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linux-zen-server/drivers/hwtracing/coresight/coresight-etm4x-core.c

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Initial commit
2023-08-30 17:53:23 +02:00
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2014, The Linux Foundation. All rights reserved.
*/
#include <linux/bitops.h>
#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/cpu_pm.h>
#include <linux/coresight.h>
#include <linux/coresight-pmu.h>
#include <linux/pm_wakeup.h>
#include <linux/amba/bus.h>
#include <linux/seq_file.h>
#include <linux/uaccess.h>
#include <linux/perf_event.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/property.h>
#include <asm/barrier.h>
#include <asm/sections.h>
#include <asm/sysreg.h>
#include <asm/local.h>
#include <asm/virt.h>
#include "coresight-etm4x.h"
#include "coresight-etm-perf.h"
#include "coresight-etm4x-cfg.h"
#include "coresight-self-hosted-trace.h"
#include "coresight-syscfg.h"
#include "coresight-trace-id.h"
static int boot_enable;
module_param(boot_enable, int, 0444);
MODULE_PARM_DESC(boot_enable, "Enable tracing on boot");
#define PARAM_PM_SAVE_FIRMWARE 0 /* save self-hosted state as per firmware */
#define PARAM_PM_SAVE_NEVER 1 /* never save any state */
#define PARAM_PM_SAVE_SELF_HOSTED 2 /* save self-hosted state only */
static int pm_save_enable = PARAM_PM_SAVE_FIRMWARE;
module_param(pm_save_enable, int, 0444);
MODULE_PARM_DESC(pm_save_enable,
"Save/restore state on power down: 1 = never, 2 = self-hosted");
static struct etmv4_drvdata *etmdrvdata[NR_CPUS];
static void etm4_set_default_config(struct etmv4_config *config);
static int etm4_set_event_filters(struct etmv4_drvdata *drvdata,
struct perf_event *event);
static u64 etm4_get_access_type(struct etmv4_config *config);
static enum cpuhp_state hp_online;
struct etm4_init_arg {
unsigned int pid;
struct device *dev;
struct csdev_access *csa;
};
static DEFINE_PER_CPU(struct etm4_init_arg *, delayed_probe);
static int etm4_probe_cpu(unsigned int cpu);
/*
* Check if TRCSSPCICRn(i) is implemented for a given instance.
*
* TRCSSPCICRn is implemented only if :
* TRCSSPCICR<n> is present only if all of the following are true:
* TRCIDR4.NUMSSCC > n.
* TRCIDR4.NUMPC > 0b0000 .
* TRCSSCSR<n>.PC == 0b1
*/
static inline bool etm4x_sspcicrn_present(struct etmv4_drvdata *drvdata, int n)
{
return (n < drvdata->nr_ss_cmp) &&
drvdata->nr_pe &&
(drvdata->config.ss_status[n] & TRCSSCSRn_PC);
}
u64 etm4x_sysreg_read(u32 offset, bool _relaxed, bool _64bit)
{
u64 res = 0;
switch (offset) {
ETM4x_READ_SYSREG_CASES(res)
default :
pr_warn_ratelimited("etm4x: trying to read unsupported register @%x\n",
offset);
}
if (!_relaxed)
__io_ar(res); /* Imitate the !relaxed I/O helpers */
return res;
}
void etm4x_sysreg_write(u64 val, u32 offset, bool _relaxed, bool _64bit)
{
if (!_relaxed)
__io_bw(); /* Imitate the !relaxed I/O helpers */
if (!_64bit)
val &= GENMASK(31, 0);
switch (offset) {
ETM4x_WRITE_SYSREG_CASES(val)
default :
pr_warn_ratelimited("etm4x: trying to write to unsupported register @%x\n",
offset);
}
}
static u64 ete_sysreg_read(u32 offset, bool _relaxed, bool _64bit)
{
u64 res = 0;
switch (offset) {
ETE_READ_CASES(res)
default :
pr_warn_ratelimited("ete: trying to read unsupported register @%x\n",
offset);
}
if (!_relaxed)
__io_ar(res); /* Imitate the !relaxed I/O helpers */
return res;
}
static void ete_sysreg_write(u64 val, u32 offset, bool _relaxed, bool _64bit)
{
if (!_relaxed)
__io_bw(); /* Imitate the !relaxed I/O helpers */
if (!_64bit)
val &= GENMASK(31, 0);
switch (offset) {
ETE_WRITE_CASES(val)
default :
pr_warn_ratelimited("ete: trying to write to unsupported register @%x\n",
offset);
}
}
static void etm_detect_os_lock(struct etmv4_drvdata *drvdata,
struct csdev_access *csa)
{
u32 oslsr = etm4x_relaxed_read32(csa, TRCOSLSR);
drvdata->os_lock_model = ETM_OSLSR_OSLM(oslsr);
}
static void etm_write_os_lock(struct etmv4_drvdata *drvdata,
struct csdev_access *csa, u32 val)
{
val = !!val;
switch (drvdata->os_lock_model) {
case ETM_OSLOCK_PRESENT:
etm4x_relaxed_write32(csa, val, TRCOSLAR);
break;
case ETM_OSLOCK_PE:
write_sysreg_s(val, SYS_OSLAR_EL1);
break;
default:
pr_warn_once("CPU%d: Unsupported Trace OSLock model: %x\n",
smp_processor_id(), drvdata->os_lock_model);
fallthrough;
case ETM_OSLOCK_NI:
return;
}
isb();
}
static inline void etm4_os_unlock_csa(struct etmv4_drvdata *drvdata,
struct csdev_access *csa)
{
WARN_ON(drvdata->cpu != smp_processor_id());
/* Writing 0 to OS Lock unlocks the trace unit registers */
etm_write_os_lock(drvdata, csa, 0x0);
drvdata->os_unlock = true;
}
static void etm4_os_unlock(struct etmv4_drvdata *drvdata)
{
if (!WARN_ON(!drvdata->csdev))
etm4_os_unlock_csa(drvdata, &drvdata->csdev->access);
}
static void etm4_os_lock(struct etmv4_drvdata *drvdata)
{
if (WARN_ON(!drvdata->csdev))
return;
/* Writing 0x1 to OS Lock locks the trace registers */
etm_write_os_lock(drvdata, &drvdata->csdev->access, 0x1);
drvdata->os_unlock = false;
}
static void etm4_cs_lock(struct etmv4_drvdata *drvdata,
struct csdev_access *csa)
{
/* Software Lock is only accessible via memory mapped interface */
if (csa->io_mem)
CS_LOCK(csa->base);
}
static void etm4_cs_unlock(struct etmv4_drvdata *drvdata,
struct csdev_access *csa)
{
if (csa->io_mem)
CS_UNLOCK(csa->base);
}
static int etm4_cpu_id(struct coresight_device *csdev)
{
struct etmv4_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
return drvdata->cpu;
}
int etm4_read_alloc_trace_id(struct etmv4_drvdata *drvdata)
{
int trace_id;
/*
* This will allocate a trace ID to the cpu,
* or return the one currently allocated.
* The trace id function has its own lock
*/
trace_id = coresight_trace_id_get_cpu_id(drvdata->cpu);
if (IS_VALID_CS_TRACE_ID(trace_id))
drvdata->trcid = (u8)trace_id;
else
dev_err(&drvdata->csdev->dev,
"Failed to allocate trace ID for %s on CPU%d\n",
dev_name(&drvdata->csdev->dev), drvdata->cpu);
return trace_id;
}
void etm4_release_trace_id(struct etmv4_drvdata *drvdata)
{
coresight_trace_id_put_cpu_id(drvdata->cpu);
}
struct etm4_enable_arg {
struct etmv4_drvdata *drvdata;
int rc;
};
/*
* etm4x_prohibit_trace - Prohibit the CPU from tracing at all ELs.
* When the CPU supports FEAT_TRF, we could move the ETM to a trace
* prohibited state by filtering the Exception levels via TRFCR_EL1.
*/
static void etm4x_prohibit_trace(struct etmv4_drvdata *drvdata)
{
/* If the CPU doesn't support FEAT_TRF, nothing to do */
if (!drvdata->trfcr)
return;
cpu_prohibit_trace();
}
/*
* etm4x_allow_trace - Allow CPU tracing in the respective ELs,
* as configured by the drvdata->config.mode for the current
* session. Even though we have TRCVICTLR bits to filter the
* trace in the ELs, it doesn't prevent the ETM from generating
* a packet (e.g, TraceInfo) that might contain the addresses from
* the excluded levels. Thus we use the additional controls provided
* via the Trace Filtering controls (FEAT_TRF) to make sure no trace
* is generated for the excluded ELs.
*/
static void etm4x_allow_trace(struct etmv4_drvdata *drvdata)
{
u64 trfcr = drvdata->trfcr;
/* If the CPU doesn't support FEAT_TRF, nothing to do */
if (!trfcr)
return;
if (drvdata->config.mode & ETM_MODE_EXCL_KERN)
trfcr &= ~TRFCR_ELx_ExTRE;
if (drvdata->config.mode & ETM_MODE_EXCL_USER)
trfcr &= ~TRFCR_ELx_E0TRE;
write_trfcr(trfcr);
}
#ifdef CONFIG_ETM4X_IMPDEF_FEATURE
#define HISI_HIP08_AMBA_ID 0x000b6d01
#define ETM4_AMBA_MASK 0xfffff
#define HISI_HIP08_CORE_COMMIT_MASK 0x3000
#define HISI_HIP08_CORE_COMMIT_SHIFT 12
#define HISI_HIP08_CORE_COMMIT_FULL 0b00
#define HISI_HIP08_CORE_COMMIT_LVL_1 0b01
#define HISI_HIP08_CORE_COMMIT_REG sys_reg(3, 1, 15, 2, 5)
struct etm4_arch_features {
void (*arch_callback)(bool enable);
};
static bool etm4_hisi_match_pid(unsigned int id)
{
return (id & ETM4_AMBA_MASK) == HISI_HIP08_AMBA_ID;
}
static void etm4_hisi_config_core_commit(bool enable)
{
u8 commit = enable ? HISI_HIP08_CORE_COMMIT_LVL_1 :
HISI_HIP08_CORE_COMMIT_FULL;
u64 val;
/*
* bit 12 and 13 of HISI_HIP08_CORE_COMMIT_REG are used together
* to set core-commit, 2'b00 means cpu is at full speed, 2'b01,
* 2'b10, 2'b11 mean reduce pipeline speed, and 2'b01 means level-1
* speed(minimun value). So bit 12 and 13 should be cleared together.
