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OpenCloudOS-Kernel/drivers/gpu/drm/drm_atomic.c

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/*
* Copyright (C) 2014 Red Hat
* Copyright (C) 2014 Intel Corp.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* Authors:
* Rob Clark <robdclark@gmail.com>
* Daniel Vetter <daniel.vetter@ffwll.ch>
*/
#include <drm/drmP.h>
#include <drm/drm_atomic.h>
#include <drm/drm_plane_helper.h>
static void kfree_state(struct drm_atomic_state *state)
{
kfree(state->connectors);
kfree(state->connector_states);
kfree(state->crtcs);
kfree(state->crtc_states);
kfree(state->planes);
kfree(state->plane_states);
kfree(state);
}
/**
* drm_atomic_state_alloc - allocate atomic state
* @dev: DRM device
*
* This allocates an empty atomic state to track updates.
*/
struct drm_atomic_state *
drm_atomic_state_alloc(struct drm_device *dev)
{
struct drm_atomic_state *state;
state = kzalloc(sizeof(*state), GFP_KERNEL);
if (!state)
return NULL;
/* TODO legacy paths should maybe do a better job about
* setting this appropriately?
*/
state->allow_modeset = true;
state->num_connector = ACCESS_ONCE(dev->mode_config.num_connector);
state->crtcs = kcalloc(dev->mode_config.num_crtc,
sizeof(*state->crtcs), GFP_KERNEL);
if (!state->crtcs)
goto fail;
state->crtc_states = kcalloc(dev->mode_config.num_crtc,
sizeof(*state->crtc_states), GFP_KERNEL);
if (!state->crtc_states)
goto fail;
state->planes = kcalloc(dev->mode_config.num_total_plane,
sizeof(*state->planes), GFP_KERNEL);
if (!state->planes)
goto fail;
state->plane_states = kcalloc(dev->mode_config.num_total_plane,
sizeof(*state->plane_states), GFP_KERNEL);
if (!state->plane_states)
goto fail;
state->connectors = kcalloc(state->num_connector,
sizeof(*state->connectors),
GFP_KERNEL);
if (!state->connectors)
goto fail;
state->connector_states = kcalloc(state->num_connector,
sizeof(*state->connector_states),
GFP_KERNEL);
if (!state->connector_states)
goto fail;
state->dev = dev;
DRM_DEBUG_ATOMIC("Allocate atomic state %p\n", state);
return state;
fail:
kfree_state(state);
return NULL;
}
EXPORT_SYMBOL(drm_atomic_state_alloc);
/**
* drm_atomic_state_clear - clear state object
* @state: atomic state
*
* When the w/w mutex algorithm detects a deadlock we need to back off and drop
* all locks. So someone else could sneak in and change the current modeset
* configuration. Which means that all the state assembled in @state is no
* longer an atomic update to the current state, but to some arbitrary earlier
* state. Which could break assumptions the driver's ->atomic_check likely
* relies on.
*
* Hence we must clear all cached state and completely start over, using this
* function.
*/
void drm_atomic_state_clear(struct drm_atomic_state *state)
{
struct drm_device *dev = state->dev;
struct drm_mode_config *config = &dev->mode_config;
int i;
DRM_DEBUG_ATOMIC("Clearing atomic state %p\n", state);
for (i = 0; i < state->num_connector; i++) {
struct drm_connector *connector = state->connectors[i];
if (!connector)
continue;
WARN_ON(!drm_modeset_is_locked(&config->connection_mutex));
connector->funcs->atomic_destroy_state(connector,
state->connector_states[i]);
state->connectors[i] = NULL;
state->connector_states[i] = NULL;
}
for (i = 0; i < config->num_crtc; i++) {
struct drm_crtc *crtc = state->crtcs[i];
if (!crtc)
continue;
crtc->funcs->atomic_destroy_state(crtc,
state->crtc_states[i]);
state->crtcs[i] = NULL;
state->crtc_states[i] = NULL;
}
for (i = 0; i < config->num_total_plane; i++) {
struct drm_plane *plane = state->planes[i];
if (!plane)
continue;
plane->funcs->atomic_destroy_state(plane,
state->plane_states[i]);
state->planes[i] = NULL;
state->plane_states[i] = NULL;
}
}
EXPORT_SYMBOL(drm_atomic_state_clear);
/**
* drm_atomic_state_free - free all memory for an atomic state
* @state: atomic state to deallocate
*
* This frees all memory associated with an atomic state, including all the
* per-object state for planes, crtcs and connectors.
