPOINT_LEN_4,
HW_BREAKPOINT_W | HW_BREAKPOINT_R,
sample_hbp_handler, true);
sample_hbp = register_wide_hw_breakpoint(&attr, sample_hbp_handler);
if (IS_ERR(sample_hbp)) {
ret = PTR_ERR(sample_hbp);
goto fail;