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WSL2-Linux-Kernel/drivers/hwtracing/coresight/coresight-etm3x-core.c

1028 строки
25 KiB
C
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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2011-2012, The Linux Foundation. All rights reserved.
*
* Description: CoreSight Program Flow Trace driver
*/
#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/pm_runtime.h>
#include <linux/cpu.h>
#include <linux/of.h>
#include <linux/coresight.h>
#include <linux/coresight-pmu.h>
#include <linux/amba/bus.h>
#include <linux/seq_file.h>
#include <linux/uaccess.h>
#include <linux/clk.h>
#include <linux/perf_event.h>
#include <asm/sections.h>
#include "coresight-etm.h"
#include "coresight-etm-perf.h"
/*
* Not really modular but using module_param is the easiest way to
* remain consistent with existing use cases for now.
*/
static int boot_enable;
module_param_named(boot_enable, boot_enable, int, S_IRUGO);
static struct etm_drvdata *etmdrvdata[NR_CPUS];
static enum cpuhp_state hp_online;
/*
* Memory mapped writes to clear os lock are not supported on some processors
* and OS lock must be unlocked before any memory mapped access on such
* processors, otherwise memory mapped reads/writes will be invalid.
*/
static void etm_os_unlock(struct etm_drvdata *drvdata)
{
/* Writing any value to ETMOSLAR unlocks the trace registers */
etm_writel(drvdata, 0x0, ETMOSLAR);
drvdata->os_unlock = true;
isb();
}
static void etm_set_pwrdwn(struct etm_drvdata *drvdata)
{
u32 etmcr;
/* Ensure pending cp14 accesses complete before setting pwrdwn */
mb();
isb();
etmcr = etm_readl(drvdata, ETMCR);
etmcr |= ETMCR_PWD_DWN;
etm_writel(drvdata, etmcr, ETMCR);
}
static void etm_clr_pwrdwn(struct etm_drvdata *drvdata)
{
u32 etmcr;
etmcr = etm_readl(drvdata, ETMCR);
etmcr &= ~ETMCR_PWD_DWN;
etm_writel(drvdata, etmcr, ETMCR);
/* Ensure pwrup completes before subsequent cp14 accesses */
mb();
isb();
}
static void etm_set_pwrup(struct etm_drvdata *drvdata)
{
u32 etmpdcr;
etmpdcr = readl_relaxed(drvdata->base + ETMPDCR);
etmpdcr |= ETMPDCR_PWD_UP;
writel_relaxed(etmpdcr, drvdata->base + ETMPDCR);
/* Ensure pwrup completes before subsequent cp14 accesses */
mb();
isb();
}
static void etm_clr_pwrup(struct etm_drvdata *drvdata)
{
u32 etmpdcr;
/* Ensure pending cp14 accesses complete before clearing pwrup */
mb();
isb();
etmpdcr = readl_relaxed(drvdata->base + ETMPDCR);
etmpdcr &= ~ETMPDCR_PWD_UP;
writel_relaxed(etmpdcr, drvdata->base + ETMPDCR);
}
/**
* coresight_timeout_etm - loop until a bit has changed to a specific state.
* @drvdata: etm's private data structure.
* @offset: address of a register, starting from @addr.
* @position: the position of the bit of interest.
* @value: the value the bit should have.
*
* Basically the same as @coresight_timeout except for the register access
* method where we have to account for CP14 configurations.
* Return: 0 as soon as the bit has taken the desired state or -EAGAIN if
* TIMEOUT_US has elapsed, which ever happens first.
*/
static int coresight_timeout_etm(struct etm_drvdata *drvdata, u32 offset,
int position, int value)
{
int i;
u32 val;
for (i = TIMEOUT_US; i > 0; i--) {
val = etm_readl(drvdata, offset);
/* Waiting on the bit to go from 0 to 1 */
if (value) {
if (val & BIT(position))
return 0;
/* Waiting on the bit to go from 1 to 0 */
} else {
if (!(val & BIT(position)))
return 0;
}
/*
* Delay is arbitrary - the specification doesn't say how long
* we are expected to wait. Extra check required to make sure
* we don't wait needlessly on the last iteration.
