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// 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;
}
drm_WARN(&dev_priv->drm, 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)
{
struct drm_i915_private *i915 = to_i915(state->base.dev);
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_dbg_atomic(&i915->drm, "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) {
drm_WARN_ON(&dev_priv->drm, 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;
}
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