Release 4.7 drivers/hwtracing/intel_th/gth.c

Directory: drivers/hwtracing/intel_th
/*
 * Intel(R) Trace Hub Global Trace Hub
 *
 * Copyright (C) 2014-2015 Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope 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.
 */


#define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt

#include <linux/types.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/io.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/bitmap.h>

#include "intel_th.h"
#include "gth.h"

struct gth_device;

/**
 * struct gth_output - GTH view on an output port
 * @gth:        backlink to the GTH device
 * @output:     link to output device's output descriptor
 * @index:      output port number
 * @port_type:  one of GTH_* port type values
 * @master:     bitmap of masters configured for this output
 */

struct gth_output {
	
struct gth_device	*gth;
	
struct intel_th_output	*output;
	
unsigned int		index;
	
unsigned int		port_type;
	DECLARE_BITMAP(master, TH_CONFIGURABLE_MASTERS + 1);
};

/**
 * struct gth_device - GTH device
 * @dev:        driver core's device
 * @base:       register window base address
 * @output_group:       attributes describing output ports
 * @master_group:       attributes describing master assignments
 * @output:             output ports
 * @master:             master/output port assignments
 * @gth_lock:           serializes accesses to GTH bits
 */

struct gth_device {
	
struct device		*dev;
	
void __iomem		*base;

	
struct attribute_group	output_group;
	
struct attribute_group	master_group;
	
struct gth_output	output[TH_POSSIBLE_OUTPUTS];
	
signed char		master[TH_CONFIGURABLE_MASTERS + 1];
	
spinlock_t		gth_lock;
};



static void gth_output_set(struct gth_device *gth, int port,
			   unsigned int config)
{
	unsigned long reg = port & 4 ? REG_GTH_GTHOPT1 : REG_GTH_GTHOPT0;
	u32 val;
	int shift = (port & 3) * 8;

	val = ioread32(gth->base + reg);
	val &= ~(0xff << shift);
	val |= config << shift;
	iowrite32(val, gth->base + reg);
}

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static unsigned int gth_output_get(struct gth_device *gth, int port)
{
	unsigned long reg = port & 4 ? REG_GTH_GTHOPT1 : REG_GTH_GTHOPT0;
	u32 val;
	int shift = (port & 3) * 8;

	val = ioread32(gth->base + reg);
	val &= 0xff << shift;
	val >>= shift;

	return val;
}

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static void gth_smcfreq_set(struct gth_device *gth, int port,
			    unsigned int freq)
{
	unsigned long reg = REG_GTH_SMCR0 + ((port / 2) * 4);
	int shift = (port & 1) * 16;
	u32 val;

	val = ioread32(gth->base + reg);
	val &= ~(0xffff << shift);
	val |= freq << shift;
	iowrite32(val, gth->base + reg);
}

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static unsigned int gth_smcfreq_get(struct gth_device *gth, int port)
{
	unsigned long reg = REG_GTH_SMCR0 + ((port / 2) * 4);
	int shift = (port & 1) * 16;
	u32 val;

	val = ioread32(gth->base + reg);
	val &= 0xffff << shift;
	val >>= shift;

	return val;
}

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/*
 * "masters" attribute group
 */


struct master_attribute {
	
struct device_attribute	attr;
	
struct gth_device	*gth;
	
unsigned int		master;
};


static void

gth_master_set(struct gth_device *gth, unsigned int master, int port)
{
	unsigned int reg = REG_GTH_SWDEST0 + ((master >> 1) & ~3u);
	unsigned int shift = (master & 0x7) * 4;
	u32 val;

	if (master >= 256) {
		reg = REG_GTH_GSWTDEST;
		shift = 0;
	}

	val = ioread32(gth->base + reg);
	val &= ~(0xf << shift);
	if (port >= 0)
		val |= (0x8 | port) << shift;
	iowrite32(val, gth->base + reg);
}

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static ssize_t master_attr_show(struct device *dev,
				struct device_attribute *attr,
				char *buf)
{
	struct master_attribute *ma =
		container_of(attr, struct master_attribute, attr);
	struct gth_device *gth = ma->gth;
	size_t count;
	int port;

	spin_lock(&gth->gth_lock);
	port = gth->master[ma->master];
	spin_unlock(&gth->gth_lock);

	if (port >= 0)
		count = snprintf(buf, PAGE_SIZE, "%x\n", port);
	else
		count = snprintf(buf, PAGE_SIZE, "disabled\n");

	return count;
}

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static ssize_t master_attr_store(struct device *dev,
				 struct device_attribute *attr,
				 const char *buf, size_t count)
{
	struct master_attribute *ma =
		container_of(attr, struct master_attribute, attr);
	struct gth_device *gth = ma->gth;
	int old_port, port;

	if (kstrtoint(buf, 10, &port) < 0)
		return -EINVAL;

	if (port >= TH_POSSIBLE_OUTPUTS || port < -1)
		return -EINVAL;

	spin_lock(&gth->gth_lock);