*/
if (i - 1)
udelay(1);
}
return -EAGAIN;
}
static void etm_set_prog(struct etm_drvdata *drvdata)
{
u32 etmcr;
etmcr = etm_readl(drvdata, ETMCR);
etmcr |= ETMCR_ETM_PRG;
etm_writel(drvdata, etmcr, ETMCR);
/*
* Recommended by spec for cp14 accesses to ensure etmcr write is
* complete before polling etmsr
*/
isb();
if (coresight_timeout_etm(drvdata, ETMSR, ETMSR_PROG_BIT, 1)) {
dev_err(&drvdata->csdev->dev,
"%s: timeout observed when probing at offset %#x\n",
__func__, ETMSR);
}
}
static void etm_clr_prog(struct etm_drvdata *drvdata)
{
u32 etmcr;
etmcr = etm_readl(drvdata, ETMCR);
etmcr &= ~ETMCR_ETM_PRG;
etm_writel(drvdata, etmcr, ETMCR);
/*
* Recommended by spec for cp14 accesses to ensure etmcr write is
* complete before polling etmsr
*/
isb();
if (coresight_timeout_etm(drvdata, ETMSR, ETMSR_PROG_BIT, 0)) {
dev_err(&drvdata->csdev->dev,
"%s: timeout observed when probing at offset %#x\n",
__func__, ETMSR);
}
}
void etm_set_default(struct etm_config *config)
{
int i;
if (WARN_ON_ONCE(!config))
return;
/*
* Taken verbatim from the TRM:
*
* To trace all memory:
* set bit [24] in register 0x009, the ETMTECR1, to 1
* set all other bits in register 0x009, the ETMTECR1, to 0
* set all bits in register 0x007, the ETMTECR2, to 0
* set register 0x008, the ETMTEEVR, to 0x6F (TRUE).
*/
config->enable_ctrl1 = BIT(24);
config->enable_ctrl2 = 0x0;
config->enable_event = ETM_HARD_WIRE_RES_A;
config->trigger_event = ETM_DEFAULT_EVENT_VAL;
config->enable_event = ETM_HARD_WIRE_RES_A;
config->seq_12_event = ETM_DEFAULT_EVENT_VAL;
config->seq_21_event = ETM_DEFAULT_EVENT_VAL;
config->seq_23_event = ETM_DEFAULT_EVENT_VAL;
config->seq_31_event = ETM_DEFAULT_EVENT_VAL;
config->seq_32_event = ETM_DEFAULT_EVENT_VAL;
config->seq_13_event = ETM_DEFAULT_EVENT_VAL;
config->timestamp_event = ETM_DEFAULT_EVENT_VAL;
for (i = 0; i < ETM_MAX_CNTR; i++) {
config->cntr_rld_val[i] = 0x0;
config->cntr_event[i] = ETM_DEFAULT_EVENT_VAL;
config->cntr_rld_event[i] = ETM_DEFAULT_EVENT_VAL;
config->cntr_val[i] = 0x0;
}
config->seq_curr_state = 0x0;
config->ctxid_idx = 0x0;
for (i = 0; i < ETM_MAX_CTXID_CMP; i++)
config->ctxid_pid[i] = 0x0;
config->ctxid_mask = 0x0;
/* Setting default to 1024 as per TRM recommendation */
config->sync_freq = 0x400;
}
void etm_config_trace_mode(struct etm_config *config)
{
u32 flags, mode;
mode = config->mode;
mode &= (ETM_MODE_EXCL_KERN | ETM_MODE_EXCL_USER);
/* excluding kernel AND user space doesn't make sense */
