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intel_th: Add global activate/deactivate callbacks for the glue layers 

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>
This commit is contained in:
Alexander Shishkin 2017-08-25 15:47:22 +03:00
parent 3321371b5d
commit 29e15e83a9
2 changed files with 24 additions and 4 deletions
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26
drivers/hwtracing/intel_th/core.c
View File

@ -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);
}

2
drivers/hwtracing/intel_th/intel_th.h
View File

@ -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;