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![Mathieu Poirier](/assets/img/avatar_default.png)
Keeping drivers related to HW tracing on ARM, i.e coresight, under "drivers/coresight" doesn't make sense when other architectures start rolling out technologies of the same nature. As such creating a new "drivers/hwtracing" directory where all drivers of the same kind can reside, reducing namespace pollution under "drivers/". Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
720 lines
16 KiB
C
720 lines
16 KiB
C
/* Copyright (c) 2012, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/device.h>
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#include <linux/io.h>
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#include <linux/err.h>
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#include <linux/export.h>
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#include <linux/slab.h>
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#include <linux/mutex.h>
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#include <linux/clk.h>
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#include <linux/coresight.h>
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#include <linux/of_platform.h>
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#include <linux/delay.h>
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#include "coresight-priv.h"
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static DEFINE_MUTEX(coresight_mutex);
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static int coresight_id_match(struct device *dev, void *data)
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{
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int trace_id, i_trace_id;
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struct coresight_device *csdev, *i_csdev;
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csdev = data;
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i_csdev = to_coresight_device(dev);
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/*
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* No need to care about oneself and components that are not
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* sources or not enabled
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*/
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if (i_csdev == csdev || !i_csdev->enable ||
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i_csdev->type != CORESIGHT_DEV_TYPE_SOURCE)
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return 0;
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/* Get the source ID for both compoment */
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trace_id = source_ops(csdev)->trace_id(csdev);
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i_trace_id = source_ops(i_csdev)->trace_id(i_csdev);
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/* All you need is one */
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if (trace_id == i_trace_id)
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return 1;
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return 0;
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}
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static int coresight_source_is_unique(struct coresight_device *csdev)
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{
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int trace_id = source_ops(csdev)->trace_id(csdev);
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/* this shouldn't happen */
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if (trace_id < 0)
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return 0;
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return !bus_for_each_dev(&coresight_bustype, NULL,
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csdev, coresight_id_match);
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}
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static int coresight_find_link_inport(struct coresight_device *csdev)
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{
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int i;
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struct coresight_device *parent;
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struct coresight_connection *conn;
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parent = container_of(csdev->path_link.next,
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struct coresight_device, path_link);
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for (i = 0; i < parent->nr_outport; i++) {
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conn = &parent->conns[i];
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if (conn->child_dev == csdev)
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return conn->child_port;
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}
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dev_err(&csdev->dev, "couldn't find inport, parent: %s, child: %s\n",
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dev_name(&parent->dev), dev_name(&csdev->dev));
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return 0;
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}
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static int coresight_find_link_outport(struct coresight_device *csdev)
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{
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int i;
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struct coresight_device *child;
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struct coresight_connection *conn;
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child = container_of(csdev->path_link.prev,
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struct coresight_device, path_link);
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for (i = 0; i < csdev->nr_outport; i++) {
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conn = &csdev->conns[i];
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if (conn->child_dev == child)
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return conn->outport;
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}
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dev_err(&csdev->dev, "couldn't find outport, parent: %s, child: %s\n",
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dev_name(&csdev->dev), dev_name(&child->dev));
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return 0;
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}
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static int coresight_enable_sink(struct coresight_device *csdev)
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{
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int ret;
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if (!csdev->enable) {
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if (sink_ops(csdev)->enable) {
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ret = sink_ops(csdev)->enable(csdev);
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if (ret)
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return ret;
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}
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csdev->enable = true;
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}
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atomic_inc(csdev->refcnt);
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return 0;
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}
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static void coresight_disable_sink(struct coresight_device *csdev)
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{
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if (atomic_dec_return(csdev->refcnt) == 0) {
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if (sink_ops(csdev)->disable) {
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sink_ops(csdev)->disable(csdev);
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csdev->enable = false;
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}
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}
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}
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static int coresight_enable_link(struct coresight_device *csdev)
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{
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int ret;
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int link_subtype;
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int refport, inport, outport;
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inport = coresight_find_link_inport(csdev);
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outport = coresight_find_link_outport(csdev);
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link_subtype = csdev->subtype.link_subtype;
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if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_MERG)
