ARM: 5841/1: a driver for on-chip ETM and ETB

This driver implements support for on-chip Embedded Tracing Macrocell and
Embedded Trace Buffer. It allows to trigger tracing of kernel execution flow
and exporting trace output to userspace via character device and a sysrq
combo.

Trace output can then be decoded by a fairly simple open source tool [1]
which is already sufficient to get the idea of what the kernel is doing.

[1]: http://github.com/virtuoso/etm2human

Signed-off-by: Alexander Shishkin <virtuoso@slind.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

2 files changed, 643 insertions, 0 deletions

diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile
index 79087dd..e7ccf7e 100644
--- a/arch/arm/kernel/Makefile
+++ b/arch/arm/kernel/Makefile
@@ -17,6 +17,8 @@ obj-y		:= compat.o elf.o entry-armv.o entry-common.o irq.o \
 		   process.o ptrace.o return_address.o setup.o signal.o \
 		   sys_arm.o stacktrace.o time.o traps.o
 
+obj-$(CONFIG_OC_ETM)		+= etm.o
+
 obj-$(CONFIG_ISA_DMA_API)	+= dma.o
 obj-$(CONFIG_ARCH_ACORN)	+= ecard.o 
 obj-$(CONFIG_FIQ)		+= fiq.o
diff --git a/arch/arm/kernel/etm.c b/arch/arm/kernel/etm.c
new file mode 100644
index 0000000..8277539
--- /dev/null
+++ b/arch/arm/kernel/etm.c
@@ -0,0 +1,641 @@
+/*
+ * linux/arch/arm/kernel/etm.c
+ *
+ * Driver for ARM's Embedded Trace Macrocell and Embedded Trace Buffer.
+ *
+ * Copyright (C) 2009 Nokia Corporation.
+ * Alexander Shishkin
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/io.h>
+#include <linux/sysrq.h>
+#include <linux/device.h>
+#include <linux/clk.h>
+#include <linux/amba/bus.h>
+#include <linux/fs.h>
+#include <linux/uaccess.h>
+#include <linux/miscdevice.h>
+#include <linux/vmalloc.h>
+#include <linux/mutex.h>
+#include <asm/hardware/coresight.h>
+#include <asm/sections.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Alexander Shishkin");
+
+static struct tracectx tracer;
+
+static inline bool trace_isrunning(struct tracectx *t)
+{
+	return !!(t->flags & TRACER_RUNNING);
+}
+
+static int etm_setup_address_range(struct tracectx *t, int n,
+		unsigned long start, unsigned long end, int exclude, int data)
+{
+	u32 flags = ETMAAT_ARM | ETMAAT_IGNCONTEXTID | ETMAAT_NSONLY | \
+		    ETMAAT_NOVALCMP;
+
+	if (n < 1 || n > t->ncmppairs)
+		return -EINVAL;
+
+	/* comparators and ranges are numbered starting with 1 as opposed
+	 * to bits in a word */
+	n--;
+
+	if (data)
+		flags |= ETMAAT_DLOADSTORE;
+	else
+		flags |= ETMAAT_IEXEC;
+
+	/* first comparator for the range */
+	etm_writel(t, flags, ETMR_COMP_ACC_TYPE(n * 2));
+	etm_writel(t, start, ETMR_COMP_VAL(n * 2));
+
+	/* second comparator is right next to it */
+	etm_writel(t, flags, ETMR_COMP_ACC_TYPE(n * 2 + 1));
+	etm_writel(t, end, ETMR_COMP_VAL(n * 2 + 1));
+
+	flags = exclude ? ETMTE_INCLEXCL : 0;
+	etm_writel(t, flags | (1 << n), ETMR_TRACEENCTRL);
+
+	return 0;
+}
+
+static int trace_start(struct tracectx *t)
+{
+	u32 v;
+	unsigned long timeout = TRACER_TIMEOUT;
+
+	etb_unlock(t);
