1075 lines
28 KiB
C
1075 lines
28 KiB
C
/* Copyright (c) 2014, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/kernel.h>
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#include <linux/moduleparam.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/device.h>
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#include <linux/io.h>
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#include <linux/err.h>
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#include <linux/fs.h>
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#include <linux/slab.h>
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#include <linux/delay.h>
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#include <linux/smp.h>
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#include <linux/sysfs.h>
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#include <linux/stat.h>
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#include <linux/clk.h>
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#include <linux/cpu.h>
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#include <linux/coresight.h>
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#include <linux/coresight-pmu.h>
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#include <linux/pm_wakeup.h>
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#include <linux/amba/bus.h>
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#include <linux/seq_file.h>
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#include <linux/uaccess.h>
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#include <linux/perf_event.h>
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#include <linux/pm_runtime.h>
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#include <asm/sections.h>
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#include <asm/local.h>
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#include "coresight-etm4x.h"
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#include "coresight-etm-perf.h"
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static int boot_enable;
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module_param_named(boot_enable, boot_enable, int, S_IRUGO);
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/* The number of ETMv4 currently registered */
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static int etm4_count;
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static struct etmv4_drvdata *etmdrvdata[NR_CPUS];
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static void etm4_set_default_config(struct etmv4_config *config);
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static int etm4_set_event_filters(struct etmv4_drvdata *drvdata,
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struct perf_event *event);
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static enum cpuhp_state hp_online;
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static void etm4_os_unlock(struct etmv4_drvdata *drvdata)
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{
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/* Writing any value to ETMOSLAR unlocks the trace registers */
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writel_relaxed(0x0, drvdata->base + TRCOSLAR);
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drvdata->os_unlock = true;
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isb();
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}
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static bool etm4_arch_supported(u8 arch)
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{
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switch (arch) {
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case ETM_ARCH_V4:
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break;
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default:
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return false;
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}
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return true;
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}
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static int etm4_cpu_id(struct coresight_device *csdev)
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{
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struct etmv4_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
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return drvdata->cpu;
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}
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static int etm4_trace_id(struct coresight_device *csdev)
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{
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struct etmv4_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
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return drvdata->trcid;
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}
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static void etm4_enable_hw(void *info)
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{
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int i;
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struct etmv4_drvdata *drvdata = info;
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struct etmv4_config *config = &drvdata->config;
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CS_UNLOCK(drvdata->base);
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etm4_os_unlock(drvdata);
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/* Disable the trace unit before programming trace registers */
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writel_relaxed(0, drvdata->base + TRCPRGCTLR);
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/* wait for TRCSTATR.IDLE to go up */
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if (coresight_timeout(drvdata->base, TRCSTATR, TRCSTATR_IDLE_BIT, 1))
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dev_err(drvdata->dev,
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"timeout while waiting for Idle Trace Status\n");
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writel_relaxed(config->pe_sel, drvdata->base + TRCPROCSELR);
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writel_relaxed(config->cfg, drvdata->base + TRCCONFIGR);
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/* nothing specific implemented */
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writel_relaxed(0x0, drvdata->base + TRCAUXCTLR);
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writel_relaxed(config->eventctrl0, drvdata->base + TRCEVENTCTL0R);
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writel_relaxed(config->eventctrl1, drvdata->base + TRCEVENTCTL1R);
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writel_relaxed(config->stall_ctrl, drvdata->base + TRCSTALLCTLR);
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writel_relaxed(config->ts_ctrl, drvdata->base + TRCTSCTLR);
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writel_relaxed(config->syncfreq, drvdata->base + TRCSYNCPR);
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writel_relaxed(config->ccctlr, drvdata->base + TRCCCCTLR);
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writel_relaxed(config->bb_ctrl, drvdata->base + TRCBBCTLR);
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writel_relaxed(drvdata->trcid, drvdata->base + TRCTRACEIDR);
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writel_relaxed(config->vinst_ctrl, drvdata->base + TRCVICTLR);
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writel_relaxed(config->viiectlr, drvdata->base + TRCVIIECTLR);
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writel_relaxed(config->vissctlr,
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drvdata->base + TRCVISSCTLR);
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writel_relaxed(config->vipcssctlr,
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drvdata->base + TRCVIPCSSCTLR);
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for (i = 0; i < drvdata->nrseqstate - 1; i++)
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writel_relaxed(config->seq_ctrl[i],
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drvdata->base + TRCSEQEVRn(i));
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writel_relaxed(config->seq_rst, drvdata->base + TRCSEQRSTEVR);
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writel_relaxed(config->seq_state, drvdata->base + TRCSEQSTR);
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writel_relaxed(config->ext_inp, drvdata->base + TRCEXTINSELR);
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for (i = 0; i < drvdata->nr_cntr; i++) {
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writel_relaxed(config->cntrldvr[i],
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drvdata->base + TRCCNTRLDVRn(i));
