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coresight-etm4x: Adding CoreSight ETM4x driver

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This driver manages the CoreSight ETMv4 (Embedded Trace Macrocell) IP block
to support HW assisted tracing on ARMv7 and ARMv8 architectures.

Signed-off-by: Pratik Patel <pratikp@codeaurora.org>
Signed-off-by: Kaixu Xia <xiakaixu@huawei.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Pratik Patel 2015-05-13 10:34:09 -06:00 committed by Greg Kroah-Hartman
parent f5da7cb24b
commit 2e1cdfe184
5 changed files with 1115 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

15
Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x Normal file
View file

@ -0,0 +1,15 @@
What: /sys/bus/coresight/devices/<memory_map>.etm/enable_source
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (RW) Enable/disable tracing on this specific trace entiry.
Enabling a source implies the source has been configured
properly and a sink has been identidifed for it. The path
of coresight components linking the source to the sink is
configured and managed automatically by the coresight framework.
What: /sys/bus/coresight/devices/<memory_map>.etm/cpu
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (R) The CPU this tracing entity is associated with.

11
drivers/hwtracing/coresight/Kconfig
View file

@ -58,4 +58,15 @@ config CORESIGHT_SOURCE_ETM3X
which allows tracing the instructions that a processor is executing which allows tracing the instructions that a processor is executing
This is primarily useful for instruction level tracing. Depending This is primarily useful for instruction level tracing. Depending
the ETM version data tracing may also be available. the ETM version data tracing may also be available.
config CORESIGHT_SOURCE_ETM4X
bool "CoreSight Embedded Trace Macrocell 4.x driver"
depends on ARM64
select CORESIGHT_LINKS_AND_SINKS
help
This driver provides support for the ETM4.x tracer module, tracing the
instructions that a processor is executing. This is primarily useful
for instruction level tracing. Depending on the implemented version
data tracing may also be available.
endif endif

1
drivers/hwtracing/coresight/Makefile
View file

@ -9,3 +9,4 @@ obj-$(CONFIG_CORESIGHT_SINK_ETBV10) += coresight-etb10.o
obj-$(CONFIG_CORESIGHT_LINKS_AND_SINKS) += coresight-funnel.o \ obj-$(CONFIG_CORESIGHT_LINKS_AND_SINKS) += coresight-funnel.o \
coresight-replicator.o coresight-replicator.o
obj-$(CONFIG_CORESIGHT_SOURCE_ETM3X) += coresight-etm3x.o coresight-etm-cp14.o obj-$(CONFIG_CORESIGHT_SOURCE_ETM3X) += coresight-etm3x.o coresight-etm-cp14.o
obj-$(CONFIG_CORESIGHT_SOURCE_ETM4X) += coresight-etm4x.o

697
drivers/hwtracing/coresight/coresight-etm4x.c Normal file
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@ -0,0 +1,697 @@
/* Copyright (c) 2014, 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/moduleparam.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/device.h>
#include <linux/io.h>
#include <linux/err.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/smp.h>
#include <linux/sysfs.h>
#include <linux/stat.h>
#include <linux/clk.h>
#include <linux/cpu.h>
#include <linux/coresight.h>
#include <linux/pm_wakeup.h>
#include <linux/amba/bus.h>
#include <linux/seq_file.h>
#include <linux/uaccess.h>
#include <linux/pm_runtime.h>
#include <asm/sections.h>
#include "coresight-etm4x.h"
static int boot_enable;
module_param_named(boot_enable, boot_enable, int, S_IRUGO);
/* The number of ETMv4 currently registered */
static int etm4_count;
static struct etmv4_drvdata *etmdrvdata[NR_CPUS];
static void etm4_os_unlock(void *info)
{
struct etmv4_drvdata *drvdata = (struct etmv4_drvdata *)info;
/* Writing any value to ETMOSLAR unlocks the trace registers */
writel_relaxed(0x0, drvdata->base + TRCOSLAR);
isb();
}
static bool etm4_arch_supported(u8 arch)
{
switch (arch) {
case ETM_ARCH_V4:
break;
default:
return false;
}
return true;
}
static int etm4_trace_id(struct coresight_device *csdev)
{
struct etmv4_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
unsigned long flags;
int trace_id = -1;
if (!drvdata->enable)
return drvdata->trcid;
pm_runtime_get_sync(drvdata->dev);
spin_lock_irqsave(&drvdata->spinlock, flags);
CS_UNLOCK(drvdata->base);
trace_id = readl_relaxed(drvdata->base + TRCTRACEIDR);
trace_id &= ETM_TRACEID_MASK;
CS_LOCK(drvdata->base);
spin_unlock_irqrestore(&drvdata->spinlock, flags);
pm_runtime_put(drvdata->dev);
return trace_id;
}
static void etm4_enable_hw(void *info)
{
int i;
struct etmv4_drvdata *drvdata = info;
CS_UNLOCK(drvdata->base);
etm4_os_unlock(drvdata);
/* Disable the trace unit before programming trace registers */
