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Date: Wed, 2 Jul 2014 13:06:46 -0600
From: Mathieu Poirier <mathieu.poirier@...aro.org>
To: Daniel Thompson <daniel.thompson@...aro.org>
Cc: Linus Walleij <linus.walleij@...aro.org>,
Will Deacon <will.deacon@....com>,
Russell King - ARM Linux <linux@....linux.org.uk>,
Rob Herring <robherring2@...il.com>,
Arve Hjønnevåg <arve@...roid.com>,
John Stultz <john.stultz@...aro.org>,
Pratik Patel <pratikp@...eaurora.org>,
Vikas Varshney <varshney@...com>, Al Grant <Al.Grant@....com>,
Jonas Svennebring <jonas.svennebring@...gotech.com>,
James King <james.king@...aro.org>,
Panchaxari Prasannamurthy Tumkur
<panchaxari.prasannamurthy@...aro.org>,
Arnd Bergmann <arnd@...aro.org>,
Marcin Jabrzyk <marcin.jabrzyk@...il.com>,
r.sengupta@...sung.com, Robert Marklund <robbelibobban@...il.com>,
Tony Armitstead <Tony.Armitstead@....com>,
Patch Tracking <patches@...aro.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/9 v2] coresight: add CoreSight core layer framework
Thanks for the review - please see my comments inline.
Mathieu
On 2 July 2014 03:38, Daniel Thompson <daniel.thompson@...aro.org> wrote:
> On 27/06/14 19:04, mathieu.poirier@...aro.org wrote:
>> diff --git a/drivers/coresight/Kconfig b/drivers/coresight/Kconfig
>> new file mode 100644
>> index 0000000..fdd4d08
>> --- /dev/null
>> +++ b/drivers/coresight/Kconfig
>> @@ -0,0 +1,10 @@
>> +menuconfig CORESIGHT
>> + bool "CoreSight Tracing Support"
>> + select ARM_AMBA
>> + help
>> + This framework provides an interface for the CoreSight debug and
>> + trace drivers to register themselves with. It's intended to build
>> + up a topological view of the CoreSight components and configure
>> + the right series of components on user input via sysfs. It also
>
> I don't understand this sentence. It makes is sound like user input is
> needed somehow.
That is interesting - I will see if it can be reworked a little.
>
>> diff --git a/drivers/coresight/coresight-priv.h b/drivers/coresight/coresight-priv.h
>> new file mode 100644
>> index 0000000..da1ebbb
>> --- /dev/null
>> +++ b/drivers/coresight/coresight-priv.h
>> @@ -0,0 +1,69 @@
>> +/* Copyright (c) 2011-2012, The Linux Foundation. All rights reserved.
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License version 2 and
>> + * only version 2 as published by the Free Software Foundation.
>> + *
>> + * This program is distributed in the hope that it will be useful,
>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
>> + * GNU General Public License for more details.
>> + */
>> +
>> +#ifndef _CORESIGHT_PRIV_H
>> +#define _CORESIGHT_PRIV_H
>> +
>> +#include <linux/bitops.h>
>> +#include <linux/io.h>
>> +#include <linux/coresight.h>
>> +
>> +/*
>> + * Coresight management registers (0xF00-0xFCC)
>> + * 0xFA0 - 0xFA4: Management registers in PFTv1.0
>> + * Trace registers in PFTv1.1
>> + */
>> +#define CORESIGHT_ITCTRL (0xF00)
>> +#define CORESIGHT_CLAIMSET (0xFA0)
>> +#define CORESIGHT_CLAIMCLR (0xFA4)
>> +#define CORESIGHT_LAR (0xFB0)
>> +#define CORESIGHT_LSR (0xFB4)
>> +#define CORESIGHT_AUTHSTATUS (0xFB8)
>> +#define CORESIGHT_DEVID (0xFC8)
>> +#define CORESIGHT_DEVTYPE (0xFCC)
>> +
>> +#define TIMEOUT_US (100)
>> +
>> +#define BM(lsb, msb) ((BIT(msb) - BIT(lsb)) + BIT(msb))
>
> Isn't this what GENMASK() already does?
You seem to be correct - I'll look further into it and will change if need be.
>
>> +#define BMVAL(val, lsb, msb) ((val & BM(lsb, msb)) >> lsb)
>> +#define BVAL(val, n) ((val & BIT(n)) >> n)
>
> BVAL() is obfuscation and should be removed.
