| Message ID | 20210316180400.7184-8-mike.leach@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | CoreSight configuration management; ETM strobing | expand |
On Tue, Mar 16, 2021 at 06:03:57PM +0000, Mike Leach wrote: > Adds in handlers to allow the ETMv4 to use the complex configuration > support. Features and configurations can be loaded and selected in the > device. > > Signed-off-by: Mike Leach <mike.leach@linaro.org> > --- > drivers/hwtracing/coresight/Makefile | 3 +- > .../hwtracing/coresight/coresight-etm4x-cfg.c | 182 ++++++++++++++++++ > .../hwtracing/coresight/coresight-etm4x-cfg.h | 15 ++ > .../coresight/coresight-etm4x-core.c | 38 +++- > .../coresight/coresight-etm4x-sysfs.c | 3 + > 5 files changed, 238 insertions(+), 3 deletions(-) > create mode 100644 drivers/hwtracing/coresight/coresight-etm4x-cfg.c > create mode 100644 drivers/hwtracing/coresight/coresight-etm4x-cfg.h > Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org> > diff --git a/drivers/hwtracing/coresight/Makefile b/drivers/hwtracing/coresight/Makefile > index daad9f103a78..ea544206204d 100644 > --- a/drivers/hwtracing/coresight/Makefile > +++ b/drivers/hwtracing/coresight/Makefile > @@ -16,7 +16,8 @@ obj-$(CONFIG_CORESIGHT_SOURCE_ETM3X) += coresight-etm3x.o > coresight-etm3x-y := coresight-etm3x-core.o coresight-etm-cp14.o \ > coresight-etm3x-sysfs.o > obj-$(CONFIG_CORESIGHT_SOURCE_ETM4X) += coresight-etm4x.o > -coresight-etm4x-y := coresight-etm4x-core.o coresight-etm4x-sysfs.o > +coresight-etm4x-y := coresight-etm4x-core.o coresight-etm4x-sysfs.o \ > + coresight-etm4x-cfg.o > obj-$(CONFIG_CORESIGHT_STM) += coresight-stm.o > obj-$(CONFIG_CORESIGHT_CPU_DEBUG) += coresight-cpu-debug.o > obj-$(CONFIG_CORESIGHT_CATU) += coresight-catu.o > diff --git a/drivers/hwtracing/coresight/coresight-etm4x-cfg.c b/drivers/hwtracing/coresight/coresight-etm4x-cfg.c > new file mode 100644 > index 000000000000..de612498b29d > --- /dev/null > +++ b/drivers/hwtracing/coresight/coresight-etm4x-cfg.c > @@ -0,0 +1,182 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Copyright(C) 2020 Linaro Limited. All rights reserved. > + * Author: Mike Leach <mike.leach@linaro.org> > + */ > + > +#include "coresight-etm4x.h" > +#include "coresight-etm4x-cfg.h" > +#include "coresight-priv.h" > +#include "coresight-syscfg.h" > + > +/* defines to associate register IDs with driver data locations */ > +#define CHECKREG(cval, elem) \ > + { \ > + if (offset == cval) { \ > + reg_csdev->driver_regval = &drvcfg->elem; \ > + err = 0; \ > + break; \ > + } \ > + } > + > +#define CHECKREGIDX(cval, elem, off_idx, mask) \ > + { \ > + if (mask == cval) { \ > + reg_csdev->driver_regval = &drvcfg->elem[off_idx]; \ > + err = 0; \ > + break; \ > + } \ > + } > + > +/** > + * etm4_cfg_map_reg_offset - validate and map the register offset into a > + * location in the driver config struct. > + * > + * Limits the number of registers that can be accessed and programmed in > + * features, to those which are used to control the trace capture parameters. > + * > + * Omits or limits access to those which the driver must use exclusively. > + * > + * Invalid offsets will result in fail code return and feature load failure. > + * > + * @drvdata: driver data to map into. > + * @reg: register to map. > + * @offset: device offset for the register > + */ > +static int etm4_cfg_map_reg_offset(struct etmv4_drvdata *drvdata, > + struct cscfg_regval_csdev *reg_csdev, u32 offset) > +{ > + int err = -EINVAL, idx; > + struct etmv4_config *drvcfg = &drvdata->config; > + u32 off_mask; > + > + if (((offset >= TRCEVENTCTL0R) && (offset <= TRCVIPCSSCTLR)) || > + ((offset >= TRCSEQRSTEVR) && (offset <= TRCEXTINSELR)) || > + ((offset >= TRCCIDCCTLR0) && (offset <= TRCVMIDCCTLR1))) { > + do { > + CHECKREG(TRCEVENTCTL0R, eventctrl0); > + CHECKREG(TRCEVENTCTL1R, eventctrl1); > + CHECKREG(TRCSTALLCTLR, stall_ctrl); > + CHECKREG(TRCTSCTLR, ts_ctrl); > + CHECKREG(TRCSYNCPR, syncfreq); > + CHECKREG(TRCCCCTLR, ccctlr); > + CHECKREG(TRCBBCTLR, bb_ctrl); > + CHECKREG(TRCVICTLR, vinst_ctrl); > + CHECKREG(TRCVIIECTLR, viiectlr); > + CHECKREG(TRCVISSCTLR, vissctlr); > + CHECKREG(TRCVIPCSSCTLR, vipcssctlr); > + CHECKREG(TRCSEQRSTEVR, seq_rst); > + CHECKREG(TRCSEQSTR, seq_state); > + CHECKREG(TRCEXTINSELR, ext_inp); > + CHECKREG(TRCCIDCCTLR0, ctxid_mask0); > + CHECKREG(TRCCIDCCTLR1, ctxid_mask1); > + CHECKREG(TRCVMIDCCTLR0, vmid_mask0); > + CHECKREG(TRCVMIDCCTLR1, vmid_mask1); > + } while (0); > + } else if ((offset & GENMASK(11, 4)) == TRCSEQEVRn(0)) { > + /* sequencer state control registers */ > + idx = (offset & GENMASK(3, 0)) / 4; > + if (idx < ETM_MAX_SEQ_STATES) { > + reg_csdev->driver_regval = &drvcfg->seq_ctrl[idx]; > + err = 0; > + } > + } else if ((offset >= TRCSSCCRn(0)) && (offset <= TRCSSPCICRn(7))) { > + /* 32 bit, 8 off indexed register sets */ > + idx = (offset & GENMASK(4, 0)) / 4; > + off_mask = (offset & GENMASK(11, 5)); > + do { > + CHECKREGIDX(TRCSSCCRn(0), ss_ctrl, idx, off_mask); > + CHECKREGIDX(TRCSSCSRn(0), ss_status, idx, off_mask); > + CHECKREGIDX(TRCSSPCICRn(0), ss_pe_cmp, idx, off_mask); > + } while (0); > + } else if ((offset >= TRCCIDCVRn(0)) && (offset <= TRCVMIDCVRn(7))) { > + /* 64 bit, 8 off indexed register sets */ > + idx = (offset & GENMASK(5, 0)) / 8; > + off_mask = (offset & GENMASK(11, 6)); > + do { > + CHECKREGIDX(TRCCIDCVRn(0), ctxid_pid, idx, off_mask); > + CHECKREGIDX(TRCVMIDCVRn(0), vmid_val, idx, off_mask); > + } while (0); > + } else if ((offset >= TRCRSCTLRn(2)) && > + (offset <= TRCRSCTLRn((ETM_MAX_RES_SEL - 1)))) { > + /* 32 bit resource selection regs, 32 off, skip fixed 0,1 */ > + idx = (offset & GENMASK(6, 0)) / 4; > + if (idx < ETM_MAX_RES_SEL) { > + reg_csdev->driver_regval = &drvcfg->res_ctrl[idx]; > + err = 0; > + } > + } else if ((offset >= TRCACVRn(0)) && > + (offset <= TRCACATRn((ETM_MAX_SINGLE_ADDR_CMP - 1)))) { > + /* 64 bit addr cmp regs, 16 off */ > + idx = (offset & GENMASK(6, 0)) / 8; > + off_mask = offset & GENMASK(11, 7); > + do { > + CHECKREGIDX(TRCACVRn(0), addr_val, idx, off_mask); > + CHECKREGIDX(TRCACATRn(0), addr_acc, idx, off_mask); > + } while (0); > + } else if ((offset >= TRCCNTRLDVRn(0)) && > + (offset <= TRCCNTVRn((ETMv4_MAX_CNTR - 1)))) { > + /* 32 bit counter regs, 4 off (ETMv4_MAX_CNTR - 1) */ > + idx = (offset & GENMASK(3, 0)) / 4; > + off_mask = offset & GENMASK(11, 4); > + do { > + CHECKREGIDX(TRCCNTRLDVRn(0), cntrldvr, idx, off_mask); > + CHECKREGIDX(TRCCNTCTLRn(0), cntr_ctrl, idx, off_mask); > + CHECKREGIDX(TRCCNTVRn(0), cntr_val, idx, off_mask); > + } while (0); > + } > + return err; > +} > + > +/** > + * etm4_cfg_load_feature - load a feature into a device instance. > + * > + * @csdev: An ETMv4 CoreSight device. > + * @feat: The feature to be loaded. > + * > + * The function will load a feature instance into the device, checking that > + * the register definitions are valid for the device. > + * > + * Parameter and register definitions will be converted into internal > + * structures that are used to set the values in the driver when the > + * feature is enabled for the device. > + * > + * The feature spinlock pointer is initialised to the same spinlock > + * that the driver uses to protect the internal register values. > + */ > +static int etm4_cfg_load_feature(struct coresight_device *csdev, > + struct cscfg_feature_csdev *feat_csdev) > +{ > + struct device *dev = csdev->dev.parent; > + struct etmv4_drvdata *drvdata = dev_get_drvdata(dev); > + const struct cscfg_feature_desc *feat_desc = feat_csdev->feat_desc; > + u32 offset; > + int i = 0, err = 0; > + > + /* > + * essential we set the device spinlock - this is used in the generic > + * programming routines when copying values into the drvdata structures > + * via the pointers setup in etm4_cfg_map_reg_offset(). > + */ > + feat_csdev->drv_spinlock = &drvdata->spinlock; > + > + /* process the register descriptions */ > + for (i = 0; i < feat_csdev->nr_regs && !err; i++) { > + offset = feat_desc->regs_desc[i].offset; > + err = etm4_cfg_map_reg_offset(drvdata, &feat_csdev->regs_csdev[i], offset); > + } > + return err; > +} > + > +/* match information when loading configurations */ > +#define CS_CFG_ETM4_MATCH_FLAGS (CS_CFG_MATCH_CLASS_SRC_ALL | \ > + CS_CFG_MATCH_CLASS_SRC_ETM4) > + > +int etm4_cscfg_register(struct coresight_device *csdev, const char *dev_name) > +{ > + struct cscfg_csdev_feat_ops ops; > + > + ops.load_feat = &etm4_cfg_load_feature; > + > + return cscfg_register_csdev(csdev, CS_CFG_ETM4_MATCH_FLAGS, &ops); > +} > diff --git a/drivers/hwtracing/coresight/coresight-etm4x-cfg.h b/drivers/hwtracing/coresight/coresight-etm4x-cfg.h > new file mode 100644 > index 000000000000..7ec65771ee58 > --- /dev/null > +++ b/drivers/hwtracing/coresight/coresight-etm4x-cfg.h > @@ -0,0 +1,15 @@ > +/* SPDX-License-Identifier: GPL-2.0 */ > +/* > + * Copyright (c) 2014-2020, The Linux Foundation. All rights reserved. > + */ > + > +#ifndef _CORESIGHT_ETM4X_CFG_H > +#define _CORESIGHT_ETM4X_CFG_H > + > +#include "coresight-config.h" > +#include "coresight-etm4x.h" > + > +/* ETMv4 specific config functions */ > +int etm4_cscfg_register(struct coresight_device *csdev, const char *dev_name); > + > +#endif /* CORESIGHT_ETM4X_CFG_H */ > diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/drivers/hwtracing/coresight/coresight-etm4x-core.c > index 15016f757828..fb82a33f2606 100644 > --- a/drivers/hwtracing/coresight/coresight-etm4x-core.c > +++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c > @@ -38,6 +38,8 @@ > > #include "coresight-etm4x.h" > #include "coresight-etm-perf.h" > +#include "coresight-etm4x-cfg.h" > +#include "coresight-syscfg.h" > > static