From 2e1cdfe184b5202d51e0611d7a051e2bea303946 Mon Sep 17 00:00:00 2001 From: Pratik Patel Date: Wed, 13 May 2015 10:34:09 -0600 Subject: [PATCH] coresight-etm4x: Adding CoreSight ETM4x driver This driver manages the CoreSight ETMv4 (Embedded Trace Macrocell) IP block to support HW assisted tracing on ARMv7 and ARMv8 architectures. Signed-off-by: Pratik Patel Signed-off-by: Kaixu Xia Signed-off-by: Mathieu Poirier Signed-off-by: Greg Kroah-Hartman --- .../ABI/testing/sysfs-bus-coresight-devices-etm4x | 15 + drivers/hwtracing/coresight/Kconfig | 11 + drivers/hwtracing/coresight/Makefile | 1 + drivers/hwtracing/coresight/coresight-etm4x.c | 697 +++++++++++++++++++++ drivers/hwtracing/coresight/coresight-etm4x.h | 391 ++++++++++++ 5 files changed, 1115 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x create mode 100644 drivers/hwtracing/coresight/coresight-etm4x.c create mode 100644 drivers/hwtracing/coresight/coresight-etm4x.h diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x b/Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x new file mode 100644 index 0000000..d1e5139 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x @@ -0,0 +1,15 @@ +What: /sys/bus/coresight/devices/.etm/enable_source +Date: April 2015 +KernelVersion: 4.01 +Contact: Mathieu Poirier +Description: (RW) Enable/disable tracing on this specific trace entiry. + Enabling a source implies the source has been configured + properly and a sink has been identidifed for it. The path + of coresight components linking the source to the sink is + configured and managed automatically by the coresight framework. + +What: /sys/bus/coresight/devices/.etm/cpu +Date: April 2015 +KernelVersion: 4.01 +Contact: Mathieu Poirier +Description: (R) The CPU this tracing entity is associated with. diff --git a/drivers/hwtracing/coresight/Kconfig b/drivers/hwtracing/coresight/Kconfig index fc1f1ae..8fac01e 100644 --- a/drivers/hwtracing/coresight/Kconfig +++ b/drivers/hwtracing/coresight/Kconfig @@ -58,4 +58,15 @@ config CORESIGHT_SOURCE_ETM3X which allows tracing the instructions that a processor is executing This is primarily useful for instruction level tracing. Depending the ETM version data tracing may also be available. + +config CORESIGHT_SOURCE_ETM4X + bool "CoreSight Embedded Trace Macrocell 4.x driver" + depends on ARM64 + select CORESIGHT_LINKS_AND_SINKS + help + This driver provides support for the ETM4.x tracer module, tracing the + instructions that a processor is executing. This is primarily useful + for instruction level tracing. Depending on the implemented version + data tracing may also be available. + endif diff --git a/drivers/hwtracing/coresight/Makefile b/drivers/hwtracing/coresight/Makefile index 4b4bec8..0af28d4 100644 --- a/drivers/hwtracing/coresight/Makefile +++ b/drivers/hwtracing/coresight/Makefile @@ -9,3 +9,4 @@ obj-$(CONFIG_CORESIGHT_SINK_ETBV10) += coresight-etb10.o obj-$(CONFIG_CORESIGHT_LINKS_AND_SINKS) += coresight-funnel.o \ coresight-replicator.o obj-$(CONFIG_CORESIGHT_SOURCE_ETM3X) += coresight-etm3x.o coresight-etm-cp14.o +obj-$(CONFIG_CORESIGHT_SOURCE_ETM4X) += coresight-etm4x.o diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c new file mode 100644 index 0000000..169d801 --- /dev/null +++ b/drivers/hwtracing/coresight/coresight-etm4x.c @@ -0,0 +1,697 @@ +/* Copyright (c) 2014, The Linux Foundation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "coresight-etm4x.h" + +static int boot_enable; +module_param_named(boot_enable, boot_enable, int, S_IRUGO); + +/* The number of ETMv4 currently registered */ +static int etm4_count; +static struct etmv4_drvdata *etmdrvdata[NR_CPUS]; + +static void etm4_os_unlock(void *info) +{ + struct etmv4_drvdata *drvdata = (struct etmv4_drvdata *)info; + + /* Writing any value to ETMOSLAR unlocks the trace registers */ + writel_relaxed(0x0, drvdata->base + TRCOSLAR); + isb(); +} + +static bool etm4_arch_supported(u8 arch) +{ + switch (arch) { + case ETM_ARCH_V4: + break; + default: + return false; + } + return true; +} + +static int etm4_trace_id(struct coresight_device *csdev) +{ + struct etmv4_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); + unsigned long flags; + int trace_id = -1; + + if (!drvdata->enable) + return drvdata->trcid; + + pm_runtime_get_sync(drvdata->dev); + spin_lock_irqsave(&drvdata->spinlock, flags); + + CS_UNLOCK(drvdata->base); + trace_id = readl_relaxed(drvdata->base + TRCTRACEIDR); + trace_id &= ETM_TRACEID_MASK; + CS_LOCK(drvdata->base); + + spin_unlock_irqrestore(&drvdata->spinlock, flags); + pm_runtime_put(drvdata->dev); + + return trace_id; +} + +static void etm4_enable_hw(void *info) +{ + int i; + struct etmv4_drvdata *drvdata = info; + + CS_UNLOCK(drvdata->base); + + etm4_os_unlock(drvdata); + + /* Disable the trace unit before programming trace registers */ + writel_relaxed(0, drvdata->base + TRCPRGCTLR); + + /* wait for TRCSTATR.IDLE to go up */ + if (coresight_timeout(drvdata->base, TRCSTATR, TRCSTATR_IDLE_BIT, 1)) + dev_err(drvdata->dev, + "timeout observed when probing at offset %#x\n", + TRCSTATR); + + writel_relaxed(drvdata->pe_sel, drvdata->base + TRCPROCSELR); + writel_relaxed(drvdata->cfg, drvdata->base + TRCCONFIGR); + /* nothing specific implemented */ + writel_relaxed(0x0, drvdata->base + TRCAUXCTLR); + writel_relaxed(drvdata->eventctrl0, drvdata->base + TRCEVENTCTL0R); + writel_relaxed(drvdata->eventctrl1, drvdata->base + TRCEVENTCTL1R); + writel_relaxed(drvdata->stall_ctrl, drvdata->base + TRCSTALLCTLR); + writel_relaxed(drvdata->ts_ctrl, drvdata->base + TRCTSCTLR); + writel_relaxed(drvdata->syncfreq, drvdata->base + TRCSYNCPR); + writel_relaxed(drvdata->ccctlr, drvdata->base + TRCCCCTLR); + writel_relaxed(drvdata->bb_ctrl, drvdata->base + TRCBBCTLR); + writel_relaxed(drvdata->trcid, drvdata->base + TRCTRACEIDR); + writel_relaxed(drvdata->vinst_ctrl, drvdata->base + TRCVICTLR); + writel_relaxed(drvdata->viiectlr, drvdata->base + TRCVIIECTLR); + writel_relaxed(drvdata->vissctlr, + drvdata->base + TRCVISSCTLR); + writel_relaxed(drvdata->vipcssctlr, + drvdata->base + TRCVIPCSSCTLR); + for (i = 0; i < drvdata->nrseqstate - 1; i++) + writel_relaxed(drvdata->seq_ctrl[i], + drvdata->base + TRCSEQEVRn(i)); + writel_relaxed(drvdata->seq_rst, drvdata->base + TRCSEQRSTEVR); + writel_relaxed(drvdata->seq_state, drvdata->base + TRCSEQSTR); + writel_relaxed(drvdata->ext_inp, drvdata->base + TRCEXTINSELR); + for (i = 0; i < drvdata->nr_cntr; i++) { + writel_relaxed(drvdata->cntrldvr[i], + drvdata->base + TRCCNTRLDVRn(i)); + writel_relaxed(drvdata->cntr_ctrl[i], + drvdata->base + TRCCNTCTLRn(i)); + writel_relaxed(drvdata->cntr_val[i], + drvdata->base + TRCCNTVRn(i)); + } + for (i = 0; i < drvdata->nr_resource; i++) + writel_relaxed(drvdata->res_ctrl[i], + drvdata->base + TRCRSCTLRn(i)); + + for (i = 0; i < drvdata->nr_ss_cmp; i++) { + writel_relaxed(drvdata->ss_ctrl[i], + drvdata->base + TRCSSCCRn(i)); + writel_relaxed(drvdata->ss_status[i], + drvdata->base + TRCSSCSRn(i)); + writel_relaxed(drvdata->ss_pe_cmp[i], + drvdata->base + TRCSSPCICRn(i)); + } + for (i = 0; i < drvdata->nr_addr_cmp; i++) { + writeq_relaxed(drvdata->addr_val[i], + drvdata->base + TRCACVRn(i)); + writeq_relaxed(drvdata->addr_acc[i], + drvdata->base + TRCACATRn(i)); + } + for (i = 0; i < drvdata->numcidc; i++) + writeq_relaxed(drvdata->ctxid_val[i], + drvdata->base + TRCCIDCVRn(i)); + writel_relaxed(drvdata->ctxid_mask0, drvdata->base + TRCCIDCCTLR0); + writel_relaxed(drvdata->ctxid_mask1, drvdata->base + TRCCIDCCTLR1); + + for (i = 0; i < drvdata->numvmidc; i++) + writeq_relaxed(drvdata->vmid_val[i], + drvdata->base + TRCVMIDCVRn(i)); + writel_relaxed(drvdata->vmid_mask0, drvdata->base + TRCVMIDCCTLR0); + writel_relaxed(drvdata->vmid_mask1, drvdata->base + TRCVMIDCCTLR1); + + /* Enable the trace unit */ + writel_relaxed(1, drvdata->base + TRCPRGCTLR); + + /* wait for TRCSTATR.IDLE to go back down to '0' */ + if (coresight_timeout(drvdata->base, TRCSTATR, TRCSTATR_IDLE_BIT, 0)) + dev_err(drvdata->dev, + "timeout observed when probing at offset %#x\n", + TRCSTATR); + + CS_LOCK(drvdata->base); + + dev_dbg(drvdata->dev, "cpu: %d enable smp call done\n", drvdata->cpu); +} + +static int etm4_enable(struct coresight_device *csdev) +{ + struct etmv4_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); + int ret; + + pm_runtime_get_sync(drvdata->dev); + spin_lock(&drvdata->spinlock); + + /* + * Executing etm4_enable_hw on the cpu whose ETM is being enabled + * ensures that register writes occur when cpu is powered. + */ + ret = smp_call_function_single(drvdata->cpu, + etm4_enable_hw, drvdata, 1); + if (ret) + goto err; + drvdata->enable = true; + drvdata->sticky_enable = true; + + spin_unlock(&drvdata->spinlock); + + dev_info(drvdata->dev, "ETM tracing enabled\n"); + return 0; +err: + spin_unlock(&drvdata->spinlock); + pm_runtime_put(drvdata->dev); + return ret; +} + +static void etm4_disable_hw(void *info) +{ + u32 control; + struct etmv4_drvdata *drvdata = info; + + CS_UNLOCK(drvdata->base); + + control = readl_relaxed(drvdata->base + TRCPRGCTLR); + + /* EN, bit[0] Trace unit enable bit */ + control &= ~0x1; + + /* make sure everything completes before disabling */ + mb(); + isb(); + writel_relaxed(control, drvdata->base + TRCPRGCTLR); + + CS_LOCK(drvdata->base); + + dev_dbg(drvdata->dev, "cpu: %d disable smp call done\n", drvdata->cpu); +} + +static void etm4_disable(struct coresight_device *csdev) +{ + struct etmv4_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); + + /* + * Taking hotplug lock here protects from clocks getting disabled + * with tracing being left on (crash scenario) if user disable occurs + * after cpu online mask indicates the cpu is offline but before the + * DYING hotplug callback is serviced by the ETM driver. + */ + get_online_cpus(); + spin_lock(&drvdata->spinlock); + + /* + * Executing etm4_disable_hw on the cpu whose ETM is being disabled + * ensures that register writes occur when cpu is powered. + */ + smp_call_function_single(drvdata->cpu, etm4_disable_hw, drvdata, 1); + drvdata->enable = false; + + spin_unlock(&drvdata->spinlock); + put_online_cpus(); + + pm_runtime_put(drvdata->dev); + + dev_info(drvdata->dev, "ETM tracing disabled\n"); +} + +static const struct coresight_ops_source etm4_source_ops = { + .trace_id = etm4_trace_id, + .enable = etm4_enable, + .disable = etm4_disable, +}; + +static const struct coresight_ops etm4_cs_ops = { + .source_ops = &etm4_source_ops, +}; + +static ssize_t cpu_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + int val; + struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent); + + val = drvdata->cpu; + return scnprintf(buf, PAGE_SIZE, "%d\n", val); + +} +static DEVICE_ATTR_RO(cpu); + +static struct attribute *coresight_etmv4_attrs[] = { + &dev_attr_cpu.attr, + NULL, +}; +ATTRIBUTE_GROUPS(coresight_etmv4); + +static void etm4_init_arch_data(void *info) +{ + u32 etmidr0; + u32 etmidr1; + u32 etmidr2; + u32 etmidr3; + u32 etmidr4; + u32 etmidr5; + struct etmv4_drvdata *drvdata = info; + + CS_UNLOCK(drvdata->base); + + /* find all capabilities of the tracing unit */ + etmidr0 = readl_relaxed(drvdata->base + TRCIDR0); + + /* INSTP0, bits[2:1] P0 tracing support field */ + if (BMVAL(etmidr0, 1, 1) && BMVAL(etmidr0, 2, 2)) + drvdata->instrp0 = true; + else + drvdata->instrp0 = false; + + /* TRCBB, bit[5] Branch broadcast tracing support bit */ + if (BMVAL(etmidr0, 5, 5)) + drvdata->trcbb = true; + else + drvdata->trcbb = false; + + /* TRCCOND, bit[6] Conditional instruction tracing support bit */ + if (BMVAL(etmidr0, 6, 6)) + drvdata->trccond = true; + else + drvdata->trccond = false; + + /* TRCCCI, bit[7] Cycle counting instruction bit */ + if (BMVAL(etmidr0, 7, 7)) + drvdata->trccci = true; + else + drvdata->trccci = false; + + /* RETSTACK, bit[9] Return stack bit */ + if (BMVAL(etmidr0, 9, 9)) + drvdata->retstack = true; + else + drvdata->retstack = false; + + /* NUMEVENT, bits[11:10] Number of events field */ + drvdata->nr_event = BMVAL(etmidr0, 10, 11); + /* QSUPP, bits[16:15] Q element support field */ + drvdata->q_support = BMVAL(etmidr0, 15, 16); + /* TSSIZE, bits[28:24] Global timestamp size field */ + drvdata->ts_size = BMVAL(etmidr0, 24, 28); + + /* base architecture of trace unit */ + etmidr1 = readl_relaxed(drvdata->base + TRCIDR1); + /* + * TRCARCHMIN, bits[7:4] architecture the minor version number + * TRCARCHMAJ, bits[11:8] architecture major versin number + */ + drvdata->arch = BMVAL(etmidr1, 4, 11); + + /* maximum size of resources */ + etmidr2 = readl_relaxed(drvdata->base + TRCIDR2); + /* CIDSIZE, bits[9:5] Indicates the Context ID size */ + drvdata->ctxid_size = BMVAL(etmidr2, 5, 9); + /* VMIDSIZE, bits[14:10] Indicates the VMID size */ + drvdata->vmid_size = BMVAL(etmidr2, 10, 14); + /* CCSIZE, bits[28:25] size of the cycle counter in bits minus 12 */ + drvdata->ccsize = BMVAL(etmidr2, 25, 28); + + etmidr3 = readl_relaxed(drvdata->base + TRCIDR3); + /* CCITMIN, bits[11:0] minimum threshold value that can be programmed */ + drvdata->ccitmin = BMVAL(etmidr3, 0, 