>
> As an example (taken from one of the patches that consumes this macro):
>
> + for (i = TIMEOUT_US;
> + BVAL(cs_readl(drvdata->base, ETB_FFCR), ETB_FFCR_BIT) != 0
> + && i > 0; i--)
> + udelay(1);
>
> Is not really as readable as:
>
> + for (i = TIMEOUT_US;
> + cs_readl(drvdata->base, ETB_FFCR) & ETB_FFCR_BIT && i > 0;
> + i--)
> + udelay(1);
>
> Within the whole patchset it is only every usedIt is only ever used call
> site looks more or less like this:
Re-writing those loops is long overdue - ack.
>
>
>> +#define cs_writel(addr, val, off) __raw_writel((val), addr + off)
>> +#define cs_readl(addr, off) __raw_readl(addr + off)
>
> Out of interest, would readl/writel_relaxed() more appropriate?
Indeed - Linus W. pointed that out for the RFC - I had a patch but it
somehow slipped through.
>
>
>> +
>> +static inline void CS_LOCK(void __iomem *addr)
>> +{
>> + do {
>> + /* wait for things to settle */
>> + mb();
>> + cs_writel(addr, 0x0, CORESIGHT_LAR);
>> + } while (0);
>> +}
>> +
>> +static inline void CS_UNLOCK(void __iomem *addr)
>> +{
>> + do {
>> + cs_writel(addr, CORESIGHT_UNLOCK, CORESIGHT_LAR);
>> + /* make sure eveyone has seen this */
>> + mb();
>> + } while (0);
>> +}
>> +
>> +#ifdef CONFIG_CORESIGHT_SOURCE_ETM
>> +extern unsigned int etm_readl_cp14(u32 off);
>> +extern void etm_writel_cp14(u32 val, u32 off);
>> +#else
>> +static inline unsigned int etm_readl_cp14(u32 off) { return 0; }
>> +static inline void etm_writel_cp14(u32 val, u32 off) {}
>> +#endif
>> +
>> +#endif
>> diff --git a/drivers/coresight/coresight.c b/drivers/coresight/coresight.c
>> new file mode 100644
>> index 0000000..6218d86
>> --- /dev/null
>> +++ b/drivers/coresight/coresight.c
>> @@ -0,0 +1,680 @@
>> +/* Copyright (c) 2012, The Linux Foundation. All rights reserved.
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License version 2 and
>> + * only version 2 as published by the Free Software Foundation.
>> + *
>> + * This program is distributed in the hope that it will be useful,
>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
>> + * GNU General Public License for more details.
>> + */
>> +
>> +#include <linux/kernel.h>
>> +#include <linux/module.h>
>> +#include <linux/init.h>
>> +#include <linux/types.h>
>> +#include <linux/device.h>
>> +#include <linux/io.h>
>> +#include <linux/err.h>
>> +#include <linux/export.h>
>> +#include <linux/slab.h>
>> +#include <linux/semaphore.h>
>> +#include <linux/clk.h>
>> +#include <linux/coresight.h>
>> +#include <linux/of_platform.h>
>> +#include <linux/debugfs.h>
>> +
>> +#include "coresight-priv.h"
>> +
>> +#define NO_SINK (-1)
>> +
>> +struct dentry *cs_debugfs_parent = NULL;
>> +
>> +static int curr_sink = NO_SINK;
>> +static LIST_HEAD(coresight_orph_conns);
>> +static LIST_HEAD(coresight_devs);
>> +static DEFINE_SEMAPHORE(coresight_mutex);
>
> Why is coresight_mutex a semaphore?
Bad naming convention.