if (mode == (ETM_MODE_EXCL_KERN | ETM_MODE_EXCL_USER))
return;
/* nothing to do if neither flags are set */
if (!(mode & ETM_MODE_EXCL_KERN) && !(mode & ETM_MODE_EXCL_USER))
return;
flags = (1 << 0 | /* instruction execute */
3 << 3 | /* ARM instruction */
0 << 5 | /* No data value comparison */
0 << 7 | /* No exact mach */
0 << 8); /* Ignore context ID */
/* No need to worry about single address comparators. */
config->enable_ctrl2 = 0x0;
/* Bit 0 is address range comparator 1 */
config->enable_ctrl1 = ETMTECR1_ADDR_COMP_1;
/*
* On ETMv3.5:
* ETMACTRn[13,11] == Non-secure state comparison control
* ETMACTRn[12,10] == Secure state comparison control
*
* b00 == Match in all modes in this state
* b01 == Do not match in any more in this state
* b10 == Match in all modes excepts user mode in this state
* b11 == Match only in user mode in this state
*/
/* Tracing in secure mode is not supported at this time */
flags |= (0 << 12 | 1 << 10);
if (mode & ETM_MODE_EXCL_USER) {
/* exclude user, match all modes except user mode */
flags |= (1 << 13 | 0 << 11);
} else {
/* exclude kernel, match only in user mode */
flags |= (1 << 13 | 1 << 11);
}
/*
* The ETMEEVR register is already set to "hard wire A". As such
* all there is to do is setup an address comparator that spans
* the entire address range and configure the state and mode bits.
*/
config->addr_val[0] = (u32) 0x0;
config->addr_val[1] = (u32) ~0x0;
config->addr_acctype[0] = flags;
config->addr_acctype[1] = flags;
config->addr_type[0] = ETM_ADDR_TYPE_RANGE;
config->addr_type[1] = ETM_ADDR_TYPE_RANGE;
}
#define ETM3X_SUPPORTED_OPTIONS (ETMCR_CYC_ACC | \
ETMCR_TIMESTAMP_EN | \
ETMCR_RETURN_STACK)
static int etm_parse_event_config(struct etm_drvdata *drvdata,
struct perf_event *event)
{
struct etm_config *config = &drvdata->config;
struct perf_event_attr *attr = &event->attr;
if (!attr)
return -EINVAL;
/* Clear configuration from previous run */
memset(config, 0, sizeof(struct etm_config));
if (attr->exclude_kernel)
config->mode = ETM_MODE_EXCL_KERN;
if (attr->exclude_user)
config->mode = ETM_MODE_EXCL_USER;
/* Always start from the default config */
etm_set_default(config);
/*
* By default the tracers are configured to trace the whole address
* range. Narrow the field only if requested by user space.
*/
if (config->mode)
etm_config_trace_mode(config);
/*
* At this time only cycle accurate, return stack and timestamp
* options are available.
