[PATCH 1/5] perf/x86/uncore: Factor out uncore_device_to_die()

kan.liang
2022-11-29T19:10:51Z

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@linux.intel.com>
---
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 6f1ccc57a692..8caf253be1de 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 e278e2e7c051..8d493bea9eb6 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 5fd72d4b8bbb..08af92af2be2 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 44c2f879f708..31acc96ccb69 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)) {
--
2.35.1