+
+	etb_writel(t, 0, ETBR_FORMATTERCTRL);
+	etb_writel(t, 1, ETBR_CTRL);
+
+	etb_lock(t);
+
+	/* configure etm */
+	v = ETMCTRL_OPTS | ETMCTRL_PROGRAM | ETMCTRL_PORTSIZE(t->etm_portsz);
+
+	if (t->flags & TRACER_CYCLE_ACC)
+		v |= ETMCTRL_CYCLEACCURATE;
+
+	etm_unlock(t);
+
+	etm_writel(t, v, ETMR_CTRL);
+
+	while (!(etm_readl(t, ETMR_CTRL) & ETMCTRL_PROGRAM) && --timeout)
+		;
+	if (!timeout) {
+		dev_dbg(t->dev, "Waiting for progbit to assert timed out\n");
+		etm_lock(t);
+		return -EFAULT;
+	}
+
+	etm_setup_address_range(t, 1, (unsigned long)_stext,
+			(unsigned long)_etext, 0, 0);
+	etm_writel(t, 0, ETMR_TRACEENCTRL2);
+	etm_writel(t, 0, ETMR_TRACESSCTRL);
+	etm_writel(t, 0x6f, ETMR_TRACEENEVT);
+
+	v &= ~ETMCTRL_PROGRAM;
+	v |= ETMCTRL_PORTSEL;
+
+	etm_writel(t, v, ETMR_CTRL);
+
+	timeout = TRACER_TIMEOUT;
+	while (etm_readl(t, ETMR_CTRL) & ETMCTRL_PROGRAM && --timeout)
+		;
+	if (!timeout) {
+		dev_dbg(t->dev, "Waiting for progbit to deassert timed out\n");
+		etm_lock(t);
+		return -EFAULT;
+	}
+
+	etm_lock(t);
+
+	t->flags |= TRACER_RUNNING;
+
+	return 0;
+}
+
+static int trace_stop(struct tracectx *t)
+{
+	unsigned long timeout = TRACER_TIMEOUT;
+
+	etm_unlock(t);
+
+	etm_writel(t, 0x440, ETMR_CTRL);
+	while (!(etm_readl(t, ETMR_CTRL) & ETMCTRL_PROGRAM) && --timeout)
+		;
+	if (!timeout) {
+		dev_dbg(t->dev, "Waiting for progbit to assert timed out\n");
+		etm_lock(t);
+		return -EFAULT;
+	}
+
+	etm_lock(t);
+
+	etb_unlock(t);
+	etb_writel(t, ETBFF_MANUAL_FLUSH, ETBR_FORMATTERCTRL);
+
+	timeout = TRACER_TIMEOUT;
+	while (etb_readl(t, ETBR_FORMATTERCTRL) &
+			ETBFF_MANUAL_FLUSH && --timeout)
+		;
+	if (!timeout) {
+		dev_dbg(t->dev, "Waiting for formatter flush to commence "
+				"timed out\n");
+		etb_lock(t);
+		return -EFAULT;
+	}
+
+	etb_writel(t, 0, ETBR_CTRL);
+
+	etb_lock(t);
+
+	t->flags &= ~TRACER_RUNNING;
+
+	return 0;
+}
+
+static int etb_getdatalen(struct tracectx *t)
+{
+	u32 v;
+	int rp, wp;
+
+	v = etb_readl(t, ETBR_STATUS);
+
+	if (v & 1)
+		return t->etb_bufsz;
+
+	rp = etb_readl(t, ETBR_READADDR);
+	wp = etb_readl(t, ETBR_WRITEADDR);
+
+	if (rp > wp) {
+		etb_writel(t, 0, ETBR_READADDR);
+		etb_writel(t, 0, ETBR_WRITEADDR);
+
+		return 0;
+	}
+
+	return wp - rp;
+}
+
+/* sysrq+v will always stop the running trace and leave it at that */
+static void etm_dump(void)
+{
+	struct tracectx *t = &tracer;
+	u32 first = 0;
+	int length;
+
+	if (!t->etb_regs) {
+		printk(KERN_INFO "No tracing hardware found\n");
+		return;
+	}
+
+	if (trace_isrunning(t))
+		trace_stop(t);
+
+	etb_unlock(t);
+
+	length = etb_getdatalen(t);
+
+	if (length == t->etb_bufsz)
+		first = etb_readl(t, ETBR_WRITEADDR);
+
+	etb_writel(t, first, ETBR_READADDR);
+
+	printk(KERN_INFO "Trace buffer contents length: %d\n", length);
+	printk(KERN_INFO "--- ETB buffer begin ---\n");
+	for (; length; length--)
+		printk("%08x", cpu_to_be32(etb_readl(t, ETBR_READMEM)));
+	printk(KERN_INFO "\n--- ETB buffer end ---\n");
+
+	/* deassert the overflow bit */