writel_relaxed(0, drvdata->base + TRCPRGCTLR);
/* wait for TRCSTATR.IDLE to go up */
if (coresight_timeout(drvdata->base, TRCSTATR, TRCSTATR_IDLE_BIT, 1))
dev_err(drvdata->dev,
"timeout observed when probing at offset %#x\n",
TRCSTATR);
writel_relaxed(drvdata->pe_sel, drvdata->base + TRCPROCSELR);
writel_relaxed(drvdata->cfg, drvdata->base + TRCCONFIGR);
/* nothing specific implemented */
writel_relaxed(0x0, drvdata->base + TRCAUXCTLR);
writel_relaxed(drvdata->eventctrl0, drvdata->base + TRCEVENTCTL0R);
writel_relaxed(drvdata->eventctrl1, drvdata->base + TRCEVENTCTL1R);
writel_relaxed(drvdata->stall_ctrl, drvdata->base + TRCSTALLCTLR);
writel_relaxed(drvdata->ts_ctrl, drvdata->base + TRCTSCTLR);
writel_relaxed(drvdata->syncfreq, drvdata->base + TRCSYNCPR);
writel_relaxed(drvdata->ccctlr, drvdata->base + TRCCCCTLR);
writel_relaxed(drvdata->bb_ctrl, drvdata->base + TRCBBCTLR);
writel_relaxed(drvdata->trcid, drvdata->base + TRCTRACEIDR);
writel_relaxed(drvdata->vinst_ctrl, drvdata->base + TRCVICTLR);
writel_relaxed(drvdata->viiectlr, drvdata->base + TRCVIIECTLR);
writel_relaxed(drvdata->vissctlr,
drvdata->base + TRCVISSCTLR);
writel_relaxed(drvdata->vipcssctlr,
drvdata->base + TRCVIPCSSCTLR);
for (i = 0; i < drvdata->nrseqstate - 1; i++)
writel_relaxed(drvdata->seq_ctrl[i],
drvdata->base + TRCSEQEVRn(i));
writel_relaxed(drvdata->seq_rst, drvdata->base + TRCSEQRSTEVR);
writel_relaxed(drvdata->seq_state, drvdata->base + TRCSEQSTR);
writel_relaxed(drvdata->ext_inp, drvdata->base + TRCEXTINSELR);
for (i = 0; i < drvdata->nr_cntr; i++) {
writel_relaxed(drvdata->cntrldvr[i],
drvdata->base + TRCCNTRLDVRn(i));
writel_relaxed(drvdata->cntr_ctrl[i],
drvdata->base + TRCCNTCTLRn(i));
writel_relaxed(drvdata->cntr_val[i],
drvdata->base + TRCCNTVRn(i));
}
for (i = 0; i < drvdata->nr_resource; i++)
writel_relaxed(drvdata->res_ctrl[i],
drvdata->base + TRCRSCTLRn(i));
for (i = 0; i < drvdata->nr_ss_cmp; i++) {
writel_relaxed(drvdata->ss_ctrl[i],
drvdata->base + TRCSSCCRn(i));
writel_relaxed(drvdata->ss_status[i],
drvdata->base + TRCSSCSRn(i));
writel_relaxed(drvdata->ss_pe_cmp[i],
drvdata->base + TRCSSPCICRn(i));
}
for (i = 0; i < drvdata->nr_addr_cmp; i++) {
writeq_relaxed(drvdata->addr_val[i],
drvdata->base + TRCACVRn(i));
writeq_relaxed(drvdata->addr_acc[i],
drvdata->base + TRCACATRn(i));
}
for (i = 0; i < drvdata->numcidc; i++)
writeq_relaxed(drvdata->ctxid_val[i],
drvdata->base + TRCCIDCVRn(i));
writel_relaxed(drvdata->ctxid_mask0, drvdata->base + TRCCIDCCTLR0);
writel_relaxed(drvdata->ctxid_mask1, drvdata->base + TRCCIDCCTLR1);
for (i = 0; i < drvdata->numvmidc; i++)
writeq_relaxed(drvdata->vmid_val[i],
drvdata->base + TRCVMIDCVRn(i));
writel_relaxed(drvdata->vmid_mask0, drvdata->base + TRCVMIDCCTLR0);
writel_relaxed(drvdata->vmid_mask1, drvdata->base + TRCVMIDCCTLR1);
/* Enable the trace unit */
writel_relaxed(1, drvdata->base + TRCPRGCTLR);
/* wait for TRCSTATR.IDLE to go back down to '0' */
if (coresight_timeout(drvdata->base, TRCSTATR, TRCSTATR_IDLE_BIT, 0))
dev_err(drvdata->dev,
"timeout observed when probing at offset %#x\n",
TRCSTATR);
CS_LOCK(drvdata->base);
dev_dbg(drvdata->dev, "cpu: %d enable smp call done\n", drvdata->cpu);
}
static int etm4_enable(struct coresight_device *csdev)
{
struct etmv4_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
int ret;
pm_runtime_get_sync(drvdata->dev);
spin_lock(&drvdata->spinlock);
/*
* Executing etm4_enable_hw on the cpu whose ETM is being enabled
* ensures that register writes occur when cpu is powered.
*/
ret = smp_call_function_single(drvdata->cpu,
etm4_enable_hw, drvdata, 1);
if (ret)
goto err;
drvdata->enable = true;
drvdata->sticky_enable = true;
spin_unlock(&drvdata->spinlock);
dev_info(drvdata->dev, "ETM tracing enabled\n");
return 0;
err:
spin_unlock(&drvdata->spinlock);
pm_runtime_put(drvdata->dev);
return ret;
}
static void etm4_disable_hw(void *info)
{
u32 control;
struct etmv4_drvdata *drvdata = info;
CS_UNLOCK(drvdata->base);
control = readl_relaxed(drvdata->base + TRCPRGCTLR);
/* EN, bit[0] Trace unit enable bit */
control &= ~0x1;
/* make sure everything completes before disabling */
mb();
isb();
writel_relaxed(control, drvdata->base + TRCPRGCTLR);
CS_LOCK(drvdata->base);
dev_dbg(drvdata->dev, "cpu: %d disable smp call done\n", drvdata->cpu);
}
static void etm4_disable(struct coresight_device *csdev)
{
struct etmv4_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
/*
* Taking hotplug lock here protects from clocks getting disabled
* with tracing being left on (crash scenario) if user disable occurs
* after cpu online mask indicates the cpu is offline but before the
* DYING hotplug callback is serviced by the ETM driver.
