diff options
4 files changed, 121 insertions, 4 deletions
diff --git a/Documentation/admin-guide/pm/intel_uncore_frequency_scaling.rst b/Documentation/admin-guide/pm/intel_uncore_frequency_scaling.rst index 09169d935835..5ab3440e6cee 100644 --- a/Documentation/admin-guide/pm/intel_uncore_frequency_scaling.rst +++ b/Documentation/admin-guide/pm/intel_uncore_frequency_scaling.rst @@ -5,7 +5,7 @@ Intel Uncore Frequency Scaling ============================== -:Copyright: |copy| 2022 Intel Corporation +:Copyright: |copy| 2022-2023 Intel Corporation :Author: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> @@ -58,3 +58,58 @@ Each package_*_die_* contains the following attributes: ``current_freq_khz`` This attribute is used to get the current uncore frequency. + +SoCs with TPMI (Topology Aware Register and PM Capsule Interface) +----------------------------------------------------------------- + +An SoC can contain multiple power domains with individual or collection +of mesh partitions. This partition is called fabric cluster. + +Certain type of meshes will need to run at the same frequency, they will +be placed in the same fabric cluster. Benefit of fabric cluster is that it +offers a scalable mechanism to deal with partitioned fabrics in a SoC. + +The current sysfs interface supports controls at package and die level. +This interface is not enough to support more granular control at +fabric cluster level. + +SoCs with the support of TPMI (Topology Aware Register and PM Capsule +Interface), can have multiple power domains. Each power domain can +contain one or more fabric clusters. + +To represent controls at fabric cluster level in addition to the +controls at package and die level (like systems without TPMI +support), sysfs is enhanced. This granular interface is presented in the +sysfs with directories names prefixed with "uncore". For example: +uncore00, uncore01 etc. + +The scope of control is specified by attributes "package_id", "domain_id" +and "fabric_cluster_id" in the directory. + +Attributes in each directory: + +``domain_id`` + This attribute is used to get the power domain id of this instance. + +``fabric_cluster_id`` + This attribute is used to get the fabric cluster id of this instance. + +``package_id`` + This attribute is used to get the package id of this instance. + +The other attributes are same as presented at package_*_die_* level. + +In most of current use cases, the "max_freq_khz" and "min_freq_khz" +is updated at "package_*_die_*" level. This model will be still supported +with the following approach: + +When user uses controls at "package_*_die_*" level, then every fabric +cluster is affected in that package and die. For example: user changes +"max_freq_khz" in the package_00_die_00, then "max_freq_khz" for uncore* +directory with the same package id will be updated. In this case user can +still update "max_freq_khz" at each uncore* level, which is more restrictive. +Similarly, user can update "min_freq_khz" at "package_*_die_*" level +to apply at each uncore* level. + +Support for "current_freq_khz" is available only at each fabric cluster +level (i.e., in uncore* directory). diff --git a/drivers/platform/x86/intel/uncore-frequency/uncore-frequency-common.c b/drivers/platform/x86/intel/uncore-frequency/uncore-frequency-common.c index 064f186ae81b..1152deaa0078 100644 --- a/drivers/platform/x86/intel/uncore-frequency/uncore-frequency-common.c +++ b/drivers/platform/x86/intel/uncore-frequency/uncore-frequency-common.c @@ -16,11 +16,34 @@ static struct kobject *uncore_root_kobj; /* uncore instance count */ static int uncore_instance_count; +static DEFINE_IDA(intel_uncore_ida); + /* callbacks for actual HW read/write */ static int (*uncore_read)(struct uncore_data *data, unsigned int *min, unsigned int *max); static int (*uncore_write)(struct uncore_data *data, unsigned int input, unsigned int min_max); static int (*uncore_read_freq)(struct uncore_data *data, unsigned int *freq); +static ssize_t show_domain_id(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct uncore_data *data = container_of(attr, struct uncore_data, domain_id_dev_attr); + + return sprintf(buf, "%u\n", data->domain_id); +} + +static ssize_t show_fabric_cluster_id(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct uncore_data *data = container_of(attr, struct uncore_data, fabric_cluster_id_dev_attr); + + return sprintf(buf, "%u\n", data->cluster_id); +} + +static ssize_t show_package_id(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct uncore_data *data = container_of(attr, struct uncore_data, package_id_dev_attr); + + return sprintf(buf, "%u\n", data->package_id); +} + static ssize_t show_min_max_freq_khz(struct uncore_data *data, char *buf, int min_max) { @@ -161,6 +184,15 @@ static int