11); + /* EXLEVEL_S, bits[19:16] Secure state instruction tracing */ + drvdata->s_ex_level = BMVAL(etmidr3, 16, 19); + /* EXLEVEL_NS, bits[23:20] Non-secure state instruction tracing */ + drvdata->ns_ex_level = BMVAL(etmidr3, 20, 23); + + /* + * TRCERR, bit[24] whether a trace unit can trace a + * system error exception. + */ + if (BMVAL(etmidr3, 24, 24)) + drvdata->trc_error = true; + else + drvdata->trc_error = false; + + /* SYNCPR, bit[25] implementation has a fixed synchronization period? */ + if (BMVAL(etmidr3, 25, 25)) + drvdata->syncpr = true; + else + drvdata->syncpr = false; + + /* STALLCTL, bit[26] is stall control implemented? */ + if (BMVAL(etmidr3, 26, 26)) + drvdata->stallctl = true; + else + drvdata->stallctl = false; + + /* SYSSTALL, bit[27] implementation can support stall control? */ + if (BMVAL(etmidr3, 27, 27)) + drvdata->sysstall = true; + else + drvdata->sysstall = false; + + /* NUMPROC, bits[30:28] the number of PEs available for tracing */ + drvdata->nr_pe = BMVAL(etmidr3, 28, 30); + + /* NOOVERFLOW, bit[31] is trace overflow prevention supported */ + if (BMVAL(etmidr3, 31, 31)) + drvdata->nooverflow = true; + else + drvdata->nooverflow = false; + + /* number of resources trace unit supports */ + etmidr4 = readl_relaxed(drvdata->base + TRCIDR4); + /* NUMACPAIRS, bits[0:3] number of addr comparator pairs for tracing */ + drvdata->nr_addr_cmp = BMVAL(etmidr4, 0, 3); + /* NUMPC, bits[15:12] number of PE comparator inputs for tracing */ + drvdata->nr_pe_cmp = BMVAL(etmidr4, 12, 15); + /* NUMRSPAIR, bits[19:16] the number of resource pairs for tracing */ + drvdata->nr_resource = BMVAL(etmidr4, 16, 19); + /* + * NUMSSCC, bits[23:20] the number of single-shot + * comparator control for tracing + */ + drvdata->nr_ss_cmp = BMVAL(etmidr4, 20, 23); + /* NUMCIDC, bits[27:24] number of Context ID comparators for tracing */ + drvdata->numcidc = BMVAL(etmidr4, 24, 27); + /* NUMVMIDC, bits[31:28] number of VMID comparators for tracing */ + drvdata->numvmidc = BMVAL(etmidr4, 28, 31); + + etmidr5 = readl_relaxed(drvdata->base + TRCIDR5); + /* NUMEXTIN, bits[8:0] number of external inputs implemented */ + drvdata->nr_ext_inp = BMVAL(etmidr5, 0, 8); + /* TRACEIDSIZE, bits[21:16] indicates the trace ID width */ + drvdata->trcid_size = BMVAL(etmidr5, 16, 21); + /* ATBTRIG, bit[22] implementation can support ATB triggers? */ + if (BMVAL(etmidr5, 22, 22)) + drvdata->atbtrig = true; + else + drvdata->atbtrig = false; + /* + * LPOVERRIDE, bit[23] implementation supports + * low-power state override + */ + if (BMVAL(etmidr5, 23, 23)) + drvdata->lpoverride = true; + else + drvdata->lpoverride = false; + /* NUMSEQSTATE, bits[27:25] number of sequencer states implemented */ + drvdata->nrseqstate = BMVAL(etmidr5, 25, 27); + /* NUMCNTR, bits[30:28] number of counters available for tracing */ + drvdata->nr_cntr = BMVAL(etmidr5, 28, 30); + CS_LOCK(drvdata->base); +} + +static void etm4_init_default_data(struct etmv4_drvdata *drvdata) +{ + int i; + + drvdata->pe_sel = 0x0; + drvdata->cfg = (ETMv4_MODE_CTXID | ETM_MODE_VMID | + ETMv4_MODE_TIMESTAMP | ETM_MODE_RETURNSTACK); + + /* disable all events tracing */ + drvdata->eventctrl0 = 0x0; + drvdata->eventctrl1 = 0x0; + + /* disable stalling */ + drvdata->stall_ctrl = 0x0; + + /* disable timestamp event */ + drvdata->ts_ctrl = 0x0; + + /* enable trace synchronization every 4096 bytes for trace */ + if (drvdata->syncpr == false) + drvdata->syncfreq = 0xC; + + /* + * enable viewInst to trace everything with start-stop logic in + * started state + */ + drvdata->vinst_ctrl |= BIT(0); + /* set initial state of start-stop logic */ + if (drvdata->nr_addr_cmp) + drvdata->vinst_ctrl |= BIT(9); + + /* no address range filtering for ViewInst */ + drvdata->viiectlr = 0x0; + /* no start-stop filtering for ViewInst */ + drvdata->vissctlr = 0x0; + + /* disable seq events */ + for (i = 0; i < drvdata->nrseqstate-1; i++) + drvdata->seq_ctrl[i] = 0x0; + drvdata->seq_rst = 0x0; + drvdata->seq_state = 0x0; + + /* disable external input events */ + drvdata->ext_inp = 0x0; + + for (i = 0; i < drvdata->nr_cntr; i++) { + drvdata->cntrldvr[i] = 0x0; + drvdata->cntr_ctrl[i] = 0x0; + drvdata->cntr_val[i] = 0x0; + } + + for (i = 2; i < drvdata->nr_resource * 2; i++) + drvdata->res_ctrl[i] = 0x0; + + for (i = 0; i < drvdata->nr_ss_cmp; i++) { + drvdata->ss_ctrl[i] = 