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coresight: etb10: splitting sysFS "status" entry 

The sysFS "status" entry conveys a wealth of information about
the status of the HW but goes agains the sysFS rule of one topic
per file.

This patch rectify the situation by adding read-only entries for
each of the field formaly displayed by "status".  The ABI
documentation is kept up to date.

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mathieu Poirier 2016-04-05 11:53:51 -06:00 committed by Greg Kroah-Hartman
parent 154f3520fe
commit ad352acbb9
2 changed files with 98 additions and 48 deletions
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69
Documentation/ABI/testing/sysfs-bus-coresight-devices-etb10
View File

@ -6,13 +6,6 @@ Description: (RW) Add/remove a sink from a trace path. There can be multiple
source for a single sink.
ex: echo 1 > /sys/bus/coresight/devices/20010000.etb/enable_sink
What: /sys/bus/coresight/devices/<memory_map>.etb/status
Date: November 2014
KernelVersion: 3.19
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (R) List various control and status registers. The specific
layout and content is driver specific.
What: /sys/bus/coresight/devices/<memory_map>.etb/trigger_cntr
Date: November 2014
KernelVersion: 3.19
@ -22,3 +15,65 @@ Description: (RW) Disables write access to the Trace RAM by stopping the
following the trigger event. The number of 32-bit words written
into the Trace RAM following the trigger event is equal to the
value stored in this register+1 (from ARM ETB-TRM).
What: /sys/bus/coresight/devices/<memory_map>.etb/mgmt/rdp
Date: March 2016
KernelVersion: 4.7
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (R) Defines the depth, in words, of the trace RAM in powers of
2. The value is read directly from HW register RDP, 0x004.
What: /sys/bus/coresight/devices/<memory_map>.etb/mgmt/sts
Date: March 2016
KernelVersion: 4.7
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (R) Shows the value held by the ETB status register. The value
is read directly from HW register STS, 0x00C.
What: /sys/bus/coresight/devices/<memory_map>.etb/mgmt/rrp
Date: March 2016
KernelVersion: 4.7
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (R) Shows the value held by the ETB RAM Read Pointer register
that is used to read entries from the Trace RAM over the APB
interface. The value is read directly from HW register RRP,
0x014.
What: /sys/bus/coresight/devices/<memory_map>.etb/mgmt/rwp
Date: March 2016
KernelVersion: 4.7
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (R) Shows the value held by the ETB RAM Write Pointer register
that is used to sets the write pointer to write entries from
the CoreSight bus into the Trace RAM. The value is read directly
from HW register RWP, 0x018.
What: /sys/bus/coresight/devices/<memory_map>.etb/mgmt/trg
Date: March 2016
KernelVersion: 4.7
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (R) Similar to "trigger_cntr" above except that this value is
read directly from HW register TRG, 0x01C.
What: /sys/bus/coresight/devices/<memory_map>.etb/mgmt/ctl
Date: March 2016
KernelVersion: 4.7
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (R) Shows the value held by the ETB Control register. The value
is read directly from HW register CTL, 0x020.
What: /sys/bus/coresight/devices/<memory_map>.etb/mgmt/ffsr
Date: March 2016
KernelVersion: 4.7
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (R) Shows the value held by the ETB Formatter and Flush Status
register. The value is read directly from HW register FFSR,
0x300.
What: /sys/bus/coresight/devices/<memory_map>.etb/mgmt/ffcr
Date: March 2016
KernelVersion: 4.7
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (R) Shows the value held by the ETB Formatter and Flush Control
register. The value is read directly from HW register FFCR,
0x304.

77
drivers/hwtracing/coresight/coresight-etb10.c
View File

@ -579,47 +579,29 @@ static const struct file_operations etb_fops = {
.llseek = no_llseek,
};
static ssize_t status_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
unsigned long flags;
u32 etb_rdr, etb_sr, etb_rrp, etb_rwp;
u32 etb_trg, etb_cr, etb_ffsr, etb_ffcr;
struct etb_drvdata *drvdata = dev_get_drvdata(dev->parent);
#define coresight_etb10_simple_func(name, offset) \
coresight_simple_func(struct etb_drvdata, name, offset)
pm_runtime_get_sync(drvdata->dev);
spin_lock_irqsave(&drvdata->spinlock, flags);
CS_UNLOCK(drvdata->base);
coresight_etb10_simple_func(rdp, ETB_RAM_DEPTH_REG);
coresight_etb10_simple_func(sts, ETB_STATUS_REG);
coresight_etb10_simple_func(rrp, ETB_RAM_READ_POINTER);
coresight_etb10_simple_func(rwp, ETB_RAM_WRITE_POINTER);
coresight_etb10_simple_func(trg, ETB_TRG);
coresight_etb10_simple_func(ctl, ETB_CTL_REG);
coresight_etb10_simple_func(ffsr, ETB_FFSR);
coresight_etb10_simple_func(ffcr, ETB_FFCR);
etb_rdr = readl_relaxed(drvdata->base + ETB_RAM_DEPTH_REG);
etb_sr = readl_relaxed(drvdata->base + ETB_STATUS_REG);
etb_rrp = readl_relaxed(drvdata->base + ETB_RAM_READ_POINTER);
etb_rwp = readl_relaxed(drvdata->base + ETB_RAM_WRITE_POINTER);
etb_trg = readl_relaxed(drvdata->base + ETB_TRG);
etb_cr = readl_relaxed(drvdata->base + ETB_CTL_REG);
etb_ffsr = readl_relaxed(drvdata->base + ETB_FFSR);
etb_ffcr = readl_relaxed(drvdata->base + ETB_FFCR);
CS_LOCK(drvdata->base);
spin_unlock_irqrestore(&drvdata->spinlock, flags);
pm_runtime_put(drvdata->dev);
return sprintf(buf,
"Depth:\t\t0x%x\n"
"Status:\t\t0x%x\n"
"RAM read ptr:\t0x%x\n"
"RAM wrt ptr:\t0x%x\n"
"Trigger cnt:\t0x%x\n"
"Control:\t0x%x\n"
"Flush status:\t0x%x\n"
"Flush ctrl:\t0x%x\n",
etb_rdr, etb_sr, etb_rrp, etb_rwp,
etb_trg, etb_cr, etb_ffsr, etb_ffcr);
return -EINVAL;
}
static DEVICE_ATTR_RO(status);
static struct attribute *coresight_etb_mgmt_attrs[] = {
&dev_attr_rdp.attr,
&dev_attr_sts.attr,
&dev_attr_rrp.attr,
&dev_attr_rwp.attr,
&dev_attr_trg.attr,
&dev_attr_ctl.attr,
&dev_attr_ffsr.attr,
&dev_attr_ffcr.attr,
NULL,
};
static ssize_t trigger_cntr_show(struct device *dev,
struct device_attribute *attr, char *buf)
@ -649,10 +631,23 @@ static DEVICE_ATTR_RW(trigger_cntr);
static struct attribute *coresight_etb_attrs[] = {
&dev_attr_trigger_cntr.attr,
&dev_attr_status.attr,
NULL,
};
ATTRIBUTE_GROUPS(coresight_etb);
static const struct attribute_group coresight_etb_group = {
.attrs = coresight_etb_attrs,
};
static const struct attribute_group coresight_etb_mgmt_group = {
.attrs = coresight_etb_mgmt_attrs,
.name = "mgmt",
};
const struct attribute_group *coresight_etb_groups[] = {
&coresight_etb_group,
&coresight_etb_mgmt_group,
NULL,
};
static int etb_probe(struct amba_device *adev, const struct amba_id *id)
{