>
>
>> +static int coresight_find_link_inport(struct coresight_device *csdev)
>> +{
>> + int i;
>> + struct coresight_device *parent;
>> + struct coresight_connection *conn;
>> +
>> + parent = container_of(csdev->path_link.next, struct coresight_device,
>> + path_link);
>> + for (i = 0; i < parent->nr_conns; i++) {
>> + conn = &parent->conns[i];
>> + if (conn->child_dev == csdev)
>> + return conn->child_port;
>> + }
>> +
>> + pr_err("coresight: couldn't find inport, parent: %d, child: %d\n",
>> + parent->id, csdev->id);
>> + return 0;
>> +}
>> +
>> +static int coresight_find_link_outport(struct coresight_device *csdev)
>> +{
>> + int i;
>> + struct coresight_device *child;
>> + struct coresight_connection *conn;
>> +
>> + child = container_of(csdev->path_link.prev, struct coresight_device,
>> + path_link);
>> + for (i = 0; i < csdev->nr_conns; i++) {
>> + conn = &csdev->conns[i];
>> + if (conn->child_dev == child)
>> + return conn->outport;
>> + }
>> +
>> + pr_err("coresight: couldn't find outport, parent: %d, child: %d\n",
>> + csdev->id, child->id);
>> + return 0;
>> +}
>> +
>> +static int coresight_enable_sink(struct coresight_device *csdev)
>> +{
>> + int ret;
>> +
>> + if (csdev->refcnt.sink_refcnt == 0) {
>> + if (csdev->ops->sink_ops->enable) {
>> + ret = csdev->ops->sink_ops->enable(csdev);
>> + if (ret)
>> + goto err;
>> + csdev->enable = true;
>> + }
>> + }
>> + csdev->refcnt.sink_refcnt++;
>> +
>> + return 0;
>> +err:
>> + return ret;
>> +}
>> +
>> +static void coresight_disable_sink(struct coresight_device *csdev)
>> +{
>> + if (csdev->refcnt.sink_refcnt == 1) {
>> + if (csdev->ops->sink_ops->disable) {
>> + csdev->ops->sink_ops->disable(csdev);
>> + csdev->enable = false;
>> + }
>> + }
>> + csdev->refcnt.sink_refcnt--;
>> +}
>> +
>> +static int coresight_enable_link(struct coresight_device *csdev)
>> +{
>> + int ret;
>> + int link_subtype;
>> + int refport, inport, outport;
>> +
>> + inport = coresight_find_link_inport(csdev);
>> + outport = coresight_find_link_outport(csdev);
>> +
>> + link_subtype = csdev->subtype.link_subtype;
>> + if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_MERG)
>> + refport = inport;
>> + else if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_SPLIT)
>> + refport = outport;
>> + else
>> + refport = 0;
>> +
>> + if (csdev->refcnt.link_refcnts[refport] == 0) {
>> + if (csdev->ops->link_ops->enable) {
>> + ret = csdev->ops->link_ops->enable(csdev, inport,
>> + outport);
>> + if (ret)
>> + goto err;
>> + csdev->enable = true;
>> + }
>> + }
>> + csdev->refcnt.link_refcnts[refport]++;
>> +
>> + return 0;
>> +err:
>> + return ret;
>> +}
>> +
>> +static void coresight_disable_link(struct coresight_device *csdev)
>> +{
>> + int link_subtype;
>> + int refport, inport, outport;
>> +
>> + inport = coresight_find_link_inport(csdev);
>> + outport = coresight_find_link_outport(csdev);
>> +
>> + link_subtype = csdev->subtype.link_subtype;
>> + if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_MERG)
>> + refport = inport;
>> + else if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_SPLIT)
>> + refport = outport;
>> + else
>> + refport = 0;
>
> I already read these 7 lines once...
It is really worth spinning off a function to save 5 lines?
>
>> +
>> + if (csdev->refcnt.link_refcnts[refport] == 1) {
>> + if (csdev->ops->link_ops->disable) {
>> + csdev->ops->link_ops->disable(csdev, inport, outport);
>> + csdev->enable = false;
>> + }
>> + }
>> + csdev->refcnt.link_refcnts[refport]--;
>> +}
>> +
>> +static int coresight_enable_source(struct coresight_device *csdev)
>> +{
>> + int ret;
>> +
>> + if (csdev->refcnt.source_refcnt == 0) {
>> + if (csdev->ops->source_ops->enable) {
>> + ret = csdev->ops->source_ops->enable(csdev);
>> + if (ret)
>> + goto err;
>> + csdev->enable = true;
>> + }
>> + }
>> + csdev->refcnt.source_refcnt++;
>> +
>> + return 0;
>> +err:
>> + return ret;
>> +}
>> +
>> +static void coresight_disable_source(struct coresight_device *csdev)
>> +{