*/
get_online_cpus();
spin_lock(&drvdata->spinlock);
/*
* Executing etm4_disable_hw on the cpu whose ETM is being disabled
* ensures that register writes occur when cpu is powered.
*/
smp_call_function_single(drvdata->cpu, etm4_disable_hw, drvdata, 1);
drvdata->enable = false;
spin_unlock(&drvdata->spinlock);
put_online_cpus();
pm_runtime_put(drvdata->dev);
dev_info(drvdata->dev, "ETM tracing disabled\n");
}
static const struct coresight_ops_source etm4_source_ops = {
.trace_id = etm4_trace_id,
.enable = etm4_enable,
.disable = etm4_disable,
};
static const struct coresight_ops etm4_cs_ops = {
.source_ops = &etm4_source_ops,
};
static ssize_t cpu_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
int val;
struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
val = drvdata->cpu;
return scnprintf(buf, PAGE_SIZE, "%d\n", val);
}
static DEVICE_ATTR_RO(cpu);
static struct attribute *coresight_etmv4_attrs[] = {
&dev_attr_cpu.attr,
NULL,
};
ATTRIBUTE_GROUPS(coresight_etmv4);
static void etm4_init_arch_data(void *info)
{
u32 etmidr0;
u32 etmidr1;
u32 etmidr2;
u32 etmidr3;
u32 etmidr4;
u32 etmidr5;
struct etmv4_drvdata *drvdata = info;
CS_UNLOCK(drvdata->base);
/* find all capabilities of the tracing unit */
etmidr0 = readl_relaxed(drvdata->base + TRCIDR0);
/* INSTP0, bits[2:1] P0 tracing support field */
if (BMVAL(etmidr0, 1, 1) && BMVAL(etmidr0, 2, 2))
drvdata->instrp0 = true;
else
drvdata->instrp0 = false;
/* TRCBB, bit[5] Branch broadcast tracing support bit */
if (BMVAL(etmidr0, 5, 5))
drvdata->trcbb = true;
else
drvdata->trcbb = false;
/* TRCCOND, bit[6] Conditional instruction tracing support bit */
if (BMVAL(etmidr0, 6, 6))
drvdata->trccond = true;
else
drvdata->trccond = false;
/* TRCCCI, bit[7] Cycle counting instruction bit */
if (BMVAL(etmidr0, 7, 7))
drvdata->trccci = true;
else
drvdata->trccci = false;
/* RETSTACK, bit[9] Return stack bit */
if (BMVAL(etmidr0, 9, 9))
drvdata->retstack = true;
else
drvdata->retstack = false;
/* NUMEVENT, bits[11:10] Number of events field */
drvdata->nr_event = BMVAL(etmidr0, 10, 11);
/* QSUPP, bits[16:15] Q element support field */
drvdata->q_support = BMVAL(etmidr0, 15, 16);
/* TSSIZE, bits[28:24] Global timestamp size field */
drvdata->ts_size = BMVAL(etmidr0, 24, 28);
/* base architecture of trace unit */
etmidr1 = readl_relaxed(drvdata->base + TRCIDR1);
/*
* TRCARCHMIN, bits[7:4] architecture the minor version number
* TRCARCHMAJ, bits[11:8] architecture major versin number
*/
drvdata->arch = BMVAL(etmidr1, 4, 11);
/* maximum size of resources */
etmidr2 = readl_relaxed(drvdata->base + TRCIDR2);
/* CIDSIZE, bits[9:5] Indicates the Context ID size */
drvdata->ctxid_size = BMVAL(etmidr2, 5, 9);
/* VMIDSIZE, bits[14:10] Indicates the VMID size */
drvdata->vmid_size = BMVAL(etmidr2, 10, 14);
/* CCSIZE, bits[28:25] size of the cycle counter in bits minus 12 */
drvdata->ccsize = BMVAL(etmidr2, 25, 28);
etmidr3 = readl_relaxed(drvdata->base + TRCIDR3);
/* CCITMIN, bits[11:0] minimum threshold value that can be programmed */
drvdata->ccitmin = BMVAL(etmidr3, 0, 11);
/* EXLEVEL_S, bits[19:16] Secure state instruction tracing */
drvdata->s_ex_level = BMVAL(etmidr3, 16, 19);
/* EXLEVEL_NS, bits[23:20] Non-secure state instruction tracing */
drvdata->ns_ex_level = BMVAL(etmidr3, 20, 23);
/*
* TRCERR, bit[24] whether a trace unit can trace a
* system error exception.
