linux/drivers/gpu/drm/i915/gem/i915_gem_throttle.c

/*
 * SPDX-License-Identifier: MIT
 *
 * Copyright © 2014-2016 Intel Corporation
 */

#include <linux/jiffies.h>

#include <drm/drm_file.h>

#include "i915_drv.h"
#include "i915_file_private.h"
#include "i915_gem_context.h"
#include "i915_gem_ioctls.h"
#include "i915_gem_object.h"

/*
 * 20ms is a fairly arbitrary limit (greater than the average frame time)
 * chosen to prevent the CPU getting more than a frame ahead of the GPU
 * (when using lax throttling for the frontbuffer). We also use it to
 * offer free GPU waitboosts for severely congested workloads.
 */
#define DRM_I915_THROTTLE_JIFFIES …

/*
 * Throttle our rendering by waiting until the ring has completed our requests
 * emitted over 20 msec ago.
 *
 * Note that if we were to use the current jiffies each time around the loop,
 * we wouldn't escape the function with any frames outstanding if the time to
 * render a frame was over 20ms.
 *
 * This should get us reasonable parallelism between CPU and GPU but also
 * relatively low latency when blocking on a particular request to finish.
 */
int
i915_gem_throttle_ioctl(struct drm_device *dev, void *data,
			struct drm_file *file)
{ … }