>> + if (csdev->refcnt.source_refcnt == 1) {
>> + if (csdev->ops->source_ops->disable) {
>> + csdev->ops->source_ops->disable(csdev);
>> + csdev->enable = false;
>> + }
>> + }
>> + csdev->refcnt.source_refcnt--;
>> +}
>> +
>> +static struct list_head *coresight_build_path(struct coresight_device *csdev,
>> + struct list_head *path)
>> +{
>> + int i;
>> + struct list_head *p;
>> + struct coresight_connection *conn;
>> +
>> + if (csdev->id == curr_sink) {
>> + list_add_tail(&csdev->path_link, path);
>> + return path;
>> + }
>> +
>> + for (i = 0; i < csdev->nr_conns; i++) {
>> + conn = &csdev->conns[i];
>> + p = coresight_build_path(conn->child_dev, path);
>> + if (p) {
>> + list_add_tail(&csdev->path_link, p);
>> + return p;
>> + }
>> + }
>> + return NULL;
>> +}
>> +
>> +static void coresight_release_path(struct list_head *path)
>> +{
>> + struct coresight_device *cd, *temp;
>> +
>> + list_for_each_entry_safe(cd, temp, path, path_link)
>> + list_del(&cd->path_link);
>> +}
>> +
>> +static int coresight_enable_path(struct list_head *path, bool incl_source)
>> +{
>> + int ret = 0;
>> + struct coresight_device *cd;
>> +
>> + list_for_each_entry(cd, path, path_link) {
>> + if (cd == list_first_entry(path, struct coresight_device,
>> + path_link)) {
>> + ret = coresight_enable_sink(cd);
>> + } else if (list_is_last(&cd->path_link, path)) {
>> + if (incl_source)
>> + ret = coresight_enable_source(cd);
>> + } else {
>> + ret = coresight_enable_link(cd);
>> + }
>> + if (ret)
>> + goto err;
>> + }
>> + return 0;
>> +err:
>> + list_for_each_entry_continue_reverse(cd, path, path_link) {
>> + if (cd == list_first_entry(path, struct coresight_device,
>> + path_link)) {
>> + coresight_disable_sink(cd);
>> + } else if (list_is_last(&cd->path_link, path)) {
>> + if (incl_source)
>> + coresight_disable_source(cd);
>> + } else {
>> + coresight_disable_link(cd);
>> + }
>> + }
>> + return ret;
>> +}
>> +
>> +static void coresight_disable_path(struct list_head *path, bool incl_source)
>> +{
>> + struct coresight_device *cd;
>> +
>> + list_for_each_entry(cd, path, path_link) {
>> + if (cd == list_first_entry(path, struct coresight_device,
>> + path_link)) {
>> + coresight_disable_sink(cd);
>> + } else if (list_is_last(&cd->path_link, path)) {
>> + if (incl_source)
>> + coresight_disable_source(cd);
>> + } else {
>> + coresight_disable_link(cd);
>> + }
>> + }
>> +}
>> +
>> +static int coresight_switch_sink(struct coresight_device *csdev)
>> +{
>> + int ret = 0;
>> + LIST_HEAD(path);
>> + struct coresight_device *cd;
>> +
>> + if (IS_ERR_OR_NULL(csdev))
>> + return -EINVAL;
>
> If we really believe the caller is likely to do something this stupid we
> should probably WARN_ON() for their own good.
ack
>
>
>> +
>> + down(&coresight_mutex);
>> + if (csdev->id == curr_sink)
>> + goto out;
>> +
>> + list_for_each_entry(cd, &coresight_devs, dev_link) {
>> + if (cd->type == CORESIGHT_DEV_TYPE_SOURCE && cd->enable) {
>> + coresight_build_path(cd, &path);
>> + coresight_disable_path(&path, false);
>> + coresight_release_path(&path);
>> + }
>> + }
>> + curr_sink = csdev->id;
>> + list_for_each_entry(cd, &coresight_devs, dev_link) {
>> + if (cd->type == CORESIGHT_DEV_TYPE_SOURCE && cd->enable) {
>> + coresight_build_path(cd, &path);
>> + ret = coresight_enable_path(&path, false);
>> + coresight_release_path(&path);
>> + if (ret)
>> + goto err;
>> + }
>> + }
>> +out:
>> + up(&coresight_mutex);
>> + return 0;
>> +err:
>> + list_for_each_entry(cd, &coresight_devs, dev_link) {
>> + if (cd->type == CORESIGHT_DEV_TYPE_SOURCE && cd->enable)
>> + coresight_disable_source(cd);
>> + }
>> + pr_err("coresight: sink switch failed, sources disabled; try again\n");
>
> coresight_mutex is still locked at this point (so trying again won't
> help ;-).
>
>
>> + return ret;
>> +}
>> +
>> +int coresight_enable(struct coresight_device *csdev)
>> +{
>> + int ret = 0;
>> + LIST_HEAD(path);
>> +
>> + if (IS_ERR_OR_NULL(csdev))
>> + return -EINVAL;
>
> WARN_ON() or remove.