*/
val = read_sysreg_s(HISI_HIP08_CORE_COMMIT_REG);
val &= ~HISI_HIP08_CORE_COMMIT_MASK;
val |= commit << HISI_HIP08_CORE_COMMIT_SHIFT;
write_sysreg_s(val, HISI_HIP08_CORE_COMMIT_REG);
}
static struct etm4_arch_features etm4_features[] = {
[ETM4_IMPDEF_HISI_CORE_COMMIT] = {
.arch_callback = etm4_hisi_config_core_commit,
},
{},
};
static void etm4_enable_arch_specific(struct etmv4_drvdata *drvdata)
{
struct etm4_arch_features *ftr;
int bit;
for_each_set_bit(bit, drvdata->arch_features, ETM4_IMPDEF_FEATURE_MAX) {
ftr = &etm4_features[bit];
if (ftr->arch_callback)
ftr->arch_callback(true);
}
}
static void etm4_disable_arch_specific(struct etmv4_drvdata *drvdata)
{
struct etm4_arch_features *ftr;
int bit;
for_each_set_bit(bit, drvdata->arch_features, ETM4_IMPDEF_FEATURE_MAX) {
ftr = &etm4_features[bit];
if (ftr->arch_callback)
ftr->arch_callback(false);
}
}
static void etm4_check_arch_features(struct etmv4_drvdata *drvdata,
unsigned int id)
{
if (etm4_hisi_match_pid(id))
set_bit(ETM4_IMPDEF_HISI_CORE_COMMIT, drvdata->arch_features);
}
#else
static void etm4_enable_arch_specific(struct etmv4_drvdata *drvdata)
{
}
static void etm4_disable_arch_specific(struct etmv4_drvdata *drvdata)
{
}
static void etm4_check_arch_features(struct etmv4_drvdata *drvdata,
unsigned int id)
{
}
#endif /* CONFIG_ETM4X_IMPDEF_FEATURE */
static int etm4_enable_hw(struct etmv4_drvdata *drvdata)
{
int i, rc;
struct etmv4_config *config = &drvdata->config;
struct coresight_device *csdev = drvdata->csdev;
struct device *etm_dev = &csdev->dev;
struct csdev_access *csa = &csdev->access;
etm4_cs_unlock(drvdata, csa);
etm4_enable_arch_specific(drvdata);
etm4_os_unlock(drvdata);
rc = coresight_claim_device_unlocked(csdev);
if (rc)
goto done;
/* Disable the trace unit before programming trace registers */
etm4x_relaxed_write32(csa, 0, TRCPRGCTLR);
/*
* If we use system instructions, we need to synchronize the
* write to the TRCPRGCTLR, before accessing the TRCSTATR.
* See ARM IHI0064F, section
* "4.3.7 Synchronization of register updates"
*/
if (!csa->io_mem)
isb();
/* wait for TRCSTATR.IDLE to go up */
if (coresight_timeout(csa, TRCSTATR, TRCSTATR_IDLE_BIT, 1))
dev_err(etm_dev,
"timeout while waiting for Idle Trace Status\n");
if (drvdata->nr_pe)
etm4x_relaxed_write32(csa, config->pe_sel, TRCPROCSELR);
etm4x_relaxed_write32(csa, config->cfg, TRCCONFIGR);
/* nothing specific implemented */
etm4x_relaxed_write32(csa, 0x0, TRCAUXCTLR);
etm4x_relaxed_write32(csa, config->eventctrl0, TRCEVENTCTL0R);
etm4x_relaxed_write32(csa, config->eventctrl1, TRCEVENTCTL1R);
if (drvdata->stallctl)
etm4x_relaxed_write32(csa, config->stall_ctrl, TRCSTALLCTLR);
etm4x_relaxed_write32(csa, config->ts_ctrl, TRCTSCTLR);
etm4x_relaxed_write32(csa, config->syncfreq, TRCSYNCPR);
etm4x_relaxed_write32(csa, config->ccctlr, TRCCCCTLR);
etm4x_relaxed_write32(csa, config->bb_ctrl, TRCBBCTLR);
etm4x_relaxed_write32(csa, drvdata->trcid, TRCTRACEIDR);
etm4x_relaxed_write32(csa, config->vinst_ctrl, TRCVICTLR);
etm4x_relaxed_write32(csa, config->viiectlr, TRCVIIECTLR);
etm4x_relaxed_write32(csa, config->vissctlr, TRCVISSCTLR);
if (drvdata->nr_pe_cmp)
etm4x_relaxed_write32(csa, config->vipcssctlr, TRCVIPCSSCTLR);
for (i = 0; i < drvdata->nrseqstate - 1; i++)
etm4x_relaxed_write32(csa, config->seq_ctrl[i], TRCSEQEVRn(i));
if (drvdata->nrseqstate) {
etm4x_relaxed_write32(csa, config->seq_rst, TRCSEQRSTEVR);
etm4x_relaxed_write32(csa, config->seq_state, TRCSEQSTR);
}
etm4x_relaxed_write32(csa, config->ext_inp, TRCEXTINSELR);
for (i = 0; i < drvdata->nr_cntr; i++) {
etm4x_relaxed_write32(csa, config->cntrldvr[i], TRCCNTRLDVRn(i));
etm4x_relaxed_write32(csa, config->cntr_ctrl[i], TRCCNTCTLRn(i));
etm4x_relaxed_write32(csa, config->cntr_val[i], TRCCNTVRn(i));
}
/*
* Resource selector pair 0 is always implemented and reserved. As
* such start at 2.
*/
for (i = 2; i < drvdata->nr_resource * 2; i++)
etm4x_relaxed_write32(csa, config->res_ctrl[i], TRCRSCTLRn(i));
for (i = 0; i < drvdata->nr_ss_cmp; i++) {
/* always clear status bit on restart if using single-shot */
if (config->ss_ctrl[i] || config->ss_pe_cmp[i])
config->ss_status[i] &= ~TRCSSCSRn_STATUS;
etm4x_relaxed_write32(csa, config->ss_ctrl[i], TRCSSCCRn(i));
etm4x_relaxed_write32(csa, config->ss_status[i], TRCSSCSRn(i));
if (etm4x_sspcicrn_present(drvdata, i))
etm4x_relaxed_write32(csa, config->ss_pe_cmp[i], TRCSSPCICRn(i));
}
for (i = 0; i < drvdata->nr_addr_cmp * 2; i++) {
etm4x_relaxed_write64(csa, config->addr_val[i], TRCACVRn(i));
etm4x_relaxed_write64(csa, config->addr_acc[i], TRCACATRn(i));
}
for (i = 0; i < drvdata->numcidc; i++)
etm4x_relaxed_write64(csa, config->ctxid_pid[i], TRCCIDCVRn(i));
etm4x_relaxed_write32(csa, config->ctxid_mask0, TRCCIDCCTLR0);
if (drvdata->numcidc > 4)
etm4x_relaxed_write32(csa, config->ctxid_mask1, TRCCIDCCTLR1);
for (i = 0; i < drvdata->numvmidc; i++)
etm4x_relaxed_write64(csa, config->vmid_val[i], TRCVMIDCVRn(i));
etm4x_relaxed_write32(csa, config->vmid_mask0, TRCVMIDCCTLR0);
if (drvdata->numvmidc > 4)
etm4x_relaxed_write32(csa, config->vmid_mask1, TRCVMIDCCTLR1);
if (!drvdata->skip_power_up) {
u32 trcpdcr = etm4x_relaxed_read32(csa, TRCPDCR);
/*
* Request to keep the trace unit powered and also
* emulation of powerdown
*/
etm4x_relaxed_write32(csa, trcpdcr | TRCPDCR_PU, TRCPDCR);
}
/*
* ETE mandates that the TRCRSR is written to before
* enabling it.
*/
if (etm4x_is_ete(drvdata))
etm4x_relaxed_write32(csa, TRCRSR_TA, TRCRSR);
etm4x_allow_trace(drvdata);
/* Enable the trace unit */
etm4x_relaxed_write32(csa, 1, TRCPRGCTLR);
/* Synchronize the register updates for sysreg access */
if (!csa->io_mem)
isb();
/* wait for TRCSTATR.IDLE to go back down to '0' */
if (coresight_timeout(csa, TRCSTATR, TRCSTATR_IDLE_BIT, 0))
dev_err(etm_dev,
"timeout while waiting for Idle Trace Status\n");
/*
* As recommended by section 4.3.7 ("Synchronization when using the
* memory-mapped interface") of ARM IHI 0064D
*/
dsb(sy);
isb();
done:
etm4_cs_lock(drvdata, csa);
dev_dbg(etm_dev, "cpu: %d enable smp call done: %d\n",
drvdata->cpu, rc);
return rc;
}
static void etm4_enable_hw_smp_call(void *info)
{
struct etm4_enable_arg *arg = info;
if (WARN_ON(!arg))
return;
arg->rc = etm4_enable_hw(arg->drvdata);
}
/*
* The goal of function etm4_config_timestamp_event() is to configure a
* counter that will tell the tracer to emit a timestamp packet when it
* reaches zero. This is done in order to get a more fine grained idea
* of when instructions are executed so that they can be correlated
* with execution on other CPUs.
*
* To do this the counter itself is configured to self reload and
* TRCRSCTLR1 (always true) used to get the counter to decrement. From
* there a resource selector is configured with the counter and the
* timestamp control register to use the resource selector to trigger the
* event that will insert a timestamp packet in the stream.