*/
if (attr->config & ~ETM3X_SUPPORTED_OPTIONS)
return -EINVAL;
config->ctrl = attr->config;
/*
* Possible to have cores with PTM (supports ret stack) and ETM
* (never has ret stack) on the same SoC. So if we have a request
* for return stack that can't be honoured on this core then
* clear the bit - trace will still continue normally
*/
if ((config->ctrl & ETMCR_RETURN_STACK) &&
!(drvdata->etmccer & ETMCCER_RETSTACK))
config->ctrl &= ~ETMCR_RETURN_STACK;
return 0;
}
static int etm_enable_hw(struct etm_drvdata *drvdata)
{
int i, rc;
u32 etmcr;
struct etm_config *config = &drvdata->config;
struct coresight_device *csdev = drvdata->csdev;
CS_UNLOCK(drvdata->base);
rc = coresight_claim_device_unlocked(csdev);
if (rc)
goto done;
/* Turn engine on */
etm_clr_pwrdwn(drvdata);
/* Apply power to trace registers */
etm_set_pwrup(drvdata);
/* Make sure all registers are accessible */
etm_os_unlock(drvdata);
etm_set_prog(drvdata);
etmcr = etm_readl(drvdata, ETMCR);
/* Clear setting from a previous run if need be */
etmcr &= ~ETM3X_SUPPORTED_OPTIONS;
etmcr |= drvdata->port_size;
etmcr |= ETMCR_ETM_EN;
etm_writel(drvdata, config->ctrl | etmcr, ETMCR);
etm_writel(drvdata, config->trigger_event, ETMTRIGGER);
etm_writel(drvdata, config->startstop_ctrl, ETMTSSCR);
etm_writel(drvdata, config->enable_event, ETMTEEVR);
etm_writel(drvdata, config->enable_ctrl1, ETMTECR1);
etm_writel(drvdata, config->fifofull_level, ETMFFLR);
for (i = 0; i < drvdata->nr_addr_cmp; i++) {
etm_writel(drvdata, config->addr_val[i], ETMACVRn(i));
etm_writel(drvdata, config->addr_acctype[i], ETMACTRn(i));
}
for (i = 0; i < drvdata->nr_cntr; i++) {
etm_writel(drvdata, config->cntr_rld_val[i], ETMCNTRLDVRn(i));
etm_writel(drvdata, config->cntr_event[i], ETMCNTENRn(i));
etm_writel(drvdata, config->cntr_rld_event[i],
ETMCNTRLDEVRn(i));
etm_writel(drvdata, config->cntr_val[i], ETMCNTVRn(i));
}
etm_writel(drvdata, config->seq_12_event, ETMSQ12EVR);
etm_writel(drvdata, config->seq_21_event, ETMSQ21EVR);
etm_writel(drvdata, config->seq_23_event, ETMSQ23EVR);
etm_writel(drvdata, config->seq_31_event, ETMSQ31EVR);
etm_writel(drvdata, config->seq_32_event, ETMSQ32EVR);
etm_writel(drvdata, config->seq_13_event, ETMSQ13EVR);
etm_writel(drvdata, config->seq_curr_state, ETMSQR);
for (i = 0; i < drvdata->nr_ext_out; i++)
etm_writel(drvdata, ETM_DEFAULT_EVENT_VAL, ETMEXTOUTEVRn(i));
for (i = 0; i < drvdata->nr_ctxid_cmp; i++)
etm_writel(drvdata, config->ctxid_pid[i], ETMCIDCVRn(i));
etm_writel(drvdata, config->ctxid_mask, ETMCIDCMR);
etm_writel(drvdata, config->sync_freq, ETMSYNCFR);
/* No external input selected */
etm_writel(drvdata, 0x0, ETMEXTINSELR);
etm_writel(drvdata, config->timestamp_event, ETMTSEVR);
/* No auxiliary control selected */
etm_writel(drvdata, 0x0, ETMAUXCR);
etm_writel(drvdata, drvdata->traceid, ETMTRACEIDR);
/* No VMID comparator value selected */
etm_writel(drvdata, 0x0, ETMVMIDCVR);
etm_clr_prog(drvdata);
done:
CS_LOCK(drvdata->base);
dev_dbg(&drvdata->csdev->dev, "cpu: %d enable smp call done: %d\n",
drvdata->cpu, rc);
return rc;
}
struct etm_enable_arg {
struct etm_drvdata *drvdata;
int rc;
};
static void etm_enable_hw_smp_call(void *info)
{
struct etm_enable_arg *arg = info;
if (WARN_ON(!arg))
return;
arg->rc = etm_enable_hw(arg->drvdata);
}
static int etm_cpu_id(struct coresight_device *csdev)
{
struct etm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
return drvdata->cpu;
}
int etm_get_trace_id(struct etm_drvdata *drvdata)
{
