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intel_th: gth: Factor out trace start/stop 

The trace enable/disable functions of the GTH include the code that starts
and stops trace flom from the sources. This start/stop functionality will
also be used in the window switch trigger sequence.

Factor out start/stop code from the larger trace enable/disable code in
preparation for the window switch sequence.

Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alexander Shishkin 2019-05-03 11:44:47 +03:00 committed by Greg Kroah-Hartman
parent 8d4155126e
commit 9958e02523
1 changed files with 65 additions and 30 deletions
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95
drivers/hwtracing/intel_th/gth.c
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@ -456,6 +456,68 @@ static int intel_th_output_attributes(struct gth_device *gth)
return sysfs_create_group(&gth->dev->kobj, &gth->output_group);
}
/**
* intel_th_gth_stop() - stop tracing to an output device
* @gth: GTH device
* @output: output device's descriptor
* @capture_done: set when no more traces will be captured
*
* This will stop tracing using force storeEn off signal and wait for the
* pipelines to be empty for the corresponding output port.
*/
static void intel_th_gth_stop(struct gth_device *gth,
struct intel_th_output *output,
bool capture_done)
{
struct intel_th_device *outdev =
container_of(output, struct intel_th_device, output);
struct intel_th_driver *outdrv =
to_intel_th_driver(outdev->dev.driver);
unsigned long count;
u32 reg;
u32 scr2 = 0xfc | (capture_done ? 1 : 0);
iowrite32(0, gth->base + REG_GTH_SCR);
iowrite32(scr2, gth->base + REG_GTH_SCR2);
/* wait on pipeline empty for the given port */
for (reg = 0, count = GTH_PLE_WAITLOOP_DEPTH;
count && !(reg & BIT(output->port)); count--) {
reg = ioread32(gth->base + REG_GTH_STAT);
cpu_relax();
}
if (!count)
dev_dbg(gth->dev, "timeout waiting for GTH[%d] PLE\n",
output->port);
/* wait on output piepline empty */
if (outdrv->wait_empty)
outdrv->wait_empty(outdev);
/* clear force capture done for next captures */
iowrite32(0xfc, gth->base + REG_GTH_SCR2);
}
/**
* intel_th_gth_start() - start tracing to an output device
* @gth: GTH device
* @output: output device's descriptor
*
* This will start tracing using force storeEn signal.
*/
static void intel_th_gth_start(struct gth_device *gth,
struct intel_th_output *output)
{
u32 scr = 0xfc0000;
if (output->multiblock)
scr |= 0xff;
iowrite32(scr, gth->base + REG_GTH_SCR);
iowrite32(0, gth->base + REG_GTH_SCR2);
}
/**
* intel_th_gth_disable() - disable tracing to an output device
* @thdev: GTH device
@ -469,11 +531,6 @@ static void intel_th_gth_disable(struct intel_th_device *thdev,
struct intel_th_output *output)
{
struct gth_device *gth = dev_get_drvdata(&thdev->dev);
struct intel_th_device *outdev =
container_of(output, struct intel_th_device, output);
struct intel_th_driver *outdrv =
to_intel_th_driver(outdev->dev.driver);
unsigned long count;
int master;
u32 reg;
@ -486,25 +543,7 @@ static void intel_th_gth_disable(struct intel_th_device *thdev,
}
spin_unlock(&gth->gth_lock);
iowrite32(0, gth->base + REG_GTH_SCR);
iowrite32(0xfd, gth->base + REG_GTH_SCR2);
/* wait on pipeline empty for the given port */
for (reg = 0, count = GTH_PLE_WAITLOOP_DEPTH;
count && !(reg & BIT(output->port)); count--) {
reg = ioread32(gth->base + REG_GTH_STAT);
cpu_relax();
}
if (outdrv->wait_empty)
outdrv->wait_empty(outdev);
/* clear force capture done for next captures */
iowrite32(0xfc, gth->base + REG_GTH_SCR2);
if (!count)
dev_dbg(&thdev->dev, "timeout waiting for GTH[%d] PLE\n",
output->port);
intel_th_gth_stop(gth, output, true);
reg = ioread32(gth->base + REG_GTH_SCRPD0);
reg &= ~output->scratchpad;
@ -533,8 +572,8 @@ static void intel_th_gth_enable(struct intel_th_device *thdev,
{
struct gth_device *gth = dev_get_drvdata(&thdev->dev);
struct intel_th *th = to_intel_th(thdev);
u32 scr = 0xfc0000, scrpd;
int master;
u32 scrpd;
spin_lock(&gth->gth_lock);
for_each_set_bit(master, gth->output[output->port].master,
@ -542,9 +581,6 @@ static void intel_th_gth_enable(struct intel_th_device *thdev,
gth_master_set(gth, master, output->port);
}
if (output->multiblock)
scr |= 0xff;
output->active = true;
spin_unlock(&gth->gth_lock);
@ -555,8 +591,7 @@ static void intel_th_gth_enable(struct intel_th_device *thdev,
scrpd |= output->scratchpad;
iowrite32(scrpd, gth->base + REG_GTH_SCRPD0);
iowrite32(scr, gth->base + REG_GTH_SCR);
iowrite32(0, gth->base + REG_GTH_SCR2);
intel_th_gth_start(gth, output);
}
/**