>
>
>> +
>> + down(&coresight_mutex);
>> + if (csdev->type != CORESIGHT_DEV_TYPE_SOURCE) {
>> + ret = -EINVAL;
>> + pr_err("coresight: wrong device type in %s\n", __func__);
>> + goto out;
>> + }
>> + if (csdev->enable)
>> + goto out;
>> +
>> + coresight_build_path(csdev, &path);
>> + ret = coresight_enable_path(&path, true);
>> + coresight_release_path(&path);
>> + if (ret)
>> + pr_err("coresight: enable failed\n");
>> +out:
>> + up(&coresight_mutex);
>> + return ret;
>> +}
>> +EXPORT_SYMBOL_GPL(coresight_enable);
>> +
>> +void coresight_disable(struct coresight_device *csdev)
>> +{
>> + LIST_HEAD(path);
>> +
>> + if (IS_ERR_OR_NULL(csdev))
>> + return;
>> +
>> + down(&coresight_mutex);
>> + if (csdev->type != CORESIGHT_DEV_TYPE_SOURCE) {
>> + pr_err("coresight: wrong device type in %s\n", __func__);
>> + goto out;
>> + }
>> + if (!csdev->enable)
>> + goto out;
>> +
>> + coresight_build_path(csdev, &path);
>> + coresight_disable_path(&path, true);
>> + coresight_release_path(&path);
>> +out:
>> + up(&coresight_mutex);
>> +}
>> +EXPORT_SYMBOL_GPL(coresight_disable);
>> +
>> +void coresight_abort(void)
>> +{
>> + struct coresight_device *cd;
>> +
>> + if (down_trylock(&coresight_mutex)) {
>> + pr_err("coresight: abort could not be processed\n");
>> + return;
>> + }
>> + if (curr_sink == NO_SINK)
>> + goto out;
>> +
>> + list_for_each_entry(cd, &coresight_devs, dev_link) {
>> + if (cd->id == curr_sink) {
>> + if (cd->enable && cd->ops->sink_ops->abort) {
>> + cd->ops->sink_ops->abort(cd);
>> + cd->enable = false;
>> + }
>> + }
>> + }
>> +out:
>> + up(&coresight_mutex);
>> +}
>> +EXPORT_SYMBOL_GPL(coresight_abort);
>> +
>> +static ssize_t debugfs_curr_sink_get(void *data, u64 *val)
>> +{
>> + struct coresight_device *csdev = data;
>> +
>> + *val = (csdev->id == curr_sink) ? 1 : 0;
>> + return 0;
>> +}
>> +
>> +static ssize_t debugfs_curr_sink_set(void *data, u64 val)
>> +{
>> + struct coresight_device *csdev = data;
>> +
>> + if (val)
>> + return coresight_switch_sink(csdev);
>> + else
>> + return -EINVAL;
>> +}
>> +CORESIGHT_DEBUGFS_ENTRY(debugfs_curr_sink, "curr_sink",
>> + S_IRUGO | S_IWUSR, debugfs_curr_sink_get,
>> + debugfs_curr_sink_set, "%llu\n");
>> +
>> +static ssize_t debugfs_enable_get(void *data, u64 *val)
>> +{
>> + struct coresight_device *csdev = data;
>> +
>> + *val = csdev->enable;
>> + return 0;
>> +}
>> +
>> +static ssize_t debugfs_enable_set(void *data, u64 val)
>> +{
>> + struct coresight_device *csdev = data;
>> +
>> + if (val)
>> + return coresight_enable(csdev);
>> + else
>> + coresight_disable(csdev);
>> +
>> + return 0;
>> +}
>> +CORESIGHT_DEBUGFS_ENTRY(debugfs_enable, "enable",
>> + S_IRUGO | S_IWUSR, debugfs_enable_get,
>> + debugfs_enable_set, "%llu\n");
>> +
>> +
>> +static const struct coresight_ops_entry *coresight_grps_sink[] = {
>> + &debugfs_curr_sink_entry,
>> + NULL,
>> +};
>> +
>> +static const struct coresight_ops_entry *coresight_grps_source[] = {
>> + &debugfs_enable_entry,
>> + NULL,
>> +};
>> +
>> +struct coresight_group_entries {
>> + const char *name;
>> + const struct coresight_ops_entry **entries;
>> +};
>> +
>> +struct coresight_group_entries coresight_debugfs_entries[] = {
>> + {
>> + .name = "none",
>> + },
>> + {
>> + .name = "sink",
>> + .entries = coresight_grps_sink,
>> + },
>> + {
>> + .name = "link",
>> + },
>> + {
>> + .name = "linksink",
>> + },
>> + {
>> + .name = "source",
>> + .entries = coresight_grps_source,
>> + },
>> +};
>> +
>> +static void coresight_device_release(struct device *dev)
>> +{
>> + struct coresight_device *csdev = to_coresight_device(dev);
>> + kfree(csdev);
>> +}
>> +
>> +static void coresight_fixup_orphan_conns(struct coresight_device *csdev)
>> +{
>> + struct coresight_connection *conn, *temp;
>> +
>> + list_for_each_entry_safe(conn, temp, &coresight_orph_conns, link) {
