linux-kernel - [tip: perf/core] perf/x86/intel: Name the global status bit in NMI handler

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Date:   Wed, 19 Aug 2020 08:52:10 -0000
From:   "tip-bot2 for Kan Liang" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Kan Liang <kan.liang@...ux.intel.com>, x86 <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [tip: perf/core] perf/x86/intel: Name the global status bit in NMI handler

The following commit has been merged into the perf/core branch of tip:

Commit-ID:     60a2a271cf05cf046c522e1d7f62116b4bcb32a2
Gitweb:        https://git.kernel.org/tip/60a2a271cf05cf046c522e1d7f62116b4bcb32a2
Author:        Kan Liang <kan.liang@...ux.intel.com>
AuthorDate:    Thu, 23 Jul 2020 10:11:05 -07:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Tue, 18 Aug 2020 16:34:34 +02:00

perf/x86/intel: Name the global status bit in NMI handler

Magic numbers are used in the current NMI handler for the global status
bit. Use a meaningful name to replace the magic numbers to improve the
readability of the code.

Remove a Tab for all GLOBAL_STATUS_* and INTEL_PMC_IDX_FIXED_BTS macros
to reduce the length of the line.

Suggested-by: Peter Zijlstra <peterz@...radead.org>
Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Link: https://lkml.kernel.org/r/20200723171117.9918-3-kan.liang@linux.intel.com
---
 arch/x86/events/intel/core.c      |  4 ++--
 arch/x86/include/asm/perf_event.h | 22 ++++++++++++----------
 2 files changed, 14 insertions(+), 12 deletions(-)

diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
index 5096347..ac1408f 100644
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -2389,7 +2389,7 @@ static int handle_pmi_common(struct pt_regs *regs, u64 status)
 	/*
 	 * PEBS overflow sets bit 62 in the global status register
 	 */
-	if (__test_and_clear_bit(62, (unsigned long *)&status)) {
+	if (__test_and_clear_bit(GLOBAL_STATUS_BUFFER_OVF_BIT, (unsigned long *)&status)) {
 		u64 pebs_enabled = cpuc->pebs_enabled;
 
 		handled++;
@@ -2410,7 +2410,7 @@ static int handle_pmi_common(struct pt_regs *regs, u64 status)
 	/*
 	 * Intel PT
 	 */
-	if (__test_and_clear_bit(55, (unsigned long *)&status)) {
+	if (__test_and_clear_bit(GLOBAL_STATUS_TRACE_TOPAPMI_BIT, (unsigned long *)&status)) {
 		handled++;
 		if (unlikely(perf_guest_cbs && perf_guest_cbs->is_in_guest() &&
 			perf_guest_cbs->handle_intel_pt_intr))
diff --git a/arch/x86/include/asm/perf_event.h b/arch/x86/include/asm/perf_event.h
index 0c1b137..fd3eba6 100644
--- a/arch/x86/include/asm/perf_event.h
+++ b/arch/x86/include/asm/perf_event.h
@@ -225,16 +225,18 @@ struct x86_pmu_capability {
  * values are used by actual fixed events and higher values are used
  * to indicate other overflow conditions in the PERF_GLOBAL_STATUS msr.
  */
-#define INTEL_PMC_IDX_FIXED_BTS				(INTEL_PMC_IDX_FIXED + 16)
-
-#define GLOBAL_STATUS_COND_CHG				BIT_ULL(63)
-#define GLOBAL_STATUS_BUFFER_OVF			BIT_ULL(62)
-#define GLOBAL_STATUS_UNC_OVF				BIT_ULL(61)
-#define GLOBAL_STATUS_ASIF				BIT_ULL(60)
-#define GLOBAL_STATUS_COUNTERS_FROZEN			BIT_ULL(59)
-#define GLOBAL_STATUS_LBRS_FROZEN_BIT			58
-#define GLOBAL_STATUS_LBRS_FROZEN			BIT_ULL(GLOBAL_STATUS_LBRS_FROZEN_BIT)
-#define GLOBAL_STATUS_TRACE_TOPAPMI			BIT_ULL(55)
+#define INTEL_PMC_IDX_FIXED_BTS			(INTEL_PMC_IDX_FIXED + 16)
+
+#define GLOBAL_STATUS_COND_CHG			BIT_ULL(63)
+#define GLOBAL_STATUS_BUFFER_OVF_BIT		62
+#define GLOBAL_STATUS_BUFFER_OVF		BIT_ULL(GLOBAL_STATUS_BUFFER_OVF_BIT)
+#define GLOBAL_STATUS_UNC_OVF			BIT_ULL(61)
+#define GLOBAL_STATUS_ASIF			BIT_ULL(60)
+#define GLOBAL_STATUS_COUNTERS_FROZEN		BIT_ULL(59)
+#define GLOBAL_STATUS_LBRS_FROZEN_BIT		58
+#define GLOBAL_STATUS_LBRS_FROZEN		BIT_ULL(GLOBAL_STATUS_LBRS_FROZEN_BIT)
+#define GLOBAL_STATUS_TRACE_TOPAPMI_BIT		55
+#define GLOBAL_STATUS_TRACE_TOPAPMI		BIT_ULL(GLOBAL_STATUS_TRACE_TOPAPMI_BIT)
 
 /*
  * We model guest LBR event tracing as another fixed-mode PMC like BTS.