*/
void drm_atomic_state_free(struct drm_atomic_state *state)
{
if (!state)
return;
drm_atomic_state_clear(state);
DRM_DEBUG_ATOMIC("Freeing atomic state %p\n", state);
kfree_state(state);
}
EXPORT_SYMBOL(drm_atomic_state_free);
/**
* drm_atomic_get_crtc_state - get crtc state
* @state: global atomic state object
* @crtc: crtc to get state object for
*
* This function returns the crtc state for the given crtc, allocating it if
* needed. It will also grab the relevant crtc lock to make sure that the state
* is consistent.
*
* Returns:
*
* Either the allocated state or the error code encoded into the pointer. When
* the error is EDEADLK then the w/w mutex code has detected a deadlock and the
* entire atomic sequence must be restarted. All other errors are fatal.
*/
struct drm_crtc_state *
drm_atomic_get_crtc_state(struct drm_atomic_state *state,
struct drm_crtc *crtc)
{
int ret, index;
struct drm_crtc_state *crtc_state;
index = drm_crtc_index(crtc);
if (state->crtc_states[index])
return state->crtc_states[index];
ret = drm_modeset_lock(&crtc->mutex, state->acquire_ctx);
if (ret)
return ERR_PTR(ret);
crtc_state = crtc->funcs->atomic_duplicate_state(crtc);
if (!crtc_state)
return ERR_PTR(-ENOMEM);
state->crtc_states[index] = crtc_state;
state->crtcs[index] = crtc;
crtc_state->state = state;
DRM_DEBUG_ATOMIC("Added [CRTC:%d] %p state to %p\n",
crtc->base.id, crtc_state, state);
return crtc_state;
}
EXPORT_SYMBOL(drm_atomic_get_crtc_state);
/**
* drm_atomic_crtc_set_property - set property on CRTC
* @crtc: the drm CRTC to set a property on
* @state: the state object to update with the new property value
* @property: the property to set
* @val: the new property value
*
* Use this instead of calling crtc->atomic_set_property directly.
* This function handles generic/core properties and calls out to
* driver's ->atomic_set_property() for driver properties. To ensure
* consistent behavior you must call this function rather than the
* driver hook directly.
*
* RETURNS:
* Zero on success, error code on failure
*/
int drm_atomic_crtc_set_property(struct drm_crtc *crtc,
struct drm_crtc_state *state, struct drm_property *property,
uint64_t val)
{
struct drm_device *dev = crtc->dev;
struct drm_mode_config *config = &dev->mode_config;
/* FIXME: Mode prop is missing, which also controls ->enable. */
if (property == config->prop_active)
state->active = val;
else if (crtc->funcs->atomic_set_property)
return crtc->funcs->atomic_set_property(crtc, state, property, val);
else
return -EINVAL;
return 0;
}
EXPORT_SYMBOL(drm_atomic_crtc_set_property);
/*
* This function handles generic/core properties and calls out to
* driver's ->atomic_get_property() for driver properties. To ensure
* consistent behavior you must call this function rather than the
* driver hook directly.