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refport = inport;
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else if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_SPLIT)
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refport = outport;
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else
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refport = 0;
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if (atomic_inc_return(&csdev->refcnt[refport]) == 1) {
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if (link_ops(csdev)->enable) {
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ret = link_ops(csdev)->enable(csdev, inport, outport);
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if (ret)
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return ret;
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}
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}
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csdev->enable = true;
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return 0;
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}
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static void coresight_disable_link(struct coresight_device *csdev)
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{
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int i, nr_conns;
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int link_subtype;
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int refport, inport, outport;
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inport = coresight_find_link_inport(csdev);
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outport = coresight_find_link_outport(csdev);
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link_subtype = csdev->subtype.link_subtype;
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if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_MERG) {
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refport = inport;
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nr_conns = csdev->nr_inport;
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} else if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_SPLIT) {
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refport = outport;
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nr_conns = csdev->nr_outport;
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} else {
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refport = 0;
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nr_conns = 1;
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}
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if (atomic_dec_return(&csdev->refcnt[refport]) == 0) {
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if (link_ops(csdev)->disable)
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link_ops(csdev)->disable(csdev, inport, outport);
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}
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for (i = 0; i < nr_conns; i++)
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if (atomic_read(&csdev->refcnt[i]) != 0)
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return;
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csdev->enable = false;
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}
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static int coresight_enable_source(struct coresight_device *csdev)
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{
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int ret;
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if (!coresight_source_is_unique(csdev)) {
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dev_warn(&csdev->dev, "traceID %d not unique\n",
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source_ops(csdev)->trace_id(csdev));
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return -EINVAL;
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}
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if (!csdev->enable) {
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if (source_ops(csdev)->enable) {
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ret = source_ops(csdev)->enable(csdev);
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if (ret)
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return ret;
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}
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csdev->enable = true;
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}
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atomic_inc(csdev->refcnt);
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return 0;
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}
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static void coresight_disable_source(struct coresight_device *csdev)
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{
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if (atomic_dec_return(csdev->refcnt) == 0) {
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if (source_ops(csdev)->disable) {
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source_ops(csdev)->disable(csdev);
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csdev->enable = false;
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}
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}
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}
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static int coresight_enable_path(struct list_head *path)
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{
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int ret = 0;
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struct coresight_device *cd;
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list_for_each_entry(cd, path, path_link) {
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if (cd == list_first_entry(path, struct coresight_device,
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path_link)) {
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ret = coresight_enable_sink(cd);
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} else if (list_is_last(&cd->path_link, path)) {
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/*
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* Don't enable the source just yet - this needs to
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* happen at the very end when all links and sink
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* along the path have been configured properly.
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*/
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;
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} else {
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ret = coresight_enable_link(cd);
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}
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if (ret)
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goto err;
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}
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return 0;
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err:
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list_for_each_entry_continue_reverse(cd, path, path_link) {
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if (cd == list_first_entry(path, struct coresight_device,
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path_link)) {
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coresight_disable_sink(cd);
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} else if (list_is_last(&cd->path_link, path)) {
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;
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} else {
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coresight_disable_link(cd);
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}
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}
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return ret;
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}
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static int coresight_disable_path(struct list_head *path)
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{
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struct coresight_device *cd;
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list_for_each_entry_reverse(cd, path, path_link) {
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if (cd == list_first_entry(path, struct coresight_device,
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path_link)) {
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coresight_disable_sink(cd);
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} else if (list_is_last(&cd->path_link, path)) {
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/*
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* The source has already been stopped, no need
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* to do it again here.