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writel_relaxed(config->cntr_ctrl[i],
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drvdata->base + TRCCNTCTLRn(i));
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writel_relaxed(config->cntr_val[i],
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drvdata->base + TRCCNTVRn(i));
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}
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/* Resource selector pair 0 is always implemented and reserved */
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for (i = 0; i < drvdata->nr_resource * 2; i++)
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writel_relaxed(config->res_ctrl[i],
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drvdata->base + TRCRSCTLRn(i));
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for (i = 0; i < drvdata->nr_ss_cmp; i++) {
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writel_relaxed(config->ss_ctrl[i],
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drvdata->base + TRCSSCCRn(i));
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writel_relaxed(config->ss_status[i],
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drvdata->base + TRCSSCSRn(i));
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writel_relaxed(config->ss_pe_cmp[i],
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drvdata->base + TRCSSPCICRn(i));
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}
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for (i = 0; i < drvdata->nr_addr_cmp; i++) {
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writeq_relaxed(config->addr_val[i],
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drvdata->base + TRCACVRn(i));
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writeq_relaxed(config->addr_acc[i],
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drvdata->base + TRCACATRn(i));
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}
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for (i = 0; i < drvdata->numcidc; i++)
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writeq_relaxed(config->ctxid_pid[i],
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drvdata->base + TRCCIDCVRn(i));
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writel_relaxed(config->ctxid_mask0, drvdata->base + TRCCIDCCTLR0);
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writel_relaxed(config->ctxid_mask1, drvdata->base + TRCCIDCCTLR1);
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for (i = 0; i < drvdata->numvmidc; i++)
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writeq_relaxed(config->vmid_val[i],
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drvdata->base + TRCVMIDCVRn(i));
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writel_relaxed(config->vmid_mask0, drvdata->base + TRCVMIDCCTLR0);
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writel_relaxed(config->vmid_mask1, drvdata->base + TRCVMIDCCTLR1);
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/*
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* Request to keep the trace unit powered and also
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* emulation of powerdown
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*/
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writel_relaxed(readl_relaxed(drvdata->base + TRCPDCR) | TRCPDCR_PU,
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drvdata->base + TRCPDCR);
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/* Enable the trace unit */
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writel_relaxed(1, drvdata->base + TRCPRGCTLR);
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/* wait for TRCSTATR.IDLE to go back down to '0' */
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if (coresight_timeout(drvdata->base, TRCSTATR, TRCSTATR_IDLE_BIT, 0))
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dev_err(drvdata->dev,
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"timeout while waiting for Idle Trace Status\n");
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CS_LOCK(drvdata->base);
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dev_dbg(drvdata->dev, "cpu: %d enable smp call done\n", drvdata->cpu);
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}
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static int etm4_parse_event_config(struct etmv4_drvdata *drvdata,
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struct perf_event *event)
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{
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int ret = 0;
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struct etmv4_config *config = &drvdata->config;
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struct perf_event_attr *attr = &event->attr;
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if (!attr) {
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ret = -EINVAL;
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goto out;
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}
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/* Clear configuration from previous run */
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memset(config, 0, sizeof(struct etmv4_config));
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if (attr->exclude_kernel)
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config->mode = ETM_MODE_EXCL_KERN;
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if (attr->exclude_user)
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config->mode = ETM_MODE_EXCL_USER;
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/* Always start from the default config */
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etm4_set_default_config(config);
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/* Configure filters specified on the perf cmd line, if any. */
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ret = etm4_set_event_filters(drvdata, event);
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if (ret)
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goto out;
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/* Go from generic option to ETMv4 specifics */
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if (attr->config & BIT(ETM_OPT_CYCACC))
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config->cfg |= ETMv4_MODE_CYCACC;
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if (attr->config & BIT(ETM_OPT_TS))
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config->cfg |= ETMv4_MODE_TIMESTAMP;
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out:
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return ret;
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}
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static int etm4_enable_perf(struct coresight_device *csdev,
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struct perf_event *event)
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{
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int ret = 0;
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struct etmv4_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
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if (WARN_ON_ONCE(drvdata->cpu != smp_processor_id())) {
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ret = -EINVAL;
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goto out;
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}
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/* Configure the tracer based on the session's specifics */
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ret = etm4_parse_event_config(drvdata, event);
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if (ret)
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goto out;
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/* And enable it */
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etm4_enable_hw(drvdata);
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out:
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return ret;
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}
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static int etm4_enable_sysfs(struct coresight_device *csdev)
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{
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struct etmv4_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
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int ret;
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spin_lock(&drvdata->spinlock);
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/*
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* Executing etm4_enable_hw on the cpu whose ETM is being enabled
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* ensures that register writes occur when cpu is powered.