*/
static int etm4_config_timestamp_event(struct etmv4_drvdata *drvdata)
{
int ctridx, ret = -EINVAL;
int counter, rselector;
u32 val = 0;
struct etmv4_config *config = &drvdata->config;
/* No point in trying if we don't have at least one counter */
if (!drvdata->nr_cntr)
goto out;
/* Find a counter that hasn't been initialised */
for (ctridx = 0; ctridx < drvdata->nr_cntr; ctridx++)
if (config->cntr_val[ctridx] == 0)
break;
/* All the counters have been configured already, bail out */
if (ctridx == drvdata->nr_cntr) {
pr_debug("%s: no available counter found\n", __func__);
ret = -ENOSPC;
goto out;
}
/*
* Searching for an available resource selector to use, starting at
* '2' since every implementation has at least 2 resource selector.
* ETMIDR4 gives the number of resource selector _pairs_,
* hence multiply by 2.
*/
for (rselector = 2; rselector < drvdata->nr_resource * 2; rselector++)
if (!config->res_ctrl[rselector])
break;
if (rselector == drvdata->nr_resource * 2) {
pr_debug("%s: no available resource selector found\n",
__func__);
ret = -ENOSPC;
goto out;
}
/* Remember what counter we used */
counter = 1 << ctridx;
/*
* Initialise original and reload counter value to the smallest
* possible value in order to get as much precision as we can.
*/
config->cntr_val[ctridx] = 1;
config->cntrldvr[ctridx] = 1;
/* Set the trace counter control register */
val = 0x1 << 16 | /* Bit 16, reload counter automatically */
0x0 << 7 | /* Select single resource selector */
0x1; /* Resource selector 1, i.e always true */
config->cntr_ctrl[ctridx] = val;
val = 0x2 << 16 | /* Group 0b0010 - Counter and sequencers */
counter << 0; /* Counter to use */
config->res_ctrl[rselector] = val;
val = 0x0 << 7 | /* Select single resource selector */
rselector; /* Resource selector */
config->ts_ctrl = val;
ret = 0;
out:
return ret;
}
static int etm4_parse_event_config(struct coresight_device *csdev,
struct perf_event *event)
{
int ret = 0;
struct etmv4_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
struct etmv4_config *config = &drvdata->config;
struct perf_event_attr *attr = &event->attr;
unsigned long cfg_hash;
int preset;
/* Clear configuration from previous run */
memset(config, 0, sizeof(struct etmv4_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 */
etm4_set_default_config(config);
/* Configure filters specified on the perf cmd line, if any. */
ret = etm4_set_event_filters(drvdata, event);
if (ret)
goto out;
/* Go from generic option to ETMv4 specifics */
if (attr->config & BIT(ETM_OPT_CYCACC)) {
config->cfg |= TRCCONFIGR_CCI;
/* TRM: Must program this for cycacc to work */
config->ccctlr = ETM_CYC_THRESHOLD_DEFAULT;
}
if (attr->config & BIT(ETM_OPT_TS)) {
/*
* Configure timestamps to be emitted at regular intervals in
* order to correlate instructions executed on different CPUs
* (CPU-wide trace scenarios).
*/
ret = etm4_config_timestamp_event(drvdata);
/*
* No need to go further if timestamp intervals can't
* be configured.
*/
if (ret)
goto out;
/* bit[11], Global timestamp tracing bit */
config->cfg |= TRCCONFIGR_TS;
}
/* Only trace contextID when runs in root PID namespace */
if ((attr->config & BIT(ETM_OPT_CTXTID)) &&
task_is_in_init_pid_ns(current))
/* bit[6], Context ID tracing bit */
config->cfg |= TRCCONFIGR_CID;
/*
* If set bit ETM_OPT_CTXTID2 in perf config, this asks to trace VMID
* for recording CONTEXTIDR_EL2. Do not enable VMID tracing if the
* kernel is not running in EL2.
*/
if (attr->config & BIT(ETM_OPT_CTXTID2)) {
if (!is_kernel_in_hyp_mode()) {
ret = -EINVAL;
goto out;
}
/* Only trace virtual contextID when runs in root PID namespace */
if (task_is_in_init_pid_ns(current))
config->cfg |= TRCCONFIGR_VMID | TRCCONFIGR_VMIDOPT;
}
/* return stack - enable if selected and supported */
if ((attr->config & BIT(ETM_OPT_RETSTK)) && drvdata->retstack)
/* bit[12], Return stack enable bit */
config->cfg |= TRCCONFIGR_RS;
/*
* Set any selected configuration and preset.
*
* This extracts the values of PMU_FORMAT_ATTR(configid) and PMU_FORMAT_ATTR(preset)
* in the perf attributes defined in coresight-etm-perf.c.
* configid uses bits 63:32 of attr->config2, preset uses bits 3:0 of attr->config.
* A zero configid means no configuration active, preset = 0 means no preset selected.
*/
if (attr->config2 & GENMASK_ULL(63, 32)) {
cfg_hash = (u32)(attr->config2 >> 32);
preset = attr->config & 0xF;
ret = cscfg_csdev_enable_active_config(csdev, cfg_hash, preset);
}
/* branch broadcast - enable if selected and supported */
if (attr->config & BIT(ETM_OPT_BRANCH_BROADCAST)) {
if (!drvdata->trcbb) {
/*
* Missing BB support could cause silent decode errors
* so fail to open if it's not supported.
*/
ret = -EINVAL;
goto out;
} else {
config->cfg |= BIT(ETM4_CFG_BIT_BB);
}
}
out:
return ret;
}
static int etm4_enable_perf(struct coresight_device *csdev,
struct perf_event *event)
{
int ret = 0, trace_id;
struct etmv4_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
if (WARN_ON_ONCE(drvdata->cpu != smp_processor_id())) {
ret = -EINVAL;
goto out;
}
/* Configure the tracer based on the session's specifics */
ret = etm4_parse_event_config(csdev, event);
if (ret)
goto out;
/*
* perf allocates cpu ids as part of _setup_aux() - device needs to use
* the allocated ID. This reads the current version without allocation.
*
* This does not use the trace id lock to prevent lock_dep issues
* with perf locks - we know the ID cannot change until perf shuts down
* the session
*/
trace_id = coresight_trace_id_read_cpu_id(drvdata->cpu);
if (!IS_VALID_CS_TRACE_ID(trace_id)) {
dev_err(&drvdata->csdev->dev, "Failed to set trace ID for %s on CPU%d\n",
dev_name(&drvdata->csdev->dev), drvdata->cpu);
ret = -EINVAL;
goto out;
}
drvdata->trcid = (u8)trace_id;
/* And enable it */
ret = etm4_enable_hw(drvdata);
out:
return ret;
}
static int etm4_enable_sysfs(struct coresight_device *csdev)
{
struct etmv4_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
struct etm4_enable_arg arg = { };
unsigned long cfg_hash;
int ret, preset;
/* enable any config activated by configfs */
cscfg_config_sysfs_get_active_cfg(&cfg_hash, &preset);
if (cfg_hash) {
ret = cscfg_csdev_enable_active_config(csdev, cfg_hash, preset);
if (ret)
return ret;
}
spin_lock(&drvdata->spinlock);
/* sysfs needs to read and allocate a trace ID */
ret = etm4_read_alloc_trace_id(drvdata);
if (ret < 0)
goto unlock_sysfs_enable;
/*
* Executing etm4_enable_hw on the cpu whose ETM is being enabled
* ensures that register writes occur when cpu is powered.
*/
arg.drvdata = drvdata;
ret = smp_call_function_single(drvdata->cpu,
etm4_enable_hw_smp_call, &arg, 1);
if (!ret)
ret = arg.rc;
if (!ret)
drvdata->sticky_enable = true;
if (ret)
etm4_release_trace_id(drvdata);
unlock_sysfs_enable:
spin_unlock(&drvdata->spinlock);
if (!ret)
dev_dbg(&csdev->dev, "ETM tracing enabled\n");
return ret;
}
static int etm4_enable(struct coresight_device *csdev,
struct perf_event *event, u32 mode)
{
int ret;
u32 val;
struct etmv4_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 = etm4_enable_sysfs(csdev);
break;
case CS_MODE_PERF:
ret = etm4_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 etm4_disable_hw(void *info)
{
u32 control;
struct etmv4_drvdata *drvdata = info;
struct etmv4_config *config = &drvdata->config;
struct coresight_device *csdev = drvdata->csdev;
struct device *etm_dev = &csdev->dev;
struct csdev_access *csa = &csdev->access;
int i;
etm4_cs_unlock(drvdata, csa);
etm4_disable_arch_specific(drvdata);
if (!drvdata->skip_power_up) {
/* power can be removed from the trace unit now */
control = etm4x_relaxed_read32(csa, TRCPDCR);
control &= ~TRCPDCR_PU;
etm4x_relaxed_write32(csa, control, TRCPDCR);
}
control = etm4x_relaxed_read32(csa, TRCPRGCTLR);
/* EN, bit[0] Trace unit enable bit */
control &= ~0x1;
/*
* If the CPU supports v8.4 Trace filter Control,
* set the ETM to trace prohibited region.
*/
etm4x_prohibit_trace(drvdata);
/*
* Make sure everything completes before disabling, as recommended
* by section 7.3.77 ("TRCVICTLR, ViewInst Main Control Register,
* SSTATUS") of ARM IHI 0064D
*/
dsb(sy);
isb();
/* Trace synchronization barrier, is a nop if not supported */
tsb_csync();
etm4x_relaxed_write32(csa, control, TRCPRGCTLR);
/* wait for TRCSTATR.PMSTABLE to go to '1' */
if (coresight_timeout(csa, TRCSTATR, TRCSTATR_PMSTABLE_BIT, 1))
dev_err(etm_dev,
"timeout while waiting for PM stable Trace Status\n");
/* read the status of the single shot comparators */
for (i = 0; i < drvdata->nr_ss_cmp; i++) {
config->ss_status[i] =
etm4x_relaxed_read32(csa, TRCSSCSRn(i));
}
/* read back the current counter values */
for (i = 0; i < drvdata->nr_cntr; i++) {
config->cntr_val[i] =
etm4x_relaxed_read32(csa, TRCCNTVRn(i));
}
coresight_disclaim_device_unlocked(csdev);
etm4_cs_lock(drvdata, csa);
dev_dbg(&drvdata->csdev->dev,
"cpu: %d disable smp call done\n", drvdata->cpu);
}
static int etm4_disable_perf(struct coresight_device *csdev,
struct perf_event *event)
{
u32 control;
struct etm_filters *filters = event->hw.addr_filters;
struct etmv4_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
struct perf_event_attr *attr = &event->attr;
if (WARN_ON_ONCE(drvdata->cpu != smp_processor_id()))
return -EINVAL;
etm4_disable_hw(drvdata);
/*
* The config_id occupies bits 63:32 of the config2 perf event attr
* field. If this is non-zero then we will have enabled a config.