*/
int drm_atomic_crtc_get_property(struct drm_crtc *crtc,
const struct drm_crtc_state *state,
struct drm_property *property, uint64_t *val)
{
struct drm_device *dev = crtc->dev;
struct drm_mode_config *config = &dev->mode_config;
if (property == config->prop_active)
*val = state->active;
else if (crtc->funcs->atomic_get_property)
return crtc->funcs->atomic_get_property(crtc, state, property, val);
else
return -EINVAL;
return 0;
}
/**
* drm_atomic_crtc_check - check crtc state
* @crtc: crtc to check
* @state: crtc state to check
*
* Provides core sanity checks for crtc state.
*
* RETURNS:
* Zero on success, error code on failure
*/
static int drm_atomic_crtc_check(struct drm_crtc *crtc,
struct drm_crtc_state *state)
{
/* NOTE: we explicitly don't enforce constraints such as primary
* layer covering entire screen, since that is something we want
* to allow (on hw that supports it). For hw that does not, it
* should be checked in driver's crtc->atomic_check() vfunc.
*
* TODO: Add generic modeset state checks once we support those.
*/
if (state->active && !state->enable) {
DRM_DEBUG_ATOMIC("[CRTC:%d] active without enabled\n",
crtc->base.id);
return -EINVAL;
}
return 0;
}
/**
* drm_atomic_get_plane_state - get plane state
* @state: global atomic state object
* @plane: plane to get state object for
*
* This function returns the plane state for the given plane, allocating it if
* needed. It will also grab the relevant plane lock to make sure that the state
* is consistent.
*
* Returns:
*
* Either the allocated state or the error code encoded into the pointer. When
* the error is EDEADLK then the w/w mutex code has detected a deadlock and the
* entire atomic sequence must be restarted. All other errors are fatal.
*/
struct drm_plane_state *
drm_atomic_get_plane_state(struct drm_atomic_state *state,
struct drm_plane *plane)
{
int ret, index;
struct drm_plane_state *plane_state;
index = drm_plane_index(plane);
if (state->plane_states[index])
return state->plane_states[index];
ret = drm_modeset_lock(&plane->mutex, state->acquire_ctx);
if (ret)
return ERR_PTR(ret);
plane_state = plane->funcs->atomic_duplicate_state(plane);
if (!plane_state)
return ERR_PTR(-ENOMEM);
state->plane_states[index] = plane_state;
state->planes[index] = plane;
plane_state->state = state;
DRM_DEBUG_ATOMIC("Added [PLANE:%d] %p state to %p\n",
plane->base.id, plane_state, state);
if (plane_state->crtc) {
struct drm_crtc_state *crtc_state;
crtc_state = drm_atomic_get_crtc_state(state,
plane_state->crtc);
if (IS_ERR(crtc_state))
return ERR_CAST(crtc_state);
}
return plane_state;
}
EXPORT_SYMBOL(drm_atomic_get_plane_state);
/**
* drm_atomic_plane_set_property - set property on plane
* @plane: the drm plane to set a property on
* @state: the state object to update with the new property value
* @property: the property to set
* @val: the new property value
*
* Use this instead of calling plane->atomic_set_property directly.
* This function handles generic/core properties and calls out to
* driver's ->atomic_set_property() for driver properties. To ensure
* consistent behavior you must call this function rather than the
* driver hook directly.
*
* RETURNS:
* Zero on success, error code on failure
*/
int drm_atomic_plane_set_property(struct drm_plane *plane,
struct drm_plane_state *state, struct drm_property *property,
uint64_t val)
{
struct drm_device *dev = plane->dev;
struct drm_mode_config *config = &dev->mode_config;
if (property == config->prop_fb_id) {
struct drm_framebuffer *fb = drm_framebuffer_lookup(dev, val);
drm_atomic_set_fb_for_plane(state, fb);
if (fb)
drm_framebuffer_unreference(fb);
} else if (property == config->prop_crtc_id) {
struct drm_crtc *crtc = drm_crtc_find(dev, val);
return drm_atomic_set_crtc_for_plane(state, crtc);
} else if (property == config->prop_crtc_x) {
state->crtc_x = U642I64(val);
} else if (property == config->prop_crtc_y) {
state->crtc_y = U642I64(val);
} else if (property == config->prop_crtc_w) {
state->crtc_w = val;
} else if (property == config->prop_crtc_h) {
state->crtc_h = val;
} else if (property == config->prop_src_x) {
state->src_x = val;
} else if (property == config->prop_src_y) {
state->src_y = val;
} else if (property == config->prop_src_w) {
state->src_w = val;
} else if (property == config->prop_src_h) {
state->src_h = val;
} else if (property == config->rotation_property) {
state->rotation = val;
} else if (plane->funcs->atomic_set_property) {
return plane->funcs->atomic_set_property(plane, state,
property, val);
} else {
return -EINVAL;
}
return 0;
}
EXPORT_SYMBOL(drm_atomic_plane_set_property);
/*
* This function handles generic/core properties and calls out to
* driver's ->atomic_get_property() for driver properties. To ensure
* consistent behavior you must call this function rather than the
* driver hook directly.