	/* disconnect from the previous output port, if any */
	old_port = gth->master[ma->master];
	if (old_port >= 0) {
		gth->master[ma->master] = -1;
		clear_bit(ma->master, gth->output[old_port].master);
		if (gth->output[old_port].output->active)
			gth_master_set(gth, ma->master, -1);
	}

	/* connect to the new output port, if any */
	if (port >= 0) {
		/* check if there's a driver for this port */
		if (!gth->output[port].output) {
			count = -ENODEV;
			goto unlock;
		}

		set_bit(ma->master, gth->output[port].master);

		/* if the port is active, program this setting */
		if (gth->output[port].output->active)
			gth_master_set(gth, ma->master, port);
	}

	gth->master[ma->master] = port;

unlock:
	spin_unlock(&gth->gth_lock);

	return count;
}

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struct output_attribute {
	
struct device_attribute attr;
	
struct gth_device	*gth;
	
unsigned int		port;
	
unsigned int		parm;
};


#define OUTPUT_PARM(_name, _mask, _r, _w, _what)			\
	[TH_OUTPUT_PARM(_name)] = { .name = __stringify(_name),         \
                                    .get = gth_ ## _what ## _get,       \
                                    .set = gth_ ## _what ## _set,       \
                                    .mask = (_mask),                    \
                                    .readable = (_r),                   \
                                    .writable = (_w) }


static const struct output_parm {
	
const char	*name;
	
unsigned int	(*get)(struct gth_device *gth, int port);
	
void		(*set)(struct gth_device *gth, int port,
			       unsigned int val);
	
unsigned int	mask;
	
unsigned int	readable : 1,
			
writable : 1;
} 
output_parms[] = {
	OUTPUT_PARM(port,	0x7,	1, 0, output),
	OUTPUT_PARM(null,	BIT(3),	1, 1, output),
	OUTPUT_PARM(drop,	BIT(4),	1, 1, output),
	OUTPUT_PARM(reset,	BIT(5),	1, 0, output),
	OUTPUT_PARM(flush,	BIT(7),	0, 1, output),
	OUTPUT_PARM(smcfreq,	0xffff,	1, 1, smcfreq),
};


static void

gth_output_parm_set(struct gth_device *gth, int port, unsigned int parm,
		    unsigned int val)
{
	unsigned int config = output_parms[parm].get(gth, port);
	unsigned int mask = output_parms[parm].mask;
	unsigned int shift = __ffs(mask);

	config &= ~mask;
	config |= (val << shift) & mask;
	output_parms[parm].set(gth, port, config);
}

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static unsigned int

gth_output_parm_get(struct gth_device *gth, int port, unsigned int parm)
{
	unsigned int config = output_parms[parm].get(gth, port);
	unsigned int mask = output_parms[parm].mask;
	unsigned int shift = __ffs(mask);

	config &= mask;
	config >>= shift;
	return config;
}

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/*
 * Reset outputs and sources
 */


static int intel_th_gth_reset(struct gth_device *gth)
{
	u32 scratchpad;
	int port, i;

	scratchpad = ioread32(gth->base + REG_GTH_SCRPD0);
	if (scratchpad & SCRPD_DEBUGGER_IN_USE)
		return -EBUSY;

	/* Always save/restore STH and TU registers in S0ix entry/exit */
	scratchpad |= SCRPD_STH_IS_ENABLED | SCRPD_TRIGGER_IS_ENABLED;
	iowrite32(scratchpad, gth->base + REG_GTH_SCRPD0);

	/* output ports */
	for (port = 0; port < 8; port++) {
		if (gth_output_parm_get(gth, port, TH_OUTPUT_PARM(port)) ==
		    GTH_NONE)
			continue;

		gth_output_set(gth, port, 0);
		gth_smcfreq_set(gth, port, 16);
	}
	/* disable overrides */
	iowrite32(0, gth->base + REG_GTH_DESTOVR);

	/* masters swdest_0~31 and gswdest */
	for (i = 0; i < 33; i++)
		iowrite32(0, gth->base + REG_GTH_SWDEST0 + i * 4);