+	etb_writel(t, 1, ETBR_CTRL);
+	etb_writel(t, 0, ETBR_CTRL);
+
+	etb_writel(t, 0, ETBR_TRIGGERCOUNT);
+	etb_writel(t, 0, ETBR_READADDR);
+	etb_writel(t, 0, ETBR_WRITEADDR);
+
+	etb_lock(t);
+}
+
+static void sysrq_etm_dump(int key, struct tty_struct *tty)
+{
+	dev_dbg(tracer.dev, "Dumping ETB buffer\n");
+	etm_dump();
+}
+
+static struct sysrq_key_op sysrq_etm_op = {
+	.handler = sysrq_etm_dump,
+	.help_msg = "ETM buffer dump",
+	.action_msg = "etm",
+};
+
+static int etb_open(struct inode *inode, struct file *file)
+{
+	if (!tracer.etb_regs)
+		return -ENODEV;
+
+	file->private_data = &tracer;
+
+	return nonseekable_open(inode, file);
+}
+
+static ssize_t etb_read(struct file *file, char __user *data,
+		size_t len, loff_t *ppos)
+{
+	int total, i;
+	long length;
+	struct tracectx *t = file->private_data;
+	u32 first = 0;
+	u32 *buf;
+
+	mutex_lock(&t->mutex);
+
+	if (trace_isrunning(t)) {
+		length = 0;
+		goto out;
+	}
+
+	etb_unlock(t);
+
+	total = etb_getdatalen(t);
+	if (total == t->etb_bufsz)
+		first = etb_readl(t, ETBR_WRITEADDR);
+
+	etb_writel(t, first, ETBR_READADDR);
+
+	length = min(total * 4, (int)len);
+	buf = vmalloc(length);
+
+	dev_dbg(t->dev, "ETB buffer length: %d\n", total);
+	dev_dbg(t->dev, "ETB status reg: %x\n", etb_readl(t, ETBR_STATUS));
+	for (i = 0; i < length / 4; i++)
+		buf[i] = etb_readl(t, ETBR_READMEM);
+
+	/* the only way to deassert overflow bit in ETB status is this */
+	etb_writel(t, 1, ETBR_CTRL);
+	etb_writel(t, 0, ETBR_CTRL);
+
+	etb_writel(t, 0, ETBR_WRITEADDR);
+	etb_writel(t, 0, ETBR_READADDR);
+	etb_writel(t, 0, ETBR_TRIGGERCOUNT);
+
+	etb_lock(t);
+
+	length -= copy_to_user(data, buf, length);
+	vfree(buf);
+
+out:
+	mutex_unlock(&t->mutex);
+
+	return length;
+}
+
+static int etb_release(struct inode *inode, struct file *file)
+{
+	/* there's nothing to do here, actually */
+	return 0;
+}
+
+static const struct file_operations etb_fops = {
+	.owner = THIS_MODULE,
+	.read = etb_read,
+	.open = etb_open,
+	.release = etb_release,
+};
+
+static struct miscdevice etb_miscdev = {
+	.name = "tracebuf",
+	.minor = 0,
+	.fops = &etb_fops,
+};
+
+static int __init etb_probe(struct amba_device *dev, struct amba_id *id)
+{
+	struct tracectx *t = &tracer;
+	int ret = 0;
+
+	ret = amba_request_regions(dev, NULL);
+	if (ret)
+		goto out;
+
+	t->etb_regs = ioremap_nocache(dev->res.start, resource_size(&dev->res));
+	if (!t->etb_regs) {
+		ret = -ENOMEM;
+		goto out_release;
+	}
+
+	amba_set_drvdata(dev, t);
+
+	etb_miscdev.parent = &dev->dev;
+
+	ret = misc_register(&etb_miscdev);
+	if (ret)
+		goto out_unmap;
+
+	t->emu_clk = clk_get(&dev->dev, "emu_src_ck");
+	if (IS_ERR(t->emu_clk)) {
+		dev_dbg(&dev->dev, "Failed to obtain emu_src_ck.\n");
+		return -EFAULT;
+	}
+
+	clk_enable(t->emu_clk);
+
+	etb_unlock(t);
+	t->etb_bufsz = etb_readl(t, ETBR_DEPTH);
+	dev_dbg(&dev->dev, "Size: %x\n", t->etb_bufsz);
+
+	/* make sure trace capture is disabled */
+	etb_writel(t, 0, ETBR_CTRL);
+	etb_writel(t, 0x1000, ETBR_FORMATTERCTRL);