*/
if (BMVAL(etmidr3, 24, 24))
drvdata->trc_error = true;
else
drvdata->trc_error = false;
/* SYNCPR, bit[25] implementation has a fixed synchronization period? */
if (BMVAL(etmidr3, 25, 25))
drvdata->syncpr = true;
else
drvdata->syncpr = false;
/* STALLCTL, bit[26] is stall control implemented? */
if (BMVAL(etmidr3, 26, 26))
drvdata->stallctl = true;
else
drvdata->stallctl = false;
/* SYSSTALL, bit[27] implementation can support stall control? */
if (BMVAL(etmidr3, 27, 27))
drvdata->sysstall = true;
else
drvdata->sysstall = false;
/* NUMPROC, bits[30:28] the number of PEs available for tracing */
drvdata->nr_pe = BMVAL(etmidr3, 28, 30);
/* NOOVERFLOW, bit[31] is trace overflow prevention supported */
if (BMVAL(etmidr3, 31, 31))
drvdata->nooverflow = true;
else
drvdata->nooverflow = false;
/* number of resources trace unit supports */
etmidr4 = readl_relaxed(drvdata->base + TRCIDR4);
/* NUMACPAIRS, bits[0:3] number of addr comparator pairs for tracing */
drvdata->nr_addr_cmp = BMVAL(etmidr4, 0, 3);
/* NUMPC, bits[15:12] number of PE comparator inputs for tracing */
drvdata->nr_pe_cmp = BMVAL(etmidr4, 12, 15);
/* NUMRSPAIR, bits[19:16] the number of resource pairs for tracing */
drvdata->nr_resource = BMVAL(etmidr4, 16, 19);
/*
* NUMSSCC, bits[23:20] the number of single-shot
* comparator control for tracing
*/
drvdata->nr_ss_cmp = BMVAL(etmidr4, 20, 23);
/* NUMCIDC, bits[27:24] number of Context ID comparators for tracing */
drvdata->numcidc = BMVAL(etmidr4, 24, 27);
/* NUMVMIDC, bits[31:28] number of VMID comparators for tracing */
drvdata->numvmidc = BMVAL(etmidr4, 28, 31);
etmidr5 = readl_relaxed(drvdata->base + TRCIDR5);
/* NUMEXTIN, bits[8:0] number of external inputs implemented */
drvdata->nr_ext_inp = BMVAL(etmidr5, 0, 8);
/* TRACEIDSIZE, bits[21:16] indicates the trace ID width */
drvdata->trcid_size = BMVAL(etmidr5, 16, 21);
/* ATBTRIG, bit[22] implementation can support ATB triggers? */
if (BMVAL(etmidr5, 22, 22))
drvdata->atbtrig = true;
else
drvdata->atbtrig = false;
/*
* LPOVERRIDE, bit[23] implementation supports
* low-power state override
*/
if (BMVAL(etmidr5, 23, 23))
drvdata->lpoverride = true;
else
drvdata->lpoverride = false;
/* NUMSEQSTATE, bits[27:25] number of sequencer states implemented */
drvdata->nrseqstate = BMVAL(etmidr5, 25, 27);
/* NUMCNTR, bits[30:28] number of counters available for tracing */
drvdata->nr_cntr = BMVAL(etmidr5, 28, 30);
CS_LOCK(drvdata->base);
}
static void etm4_init_default_data(struct etmv4_drvdata *drvdata)
{
int i;
drvdata->pe_sel = 0x0;
drvdata->cfg = (ETMv4_MODE_CTXID | ETM_MODE_VMID |
ETMv4_MODE_TIMESTAMP | ETM_MODE_RETURNSTACK);
/* disable all events tracing */
drvdata->eventctrl0 = 0x0;
drvdata->eventctrl1 = 0x0;
/* disable stalling */
drvdata->stall_ctrl = 0x0;
/* disable timestamp event */
drvdata->ts_ctrl = 0x0;
/* enable trace synchronization every 4096 bytes for trace */
if (drvdata->syncpr == false)
drvdata->syncfreq = 0xC;
/*
* enable viewInst to trace everything with start-stop logic in
* started state
*/
drvdata->vinst_ctrl |= BIT(0);
/* set initial state of start-stop logic */
if (drvdata->nr_addr_cmp)
drvdata->vinst_ctrl |= BIT(9);
/* no address range filtering for ViewInst */
drvdata->viiectlr = 0x0;
/* no start-stop filtering for ViewInst */
drvdata->vissctlr = 0x0;
/* disable seq events */
for (i = 0; i < drvdata->nrseqstate-1; i++)
drvdata->seq_ctrl[i] = 0x0;
drvdata->seq_rst = 0x0;
drvdata->seq_state = 0x0;
/* disable external input events */
drvdata->ext_inp = 0x0;
for (i = 0; i < drvdata->nr_cntr; i++) {
drvdata->cntrldvr[i] = 0x0;
drvdata->cntr_ctrl[i] = 0x0;
drvdata->cntr_val[i] = 0x0;
}
for (i = 2; i < drvdata->nr_resource * 2; i++)
drvdata->res_ctrl[i] = 0x0;
for (i = 0; i < drvdata->nr_ss_cmp; i++) {
drvdata->ss_ctrl[i] = 0x0;
drvdata->ss_pe_cmp[i] = 0x0;
}
if (drvdata->nr_addr_cmp >= 1) {
drvdata->addr_val[0] = (unsigned long)_stext;
drvdata->addr_val[1] = (unsigned long)_etext;
drvdata->addr_type[0] = ETM_ADDR_TYPE_RANGE;
drvdata->addr_type[1] = ETM_ADDR_TYPE_RANGE;
}
for (i = 0; i < drvdata->numcidc; i++)
drvdata->ctxid_val[i] = 0x0;
drvdata->ctxid_mask0 = 0x0;
drvdata->ctxid_mask1 = 0x0;
for (i = 0; i < drvdata->numvmidc; i++)
drvdata->vmid_val[i] = 0x0;
drvdata->vmid_mask0 = 0x0;
drvdata->vmid_mask1 = 0x0;
/*
* A trace ID value of 0 is invalid, so let's start at some
* random value that fits in 7 bits. ETMv3.x has 0x10 so let's
* start at 0x20.