*/
if (attr->config2 & GENMASK_ULL(63, 32))
cscfg_csdev_disable_active_config(csdev);
/*
* Check if the start/stop logic was active when the unit was stopped.
* That way we can re-enable the start/stop logic when the process is
* scheduled again. Configuration of the start/stop logic happens in
* function etm4_set_event_filters().
*/
control = etm4x_relaxed_read32(&csdev->access, TRCVICTLR);
/* TRCVICTLR::SSSTATUS, bit[9] */
filters->ssstatus = (control & BIT(9));
/*
* perf will release trace ids when _free_aux() is
* called at the end of the session.
*/
return 0;
}
static void etm4_disable_sysfs(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.
*/
cpus_read_lock();
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);
spin_unlock(&drvdata->spinlock);
cpus_read_unlock();
/*
* we only release trace IDs when resetting sysfs.
* This permits sysfs users to read the trace ID after the trace
* session has completed. This maintains operational behaviour with
* prior trace id allocation method
*/
dev_dbg(&csdev->dev, "ETM tracing disabled\n");
}
static void etm4_disable(struct coresight_device *csdev,
struct perf_event *event)
{
u32 mode;
struct etmv4_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:
etm4_disable_sysfs(csdev);
break;
case CS_MODE_PERF:
etm4_disable_perf(csdev, event);
break;
}
if (mode)
local_set(&drvdata->mode, CS_MODE_DISABLED);
}
static const struct coresight_ops_source etm4_source_ops = {
.cpu_id = etm4_cpu_id,
.enable = etm4_enable,
.disable = etm4_disable,
};
static const struct coresight_ops etm4_cs_ops = {
.source_ops = &etm4_source_ops,
};
static inline bool cpu_supports_sysreg_trace(void)
{
u64 dfr0 = read_sysreg_s(SYS_ID_AA64DFR0_EL1);
return ((dfr0 >> ID_AA64DFR0_EL1_TraceVer_SHIFT) & 0xfUL) > 0;
}
static bool etm4_init_sysreg_access(struct etmv4_drvdata *drvdata,
struct csdev_access *csa)
{
u32 devarch;
if (!cpu_supports_sysreg_trace())
return false;
/*
* ETMs implementing sysreg access must implement TRCDEVARCH.
*/
devarch = read_etm4x_sysreg_const_offset(TRCDEVARCH);
switch (devarch & ETM_DEVARCH_ID_MASK) {
case ETM_DEVARCH_ETMv4x_ARCH:
*csa = (struct csdev_access) {
.io_mem = false,
.read = etm4x_sysreg_read,
.write = etm4x_sysreg_write,
};
break;
case ETM_DEVARCH_ETE_ARCH:
*csa = (struct csdev_access) {
.io_mem = false,
.read = ete_sysreg_read,
.write = ete_sysreg_write,
};
break;
default:
return false;
}
drvdata->arch = etm_devarch_to_arch(devarch);
return true;
}
static bool etm4_init_iomem_access(struct etmv4_drvdata *drvdata,
struct csdev_access *csa)
{
u32 devarch = readl_relaxed(drvdata->base + TRCDEVARCH);
/*
* All ETMs must implement TRCDEVARCH to indicate that
* the component is an ETMv4. Even though TRCIDR1 also
* contains the information, it is part of the "Trace"
* register and must be accessed with the OSLK cleared,
* with MMIO. But we cannot touch the OSLK until we are
* sure this is an ETM. So rely only on the TRCDEVARCH.
*/
if ((devarch & ETM_DEVARCH_ID_MASK) != ETM_DEVARCH_ETMv4x_ARCH) {
pr_warn_once("TRCDEVARCH doesn't match ETMv4 architecture\n");
return false;
}
drvdata->arch = etm_devarch_to_arch(devarch);
*csa = CSDEV_ACCESS_IOMEM(drvdata->base);
return true;
}
static bool etm4_init_csdev_access(struct etmv4_drvdata *drvdata,
struct csdev_access *csa)
{
/*
* Always choose the memory mapped io, if there is
* a memory map to prevent sysreg access on broken
* systems.
*/
if (drvdata->base)
return etm4_init_iomem_access(drvdata, csa);
if (etm4_init_sysreg_access(drvdata, csa))
return true;
return false;
}
static void cpu_detect_trace_filtering(struct etmv4_drvdata *drvdata)
{
u64 dfr0 = read_sysreg(id_aa64dfr0_el1);
u64 trfcr;
drvdata->trfcr = 0;
if (!cpuid_feature_extract_unsigned_field(dfr0, ID_AA64DFR0_EL1_TraceFilt_SHIFT))
return;
/*
* If the CPU supports v8.4 SelfHosted Tracing, enable
* tracing at the kernel EL and EL0, forcing to use the
* virtual time as the timestamp.
*/
trfcr = (TRFCR_ELx_TS_VIRTUAL |
TRFCR_ELx_ExTRE |
TRFCR_ELx_E0TRE);
/* If we are running at EL2, allow tracing the CONTEXTIDR_EL2. */
if (is_kernel_in_hyp_mode())
trfcr |= TRFCR_EL2_CX;
drvdata->trfcr = trfcr;
}
static void etm4_init_arch_data(void *info)
{
u32 etmidr0;
u32 etmidr2;
u32 etmidr3;
u32 etmidr4;
u32 etmidr5;
struct etm4_init_arg *init_arg = info;
struct etmv4_drvdata *drvdata;
struct csdev_access *csa;
int i;
drvdata = dev_get_drvdata(init_arg->dev);
csa = init_arg->csa;
/*
* If we are unable to detect the access mechanism,
* or unable to detect the trace unit type, fail
* early.
*/
if (!etm4_init_csdev_access(drvdata, csa))
return;
/* Detect the support for OS Lock before we actually use it */
etm_detect_os_lock(drvdata, csa);
/* Make sure all registers are accessible */
etm4_os_unlock_csa(drvdata, csa);
etm4_cs_unlock(drvdata, csa);
etm4_check_arch_features(drvdata, init_arg->pid);
/* find all capabilities of the tracing unit */
etmidr0 = etm4x_relaxed_read32(csa, TRCIDR0);
/* INSTP0, bits[2:1] P0 tracing support field */
drvdata->instrp0 = !!(FIELD_GET(TRCIDR0_INSTP0_MASK, etmidr0) == 0b11);
/* TRCBB, bit[5] Branch broadcast tracing support bit */
drvdata->trcbb = !!(etmidr0 & TRCIDR0_TRCBB);
/* TRCCOND, bit[6] Conditional instruction tracing support bit */
drvdata->trccond = !!(etmidr0 & TRCIDR0_TRCCOND);
/* TRCCCI, bit[7] Cycle counting instruction bit */
drvdata->trccci = !!(etmidr0 & TRCIDR0_TRCCCI);
/* RETSTACK, bit[9] Return stack bit */
drvdata->retstack = !!(etmidr0 & TRCIDR0_RETSTACK);
/* NUMEVENT, bits[11:10] Number of events field */
drvdata->nr_event = FIELD_GET(TRCIDR0_NUMEVENT_MASK, etmidr0);
/* QSUPP, bits[16:15] Q element support field */
drvdata->q_support = FIELD_GET(TRCIDR0_QSUPP_MASK, etmidr0);
/* TSSIZE, bits[28:24] Global timestamp size field */
drvdata->ts_size = FIELD_GET(TRCIDR0_TSSIZE_MASK, etmidr0);
/* maximum size of resources */
etmidr2 = etm4x_relaxed_read32(csa, TRCIDR2);
/* CIDSIZE, bits[9:5] Indicates the Context ID size */
drvdata->ctxid_size = FIELD_GET(TRCIDR2_CIDSIZE_MASK, etmidr2);
/* VMIDSIZE, bits[14:10] Indicates the VMID size */
drvdata->vmid_size = FIELD_GET(TRCIDR2_VMIDSIZE_MASK, etmidr2);
/* CCSIZE, bits[28:25] size of the cycle counter in bits minus 12 */
drvdata->ccsize = FIELD_GET(TRCIDR2_CCSIZE_MASK, etmidr2);
etmidr3 = etm4x_relaxed_read32(csa, TRCIDR3);
/* CCITMIN, bits[11:0] minimum threshold value that can be programmed */
drvdata->ccitmin = FIELD_GET(TRCIDR3_CCITMIN_MASK, etmidr3);
/* EXLEVEL_S, bits[19:16] Secure state instruction tracing */
drvdata->s_ex_level = FIELD_GET(TRCIDR3_EXLEVEL_S_MASK, etmidr3);
drvdata->config.s_ex_level = drvdata->s_ex_level;
/* EXLEVEL_NS, bits[23:20] Non-secure state instruction tracing */
drvdata->ns_ex_level = FIELD_GET(TRCIDR3_EXLEVEL_NS_MASK, etmidr3);
/*
* TRCERR, bit[24] whether a trace unit can trace a
* system error exception.