unsigned long flags;
int trace_id = -1;
struct device *etm_dev;
if (!drvdata)
goto out;
etm_dev = drvdata->csdev->dev.parent;
if (!local_read(&drvdata->mode))
return drvdata->traceid;
pm_runtime_get_sync(etm_dev);
spin_lock_irqsave(&drvdata->spinlock, flags);
CS_UNLOCK(drvdata->base);
trace_id = (etm_readl(drvdata, ETMTRACEIDR) & ETM_TRACEID_MASK);
CS_LOCK(drvdata->base);
spin_unlock_irqrestore(&drvdata->spinlock, flags);
pm_runtime_put(etm_dev);
out:
return trace_id;
}
static int etm_trace_id(struct coresight_device *csdev)
{
struct etm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
return etm_get_trace_id(drvdata);
}
static int etm_enable_perf(struct coresight_device *csdev,
struct perf_event *event)
{
struct etm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
if (WARN_ON_ONCE(drvdata->cpu != smp_processor_id()))
return -EINVAL;
/* Configure the tracer based on the session's specifics */
etm_parse_event_config(drvdata, event);
/* And enable it */
return etm_enable_hw(drvdata);
}
static int etm_enable_sysfs(struct coresight_device *csdev)
{
struct etm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
struct etm_enable_arg arg = { };
int ret;
spin_lock(&drvdata->spinlock);
/*
* Configure the ETM only if the CPU is online. If it isn't online
* hw configuration will take place on the local CPU during bring up.
*/
if (cpu_online(drvdata->cpu)) {
arg.drvdata = drvdata;
ret = smp_call_function_single(drvdata->cpu,
etm_enable_hw_smp_call, &arg, 1);
if (!ret)
ret = arg.rc;
if (!ret)
drvdata->sticky_enable = true;
} else {
ret = -ENODEV;
}
spin_unlock(&drvdata->spinlock);
if (!ret)
dev_dbg(&csdev->dev, "ETM tracing enabled\n");
return ret;
}
static int etm_enable(struct coresight_device *csdev,
struct perf_event *event, u32 mode)
{
int ret;
u32 val;
struct etm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
val = local_cmpxchg(&drvdata->mode, CS_MODE_DISABLED, mode);
/* Someone is already using the tracer */
if (val)
return -EBUSY;
switch (mode) {
case CS_MODE_SYSFS:
ret = etm_enable_sysfs(csdev);
break;
case CS_MODE_PERF:
ret = etm_enable_perf(csdev, event);
break;
default:
ret = -EINVAL;
}
/* The tracer didn't start */
if (ret)
local_set(&drvdata->mode, CS_MODE_DISABLED);
return ret;
}
static void etm_disable_hw(void *info)
{
int i;
struct etm_drvdata *drvdata = info;
struct etm_config *config = &drvdata->config;
struct coresight_device *csdev = drvdata->csdev;
CS_UNLOCK(drvdata->base);
etm_set_prog(drvdata);
/* Read back sequencer and counters for post trace analysis */
config->seq_curr_state = (etm_readl(drvdata, ETMSQR) & ETM_SQR_MASK);
for (i = 0; i < drvdata->nr_cntr; i++)
config->cntr_val[i] = etm_readl(drvdata, ETMCNTVRn(i));
etm_set_pwrdwn(drvdata);
coresight_disclaim_device_unlocked(csdev);
CS_LOCK(drvdata->base);
dev_dbg(&drvdata->csdev->dev,
"cpu: %d disable smp call done\n", drvdata->cpu);
}
static void etm_disable_perf(struct coresight_device *csdev)
{
struct etm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
if (WARN_ON_ONCE(drvdata->cpu != smp_processor_id()))
return;
CS_UNLOCK(drvdata->base);
/* Setting the prog bit disables tracing immediately */
etm_set_prog(drvdata);
/*
* There is no way to know when the tracer will be used again so
* power down the tracer.
*/
etm_set_pwrdwn(drvdata);
coresight_disclaim_device_unlocked(csdev);
CS_LOCK(drvdata->base);
}
static void etm_disable_sysfs(struct coresight_device *csdev)
{
struct etm_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.