	/* sources */
	iowrite32(0, gth->base + REG_GTH_SCR);
	iowrite32(0xfc, gth->base + REG_GTH_SCR2);

	return 0;
}

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/*
 * "outputs" attribute group
 */



static ssize_t output_attr_show(struct device *dev,
				struct device_attribute *attr,
				char *buf)
{
	struct output_attribute *oa =
		container_of(attr, struct output_attribute, attr);
	struct gth_device *gth = oa->gth;
	size_t count;

	spin_lock(&gth->gth_lock);
	count = snprintf(buf, PAGE_SIZE, "%x\n",
			 gth_output_parm_get(gth, oa->port, oa->parm));
	spin_unlock(&gth->gth_lock);

	return count;
}

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static ssize_t output_attr_store(struct device *dev,
				 struct device_attribute *attr,
				 const char *buf, size_t count)
{
	struct output_attribute *oa =
		container_of(attr, struct output_attribute, attr);
	struct gth_device *gth = oa->gth;
	unsigned int config;

	if (kstrtouint(buf, 16, &config) < 0)
		return -EINVAL;

	spin_lock(&gth->gth_lock);
	gth_output_parm_set(gth, oa->port, oa->parm, config);
	spin_unlock(&gth->gth_lock);

	return count;
}

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static int intel_th_master_attributes(struct gth_device *gth)
{
	struct master_attribute *master_attrs;
	struct attribute **attrs;
	int i, nattrs = TH_CONFIGURABLE_MASTERS + 2;

	attrs = devm_kcalloc(gth->dev, nattrs, sizeof(void *), GFP_KERNEL);
	if (!attrs)
		return -ENOMEM;

	master_attrs = devm_kcalloc(gth->dev, nattrs,
				    sizeof(struct master_attribute),
				    GFP_KERNEL);
	if (!master_attrs)
		return -ENOMEM;

	for (i = 0; i < TH_CONFIGURABLE_MASTERS + 1; i++) {
		char *name;

		name = devm_kasprintf(gth->dev, GFP_KERNEL, "%d%s", i,
				      i == TH_CONFIGURABLE_MASTERS ? "+" : "");
		if (!name)
			return -ENOMEM;

		master_attrs[i].attr.attr.name = name;
		master_attrs[i].attr.attr.mode = S_IRUGO | S_IWUSR;
		master_attrs[i].attr.show = master_attr_show;
		master_attrs[i].attr.store = master_attr_store;

		sysfs_attr_init(&master_attrs[i].attr.attr);
		attrs[i] = &master_attrs[i].attr.attr;

		master_attrs[i].gth = gth;
		master_attrs[i].master = i;
	}

	gth->master_group.name	= "masters";
	gth->master_group.attrs = attrs;

	return sysfs_create_group(&gth->dev->kobj, &gth->master_group);
}

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static int intel_th_output_attributes(struct gth_device *gth)
{
	struct output_attribute *out_attrs;
	struct attribute **attrs;
	int i, j, nouts = TH_POSSIBLE_OUTPUTS;
	int nparms = ARRAY_SIZE(output_parms);
	int nattrs = nouts * nparms + 1;

	attrs = devm_kcalloc(gth->dev, nattrs, sizeof(void *), GFP_KERNEL);
	if (!attrs)
		return -ENOMEM;

	out_attrs = devm_kcalloc(gth->dev, nattrs,
				 sizeof(struct output_attribute),
				 GFP_KERNEL);
	if (!out_attrs)
		return -ENOMEM;

	for (i = 0; i < nouts; i++) {
		for (j = 0; j < nparms; j++) {
			unsigned int idx = i * nparms + j;
			char *name;

			name = devm_kasprintf(gth->dev, GFP_KERNEL, "%d_%s", i,
					      output_parms[j].name);
			if (!name)
				return -ENOMEM;

			out_attrs[idx].attr.attr.name = name;

			if (output_parms[j].readable) {
				out_attrs[idx].attr.attr.mode |= S_IRUGO;
				out_attrs[idx].attr.show = output_attr_show;
			}

			if (output_parms[j].writable) {
				out_attrs[idx].attr.attr.mode |= S_IWUSR;
				out_attrs[idx].attr.store = output_attr_store;
			}

			sysfs_attr_init(&out_attrs[idx].attr.attr);
			attrs[idx] = &out_attrs[idx].attr.attr;