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*/
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ret = smp_call_function_single(drvdata->cpu,
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etm4_enable_hw, drvdata, 1);
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if (ret)
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goto err;
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drvdata->sticky_enable = true;
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spin_unlock(&drvdata->spinlock);
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dev_info(drvdata->dev, "ETM tracing enabled\n");
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return 0;
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err:
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spin_unlock(&drvdata->spinlock);
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return ret;
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}
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static int etm4_enable(struct coresight_device *csdev,
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struct perf_event *event, u32 mode)
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{
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int ret;
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u32 val;
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struct etmv4_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
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val = local_cmpxchg(&drvdata->mode, CS_MODE_DISABLED, mode);
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/* Someone is already using the tracer */
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if (val)
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return -EBUSY;
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switch (mode) {
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case CS_MODE_SYSFS:
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ret = etm4_enable_sysfs(csdev);
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break;
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case CS_MODE_PERF:
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ret = etm4_enable_perf(csdev, event);
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break;
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default:
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ret = -EINVAL;
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}
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/* The tracer didn't start */
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if (ret)
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local_set(&drvdata->mode, CS_MODE_DISABLED);
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return ret;
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}
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static void etm4_disable_hw(void *info)
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{
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u32 control;
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struct etmv4_drvdata *drvdata = info;
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CS_UNLOCK(drvdata->base);
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/* power can be removed from the trace unit now */
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control = readl_relaxed(drvdata->base + TRCPDCR);
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control &= ~TRCPDCR_PU;
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writel_relaxed(control, drvdata->base + TRCPDCR);
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control = readl_relaxed(drvdata->base + TRCPRGCTLR);
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/* EN, bit[0] Trace unit enable bit */
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control &= ~0x1;
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/* make sure everything completes before disabling */
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mb();
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isb();
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writel_relaxed(control, drvdata->base + TRCPRGCTLR);
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CS_LOCK(drvdata->base);
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dev_dbg(drvdata->dev, "cpu: %d disable smp call done\n", drvdata->cpu);
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}
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static int etm4_disable_perf(struct coresight_device *csdev,
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struct perf_event *event)
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{
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u32 control;
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struct etm_filters *filters = event->hw.addr_filters;
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struct etmv4_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
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if (WARN_ON_ONCE(drvdata->cpu != smp_processor_id()))
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return -EINVAL;
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etm4_disable_hw(drvdata);
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/*
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* Check if the start/stop logic was active when the unit was stopped.
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* That way we can re-enable the start/stop logic when the process is
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* scheduled again. Configuration of the start/stop logic happens in
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* function etm4_set_event_filters().
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*/
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control = readl_relaxed(drvdata->base + TRCVICTLR);
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/* TRCVICTLR::SSSTATUS, bit[9] */
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filters->ssstatus = (control & BIT(9));
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return 0;
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}
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static void etm4_disable_sysfs(struct coresight_device *csdev)
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{
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struct etmv4_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
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/*
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* Taking hotplug lock here protects from clocks getting disabled
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* with tracing being left on (crash scenario) if user disable occurs
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* after cpu online mask indicates the cpu is offline but before the
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* DYING hotplug callback is serviced by the ETM driver.
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*/
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get_online_cpus();
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spin_lock(&drvdata->spinlock);
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/*
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* Executing etm4_disable_hw on the cpu whose ETM is being disabled
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* ensures that register writes occur when cpu is powered.
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*/
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smp_call_function_single(drvdata->cpu, etm4_disable_hw, drvdata, 1);
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spin_unlock(&drvdata->spinlock);
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put_online_cpus();
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dev_info(drvdata->dev, "ETM tracing disabled\n");
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}
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static void etm4_disable(struct coresight_device *csdev,
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struct perf_event *event)
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{
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u32 mode;
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struct etmv4_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
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/*
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* For as long as the tracer isn't disabled another entity can't
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* change its status. As such we can read the status here without
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* fearing it will change under us.