*/
drvdata->trcid = 0x20 + drvdata->cpu;
}
static int etm4_cpu_callback(struct notifier_block *nfb, unsigned long action,
void *hcpu)
{
unsigned int cpu = (unsigned long)hcpu;
if (!etmdrvdata[cpu])
goto out;
switch (action & (~CPU_TASKS_FROZEN)) {
case CPU_STARTING:
spin_lock(&etmdrvdata[cpu]->spinlock);
if (!etmdrvdata[cpu]->os_unlock) {
etm4_os_unlock(etmdrvdata[cpu]);
etmdrvdata[cpu]->os_unlock = true;
}
if (etmdrvdata[cpu]->enable)
etm4_enable_hw(etmdrvdata[cpu]);
spin_unlock(&etmdrvdata[cpu]->spinlock);
break;
case CPU_ONLINE:
if (etmdrvdata[cpu]->boot_enable &&
!etmdrvdata[cpu]->sticky_enable)
coresight_enable(etmdrvdata[cpu]->csdev);
break;
case CPU_DYING:
spin_lock(&etmdrvdata[cpu]->spinlock);
if (etmdrvdata[cpu]->enable)
etm4_disable_hw(etmdrvdata[cpu]);
spin_unlock(&etmdrvdata[cpu]->spinlock);
break;
}
out:
return NOTIFY_OK;
}
static struct notifier_block etm4_cpu_notifier = {
.notifier_call = etm4_cpu_callback,
};
static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
{
int ret;
void __iomem *base;
struct device *dev = &adev->dev;
struct coresight_platform_data *pdata = NULL;
struct etmv4_drvdata *drvdata;
struct resource *res = &adev->res;
struct coresight_desc *desc;
struct device_node *np = adev->dev.of_node;
desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
if (!desc)
return -ENOMEM;
drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
if (!drvdata)
return -ENOMEM;
if (np) {
pdata = of_get_coresight_platform_data(dev, np);
if (IS_ERR(pdata))
return PTR_ERR(pdata);
adev->dev.platform_data = pdata;
}
drvdata->dev = &adev->dev;
dev_set_drvdata(dev, drvdata);
/* Validity for the resource is already checked by the AMBA core */
base = devm_ioremap_resource(dev, res);
if (IS_ERR(base))
return PTR_ERR(base);
drvdata->base = base;
spin_lock_init(&drvdata->spinlock);
drvdata->cpu = pdata ? pdata->cpu : 0;
get_online_cpus();
etmdrvdata[drvdata->cpu] = drvdata;
if (!smp_call_function_single(drvdata->cpu, etm4_os_unlock, drvdata, 1))
drvdata->os_unlock = true;
if (smp_call_function_single(drvdata->cpu,
etm4_init_arch_data, drvdata, 1))
dev_err(dev, "ETM arch init failed\n");
if (!etm4_count++)
register_hotcpu_notifier(&etm4_cpu_notifier);
put_online_cpus();
if (etm4_arch_supported(drvdata->arch) == false) {
ret = -EINVAL;
goto err_arch_supported;
}
etm4_init_default_data(drvdata);
pm_runtime_put(&adev->dev);
desc->type = CORESIGHT_DEV_TYPE_SOURCE;
desc->subtype.source_subtype = CORESIGHT_DEV_SUBTYPE_SOURCE_PROC;
desc->ops = &etm4_cs_ops;
desc->pdata = pdata;
desc->dev = dev;
desc->groups = coresight_etmv4_groups;
drvdata->csdev = coresight_register(desc);
if (IS_ERR(drvdata->csdev)) {
ret = PTR_ERR(drvdata->csdev);
goto err_coresight_register;
}
dev_info(dev, "%s initialized\n", (char *)id->data);
if (boot_enable) {
coresight_enable(drvdata->csdev);
drvdata->boot_enable = true;
}
return 0;
err_arch_supported:
pm_runtime_put(&adev->dev);
err_coresight_register:
if (--etm4_count == 0)
unregister_hotcpu_notifier(&etm4_cpu_notifier);
return ret;
}
static int etm4_remove(struct amba_device *adev)
{
struct etmv4_drvdata *drvdata = amba_get_drvdata(adev);
coresight_unregister(drvdata->csdev);
if (--etm4_count == 0)
unregister_hotcpu_notifier(&etm4_cpu_notifier);
return 0;
}
static struct amba_id etm4_ids[] = {
{ /* ETM 4.0 - Qualcomm */
.id = 0x0003b95d,
.mask = 0x0003ffff,
.data = "ETM 4.0",
},
{ /* ETM 4.0 - Juno board */
.id = 0x000bb95e,
.mask = 0x000fffff,
.data = "ETM 4.0",
},
{ 0, 0},
};
static struct amba_driver etm4x_driver = {
.drv = {
.name = "coresight-etm4x",
},
.probe = etm4_probe,
.remove = etm4_remove,
.id_table = etm4_ids,
};
module_amba_driver(etm4x_driver);

391
drivers/hwtracing/coresight/coresight-etm4x.h Normal file
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@ -0,0 +1,391 @@
/* Copyright (c) 2014-2015, 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_CORESIGHT_ETM_H
#define _CORESIGHT_CORESIGHT_ETM_H
#include <linux/spinlock.h>