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*/
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;
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} else {
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coresight_disable_link(cd);
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}
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}
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return 0;
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}
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static int coresight_build_paths(struct coresight_device *csdev,
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struct list_head *path,
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bool enable)
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{
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int i, ret = -EINVAL;
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struct coresight_connection *conn;
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list_add(&csdev->path_link, path);
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if ((csdev->type == CORESIGHT_DEV_TYPE_SINK ||
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csdev->type == CORESIGHT_DEV_TYPE_LINKSINK) &&
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csdev->activated) {
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if (enable)
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ret = coresight_enable_path(path);
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else
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ret = coresight_disable_path(path);
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} else {
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for (i = 0; i < csdev->nr_outport; i++) {
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conn = &csdev->conns[i];
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if (coresight_build_paths(conn->child_dev,
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path, enable) == 0)
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ret = 0;
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}
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}
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if (list_first_entry(path, struct coresight_device, path_link) != csdev)
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dev_err(&csdev->dev, "wrong device in %s\n", __func__);
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list_del(&csdev->path_link);
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return ret;
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}
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int coresight_enable(struct coresight_device *csdev)
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{
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int ret = 0;
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LIST_HEAD(path);
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mutex_lock(&coresight_mutex);
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if (csdev->type != CORESIGHT_DEV_TYPE_SOURCE) {
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ret = -EINVAL;
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dev_err(&csdev->dev, "wrong device type in %s\n", __func__);
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goto out;
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}
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if (csdev->enable)
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goto out;
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if (coresight_build_paths(csdev, &path, true)) {
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dev_err(&csdev->dev, "building path(s) failed\n");
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goto out;
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}
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if (coresight_enable_source(csdev))
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dev_err(&csdev->dev, "source enable failed\n");
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out:
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mutex_unlock(&coresight_mutex);
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return ret;
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}
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EXPORT_SYMBOL_GPL(coresight_enable);
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void coresight_disable(struct coresight_device *csdev)
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{
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LIST_HEAD(path);
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mutex_lock(&coresight_mutex);
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if (csdev->type != CORESIGHT_DEV_TYPE_SOURCE) {
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dev_err(&csdev->dev, "wrong device type in %s\n", __func__);
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goto out;
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}
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if (!csdev->enable)
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goto out;
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coresight_disable_source(csdev);
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if (coresight_build_paths(csdev, &path, false))
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dev_err(&csdev->dev, "releasing path(s) failed\n");
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out:
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mutex_unlock(&coresight_mutex);
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}
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EXPORT_SYMBOL_GPL(coresight_disable);
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static ssize_t enable_sink_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct coresight_device *csdev = to_coresight_device(dev);
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return scnprintf(buf, PAGE_SIZE, "%u\n", (unsigned)csdev->activated);
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}
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static ssize_t enable_sink_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t size)
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{
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int ret;
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unsigned long val;
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struct coresight_device *csdev = to_coresight_device(dev);
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ret = kstrtoul(buf, 10, &val);
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if (ret)
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return ret;
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if (val)
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csdev->activated = true;
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else
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csdev->activated = false;
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return size;
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}
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static DEVICE_ATTR_RW(enable_sink);
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static ssize_t enable_source_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct coresight_device *csdev = to_coresight_device(dev);
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return scnprintf(buf, PAGE_SIZE, "%u\n", (unsigned)csdev->enable);
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}
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static ssize_t enable_source_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t size)
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{
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int ret = 0;
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unsigned long val;
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struct coresight_device *csdev = to_coresight_device(dev);
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ret = kstrtoul(buf, 10, &val);
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if (ret)
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return ret;
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if (val) {
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ret = coresight_enable(csdev);
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if (ret)
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return ret;
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} else {
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coresight_disable(csdev);
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}
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return size;
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}
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static DEVICE_ATTR_RW(enable_source);
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static struct attribute *coresight_sink_attrs[] = {
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&dev_attr_enable_sink.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(coresight_sink);
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static struct attribute *coresight_source_attrs[] = {
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&dev_attr_enable_source.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(coresight_source);
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static struct device_type coresight_dev_type[] = {
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{
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.name = "none",
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},
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{
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.name = "sink",
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.groups = coresight_sink_groups,
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},
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{
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.name = "link",
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},
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{
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.name = "linksink",
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.groups = coresight_sink_groups,
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},
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{
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.name = "source",
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.groups = coresight_source_groups,
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},
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};
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static void coresight_device_release(struct device *dev)
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{
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struct coresight_device *csdev = to_coresight_device(dev);
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kfree(csdev);
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}
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static int coresight_orphan_match(struct device *dev, void *data)
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{
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int i;
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bool still_orphan = false;
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struct coresight_device *csdev, *i_csdev;
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struct coresight_connection *conn;
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csdev = data;
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i_csdev = to_coresight_device(dev);
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/* No need to check oneself */
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if (csdev == i_csdev)
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return 0;
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/* Move on to another component if no connection is orphan */
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if (!i_csdev->orphan)
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return 0;
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/*
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* Circle throuch all the connection of that component. If we find
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* an orphan connection whose name matches @csdev, link it.