			out_attrs[idx].gth = gth;
			out_attrs[idx].port = i;
			out_attrs[idx].parm = j;
		}
	}

	gth->output_group.name	= "outputs";
	gth->output_group.attrs = attrs;

	return sysfs_create_group(&gth->dev->kobj, &gth->output_group);
}

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/**
 * intel_th_gth_disable() - enable tracing to an output device
 * @thdev:      GTH device
 * @output:     output device's descriptor
 *
 * This will deconfigure all masters set to output to this device,
 * disable tracing using force storeEn off signal and wait for the
 * "pipeline empty" bit for corresponding output port.
 */


static void intel_th_gth_disable(struct intel_th_device *thdev,
				 struct intel_th_output *output)
{
	struct gth_device *gth = dev_get_drvdata(&thdev->dev);
	unsigned long count;
	int master;
	u32 reg;

	spin_lock(&gth->gth_lock);
	output->active = false;

	for_each_set_bit(master, gth->output[output->port].master,
			 TH_CONFIGURABLE_MASTERS) {
		gth_master_set(gth, master, -1);
	}
	spin_unlock(&gth->gth_lock);

	iowrite32(0, gth->base + REG_GTH_SCR);
	iowrite32(0xfd, gth->base + REG_GTH_SCR2);

	/* wait on pipeline empty for the given port */
	for (reg = 0, count = GTH_PLE_WAITLOOP_DEPTH;
	     count && !(reg & BIT(output->port)); count--) {
		reg = ioread32(gth->base + REG_GTH_STAT);
		cpu_relax();
	}

	/* clear force capture done for next captures */
	iowrite32(0xfc, gth->base + REG_GTH_SCR2);

	if (!count)
		dev_dbg(&thdev->dev, "timeout waiting for GTH[%d] PLE\n",
			output->port);

	reg = ioread32(gth->base + REG_GTH_SCRPD0);
	reg &= ~output->scratchpad;
	iowrite32(reg, gth->base + REG_GTH_SCRPD0);
}

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/**
 * intel_th_gth_enable() - enable tracing to an output device
 * @thdev:      GTH device
 * @output:     output device's descriptor
 *
 * This will configure all masters set to output to this device and
 * enable tracing using force storeEn signal.
 */


static void intel_th_gth_enable(struct intel_th_device *thdev,
				struct intel_th_output *output)
{
	struct gth_device *gth = dev_get_drvdata(&thdev->dev);
	u32 scr = 0xfc0000, scrpd;
	int master;

	spin_lock(&gth->gth_lock);
	for_each_set_bit(master, gth->output[output->port].master,
			 TH_CONFIGURABLE_MASTERS + 1) {
		gth_master_set(gth, master, output->port);
	}

	if (output->multiblock)
		scr |= 0xff;

	output->active = true;
	spin_unlock(&gth->gth_lock);

	scrpd = ioread32(gth->base + REG_GTH_SCRPD0);
	scrpd |= output->scratchpad;
	iowrite32(scrpd, gth->base + REG_GTH_SCRPD0);

	iowrite32(scr, gth->base + REG_GTH_SCR);
	iowrite32(0, gth->base + REG_GTH_SCR2);
}

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/**
 * intel_th_gth_assign() - assign output device to a GTH output port
 * @thdev:      GTH device
 * @othdev:     output device
 *
 * This will match a given output device parameters against present
 * output ports on the GTH and fill out relevant bits in output device's
 * descriptor.
 *
 * Return:      0 on success, -errno on error.
 */


static int intel_th_gth_assign(struct intel_th_device *thdev,
			       struct intel_th_device *othdev)
{
	struct gth_device *gth = dev_get_drvdata(&thdev->dev);
	int i, id;

	if (othdev->type != INTEL_TH_OUTPUT)
		return -EINVAL;

	for (i = 0, id = 0; i < TH_POSSIBLE_OUTPUTS; i++) {
		if (gth->output[i].port_type != othdev->output.type)
			continue;

		if (othdev->id == -1 || othdev->id == id)
			goto found;

		id++;
	}

	return -ENOENT;

found:
	spin_lock(&gth->gth_lock);
	othdev->output.port = i;
	othdev->output.active = false;
	gth->output[i].output = &othdev->output;
	spin_unlock(&gth->gth_lock);

	return 0;
}

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/**
 * intel_th_gth_unassign() - deassociate an output device from its output port
 * @thdev:      GTH device
 * @othdev:     output device
 */


static void intel_th_gth_unassign(struct intel_th_device *thdev,
				  struct intel_th_device *othdev)
{
	struct gth_device *gth = dev_get_drvdata(&thdev->dev);
	int port = othdev->output.port;

	spin_lock(&gth->gth_lock);
	othdev->output.port = -1;
	othdev->output.active = false;
	gth->output[port].output = NULL;
	spin_unlock(&gth->gth_lock);
}