#include "coresight-priv.h"
/*
* Device registers:
* 0x000 - 0x2FC: Trace registers
* 0x300 - 0x314: Management registers
* 0x318 - 0xEFC: Trace registers
* 0xF00: Management registers
* 0xFA0 - 0xFA4: Trace registers
* 0xFA8 - 0xFFC: Management registers
*/
/* Trace registers (0x000-0x2FC) */
/* Main control and configuration registers */
#define TRCPRGCTLR 0x004
#define TRCPROCSELR 0x008
#define TRCSTATR 0x00C
#define TRCCONFIGR 0x010
#define TRCAUXCTLR 0x018
#define TRCEVENTCTL0R 0x020
#define TRCEVENTCTL1R 0x024
#define TRCSTALLCTLR 0x02C
#define TRCTSCTLR 0x030
#define TRCSYNCPR 0x034
#define TRCCCCTLR 0x038
#define TRCBBCTLR 0x03C
#define TRCTRACEIDR 0x040
#define TRCQCTLR 0x044
/* Filtering control registers */
#define TRCVICTLR 0x080
#define TRCVIIECTLR 0x084
#define TRCVISSCTLR 0x088
#define TRCVIPCSSCTLR 0x08C
#define TRCVDCTLR 0x0A0
#define TRCVDSACCTLR 0x0A4
#define TRCVDARCCTLR 0x0A8
/* Derived resources registers */
#define TRCSEQEVRn(n) (0x100 + (n * 4))
#define TRCSEQRSTEVR 0x118
#define TRCSEQSTR 0x11C
#define TRCEXTINSELR 0x120
#define TRCCNTRLDVRn(n) (0x140 + (n * 4))
#define TRCCNTCTLRn(n) (0x150 + (n * 4))
#define TRCCNTVRn(n) (0x160 + (n * 4))
/* ID registers */
#define TRCIDR8 0x180
#define TRCIDR9 0x184
#define TRCIDR10 0x188
#define TRCIDR11 0x18C
#define TRCIDR12 0x190
#define TRCIDR13 0x194
#define TRCIMSPEC0 0x1C0
#define TRCIMSPECn(n) (0x1C0 + (n * 4))
#define TRCIDR0 0x1E0
#define TRCIDR1 0x1E4
#define TRCIDR2 0x1E8
#define TRCIDR3 0x1EC
#define TRCIDR4 0x1F0
#define TRCIDR5 0x1F4
#define TRCIDR6 0x1F8
#define TRCIDR7 0x1FC
/* Resource selection registers */
#define TRCRSCTLRn(n) (0x200 + (n * 4))
/* Single-shot comparator registers */
#define TRCSSCCRn(n) (0x280 + (n * 4))
#define TRCSSCSRn(n) (0x2A0 + (n * 4))
#define TRCSSPCICRn(n) (0x2C0 + (n * 4))
/* Management registers (0x300-0x314) */
#define TRCOSLAR 0x300
#define TRCOSLSR 0x304
#define TRCPDCR 0x310
#define TRCPDSR 0x314
/* Trace registers (0x318-0xEFC) */
/* Comparator registers */
#define TRCACVRn(n) (0x400 + (n * 8))
#define TRCACATRn(n) (0x480 + (n * 8))
#define TRCDVCVRn(n) (0x500 + (n * 16))
#define TRCDVCMRn(n) (0x580 + (n * 16))
#define TRCCIDCVRn(n) (0x600 + (n * 8))
#define TRCVMIDCVRn(n) (0x640 + (n * 8))
#define TRCCIDCCTLR0 0x680
#define TRCCIDCCTLR1 0x684
#define TRCVMIDCCTLR0 0x688
#define TRCVMIDCCTLR1 0x68C
/* Management register (0xF00) */
/* Integration control registers */
#define TRCITCTRL 0xF00
/* Trace registers (0xFA0-0xFA4) */
/* Claim tag registers */
#define TRCCLAIMSET 0xFA0
#define TRCCLAIMCLR 0xFA4
/* Management registers (0xFA8-0xFFC) */
#define TRCDEVAFF0 0xFA8
#define TRCDEVAFF1 0xFAC
#define TRCLAR 0xFB0
#define TRCLSR 0xFB4
#define TRCAUTHSTATUS 0xFB8
#define TRCDEVARCH 0xFBC
#define TRCDEVID 0xFC8
#define TRCDEVTYPE 0xFCC
#define TRCPIDR4 0xFD0
#define TRCPIDR5 0xFD4
#define TRCPIDR6 0xFD8
#define TRCPIDR7 0xFDC
#define TRCPIDR0 0xFE0
#define TRCPIDR1 0xFE4
#define TRCPIDR2 0xFE8
#define TRCPIDR3 0xFEC
#define TRCCIDR0 0xFF0
#define TRCCIDR1 0xFF4
#define TRCCIDR2 0xFF8
#define TRCCIDR3 0xFFC
/* ETMv4 resources */
#define ETM_MAX_NR_PE 8
#define ETMv4_MAX_CNTR 4
#define ETM_MAX_SEQ_STATES 4
#define ETM_MAX_EXT_INP_SEL 4
#define ETM_MAX_EXT_INP 256
#define ETM_MAX_EXT_OUT 4
#define ETM_MAX_SINGLE_ADDR_CMP 16
#define ETM_MAX_ADDR_RANGE_CMP (ETM_MAX_SINGLE_ADDR_CMP / 2)
#define ETM_MAX_DATA_VAL_CMP 8
#define ETMv4_MAX_CTXID_CMP 8
#define ETM_MAX_VMID_CMP 8
#define ETM_MAX_PE_CMP 8
#define ETM_MAX_RES_SEL 16
#define ETM_MAX_SS_CMP 8
#define ETM_ARCH_V4 0x40
#define ETMv4_SYNC_MASK 0x1F
#define ETM_CYC_THRESHOLD_MASK 0xFFF
#define ETMv4_EVENT_MASK 0xFF
#define ETM_CNTR_MAX_VAL 0xFFFF
#define ETM_TRACEID_MASK 0x3f
/* ETMv4 programming modes */
#define ETM_MODE_EXCLUDE BIT(0)
#define ETM_MODE_LOAD BIT(1)
#define ETM_MODE_STORE BIT(2)
#define ETM_MODE_LOAD_STORE BIT(3)
#define ETM_MODE_BB BIT(4)
#define ETMv4_MODE_CYCACC BIT(5)