+	etb_lock(t);
+
+	dev_dbg(&dev->dev, "ETB AMBA driver initialized.\n");
+
+out:
+	return ret;
+
+out_unmap:
+	amba_set_drvdata(dev, NULL);
+	iounmap(t->etb_regs);
+
+out_release:
+	amba_release_regions(dev);
+
+	return ret;
+}
+
+static int etb_remove(struct amba_device *dev)
+{
+	struct tracectx *t = amba_get_drvdata(dev);
+
+	amba_set_drvdata(dev, NULL);
+
+	iounmap(t->etb_regs);
+	t->etb_regs = NULL;
+
+	clk_disable(t->emu_clk);
+	clk_put(t->emu_clk);
+
+	amba_release_regions(dev);
+
+	return 0;
+}
+
+static struct amba_id etb_ids[] = {
+	{
+		.id	= 0x0003b907,
+		.mask	= 0x0007ffff,
+	},
+	{ 0, 0 },
+};
+
+static struct amba_driver etb_driver = {
+	.drv		= {
+		.name	= "etb",
+		.owner	= THIS_MODULE,
+	},
+	.probe		= etb_probe,
+	.remove		= etb_remove,
+	.id_table	= etb_ids,
+};
+
+/* use a sysfs file "trace_running" to start/stop tracing */
+static ssize_t trace_running_show(struct kobject *kobj,
+				  struct kobj_attribute *attr,
+				  char *buf)
+{
+	return sprintf(buf, "%x\n", trace_isrunning(&tracer));
+}
+
+static ssize_t trace_running_store(struct kobject *kobj,
+				   struct kobj_attribute *attr,
+				   const char *buf, size_t n)
+{
+	unsigned int value;
+	int ret;
+
+	if (sscanf(buf, "%u", &value) != 1)
+		return -EINVAL;
+
+	mutex_lock(&tracer.mutex);
+	ret = value ? trace_start(&tracer) : trace_stop(&tracer);
+	mutex_unlock(&tracer.mutex);
+
+	return ret ? : n;
+}
+
+static struct kobj_attribute trace_running_attr =
+	__ATTR(trace_running, 0644, trace_running_show, trace_running_store);
+
+static ssize_t trace_info_show(struct kobject *kobj,
+				  struct kobj_attribute *attr,
+				  char *buf)
+{
+	u32 etb_wa, etb_ra, etb_st, etb_fc, etm_ctrl, etm_st;
+	int datalen;
+
+	etb_unlock(&tracer);
+	datalen = etb_getdatalen(&tracer);
+	etb_wa = etb_readl(&tracer, ETBR_WRITEADDR);
+	etb_ra = etb_readl(&tracer, ETBR_READADDR);
+	etb_st = etb_readl(&tracer, ETBR_STATUS);
+	etb_fc = etb_readl(&tracer, ETBR_FORMATTERCTRL);
+	etb_lock(&tracer);
+
+	etm_unlock(&tracer);
+	etm_ctrl = etm_readl(&tracer, ETMR_CTRL);
+	etm_st = etm_readl(&tracer, ETMR_STATUS);
+	etm_lock(&tracer);
+
+	return sprintf(buf, "Trace buffer len: %d\nComparator pairs: %d\n"
+			"ETBR_WRITEADDR:\t%08x\n"
+			"ETBR_READADDR:\t%08x\n"
+			"ETBR_STATUS:\t%08x\n"
+			"ETBR_FORMATTERCTRL:\t%08x\n"
+			"ETMR_CTRL:\t%08x\n"
+			"ETMR_STATUS:\t%08x\n",
+			datalen,
+			tracer.ncmppairs,
+			etb_wa,
+			etb_ra,
+			etb_st,
+			etb_fc,
+			etm_ctrl,
+			etm_st
+			);
+}
+
+static struct kobj_attribute trace_info_attr =
+	__ATTR(trace_info, 0444, trace_info_show, NULL);
+
+static ssize_t trace_mode_show(struct kobject *kobj,
+				  struct kobj_attribute *attr,
+				  char *buf)
+{
+	return sprintf(buf, "%d %d\n",
+			!!(tracer.flags & TRACER_CYCLE_ACC),
+			tracer.etm_portsz);
+}
+
+static ssize_t trace_mode_store(struct kobject *kobj,
+				   struct kobj_attribute *attr,
+				   const char *buf, size_t n)
+{
+	unsigned int cycacc, portsz;
+
