From 619e3f8d8c2c9a88ec48706524747d1ba1614655 Mon Sep 17 00:00:00 2001 From: Luming Yu Date: Fri, 29 Sep 2017 22:09:35 +0800 Subject: [PATCH v1 6/9] early pt: enable mtc freq packet enable mtc freq packet Signed-off-by: Luming Yu --- arch/x86/events/intel/early_pt.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/arch/x86/events/intel/early_pt.c b/arch/x86/events/intel/early_pt.c index 5335458..01570d2 100644 --- a/arch/x86/events/intel/early_pt.c +++ b/arch/x86/events/intel/early_pt.c @@ -56,6 +56,8 @@ static unsigned cyc_thresh_mask = 0; static unsigned mtc_freq_mask = 0; static unsigned addr_range_num = 0; +static int mtc_freq = 0; + static unsigned long pt_addr0_start = 0, pt_addr0_end = 0; static unsigned long pt_addr1_start = 0, pt_addr1_end = 0; @@ -197,6 +199,9 @@ static int start_early_pt(void *arg) } } + if (mtc_freq && ((1U << (mtc_freq - 1)) & mtc_freq_mask)) + val |= ((mtc_freq - 1) << 14) | MTC_EN; + if (wrmsrl_safe(MSR_IA32_RTIT_CTL, val) < 0) { pr_info("early_pt start failed on cpu[%d]\n", cpu); __this_cpu_write(early_pt_running, false); @@ -401,3 +406,10 @@ static int __init early_pt_addr1_end_setup(char *arg) return 0; } early_param("early_pt_addr1_end", early_pt_addr1_end_setup); + +static int __init early_pt_mtc_freq_setup(char *arg) +{ + sscanf(arg, "%d", &mtc_freq); + return 0; +} +early_param("mtc_freq", early_pt_mtc_freq_setup); -- 2.7.5