blob: 09c012d54d58f646c4f4b3c42818de52ad0877cd [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0+
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_vblank.h>
#include "vkms_drv.h"
static enum hrtimer_restart vkms_vblank_simulate(struct hrtimer *timer)
{
struct vkms_output *output = container_of(timer, struct vkms_output,
vblank_hrtimer);
struct drm_crtc *crtc = &output->crtc;
struct vkms_crtc_state *state;
u64 ret_overrun;
bool ret;
ret_overrun = hrtimer_forward_now(&output->vblank_hrtimer,
output->period_ns);
WARN_ON(ret_overrun != 1);
spin_lock(&output->lock);
ret = drm_crtc_handle_vblank(crtc);
if (!ret)
DRM_ERROR("vkms failure on handling vblank");
state = output->composer_state;
spin_unlock(&output->lock);
if (state && output->composer_enabled) {
u64 frame = drm_crtc_accurate_vblank_count(crtc);
/* update frame_start only if a queued vkms_composer_worker()
* has read the data
*/
spin_lock(&output->composer_lock);
if (!state->crc_pending)
state->frame_start = frame;
else
DRM_DEBUG_DRIVER("crc worker falling behind, frame_start: %llu, frame_end: %llu\n",
state->frame_start, frame);
state->frame_end = frame;
state->crc_pending = true;
spin_unlock(&output->composer_lock);
ret = queue_work(output->composer_workq, &state->composer_work);
if (!ret)
DRM_DEBUG_DRIVER("Composer worker already queued\n");
}
return HRTIMER_RESTART;
}
static int vkms_enable_vblank(struct drm_crtc *crtc)
{
struct drm_device *dev = crtc->dev;
unsigned int pipe = drm_crtc_index(crtc);
struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
struct vkms_output *out = drm_crtc_to_vkms_output(crtc);
drm_calc_timestamping_constants(crtc, &crtc->mode);
hrtimer_init(&out->vblank_hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
out->vblank_hrtimer.function = &vkms_vblank_simulate;
out->period_ns = ktime_set(0, vblank->framedur_ns);
hrtimer_start(&out->vblank_hrtimer, out->period_ns, HRTIMER_MODE_REL);
return 0;
}
static void vkms_disable_vblank(struct drm_crtc *crtc)
{
struct vkms_output *out = drm_crtc_to_vkms_output(crtc);
hrtimer_cancel(&out->vblank_hrtimer);
}
static bool vkms_get_vblank_timestamp(struct drm_crtc *crtc,
int *max_error, ktime_t *vblank_time,
bool in_vblank_irq)
{
struct drm_device *dev = crtc->dev;
unsigned int pipe = crtc->index;
struct vkms_device *vkmsdev = drm_device_to_vkms_device(dev);
struct vkms_output *output = &vkmsdev->output;
struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
if (!READ_ONCE(vblank->enabled)) {
*vblank_time = ktime_get();
return true;
}
*vblank_time = READ_ONCE(output->vblank_hrtimer.node.expires);
if (WARN_ON(*vblank_time == vblank->time))
return true;
/*
* To prevent races we roll the hrtimer forward before we do any
* interrupt processing - this is how real hw works (the interrupt is
* only generated after all the vblank registers are updated) and what
* the vblank core expects. Therefore we need to always correct the
* timestampe by one frame.
