Two nodes for configure flush are added here: 1. flush_req: write 1 to initiates a flush sequence.
2. flush_state: read this node to get flush status. 0: sequence in progress; 1: sequence has been completed.
Signed-off-by: Yuanfang Zhang quic_yuanfang@quicinc.com --- drivers/hwtracing/coresight/coresight-tnoc.c | 73 ++++++++++++++++++++++++++++ drivers/hwtracing/coresight/coresight-tnoc.h | 4 ++ 2 files changed, 77 insertions(+)
diff --git a/drivers/hwtracing/coresight/coresight-tnoc.c b/drivers/hwtracing/coresight/coresight-tnoc.c index 11b9a7fd1efdc9fff7c1e9666bda14acb41786cb..25962af3850af106f7a8b7e1738ad93d44b81ee7 100644 --- a/drivers/hwtracing/coresight/coresight-tnoc.c +++ b/drivers/hwtracing/coresight/coresight-tnoc.c @@ -16,6 +16,78 @@ #include "coresight-tnoc.h" #include "coresight-trace-id.h"
+static ssize_t flush_req_store(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t size) +{ + struct trace_noc_drvdata *drvdata = dev_get_drvdata(dev->parent); + struct coresight_device *csdev = drvdata->csdev; + unsigned long val; + u32 reg; + + if (kstrtoul(buf, 10, &val)) + return -EINVAL; + + if (val != 1) + return -EINVAL; + + spin_lock(&drvdata->spinlock); + if (csdev->refcnt == 0) { + spin_unlock(&drvdata->spinlock); + return -EPERM; + } + + reg = readl_relaxed(drvdata->base + TRACE_NOC_CTRL); + reg = reg | TRACE_NOC_CTRL_FLUSHREQ; + writel_relaxed(reg, drvdata->base + TRACE_NOC_CTRL); + + spin_unlock(&drvdata->spinlock); + + return size; +} +static DEVICE_ATTR_WO(flush_req); + +/* + * flush-sequence status: + * value 0: sequence in progress; + * value 1: sequence has been completed. + */ +static ssize_t flush_status_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct trace_noc_drvdata *drvdata = dev_get_drvdata(dev->parent); + struct coresight_device *csdev = drvdata->csdev; + u32 val; + + spin_lock(&drvdata->spinlock); + if (csdev->refcnt == 0) { + spin_unlock(&drvdata->spinlock); + return -EPERM; + } + + val = readl_relaxed(drvdata->base + TRACE_NOC_CTRL); + spin_unlock(&drvdata->spinlock); + return sysfs_emit(buf, "%u\n", BMVAL(val, 2, 2)); +} +static DEVICE_ATTR_RO(flush_status); + +static struct attribute *trace_noc_attrs[] = { + &dev_attr_flush_req.attr, + &dev_attr_flush_status.attr, + NULL, +}; + +static struct attribute_group trace_noc_attr_grp = { + .attrs = trace_noc_attrs, +}; + +static const struct attribute_group *trace_noc_attr_grps[] = { + &trace_noc_attr_grp, + NULL, +}; + static void trace_noc_enable_hw(struct trace_noc_drvdata *drvdata) { u32 val; @@ -142,6 +214,7 @@ static int trace_noc_probe(struct amba_device *adev, const struct amba_id *id) return ret;
desc.ops = &trace_noc_cs_ops; + desc.groups = trace_noc_attr_grps; desc.type = CORESIGHT_DEV_TYPE_LINK; desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_MERG; desc.pdata = adev->dev.platform_data; diff --git a/drivers/hwtracing/coresight/coresight-tnoc.h b/drivers/hwtracing/coresight/coresight-tnoc.h index b6bd1ef659897d8e0994c5e8514e8cbdd16eebd8..d0fe8f52709ff4147d66dbf90987595012cfaa4e 100644 --- a/drivers/hwtracing/coresight/coresight-tnoc.h +++ b/drivers/hwtracing/coresight/coresight-tnoc.h @@ -10,6 +10,10 @@
/* Enable generation of output ATB traffic.*/ #define TRACE_NOC_CTRL_PORTEN BIT(0) +/* Writing 1 to initiate a flush sequence.*/ +#define TRACE_NOC_CTRL_FLUSHREQ BIT(1) +/* 0: sequence in progress; 1: sequence has been completed.*/ +#define TRACE_NOC_CTRL_FLUSHSTATUS BIT(2) /* Writing 1 to issue a FREQ or FREQ_TS packet*/ #define TRACE_NOC_CTRL_FREQTSREQ BIT(5) /* Sets the type of issued ATB FLAG packets. 0: 'FLAG' packets; 1: 'FLAG_TS' packets.*/