diff options
| author | Alexander Shishkin <alexander.shishkin@linux.intel.com> | 2019-05-03 11:44:48 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-05-03 18:16:21 +0200 |
| commit | 8116db57cf1618cb21dab957952e7bd1395430da (patch) | |
| tree | a1ce61f74ac60388a76303e9e19b87c8322f89c5 /drivers/hwtracing/intel_th/core.c | |
| parent | 9958e02523eea424d4848ef426c5aa7e07e4e207 (diff) | |
| download | linux-rt-8116db57cf1618cb21dab957952e7bd1395430da.tar.gz | |
intel_th: Add switch triggering support
Add support for asserting window switch trigger when tracing to MSU output
ports. This allows for software controlled switching between windows of
the MSU buffer, which can be used for double buffering while exporting the
trace data further from the MSU.
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hwtracing/intel_th/core.c')
| -rw-r--r-- | drivers/hwtracing/intel_th/core.c | 25 |
1 files changed, 23 insertions, 2 deletions
diff --git a/drivers/hwtracing/intel_th/core.c b/drivers/hwtracing/intel_th/core.c index 390031df3edf..033dce563c99 100644 --- a/drivers/hwtracing/intel_th/core.c +++ b/drivers/hwtracing/intel_th/core.c @@ -430,9 +430,9 @@ static const struct intel_th_subdevice { .nres = 1, .res = { { - /* Handle TSCU from GTH driver */ + /* Handle TSCU and CTS from GTH driver */ .start = REG_GTH_OFFSET, - .end = REG_TSCU_OFFSET + REG_TSCU_LENGTH - 1, + .end = REG_CTS_OFFSET + REG_CTS_LENGTH - 1, .flags = IORESOURCE_MEM, }, }, @@ -988,6 +988,27 @@ int intel_th_trace_enable(struct intel_th_device *thdev) EXPORT_SYMBOL_GPL(intel_th_trace_enable); /** + * intel_th_trace_switch() - execute a switch sequence + * @thdev: output device that requests tracing switch + */ +int intel_th_trace_switch(struct intel_th_device *thdev) +{ + struct intel_th_device *hub = to_intel_th_device(thdev->dev.parent); + struct intel_th_driver *hubdrv = to_intel_th_driver(hub->dev.driver); + + if (WARN_ON_ONCE(hub->type != INTEL_TH_SWITCH)) + return -EINVAL; + + if (WARN_ON_ONCE(thdev->type != INTEL_TH_OUTPUT)) + return -EINVAL; + + hubdrv->trig_switch(hub, &thdev->output); + + return 0; +} +EXPORT_SYMBOL_GPL(intel_th_trace_switch); + +/** * intel_th_trace_disable() - disable tracing for an output device * @thdev: output device that requests tracing be disabled */ |