*/
*vblank_time -= output->period_ns;
return true;
}
static struct drm_crtc_state *
vkms_atomic_crtc_duplicate_state(struct drm_crtc *crtc)
{
struct vkms_crtc_state *vkms_state;
if (WARN_ON(!crtc->state))
return NULL;
vkms_state = kzalloc(sizeof(*vkms_state), GFP_KERNEL);
if (!vkms_state)
return NULL;
__drm_atomic_helper_crtc_duplicate_state(crtc, &vkms_state->base);
INIT_WORK(&vkms_state->composer_work, vkms_composer_worker);
return &vkms_state->base;
}
static void vkms_atomic_crtc_destroy_state(struct drm_crtc *crtc,
struct drm_crtc_state *state)
{
struct vkms_crtc_state *vkms_state = to_vkms_crtc_state(state);
__drm_atomic_helper_crtc_destroy_state(state);
WARN_ON(work_pending(&vkms_state->composer_work));
kfree(vkms_state->active_planes);
kfree(vkms_state);
}
static void vkms_atomic_crtc_reset(struct drm_crtc *crtc)
{
struct vkms_crtc_state *vkms_state =
kzalloc(sizeof(*vkms_state), GFP_KERNEL);
if (crtc->state)
vkms_atomic_crtc_destroy_state(crtc, crtc->state);
__drm_atomic_helper_crtc_reset(crtc, &vkms_state->base);
if (vkms_state)
INIT_WORK(&vkms_state->composer_work, vkms_composer_worker);
}
static const struct drm_crtc_funcs vkms_crtc_funcs = {
.set_config = drm_atomic_helper_set_config,
.destroy = drm_crtc_cleanup,
.page_flip = drm_atomic_helper_page_flip,
.reset = vkms_atomic_crtc_reset,
.atomic_duplicate_state = vkms_atomic_crtc_duplicate_state,
.atomic_destroy_state = vkms_atomic_crtc_destroy_state,
.enable_vblank = vkms_enable_vblank,
.disable_vblank = vkms_disable_vblank,
.get_vblank_timestamp = vkms_get_vblank_timestamp,
.get_crc_sources = vkms_get_crc_sources,
.set_crc_source = vkms_set_crc_source,
.verify_crc_source = vkms_verify_crc_source,
};
static int vkms_crtc_atomic_check(struct drm_crtc *crtc,
struct drm_crtc_state *state)
{
struct vkms_crtc_state *vkms_state = to_vkms_crtc_state(state);
struct drm_plane *plane;
struct drm_plane_state *plane_state;
int i = 0, ret;
if (vkms_state->active_planes)
return 0;
ret = drm_atomic_add_affected_planes(state->state, crtc);
if (ret < 0)
return ret;
drm_for_each_plane_mask(plane, crtc->dev, state->plane_mask) {
plane_state = drm_atomic_get_existing_plane_state(state->state,
plane);
WARN_ON(!plane_state);
if (!plane_state->visible)
continue;
i++;
}
vkms_state->active_planes = kcalloc(i, sizeof(plane), GFP_KERNEL);
if (!vkms_state->active_planes)
return -ENOMEM;
vkms_state->num_active_planes = i;
i = 0;
drm_for_each_plane_mask(plane, crtc->dev, state->plane_mask) {
plane_state = drm_atomic_get_existing_plane_state(state->state,
plane);
if (!plane_state->visible)
continue;
vkms_state->active_planes[i++] =
to_vkms_plane_state(plane_state);
}
return 0;
}
static void vkms_crtc_atomic_enable(struct drm_crtc *crtc,
struct drm_crtc_state *old_state)
{
drm_crtc_vblank_on(crtc);
}
static void vkms_crtc_atomic_disable(struct drm_crtc *crtc,
struct drm_crtc_state *old_state)
{
drm_crtc_vblank_off(crtc);
}
static void vkms_crtc_atomic_begin(struct drm_crtc *crtc,
struct drm_crtc_state *old_crtc_state)
{
struct vkms_output *vkms_output = drm_crtc_to_vkms_output(crtc);
/* This lock is held across the atomic commit to block vblank timer
* from scheduling vkms_composer_worker until the composer is updated
*/
spin_lock_irq(&vkms_output->lock);
}
static void vkms_crtc_atomic_flush(struct drm_crtc *crtc,
struct drm_crtc_state *old_crtc_state)
{
struct vkms_output *vkms_output = drm_crtc_to_vkms_output(crtc);
if (crtc->state->event) {
spin_lock(&crtc->dev->event_lock);
if (drm_crtc_vblank_get(crtc) != 0)
drm_crtc_send_vblank_event(crtc, crtc->state->event);
else
drm_crtc_arm_vblank_event(crtc, crtc->state->event);
spin_unlock(&crtc->dev->event_lock);
crtc->state->event = NULL;
}
vkms_output->composer_state = to_vkms_crtc_state(crtc->state);
spin_unlock_irq(&vkms_output->lock);
}
static const struct drm_crtc_helper_funcs vkms_crtc_helper_funcs = {
.atomic_check = vkms_crtc_atomic_check,
.atomic_begin = vkms_crtc_atomic_begin,
.atomic_flush = vkms_crtc_atomic_flush,
.atomic_enable = vkms_crtc_atomic_enable,
.atomic_disable = vkms_crtc_atomic_disable,
};
int vkms_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,
struct drm_plane *primary, struct drm_plane *cursor)
{
struct vkms_output *vkms_out = drm_crtc_to_vkms_output(crtc);
int ret;
ret = drm_crtc_init_with_planes(dev, crtc, primary, cursor,
&vkms_crtc_funcs, NULL);
if (ret) {
DRM_ERROR("Failed to init CRTC\n");
return ret;
}
drm_crtc_helper_add(crtc, &vkms_crtc_helper_funcs);
spin_lock_init(&vkms_out->lock);
spin_lock_init(&vkms_out->composer_lock);
vkms_out->composer_workq = alloc_ordered_workqueue("vkms_composer", 0);
if (!vkms_out->composer_workq)
return -ENOMEM;
return ret;
}