diff options
Diffstat (limited to 'drivers/hwtracing/coresight/coresight-etm4x-core.c')
| -rw-r--r-- | drivers/hwtracing/coresight/coresight-etm4x-core.c | 1659 |
1 files changed, 1659 insertions, 0 deletions
diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/drivers/hwtracing/coresight/coresight-etm4x-core.c new file mode 100644 index 000000000000..abd706b216ac --- /dev/null +++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c @@ -0,0 +1,1659 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2014, The Linux Foundation. All rights reserved. + */ + +#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/pm_runtime.h> +#include <linux/property.h> +#include <asm/sections.h> +#include <asm/local.h> +#include <asm/virt.h> + +#include "coresight-etm4x.h" +#include "coresight-etm-perf.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; + +static void etm4_os_unlock(struct etmv4_drvdata *drvdata) +{ + /* Writing 0 to TRCOSLAR unlocks the trace registers */ + writel_relaxed(0x0, drvdata->base + TRCOSLAR); + drvdata->os_unlock = true; + isb(); +} + +static void etm4_os_lock(struct etmv4_drvdata *drvdata) +{ + /* Writing 0x1 to TRCOSLAR locks the trace registers */ + writel_relaxed(0x1, drvdata->base + TRCOSLAR); + drvdata->os_unlock = false; + isb(); +} + +static bool etm4_arch_supported(u8 arch) +{ + /* Mask out the minor version number */ + switch (arch & 0xf0) { + case ETM_ARCH_V4: + break; + default: + return false; + } + return true; +} + +static int etm4_cpu_id(struct coresight_device *csdev) +{ + struct etmv4_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); + + return drvdata->cpu; +} + +static int etm4_trace_id(struct coresight_device *csdev) +{ + struct etmv4_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); + + return drvdata->trcid; +} + +struct etm4_enable_arg { + struct etmv4_drvdata *drvdata; + int rc; +}; + +static int etm4_enable_hw(struct etmv4_drvdata *drvdata) +{ + int i, rc; + struct etmv4_config *config = &drvdata->config; + struct device *etm_dev = &drvdata->csdev->dev; + + CS_UNLOCK(drvdata->base); + + etm4_os_unlock(drvdata); + + rc = coresight_claim_device_unlocked(drvdata->base); + if (rc) + goto done; + + /* 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(etm_dev, + "timeout while waiting for Idle Trace Status\n"); + + writel_relaxed(config->pe_sel, drvdata->base + TRCPROCSELR); + writel_relaxed(config->cfg, drvdata->base + TRCCONFIGR); + /* nothing specific implemented */ + writel_relaxed(0x0, drvdata->base + TRCAUXCTLR); + writel_relaxed(config->eventctrl0, drvdata->base + TRCEVENTCTL0R); + writel_relaxed(config->eventctrl1, drvdata->base + TRCEVENTCTL1R); + writel_relaxed(config->stall_ctrl, drvdata->base + TRCSTALLCTLR); + writel_relaxed(config->ts_ctrl, drvdata->base + TRCTSCTLR); + writel_relaxed(config->syncfreq, drvdata->base + TRCSYNCPR); + writel_relaxed(config->ccctlr, drvdata->base + TRCCCCTLR); + writel_relaxed(config->bb_ctrl, drvdata->base + TRCBBCTLR); + writel_relaxed(drvdata->trcid, drvdata->base + TRCTRACEIDR); + writel_relaxed(config->vinst_ctrl, drvdata->base + TRCVICTLR); + writel_relaxed(config->viiectlr, drvdata->base + TRCVIIECTLR); + writel_relaxed(config->vissctlr, + drvdata->base + TRCVISSCTLR); + writel_relaxed(config->vipcssctlr, + drvdata->base + TRCVIPCSSCTLR); + for (i = 0; i < drvdata->nrseqstate - 1; i++) + writel_relaxed(config->seq_ctrl[i], + drvdata->base + TRCSEQEVRn(i)); + writel_relaxed(config->seq_rst, drvdata->base + TRCSEQRSTEVR); + writel_relaxed(config->seq_state, drvdata->base + TRCSEQSTR); + writel_relaxed(config->ext_inp, drvdata->base + TRCEXTINSELR); + for (i = 0; i < drvdata->nr_cntr; i++) { + writel_relaxed(config->cntrldvr[i], + drvdata->base + TRCCNTRLDVRn(i)); + writel_relaxed(config->cntr_ctrl[i], + drvdata->base + TRCCNTCTLRn(i)); + writel_relaxed(config->cntr_val[i], + drvdata->base + 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++) + writel_relaxed(config->res_ctrl[i], + drvdata->base + 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] &= ~BIT(31); + writel_relaxed(config->ss_ctrl[i], + drvdata->base + TRCSSCCRn(i)); + writel_relaxed(config->ss_status[i], + drvdata->base + TRCSSCSRn(i)); + writel_relaxed(config->ss_pe_cmp[i], + drvdata->base + TRCSSPCICRn(i)); + } + for (i = 0; i < drvdata->nr_addr_cmp; i++) { + writeq_relaxed(config->addr_val[i], + drvdata->base + TRCACVRn(i)); + writeq_relaxed(config->addr_acc[i], + drvdata->base + TRCACATRn(i)); + } + for (i = 0; i < drvdata->numcidc; i++) + writeq_relaxed(config->ctxid_pid[i], + drvdata->base + TRCCIDCVRn(i)); + writel_relaxed(config->ctxid_mask0, drvdata->base + TRCCIDCCTLR0); + writel_relaxed(config->ctxid_mask1, drvdata->base + TRCCIDCCTLR1); + + for (i = 0; i < drvdata->numvmidc; i++) + writeq_relaxed(config->vmid_val[i], + drvdata->base + TRCVMIDCVRn(i)); + writel_relaxed(config->vmid_mask0, drvdata->base + TRCVMIDCCTLR0); + writel_relaxed(config->vmid_mask1, drvdata->base + TRCVMIDCCTLR1); + + if (!drvdata->skip_power_up) { + /* + * Request to keep the trace unit powered and also + * emulation of powerdown + */ + writel_relaxed(readl_relaxed(drvdata->base + TRCPDCR) | + TRCPDCR_PU, drvdata->base + TRCPDCR); + } + + /* 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(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: + CS_LOCK(drvdata->base); + + 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 etmv4_drvdata *drvdata, + struct perf_event *event) +{ + int ret = 0; + struct etmv4_config *config = &drvdata->config; + struct perf_event_attr *attr = &event->attr; + + if (!attr) { + ret = -EINVAL; + goto out; + } + + /* 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 |= BIT(4); + /* 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 |= BIT(11); + } + + if (attr->config & BIT(ETM_OPT_CTXTID)) + /* bit[6], Context ID tracing bit */ + config->cfg |= BIT(ETM4_CFG_BIT_CTXTID); + + /* return stack - enable if selected and supported */ + if ((attr->config & BIT(ETM_OPT_RETSTK)) && drvdata->retstack) + /* bit[12], Return stack enable bit */ + config->cfg |= BIT(12); + +out: + return ret; +} + +static int etm4_enable_perf(struct coresight_device *csdev, + struct perf_event *event) +{ + int ret = 0; + 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(drvdata, event); + if (ret) + goto out; + /* 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 = { }; + int ret; + + 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. + */ + 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; + 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 device *etm_dev = &drvdata->csdev->dev; + int i; + + CS_UNLOCK(drvdata->base); + + if (!drvdata->skip_power_up) { + /* power can be removed from the trace unit now */ + control = readl_relaxed(drvdata->base + TRCPDCR); + control &= ~TRCPDCR_PU; + writel_relaxed(control, drvdata->base + TRCPDCR); + } + + control = readl_relaxed(drvdata->base + TRCPRGCTLR); + + /* EN, bit[0] Trace unit enable bit */ + control &= ~0x1; + + /* + * 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(); + writel_relaxed(control, drvdata->base + TRCPRGCTLR); + + /* wait for TRCSTATR.PMSTABLE to go to '1' */ + if (coresight_timeout(drvdata->base, 