*/
drvdata->trc_error = !!(etmidr3 & TRCIDR3_TRCERR);
/* SYNCPR, bit[25] implementation has a fixed synchronization period? */
drvdata->syncpr = !!(etmidr3 & TRCIDR3_SYNCPR);
/* STALLCTL, bit[26] is stall control implemented? */
drvdata->stallctl = !!(etmidr3 & TRCIDR3_STALLCTL);
/* SYSSTALL, bit[27] implementation can support stall control? */
drvdata->sysstall = !!(etmidr3 & TRCIDR3_SYSSTALL);
/*
* NUMPROC - the number of PEs available for tracing, 5bits
* = TRCIDR3.bits[13:12]bits[30:28]
* bits[4:3] = TRCIDR3.bits[13:12] (since etm-v4.2, otherwise RES0)
* bits[3:0] = TRCIDR3.bits[30:28]
*/
drvdata->nr_pe = (FIELD_GET(TRCIDR3_NUMPROC_HI_MASK, etmidr3) << 3) |
FIELD_GET(TRCIDR3_NUMPROC_LO_MASK, etmidr3);
/* NOOVERFLOW, bit[31] is trace overflow prevention supported */
drvdata->nooverflow = !!(etmidr3 & TRCIDR3_NOOVERFLOW);
/* number of resources trace unit supports */
etmidr4 = etm4x_relaxed_read32(csa, TRCIDR4);
/* NUMACPAIRS, bits[0:3] number of addr comparator pairs for tracing */
drvdata->nr_addr_cmp = FIELD_GET(TRCIDR4_NUMACPAIRS_MASK, etmidr4);
/* NUMPC, bits[15:12] number of PE comparator inputs for tracing */
drvdata->nr_pe_cmp = FIELD_GET(TRCIDR4_NUMPC_MASK, etmidr4);
/*
* NUMRSPAIR, bits[19:16]
* The number of resource pairs conveyed by the HW starts at 0, i.e a
* value of 0x0 indicate 1 resource pair, 0x1 indicate two and so on.
* As such add 1 to the value of NUMRSPAIR for a better representation.
*
* For ETM v4.3 and later, 0x0 means 0, and no pairs are available -
* the default TRUE and FALSE resource selectors are omitted.
* Otherwise for values 0x1 and above the number is N + 1 as per v4.2.
*/
drvdata->nr_resource = FIELD_GET(TRCIDR4_NUMRSPAIR_MASK, etmidr4);
if ((drvdata->arch < ETM_ARCH_V4_3) || (drvdata->nr_resource > 0))
drvdata->nr_resource += 1;
/*
* NUMSSCC, bits[23:20] the number of single-shot
* comparator control for tracing. Read any status regs as these
* also contain RO capability data.
*/
drvdata->nr_ss_cmp = FIELD_GET(TRCIDR4_NUMSSCC_MASK, etmidr4);
for (i = 0; i < drvdata->nr_ss_cmp; i++) {
drvdata->config.ss_status[i] =
etm4x_relaxed_read32(csa, TRCSSCSRn(i));
}
/* NUMCIDC, bits[27:24] number of Context ID comparators for tracing */
drvdata->numcidc = FIELD_GET(TRCIDR4_NUMCIDC_MASK, etmidr4);
/* NUMVMIDC, bits[31:28] number of VMID comparators for tracing */
drvdata->numvmidc = FIELD_GET(TRCIDR4_NUMVMIDC_MASK, etmidr4);
etmidr5 = etm4x_relaxed_read32(csa, TRCIDR5);
/* NUMEXTIN, bits[8:0] number of external inputs implemented */
drvdata->nr_ext_inp = FIELD_GET(TRCIDR5_NUMEXTIN_MASK, etmidr5);
/* TRACEIDSIZE, bits[21:16] indicates the trace ID width */
drvdata->trcid_size = FIELD_GET(TRCIDR5_TRACEIDSIZE_MASK, etmidr5);
/* ATBTRIG, bit[22] implementation can support ATB triggers? */
drvdata->atbtrig = !!(etmidr5 & TRCIDR5_ATBTRIG);
/*
* LPOVERRIDE, bit[23] implementation supports
* low-power state override
*/
drvdata->lpoverride = (etmidr5 & TRCIDR5_LPOVERRIDE) && (!drvdata->skip_power_up);
/* NUMSEQSTATE, bits[27:25] number of sequencer states implemented */
drvdata->nrseqstate = FIELD_GET(TRCIDR5_NUMSEQSTATE_MASK, etmidr5);
/* NUMCNTR, bits[30:28] number of counters available for tracing */
drvdata->nr_cntr = FIELD_GET(TRCIDR5_NUMCNTR_MASK, etmidr5);
etm4_cs_lock(drvdata, csa);
cpu_detect_trace_filtering(drvdata);
}
static inline u32 etm4_get_victlr_access_type(struct etmv4_config *config)
{
return etm4_get_access_type(config) << __bf_shf(TRCVICTLR_EXLEVEL_MASK);
}
/* Set ELx trace filter access in the TRCVICTLR register */
static void etm4_set_victlr_access(struct etmv4_config *config)
{
config->vinst_ctrl &= ~TRCVICTLR_EXLEVEL_MASK;
config->vinst_ctrl |= etm4_get_victlr_access_type(config);
}
static void etm4_set_default_config(struct etmv4_config *config)
{
/* disable all events tracing */
config->eventctrl0 = 0x0;
config->eventctrl1 = 0x0;
/* disable stalling */
config->stall_ctrl = 0x0;
/* enable trace synchronization every 4096 bytes, if available */
config->syncfreq = 0xC;
/* disable timestamp event */
config->ts_ctrl = 0x0;
/* TRCVICTLR::EVENT = 0x01, select the always on logic */
config->vinst_ctrl = FIELD_PREP(TRCVICTLR_EVENT_MASK, 0x01);
/* TRCVICTLR::EXLEVEL_NS:EXLEVELS: Set kernel / user filtering */
etm4_set_victlr_access(config);
}
static u64 etm4_get_ns_access_type(struct etmv4_config *config)
{
u64 access_type = 0;
/*
* EXLEVEL_NS, for NonSecure Exception levels.
* The mask here is a generic value and must be
* shifted to the corresponding field for the registers
*/
if (!is_kernel_in_hyp_mode()) {
/* Stay away from hypervisor mode for non-VHE */
access_type = ETM_EXLEVEL_NS_HYP;
if (config->mode & ETM_MODE_EXCL_KERN)
access_type |= ETM_EXLEVEL_NS_OS;
} else if (config->mode & ETM_MODE_EXCL_KERN) {
access_type = ETM_EXLEVEL_NS_HYP;
}
if (config->mode & ETM_MODE_EXCL_USER)
access_type |= ETM_EXLEVEL_NS_APP;
return access_type;
}
/*
* Construct the exception level masks for a given config.
* This must be shifted to the corresponding register field
* for usage.
*/
static u64 etm4_get_access_type(struct etmv4_config *config)
{
/* All Secure exception levels are excluded from the trace */
return etm4_get_ns_access_type(config) | (u64)config->s_ex_level;
}
static u64 etm4_get_comparator_access_type(struct etmv4_config *config)
{
return etm4_get_access_type(config) << TRCACATR_EXLEVEL_SHIFT;
}
static void etm4_set_comparator_filter(struct etmv4_config *config,
u64 start, u64 stop, int comparator)
{
u64 access_type = etm4_get_comparator_access_type(config);
/* First half of default address comparator */
config->addr_val[comparator] = start;
config->addr_acc[comparator] = access_type;
config->addr_type[comparator] = ETM_ADDR_TYPE_RANGE;
/* Second half of default address comparator */
config->addr_val[comparator + 1] = stop;
config->addr_acc[comparator + 1] = access_type;
config->addr_type[comparator + 1] = ETM_ADDR_TYPE_RANGE;
/*
* Configure the ViewInst function to include this address range
* comparator.
*
* @comparator is divided by two since it is the index in the
* etmv4_config::addr_val array but register TRCVIIECTLR deals with
* address range comparator _pairs_.
*
* Therefore:
* index 0 -> compatator pair 0
* index 2 -> comparator pair 1
* index 4 -> comparator pair 2
* ...
* index 14 -> comparator pair 7
*/
config->viiectlr |= BIT(comparator / 2);
}
static void etm4_set_start_stop_filter(struct etmv4_config *config,
u64 address, int comparator,
enum etm_addr_type type)
{
int shift;
u64 access_type = etm4_get_comparator_access_type(config);
/* Configure the comparator */
config->addr_val[comparator] = address;
config->addr_acc[comparator] = access_type;
config->addr_type[comparator] = type;
/*
* Configure ViewInst Start-Stop control register.
* Addresses configured to start tracing go from bit 0 to n-1,
* while those configured to stop tracing from 16 to 16 + n-1.
*/
shift = (type == ETM_ADDR_TYPE_START ? 0 : 16);
config->vissctlr |= BIT(shift + comparator);
}
static void etm4_set_default_filter(struct etmv4_config *config)
{
/* Trace everything 'default' filter achieved by no filtering */
config->viiectlr = 0x0;
/*
* TRCVICTLR::SSSTATUS == 1, the start-stop logic is
* in the started state
*/
config->vinst_ctrl |= TRCVICTLR_SSSTATUS;
config->mode |= ETM_MODE_VIEWINST_STARTSTOP;
/* No start-stop filtering for ViewInst */
config->vissctlr = 0x0;
}
static void etm4_set_default(struct etmv4_config *config)
{
if (WARN_ON_ONCE(!config))
return;
/*
* Make default initialisation trace everything
*
* This is done by a minimum default config sufficient to enable
* full instruction trace - with a default filter for trace all
* achieved by having no filtering.
*/
etm4_set_default_config(config);
etm4_set_default_filter(config);
}
static int etm4_get_next_comparator(struct etmv4_drvdata *drvdata, u32 type)
{
int nr_comparator, index = 0;
struct etmv4_config *config = &drvdata->config;
/*
* nr_addr_cmp holds the number of comparator _pair_, so time 2
* for the total number of comparators.
