Messages in this thread | | | Date | Thu, 9 Jan 2014 02:24:14 +0100 | From | Frederic Weisbecker <> | Subject | Re: [PATCH 1/4] perf/x86/amd: AMD support for bp_len > HW_BREAKPOINT_LEN_8 |
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On Wed, Dec 11, 2013 at 06:28:23AM -0600, suravee.suthikulpanit@amd.com wrote: > @@ -295,11 +301,17 @@ static int arch_build_bp_info(struct perf_event *bp) > break; > #endif > default: > - return -EINVAL; > + if (!is_power_of_2(bp->attr.bp_len)) > + return -EINVAL; > + if (!cpu_has_bpext) > + return -EOPNOTSUPP; > + info->mask = bp->attr.bp_len - 1; > + info->len = X86_BREAKPOINT_LEN_1;
I think I asked this before but I can't remember. So dr7 must have length as LEN_1 for breakpoint extension?
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