0x0; + drvdata->ss_pe_cmp[i] = 0x0; + } + + if (drvdata->nr_addr_cmp >= 1) { + drvdata->addr_val[0] = (unsigned long)_stext; + drvdata->addr_val[1] = (unsigned long)_etext; + drvdata->addr_type[0] = ETM_ADDR_TYPE_RANGE; + drvdata->addr_type[1] = ETM_ADDR_TYPE_RANGE; + } + + for (i = 0; i < drvdata->numcidc; i++) + drvdata->ctxid_val[i] = 0x0; + drvdata->ctxid_mask0 = 0x0; + drvdata->ctxid_mask1 = 0x0; + + for (i = 0; i < drvdata->numvmidc; i++) + drvdata->vmid_val[i] = 0x0; + drvdata->vmid_mask0 = 0x0; + drvdata->vmid_mask1 = 0x0; + + /* + * A trace ID value of 0 is invalid, so let's start at some + * random value that fits in 7 bits. ETMv3.x has 0x10 so let's + * start at 0x20. + */ + drvdata->trcid = 0x20 + drvdata->cpu; +} + +static int etm4_cpu_callback(struct notifier_block *nfb, unsigned long action, + void *hcpu) +{ + unsigned int cpu = (unsigned long)hcpu; + + if (!etmdrvdata[cpu]) + goto out; + + switch (action & (~CPU_TASKS_FROZEN)) { + case CPU_STARTING: + spin_lock(&etmdrvdata[cpu]->spinlock); + if (!etmdrvdata[cpu]->os_unlock) { + etm4_os_unlock(etmdrvdata[cpu]); + etmdrvdata[cpu]->os_unlock = true; + } + + if (etmdrvdata[cpu]->enable) + etm4_enable_hw(etmdrvdata[cpu]); + spin_unlock(&etmdrvdata[cpu]->spinlock); + break; + + case CPU_ONLINE: + if (etmdrvdata[cpu]->boot_enable && + !etmdrvdata[cpu]->sticky_enable) + coresight_enable(etmdrvdata[cpu]->csdev); + break; + + case CPU_DYING: + spin_lock(&etmdrvdata[cpu]->spinlock); + if (etmdrvdata[cpu]->enable) + etm4_disable_hw(etmdrvdata[cpu]); + spin_unlock(&etmdrvdata[cpu]->spinlock); + break; + } +out: + return NOTIFY_OK; +} + +static struct notifier_block etm4_cpu_notifier = { + .notifier_call = etm4_cpu_callback, +}; + +static int etm4_probe(struct amba_device *adev, const struct amba_id *id) +{ + int ret; + void __iomem *base; + struct device *dev = &adev->dev; + struct coresight_platform_data *pdata = NULL; + struct etmv4_drvdata *drvdata; + struct resource *res = &adev->res; + struct coresight_desc *desc; + struct device_node *np = adev->dev.of_node; + + desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL); + if (!desc) + return -ENOMEM; + + drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL); + if (!drvdata) + return -ENOMEM; + + if (np) { + pdata = of_get_coresight_platform_data(dev, np); + if (IS_ERR(pdata)) + return PTR_ERR(pdata); + adev->dev.platform_data = pdata; + } + + drvdata->dev = &adev->dev; + dev_set_drvdata(dev, drvdata); + + /* Validity for the resource is already checked by the AMBA core */ + base = devm_ioremap_resource(dev, res); + if (IS_ERR(base)) + return PTR_ERR(base); + + drvdata->base = base; + + spin_lock_init(&drvdata->spinlock); + + drvdata->cpu = pdata ? pdata->cpu : 0; + + get_online_cpus(); + etmdrvdata[drvdata->cpu] = drvdata; + + if (!smp_call_function_single(drvdata->cpu, etm4_os_unlock, drvdata, 1)) + drvdata->os_unlock = true; + + if (smp_call_function_single(drvdata->cpu, + etm4_init_arch_data, drvdata, 1)) + dev_err(dev, "ETM arch init failed\n"); + + if (!etm4_count++) + register_hotcpu_notifier(&etm4_cpu_notifier); + + put_online_cpus(); + + if (etm4_arch_supported(drvdata->arch) == false) { + ret = -EINVAL; + goto err_arch_supported; + } + etm4_init_default_data(drvdata); + + pm_runtime_put(&adev->dev); + + desc->type = CORESIGHT_DEV_TYPE_SOURCE; + desc->subtype.source_subtype = CORESIGHT_DEV_SUBTYPE_SOURCE_PROC; + desc->ops = &etm4_cs_ops; + desc->pdata = pdata; + desc->dev = dev; + desc->groups = coresight_etmv4_groups; + drvdata->csdev = coresight_register(desc); + if (IS_ERR(drvdata->csdev)) { + ret = PTR_ERR(drvdata->csdev); + goto err_coresight_register; + } + + dev_info(dev, "%s initialized\n", (char *)id->data); + + if (boot_enable) { + coresight_enable(drvdata->csdev); + drvdata->boot_enable = true; + } + + return 0; + +err_arch_supported: + pm_runtime_put(&adev->dev); +err_coresight_register: + if (--etm4_count == 0) + unregister_hotcpu_notifier(&etm4_cpu_notifier); + return ret; +} + +static int etm4_remove(struct amba_device *adev) +{ + struct etmv4_drvdata *drvdata = amba_get_drvdata(adev); + + coresight_unregister(drvdata->csdev); + if (--etm4_count == 0) + unregister_hotcpu_notifier(&etm4_cpu_notifier); + + return 0; +} + +static struct amba_id etm4_ids[] = { + { /* ETM 4.0 - Qualcomm */ + .id = 0x0003b95d, + .mask = 0x0003ffff, + .data = "ETM 