*/
nr_comparator = drvdata->nr_addr_cmp * 2;
/* Go through the tally of comparators looking for a free one. */
while (index < nr_comparator) {
switch (type) {
case ETM_ADDR_TYPE_RANGE:
if (config->addr_type[index] == ETM_ADDR_TYPE_NONE &&
config->addr_type[index + 1] == ETM_ADDR_TYPE_NONE)
return index;
/* Address range comparators go in pairs */
index += 2;
break;
case ETM_ADDR_TYPE_START:
case ETM_ADDR_TYPE_STOP:
if (config->addr_type[index] == ETM_ADDR_TYPE_NONE)
return index;
/* Start/stop address can have odd indexes */
index += 1;
break;
default:
return -EINVAL;
}
}
/* If we are here all the comparators have been used. */
return -ENOSPC;
}
static int etm4_set_event_filters(struct etmv4_drvdata *drvdata,
struct perf_event *event)
{
int i, comparator, ret = 0;
u64 address;
struct etmv4_config *config = &drvdata->config;
struct etm_filters *filters = event->hw.addr_filters;
if (!filters)
goto default_filter;
/* Sync events with what Perf got */
perf_event_addr_filters_sync(event);
/*
* If there are no filters to deal with simply go ahead with
* the default filter, i.e the entire address range.
*/
if (!filters->nr_filters)
goto default_filter;
for (i = 0; i < filters->nr_filters; i++) {
struct etm_filter *filter = &filters->etm_filter[i];
enum etm_addr_type type = filter->type;
/* See if a comparator is free. */
comparator = etm4_get_next_comparator(drvdata, type);
if (comparator < 0) {
ret = comparator;
goto out;
}
switch (type) {
case ETM_ADDR_TYPE_RANGE:
etm4_set_comparator_filter(config,
filter->start_addr,
filter->stop_addr,
comparator);
/*
* TRCVICTLR::SSSTATUS == 1, the start-stop logic is
* in the started state
*/
config->vinst_ctrl |= TRCVICTLR_SSSTATUS;
/* No start-stop filtering for ViewInst */
config->vissctlr = 0x0;
break;
case ETM_ADDR_TYPE_START:
case ETM_ADDR_TYPE_STOP:
/* Get the right start or stop address */
address = (type == ETM_ADDR_TYPE_START ?
filter->start_addr :
filter->stop_addr);
/* Configure comparator */
etm4_set_start_stop_filter(config, address,
comparator, type);
/*
* If filters::ssstatus == 1, trace acquisition was
* started but the process was yanked away before the
* stop address was hit. As such the start/stop
* logic needs to be re-started so that tracing can
* resume where it left.
*
* The start/stop logic status when a process is
* scheduled out is checked in function
* etm4_disable_perf().
*/
if (filters->ssstatus)
config->vinst_ctrl |= TRCVICTLR_SSSTATUS;
/* No include/exclude filtering for ViewInst */
config->viiectlr = 0x0;
break;
default:
ret = -EINVAL;
goto out;
}
}
goto out;
default_filter:
etm4_set_default_filter(config);
out:
return ret;
}
void etm4_config_trace_mode(struct etmv4_config *config)
{
u32 mode;
mode = config->mode;
mode &= (ETM_MODE_EXCL_KERN | ETM_MODE_EXCL_USER);
/* excluding kernel AND user space doesn't make sense */
WARN_ON_ONCE(mode == (ETM_MODE_EXCL_KERN | ETM_MODE_EXCL_USER));
/* nothing to do if neither flags are set */
if (!(mode & ETM_MODE_EXCL_KERN) && !(mode & ETM_MODE_EXCL_USER))
return;
etm4_set_victlr_access(config);
}
static int etm4_online_cpu(unsigned int cpu)
{
if (!etmdrvdata[cpu])
return etm4_probe_cpu(cpu);
if (etmdrvdata[cpu]->boot_enable && !etmdrvdata[cpu]->sticky_enable)
coresight_enable(etmdrvdata[cpu]->csdev);
return 0;
}
static int etm4_starting_cpu(unsigned int cpu)
{
if (!etmdrvdata[cpu])
return 0;
spin_lock(&etmdrvdata[cpu]->spinlock);
if (!etmdrvdata[cpu]->os_unlock)
etm4_os_unlock(etmdrvdata[cpu]);
if (local_read(&etmdrvdata[cpu]->mode))
etm4_enable_hw(etmdrvdata[cpu]);
spin_unlock(&etmdrvdata[cpu]->spinlock);
return 0;
}
static int etm4_dying_cpu(unsigned int cpu)
{
if (!etmdrvdata[cpu])
return 0;
spin_lock(&etmdrvdata[cpu]->spinlock);
if (local_read(&etmdrvdata[cpu]->mode))
etm4_disable_hw(etmdrvdata[cpu]);
spin_unlock(&etmdrvdata[cpu]->spinlock);
return 0;
}
static int __etm4_cpu_save(struct etmv4_drvdata *drvdata)
{
int i, ret = 0;
struct etmv4_save_state *state;
struct coresight_device *csdev = drvdata->csdev;
struct csdev_access *csa;
struct device *etm_dev;
if (WARN_ON(!csdev))
return -ENODEV;
etm_dev = &csdev->dev;
csa = &csdev->access;
/*
* As recommended by 3.4.1 ("The procedure when powering down the PE")
* of ARM IHI 0064D
*/
dsb(sy);
isb();
etm4_cs_unlock(drvdata, csa);
/* Lock the OS lock to disable trace and external debugger access */
etm4_os_lock(drvdata);
/* wait for TRCSTATR.PMSTABLE to go up */
if (coresight_timeout(csa, TRCSTATR, TRCSTATR_PMSTABLE_BIT, 1)) {
dev_err(etm_dev,
"timeout while waiting for PM Stable Status\n");
etm4_os_unlock(drvdata);
ret = -EBUSY;
goto out;
}
state = drvdata->save_state;
state->trcprgctlr = etm4x_read32(csa, TRCPRGCTLR);
if (drvdata->nr_pe)
state->trcprocselr = etm4x_read32(csa, TRCPROCSELR);
state->trcconfigr = etm4x_read32(csa, TRCCONFIGR);
state->trcauxctlr = etm4x_read32(csa, TRCAUXCTLR);
state->trceventctl0r = etm4x_read32(csa, TRCEVENTCTL0R);
state->trceventctl1r = etm4x_read32(csa, TRCEVENTCTL1R);
if (drvdata->stallctl)
state->trcstallctlr = etm4x_read32(csa, TRCSTALLCTLR);
state->trctsctlr = etm4x_read32(csa, TRCTSCTLR);
state->trcsyncpr = etm4x_read32(csa, TRCSYNCPR);
state->trcccctlr = etm4x_read32(csa, TRCCCCTLR);
state->trcbbctlr = etm4x_read32(csa, TRCBBCTLR);
state->trctraceidr = etm4x_read32(csa, TRCTRACEIDR);
state->trcqctlr = etm4x_read32(csa, TRCQCTLR);
state->trcvictlr = etm4x_read32(csa, TRCVICTLR);
state->trcviiectlr = etm4x_read32(csa, TRCVIIECTLR);
state->trcvissctlr = etm4x_read32(csa, TRCVISSCTLR);
if (drvdata->nr_pe_cmp)
state->trcvipcssctlr = etm4x_read32(csa, TRCVIPCSSCTLR);
state->trcvdctlr = etm4x_read32(csa, TRCVDCTLR);
state->trcvdsacctlr = etm4x_read32(csa, TRCVDSACCTLR);
state->trcvdarcctlr = etm4x_read32(csa, TRCVDARCCTLR);
for (i = 0; i < drvdata->nrseqstate - 1; i++)
state->trcseqevr[i] = etm4x_read32(csa, TRCSEQEVRn(i));
if (drvdata->nrseqstate) {
state->trcseqrstevr = etm4x_read32(csa, TRCSEQRSTEVR);
state->trcseqstr = etm4x_read32(csa, TRCSEQSTR);
}
state->trcextinselr = etm4x_read32(csa, TRCEXTINSELR);
for (i = 0; i < drvdata->nr_cntr; i++) {
state->trccntrldvr[i] = etm4x_read32(csa, TRCCNTRLDVRn(i));
state->trccntctlr[i] = etm4x_read32(csa, TRCCNTCTLRn(i));
state->trccntvr[i] = etm4x_read32(csa, TRCCNTVRn(i));
}
for (i = 0; i < drvdata->nr_resource * 2; i++)
state->trcrsctlr[i] = etm4x_read32(csa, TRCRSCTLRn(i));
for (i = 0; i < drvdata->nr_ss_cmp; i++) {
state->trcssccr[i] = etm4x_read32(csa, TRCSSCCRn(i));
state->trcsscsr[i] = etm4x_read32(csa, TRCSSCSRn(i));
if (etm4x_sspcicrn_present(drvdata, i))
state->trcsspcicr[i] = etm4x_read32(csa, TRCSSPCICRn(i));
}
for (i = 0; i < drvdata->nr_addr_cmp * 2; i++) {
state->trcacvr[i] = etm4x_read64(csa, TRCACVRn(i));
state->trcacatr[i] = etm4x_read64(csa, TRCACATRn(i));
}
/*
* Data trace stream is architecturally prohibited for A profile cores
* so we don't save (or later restore) trcdvcvr and trcdvcmr - As per
* section 1.3.4 ("Possible functional configurations of an ETMv4 trace
* unit") of ARM IHI 0064D.
*/
for (i = 0; i < drvdata->numcidc; i++)
state->trccidcvr[i] = etm4x_read64(csa, TRCCIDCVRn(i));
for (i = 0; i < drvdata->numvmidc; i++)
state->trcvmidcvr[i] = etm4x_read64(csa, TRCVMIDCVRn(i));
state->trccidcctlr0 = etm4x_read32(csa, TRCCIDCCTLR0);
if (drvdata->numcidc > 4)
state->trccidcctlr1 = etm4x_read32(csa, TRCCIDCCTLR1);
state->trcvmidcctlr0 = etm4x_read32(csa, TRCVMIDCCTLR0);
if (drvdata->numvmidc > 4)
state->trcvmidcctlr0 = etm4x_read32(csa, TRCVMIDCCTLR1);
state->trcclaimset = etm4x_read32(csa, TRCCLAIMCLR);
if (!drvdata->skip_power_up)
state->trcpdcr = etm4x_read32(csa, TRCPDCR);
/* wait for TRCSTATR.IDLE to go up */
if (coresight_timeout(csa, TRCSTATR, TRCSTATR_IDLE_BIT, 1)) {
dev_err(etm_dev,
"timeout while waiting for Idle Trace Status\n");
etm4_os_unlock(drvdata);
ret = -EBUSY;
goto out;
}
drvdata->state_needs_restore = true;
/*
* Power can be removed from the trace unit now. We do this to
* potentially save power on systems that respect the TRCPDCR_PU
* despite requesting software to save/restore state.
