[PATCH 1/3] perf/x86/intel/uncore: Generalize I/O stacks to PMON mapping procedure

From: alexander . antonov
Date: Mon Apr 26 2021 - 09:16:25 EST


From: Alexander Antonov <alexander.antonov@xxxxxxxxxxxxxxx>

Currently I/O stacks to IIO PMON mapping is available on Skylake servers
only and need to make code more general to easily enable further platforms.
So, introduce get_topology() callback in struct intel_uncore_type which
allows to move common code to separate function and make mapping procedure
more general.

Cc: Steve Wahl <steve.wahl@xxxxxxx>
Reviewed-by: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>
Signed-off-by: Alexander Antonov <alexander.antonov@xxxxxxxxxxxxxxx>
---
arch/x86/events/intel/uncore.h | 1 +
arch/x86/events/intel/uncore_snbep.c | 26 ++++++++++++++++++++------
2 files changed, 21 insertions(+), 6 deletions(-)

diff --git a/arch/x86/events/intel/uncore.h b/arch/x86/events/intel/uncore.h
index 96569dc2119d..d91733337f94 100644
--- a/arch/x86/events/intel/uncore.h
+++ b/arch/x86/events/intel/uncore.h
@@ -92,6 +92,7 @@ struct intel_uncore_type {
/*
* Optional callbacks for managing mapping of Uncore units to PMONs
*/
+ int (*get_topology)(struct intel_uncore_type *type);
int (*set_mapping)(struct intel_uncore_type *type);
void (*cleanup_mapping)(struct intel_uncore_type *type);
};
diff --git a/arch/x86/events/intel/uncore_snbep.c b/arch/x86/events/intel/uncore_snbep.c
index acc3c0e52f4d..72970b4c907b 100644
--- a/arch/x86/events/intel/uncore_snbep.c
+++ b/arch/x86/events/intel/uncore_snbep.c
@@ -3689,12 +3689,19 @@ static inline u8 skx_iio_stack(struct intel_uncore_pmu *pmu, int die)
}

static umode_t
-skx_iio_mapping_visible(struct kobject *kobj, struct attribute *attr, int die)
+pmu_iio_mapping_visible(struct kobject *kobj, struct attribute *attr,
+ int die, int zero_bus_pmu)
{
struct intel_uncore_pmu *pmu = dev_to_uncore_pmu(kobj_to_dev(kobj));

- /* Root bus 0x00 is valid only for die 0 AND pmu_idx = 0. */
- return (!skx_iio_stack(pmu, die) && pmu->pmu_idx) ? 0 : attr->mode;
+ return (!skx_iio_stack(pmu, die) && pmu->pmu_idx != zero_bus_pmu) ? 0 : attr->mode;
+}
+
+static umode_t
+skx_iio_mapping_visible(struct kobject *kobj, struct attribute *attr, int die)
+{
+ /* Root bus 0x00 is valid only for pmu_idx = 0. */
+ return pmu_iio_mapping_visible(kobj, attr, die, 0);
}

static ssize_t skx_iio_mapping_show(struct device *dev,
@@ -3779,7 +3786,8 @@ static const struct attribute_group *skx_iio_attr_update[] = {
NULL,
};

-static int skx_iio_set_mapping(struct intel_uncore_type *type)
+static int
+pmu_iio_set_mapping(struct intel_uncore_type *type, struct attribute_group *ag)
{
char buf[64];
int ret;
@@ -3787,7 +3795,7 @@ static int skx_iio_set_mapping(struct intel_uncore_type *type)
struct attribute **attrs = NULL;
struct dev_ext_attribute *eas = NULL;

- ret = skx_iio_get_topology(type);
+ ret = type->get_topology(type);
if (ret < 0)
goto clear_attr_update;

@@ -3814,7 +3822,7 @@ static int skx_iio_set_mapping(struct intel_uncore_type *type)
eas[die].var = (void *)die;
attrs[die] = &eas[die].attr.attr;
}
- skx_iio_mapping_group.attrs = attrs;
+ ag->attrs = attrs;

return 0;
err:
@@ -3828,6 +3836,11 @@ static int skx_iio_set_mapping(struct intel_uncore_type *type)
return ret;
}

+static int skx_iio_set_mapping(struct intel_uncore_type *type)
+{
+ return pmu_iio_set_mapping(type, &skx_iio_mapping_group);
+}
+
static void skx_iio_cleanup_mapping(struct intel_uncore_type *type)
{
struct attribute **attr = skx_iio_mapping_group.attrs;
@@ -3858,6 +3871,7 @@ static struct intel_uncore_type skx_uncore_iio = {
.ops = &skx_uncore_iio_ops,
.format_group = &skx_uncore_iio_format_group,
.attr_update = skx_iio_attr_update,
+ .get_topology = skx_iio_get_topology,
.set_mapping = skx_iio_set_mapping,
.cleanup_mapping = skx_iio_cleanup_mapping,
};
--
2.21.3