[PATCH v5 1/3] perf/x86/intel/uncore: Cache logical pkg id in uncore driver

Prarit Bhargava
2017-11-05T16:54:43Z

From: Andi Kleen <ak@linux.intel.com>

The SNB-EP uncore driver is the only user of topology_phys_to_logical_pkg
in a performance critical path. Change it query the logical pkg ID
only once at initialization time and then cache it in box structure.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: x86@kernel.org
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Piotr Luc <piotr.luc@intel.com>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: Stephane Eranian <eranian@google.com>
Cc: Prarit Bhargava <prarit@redhat.com>
Cc: Arvind Yadav <arvind.yadav.cs@gmail.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: He Chen <he.chen@linux.intel.com>
Cc: Mathias Krause <minipli@googlemail.com>
Cc: Tim Chen <tim.c.chen@linux.intel.com>
Cc: Vitaly Kuznetsov <vkuznets@redhat.com>
---
arch/x86/events/intel/uncore.c | 1 +
arch/x86/events/intel/uncore.h | 1 +
arch/x86/events/intel/uncore_snbep.c | 2 +-
3 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/x86/events/intel/uncore.c b/arch/x86/events/intel/uncore.c
index d45e06346f14..87ef77982248 100644
--- a/arch/x86/events/intel/uncore.c
+++ b/arch/x86/events/intel/uncore.c
@@ -947,6 +947,7 @@ static int uncore_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id

atomic_inc(&box->refcnt);
box->pci_phys_id = phys_id;
+ box->logical_pkg_id = topology_phys_to_logical_pkg(box->pci_phys_id);
box->pkgid = pkg;
box->pci_dev = pdev;
box->pmu = pmu;
diff --git a/arch/x86/events/intel/uncore.h b/arch/x86/events/intel/uncore.h
index 4364191e7c6b..cdf6f7083fe2 100644
--- a/arch/x86/events/intel/uncore.h
+++ b/arch/x86/events/intel/uncore.h
@@ -100,6 +100,7 @@ struct intel_uncore_extra_reg {

struct intel_uncore_box {
int pci_phys_id;
+ int logical_pkg_id;
int pkgid;
int n_active; /* number of active events */
int n_events;
diff --git a/arch/x86/events/intel/uncore_snbep.c b/arch/x86/events/intel/uncore_snbep.c
index 95cb19f4e06f..d8e39d331ea2 100644
--- a/arch/x86/events/intel/uncore_snbep.c
+++ b/arch/x86/events/intel/uncore_snbep.c
@@ -1057,7 +1057,7 @@ static void snbep_qpi_enable_event(struct intel_uncore_box *box, struct perf_eve

if (reg1->idx != EXTRA_REG_NONE) {
int idx = box->pmu->pmu_idx + SNBEP_PCI_QPI_PORT0_FILTER;
- int pkg = topology_phys_to_logical_pkg(box->pci_phys_id);
+ int pkg = box->logical_pkg_id;
struct pci_dev *filter_pdev = uncore_extra_pci_dev[pkg].dev[idx];

if (filter_pdev) {
--
2.15.0.rc0.39.g2f0e14e64