*/
cpus_read_lock();
spin_lock(&drvdata->spinlock);
/*
* Executing etm_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, etm_disable_hw, drvdata, 1);
spin_unlock(&drvdata->spinlock);
cpus_read_unlock();
dev_dbg(&csdev->dev, "ETM tracing disabled\n");
}
static void etm_disable(struct coresight_device *csdev,
struct perf_event *event)
{
u32 mode;
struct etm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
/*
* For as long as the tracer isn't disabled another entity can't
* change its status. As such we can read the status here without
* fearing it will change under us.
*/
mode = local_read(&drvdata->mode);
switch (mode) {
case CS_MODE_DISABLED:
break;
case CS_MODE_SYSFS:
etm_disable_sysfs(csdev);
break;
case CS_MODE_PERF:
etm_disable_perf(csdev);
break;
default:
WARN_ON_ONCE(mode);
return;
}
if (mode)
local_set(&drvdata->mode, CS_MODE_DISABLED);
}
static const struct coresight_ops_source etm_source_ops = {
.cpu_id = etm_cpu_id,
.trace_id = etm_trace_id,
.enable = etm_enable,
.disable = etm_disable,
};
static const struct coresight_ops etm_cs_ops = {
.source_ops = &etm_source_ops,
};
static int etm_online_cpu(unsigned int cpu)
{
if (!etmdrvdata[cpu])
return 0;
if (etmdrvdata[cpu]->boot_enable && !etmdrvdata[cpu]->sticky_enable)
coresight_enable(etmdrvdata[cpu]->csdev);
return 0;
}
static int etm_starting_cpu(unsigned int cpu)
{
if (!etmdrvdata[cpu])
return 0;
spin_lock(&etmdrvdata[cpu]->spinlock);
if (!etmdrvdata[cpu]->os_unlock) {
etm_os_unlock(etmdrvdata[cpu]);
etmdrvdata[cpu]->os_unlock = true;
}
if (local_read(&etmdrvdata[cpu]->mode))
etm_enable_hw(etmdrvdata[cpu]);
spin_unlock(&etmdrvdata[cpu]->spinlock);
return 0;
}
static int etm_dying_cpu(unsigned int cpu)
{
if (!etmdrvdata[cpu])
return 0;
spin_lock(&etmdrvdata[cpu]->spinlock);
if (local_read(&etmdrvdata[cpu]->mode))
etm_disable_hw(etmdrvdata[cpu]);
spin_unlock(&etmdrvdata[cpu]->spinlock);
return 0;
}
static bool etm_arch_supported(u8 arch)
{
switch (arch) {
case ETM_ARCH_V3_3:
break;
case ETM_ARCH_V3_5:
break;
case PFT_ARCH_V1_0:
break;
case PFT_ARCH_V1_1:
break;
default:
return false;
}
return true;
}
static void etm_init_arch_data(void *info)
{
u32 etmidr;
u32 etmccr;
struct etm_drvdata *drvdata = info;
/* Make sure all registers are accessible */
etm_os_unlock(drvdata);
CS_UNLOCK(drvdata->base);
/* First dummy read */
(void)etm_readl(drvdata, ETMPDSR);
/* Provide power to ETM: ETMPDCR[3] == 1 */
etm_set_pwrup(drvdata);
/*
* Clear power down bit since when this bit is set writes to
* certain registers might be ignored.