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*/
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mode = local_read(&drvdata->mode);
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switch (mode) {
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case CS_MODE_DISABLED:
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break;
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case CS_MODE_SYSFS:
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etm4_disable_sysfs(csdev);
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break;
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case CS_MODE_PERF:
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etm4_disable_perf(csdev, event);
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break;
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}
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if (mode)
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local_set(&drvdata->mode, CS_MODE_DISABLED);
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}
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static const struct coresight_ops_source etm4_source_ops = {
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.cpu_id = etm4_cpu_id,
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.trace_id = etm4_trace_id,
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.enable = etm4_enable,
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.disable = etm4_disable,
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};
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static const struct coresight_ops etm4_cs_ops = {
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.source_ops = &etm4_source_ops,
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};
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static void etm4_init_arch_data(void *info)
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{
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u32 etmidr0;
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u32 etmidr1;
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u32 etmidr2;
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u32 etmidr3;
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u32 etmidr4;
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u32 etmidr5;
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struct etmv4_drvdata *drvdata = info;
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/* Make sure all registers are accessible */
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etm4_os_unlock(drvdata);
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CS_UNLOCK(drvdata->base);
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/* find all capabilities of the tracing unit */
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etmidr0 = readl_relaxed(drvdata->base + TRCIDR0);
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/* INSTP0, bits[2:1] P0 tracing support field */
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if (BMVAL(etmidr0, 1, 1) && BMVAL(etmidr0, 2, 2))
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drvdata->instrp0 = true;
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else
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drvdata->instrp0 = false;
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/* TRCBB, bit[5] Branch broadcast tracing support bit */
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if (BMVAL(etmidr0, 5, 5))
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drvdata->trcbb = true;
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else
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drvdata->trcbb = false;
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/* TRCCOND, bit[6] Conditional instruction tracing support bit */
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if (BMVAL(etmidr0, 6, 6))
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drvdata->trccond = true;
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else
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drvdata->trccond = false;
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/* TRCCCI, bit[7] Cycle counting instruction bit */
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if (BMVAL(etmidr0, 7, 7))
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drvdata->trccci = true;
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else
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drvdata->trccci = false;
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/* RETSTACK, bit[9] Return stack bit */
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if (BMVAL(etmidr0, 9, 9))
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drvdata->retstack = true;
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else
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drvdata->retstack = false;
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/* NUMEVENT, bits[11:10] Number of events field */
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drvdata->nr_event = BMVAL(etmidr0, 10, 11);
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/* QSUPP, bits[16:15] Q element support field */
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drvdata->q_support = BMVAL(etmidr0, 15, 16);
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/* TSSIZE, bits[28:24] Global timestamp size field */
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drvdata->ts_size = BMVAL(etmidr0, 24, 28);
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/* base architecture of trace unit */
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etmidr1 = readl_relaxed(drvdata->base + TRCIDR1);
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/*
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* TRCARCHMIN, bits[7:4] architecture the minor version number
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* TRCARCHMAJ, bits[11:8] architecture major versin number
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*/
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drvdata->arch = BMVAL(etmidr1, 4, 11);
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/* 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.
|
|
*/
|
|
drvdata->nr_resource = BMVAL(etmidr4, 16, 19) + 1;
|
|
/*
|
|
* 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_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);
|
|
}
|
|
|
|
static u64 etm4_get_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
|
|
*
|
|
* Always stay away from hypervisor mode.
|
|
*/
|
|
access_type = ETM_EXLEVEL_NS_HYP;
|
|
|
|
if (config->mode & ETM_MODE_EXCL_KERN)
|
|
access_type |= ETM_EXLEVEL_NS_OS;
|
|
|
|
if (config->mode & ETM_MODE_EXCL_USER)
|
|
access_type |= ETM_EXLEVEL_NS_APP;
|
|
|
|
/*
|
|
* EXLEVEL_S, bits[11:8], don't trace anything happening
|
|
* in secure state.
|
|
*/
|
|
access_type |= (ETM_EXLEVEL_S_APP |
|
|
ETM_EXLEVEL_S_OS |
|
|
ETM_EXLEVEL_S_HYP);
|
|
|
|
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)
|
|
{
|
|
u64 start, stop;
|
|
|
|
/*
|
|
* Configure address range comparator '0' to encompass all
|
|
* possible addresses.