int boot_enable; > module_param(boot_enable, int, 0444); > @@ -492,12 +494,15 @@ static int etm4_config_timestamp_event(struct etmv4_drvdata *drvdata) > return ret; > } > > -static int etm4_parse_event_config(struct etmv4_drvdata *drvdata, > +static int etm4_parse_event_config(struct coresight_device *csdev, > struct perf_event *event) > { > int ret = 0; > + struct etmv4_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); > struct etmv4_config *config = &drvdata->config; > struct perf_event_attr *attr = &event->attr; > + unsigned long cfg_hash; > + int preset; > > if (!attr) { > ret = -EINVAL; > @@ -568,6 +573,20 @@ static int etm4_parse_event_config(struct etmv4_drvdata *drvdata, > /* bit[12], Return stack enable bit */ > config->cfg |= BIT(12); > > + /* > + * Set any selected configuration and preset. > + * > + * This extracts the values of PMU_FORMAT_ATTR(configid) and PMU_FORMAT_ATTR(preset) > + * in the perf attributes defined in coresight-etm-perf.c. > + * configid uses bits 63:32 of attr->config2, preset uses bits 3:0 of attr->config. > + * A zero configid means no configuration active, preset = 0 means no preset selected. > + */ > + if (attr->config2 & GENMASK_ULL(63, 32)) { > + cfg_hash = (u32)(attr->config2 >> 32); > + preset = attr->config & 0xF; > + ret = cscfg_csdev_enable_active_config(csdev, cfg_hash, preset); > + } > + > out: > return ret; > } > @@ -584,7 +603,7 @@ static int etm4_enable_perf(struct coresight_device *csdev, > } > > /* Configure the tracer based on the session's specifics */ > - ret = etm4_parse_event_config(drvdata, event); > + ret = etm4_parse_event_config(csdev, event); > if (ret) > goto out; > /* And enable it */ > @@ -715,11 +734,18 @@ static int etm4_disable_perf(struct coresight_device *csdev, > u32 control; > struct etm_filters *filters = event->hw.addr_filters; > struct etmv4_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); > + struct perf_event_attr *attr = &event->attr; > > if (WARN_ON_ONCE(drvdata->cpu != smp_processor_id())) > return -EINVAL; > > etm4_disable_hw(drvdata); > + /* > + * The config_id occupies bits 63:32 of the config2 perf event attr > + * field. If this is non-zero then we will have enabled a config. > + */ > + if (attr->config2 & GENMASK_ULL(63, 32)) > + cscfg_csdev_disable_active_config(csdev); > > /* > * Check if the start/stop logic was active when the unit was stopped. > @@ -1831,6 +1857,13 @@ static int etm4_probe(struct device *dev, void __iomem *base, u32 etm_pid) > return ret; > } > > + /* register with config infrastructure & load any current features */ > + ret = etm4_cscfg_register(drvdata->csdev, dev_name(dev)); > + if (ret) { > + coresight_unregister(drvdata->csdev); > + return ret; > + } > + > etmdrvdata[drvdata->cpu] = drvdata; > > dev_info(&drvdata->csdev->dev, "CPU%d: ETM v%d.