#define ETMv4_MODE_CTXID BIT(6)
#define ETM_MODE_VMID BIT(7)
#define ETM_MODE_COND(val) BMVAL(val, 8, 10)
#define ETMv4_MODE_TIMESTAMP BIT(11)
#define ETM_MODE_RETURNSTACK BIT(12)
#define ETM_MODE_QELEM(val) BMVAL(val, 13, 14)
#define ETM_MODE_DATA_TRACE_ADDR BIT(15)
#define ETM_MODE_DATA_TRACE_VAL BIT(16)
#define ETM_MODE_ISTALL BIT(17)
#define ETM_MODE_DSTALL BIT(18)
#define ETM_MODE_ATB_TRIGGER BIT(19)
#define ETM_MODE_LPOVERRIDE BIT(20)
#define ETM_MODE_ISTALL_EN BIT(21)
#define ETM_MODE_DSTALL_EN BIT(22)
#define ETM_MODE_INSTPRIO BIT(23)
#define ETM_MODE_NOOVERFLOW BIT(24)
#define ETM_MODE_TRACE_RESET BIT(25)
#define ETM_MODE_TRACE_ERR BIT(26)
#define ETM_MODE_VIEWINST_STARTSTOP BIT(27)
#define ETMv4_MODE_ALL 0xFFFFFFF
#define TRCSTATR_IDLE_BIT 0
/**
* struct etm4_drvdata - specifics associated to an ETM component
* @base: Memory mapped base address for this component.
* @dev: The device entity associated to this component.
* @csdev: Component vitals needed by the framework.
* @spinlock: Only one at a time pls.
* @cpu: The cpu this component is affined to.
* @arch: ETM version number.
* @enable: Is this ETM currently tracing.
* @sticky_enable: true if ETM base configuration has been done.
* @boot_enable:True if we should start tracing at boot time.
* @os_unlock: True if access to management registers is allowed.
* @nr_pe: The number of processing entity available for tracing.
* @nr_pe_cmp: The number of processing entity comparator inputs that are
* available for tracing.
* @nr_addr_cmp:Number of pairs of address comparators available
* as found in ETMIDR4 0-3.
* @nr_cntr: Number of counters as found in ETMIDR5 bit 28-30.
* @nr_ext_inp: Number of external input.
* @numcidc: Number of contextID comparators.
* @numvmidc: Number of VMID comparators.
* @nrseqstate: The number of sequencer states that are implemented.
* @nr_event: Indicates how many events the trace unit support.
* @nr_resource:The number of resource selection pairs available for tracing.
* @nr_ss_cmp: Number of single-shot comparator controls that are available.
* @mode: Controls various modes supported by this ETM.
* @trcid: value of the current ID for this component.
* @trcid_size: Indicates the trace ID width.
* @instrp0: Tracing of load and store instructions
* as P0 elements is supported.
* @trccond: If the trace unit supports conditional
* instruction tracing.
* @retstack: Indicates if the implementation supports a return stack.
* @trc_error: Whether a trace unit can trace a system
* error exception.
* @atbtrig: If the implementation can support ATB triggers
* @lpoverride: If the implementation can support low-power state over.
* @pe_sel: Controls which PE to trace.
* @cfg: Controls the tracing options.
* @eventctrl0: Controls the tracing of arbitrary events.
* @eventctrl1: Controls the behavior of the events that @event_ctrl0 selects.
* @stallctl: If functionality that prevents trace unit buffer overflows
* is available.
* @sysstall: Does the system support stall control of the PE?
* @nooverflow: Indicate if overflow prevention is supported.
* @stall_ctrl: Enables trace unit functionality that prevents trace
* unit buffer overflows.
* @ts_size: Global timestamp size field.
* @ts_ctrl: Controls the insertion of global timestamps in the
* trace streams.
* @syncpr: Indicates if an implementation has a fixed
* synchronization period.
* @syncfreq: Controls how often trace synchronization requests occur.
* @trccci: Indicates if the trace unit supports cycle counting
* for instruction.
* @ccsize: Indicates the size of the cycle counter in bits.
* @ccitmin: minimum value that can be programmed in
* the TRCCCCTLR register.
* @ccctlr: Sets the threshold value for cycle counting.
* @trcbb: Indicates if the trace unit supports branch broadcast tracing.
* @q_support: Q element support characteristics.
* @vinst_ctrl: Controls instruction trace filtering.
* @viiectlr: Set or read, the address range comparators.