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] = + readl_relaxed(drvdata->base + TRCSSCSRn(i)); + } + + /* read back the current counter values */ + for (i = 0; i < drvdata->nr_cntr; i++) { + config->cntr_val[i] = + readl_relaxed(drvdata->base + TRCCNTVRn(i)); + } + + coresight_disclaim_device_unlocked(drvdata->base); + + CS_LOCK(drvdata->base); + + 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); + + if (WARN_ON_ONCE(drvdata->cpu != smp_processor_id())) + return -EINVAL; + + etm4_disable_hw(drvdata); + + /* + * 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 = readl_relaxed(drvdata->base + TRCVICTLR); + /* TRCVICTLR::SSSTATUS, bit[9] */ + filters->ssstatus = (control & BIT(9)); + + 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(); + + 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, + .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 void etm4_init_arch_data(void *info) +{ + u32 etmidr0; + u32 etmidr1; + u32 etmidr2; + u32 etmidr3; + u32 etmidr4; + u32 etmidr5; + struct etmv4_drvdata *drvdata = info; + int i; + + /* Make sure all registers are accessible */ + etm4_os_unlock(drvdata); + + 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); + drvdata->config.arch = drvdata->arch; + + /* 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 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 = BMVAL(etmidr4, 16, 19); + if ((drvdata->arch < ETM4X_ARCH_4V3) || (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 = BMVAL(etmidr4, 20, 23); + for (i = 0; i < drvdata->nr_ss_cmp; i++) { + drvdata->config.ss_status[i] = + readl_relaxed(drvdata->base + TRCSSCSRn(i)); + } + /* 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); +} + +/* Set ELx trace filter access in the TRCVICTLR register */ +static void etm4_set_victlr_access(struct etmv4_config *config) +{ + u64 access_type; + + config->vinst_ctrl &= ~(ETM_EXLEVEL_S_VICTLR_MASK | ETM_EXLEVEL_NS_VICTLR_MASK); + + /* + * TRCVICTLR::EXLEVEL_NS:EXLEVELS: Set kernel / user filtering + * bits in vinst_ctrl, same bit pattern as TRCACATRn values returned by + * etm4_get_access_type() but with a relative shift in this register. + */ + access_type = etm4_get_access_type(config) << ETM_EXLEVEL_LSHIFT_TRCVICTLR; + config->vinst_ctrl |= (u32)access_type; +} + +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 = BIT(0); + + /* 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, bits[15:12] + * The Exception levels are: + * Bit[12] Exception level 0 - Application + * Bit[13] Exception level 1 - OS + * Bit[14] Exception level 2 - Hypervisor + * Bit[15] Never implemented + */ + 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; +} + +static u64 etm4_get_access_type(struct etmv4_config *config) +{ + u64 access_type = etm4_get_ns_access_type(config); + u64 s_hyp = (config->arch & 0x0f) >= 0x4 ? ETM_EXLEVEL_S_HYP : 0; + + /* + * EXLEVEL_S, bits[11:8], don't trace anything happening + * in secure state. + */ + access_type |= (ETM_EXLEVEL_S_APP | + ETM_EXLEVEL_S_OS | + s_hyp | + ETM_EXLEVEL_S_MON); + + return access_type; +} + +static void etm4_set_comparator_filter(struct etmv4_config *config, + u64 start, u64 stop, int comparator) +{ + u64 access_type = etm4_get_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_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 |= BIT(9); + 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 |= BIT(9); + + /* 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 + * 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 |= BIT(9); + + /* 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 0; + + 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; |