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authorAlexander Shishkin <alexander.shishkin@linux.intel.com>2021-06-21 18:12:46 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2021-06-24 16:49:32 +0300
commitab1afed701d2db7eb35c1a2526a29067a38e93d1 (patch)
tree0888e6550d12eed8e6d115ecb4c331c74c259905 /drivers/hwtracing
parent02ca71effb96595fb7e0a17df1aaedc5d2e30747 (diff)
downloadlinux-ab1afed701d2db7eb35c1a2526a29067a38e93d1.tar.xz
intel_th: Wait until port is in reset before programming it
Some devices don't drain their pipelines if we don't make sure that the corresponding output port is in reset before programming it for a new trace capture, resulting in bits of old trace appearing in the new trace capture. Fix that by explicitly making sure the reset is asserted before programming new trace capture. Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Link: https://lore.kernel.org/r/20210621151246.31891-5-alexander.shishkin@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hwtracing')
-rw-r--r--drivers/hwtracing/intel_th/core.c17
-rw-r--r--drivers/hwtracing/intel_th/gth.c16
-rw-r--r--drivers/hwtracing/intel_th/intel_th.h3
3 files changed, 36 insertions, 0 deletions
diff --git a/drivers/hwtracing/intel_th/core.c b/drivers/hwtracing/intel_th/core.c
index 4bf025ef2031..66eed2dff818 100644
--- a/drivers/hwtracing/intel_th/core.c
+++ b/drivers/hwtracing/intel_th/core.c
@@ -217,6 +217,22 @@ static ssize_t port_show(struct device *dev, struct device_attribute *attr,
static DEVICE_ATTR_RO(port);
+static void intel_th_trace_prepare(struct intel_th_device *thdev)
+{
+ struct intel_th_device *hub = to_intel_th_hub(thdev);
+ struct intel_th_driver *hubdrv = to_intel_th_driver(hub->dev.driver);
+
+ if (hub->type != INTEL_TH_SWITCH)
+ return;
+
+ if (thdev->type != INTEL_TH_OUTPUT)
+ return;
+
+ pm_runtime_get_sync(&thdev->dev);
+ hubdrv->prepare(hub, &thdev->output);
+ pm_runtime_put(&thdev->dev);
+}
+
static int intel_th_output_activate(struct intel_th_device *thdev)
{
struct intel_th_driver *thdrv =
@@ -237,6 +253,7 @@ static int intel_th_output_activate(struct intel_th_device *thdev)
if (ret)
goto fail_put;
+ intel_th_trace_prepare(thdev);
if (thdrv->activate)
ret = thdrv->activate(thdev);
else
diff --git a/drivers/hwtracing/intel_th/gth.c b/drivers/hwtracing/intel_th/gth.c
index 28509b02a0b5..b3308934a687 100644
--- a/drivers/hwtracing/intel_th/gth.c
+++ b/drivers/hwtracing/intel_th/gth.c
@@ -564,6 +564,21 @@ static void gth_tscu_resync(struct gth_device *gth)
iowrite32(reg, gth->base + REG_TSCU_TSUCTRL);
}
+static void intel_th_gth_prepare(struct intel_th_device *thdev,
+ struct intel_th_output *output)
+{
+ struct gth_device *gth = dev_get_drvdata(&thdev->dev);
+ int count;
+
+ /*
+ * Wait until the output port is in reset before we start
+ * programming it.
+ */
+ for (count = GTH_PLE_WAITLOOP_DEPTH;
+ count && !(gth_output_get(gth, output->port) & BIT(5)); count--)
+ cpu_relax();
+}
+
/**
* intel_th_gth_enable() - enable tracing to an output device
* @thdev: GTH device
@@ -815,6 +830,7 @@ static struct intel_th_driver intel_th_gth_driver = {
.assign = intel_th_gth_assign,
.unassign = intel_th_gth_unassign,
.set_output = intel_th_gth_set_output,
+ .prepare = intel_th_gth_prepare,
.enable = intel_th_gth_enable,
.trig_switch = intel_th_gth_switch,
.disable = intel_th_gth_disable,
diff --git a/drivers/hwtracing/intel_th/intel_th.h b/drivers/hwtracing/intel_th/intel_th.h
index 89c67e0e1d34..0ffb42990175 100644
--- a/drivers/hwtracing/intel_th/intel_th.h
+++ b/drivers/hwtracing/intel_th/intel_th.h
@@ -143,6 +143,7 @@ intel_th_output_assigned(struct intel_th_device *thdev)
* @remove: remove method
* @assign: match a given output type device against available outputs
* @unassign: deassociate an output type device from an output port
+ * @prepare: prepare output port for tracing
* @enable: enable tracing for a given output device
* @disable: disable tracing for a given output device
* @irq: interrupt callback
@@ -164,6 +165,8 @@ struct intel_th_driver {
struct intel_th_device *othdev);
void (*unassign)(struct intel_th_device *thdev,
struct intel_th_device *othdev);
+ void (*prepare)(struct intel_th_device *thdev,
+ struct intel_th_output *output);
void (*enable)(struct intel_th_device *thdev,
struct intel_th_output *output);
void (*trig_switch)(struct intel_th_device *thdev,