*/
etm_clr_pwrdwn(drvdata);
/*
* Set prog bit. It will be set from reset but this is included to
* ensure it is set
*/
etm_set_prog(drvdata);
/* Find all capabilities */
etmidr = etm_readl(drvdata, ETMIDR);
drvdata->arch = BMVAL(etmidr, 4, 11);
drvdata->port_size = etm_readl(drvdata, ETMCR) & PORT_SIZE_MASK;
drvdata->etmccer = etm_readl(drvdata, ETMCCER);
etmccr = etm_readl(drvdata, ETMCCR);
drvdata->etmccr = etmccr;
drvdata->nr_addr_cmp = BMVAL(etmccr, 0, 3) * 2;
drvdata->nr_cntr = BMVAL(etmccr, 13, 15);
drvdata->nr_ext_inp = BMVAL(etmccr, 17, 19);
drvdata->nr_ext_out = BMVAL(etmccr, 20, 22);
drvdata->nr_ctxid_cmp = BMVAL(etmccr, 24, 25);
etm_set_pwrdwn(drvdata);
etm_clr_pwrup(drvdata);
CS_LOCK(drvdata->base);
}
static void etm_init_trace_id(struct etm_drvdata *drvdata)
{
drvdata->traceid = coresight_get_trace_id(drvdata->cpu);
}
static int __init etm_hp_setup(void)
{
int ret;
ret = cpuhp_setup_state_nocalls_cpuslocked(CPUHP_AP_ARM_CORESIGHT_STARTING,
"arm/coresight:starting",
etm_starting_cpu, etm_dying_cpu);
if (ret)
return ret;
ret = cpuhp_setup_state_nocalls_cpuslocked(CPUHP_AP_ONLINE_DYN,
"arm/coresight:online",
etm_online_cpu, NULL);
/* HP dyn state ID returned in ret on success */
if (ret > 0) {
hp_online = ret;
return 0;
}
/* failed dyn state - remove others */
cpuhp_remove_state_nocalls(CPUHP_AP_ARM_CORESIGHT_STARTING);
return ret;
}
static void etm_hp_clear(void)
{
cpuhp_remove_state_nocalls(CPUHP_AP_ARM_CORESIGHT_STARTING);
if (hp_online) {
cpuhp_remove_state_nocalls(hp_online);
hp_online = 0;
}
}
static int etm_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 etm_drvdata *drvdata;
struct resource *res = &adev->res;
struct coresight_desc desc = { 0 };
drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
if (!drvdata)
return -ENOMEM;
drvdata->use_cp14 = fwnode_property_read_bool(dev->fwnode, "arm,cp14");
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;
desc.access = CSDEV_ACCESS_IOMEM(base);
spin_lock_init(&drvdata->spinlock);
drvdata->atclk = devm_clk_get(&adev->dev, "atclk"); /* optional */
if (!IS_ERR(drvdata->atclk)) {
ret = clk_prepare_enable(drvdata->atclk);
if (ret)
return ret;
}
drvdata->cpu = coresight_get_cpu(dev);
if (drvdata->cpu < 0)
return drvdata->cpu;
desc.name = devm_kasprintf(dev, GFP_KERNEL, "etm%d", drvdata->cpu);
if (!desc.name)
return -ENOMEM;
if (smp_call_function_single(drvdata->cpu,
etm_init_arch_data, drvdata, 1))
dev_err(dev, "ETM arch init failed\n");
if (etm_arch_supported(drvdata->arch) == false)
return -EINVAL;
etm_init_trace_id(drvdata);
etm_set_default(&drvdata->config);
pdata = coresight_get_platform_data(dev);
if (IS_ERR(pdata))
return PTR_ERR(pdata);
adev->dev.platform_data = pdata;
desc.type = CORESIGHT_DEV_TYPE_SOURCE;
desc.subtype.source_subtype = CORESIGHT_DEV_SUBTYPE_SOURCE_PROC;
desc.ops = &etm_cs_ops;
desc.pdata = pdata;
desc.dev = dev;
desc.groups = coresight_etm_groups;
drvdata->csdev = coresight_register(&desc);
if (IS_ERR(drvdata->csdev))
return PTR_ERR(drvdata->csdev);
ret = etm_perf_symlink(drvdata->csdev, true);
if (ret) {
coresight_unregister(drvdata->csdev);
return ret;
}
etmdrvdata[drvdata->cpu] = drvdata;
pm_runtime_put(&adev->dev);
dev_info(&drvdata->csdev->dev,
"%s initialized\n", (char *)coresight_get_uci_data(id));
if (boot_enable) {
coresight_enable(drvdata->csdev);
drvdata->boot_enable = true;
}
return 0;
}
static void clear_etmdrvdata(void *info)
{
int cpu = *(int *)info;
etmdrvdata[cpu] = NULL;
}
static void etm_remove(struct amba_device *adev)
{
struct etm_drvdata *drvdata = dev_get_drvdata(&adev->dev);
etm_perf_symlink(drvdata->csdev, false);
/*
* Taking hotplug lock here to avoid racing between etm_remove and
* CPU hotplug call backs.