*/
if (!drvdata->skip_power_up)
etm4x_relaxed_write32(csa, (state->trcpdcr & ~TRCPDCR_PU),
TRCPDCR);
out:
etm4_cs_lock(drvdata, csa);
return ret;
}
static int etm4_cpu_save(struct etmv4_drvdata *drvdata)
{
int ret = 0;
/* Save the TRFCR irrespective of whether the ETM is ON */
if (drvdata->trfcr)
drvdata->save_trfcr = read_trfcr();
/*
* Save and restore the ETM Trace registers only if
* the ETM is active.
*/
if (local_read(&drvdata->mode) && drvdata->save_state)
ret = __etm4_cpu_save(drvdata);
return ret;
}
static void __etm4_cpu_restore(struct etmv4_drvdata *drvdata)
{
int i;
struct etmv4_save_state *state = drvdata->save_state;
struct csdev_access tmp_csa = CSDEV_ACCESS_IOMEM(drvdata->base);
struct csdev_access *csa = &tmp_csa;
etm4_cs_unlock(drvdata, csa);
etm4x_relaxed_write32(csa, state->trcclaimset, TRCCLAIMSET);
etm4x_relaxed_write32(csa, state->trcprgctlr, TRCPRGCTLR);
if (drvdata->nr_pe)
etm4x_relaxed_write32(csa, state->trcprocselr, TRCPROCSELR);
etm4x_relaxed_write32(csa, state->trcconfigr, TRCCONFIGR);
etm4x_relaxed_write32(csa, state->trcauxctlr, TRCAUXCTLR);
etm4x_relaxed_write32(csa, state->trceventctl0r, TRCEVENTCTL0R);
etm4x_relaxed_write32(csa, state->trceventctl1r, TRCEVENTCTL1R);
if (drvdata->stallctl)
etm4x_relaxed_write32(csa, state->trcstallctlr, TRCSTALLCTLR);
etm4x_relaxed_write32(csa, state->trctsctlr, TRCTSCTLR);
etm4x_relaxed_write32(csa, state->trcsyncpr, TRCSYNCPR);
etm4x_relaxed_write32(csa, state->trcccctlr, TRCCCCTLR);
etm4x_relaxed_write32(csa, state->trcbbctlr, TRCBBCTLR);
etm4x_relaxed_write32(csa, state->trctraceidr, TRCTRACEIDR);
etm4x_relaxed_write32(csa, state->trcqctlr, TRCQCTLR);
etm4x_relaxed_write32(csa, state->trcvictlr, TRCVICTLR);
etm4x_relaxed_write32(csa, state->trcviiectlr, TRCVIIECTLR);
etm4x_relaxed_write32(csa, state->trcvissctlr, TRCVISSCTLR);
if (drvdata->nr_pe_cmp)
etm4x_relaxed_write32(csa, state->trcvipcssctlr, TRCVIPCSSCTLR);
etm4x_relaxed_write32(csa, state->trcvdctlr, TRCVDCTLR);
etm4x_relaxed_write32(csa, state->trcvdsacctlr, TRCVDSACCTLR);
etm4x_relaxed_write32(csa, state->trcvdarcctlr, TRCVDARCCTLR);
for (i = 0; i < drvdata->nrseqstate - 1; i++)
etm4x_relaxed_write32(csa, state->trcseqevr[i], TRCSEQEVRn(i));
if (drvdata->nrseqstate) {
etm4x_relaxed_write32(csa, state->trcseqrstevr, TRCSEQRSTEVR);
etm4x_relaxed_write32(csa, state->trcseqstr, TRCSEQSTR);
}
etm4x_relaxed_write32(csa, state->trcextinselr, TRCEXTINSELR);
for (i = 0; i < drvdata->nr_cntr; i++) {
etm4x_relaxed_write32(csa, state->trccntrldvr[i], TRCCNTRLDVRn(i));
etm4x_relaxed_write32(csa, state->trccntctlr[i], TRCCNTCTLRn(i));
etm4x_relaxed_write32(csa, state->trccntvr[i], TRCCNTVRn(i));
}
for (i = 0; i < drvdata->nr_resource * 2; i++)
etm4x_relaxed_write32(csa, state->trcrsctlr[i], TRCRSCTLRn(i));
for (i = 0; i < drvdata->nr_ss_cmp; i++) {
etm4x_relaxed_write32(csa, state->trcssccr[i], TRCSSCCRn(i));
etm4x_relaxed_write32(csa, state->trcsscsr[i], TRCSSCSRn(i));
if (etm4x_sspcicrn_present(drvdata, i))
etm4x_relaxed_write32(csa, state->trcsspcicr[i], TRCSSPCICRn(i));
}
for (i = 0; i < drvdata->nr_addr_cmp * 2; i++) {
etm4x_relaxed_write64(csa, state->trcacvr[i], TRCACVRn(i));
etm4x_relaxed_write64(csa, state->trcacatr[i], TRCACATRn(i));
}
for (i = 0; i < drvdata->numcidc; i++)
etm4x_relaxed_write64(csa, state->trccidcvr[i], TRCCIDCVRn(i));
for (i = 0; i < drvdata->numvmidc; i++)
etm4x_relaxed_write64(csa, state->trcvmidcvr[i], TRCVMIDCVRn(i));
etm4x_relaxed_write32(csa, state->trccidcctlr0, TRCCIDCCTLR0);
if (drvdata->numcidc > 4)
etm4x_relaxed_write32(csa, state->trccidcctlr1, TRCCIDCCTLR1);
etm4x_relaxed_write32(csa, state->trcvmidcctlr0, TRCVMIDCCTLR0);
if (drvdata->numvmidc > 4)
etm4x_relaxed_write32(csa, state->trcvmidcctlr0, TRCVMIDCCTLR1);
etm4x_relaxed_write32(csa, state->trcclaimset, TRCCLAIMSET);
if (!drvdata->skip_power_up)
etm4x_relaxed_write32(csa, state->trcpdcr, TRCPDCR);
drvdata->state_needs_restore = false;
/*
* As recommended by section 4.3.7 ("Synchronization when using the
* memory-mapped interface") of ARM IHI 0064D
*/
dsb(sy);
isb();
/* Unlock the OS lock to re-enable trace and external debug access */
etm4_os_unlock(drvdata);
etm4_cs_lock(drvdata, csa);
}
static void etm4_cpu_restore(struct etmv4_drvdata *drvdata)
{
if (drvdata->trfcr)
write_trfcr(drvdata->save_trfcr);
if (drvdata->state_needs_restore)
__etm4_cpu_restore(drvdata);
}
static int etm4_cpu_pm_notify(struct notifier_block *nb, unsigned long cmd,
void *v)
{
struct etmv4_drvdata *drvdata;
unsigned int cpu = smp_processor_id();
if (!etmdrvdata[cpu])
return NOTIFY_OK;
drvdata = etmdrvdata[cpu];
if (WARN_ON_ONCE(drvdata->cpu != cpu))
return NOTIFY_BAD;
switch (cmd) {
case CPU_PM_ENTER:
if (etm4_cpu_save(drvdata))
return NOTIFY_BAD;
break;
case CPU_PM_EXIT:
case CPU_PM_ENTER_FAILED:
etm4_cpu_restore(drvdata);
break;
default:
return NOTIFY_DONE;
}
return NOTIFY_OK;
}
static struct notifier_block etm4_cpu_pm_nb = {
.notifier_call = etm4_cpu_pm_notify,
};
/* Setup PM. Deals with error conditions and counts */
static int __init etm4_pm_setup(void)
{
int ret;
ret = cpu_pm_register_notifier(&etm4_cpu_pm_nb);
if (ret)
return ret;
ret = cpuhp_setup_state_nocalls(CPUHP_AP_ARM_CORESIGHT_STARTING,
"arm/coresight4:starting",
etm4_starting_cpu, etm4_dying_cpu);
if (ret)
goto unregister_notifier;
ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
"arm/coresight4:online",
etm4_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);
unregister_notifier:
cpu_pm_unregister_notifier(&etm4_cpu_pm_nb);
return ret;
}
static void etm4_pm_clear(void)
{
cpu_pm_unregister_notifier(&etm4_cpu_pm_nb);
cpuhp_remove_state_nocalls(CPUHP_AP_ARM_CORESIGHT_STARTING);
if (hp_online) {
cpuhp_remove_state_nocalls(hp_online);
hp_online = 0;
}
}
static int etm4_add_coresight_dev(struct etm4_init_arg *init_arg)
{
int ret;
struct coresight_platform_data *pdata = NULL;
struct device *dev = init_arg->dev;
struct etmv4_drvdata *drvdata = dev_get_drvdata(dev);
struct coresight_desc desc = { 0 };
u8 major, minor;
char *type_name;
if (!drvdata)
return -EINVAL;
desc.access = *init_arg->csa;
if (!drvdata->arch)
return -EINVAL;
/* TRCPDCR is not accessible with system instructions. */
if (!desc.access.io_mem ||
fwnode_property_present(dev_fwnode(dev), "qcom,skip-power-up"))
drvdata->skip_power_up = true;
major = ETM_ARCH_MAJOR_VERSION(drvdata->arch);
minor = ETM_ARCH_MINOR_VERSION(drvdata->arch);
if (etm4x_is_ete(drvdata)) {
type_name = "ete";
/* ETE v1 has major version == 0b101. Adjust this for logging.*/
major -= 4;
} else {
type_name = "etm";
}
desc.name = devm_kasprintf(dev, GFP_KERNEL,
"%s%d", type_name, drvdata->cpu);
if (!desc.name)
return -ENOMEM;
etm4_set_default(&drvdata->config);
pdata = coresight_get_platform_data(dev);
if (IS_ERR(pdata))
return PTR_ERR(pdata);
dev->platform_data = pdata;
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))
return PTR_ERR(drvdata->csdev);
ret = etm_perf_symlink(drvdata->csdev, true);
if (ret) {
coresight_unregister(drvdata->csdev);
return ret;
}
/* register with config infrastructure & load any current features */
ret = etm4_cscfg_register(drvdata->csdev);
if (ret) {
coresight_unregister(drvdata->csdev);
return ret;
}
etmdrvdata[drvdata->cpu] = drvdata;
dev_info(&drvdata->csdev->dev, "CPU%d: %s v%d.%d initialized\n",
drvdata->cpu, type_name, major, minor);
if (boot_enable) {
coresight_enable(drvdata->csdev);
drvdata->boot_enable = true;
}
return 0;
}
static int etm4_probe(struct device *dev, void __iomem *base, u32 etm_pid)
{
struct etmv4_drvdata *drvdata;
struct csdev_access access = { 0 };
struct etm4_init_arg init_arg = { 0 };
struct etm4_init_arg *delayed;
drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
if (!drvdata)
return -ENOMEM;
dev_set_drvdata(dev, drvdata);
if (pm_save_enable == PARAM_PM_SAVE_FIRMWARE)
pm_save_enable = coresight_loses_context_with_cpu(dev) ?
