diff options
Diffstat (limited to 'drivers/gpu/drm/vc4/vc4_kms.c')
| -rw-r--r-- | drivers/gpu/drm/vc4/vc4_kms.c | 122 |
1 files changed, 121 insertions, 1 deletions
diff --git a/drivers/gpu/drm/vc4/vc4_kms.c b/drivers/gpu/drm/vc4/vc4_kms.c index 91b8c72ff361..5160cad25fce 100644 --- a/drivers/gpu/drm/vc4/vc4_kms.c +++ b/drivers/gpu/drm/vc4/vc4_kms.c @@ -34,6 +34,18 @@ static struct vc4_ctm_state *to_vc4_ctm_state(struct drm_private_state *priv) return container_of(priv, struct vc4_ctm_state, base); } +struct vc4_load_tracker_state { + struct drm_private_state base; + u64 hvs_load; + u64 membus_load; +}; + +static struct vc4_load_tracker_state * +to_vc4_load_tracker_state(struct drm_private_state *priv) +{ + return container_of(priv, struct vc4_load_tracker_state, base); +} + static struct vc4_ctm_state *vc4_get_ctm_state(struct drm_atomic_state *state, struct drm_private_obj *manager) { @@ -138,6 +150,16 @@ vc4_atomic_complete_commit(struct drm_atomic_state *state) { struct drm_device *dev = state->dev; struct vc4_dev *vc4 = to_vc4_dev(dev); + struct vc4_crtc *vc4_crtc; + int i; + + for (i = 0; i < dev->mode_config.num_crtc; i++) { + if (!state->crtcs[i].ptr || !state->crtcs[i].commit) + continue; + + vc4_crtc = to_vc4_crtc(state->crtcs[i].ptr); + vc4_hvs_mask_underrun(dev, vc4_crtc->channel); + } drm_atomic_helper_wait_for_fences(dev, state, false); @@ -385,6 +407,85 @@ vc4_ctm_atomic_check(struct drm_device *dev, struct drm_atomic_state *state) return 0; } +static int vc4_load_tracker_atomic_check(struct drm_atomic_state *state) +{ + struct drm_plane_state *old_plane_state, *new_plane_state; + struct vc4_dev *vc4 = to_vc4_dev(state->dev); + struct vc4_load_tracker_state *load_state; + struct drm_private_state *priv_state; + struct drm_plane *plane; + int i; + + priv_state = drm_atomic_get_private_obj_state(state, + &vc4->load_tracker); + if (IS_ERR(priv_state)) + return PTR_ERR(priv_state); + + load_state = to_vc4_load_tracker_state(priv_state); + for_each_oldnew_plane_in_state(state, plane, old_plane_state, + new_plane_state, i) { + struct vc4_plane_state *vc4_plane_state; + + if (old_plane_state->fb && old_plane_state->crtc) { + vc4_plane_state = to_vc4_plane_state(old_plane_state); + load_state->membus_load -= vc4_plane_state->membus_load; + load_state->hvs_load -= vc4_plane_state->hvs_load; + } + + if (new_plane_state->fb && new_plane_state->crtc) { + vc4_plane_state = to_vc4_plane_state(new_plane_state); + load_state->membus_load += vc4_plane_state->membus_load; + load_state->hvs_load += vc4_plane_state->hvs_load; + } + } + + /* Don't check the load when the tracker is disabled. */ + if (!vc4->load_tracker_enabled) + return 0; + + /* The absolute limit is 2Gbyte/sec, but let's take a margin to let + * the system work when other blocks are accessing the memory. + */ + if (load_state->membus_load > SZ_1G + SZ_512M) + return -ENOSPC; + + /* HVS clock is supposed to run @ 250Mhz, let's take a margin and + * consider the maximum number of cycles is 240M. + */ + if (load_state->hvs_load > 240000000ULL) + return -ENOSPC; + + return 0; +} + +static struct drm_private_state * +vc4_load_tracker_duplicate_state(struct drm_private_obj *obj) +{ + struct vc4_load_tracker_state *state; + + state = kmemdup(obj->state, sizeof(*state), GFP_KERNEL); + if (!state) + return NULL; + + __drm_atomic_helper_private_obj_duplicate_state(obj, &state->base); + + return &state->base; +} + +static void vc4_load_tracker_destroy_state(struct drm_private_obj *obj, + struct drm_private_state *state) +{ + struct vc4_load_tracker_state *load_state; + + load_state = to_vc4_load_tracker_state(state); + kfree(load_state); +} + +static const struct drm_private_state_funcs vc4_load_tracker_state_funcs = { + .atomic_duplicate_state = vc4_load_tracker_duplicate_state, + .atomic_destroy_state = vc4_load_tracker_destroy_state, +}; + static int vc4_atomic_check(struct drm_device *dev, struct drm_atomic_state *state) { @@ -394,7 +495,11 @@ vc4_atomic_check(struct drm_device *dev, struct drm_atomic_state *state) if (ret < 0) return ret; - return drm_atomic_helper_check(dev, state); + ret = drm_atomic_helper_check(dev, state); + if (ret) + return ret; + + return vc4_load_tracker_atomic_check(state); } static const struct drm_mode_config_funcs vc4_mode_funcs = { @@ -407,8 +512,14 @@ int vc4_kms_load(struct drm_device *dev) { struct vc4_dev *vc4 = to_vc4_dev(dev); struct vc4_ctm_state *ctm_state; + struct vc4_load_tracker_state *load_state; int ret; + /* Start with the load tracker enabled. Can be disabled through the + * debugfs load_tracker file. + */ + vc4->load_tracker_enabled = true; + sema_init(&vc4->async_modeset, 1); /* Set support for vblank irq fast disable, before drm_vblank_init() */ @@ -436,6 +547,15 @@ int vc4_kms_load(struct drm_device *dev) drm_atomic_private_obj_init(dev, &vc4->ctm_manager, &ctm_state->base, &vc4_ctm_state_funcs); + load_state = kzalloc(sizeof(*load_state), GFP_KERNEL); + if (!load_state) { + drm_atomic_private_obj_fini(&vc4->ctm_manager); + return -ENOMEM; + } + + drm_atomic_private_obj_init(dev, &vc4->load_tracker, &load_state->base, + &vc4_load_tracker_state_funcs); + drm_mode_config_reset(dev); drm_kms_helper_poll_init(dev); |