>> + if (conn->child_id == csdev->id) {
>> + conn->child_dev = csdev;
>> + list_del(&conn->link);
>> + }
>> + }
>> +}
>> +
>> +static void coresight_fixup_device_conns(struct coresight_device *csdev)
>> +{
>> + int i;
>> + struct coresight_device *cd;
>> + bool found;
>> +
>> + for (i = 0; i < csdev->nr_conns; i++) {
>> + found = false;
>> + list_for_each_entry(cd, &coresight_devs, dev_link) {
>> + if (csdev->conns[i].child_id == cd->id) {
>> + csdev->conns[i].child_dev = cd;
>> + found = true;
>> + break;
>> + }
>> + }
>> + if (!found)
>> + list_add_tail(&csdev->conns[i].link,
>> + &coresight_orph_conns);
>> + }
>> +}
>> +
>> +static int debugfs_coresight_init(void)
>> +{
>> + if (!cs_debugfs_parent) {
>> + cs_debugfs_parent = debugfs_create_dir("coresight", 0);
>> + if (IS_ERR(cs_debugfs_parent))
>> + return -1;
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static struct dentry *coresight_debugfs_desc_init(
>> + struct coresight_device *csdev,
>> + const struct coresight_ops_entry **debugfs_ops)
>> +{
>> + int i = 0;
>> + struct dentry *parent;
>> + struct device *dev = &csdev->dev;
>> + const struct coresight_ops_entry *ops_entry, **ops_entries;
>> +
>> + parent = debugfs_create_dir(dev_name(dev), cs_debugfs_parent);
>> + if (IS_ERR(parent))
>> + return NULL;
>> +
>> + /* device-specific ops */
>> + while (debugfs_ops && debugfs_ops[i]) {
>> + ops_entry = debugfs_ops[i];
>> + if (!debugfs_create_file(ops_entry->name, ops_entry->mode,
>> + parent, dev_get_drvdata(dev->parent),
>> + ops_entry->ops)) {
>> + debugfs_remove_recursive(parent);
>> + return NULL;
>> + }
>> + i++;
>> + }
>> +
>> + /* group-specific ops */
>> + i = 0;
>> + ops_entries = coresight_debugfs_entries[csdev->type].entries;
>> +
>> + while (ops_entries && ops_entries[i]) {
>> + if (!debugfs_create_file(ops_entries[i]->name,
>> + ops_entries[i]->mode,
>> + parent, csdev, ops_entries[i]->ops)) {
>> + debugfs_remove_recursive(parent);
>> + return NULL;
>> + }
>> + i++;
>> + }
>> +
>> + return parent;
>> +}
>> +
>> +struct coresight_device *coresight_register(struct coresight_desc *desc)
>> +{
>> + int i;
>> + int ret;
>> + int link_subtype;
>> + int nr_refcnts;
>> + int *refcnts = NULL;
>> + struct coresight_device *csdev;
>> + struct coresight_connection *conns;
>> +
>> + if (IS_ERR_OR_NULL(desc))
>> + return ERR_PTR(-EINVAL);
>> +
>> + csdev = kzalloc(sizeof(*csdev), GFP_KERNEL);
>> + if (!csdev) {
>> + ret = -ENOMEM;
>> + goto err_kzalloc_csdev;
>> + }
>> +
>> + csdev->id = desc->pdata->id;
>> +
>> + 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_inports;
>> + else if (link_subtype == CORESIGHT_DEV_SUBTYPE_LINK_SPLIT)
>> + nr_refcnts = desc->pdata->nr_outports;
>> + else
>> + nr_refcnts = 1;
>> +
>> + refcnts = kzalloc(sizeof(*refcnts) * nr_refcnts, GFP_KERNEL);
>> + if (!refcnts) {
>> + ret = -ENOMEM;
>> + goto err_kzalloc_refcnts;
>> + }
>> + csdev->refcnt.link_refcnts = refcnts;
>> + }
>> +
>> + csdev->nr_conns = desc->pdata->nr_outports;
>> + conns = kzalloc(sizeof(*conns) * csdev->nr_conns, GFP_KERNEL);
>> + if (!conns) {
>> + ret = -ENOMEM;
>> + goto err_kzalloc_conns;
>> + }
>> +
>> + for (i = 0; i < csdev->nr_conns; i++) {
>> + conns[i].outport = desc->pdata->outports[i];
>> + conns[i].child_id = desc->pdata->child_ids[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->owner = desc->owner;
>> +
>> + csdev->dev.parent = desc->dev;
>> + csdev->dev.release = coresight_device_release;
>> + dev_set_name(&csdev->dev, "%s", desc->pdata->name);
>> +
>> + down(&coresight_mutex);
>> + if (desc->pdata->default_sink) {
>> + if (curr_sink == NO_SINK) {
>> + curr_sink = csdev->id;
>> + } else {
>> + ret = -EINVAL;
>> + goto err_default_sink;
>> + }
>> + }
>> +
>> + coresight_fixup_device_conns(csdev);
>> +
>> + debugfs_coresight_init();
>
> Return value ignored here.