create_attr_group(struct uncore_data *data, char *name) init_attribute_ro(initial_max_freq_khz); init_attribute_root_ro(current_freq_khz); + if (data->domain_id != UNCORE_DOMAIN_ID_INVALID) { + init_attribute_root_ro(domain_id); + data->uncore_attrs[index++] = &data->domain_id_dev_attr.attr; + init_attribute_root_ro(fabric_cluster_id); + data->uncore_attrs[index++] = &data->fabric_cluster_id_dev_attr.attr; + init_attribute_root_ro(package_id); + data->uncore_attrs[index++] = &data->package_id_dev_attr.attr; + } + data->uncore_attrs[index++] = &data->max_freq_khz_dev_attr.attr; data->uncore_attrs[index++] = &data->min_freq_khz_dev_attr.attr; data->uncore_attrs[index++] = &data->initial_min_freq_khz_dev_attr.attr; @@ -191,12 +223,24 @@ int uncore_freq_add_entry(struct uncore_data *data, int cpu) goto uncore_unlock; } - sprintf(data->name, "package_%02d_die_%02d", data->package_id, data->die_id); + if (data->domain_id != UNCORE_DOMAIN_ID_INVALID) { + ret = ida_alloc(&intel_uncore_ida, GFP_KERNEL); + if (ret < 0) + goto uncore_unlock; + + data->instance_id = ret; + sprintf(data->name, "uncore%02d", ret); + } else { + sprintf(data->name, "package_%02d_die_%02d", data->package_id, data->die_id); + } uncore_read(data, &data->initial_min_freq_khz, &data->initial_max_freq_khz); ret = create_attr_group(data, data->name); - if (!ret) { + if (ret) { + if (data->domain_id != UNCORE_DOMAIN_ID_INVALID) + ida_free(&intel_uncore_ida, data->instance_id); + } else { data->control_cpu = cpu; data->valid = true; } @@ -214,6 +258,9 @@ void uncore_freq_remove_die_entry(struct uncore_data *data) delete_attr_group(data, data->name); data->control_cpu = -1; data->valid = false; + if (data->domain_id != UNCORE_DOMAIN_ID_INVALID) + ida_free(&intel_uncore_ida, data->instance_id); + mutex_unlock(&uncore_lock); } EXPORT_SYMBOL_NS_GPL(uncore_freq_remove_die_entry, INTEL_UNCORE_FREQUENCY); diff --git a/drivers/platform/x86/intel/uncore-frequency/uncore-frequency-common.h b/drivers/platform/x86/intel/uncore-frequency/uncore-frequency-common.h index f5dcfa2fb285..7afb69977c7e 100644 --- a/drivers/platform/x86/intel/uncore-frequency/uncore-frequency-common.h +++ b/drivers/platform/x86/intel/uncore-frequency/uncore-frequency-common.h @@ -21,6 +21,9 @@ * @valid: Mark the data valid/invalid * @package_id: Package id for this instance * @die_id: Die id for this instance + * @domain_id: Power domain id for this instance + * @cluster_id: cluster id in a domain + * @instance_id: Unique instance id to append to directory name * @name: Sysfs entry name for this instance * @uncore_attr_group: Attribute group storage * @max_freq_khz_dev_attr: Storage for device attribute max_freq_khz @@ -28,6 +31,9 @@ * @initial_max_freq_khz_dev_attr: Storage for device attribute initial_max_freq_khz * @initial_min_freq_khz_dev_attr: Storage for device attribute initial_min_freq_khz * @current_freq_khz_dev_attr: Storage for device attribute current_freq_khz + * @domain_id_dev_attr: Storage for device attribute domain_id + * @fabric_cluster_id_dev_attr: Storage for device attribute fabric_cluster_id + * @package_id_dev_attr: Storage for device attribute package_id * @uncore_attrs: Attribute storage for group creation * * This structure is used to encapsulate all data related to uncore sysfs @@ -41,6 +47,9 @@ struct uncore_data { bool valid; int package_id; int die_id; + int domain_id; + int cluster_id; + int instance_id; char name[32]; struct attribute_group uncore_attr_group; @@ -49,9 +58,14 @@ struct uncore_data { struct device_attribute initial_max_freq_khz_dev_attr; struct device_attribute initial_min_freq_khz_dev_attr; struct device_attribute current_freq_khz_dev_attr; - struct attribute *uncore_attrs[6]; + struct device_attribute domain_id_dev_attr; + struct device_attribute fabric_cluster_id_dev_attr; + struct device_attribute package_id_dev_attr; + struct attribute *uncore_attrs[9]; }; +#define UNCORE_DOMAIN_ID_INVALID -1 + int uncore_freq_common_init(int (*read_control_freq)(struct uncore_data *data, unsigned int *min, unsigned int *max), int (*write_control_freq)(struct uncore_data *data, unsigned int input, unsigned int min_max), int (*uncore_read_freq)(struct uncore_data *data, unsigned int *freq)); diff --git a/drivers/platform/x86/intel/uncore-frequency/uncore-frequency.c b/drivers/platform/x86/intel/uncore-frequency/uncore-frequency.c index 32e2515ee366..a3b25253b6fd 100644 --- a/drivers/platform/x86/intel/uncore-frequency/uncore-frequency.c +++ b/drivers/platform/x86/intel/uncore-frequency/uncore-frequency.c @@ -136,6 +136,7 @@ static int uncore_event_cpu_online(unsigned int cpu) data->package_id = topology_physical_package_id(cpu); data->die_id = topology_die_id(cpu); + data->domain_id = UNCORE_DOMAIN_ID_INVALID; return uncore_freq_add_entry(data, cpu); } |