*/
cpus_read_lock();
/*
* The readers for etmdrvdata[] are CPU hotplug call backs
* and PM notification call backs. Change etmdrvdata[i] on
* CPU i ensures these call backs has consistent view
* inside one call back function.
*/
if (smp_call_function_single(drvdata->cpu, clear_etmdrvdata, &drvdata->cpu, 1))
etmdrvdata[drvdata->cpu] = NULL;
cpus_read_unlock();
coresight_unregister(drvdata->csdev);
}
#ifdef CONFIG_PM
static int etm_runtime_suspend(struct device *dev)
{
struct etm_drvdata *drvdata = dev_get_drvdata(dev);
if (drvdata && !IS_ERR(drvdata->atclk))
clk_disable_unprepare(drvdata->atclk);
return 0;
}
static int etm_runtime_resume(struct device *dev)
{
struct etm_drvdata *drvdata = dev_get_drvdata(dev);
if (drvdata && !IS_ERR(drvdata->atclk))
clk_prepare_enable(drvdata->atclk);
return 0;
}
#endif
static const struct dev_pm_ops etm_dev_pm_ops = {
SET_RUNTIME_PM_OPS(etm_runtime_suspend, etm_runtime_resume, NULL)
};
static const struct amba_id etm_ids[] = {
/* ETM 3.3 */
CS_AMBA_ID_DATA(0x000bb921, "ETM 3.3"),
/* ETM 3.5 - Cortex-A5 */
CS_AMBA_ID_DATA(0x000bb955, "ETM 3.5"),
/* ETM 3.5 */
CS_AMBA_ID_DATA(0x000bb956, "ETM 3.5"),
/* PTM 1.0 */
CS_AMBA_ID_DATA(0x000bb950, "PTM 1.0"),
/* PTM 1.1 */
CS_AMBA_ID_DATA(0x000bb95f, "PTM 1.1"),
/* PTM 1.1 Qualcomm */
CS_AMBA_ID_DATA(0x000b006f, "PTM 1.1"),
{ 0, 0},
};
MODULE_DEVICE_TABLE(amba, etm_ids);
static struct amba_driver etm_driver = {
.drv = {
.name = "coresight-etm3x",
.owner = THIS_MODULE,
.pm = &etm_dev_pm_ops,
.suppress_bind_attrs = true,
},
.probe = etm_probe,
.remove = etm_remove,
.id_table = etm_ids,
};
static int __init etm_init(void)
{
int ret;
ret = etm_hp_setup();
/* etm_hp_setup() does its own cleanup - exit on error */
if (ret)
return ret;
ret = amba_driver_register(&etm_driver);
if (ret) {
pr_err("Error registering etm3x driver\n");
etm_hp_clear();
}
return ret;
}
static void __exit etm_exit(void)
{
amba_driver_unregister(&etm_driver);
etm_hp_clear();
}
module_init(etm_init);
module_exit(etm_exit);
MODULE_AUTHOR("Pratik Patel <pratikp@codeaurora.org>");
MODULE_AUTHOR("Mathieu Poirier <mathieu.poirier@linaro.org>");
MODULE_DESCRIPTION("Arm CoreSight Program Flow Trace driver");
MODULE_LICENSE("GPL v2");
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