4.0", + }, + { /* ETM 4.0 - Juno board */ + .id = 0x000bb95e, + .mask = 0x000fffff, + .data = "ETM 4.0", + }, + { 0, 0}, +}; + +static struct amba_driver etm4x_driver = { + .drv = { + .name = "coresight-etm4x", + }, + .probe = etm4_probe, + .remove = etm4_remove, + .id_table = etm4_ids, +}; + +module_amba_driver(etm4x_driver); diff --git a/drivers/hwtracing/coresight/coresight-etm4x.h b/drivers/hwtracing/coresight/coresight-etm4x.h new file mode 100644 index 0000000..e08e983 --- /dev/null +++ b/drivers/hwtracing/coresight/coresight-etm4x.h @@ -0,0 +1,391 @@ +/* Copyright (c) 2014-2015, The Linux Foundation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#ifndef _CORESIGHT_CORESIGHT_ETM_H +#define _CORESIGHT_CORESIGHT_ETM_H + +#include +#include "coresight-priv.h" + +/* + * Device registers: + * 0x000 - 0x2FC: Trace registers + * 0x300 - 0x314: Management registers + * 0x318 - 0xEFC: Trace registers + * 0xF00: Management registers + * 0xFA0 - 0xFA4: Trace registers + * 0xFA8 - 0xFFC: Management registers + */ +/* Trace registers (0x000-0x2FC) */ +/* Main control and configuration registers */ +#define TRCPRGCTLR 0x004 +#define TRCPROCSELR 0x008 +#define TRCSTATR 0x00C +#define TRCCONFIGR 0x010 +#define TRCAUXCTLR 0x018 +#define TRCEVENTCTL0R 0x020 +#define TRCEVENTCTL1R 0x024 +#define TRCSTALLCTLR 0x02C +#define TRCTSCTLR 0x030 +#define TRCSYNCPR 0x034 +#define TRCCCCTLR 0x038 +#define TRCBBCTLR 0x03C +#define TRCTRACEIDR 0x040 +#define TRCQCTLR 0x044 +/* Filtering control registers */ +#define TRCVICTLR 0x080 +#define TRCVIIECTLR 0x084 +#define TRCVISSCTLR 0x088 +#define TRCVIPCSSCTLR 0x08C +#define TRCVDCTLR 0x0A0 +#define TRCVDSACCTLR 0x0A4 +#define TRCVDARCCTLR 0x0A8 +/* Derived resources registers */ +#define TRCSEQEVRn(n) (0x100 + (n * 4)) +#define TRCSEQRSTEVR 0x118 +#define TRCSEQSTR 0x11C +#define TRCEXTINSELR 0x120 +#define TRCCNTRLDVRn(n) (0x140 + (n * 4)) +#define TRCCNTCTLRn(n) (0x150 + (n * 4)) +#define TRCCNTVRn(n) (0x160 + (n * 4)) +/* ID registers */ +#define TRCIDR8 0x180 +#define TRCIDR9 0x184 +#define TRCIDR10 0x188 +#define TRCIDR11 0x18C +#define TRCIDR12 0x190 +#define TRCIDR13 0x194 +#define TRCIMSPEC0 0x1C0 +#define TRCIMSPECn(n) (0x1C0 + (n * 4)) +#define TRCIDR0 0x1E0 +#define TRCIDR1 0x1E4 +#define TRCIDR2 0x1E8 +#define TRCIDR3 0x1EC +#define TRCIDR4 0x1F0 +#define TRCIDR5 0x1F4 +#define TRCIDR6 0x1F8 +#define TRCIDR7 0x1FC +/* Resource selection registers */ +#define TRCRSCTLRn(n) (0x200 + (n * 4)) +/* Single-shot comparator registers */ +#define TRCSSCCRn(n) (0x280 + (n * 4)) +#define TRCSSCSRn(n) (0x2A0 + (n * 4)) +#define TRCSSPCICRn(n) (0x2C0 + (n * 4)) +/* Management registers (0x300-0x314) */ +#define TRCOSLAR 0x300 +#define TRCOSLSR 0x304 +#define TRCPDCR 0x310 +#define TRCPDSR 0x314 +/* Trace registers (0x318-0xEFC) */ +/* Comparator registers */ +#define TRCACVRn(n) (0x400 + (n * 8)) +#define TRCACATRn(n) (0x480 + (n * 8)) +#define TRCDVCVRn(n) (0x500 + (n * 16)) +#define TRCDVCMRn(n) (0x580 + (n * 16)) +#define TRCCIDCVRn(n) (0x600 + (n * 8)) +#define TRCVMIDCVRn(n) (0x640 + (n * 8)) +#define TRCCIDCCTLR0 0x680 +#define TRCCIDCCTLR1 0x684 +#define TRCVMIDCCTLR0 0x688 +#define TRCVMIDCCTLR1 0x68C +/* Management register (0xF00) */ +/* Integration control registers */ +#define TRCITCTRL 0xF00 +/* Trace registers (0xFA0-0xFA4) */ +/* Claim tag registers */ +#define TRCCLAIMSET 0xFA0 +#define TRCCLAIMCLR 0xFA4 +/* Management registers (0xFA8-0xFFC) */ +#define TRCDEVAFF0 0xFA8 +#define TRCDEVAFF1 0xFAC +#define TRCLAR 0xFB0 +#define TRCLSR 0xFB4 +#define TRCAUTHSTATUS 0xFB8 +#define TRCDEVARCH 0xFBC +#define TRCDEVID 0xFC8 +#define TRCDEVTYPE 0xFCC +#define TRCPIDR4 0xFD0 +#define TRCPIDR5 0xFD4 +#define TRCPIDR6 0xFD8 +#define TRCPIDR7 0xFDC +#define TRCPIDR0 0xFE0 +#define TRCPIDR1 0xFE4 +#define TRCPIDR2 0xFE8 +#define TRCPIDR3 0xFEC +#define TRCCIDR0 0xFF0 +#define TRCCIDR1 0xFF4 +#define TRCCIDR2 0xFF8 +#define TRCCIDR3 0xFFC + +/* ETMv4 resources */ +#define ETM_MAX_NR_PE 8 +#define ETMv4_MAX_CNTR 4 +#define ETM_MAX_SEQ_STATES 4 +#define ETM_MAX_EXT_INP_SEL 4 +#define ETM_MAX_EXT_INP 256 +#define ETM_MAX_EXT_OUT 4 +#define ETM_MAX_SINGLE_ADDR_CMP 16 +#define ETM_MAX_ADDR_RANGE_CMP (ETM_MAX_SINGLE_ADDR_CMP / 2) +#define ETM_MAX_DATA_VAL_CMP 8 +#define ETMv4_MAX_CTXID_CMP 8 +#define ETM_MAX_VMID_CMP 8 +#define ETM_MAX_PE_CMP 8 +#define