PARAM_PM_SAVE_SELF_HOSTED : PARAM_PM_SAVE_NEVER;
if (pm_save_enable != PARAM_PM_SAVE_NEVER) {
drvdata->save_state = devm_kmalloc(dev,
sizeof(struct etmv4_save_state), GFP_KERNEL);
if (!drvdata->save_state)
return -ENOMEM;
}
drvdata->base = base;
spin_lock_init(&drvdata->spinlock);
drvdata->cpu = coresight_get_cpu(dev);
if (drvdata->cpu < 0)
return drvdata->cpu;
init_arg.dev = dev;
init_arg.csa = &access;
init_arg.pid = etm_pid;
/*
* Serialize against CPUHP callbacks to avoid race condition
* between the smp call and saving the delayed probe.
*/
cpus_read_lock();
if (smp_call_function_single(drvdata->cpu,
etm4_init_arch_data, &init_arg, 1)) {
/* The CPU was offline, try again once it comes online. */
delayed = devm_kmalloc(dev, sizeof(*delayed), GFP_KERNEL);
if (!delayed) {
cpus_read_unlock();
return -ENOMEM;
}
*delayed = init_arg;
per_cpu(delayed_probe, drvdata->cpu) = delayed;
cpus_read_unlock();
return 0;
}
cpus_read_unlock();
return etm4_add_coresight_dev(&init_arg);
}
static int etm4_probe_amba(struct amba_device *adev, const struct amba_id *id)
{
void __iomem *base;
struct device *dev = &adev->dev;
struct resource *res = &adev->res;
int ret;
/* 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);
ret = etm4_probe(dev, base, id->id);
if (!ret)
pm_runtime_put(&adev->dev);
return ret;
}
static int etm4_probe_platform_dev(struct platform_device *pdev)
{
int ret;
pm_runtime_get_noresume(&pdev->dev);
pm_runtime_set_active(&pdev->dev);
pm_runtime_enable(&pdev->dev);
/*
* System register based devices could match the
* HW by reading appropriate registers on the HW
* and thus we could skip the PID.
*/
ret = etm4_probe(&pdev->dev, NULL, 0);
pm_runtime_put(&pdev->dev);
return ret;
}
static int etm4_probe_cpu(unsigned int cpu)
{
int ret;
struct etm4_init_arg init_arg;
struct csdev_access access = { 0 };
struct etm4_init_arg *iap = *this_cpu_ptr(&delayed_probe);
if (!iap)
return 0;
init_arg = *iap;
devm_kfree(init_arg.dev, iap);
*this_cpu_ptr(&delayed_probe) = NULL;
ret = pm_runtime_resume_and_get(init_arg.dev);
if (ret < 0) {
dev_err(init_arg.dev, "Failed to get PM runtime!\n");
return 0;
}
init_arg.csa = &access;
etm4_init_arch_data(&init_arg);
etm4_add_coresight_dev(&init_arg);
pm_runtime_put(init_arg.dev);
return 0;
}
static struct amba_cs_uci_id uci_id_etm4[] = {
{
/* ETMv4 UCI data */
.devarch = ETM_DEVARCH_ETMv4x_ARCH,
.devarch_mask = ETM_DEVARCH_ID_MASK,
.devtype = 0x00000013,
}
};
static void clear_etmdrvdata(void *info)
{
int cpu = *(int *)info;
etmdrvdata[cpu] = NULL;
per_cpu(delayed_probe, cpu) = NULL;
}
static int __exit etm4_remove_dev(struct etmv4_drvdata *drvdata)
{
bool had_delayed_probe;
/*
* Taking hotplug lock here to avoid racing between etm4_remove_dev()
* and CPU hotplug call backs.
*/
cpus_read_lock();
had_delayed_probe = per_cpu(delayed_probe, drvdata->cpu);
/*
* 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))
clear_etmdrvdata(&drvdata->cpu);
cpus_read_unlock();
if (!had_delayed_probe) {
etm_perf_symlink(drvdata->csdev, false);
cscfg_unregister_csdev(drvdata->csdev);
coresight_unregister(drvdata->csdev);
}
return 0;
}
static void __exit etm4_remove_amba(struct amba_device *adev)
{
struct etmv4_drvdata *drvdata = dev_get_drvdata(&adev->dev);
if (drvdata)
etm4_remove_dev(drvdata);
}
static int __exit etm4_remove_platform_dev(struct platform_device *pdev)
{
int ret = 0;
struct etmv4_drvdata *drvdata = dev_get_drvdata(&pdev->dev);
if (drvdata)
ret = etm4_remove_dev(drvdata);
pm_runtime_disable(&pdev->dev);
return ret;
}
static const struct amba_id etm4_ids[] = {
CS_AMBA_ID(0x000bb95d), /* Cortex-A53 */
CS_AMBA_ID(0x000bb95e), /* Cortex-A57 */
CS_AMBA_ID(0x000bb95a), /* Cortex-A72 */
CS_AMBA_ID(0x000bb959), /* Cortex-A73 */
CS_AMBA_UCI_ID(0x000bb9da, uci_id_etm4),/* Cortex-A35 */
CS_AMBA_UCI_ID(0x000bbd05, uci_id_etm4),/* Cortex-A55 */
CS_AMBA_UCI_ID(0x000bbd0a, uci_id_etm4),/* Cortex-A75 */
CS_AMBA_UCI_ID(0x000bbd0c, uci_id_etm4),/* Neoverse N1 */
CS_AMBA_UCI_ID(0x000bbd41, uci_id_etm4),/* Cortex-A78 */
CS_AMBA_UCI_ID(0x000f0205, uci_id_etm4),/* Qualcomm Kryo */
CS_AMBA_UCI_ID(0x000f0211, uci_id_etm4),/* Qualcomm Kryo */
CS_AMBA_UCI_ID(0x000bb802, uci_id_etm4),/* Qualcomm Kryo 385 Cortex-A55 */
CS_AMBA_UCI_ID(0x000bb803, uci_id_etm4),/* Qualcomm Kryo 385 Cortex-A75 */
CS_AMBA_UCI_ID(0x000bb805, uci_id_etm4),/* Qualcomm Kryo 4XX Cortex-A55 */
CS_AMBA_UCI_ID(0x000bb804, uci_id_etm4),/* Qualcomm Kryo 4XX Cortex-A76 */
CS_AMBA_UCI_ID(0x000bbd0d, uci_id_etm4),/* Qualcomm Kryo 5XX Cortex-A77 */
CS_AMBA_UCI_ID(0x000cc0af, uci_id_etm4),/* Marvell ThunderX2 */
CS_AMBA_UCI_ID(0x000b6d01, uci_id_etm4),/* HiSilicon-Hip08 */
CS_AMBA_UCI_ID(0x000b6d02, uci_id_etm4),/* HiSilicon-Hip09 */
{},
};
MODULE_DEVICE_TABLE(amba, etm4_ids);
static struct amba_driver etm4x_amba_driver = {
.drv = {
.name = "coresight-etm4x",
.owner = THIS_MODULE,
.suppress_bind_attrs = true,
},
.probe = etm4_probe_amba,
.remove = etm4_remove_amba,
.id_table = etm4_ids,
};
static const struct of_device_id etm4_sysreg_match[] = {
{ .compatible = "arm,coresight-etm4x-sysreg" },
{ .compatible = "arm,embedded-trace-extension" },
{}
};
static struct platform_driver etm4_platform_driver = {
.probe = etm4_probe_platform_dev,
.remove = etm4_remove_platform_dev,
.driver = {
.name = "coresight-etm4x",
.of_match_table = etm4_sysreg_match,
.suppress_bind_attrs = true,
},
};
static int __init etm4x_init(void)
{
int ret;
ret = etm4_pm_setup();
/* etm4_pm_setup() does its own cleanup - exit on error */
if (ret)
return ret;
ret = amba_driver_register(&etm4x_amba_driver);
if (ret) {
pr_err("Error registering etm4x AMBA driver\n");
goto clear_pm;
}
ret = platform_driver_register(&etm4_platform_driver);
if (!ret)
return 0;
pr_err("Error registering etm4x platform driver\n");
amba_driver_unregister(&etm4x_amba_driver);
clear_pm:
etm4_pm_clear();
return ret;
}
static void __exit etm4x_exit(void)
{
amba_driver_unregister(&etm4x_amba_driver);
platform_driver_unregister(&etm4_platform_driver);
etm4_pm_clear();
}
module_init(etm4x_init);
module_exit(etm4x_exit);
MODULE_AUTHOR("Pratik Patel <pratikp@codeaurora.org>");
MODULE_AUTHOR("Mathieu Poirier <mathieu.poirier@linaro.org>");
MODULE_DESCRIPTION("Arm CoreSight Program Flow Trace v4.x driver");
MODULE_LICENSE("GPL v2");