summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/vkms/vkms_crtc.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/gpu/drm/vkms/vkms_crtc.c')
-rw-r--r--drivers/gpu/drm/vkms/vkms_crtc.c302
1 files changed, 302 insertions, 0 deletions
diff --git a/drivers/gpu/drm/vkms/vkms_crtc.c b/drivers/gpu/drm/vkms/vkms_crtc.c
new file mode 100644
index 000000000..57bbd32e9
--- /dev/null
+++ b/drivers/gpu/drm/vkms/vkms_crtc.c
@@ -0,0 +1,302 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include <linux/dma-fence.h>
+
+#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, fence_cookie;
+
+ fence_cookie = dma_fence_begin_signalling();
+
+ ret_overrun = hrtimer_forward_now(&output->vblank_hrtimer,
+ output->period_ns);
+ if (ret_overrun != 1)
+ pr_warn("%s: vblank timer overrun\n", __func__);
+
+ 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");
+ }
+
+ dma_fence_end_signalling(fence_cookie);
+
+ 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_atomic_state *state)
+{
+ struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state,
+ crtc);
+ struct vkms_crtc_state *vkms_state = to_vkms_crtc_state(crtc_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(crtc_state->state, crtc);
+ if (ret < 0)
+ return ret;
+
+ drm_for_each_plane_mask(plane, crtc->dev, crtc_state->plane_mask) {
+ plane_state = drm_atomic_get_existing_plane_state(crtc_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, crtc_state->plane_mask) {
+ plane_state = drm_atomic_get_existing_plane_state(crtc_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_atomic_state *state)
+{
+ drm_crtc_vblank_on(crtc);
+}
+
+static void vkms_crtc_atomic_disable(struct drm_crtc *crtc,
+ struct drm_atomic_state *state)
+{
+ drm_crtc_vblank_off(crtc);
+}
+
+static void vkms_crtc_atomic_begin(struct drm_crtc *crtc,
+ struct drm_atomic_state *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_atomic_state *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;
+}