%d initialized\n", > @@ -1918,6 +1951,7 @@ static int __exit etm4_remove_dev(struct etmv4_drvdata *drvdata) > > cpus_read_unlock(); > > + cscfg_unregister_csdev(drvdata->csdev); > coresight_unregister(drvdata->csdev); > > return 0; > diff --git a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c > index 0995a10790f4..71593b605bd5 100644 > --- a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c > +++ b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c > @@ -9,6 +9,7 @@ > #include <linux/sysfs.h> > #include "coresight-etm4x.h" > #include "coresight-priv.h" > +#include "coresight-syscfg.h" > > static int etm4_set_mode_exclude(struct etmv4_drvdata *drvdata, bool exclude) > { > @@ -269,6 +270,8 @@ static ssize_t reset_store(struct device *dev, > > spin_unlock(&drvdata->spinlock); > > + cscfg_csdev_reset_feats(to_coresight_device(dev)); > + > return size; > } > static DEVICE_ATTR_WO(reset); > -- > 2.17.1 >
diff --git a/drivers/hwtracing/coresight/Makefile b/drivers/hwtracing/coresight/Makefile index daad9f103a78..ea544206204d 100644 --- a/drivers/hwtracing/coresight/Makefile +++ b/drivers/hwtracing/coresight/Makefile @@ -16,7 +16,8 @@ obj-$(CONFIG_CORESIGHT_SOURCE_ETM3X) += coresight-etm3x.o coresight-etm3x-y := coresight-etm3x-core.o coresight-etm-cp14.o \ coresight-etm3x-sysfs.o obj-$(CONFIG_CORESIGHT_SOURCE_ETM4X) += coresight-etm4x.o -coresight-etm4x-y := coresight-etm4x-core.o coresight-etm4x-sysfs.o +coresight-etm4x-y := coresight-etm4x-core.o coresight-etm4x-sysfs.o \ + coresight-etm4x-cfg.o obj-$(CONFIG_CORESIGHT_STM) += coresight-stm.o obj-$(CONFIG_CORESIGHT_CPU_DEBUG) += coresight-cpu-debug.o obj-$(CONFIG_CORESIGHT_CATU) += coresight-catu.o diff --git a/drivers/hwtracing/coresight/coresight-etm4x-cfg.c b/drivers/hwtracing/coresight/coresight-etm4x-cfg.c new file mode 100644 index 000000000000..de612498b29d --- /dev/null +++ b/drivers/hwtracing/coresight/coresight-etm4x-cfg.c @@ -0,0 +1,182 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright(C) 2020 Linaro Limited. All rights reserved. + * Author: Mike Leach <mike.leach@linaro.org> + */ + +#include "coresight-etm4x.h" +#include "coresight-etm4x-cfg.h" +#include "coresight-priv.h" +#include "coresight-syscfg.h" + +/* defines to associate register IDs with driver data locations */ +#define CHECKREG(cval, elem) \ + { \ + if (offset == cval) { \ + reg_csdev->driver_regval = &drvcfg->elem; \ + err = 0; \ + break; \ + } \ + } + +#define CHECKREGIDX(cval, elem, off_idx, mask) \ + { \ + if (mask == cval) { \ + reg_csdev->driver_regval = &drvcfg->elem[off_idx]; \ + err = 0; \ + break; \ + } \ + } + +/** + * etm4_cfg_map_reg_offset - validate and map the register offset into a + * location in the driver config struct. + * + * Limits the number of registers that can be accessed and programmed in + * features, to those which are used to control the trace capture parameters. + * + * Omits or limits access to those which the driver must use exclusively. + * + * Invalid offsets will result in fail code return and feature load failure. + * + * @drvdata: driver data to map into. + * @reg: register to map. + * @offset: device offset for the register + */ +static int etm4_cfg_map_reg_offset(struct etmv4_drvdata *drvdata, + struct cscfg_regval_csdev *reg_csdev, u32 offset) +{ + int err = -EINVAL, idx; + struct etmv4_config *drvcfg = &drvdata->config; + u32 off_mask; + + if (((offset >= TRCEVENTCTL0R) && (offset <= TRCVIPCSSCTLR)) || + ((offset >= TRCSEQRSTEVR) && (offset <= TRCEXTINSELR)) || + ((offset >= TRCCIDCCTLR0) && (offset <= TRCVMIDCCTLR1))) { + do { + CHECKREG(TRCEVENTCTL0R, eventctrl0); + CHECKREG(TRCEVENTCTL1R, eventctrl1); + CHECKREG(TRCSTALLCTLR, stall_ctrl); + CHECKREG(TRCTSCTLR, ts_ctrl); + CHECKREG(TRCSYNCPR, syncfreq); + CHECKREG(TRCCCCTLR, ccctlr); + CHECKREG(TRCBBCTLR, bb_ctrl); + CHECKREG(TRCVICTLR, vinst_ctrl); + CHECKREG(TRCVIIECTLR, viiectlr); + CHECKREG(TRCVISSCTLR, vissctlr); + CHECKREG(TRCVIPCSSCTLR, vipcssctlr); + CHECKREG(TRCSEQRSTEVR, seq_rst); + CHECKREG(TRCSEQSTR, seq_state); + CHECKREG(TRCEXTINSELR, ext_inp); + CHECKREG(TRCCIDCCTLR0, ctxid_mask0); + CHECKREG(TRCCIDCCTLR1, ctxid_mask1); + CHECKREG(TRCVMIDCCTLR0, vmid_mask0); + CHECKREG(TRCVMIDCCTLR1, vmid_mask1); + } while (0); + } else if ((offset & GENMASK(11, 4)) == TRCSEQEVRn(0)) { + /* sequencer state control registers */ + idx = (offset & GENMASK(3, 0)) / 4; + if (idx < ETM_MAX_SEQ_STATES) { + reg_csdev->driver_regval = &drvcfg->seq_ctrl[idx]; + err = 0; + } + } else if ((offset >= TRCSSCCRn(0)) && (offset <= TRCSSPCICRn(7))) { + /* 32 bit, 8 off indexed register sets */ + idx = (offset & GENMASK(4, 0)) / 4; + off_mask = (offset & GENMASK(11, 5)); + do { + CHECKREGIDX(TRCSSCCRn(0), ss_ctrl, idx, off_mask); + CHECKREGIDX(TRCSSCSRn(0), ss_status, idx, off_mask); + CHECKREGIDX(TRCSSPCICRn(0), ss_pe_cmp, idx, off_mask); + } while (0); + } else if ((offset >= TRCCIDCVRn(0)) && (offset <= TRCVMIDCVRn(7))) { + /* 64 bit, 8 off indexed register sets */ + idx = (offset & GENMASK(5, 0)) / 8; + off_mask = (offset & GENMASK(11, 6)); + do { + CHECKREGIDX(TRCCIDCVRn(0), ctxid_pid, idx, off_mask); + CHECKREGIDX(TRCVMIDCVRn(0), vmid_val, idx, off_mask); + } while (0); + } else if ((offset >= TRCRSCTLRn(2)) && + (offset <= TRCRSCTLRn((ETM_MAX_RES_SEL - 1)))) { + /* 32 bit resource selection regs, 32 off, skip fixed 0,1 */ + idx = (offset & GENMASK(6, 0)) / 4; + if (idx < ETM_MAX_RES_SEL) { + reg_csdev->driver_regval = &drvcfg->res_ctrl[idx]; + err = 0; + } + } else if ((offset >= TRCACVRn(0)) && + (offset <= TRCACATRn((ETM_MAX_SINGLE_ADDR_CMP - 1)))) { + /* 64 bit addr cmp regs, 16 off */ + idx = (offset & GENMASK(6, 0)) / 8; + off_mask = offset & GENMASK(11, 7); + do { + CHECKREGIDX(TRCACVRn(0), addr_val, idx, off_mask); + CHECKREGIDX(TRCACATRn(0), addr_acc, idx, off_mask); + } while (0); + } else if ((offset >= TRCCNTRLDVRn(0)) && + (offset <= TRCCNTVRn((ETMv4_MAX_CNTR - 1)))) { + /* 32 bit counter regs, 4 off (ETMv4_MAX_CNTR - 1) */ + idx = (offset & GENMASK(3, 0)) / 4; + off_mask = offset & GENMASK(11, 4); + do { + CHECKREGIDX(TRCCNTRLDVRn(0), cntrldvr, idx, off_mask); + CHECKREGIDX(TRCCNTCTLRn(0), cntr_ctrl, idx, off_mask); + CHECKREGIDX(TRCCNTVRn(0), cntr_val, idx, off_mask); + } while (0); + } + return err; +} + +/** + * etm4_cfg_load_feature - load a feature into a device instance. + * + * @csdev: An ETMv4 CoreSight device. + * @feat: The feature to be loaded. + * + * The function will load a feature instance into the device, checking that + * the register definitions are valid for the device. + * + * Parameter and register definitions will be converted into internal + * structures that are used to set the values in the driver when the + * feature is enabled for the device. + * + * The feature spinlock pointer is initialised to the same spinlock + * that the driver uses to protect the