[tip: perf/core] perf/x86/uncore: Factor out uncore_device_to_die()

[tip-bot2 for Kan Liang]

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

Commit-ID:     dbf061b26221fa1a99e6489dd61f5b4ee97a24e8
Gitweb:        https://git.kernel.org/tip/dbf061b26221fa1a99e6489dd61f5b4ee97a24e8
Author:        Kan Liang <kan.liang@xxxxxxxxxxxxxxx>
AuthorDate:    Thu, 12 Jan 2023 12:01:01 -08:00
Committer:     Peter Zijlstra <peterz@xxxxxxxxxxxxx>
CommitterDate: Sat, 21 Jan 2023 00:06:11 +01:00

perf/x86/uncore: Factor out uncore_device_to_die()

The same code is used to retrieve the logical die ID with a given PCI
device in both the discovery code and the code that supports a system
with > 8 nodes.

Factor out uncore_device_to_die() to replace the duplicate code.

No functional change.

Signed-off-by: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Tested-by: Michael Petlan <mpetlan@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20230112200105.733466-2-kan.liang@xxxxxxxxxxxxxxx
---
 arch/x86/events/intel/uncore.c           | 15 +++++++++++++++
 arch/x86/events/intel/uncore.h           |  1 +
 arch/x86/events/intel/uncore_discovery.c | 16 ++--------------
 arch/x86/events/intel/uncore_snbep.c     | 12 +-----------
 4 files changed, 19 insertions(+), 25 deletions(-)

diff --git a/arch/x86/events/intel/uncore.c b/arch/x86/events/intel/uncore.c
index 459b1aa..eeaa92f 100644
--- a/arch/x86/events/intel/uncore.c
+++ b/arch/x86/events/intel/uncore.c
@@ -65,6 +65,21 @@ int uncore_die_to_segment(int die)
 	return bus ? pci_domain_nr(bus) : -EINVAL;
 }
 
+int uncore_device_to_die(struct pci_dev *dev)
+{
+	int node = pcibus_to_node(dev->bus);
+	int cpu;
+
+	for_each_cpu(cpu, cpumask_of_pcibus(dev->bus)) {
+		struct cpuinfo_x86 *c = &cpu_data(cpu);
+
+		if (c->initialized && cpu_to_node(cpu) == node)
+			return c->logical_die_id;
+	}
+
+	return -1;
+}
+
 static void uncore_free_pcibus_map(void)
 {
 	struct pci2phy_map *map, *tmp;
diff --git a/arch/x86/events/intel/uncore.h b/arch/x86/events/intel/uncore.h
index e278e2e..8d493be 100644
--- a/arch/x86/events/intel/uncore.h
+++ b/arch/x86/events/intel/uncore.h
@@ -208,6 +208,7 @@ struct pci2phy_map {
 struct pci2phy_map *__find_pci2phy_map(int segment);
 int uncore_pcibus_to_dieid(struct pci_bus *bus);
 int uncore_die_to_segment(int die);
+int uncore_device_to_die(struct pci_dev *dev);
 
 ssize_t uncore_event_show(struct device *dev,
 			  struct device_attribute *attr, char *buf);
diff --git a/arch/x86/events/intel/uncore_discovery.c b/arch/x86/events/intel/uncore_discovery.c
index 5fd72d4..08af92a 100644
--- a/arch/x86/events/intel/uncore_discovery.c
+++ b/arch/x86/events/intel/uncore_discovery.c
@@ -33,7 +33,7 @@ static int logical_die_id;
 
 static int get_device_die_id(struct pci_dev *dev)
 {
-	int cpu, node = pcibus_to_node(dev->bus);
+	int node = pcibus_to_node(dev->bus);
 
 	/*
 	 * If the NUMA info is not available, assume that the logical die id is
@@ -43,19 +43,7 @@ static int get_device_die_id(struct pci_dev *dev)
 	if (node < 0)
 		return logical_die_id++;
 
-	for_each_cpu(cpu, cpumask_of_node(node)) {
-		struct cpuinfo_x86 *c = &cpu_data(cpu);
-
-		if (c->initialized && cpu_to_node(cpu) == node)
-			return c->logical_die_id;
-	}
-
-	/*
-	 * All CPUs of a node may be offlined. For this case,
-	 * the PCI and MMIO type of uncore blocks which are
-	 * enumerated by the device will be unavailable.
-	 */
-	return -1;
+	return uncore_device_to_die(dev);
 }
 
 #define __node_2_type(cur)	\
diff --git a/arch/x86/events/intel/uncore_snbep.c b/arch/x86/events/intel/uncore_snbep.c
index 44c2f87..31acc96 100644
--- a/arch/x86/events/intel/uncore_snbep.c
+++ b/arch/x86/events/intel/uncore_snbep.c
@@ -1453,9 +1453,6 @@ static int snbep_pci2phy_map_init(int devid, int nodeid_loc, int idmap_loc, bool
 			}
 			raw_spin_unlock(&pci2phy_map_lock);
 		} else {
-			int node = pcibus_to_node(ubox_dev->bus);
-			int cpu;
-
 			segment = pci_domain_nr(ubox_dev->bus);
 			raw_spin_lock(&pci2phy_map_lock);
 			map = __find_pci2phy_map(segment);
@@ -1465,15 +1462,8 @@ static int snbep_pci2phy_map_init(int devid, int nodeid_loc, int idmap_loc, bool
 				break;
 			}
 
-			die_id = -1;
-			for_each_cpu(cpu, cpumask_of_pcibus(ubox_dev->bus)) {
-				struct cpuinfo_x86 *c = &cpu_data(cpu);
+			map->pbus_to_dieid[bus] = die_id = uncore_device_to_die(ubox_dev);
 
-				if (c->initialized && cpu_to_node(cpu) == node) {
-					map->pbus_to_dieid[bus] = die_id = c->logical_die_id;
-					break;
-				}
-			}
 			raw_spin_unlock(&pci2phy_map_lock);
 
 			if (WARN_ON_ONCE(die_id == -1)) {