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intel_th: msu: Factor out pipeline draining 

The code that waits for the pipeline empty condition of the MSU is
currently called in the path that disables the trace. We will also
need this in the window switch trigger sequence. Therefore, factor
out this code and make it accessible to the GTH device.

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 11:44:46 +03:00 committed by Greg Kroah-Hartman
parent ba39bd8306
commit 8d4155126e
3 changed files with 29 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/hwtracing/intel_th/gth.c
View File

@ -469,6 +469,10 @@ 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;
@ -492,6 +496,9 @@ static void intel_th_gth_disable(struct intel_th_device *thdev,
cpu_relax();
}
if (outdrv->wait_empty)
outdrv->wait_empty(outdev);
/* clear force capture done for next captures */
iowrite32(0xfc, gth->base + REG_GTH_SCR2);

4
drivers/hwtracing/intel_th/intel_th.h
View File

@ -20,6 +20,8 @@ enum {
INTEL_TH_SWITCH,
};
struct intel_th_device;
/**
* struct intel_th_output - descriptor INTEL_TH_OUTPUT type devices
* @port: output port number, assigned by the switch
@ -27,6 +29,7 @@ enum {
* @scratchpad: scratchpad bits to flag when this output is enabled
* @multiblock: true for multiblock output configuration
* @active: true when this output is enabled
* @wait_empty: wait for device pipeline to be empty
*
* Output port descriptor, used by switch driver to tell which output
* port this output device corresponds to. Filled in at output device's
@ -165,6 +168,7 @@ struct intel_th_driver {
struct intel_th_output *output);
/* output ops */
irqreturn_t (*irq)(struct intel_th_device *thdev);
void (*wait_empty)(struct intel_th_device *thdev);
int (*activate)(struct intel_th_device *thdev);
void (*deactivate)(struct intel_th_device *thdev);
/* file_operations for those who want a device node */

28
drivers/hwtracing/intel_th/msu.c
View File

@ -577,23 +577,14 @@ static int msc_configure(struct msc *msc)
*/
static void msc_disable(struct msc *msc)
{
unsigned long count;
u32 reg;
lockdep_assert_held(&msc->buf_mutex);
intel_th_trace_disable(msc->thdev);
for (reg = 0, count = MSC_PLE_WAITLOOP_DEPTH;
count && !(reg & MSCSTS_PLE); count--) {
reg = ioread32(msc->reg_base + REG_MSU_MSC0STS);
cpu_relax();
}
if (!count)
dev_dbg(msc_dev(msc), "timeout waiting for MSC0 PLE\n");
if (msc->mode == MSC_MODE_SINGLE) {
reg = ioread32(msc->reg_base + REG_MSU_MSC0STS);
msc->single_wrap = !!(reg & MSCSTS_WRAPSTAT);
reg = ioread32(msc->reg_base + REG_MSU_MSC0MWP);
@ -1360,6 +1351,22 @@ static const struct file_operations intel_th_msc_fops = {
.owner = THIS_MODULE,
};
static void intel_th_msc_wait_empty(struct intel_th_device *thdev)
{
struct msc *msc = dev_get_drvdata(&thdev->dev);
unsigned long count;
u32 reg;
for (reg = 0, count = MSC_PLE_WAITLOOP_DEPTH;
count && !(reg & MSCSTS_PLE); count--) {
reg = __raw_readl(msc->reg_base + REG_MSU_MSC0STS);
cpu_relax();
}
if (!count)
dev_dbg(msc_dev(msc), "timeout waiting for MSC0 PLE\n");
}
static int intel_th_msc_init(struct msc *msc)
{
atomic_set(&msc->user_count, -1);
@ -1640,6 +1647,7 @@ static struct intel_th_driver intel_th_msc_driver = {
.probe = intel_th_msc_probe,
.remove = intel_th_msc_remove,
.irq = intel_th_msc_interrupt,
.wait_empty = intel_th_msc_wait_empty,
.activate = intel_th_msc_activate,
.deactivate = intel_th_msc_deactivate,
.fops = &intel_th_msc_fops,