ack
>
>
>> + csdev->de = coresight_debugfs_desc_init(csdev, desc->debugfs_ops);
>> +
>> + coresight_fixup_orphan_conns(csdev);
>> +
>> + list_add_tail(&csdev->dev_link, &coresight_devs);
>> + up(&coresight_mutex);
>> +
>> + return csdev;
>> ...
>
>
>> diff --git a/include/linux/coresight.h b/include/linux/coresight.h
>> new file mode 100644
>> index 0000000..a19420e
>> --- /dev/null
>> +++ b/include/linux/coresight.h
>> @@ -0,0 +1,190 @@
>> +/* Copyright (c) 2012, The Linux Foundation. All rights reserved.
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License version 2 and
>> + * only version 2 as published by the Free Software Foundation.
>> + *
>> + * This program is distributed in the hope that it will be useful,
>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
>> + * GNU General Public License for more details.
>> + */
>> +
>> +#ifndef _LINUX_CORESIGHT_H
>> +#define _LINUX_CORESIGHT_H
>> +
>> +#include <linux/device.h>
>> +
>> +/* Peripheral id registers (0xFD0-0xFEC) */
>> +#define CORESIGHT_PERIPHIDR4 (0xFD0)
>> +#define CORESIGHT_PERIPHIDR5 (0xFD4)
>> +#define CORESIGHT_PERIPHIDR6 (0xFD8)
>> +#define CORESIGHT_PERIPHIDR7 (0xFDC)
>> +#define CORESIGHT_PERIPHIDR0 (0xFE0)
>> +#define CORESIGHT_PERIPHIDR1 (0xFE4)
>> +#define CORESIGHT_PERIPHIDR2 (0xFE8)
>> +#define CORESIGHT_PERIPHIDR3 (0xFEC)
>> +/* Component id registers (0xFF0-0xFFC) */
>> +#define CORESIGHT_COMPIDR0 (0xFF0)
>> +#define CORESIGHT_COMPIDR1 (0xFF4)
>> +#define CORESIGHT_COMPIDR2 (0xFF8)
>> +#define CORESIGHT_COMPIDR3 (0xFFC)
>> +
>> +#define ETM_ARCH_V3_3 (0x23)
>> +#define ETM_ARCH_V3_5 (0x25)
>> +#define PFT_ARCH_V1_1 (0x31)
>> +
>> +#define CORESIGHT_UNLOCK (0xC5ACCE55)
>> +
>> +enum coresight_clk_rate {
>> + CORESIGHT_CLK_RATE_OFF,
>> + CORESIGHT_CLK_RATE_TRACE,
>> + CORESIGHT_CLK_RATE_HSTRACE,
>> +};
>> +
>> +enum coresight_dev_type {
>> + CORESIGHT_DEV_TYPE_NONE,
>> + CORESIGHT_DEV_TYPE_SINK,
>> + CORESIGHT_DEV_TYPE_LINK,
>> + CORESIGHT_DEV_TYPE_LINKSINK,
>> + CORESIGHT_DEV_TYPE_SOURCE,
>> +};
>> +
>> +enum coresight_dev_subtype_sink {
>> + CORESIGHT_DEV_SUBTYPE_SINK_NONE,
>> + CORESIGHT_DEV_SUBTYPE_SINK_PORT,
>> + CORESIGHT_DEV_SUBTYPE_SINK_BUFFER,
>> +};
>> +
>> +enum coresight_dev_subtype_link {
>> + CORESIGHT_DEV_SUBTYPE_LINK_NONE,
>> + CORESIGHT_DEV_SUBTYPE_LINK_MERG,
>> + CORESIGHT_DEV_SUBTYPE_LINK_SPLIT,
>> + CORESIGHT_DEV_SUBTYPE_LINK_FIFO,
>> +};
>> +
>> +enum coresight_dev_subtype_source {
>> + CORESIGHT_DEV_SUBTYPE_SOURCE_NONE,
>> + CORESIGHT_DEV_SUBTYPE_SOURCE_PROC,
>> + CORESIGHT_DEV_SUBTYPE_SOURCE_BUS,
>> + CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE,
>> +};
>> +
>> +struct coresight_ops_entry {
>> + const char *name;
>> + umode_t mode;
>> + const struct file_operations *ops;
>> +};
>> +
>> +struct coresight_dev_subtype {
>> + enum coresight_dev_subtype_sink sink_subtype;
>> + enum coresight_dev_subtype_link link_subtype;
>> + enum coresight_dev_subtype_source source_subtype;
>> +};
>> +
>> +struct coresight_platform_data {
>> + int id;
>> + int cpu;
>> + const char *name;
>> + int nr_inports;
>> + const int *outports;
>> + const int *child_ids;
>> + const int *child_ports;
>> + int nr_outports;
>> + bool default_sink;
>> + struct clk *clk;
>> +};
>> +