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*/
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for (i = 0; i < i_csdev->nr_outport; i++) {
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conn = &i_csdev->conns[i];
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/* We have found at least one orphan connection */
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if (conn->child_dev == NULL) {
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/* Does it match this newly added device? */
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if (!strcmp(dev_name(&csdev->dev), conn->child_name)) {
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conn->child_dev = csdev;
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} else {
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/* This component still has an orphan */
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still_orphan = true;
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}
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}
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}
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i_csdev->orphan = still_orphan;
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/*
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* Returning '0' ensures that all known component on the
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* bus will be checked.
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*/
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return 0;
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}
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static void coresight_fixup_orphan_conns(struct coresight_device *csdev)
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{
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/*
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* No need to check for a return value as orphan connection(s)
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* are hooked-up with each newly added component.
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*/
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bus_for_each_dev(&coresight_bustype, NULL,
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csdev, coresight_orphan_match);
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}
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static int coresight_name_match(struct device *dev, void *data)
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{
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char *to_match;
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struct coresight_device *i_csdev;
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to_match = data;
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i_csdev = to_coresight_device(dev);
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if (!strcmp(to_match, dev_name(&i_csdev->dev)))
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|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void coresight_fixup_device_conns(struct coresight_device *csdev)
|
|
{
|
|
int i;
|
|
struct device *dev = NULL;
|
|
struct coresight_connection *conn;
|
|
|
|
for (i = 0; i < csdev->nr_outport; i++) {
|
|
conn = &csdev->conns[i];
|
|
dev = bus_find_device(&coresight_bustype, NULL,
|
|
(void *)conn->child_name,
|
|
coresight_name_match);
|
|
|
|
if (dev) {
|
|
conn->child_dev = to_coresight_device(dev);
|
|
} else {
|
|
csdev->orphan = true;
|
|
conn->child_dev = NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* coresight_timeout - loop until a bit has changed to a specific state.
|
|
* @addr: base address of the area of interest.
|
|
* @offset: address of a register, starting from @addr.
|
|
* @position: the position of the bit of interest.
|
|
* @value: the value the bit should have.
|
|
*
|
|
* Return: 0 as soon as the bit has taken the desired state or -EAGAIN if
|
|
* TIMEOUT_US has elapsed, which ever happens first.
|
|
*/
|
|
|
|
int coresight_timeout(void __iomem *addr, u32 offset, int position, int value)
|
|
{
|
|
int i;
|
|
u32 val;
|
|
|
|
for (i = TIMEOUT_US; i > 0; i--) {
|
|
val = __raw_readl(addr + offset);
|
|
/* waiting on the bit to go from 0 to 1 */
|
|
if (value) {
|
|
if (val & BIT(position))
|
|
return 0;
|
|
/* waiting on the bit to go from 1 to 0 */
|
|
} else {
|
|
if (!(val & BIT(position)))
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Delay is arbitrary - the specification doesn't say how long
|
|
* we are expected to wait. Extra check required to make sure
|
|
* we don't wait needlessly on the last iteration.