internal register values. + */ +static int etm4_cfg_load_feature(struct coresight_device *csdev, + struct cscfg_feature_csdev *feat_csdev) +{ + struct device *dev = csdev->dev.parent; + struct etmv4_drvdata *drvdata = dev_get_drvdata(dev); + const struct cscfg_feature_desc *feat_desc = feat_csdev->feat_desc; + u32 offset; + int i = 0, err = 0; + + /* + * essential we set the device spinlock - this is used in the generic + * programming routines when copying values into the drvdata structures + * via the pointers setup in etm4_cfg_map_reg_offset(). + */ + feat_csdev->drv_spinlock = &drvdata->spinlock; + + /* process the register descriptions */ + for (i = 0; i < feat_csdev->nr_regs && !err; i++) { + offset = feat_desc->regs_desc[i].offset; + err = etm4_cfg_map_reg_offset(drvdata, &feat_csdev->regs_csdev[i], offset); + } + return err; +} + +/* match information when loading configurations */ +#define CS_CFG_ETM4_MATCH_FLAGS (CS_CFG_MATCH_CLASS_SRC_ALL | \ + CS_CFG_MATCH_CLASS_SRC_ETM4) + +int etm4_cscfg_register(struct coresight_device *csdev, const char *dev_name) +{ + struct cscfg_csdev_feat_ops ops; + + ops.load_feat = &etm4_cfg_load_feature; + + return cscfg_register_csdev(csdev, CS_CFG_ETM4_MATCH_FLAGS, &ops); +} diff --git a/drivers/hwtracing/coresight/coresight-etm4x-cfg.h b/drivers/hwtracing/coresight/coresight-etm4x-cfg.h new file mode 100644 index 000000000000..7ec65771ee58 --- /dev/null +++ b/drivers/hwtracing/coresight/coresight-etm4x-cfg.h @@ -0,0 +1,15 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2014-2020, The Linux Foundation. All rights reserved. + */ + +#ifndef _CORESIGHT_ETM4X_CFG_H +#define _CORESIGHT_ETM4X_CFG_H + +#include "coresight-config.h" +#include "coresight-etm4x.h" + +/* ETMv4 specific config functions */ +int etm4_cscfg_register(struct coresight_device *csdev, const char *dev_name); + +#endif /* CORESIGHT_ETM4X_CFG_H */ diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/drivers/hwtracing/coresight/coresight-etm4x-core.c index 15016f757828..fb82a33f2606 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x-core.c +++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c @@ -38,6 +38,8 @@ #include "coresight-etm4x.h" #include "coresight-etm-perf.h" +#include "coresight-etm4x-cfg.h" +#include "coresight-syscfg.h" static int boot_enable; module_param(boot_enable, int, 0444); @@ -492,12 +494,15 @@ static int etm4_config_timestamp_event(struct etmv4_drvdata *drvdata) return ret; } -static int etm4_parse_event_config(struct etmv4_drvdata *drvdata, +static int etm4_parse_event_config(struct coresight_device *csdev, struct perf_event *event) { int ret = 0; + struct etmv4_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); struct etmv4_config *config = &drvdata->config; struct perf_event_attr *attr = &event->attr; + unsigned long cfg_hash; + int preset; if (!attr) { ret = -EINVAL; @@ -568,6 +573,20 @@ static int etm4_parse_event_config(struct etmv4_drvdata *drvdata, /* bit[12], Return stack enable bit */ config->cfg |= BIT(12); + /* + * Set any selected configuration and preset. + * + * This extracts the values of PMU_FORMAT_ATTR(configid) and PMU_FORMAT_ATTR(preset) + * in the perf attributes defined in coresight-etm-perf.c. + * configid