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Subject[GIT PULL 14/15] intel_th: Add global activate/deactivate callbacks for the glue layers
Date
A glue layer may want to install its own hooks into trace capture start
and stop paths to apply workarounds. This adds optional callbacks.

Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
---
drivers/hwtracing/intel_th/core.c | 26 ++++++++++++++++++++++----
drivers/hwtracing/intel_th/intel_th.h | 2 ++
2 files changed, 24 insertions(+), 4 deletions(-)

diff --git a/drivers/hwtracing/intel_th/core.c b/drivers/hwtracing/intel_th/core.c
index e915ab24f4..998e3e5507 100644
--- a/drivers/hwtracing/intel_th/core.c
+++ b/drivers/hwtracing/intel_th/core.c
@@ -226,6 +226,7 @@ static int intel_th_output_activate(struct intel_th_device *thdev)
{
struct intel_th_driver *thdrv =
to_intel_th_driver_or_null(thdev->dev.driver);
+ struct intel_th *th = to_intel_th(thdev);
int ret = 0;

if (!thdrv)
@@ -236,15 +237,28 @@ static int intel_th_output_activate(struct intel_th_device *thdev)

pm_runtime_get_sync(&thdev->dev);

+ if (th->activate)
+ ret = th->activate(th);
+ if (ret)
+ goto fail_put;
+
if (thdrv->activate)
ret = thdrv->activate(thdev);
else
intel_th_trace_enable(thdev);

- if (ret) {
- pm_runtime_put(&thdev->dev);
- module_put(thdrv->driver.owner);
- }
+ if (ret)
+ goto fail_deactivate;
+
+ return 0;
+
+fail_deactivate:
+ if (th->deactivate)
+ th->deactivate(th);
+
+fail_put:
+ pm_runtime_put(&thdev->dev);
+ module_put(thdrv->driver.owner);

return ret;
}
@@ -253,6 +267,7 @@ static void intel_th_output_deactivate(struct intel_th_device *thdev)
{
struct intel_th_driver *thdrv =
to_intel_th_driver_or_null(thdev->dev.driver);
+ struct intel_th *th = to_intel_th(thdev);

if (!thdrv)
return;
@@ -262,6 +277,9 @@ static void intel_th_output_deactivate(struct intel_th_device *thdev)
else
intel_th_trace_disable(thdev);

+ if (th->deactivate)
+ th->deactivate(th);
+
pm_runtime_put(&thdev->dev);
module_put(thdrv->driver.owner);
}
diff --git a/drivers/hwtracing/intel_th/intel_th.h b/drivers/hwtracing/intel_th/intel_th.h
index 68244602ca..78a4fb28b1 100644
--- a/drivers/hwtracing/intel_th/intel_th.h
+++ b/drivers/hwtracing/intel_th/intel_th.h
@@ -263,6 +263,8 @@ struct intel_th {
struct intel_th_drvdata *drvdata;

struct resource *resource;
+ int (*activate)(struct intel_th *);
+ void (*deactivate)(struct intel_th *);
unsigned int num_thdevs;
unsigned int num_resources;
int irq;
--
2.14.1
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