ETM_MAX_RES_SEL 16 +#define ETM_MAX_SS_CMP 8 + +#define ETM_ARCH_V4 0x40 +#define ETMv4_SYNC_MASK 0x1F +#define ETM_CYC_THRESHOLD_MASK 0xFFF +#define ETMv4_EVENT_MASK 0xFF +#define ETM_CNTR_MAX_VAL 0xFFFF +#define ETM_TRACEID_MASK 0x3f + +/* ETMv4 programming modes */ +#define ETM_MODE_EXCLUDE BIT(0) +#define ETM_MODE_LOAD BIT(1) +#define ETM_MODE_STORE BIT(2) +#define ETM_MODE_LOAD_STORE BIT(3) +#define ETM_MODE_BB BIT(4) +#define ETMv4_MODE_CYCACC BIT(5) +#define ETMv4_MODE_CTXID BIT(6) +#define ETM_MODE_VMID BIT(7) +#define ETM_MODE_COND(val) BMVAL(val, 8, 10) +#define ETMv4_MODE_TIMESTAMP BIT(11) +#define ETM_MODE_RETURNSTACK BIT(12) +#define ETM_MODE_QELEM(val) BMVAL(val, 13, 14) +#define ETM_MODE_DATA_TRACE_ADDR BIT(15) +#define ETM_MODE_DATA_TRACE_VAL BIT(16) +#define ETM_MODE_ISTALL BIT(17) +#define ETM_MODE_DSTALL BIT(18) +#define ETM_MODE_ATB_TRIGGER BIT(19) +#define ETM_MODE_LPOVERRIDE BIT(20) +#define ETM_MODE_ISTALL_EN BIT(21) +#define ETM_MODE_DSTALL_EN BIT(22) +#define ETM_MODE_INSTPRIO BIT(23) +#define ETM_MODE_NOOVERFLOW BIT(24) +#define ETM_MODE_TRACE_RESET BIT(25) +#define ETM_MODE_TRACE_ERR BIT(26) +#define ETM_MODE_VIEWINST_STARTSTOP BIT(27) +#define ETMv4_MODE_ALL 0xFFFFFFF + +#define TRCSTATR_IDLE_BIT 0 + +/** + * struct etm4_drvdata - specifics associated to an ETM component + * @base: Memory mapped base address for this component. + * @dev: The device entity associated to this component. + * @csdev: Component vitals needed by the framework. + * @spinlock: Only one at a time pls. + * @cpu: The cpu this component is affined to. + * @arch: ETM version number. + * @enable: Is this ETM currently tracing. + * @sticky_enable: true if ETM base configuration has been done. + * @boot_enable:True if we should start tracing at boot time. + * @os_unlock: True if access to management registers is allowed. + * @nr_pe: The number of processing entity available for tracing. + * @nr_pe_cmp: The number of processing entity comparator inputs that are + * available for tracing. + * @nr_addr_cmp:Number of pairs of address comparators available + * as found in ETMIDR4 0-3. + * @nr_cntr: Number of counters as found in ETMIDR5 bit 28-30. + * @nr_ext_inp: Number of external input. + * @numcidc: Number of contextID comparators. + * @numvmidc: Number of VMID comparators. + * @nrseqstate: The number of sequencer states that are implemented. + * @nr_event: Indicates how many events the trace unit support. + * @nr_resource:The number of resource selection pairs available for tracing. + * @nr_ss_cmp: Number of single-shot comparator controls that are available. + * @mode: Controls various modes supported by this ETM. + * @trcid: value of the current ID for this component. + * @trcid_size: Indicates the trace ID width. + * @instrp0: Tracing of load and store instructions + * as P0 elements is supported. + * @trccond: If the trace unit supports conditional + * instruction tracing. + * @retstack: Indicates if the implementation supports a return stack. + * @trc_error: Whether a trace unit can trace a system + * error exception. + * @atbtrig: If the implementation can support ATB triggers + * @lpoverride: If the implementation can support low-power state over. + * @pe_sel: Controls which PE to trace. + * @cfg: Controls the tracing options. + * @eventctrl0: Controls the tracing of arbitrary events. + * @eventctrl1: Controls the behavior of the events that @event_ctrl0 selects. + * @stallctl: If functionality that prevents trace unit buffer overflows + * is available. + * @sysstall: Does the system support stall control of the PE? + * @nooverflow: Indicate if overflow prevention is supported. + * @stall_ctrl: Enables trace unit functionality that prevents trace + * unit buffer overflows. + * @ts_size: Global timestamp size field. + * @ts_ctrl: Controls the insertion of global timestamps in the + * trace streams. + * @syncpr: Indicates if an implementation has a fixed + * synchronization period. + * @syncfreq: Controls how often trace synchronization requests occur. + * @trccci: Indicates if the trace unit supports cycle counting + * for instruction. + * @ccsize: Indicates the size of the cycle counter in bits. + * @ccitmin: minimum value that can be programmed in + * the TRCCCCTLR register. + * @ccctlr: Sets the threshold value for cycle counting. + * @trcbb: Indicates if the trace unit