uses bits 63:32 of attr->config2, preset uses bits 3:0 of attr->config. + * A zero configid means no configuration active, preset = 0 means no preset selected. + */ + if (attr->config2 & GENMASK_ULL(63, 32)) { + cfg_hash = (u32)(attr->config2 >> 32); + preset = attr->config & 0xF; + ret = cscfg_csdev_enable_active_config(csdev, cfg_hash, preset); + } + out: return ret; } @@ -584,7 +603,7 @@ static int etm4_enable_perf(struct coresight_device *csdev, } /* Configure the tracer based on the session's specifics */ - ret = etm4_parse_event_config(drvdata, event); + ret = etm4_parse_event_config(csdev, event); if (ret) goto out; /* And enable it */ @@ -715,11 +734,18 @@ static int etm4_disable_perf(struct coresight_device *csdev, u32 control; struct etm_filters *filters = event->hw.addr_filters; struct etmv4_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); + struct perf_event_attr *attr = &event->attr; if (WARN_ON_ONCE(drvdata->cpu != smp_processor_id())) return -EINVAL; etm4_disable_hw(drvdata); + /* + * The config_id occupies bits 63:32 of the config2 perf event attr + * field. If this is non-zero then we will have enabled a config. + */ + if (attr->config2 & GENMASK_ULL(63, 32)) + cscfg_csdev_disable_active_config(csdev); /* * Check if the start/stop logic was active when the unit was stopped. @@ -1831,6 +1857,13 @@ static int etm4_probe(struct device *dev, void __iomem *base, u32 etm_pid) return ret; } + /* register with config infrastructure & load any current features */ + ret = etm4_cscfg_register(drvdata->csdev, dev_name(dev)); + if (ret) { + coresight_unregister(drvdata->csdev); + return ret; + } + etmdrvdata[drvdata->cpu] = drvdata; dev_info(&drvdata->csdev->dev, "CPU%d: ETM v%d.%d initialized\n", @@ -1918,6 +1951,7 @@ static int __exit etm4_remove_dev(struct etmv4_drvdata *drvdata) cpus_read_unlock(); + cscfg_unregister_csdev(drvdata->csdev); coresight_unregister(drvdata->csdev); return 0; diff --git a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c index 0995a10790f4..71593b605bd5 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c +++ b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c @@ -9,6 +9,7 @@ #include <linux/sysfs.h> #include "coresight-etm4x.h" #include "coresight-priv.h" +#include "coresight-syscfg.h" static int etm4_set_mode_exclude(struct etmv4_drvdata *drvdata, bool exclude) { @@ -269,6 +270,8 @@ static ssize_t reset_store(struct device *dev, spin_unlock(&drvdata->spinlock); + cscfg_csdev_reset_feats(to_coresight_device(dev)); + return size; } static DEVICE_ATTR_WO(reset);
Adds in handlers to allow the ETMv4 to use the complex configuration support. Features and configurations can be loaded and selected in the device. Signed-off-by: Mike Leach <mike.leach@linaro.org> --- drivers/hwtracing/coresight/Makefile | 3 +- .../hwtracing/coresight/coresight-etm4x-cfg.c | 182 ++++++++++++++++++ .../hwtracing/coresight/coresight-etm4x-cfg.h | 15 ++ .../coresight/coresight-etm4x-core.c | 38 +++- .../coresight/coresight-etm4x-sysfs.c | 3 + 5 files changed, 238 insertions(+), 3 deletions(-) create mode 100644 drivers/hwtracing/coresight/coresight-etm4x-cfg.c create mode 100644 drivers/hwtracing/coresight/coresight-etm4x-cfg.h