forked from mirrors/linux
0336bdfd73
Adds a method to select a suitable sink connected to a given source. In cases where no sink is defined, the coresight_find_default_sink routine can search from a given source, through the child connections until a suitable sink is found. The suitability is defined in by the sink coresight_dev_subtype on the CoreSight device, and the distance from the source by counting connections. Higher value subtype is preferred - where these are equal, shorter distance from source is used as a tie-break. This allows for default sink to be discovered were none is specified (e.g. perf command line) Signed-off-by: Mike Leach <mike.leach@linaro.org> Suggested-by: Suzuki K Poulose <suzuki.poulose@arm.com> Reviewed-by: Leo Yan <leo.yan@linaro.org> Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20200716175746.3338735-15-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
377 lines
12 KiB
C
377 lines
12 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (c) 2012, The Linux Foundation. All rights reserved.
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*/
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#ifndef _LINUX_CORESIGHT_H
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#define _LINUX_CORESIGHT_H
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#include <linux/device.h>
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#include <linux/perf_event.h>
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#include <linux/sched.h>
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/* Peripheral id registers (0xFD0-0xFEC) */
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#define CORESIGHT_PERIPHIDR4 0xfd0
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#define CORESIGHT_PERIPHIDR5 0xfd4
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#define CORESIGHT_PERIPHIDR6 0xfd8
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#define CORESIGHT_PERIPHIDR7 0xfdC
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#define CORESIGHT_PERIPHIDR0 0xfe0
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#define CORESIGHT_PERIPHIDR1 0xfe4
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#define CORESIGHT_PERIPHIDR2 0xfe8
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#define CORESIGHT_PERIPHIDR3 0xfeC
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/* Component id registers (0xFF0-0xFFC) */
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#define CORESIGHT_COMPIDR0 0xff0
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#define CORESIGHT_COMPIDR1 0xff4
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#define CORESIGHT_COMPIDR2 0xff8
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#define CORESIGHT_COMPIDR3 0xffC
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#define ETM_ARCH_V3_3 0x23
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#define ETM_ARCH_V3_5 0x25
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#define PFT_ARCH_V1_0 0x30
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#define PFT_ARCH_V1_1 0x31
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#define CORESIGHT_UNLOCK 0xc5acce55
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extern struct bus_type coresight_bustype;
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enum coresight_dev_type {
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CORESIGHT_DEV_TYPE_NONE,
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CORESIGHT_DEV_TYPE_SINK,
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CORESIGHT_DEV_TYPE_LINK,
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CORESIGHT_DEV_TYPE_LINKSINK,
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CORESIGHT_DEV_TYPE_SOURCE,
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CORESIGHT_DEV_TYPE_HELPER,
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CORESIGHT_DEV_TYPE_ECT,
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};
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enum coresight_dev_subtype_sink {
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CORESIGHT_DEV_SUBTYPE_SINK_NONE,
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CORESIGHT_DEV_SUBTYPE_SINK_PORT,
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CORESIGHT_DEV_SUBTYPE_SINK_BUFFER,
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CORESIGHT_DEV_SUBTYPE_SINK_SYSMEM,
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};
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enum coresight_dev_subtype_link {
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CORESIGHT_DEV_SUBTYPE_LINK_NONE,
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CORESIGHT_DEV_SUBTYPE_LINK_MERG,
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CORESIGHT_DEV_SUBTYPE_LINK_SPLIT,
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CORESIGHT_DEV_SUBTYPE_LINK_FIFO,
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};
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enum coresight_dev_subtype_source {
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CORESIGHT_DEV_SUBTYPE_SOURCE_NONE,
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CORESIGHT_DEV_SUBTYPE_SOURCE_PROC,
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CORESIGHT_DEV_SUBTYPE_SOURCE_BUS,
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CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE,
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};
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enum coresight_dev_subtype_helper {
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CORESIGHT_DEV_SUBTYPE_HELPER_NONE,
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CORESIGHT_DEV_SUBTYPE_HELPER_CATU,
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};
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/* Embedded Cross Trigger (ECT) sub-types */
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enum coresight_dev_subtype_ect {
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CORESIGHT_DEV_SUBTYPE_ECT_NONE,
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CORESIGHT_DEV_SUBTYPE_ECT_CTI,
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};
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/**
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* union coresight_dev_subtype - further characterisation of a type
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* @sink_subtype: type of sink this component is, as defined
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* by @coresight_dev_subtype_sink.
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* @link_subtype: type of link this component is, as defined
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* by @coresight_dev_subtype_link.
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* @source_subtype: type of source this component is, as defined
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* by @coresight_dev_subtype_source.
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* @helper_subtype: type of helper this component is, as defined
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* by @coresight_dev_subtype_helper.