|
|
*/
|
|
start = 0x0;
|
|
stop = ~0x0;
|
|
|
|
etm4_set_comparator_filter(config, start, stop,
|
|
ETM_DEFAULT_ADDR_COMP);
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
static void etm4_set_default(struct etmv4_config *config)
|
|
{
|
|
if (WARN_ON_ONCE(!config))
|
|
return;
|
|
|
|
/*
|
|
* Make default initialisation trace everything
|
|
*
|
|
* Select the "always true" resource selector on the
|
|
* "Enablign Event" line and configure address range comparator
|
|
* '0' to trace all the possible address range. From there
|
|
* configure the "include/exclude" engine to include address
|
|
* range comparator '0'.
|
|
*/
|
|
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 addr_acc, 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;
|
|
|
|
addr_acc = config->addr_acc[ETM_DEFAULT_ADDR_COMP];
|
|
/* clear default config */
|
|
addr_acc &= ~(ETM_EXLEVEL_NS_APP | ETM_EXLEVEL_NS_OS);
|
|
|
|
/*
|
|
* 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 (mode & ETM_MODE_EXCL_KERN)
|
|
addr_acc |= ETM_EXLEVEL_NS_OS;
|
|
else
|
|
addr_acc |= ETM_EXLEVEL_NS_APP;
|
|
|
|
config->addr_acc[ETM_DEFAULT_ADDR_COMP] = addr_acc;
|
|
config->addr_acc[ETM_DEFAULT_ADDR_COMP + 1] = addr_acc;
|
|
}
|
|
|
|
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]);
|
|
etmdrvdata[cpu]->os_unlock = true;
|
|
}
|
|
|
|
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 void etm4_init_trace_id(struct etmv4_drvdata *drvdata)
|
|
{
|
|
drvdata->trcid = coresight_get_trace_id(drvdata->cpu);
|
|
}
|
|
|
|
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 = { 0 };
|
|
struct device_node *np = adev->dev.of_node;
|
|
|
|
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_init_arch_data, drvdata, 1))
|
|
dev_err(dev, "ETM arch init failed\n");
|
|
|
|
if (!etm4_count++) {
|
|
cpuhp_setup_state_nocalls(CPUHP_AP_ARM_CORESIGHT_STARTING,
|
|
"arm/coresight4:starting",
|
|
etm4_starting_cpu, etm4_dying_cpu);
|
|
ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
|
|
"arm/coresight4:online",
|
|
etm4_online_cpu, NULL);
|
|
if (ret < 0)
|
|
goto err_arch_supported;
|
|
hp_online = ret;
|
|
}
|
|
|
|
put_online_cpus();
|
|
|
|
if (etm4_arch_supported(drvdata->arch) == false) {
|
|
ret = -EINVAL;
|
|
goto err_arch_supported;
|
|
}
|
|
|
|
etm4_init_trace_id(drvdata);
|
|
etm4_set_default(&drvdata->config);
|
|
|
|
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_arch_supported;
|
|
}
|
|
|
|
ret = etm_perf_symlink(drvdata->csdev, true);
|
|
if (ret) {
|
|
coresight_unregister(drvdata->csdev);
|
|
goto err_arch_supported;
|
|
}
|
|
|
|
pm_runtime_put(&adev->dev);
|
|
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:
|
|
if (--etm4_count == 0) {
|
|
cpuhp_remove_state_nocalls(CPUHP_AP_ARM_CORESIGHT_STARTING);
|
|
if (hp_online)
|
|
cpuhp_remove_state_nocalls(hp_online);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static struct amba_id etm4_ids[] = {
|
|
{ /* ETM 4.0 - Cortex-A53 */
|
|
.id = 0x000bb95d,
|
|
.mask = 0x000fffff,
|
|
.data = "ETM 4.0",
|
|
},
|
|
{ /* ETM 4.0 - Cortex-A57 */
|
|
.id = 0x000bb95e,
|
|
.mask = 0x000fffff,
|
|
.data = "ETM 4.0",
|
|
},
|
|
{ /* ETM 4.0 - A72, Maia, HiSilicon */
|
|
.id = 0x000bb95a,
|
|
.mask = 0x000fffff,
|
|
.data = "ETM 4.0",
|
|
},
|
|
{ 0, 0},
|
|
};
|
|
|
|
static struct amba_driver etm4x_driver = {
|
|
.drv = {
|
|
.name = "coresight-etm4x",
|
|
.suppress_bind_attrs = true,
|
|
},
|
|
.probe = etm4_probe,
|
|
.id_table = etm4_ids,
|
|
};
|
|
builtin_amba_driver(etm4x_driver);
|