diff options
Diffstat (limited to 'drivers/gpu/drm/vkms/vkms_crtc.c')
| -rw-r--r-- | drivers/gpu/drm/vkms/vkms_crtc.c | 239 |
1 files changed, 239 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 000000000000..9a7db1d51022 --- /dev/null +++ b/drivers/gpu/drm/vkms/vkms_crtc.c @@ -0,0 +1,239 @@ +// 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_managed.h> +#include <drm/drm_print.h> +#include <drm/drm_probe_helper.h> +#include <drm/drm_vblank.h> +#include <drm/drm_vblank_helper.h> + +#include "vkms_drv.h" + +static bool vkms_crtc_handle_vblank_timeout(struct drm_crtc *crtc) +{ + struct vkms_output *output = drm_crtc_to_vkms_output(crtc); + struct vkms_crtc_state *state; + bool ret, fence_cookie; + + fence_cookie = dma_fence_begin_signalling(); + + 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 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, + .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, + DRM_CRTC_VBLANK_TIMER_FUNCS, + .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_new_plane_state(crtc_state->state, plane); + WARN_ON(!plane_state); + + if (!plane_state->visible) + continue; + + i++; + } + + vkms_state->active_planes = kcalloc(i, sizeof(*vkms_state->active_planes), 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_new_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_begin(struct drm_crtc *crtc, + struct drm_atomic_state *state) + __acquires(&vkms_output->lock) +{ + 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) + __releases(&vkms_output->lock) +{ + 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 = drm_crtc_vblank_atomic_enable, + .atomic_disable = drm_crtc_vblank_atomic_disable, + .handle_vblank_timeout = vkms_crtc_handle_vblank_timeout, +}; + +struct vkms_output *vkms_crtc_init(struct drm_device *dev, struct drm_plane *primary, + struct drm_plane *cursor) +{ + struct vkms_output *vkms_out; + struct drm_crtc *crtc; + int ret; + + vkms_out = drmm_crtc_alloc_with_planes(dev, struct vkms_output, crtc, + primary, cursor, + &vkms_crtc_funcs, NULL); + if (IS_ERR(vkms_out)) { + DRM_DEV_ERROR(dev->dev, "Failed to init CRTC\n"); + return vkms_out; + } + + crtc = &vkms_out->crtc; + + drm_crtc_helper_add(crtc, &vkms_crtc_helper_funcs); + + ret = drm_mode_crtc_set_gamma_size(crtc, VKMS_LUT_SIZE); + if (ret) { + DRM_ERROR("Failed to set gamma size\n"); + return ERR_PTR(ret); + } + + drm_crtc_enable_color_mgmt(crtc, 0, false, VKMS_LUT_SIZE); + + spin_lock_init(&vkms_out->lock); + spin_lock_init(&vkms_out->composer_lock); + + vkms_out->composer_workq = drmm_alloc_ordered_workqueue(dev, "vkms_composer", 0); + if (IS_ERR(vkms_out->composer_workq)) + return ERR_CAST(vkms_out->composer_workq); + + return vkms_out; +} |