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* @ect_subtype: type of cross trigger this component is, as
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* defined by @coresight_dev_subtype_ect
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*/
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union coresight_dev_subtype {
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/* We have some devices which acts as LINK and SINK */
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struct {
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enum coresight_dev_subtype_sink sink_subtype;
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enum coresight_dev_subtype_link link_subtype;
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};
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enum coresight_dev_subtype_source source_subtype;
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enum coresight_dev_subtype_helper helper_subtype;
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enum coresight_dev_subtype_ect ect_subtype;
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};
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/**
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* struct coresight_platform_data - data harvested from the firmware
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* specification.
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*
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* @nr_inport: Number of elements for the input connections.
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* @nr_outport: Number of elements for the output connections.
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* @conns: Sparse array of nr_outport connections from this component.
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*/
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struct coresight_platform_data {
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int nr_inport;
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int nr_outport;
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struct coresight_connection *conns;
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};
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/**
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* struct coresight_desc - description of a component required from drivers
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* @type: as defined by @coresight_dev_type.
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* @subtype: as defined by @coresight_dev_subtype.
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* @ops: generic operations for this component, as defined
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* by @coresight_ops.
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* @pdata: platform data collected from DT.
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* @dev: The device entity associated to this component.
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* @groups: operations specific to this component. These will end up
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* in the component's sysfs sub-directory.
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* @name: name for the coresight device, also shown under sysfs.
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*/
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struct coresight_desc {
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enum coresight_dev_type type;
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union coresight_dev_subtype subtype;
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const struct coresight_ops *ops;
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struct coresight_platform_data *pdata;
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struct device *dev;
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const struct attribute_group **groups;
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const char *name;
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};
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/**
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* struct coresight_connection - representation of a single connection
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* @outport: a connection's output port number.
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* @child_port: remote component's port number @output is connected to.
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* @chid_fwnode: remote component's fwnode handle.
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* @child_dev: a @coresight_device representation of the component
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connected to @outport.
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* @link: Representation of the connection as a sysfs link.
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*/
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struct coresight_connection {
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int outport;
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int child_port;
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struct fwnode_handle *child_fwnode;
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struct coresight_device *child_dev;
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struct coresight_sysfs_link *link;
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};
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/**
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* struct coresight_sysfs_link - representation of a connection in sysfs.
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* @orig: Originating (master) coresight device for the link.
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* @orig_name: Name to use for the link orig->target.
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* @target: Target (slave) coresight device for the link.
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* @target_name: Name to use for the link target->orig.
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*/
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struct coresight_sysfs_link {
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struct coresight_device *orig;
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const char *orig_name;
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struct coresight_device *target;
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const char *target_name;
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};
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/**
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* struct coresight_device - representation of a device as used by the framework
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* @pdata: Platform data with device connections associated to this device.
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* @type: as defined by @coresight_dev_type.
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* @subtype: as defined by @coresight_dev_subtype.
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* @ops: generic operations for this component, as defined
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by @coresight_ops.
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* @dev: The device entity associated to this component.
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* @refcnt: keep track of what is in use.
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* @orphan: true if the component has connections that haven't been linked.
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* @enable: 'true' if component is currently part of an active path.
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* @activated: 'true' only if a _sink_ has been activated. A sink can be
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* activated but not yet enabled. Enabling for a _sink_
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* happens when a source has been selected and a path is enabled
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* from source to that sink.
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* @ea: Device attribute for sink representation under PMU directory.
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* @def_sink: cached reference to default sink found for this device.
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* @ect_dev: Associated cross trigger device. Not part of the trace data
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* path or connections.
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* @nr_links: number of sysfs links created to other components from this
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* device. These will appear in the "connections" group.
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* @has_conns_grp: Have added a "connections" group for sysfs links.
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*/
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struct coresight_device {
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struct coresight_platform_data *pdata;
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enum coresight_dev_type type;
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union coresight_dev_subtype subtype;
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const struct coresight_ops *ops;
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struct device dev;
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atomic_t *refcnt;
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bool orphan;
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bool enable; /* true only if configured as part of a path */
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/* sink specific fields */
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bool activated; /* true only if a sink is part of a path */
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struct dev_ext_attribute *ea;
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struct coresight_device *def_sink;
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/* cross trigger handling */
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struct coresight_device *ect_dev;
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/* sysfs links between components */
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int nr_links;
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bool has_conns_grp;
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};
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/*
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* coresight_dev_list - Mapping for devices to "name" index for device
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* names.
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*
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* @nr_idx: Number of entries already allocated.
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* @pfx: Prefix pattern for device name.
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* @fwnode_list: Array of fwnode_handles associated with each allocated
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* index, upto nr_idx entries.
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*/
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struct coresight_dev_list {
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int nr_idx;
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const char *pfx;
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struct fwnode_handle **fwnode_list;
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};
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#define DEFINE_CORESIGHT_DEVLIST(var, dev_pfx) \
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static struct coresight_dev_list (var) = { \
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.pfx = dev_pfx, \
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.nr_idx = 0, \
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.fwnode_list = NULL, \
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}
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#define to_coresight_device(d) container_of(d, struct coresight_device, dev)
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#define source_ops(csdev) csdev->ops->source_ops
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#define sink_ops(csdev) csdev->ops->sink_ops
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#define link_ops(csdev) csdev->ops->link_ops
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#define helper_ops(csdev) csdev->ops->helper_ops
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#define ect_ops(csdev) csdev->ops->ect_ops
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/**
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* struct coresight_ops_sink - basic operations for a sink
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* Operations available for sinks
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* @enable: enables the sink.