|
|
*/
|
|
if (i - 1)
|
|
udelay(1);
|
|
}
|
|
|
|
return -EAGAIN;
|
|
}
|
|
|
|
struct bus_type coresight_bustype = {
|
|
.name = "coresight",
|
|
};
|
|
|
|
static int __init coresight_init(void)
|
|
{
|
|
return bus_register(&coresight_bustype);
|
|
}
|
|
postcore_initcall(coresight_init);
|
|
|
|
struct coresight_device *coresight_register(struct coresight_desc *desc)
|
|
{
|
|
int i;
|
|
int ret;
|
|
int link_subtype;
|
|
int nr_refcnts = 1;
|
|
atomic_t *refcnts = NULL;
|
|
struct coresight_device *csdev;
|
|
struct coresight_connection *conns;
|
|
|
|
csdev = kzalloc(sizeof(*csdev), GFP_KERNEL);
|
|
if (!csdev) {
|
|
ret = -ENOMEM;
|
|
goto err_kzalloc_csdev;
|
|
}
|
|
|
|
if (desc->type == CORESIGHT_DEV_TYPE_LINK ||
|
|
desc->type == CORESIGHT_DEV_TYPE_LINKSINK) {
|
|
link_subtype = desc->subtype.link_subtype;
|
|
|
|
if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_MERG)
|
|
nr_refcnts = desc->pdata->nr_inport;
|
|
else if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_SPLIT)
|
|
nr_refcnts = desc->pdata->nr_outport;
|
|
}
|
|
|
|
refcnts = kcalloc(nr_refcnts, sizeof(*refcnts), GFP_KERNEL);
|
|
if (!refcnts) {
|
|
ret = -ENOMEM;
|
|
goto err_kzalloc_refcnts;
|
|
}
|
|
|
|
csdev->refcnt = refcnts;
|
|
|
|
csdev->nr_inport = desc->pdata->nr_inport;
|
|
csdev->nr_outport = desc->pdata->nr_outport;
|
|
conns = kcalloc(csdev->nr_outport, sizeof(*conns), GFP_KERNEL);
|
|
if (!conns) {
|
|
ret = -ENOMEM;
|
|
goto err_kzalloc_conns;
|
|
}
|
|
|
|
for (i = 0; i < csdev->nr_outport; i++) {
|
|
conns[i].outport = desc->pdata->outports[i];
|
|
conns[i].child_name = desc->pdata->child_names[i];
|
|
conns[i].child_port = desc->pdata->child_ports[i];
|
|
}
|
|
|
|
csdev->conns = conns;
|
|
|
|
csdev->type = desc->type;
|
|
csdev->subtype = desc->subtype;
|
|
csdev->ops = desc->ops;
|
|
csdev->orphan = false;
|
|
|
|
csdev->dev.type = &coresight_dev_type[desc->type];
|
|
csdev->dev.groups = desc->groups;
|
|
csdev->dev.parent = desc->dev;
|
|
csdev->dev.release = coresight_device_release;
|
|
csdev->dev.bus = &coresight_bustype;
|
|
dev_set_name(&csdev->dev, "%s", desc->pdata->name);
|
|
|
|
ret = device_register(&csdev->dev);
|
|
if (ret)
|
|
goto err_device_register;
|
|
|
|
mutex_lock(&coresight_mutex);
|
|
|
|
coresight_fixup_device_conns(csdev);
|
|
coresight_fixup_orphan_conns(csdev);
|
|
|
|
mutex_unlock(&coresight_mutex);
|
|
|
|
return csdev;
|
|
|
|
err_device_register:
|
|
kfree(conns);
|
|
err_kzalloc_conns:
|
|
kfree(refcnts);
|
|
err_kzalloc_refcnts:
|
|
kfree(csdev);
|
|
err_kzalloc_csdev:
|
|
return ERR_PTR(ret);
|
|
}
|
|
EXPORT_SYMBOL_GPL(coresight_register);
|
|
|
|
void coresight_unregister(struct coresight_device *csdev)
|
|
{
|
|
mutex_lock(&coresight_mutex);
|
|
|
|
kfree(csdev->conns);
|
|
device_unregister(&csdev->dev);
|
|
|
|
mutex_unlock(&coresight_mutex);
|
|
}
|
|
EXPORT_SYMBOL_GPL(coresight_unregister);
|
|
|
|
MODULE_LICENSE("GPL v2");
|