+	if (sscanf(buf, "%u %u", &cycacc, &portsz) != 2)
+		return -EINVAL;
+
+	mutex_lock(&tracer.mutex);
+	if (cycacc)
+		tracer.flags |= TRACER_CYCLE_ACC;
+	else
+		tracer.flags &= ~TRACER_CYCLE_ACC;
+
+	tracer.etm_portsz = portsz & 0x0f;
+	mutex_unlock(&tracer.mutex);
+
+	return n;
+}
+
+static struct kobj_attribute trace_mode_attr =
+	__ATTR(trace_mode, 0644, trace_mode_show, trace_mode_store);
+
+static int __init etm_probe(struct amba_device *dev, struct amba_id *id)
+{
+	struct tracectx *t = &tracer;
+	int ret = 0;
+
+	if (t->etm_regs) {
+		dev_dbg(&dev->dev, "ETM already initialized\n");
+		ret = -EBUSY;
+		goto out;
+	}
+
+	ret = amba_request_regions(dev, NULL);
+	if (ret)
+		goto out;
+
+	t->etm_regs = ioremap_nocache(dev->res.start, resource_size(&dev->res));
+	if (!t->etm_regs) {
+		ret = -ENOMEM;
+		goto out_release;
+	}
+
+	amba_set_drvdata(dev, t);
+
+	mutex_init(&t->mutex);
+	t->dev = &dev->dev;
+	t->flags = TRACER_CYCLE_ACC;
+	t->etm_portsz = 1;
+
+	etm_unlock(t);
+	ret = etm_readl(t, CSCR_PRSR);
+
+	t->ncmppairs = etm_readl(t, ETMR_CONFCODE) & 0xf;
+	etm_writel(t, 0x440, ETMR_CTRL);
+	etm_lock(t);
+
+	ret = sysfs_create_file(&dev->dev.kobj,
+			&trace_running_attr.attr);
+	if (ret)
+		goto out_unmap;
+
+	/* failing to create any of these two is not fatal */
+	ret = sysfs_create_file(&dev->dev.kobj, &trace_info_attr.attr);
+	if (ret)
+		dev_dbg(&dev->dev, "Failed to create trace_info in sysfs\n");
+
+	ret = sysfs_create_file(&dev->dev.kobj, &trace_mode_attr.attr);
+	if (ret)
+		dev_dbg(&dev->dev, "Failed to create trace_mode in sysfs\n");
+
+	dev_dbg(t->dev, "ETM AMBA driver initialized.\n");
+
+out:
+	return ret;
+
+out_unmap:
+	amba_set_drvdata(dev, NULL);
+	iounmap(t->etm_regs);
+
+out_release:
+	amba_release_regions(dev);
+
+	return ret;
+}
+
+static int etm_remove(struct amba_device *dev)
+{
+	struct tracectx *t = amba_get_drvdata(dev);
+
+	amba_set_drvdata(dev, NULL);
+
+	iounmap(t->etm_regs);
+	t->etm_regs = NULL;
+
+	amba_release_regions(dev);
+
+	sysfs_remove_file(&dev->dev.kobj, &trace_running_attr.attr);
+	sysfs_remove_file(&dev->dev.kobj, &trace_info_attr.attr);
+	sysfs_remove_file(&dev->dev.kobj, &trace_mode_attr.attr);
+
+	return 0;
+}
+
+static struct amba_id etm_ids[] = {
+	{
+		.id	= 0x0003b921,
+		.mask	= 0x0007ffff,
+	},
+	{ 0, 0 },
+};
+
+static struct amba_driver etm_driver = {
+	.drv		= {
+		.name   = "etm",
+		.owner  = THIS_MODULE,
+	},
+	.probe		= etm_probe,
+	.remove		= etm_remove,
+	.id_table	= etm_ids,
+};
+
+static int __init etm_init(void)
+{
+	int retval;
+
+	retval = amba_driver_register(&etb_driver);
+	if (retval) {
+		printk(KERN_ERR "Failed to register etb\n");
+		return retval;
+	}
+
+	retval = amba_driver_register(&etm_driver);
+	if (retval) {
+		amba_driver_unregister(&etb_driver);
+		printk(KERN_ERR "Failed to probe etm\n");
+		return retval;
+	}
+
+	/* not being able to install this handler is not fatal */
+	(void)register_sysrq_key('v', &sysrq_etm_op);
+
+	return 0;
+}
+
+device_initcall(etm_init);
+