* @vissctlr: Set, or read, the single address comparators that control the
* ViewInst start-stop logic.
* @vipcssctlr: Set, or read, which PE comparator inputs can control the
* ViewInst start-stop logic.
* @seq_idx: Sequencor index selector.
* @seq_ctrl: Control for the sequencer state transition control register.
* @seq_rst: Moves the sequencer to state 0 when a programmed event occurs.
* @seq_state: Set, or read the sequencer state.
* @cntr_idx: Counter index seletor.
* @cntrldvr: Sets or returns the reload count value for a counter.
* @cntr_ctrl: Controls the operation of a counter.
* @cntr_val: Sets or returns the value for a counter.
* @res_idx: Resource index selector.
* @res_ctrl: Controls the selection of the resources in the trace unit.
* @ss_ctrl: Controls the corresponding single-shot comparator resource.
* @ss_status: The status of the corresponding single-shot comparator.
* @ss_pe_cmp: Selects the PE comparator inputs for Single-shot control.
* @addr_idx: Address comparator index selector.
* @addr_val: Value for address comparator.
* @addr_acc: Address comparator access type.
* @addr_type: Current status of the comparator register.
* @ctxid_idx: Context ID index selector.
* @ctxid_size: Size of the context ID field to consider.
* @ctxid_val: Value of the context ID comparator.
* @ctxid_mask0:Context ID comparator mask for comparator 0-3.
* @ctxid_mask1:Context ID comparator mask for comparator 4-7.
* @vmid_idx: VM ID index selector.
* @vmid_size: Size of the VM ID comparator to consider.
* @vmid_val: Value of the VM ID comparator.
* @vmid_mask0: VM ID comparator mask for comparator 0-3.
* @vmid_mask1: VM ID comparator mask for comparator 4-7.
* @s_ex_level: In secure state, indicates whether instruction tracing is
* supported for the corresponding Exception level.
* @ns_ex_level:In non-secure state, indicates whether instruction tracing is
* supported for the corresponding Exception level.
* @ext_inp: External input selection.
*/
struct etmv4_drvdata {
void __iomem *base;
struct device *dev;
struct coresight_device *csdev;
spinlock_t spinlock;
int cpu;
u8 arch;
bool enable;
bool sticky_enable;
bool boot_enable;
bool os_unlock;
u8 nr_pe;
u8 nr_pe_cmp;
u8 nr_addr_cmp;
u8 nr_cntr;
u8 nr_ext_inp;
u8 numcidc;
u8 numvmidc;
u8 nrseqstate;
u8 nr_event;
u8 nr_resource;
u8 nr_ss_cmp;
u32 mode;
u8 trcid;
u8 trcid_size;
bool instrp0;
bool trccond;
bool retstack;
bool trc_error;
bool atbtrig;
bool lpoverride;
u32 pe_sel;
u32 cfg;
u32 eventctrl0;
u32 eventctrl1;
bool stallctl;
bool sysstall;
bool nooverflow;
u32 stall_ctrl;
u8 ts_size;
u32 ts_ctrl;
bool syncpr;
u32 syncfreq;
bool trccci;
u8 ccsize;
u8 ccitmin;
u32 ccctlr;
bool trcbb;
u32 bb_ctrl;
bool q_support;
u32 vinst_ctrl;
u32 viiectlr;
u32 vissctlr;
u32 vipcssctlr;
u8 seq_idx;
u32 seq_ctrl[ETM_MAX_SEQ_STATES];
u32 seq_rst;
u32 seq_state;
u8 cntr_idx;
u32 cntrldvr[ETMv4_MAX_CNTR];
u32 cntr_ctrl[ETMv4_MAX_CNTR];
u32 cntr_val[ETMv4_MAX_CNTR];
u8 res_idx;
u32 res_ctrl[ETM_MAX_RES_SEL];
u32 ss_ctrl[ETM_MAX_SS_CMP];
u32 ss_status[ETM_MAX_SS_CMP];
u32 ss_pe_cmp[ETM_MAX_SS_CMP];
u8 addr_idx;
u64 addr_val[ETM_MAX_SINGLE_ADDR_CMP];
u64 addr_acc[ETM_MAX_SINGLE_ADDR_CMP];
u8 addr_type[ETM_MAX_SINGLE_ADDR_CMP];
u8 ctxid_idx;
u8 ctxid_size;
u64 ctxid_val[ETMv4_MAX_CTXID_CMP];
u32 ctxid_mask0;
u32 ctxid_mask1;
u8 vmid_idx;
u8 vmid_size;
u64 vmid_val[ETM_MAX_VMID_CMP];
u32 vmid_mask0;
u32 vmid_mask1;
u8 s_ex_level;
u8 ns_ex_level;
u32 ext_inp;
};
/* Address comparator access types */
enum etm_addr_acctype {
ETM_INSTR_ADDR,
ETM_DATA_LOAD_ADDR,
ETM_DATA_STORE_ADDR,
ETM_DATA_LOAD_STORE_ADDR,
};
/* Address comparator context types */
enum etm_addr_ctxtype {
ETM_CTX_NONE,
ETM_CTX_CTXID,
ETM_CTX_VMID,
ETM_CTX_CTXID_VMID,
};
enum etm_addr_type {
ETM_ADDR_TYPE_NONE,
ETM_ADDR_TYPE_SINGLE,
ETM_ADDR_TYPE_RANGE,
ETM_ADDR_TYPE_START,
ETM_ADDR_TYPE_STOP,
};
#endif