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static int

intel_th_gth_set_output(struct intel_th_device *thdev, unsigned int master)
{
	struct gth_device *gth = dev_get_drvdata(&thdev->dev);
	int port = 0; /* FIXME: make default output configurable */

	/*
         * everything above TH_CONFIGURABLE_MASTERS is controlled by the
         * same register
         */
	if (master > TH_CONFIGURABLE_MASTERS)
		master = TH_CONFIGURABLE_MASTERS;

	spin_lock(&gth->gth_lock);
	if (gth->master[master] == -1) {
		set_bit(master, gth->output[port].master);
		gth->master[master] = port;
	}
	spin_unlock(&gth->gth_lock);

	return 0;
}

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static int intel_th_gth_probe(struct intel_th_device *thdev)
{
	struct device *dev = &thdev->dev;
	struct gth_device *gth;
	struct resource *res;
	void __iomem *base;
	int i, ret;

	res = intel_th_device_get_resource(thdev, IORESOURCE_MEM, 0);
	if (!res)
		return -ENODEV;

	base = devm_ioremap(dev, res->start, resource_size(res));
	if (!base)
		return -ENOMEM;

	gth = devm_kzalloc(dev, sizeof(*gth), GFP_KERNEL);
	if (!gth)
		return -ENOMEM;

	gth->dev = dev;
	gth->base = base;
	spin_lock_init(&gth->gth_lock);

	ret = intel_th_gth_reset(gth);
	if (ret)
		return ret;

	for (i = 0; i < TH_CONFIGURABLE_MASTERS + 1; i++)
		gth->master[i] = -1;

	for (i = 0; i < TH_POSSIBLE_OUTPUTS; i++) {
		gth->output[i].gth = gth;
		gth->output[i].index = i;
		gth->output[i].port_type =
			gth_output_parm_get(gth, i, TH_OUTPUT_PARM(port));
	}

	if (intel_th_output_attributes(gth) ||
	    intel_th_master_attributes(gth)) {
		pr_warn("Can't initialize sysfs attributes\n");

		if (gth->output_group.attrs)
			sysfs_remove_group(&gth->dev->kobj, &gth->output_group);
		return -ENOMEM;
	}

	dev_set_drvdata(dev, gth);

	return 0;
}

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static void intel_th_gth_remove(struct intel_th_device *thdev)
{
	struct gth_device *gth = dev_get_drvdata(&thdev->dev);

	sysfs_remove_group(&gth->dev->kobj, &gth->output_group);
	sysfs_remove_group(&gth->dev->kobj, &gth->master_group);
}

Contributors
Person Tokens Prop Commits CommitProp
alexander shishkin alexander shishkin 54 100.00% 1 100.00%
Total 54 100.00% 1 100.00%


static struct intel_th_driver intel_th_gth_driver = {
	.probe		= intel_th_gth_probe,
	.remove		= intel_th_gth_remove,
	.assign		= intel_th_gth_assign,
	.unassign	= intel_th_gth_unassign,
	.set_output	= intel_th_gth_set_output,
	.enable		= intel_th_gth_enable,
	.disable	= intel_th_gth_disable,
	.driver	= {
		.name	= "gth",
		.owner	= THIS_MODULE,
        },
};

module_driver(intel_th_gth_driver,
	      intel_th_driver_register,
	      intel_th_driver_unregister);

MODULE_ALIAS("intel_th_switch");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Intel(R) Trace Hub Global Trace Hub driver");
MODULE_AUTHOR("Alexander Shishkin <alexander.shishkin@linux.intel.com>");
Overall Contributors
Person Tokens Prop Commits CommitProp
alexander shishkin alexander shishkin 3372 99.91% 2 66.67%
dan carpenter dan carpenter 3 0.09% 1 33.33%
Total 3375 100.00% 3 100.00%
  Directory: drivers/hwtracing/intel_th

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
	Person	Tokens	Prop	Commits	CommitProp
alexander shishkin	alexander shishkin	81	100.00%	1	100.00%
	Total	81	100.00%	1	100.00%
cregit-Linux how code gets into the kernel

Release 4.7 drivers/hwtracing/intel_th/gth.c

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