>> +struct coresight_desc {
>> + enum coresight_dev_type type;
>> + struct coresight_dev_subtype subtype;
>> + const struct coresight_ops *ops;
>> + struct coresight_platform_data *pdata;
>> + struct device *dev;
>> + const struct coresight_ops_entry **debugfs_ops;
>> + struct module *owner;
>> +};
>> +
>> +struct coresight_connection {
>> + int outport;
>> + int child_id;
>> + int child_port;
>> + struct coresight_device *child_dev;
>> + struct list_head link;
>> +};
>> +
>> +struct coresight_refcnt {
>> + int sink_refcnt;
>> + int *link_refcnts;
>> + int source_refcnt;
>> +};
>> +
>> +struct coresight_device {
>> + int id;
>> + struct coresight_connection *conns;
>> + int nr_conns;
>> + enum coresight_dev_type type;
>> + struct coresight_dev_subtype subtype;
>> + const struct coresight_ops *ops;
>> + struct dentry *de;
>> + struct device dev;
>> + struct coresight_refcnt refcnt;
>> + struct list_head dev_link;
>> + struct list_head path_link;
>> + struct module *owner;
>> + bool enable;
>> +};
>> +
>> +#define to_coresight_device(d) container_of(d, struct coresight_device, dev)
>> +
>> +#define CORESIGHT_DEBUGFS_ENTRY(__name, __entry_name, \
>> + __mode, __get, __set, __fmt) \
>> +DEFINE_SIMPLE_ATTRIBUTE(__name ## _ops, __get, __set, __fmt) \
>> +static const struct coresight_ops_entry __name ## _entry = { \
>> + .name = __entry_name, \
>> + .mode = __mode, \
>> + .ops = &__name ## _ops \
>> +}
>> +
>> +struct coresight_ops_sink {
>> + int (*enable)(struct coresight_device *csdev);
>> + void (*disable)(struct coresight_device *csdev);
>> + void (*abort)(struct coresight_device *csdev);
>> +};
>> +
>> +struct coresight_ops_link {
>> + int (*enable)(struct coresight_device *csdev, int iport, int oport);
>> + void (*disable)(struct coresight_device *csdev, int iport, int oport);
>> +};
>> +
>> +struct coresight_ops_source {
>> + int (*enable)(struct coresight_device *csdev);
>> + void (*disable)(struct coresight_device *csdev);
>> +};
>> +
>> +struct coresight_ops {
>> + const struct coresight_ops_sink *sink_ops;
>> + const struct coresight_ops_link *link_ops;
>> + const struct coresight_ops_source *source_ops;
>> +};
>> +
>> +#ifdef CONFIG_CORESIGHT
>> +extern struct coresight_device *
>> +coresight_register(struct coresight_desc *desc);
>> +extern void coresight_unregister(struct coresight_device *csdev);
>> +extern int coresight_enable(struct coresight_device *csdev);
>> +extern void coresight_disable(struct coresight_device *csdev);
>> +extern void coresight_abort(void);
>> +extern struct clk *coresight_get_clk(void);
>> +#else
>> +static inline struct coresight_device *
>> +coresight_register(struct coresight_desc *desc) { return NULL; }
>> +static inline void coresight_unregister(struct coresight_device *csdev) {}
>> +static inline int
>> +coresight_enable(struct coresight_device *csdev) { return -ENOSYS; }
>> +static inline void coresight_disable(struct coresight_device *csdev) {}
>> +static inline void coresight_abort(void) {}
>> +extern struct clk *coresight_get_clk(void) {};
> ^^^^^^ ^^
>
> Not static and no return value.
That is cruft from a past era and should have been removed.
>
>> +#endif
>> +
>> +#endif
>
--
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