From: Kan Liang kan.liang@linux.intel.com
[ Upstream commit 8f5d41f3a0f495435c88ebba8fc150c931c10fef ]
There are some updates for the Icelake model specific uncore performance monitors. (The update can be found at 10th generation intel core processors families specification update Revision 004, ICL068)
1) Counter 0 of ARB uncore unit is not available for software use 2) The global 'enable bit' (bit 29) and 'freeze bit' (bit 31) of MSR_UNC_PERF_GLOBAL_CTRL cannot be used to control counter behavior. Needs to use local enable in event select MSR.
Accessing the modified bit/registers will be ignored by HW. Users may observe inaccurate results with the current code.
The changes of the MSR_UNC_PERF_GLOBAL_CTRL imply that groups cannot be read atomically anymore. Although the error of the result for a group becomes a bit bigger, it still far lower than not using a group. The group support is still kept. Only Remove the *_box() related implementation.
Since the counter 0 of ARB uncore unit is not available, update the MSR address for the ARB uncore unit.
There is no change for IMC uncore unit, which only include free-running counters.
Fixes: 6e394376ee89 ("perf/x86/intel/uncore: Add Intel Icelake uncore support") Signed-off-by: Kan Liang kan.liang@linux.intel.com Signed-off-by: Peter Zijlstra (Intel) peterz@infradead.org Link: https://lkml.kernel.org/r/20200925134905.8839-2-kan.liang@linux.intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- arch/x86/events/intel/uncore_snb.c | 29 +++++++++++++++++++++++++---- 1 file changed, 25 insertions(+), 4 deletions(-)
diff --git a/arch/x86/events/intel/uncore_snb.c b/arch/x86/events/intel/uncore_snb.c index 1038e9f1e3542..300937cc8795b 100644 --- a/arch/x86/events/intel/uncore_snb.c +++ b/arch/x86/events/intel/uncore_snb.c @@ -115,6 +115,10 @@ #define ICL_UNC_CBO_0_PER_CTR0 0x702 #define ICL_UNC_CBO_MSR_OFFSET 0x8
+/* ICL ARB register */ +#define ICL_UNC_ARB_PER_CTR 0x3b1 +#define ICL_UNC_ARB_PERFEVTSEL 0x3b3 + DEFINE_UNCORE_FORMAT_ATTR(event, event, "config:0-7"); DEFINE_UNCORE_FORMAT_ATTR(umask, umask, "config:8-15"); DEFINE_UNCORE_FORMAT_ATTR(edge, edge, "config:18"); @@ -302,6 +306,12 @@ void skl_uncore_cpu_init(void) snb_uncore_arb.ops = &skl_uncore_msr_ops; }
+static struct intel_uncore_ops icl_uncore_msr_ops = { + .disable_event = snb_uncore_msr_disable_event, + .enable_event = snb_uncore_msr_enable_event, + .read_counter = uncore_msr_read_counter, +}; + static struct intel_uncore_type icl_uncore_cbox = { .name = "cbox", .num_counters = 4, @@ -310,7 +320,7 @@ static struct intel_uncore_type icl_uncore_cbox = { .event_ctl = SNB_UNC_CBO_0_PERFEVTSEL0, .event_mask = SNB_UNC_RAW_EVENT_MASK, .msr_offset = ICL_UNC_CBO_MSR_OFFSET, - .ops = &skl_uncore_msr_ops, + .ops = &icl_uncore_msr_ops, .format_group = &snb_uncore_format_group, };
@@ -339,13 +349,25 @@ static struct intel_uncore_type icl_uncore_clockbox = { .single_fixed = 1, .event_mask = SNB_UNC_CTL_EV_SEL_MASK, .format_group = &icl_uncore_clock_format_group, - .ops = &skl_uncore_msr_ops, + .ops = &icl_uncore_msr_ops, .event_descs = icl_uncore_events, };
+static struct intel_uncore_type icl_uncore_arb = { + .name = "arb", + .num_counters = 1, + .num_boxes = 1, + .perf_ctr_bits = 44, + .perf_ctr = ICL_UNC_ARB_PER_CTR, + .event_ctl = ICL_UNC_ARB_PERFEVTSEL, + .event_mask = SNB_UNC_RAW_EVENT_MASK, + .ops = &icl_uncore_msr_ops, + .format_group = &snb_uncore_format_group, +}; + static struct intel_uncore_type *icl_msr_uncores[] = { &icl_uncore_cbox, - &snb_uncore_arb, + &icl_uncore_arb, &icl_uncore_clockbox, NULL, }; @@ -363,7 +385,6 @@ void icl_uncore_cpu_init(void) { uncore_msr_uncores = icl_msr_uncores; icl_uncore_cbox.num_boxes = icl_get_cbox_num(); - snb_uncore_arb.ops = &skl_uncore_msr_ops; }
enum {