Re: [PATCH v6 07/10] coresight: etm4x: Add complex configuration handlers to etmv4

From: Suzuki K Poulose
Date: Mon Apr 12 2021 - 06:28:28 EST

On 09/04/2021 11:37, 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@xxxxxxxxxx>
Reviewed-by: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
---
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

diff --git a/drivers/hwtracing/coresight/Makefile b/drivers/hwtracing/coresight/Makefile
index 63ecfc3cf66d..9420d33b23ac 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..d2ea903231b2
--- /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@xxxxxxxxxx>
+ */
+

+#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)
+{
+ 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..a204ad9a4792
--- /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


Looks like this must be guarded by the CONFIG_CORESIGHT_SOURCE_ETM4X to prevent the build failures on arm, as reported by the test robot.

#ifdef CONFIG_CORESIGHT_SOURCE_ETM4X

+
+#include "coresight-config.h"
+#include "coresight-etm4x.h"
+
+/* ETMv4 specific config functions */
+int etm4_cscfg_register(struct coresight_device *csdev);
+

endif /* ETM4X */

Cheers
Suzuki