// SPDX-License-Identifier: MIT
/*
 * Copyright © 2023 Intel Corporation
 */

#include <drm/drm_crtc.h>
#include <drm/drm_vblank.h>

#include "gt/intel_rps.h"
#include "i915_drv.h"
#include "i915_reg.h"
#include "intel_display_core.h"
#include "intel_display_irq.h"
#include "intel_display_rps.h"
#include "intel_display_types.h"

struct wait_rps_boost {
 struct wait_queue_entry wait;

 struct drm_crtc *crtc;
 struct i915_request *request;
};

static int do_rps_boost(struct wait_queue_entry *_wait,
   unsigned mode, int sync, void *key)
{
 struct wait_rps_boost *wait = container_of(_wait, typeof(*wait), wait);
 struct i915_request *rq = wait->request;

 /*
 * If we missed the vblank, but the request is already running it
 * is reasonable to assume that it will complete before the next
 * vblank without our intervention, so leave RPS alone.
 */
 if (!i915_request_started(rq))
  intel_rps_boost(rq);
 i915_request_put(rq);

 drm_crtc_vblank_put(wait->crtc);

 list_del(&wait->wait.entry);
 kfree(wait);
 return 1;
}

void intel_display_rps_boost_after_vblank(struct drm_crtc *crtc,
       struct dma_fence *fence)
{
 struct intel_display *display = to_intel_display(crtc->dev);
 struct wait_rps_boost *wait;

 if (!dma_fence_is_i915(fence))
  return;

 if (DISPLAY_VER(display) < 6)
  return;

 if (drm_crtc_vblank_get(crtc))
  return;

 wait = kmalloc(sizeof(*wait), GFP_KERNEL);
 if (!wait) {
  drm_crtc_vblank_put(crtc);
  return;
 }

 wait->request = to_request(dma_fence_get(fence));
 wait->crtc = crtc;

 wait->wait.func = do_rps_boost;
 wait->wait.flags = 0;

 add_wait_queue(drm_crtc_vblank_waitqueue(crtc), &wait->wait);
}

void intel_display_rps_mark_interactive(struct intel_display *display,
     struct intel_atomic_state *state,
     bool interactive)
{
 struct drm_i915_private *i915 = to_i915(display->drm);

 if (state->rps_interactive == interactive)
  return;

 intel_rps_mark_interactive(&to_gt(i915)->rps, interactive);
 state->rps_interactive = interactive;
}

void ilk_display_rps_enable(struct intel_display *display)
{
 spin_lock(&display->irq.lock);
 ilk_enable_display_irq(display, DE_PCU_EVENT);
 spin_unlock(&display->irq.lock);
}

void ilk_display_rps_disable(struct intel_display *display)
{
 spin_lock(&display->irq.lock);
 ilk_disable_display_irq(display, DE_PCU_EVENT);
 spin_unlock(&display->irq.lock);
}

void ilk_display_rps_irq_handler(struct intel_display *display)
{
 struct drm_i915_private *i915 = to_i915(display->drm);

 gen5_rps_irq_handler(&to_gt(i915)->rps);
}