diff options
Diffstat (limited to 'drivers/gpu/drm/i915/display/intel_global_state.c')
| -rw-r--r-- | drivers/gpu/drm/i915/display/intel_global_state.c | 223 |
1 files changed, 223 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/display/intel_global_state.c b/drivers/gpu/drm/i915/display/intel_global_state.c new file mode 100644 index 000000000000..a0cc894c3868 --- /dev/null +++ b/drivers/gpu/drm/i915/display/intel_global_state.c @@ -0,0 +1,223 @@ +// SPDX-License-Identifier: MIT +/* + * Copyright © 2020 Intel Corporation + */ + +#include <linux/string.h> + +#include "i915_drv.h" +#include "intel_atomic.h" +#include "intel_display_types.h" +#include "intel_global_state.h" + +void intel_atomic_global_obj_init(struct drm_i915_private *dev_priv, + struct intel_global_obj *obj, + struct intel_global_state *state, + const struct intel_global_state_funcs *funcs) +{ + memset(obj, 0, sizeof(*obj)); + + obj->state = state; + obj->funcs = funcs; + list_add_tail(&obj->head, &dev_priv->global_obj_list); +} + +void intel_atomic_global_obj_cleanup(struct drm_i915_private *dev_priv) +{ + struct intel_global_obj *obj, *next; + + list_for_each_entry_safe(obj, next, &dev_priv->global_obj_list, head) { + list_del(&obj->head); + obj->funcs->atomic_destroy_state(obj, obj->state); + } +} + +static void assert_global_state_write_locked(struct drm_i915_private *dev_priv) +{ + struct intel_crtc *crtc; + + for_each_intel_crtc(&dev_priv->drm, crtc) + drm_modeset_lock_assert_held(&crtc->base.mutex); +} + +static bool modeset_lock_is_held(struct drm_modeset_acquire_ctx *ctx, + struct drm_modeset_lock *lock) +{ + struct drm_modeset_lock *l; + + list_for_each_entry(l, &ctx->locked, head) { + if (lock == l) + return true; + } + + return false; +} + +static void assert_global_state_read_locked(struct intel_atomic_state *state) +{ + struct drm_modeset_acquire_ctx *ctx = state->base.acquire_ctx; + struct drm_i915_private *dev_priv = to_i915(state->base.dev); + struct intel_crtc *crtc; + + for_each_intel_crtc(&dev_priv->drm, crtc) { + if (modeset_lock_is_held(ctx, &crtc->base.mutex)) + return; + } + + WARN(1, "Global state not read locked\n"); +} + +struct intel_global_state * +intel_atomic_get_global_obj_state(struct intel_atomic_state *state, + struct intel_global_obj *obj) +{ + int index, num_objs, i; + size_t size; + struct __intel_global_objs_state *arr; + struct intel_global_state *obj_state; + + for (i = 0; i < state->num_global_objs; i++) + if (obj == state->global_objs[i].ptr) + return state->global_objs[i].state; + + assert_global_state_read_locked(state); + + num_objs = state->num_global_objs + 1; + size = sizeof(*state->global_objs) * num_objs; + arr = krealloc(state->global_objs, size, GFP_KERNEL); + if (!arr) + return ERR_PTR(-ENOMEM); + + state->global_objs = arr; + index = state->num_global_objs; + memset(&state->global_objs[index], 0, sizeof(*state->global_objs)); + + obj_state = obj->funcs->atomic_duplicate_state(obj); + if (!obj_state) + return ERR_PTR(-ENOMEM); + + obj_state->changed = false; + + state->global_objs[index].state = obj_state; + state->global_objs[index].old_state = obj->state; + state->global_objs[index].new_state = obj_state; + state->global_objs[index].ptr = obj; + obj_state->state = state; + + state->num_global_objs = num_objs; + + DRM_DEBUG_ATOMIC("Added new global object %p state %p to %p\n", + obj, obj_state, state); + + return obj_state; +} + +struct intel_global_state * +intel_atomic_get_old_global_obj_state(struct intel_atomic_state *state, + struct intel_global_obj *obj) +{ + int i; + + for (i = 0; i < state->num_global_objs; i++) + if (obj == state->global_objs[i].ptr) + return state->global_objs[i].old_state; + + return NULL; +} + +struct intel_global_state * +intel_atomic_get_new_global_obj_state(struct intel_atomic_state *state, + struct intel_global_obj *obj) +{ + int i; + + for (i = 0; i < state->num_global_objs; i++) + if (obj == state->global_objs[i].ptr) + return state->global_objs[i].new_state; + + return NULL; +} + +void intel_atomic_swap_global_state(struct intel_atomic_state *state) +{ + struct drm_i915_private *dev_priv = to_i915(state->base.dev); + struct intel_global_state *old_obj_state, *new_obj_state; + struct intel_global_obj *obj; + int i; + + for_each_oldnew_global_obj_in_state(state, obj, old_obj_state, + new_obj_state, i) { + WARN_ON(obj->state != old_obj_state); + + /* + * If the new state wasn't modified (and properly + * locked for write access) we throw it away. + */ + if (!new_obj_state->changed) + continue; + + assert_global_state_write_locked(dev_priv); + + old_obj_state->state = state; + new_obj_state->state = NULL; + + state->global_objs[i].state = old_obj_state; + obj->state = new_obj_state; + } +} + +void intel_atomic_clear_global_state(struct intel_atomic_state *state) +{ + int i; + + for (i = 0; i < state->num_global_objs; i++) { + struct intel_global_obj *obj = state->global_objs[i].ptr; + + obj->funcs->atomic_destroy_state(obj, + state->global_objs[i].state); + state->global_objs[i].ptr = NULL; + state->global_objs[i].state = NULL; + state->global_objs[i].old_state = NULL; + state->global_objs[i].new_state = NULL; + } + state->num_global_objs = 0; +} + +int intel_atomic_lock_global_state(struct intel_global_state *obj_state) +{ + struct intel_atomic_state *state = obj_state->state; + struct drm_i915_private *dev_priv = to_i915(state->base.dev); + struct intel_crtc *crtc; + + for_each_intel_crtc(&dev_priv->drm, crtc) { + int ret; + + ret = drm_modeset_lock(&crtc->base.mutex, + state->base.acquire_ctx); + if (ret) + return ret; + } + + obj_state->changed = true; + + return 0; +} + +int intel_atomic_serialize_global_state(struct intel_global_state *obj_state) +{ + struct intel_atomic_state *state = obj_state->state; + struct drm_i915_private *dev_priv = to_i915(state->base.dev); + struct intel_crtc *crtc; + + for_each_intel_crtc(&dev_priv->drm, crtc) { + struct intel_crtc_state *crtc_state; + + crtc_state = intel_atomic_get_crtc_state(&state->base, crtc); + if (IS_ERR(crtc_state)) + return PTR_ERR(crtc_state); + } + + obj_state->changed = true; + + return 0; +} |