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* @disable: disables the sink.
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* @alloc_buffer: initialises perf's ring buffer for trace collection.
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* @free_buffer: release memory allocated in @get_config.
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* @update_buffer: update buffer pointers after a trace session.
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*/
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struct coresight_ops_sink {
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int (*enable)(struct coresight_device *csdev, u32 mode, void *data);
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int (*disable)(struct coresight_device *csdev);
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void *(*alloc_buffer)(struct coresight_device *csdev,
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struct perf_event *event, void **pages,
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int nr_pages, bool overwrite);
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void (*free_buffer)(void *config);
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unsigned long (*update_buffer)(struct coresight_device *csdev,
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struct perf_output_handle *handle,
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void *sink_config);
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};
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/**
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* struct coresight_ops_link - basic operations for a link
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* Operations available for links.
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* @enable: enables flow between iport and oport.
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* @disable: disables flow between iport and oport.
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*/
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struct coresight_ops_link {
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int (*enable)(struct coresight_device *csdev, int iport, int oport);
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void (*disable)(struct coresight_device *csdev, int iport, int oport);
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};
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/**
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* struct coresight_ops_source - basic operations for a source
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* Operations available for sources.
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* @cpu_id: returns the value of the CPU number this component
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* is associated to.
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* @trace_id: returns the value of the component's trace ID as known
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* to the HW.
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* @enable: enables tracing for a source.
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* @disable: disables tracing for a source.
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*/
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struct coresight_ops_source {
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int (*cpu_id)(struct coresight_device *csdev);
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int (*trace_id)(struct coresight_device *csdev);
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int (*enable)(struct coresight_device *csdev,
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struct perf_event *event, u32 mode);
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void (*disable)(struct coresight_device *csdev,
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struct perf_event *event);
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};
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/**
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* struct coresight_ops_helper - Operations for a helper device.
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*
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* All operations could pass in a device specific data, which could
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* help the helper device to determine what to do.
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*
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* @enable : Enable the device
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* @disable : Disable the device
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*/
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struct coresight_ops_helper {
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int (*enable)(struct coresight_device *csdev, void *data);
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int (*disable)(struct coresight_device *csdev, void *data);
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};
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/**
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* struct coresight_ops_ect - Ops for an embedded cross trigger device
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*
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* @enable : Enable the device
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* @disable : Disable the device
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*/
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struct coresight_ops_ect {
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int (*enable)(struct coresight_device *csdev);
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int (*disable)(struct coresight_device *csdev);
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};
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struct coresight_ops {
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const struct coresight_ops_sink *sink_ops;
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const struct coresight_ops_link *link_ops;
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const struct coresight_ops_source *source_ops;
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const struct coresight_ops_helper *helper_ops;
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const struct coresight_ops_ect *ect_ops;
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};
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#ifdef CONFIG_CORESIGHT
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extern struct coresight_device *
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coresight_register(struct coresight_desc *desc);
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extern void coresight_unregister(struct coresight_device *csdev);
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extern int coresight_enable(struct coresight_device *csdev);
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extern void coresight_disable(struct coresight_device *csdev);
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extern int coresight_timeout(void __iomem *addr, u32 offset,
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int position, int value);
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extern int coresight_claim_device(void __iomem *base);
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extern int coresight_claim_device_unlocked(void __iomem *base);
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extern void coresight_disclaim_device(void __iomem *base);
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extern void coresight_disclaim_device_unlocked(void __iomem *base);
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extern char *coresight_alloc_device_name(struct coresight_dev_list *devs,
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struct device *dev);
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extern bool coresight_loses_context_with_cpu(struct device *dev);
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#else
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static inline struct coresight_device *
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coresight_register(struct coresight_desc *desc) { return NULL; }
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static inline void coresight_unregister(struct coresight_device *csdev) {}
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static inline int
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coresight_enable(struct coresight_device *csdev) { return -ENOSYS; }
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static inline void coresight_disable(struct coresight_device *csdev) {}
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static inline int coresight_timeout(void __iomem *addr, u32 offset,
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int position, int value) { return 1; }
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static inline int coresight_claim_device_unlocked(void __iomem *base)
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{
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return -EINVAL;
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}
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static inline int coresight_claim_device(void __iomem *base)
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{
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return -EINVAL;
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}
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static inline void coresight_disclaim_device(void __iomem *base) {}
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static inline void coresight_disclaim_device_unlocked(void __iomem *base) {}
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static inline bool coresight_loses_context_with_cpu(struct device *dev)
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{
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return false;
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}
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#endif
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extern int coresight_get_cpu(struct device *dev);
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struct coresight_platform_data *coresight_get_platform_data(struct device *dev);
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#endif
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