supports branch broadcast tracing. + * @q_support: Q element support characteristics. + * @vinst_ctrl: Controls instruction trace filtering. + * @viiectlr: Set or read, the address range comparators. + * @vissctlr: Set, or read, the single address comparators that control the + * ViewInst start-stop logic. + * @vipcssctlr: Set, or read, which PE comparator inputs can control the + * ViewInst start-stop logic. + * @seq_idx: Sequencor index selector. + * @seq_ctrl: Control for the sequencer state transition control register. + * @seq_rst: Moves the sequencer to state 0 when a programmed event occurs. + * @seq_state: Set, or read the sequencer state. + * @cntr_idx: Counter index seletor. + * @cntrldvr: Sets or returns the reload count value for a counter. + * @cntr_ctrl: Controls the operation of a counter. + * @cntr_val: Sets or returns the value for a counter. + * @res_idx: Resource index selector. + * @res_ctrl: Controls the selection of the resources in the trace unit. + * @ss_ctrl: Controls the corresponding single-shot comparator resource. + * @ss_status: The status of the corresponding single-shot comparator. + * @ss_pe_cmp: Selects the PE comparator inputs for Single-shot control. + * @addr_idx: Address comparator index selector. + * @addr_val: Value for address comparator. + * @addr_acc: Address comparator access type. + * @addr_type: Current status of the comparator register. + * @ctxid_idx: Context ID index selector. + * @ctxid_size: Size of the context ID field to consider. + * @ctxid_val: Value of the context ID comparator. + * @ctxid_mask0:Context ID comparator mask for comparator 0-3. + * @ctxid_mask1:Context ID comparator mask for comparator 4-7. + * @vmid_idx: VM ID index selector. + * @vmid_size: Size of the VM ID comparator to consider. + * @vmid_val: Value of the VM ID comparator. + * @vmid_mask0: VM ID comparator mask for comparator 0-3. + * @vmid_mask1: VM ID comparator mask for comparator 4-7. + * @s_ex_level: In secure state, indicates whether instruction tracing is + * supported for the corresponding Exception level. + * @ns_ex_level:In non-secure state, indicates whether instruction tracing is + * supported for the corresponding Exception level. + * @ext_inp: External input selection. + */ +struct etmv4_drvdata { + void __iomem *base; + struct device *dev; + struct coresight_device *csdev; + spinlock_t spinlock; + int cpu; + u8 arch; + bool enable; + bool sticky_enable; + bool boot_enable; + bool os_unlock; + u8 nr_pe; + u8 nr_pe_cmp; + u8 nr_addr_cmp; + u8 nr_cntr; + u8 nr_ext_inp; + u8 numcidc; + u8 numvmidc; + u8 nrseqstate; + u8 nr_event; + u8 nr_resource; + u8 nr_ss_cmp; + u32 mode; + u8 trcid; + u8 trcid_size; + bool instrp0; + bool trccond; + bool retstack; + bool trc_error; + bool atbtrig; + bool lpoverride; + u32 pe_sel; + u32 cfg; + u32 eventctrl0; + u32 eventctrl1; + bool stallctl; + bool sysstall; + bool nooverflow; + u32 stall_ctrl; + u8 ts_size; + u32 ts_ctrl; + bool syncpr; + u32 syncfreq; + bool trccci; + u8 ccsize; + u8 ccitmin; + u32 ccctlr; + bool trcbb; + u32 bb_ctrl; + bool q_support; + u32 vinst_ctrl; + u32 viiectlr; + u32 vissctlr; + u32 vipcssctlr; + u8 seq_idx; + u32 seq_ctrl[ETM_MAX_SEQ_STATES]; + u32 seq_rst; + u32 seq_state; + u8 cntr_idx; + u32 cntrldvr[ETMv4_MAX_CNTR]; + u32 cntr_ctrl[ETMv4_MAX_CNTR]; + u32 cntr_val[ETMv4_MAX_CNTR]; + u8 res_idx; + u32 res_ctrl[ETM_MAX_RES_SEL]; + u32 ss_ctrl[ETM_MAX_SS_CMP]; + u32 ss_status[ETM_MAX_SS_CMP]; + u32 ss_pe_cmp[ETM_MAX_SS_CMP]; + u8 addr_idx; + u64 addr_val[ETM_MAX_SINGLE_ADDR_CMP]; + u64 addr_acc[ETM_MAX_SINGLE_ADDR_CMP]; + u8 addr_type[ETM_MAX_SINGLE_ADDR_CMP]; + u8 ctxid_idx; + u8 ctxid_size; + u64 ctxid_val[ETMv4_MAX_CTXID_CMP]; + u32 ctxid_mask0; + u32 ctxid_mask1; + u8 vmid_idx; + u8 vmid_size; + u64 vmid_val[ETM_MAX_VMID_CMP]; + u32 vmid_mask0; + u32 vmid_mask1; + u8 s_ex_level; + u8 ns_ex_level; + u32 ext_inp; +}; + +/* Address comparator access types */ +enum etm_addr_acctype { + ETM_INSTR_ADDR, + ETM_DATA_LOAD_ADDR, + ETM_DATA_STORE_ADDR, + ETM_DATA_LOAD_STORE_ADDR, +}; + +/* Address comparator context types */ +enum etm_addr_ctxtype { + ETM_CTX_NONE, + ETM_CTX_CTXID, + ETM_CTX_VMID, + ETM_CTX_CTXID_VMID, +}; + +enum etm_addr_type { + ETM_ADDR_TYPE_NONE, + ETM_ADDR_TYPE_SINGLE, + ETM_ADDR_TYPE_RANGE, + ETM_ADDR_TYPE_START, + ETM_ADDR_TYPE_STOP, +}; +#endif -- 2.7.4