*/
static int
drm_atomic_plane_get_property(struct drm_plane *plane,
const struct drm_plane_state *state,
struct drm_property *property, uint64_t *val)
{
struct drm_device *dev = plane->dev;
struct drm_mode_config *config = &dev->mode_config;
if (property == config->prop_fb_id) {
*val = (state->fb) ? state->fb->base.id : 0;
} else if (property == config->prop_crtc_id) {
*val = (state->crtc) ? state->crtc->base.id : 0;
} else if (property == config->prop_crtc_x) {
*val = I642U64(state->crtc_x);
} else if (property == config->prop_crtc_y) {
*val = I642U64(state->crtc_y);
} else if (property == config->prop_crtc_w) {
*val = state->crtc_w;
} else if (property == config->prop_crtc_h) {
*val = state->crtc_h;
} else if (property == config->prop_src_x) {
*val = state->src_x;
} else if (property == config->prop_src_y) {
*val = state->src_y;
} else if (property == config->prop_src_w) {
*val = state->src_w;
} else if (property == config->prop_src_h) {
*val = state->src_h;
} else if (property == config->rotation_property) {
*val = state->rotation;
} else if (plane->funcs->atomic_get_property) {
return plane->funcs->atomic_get_property(plane, state, property, val);
} else {
return -EINVAL;
}
return 0;
}
/**
* drm_atomic_plane_check - check plane state
* @plane: plane to check
* @state: plane state to check
*
* Provides core sanity checks for plane state.
*
* RETURNS:
* Zero on success, error code on failure
*/
static int drm_atomic_plane_check(struct drm_plane *plane,
struct drm_plane_state *state)
{
unsigned int fb_width, fb_height;
int ret;
/* either *both* CRTC and FB must be set, or neither */
if (WARN_ON(state->crtc && !state->fb)) {
DRM_DEBUG_ATOMIC("CRTC set but no FB\n");
return -EINVAL;
} else if (WARN_ON(state->fb && !state->crtc)) {
DRM_DEBUG_ATOMIC("FB set but no CRTC\n");
return -EINVAL;
}
/* if disabled, we don't care about the rest of the state: */
if (!state->crtc)
return 0;
/* Check whether this plane is usable on this CRTC */
if (!(plane->possible_crtcs & drm_crtc_mask(state->crtc))) {
DRM_DEBUG_ATOMIC("Invalid crtc for plane\n");
return -EINVAL;
}
/* Check whether this plane supports the fb pixel format. */
ret = drm_plane_check_pixel_format(plane, state->fb->pixel_format);
if (ret) {
DRM_DEBUG_ATOMIC("Invalid pixel format %s\n",
drm_get_format_name(state->fb->pixel_format));
return ret;
}
/* Give drivers some help against integer overflows */
if (state->crtc_w > INT_MAX ||
state->crtc_x > INT_MAX - (int32_t) state->crtc_w ||
state->crtc_h > INT_MAX ||
state->crtc_y > INT_MAX - (int32_t) state->crtc_h) {
DRM_DEBUG_ATOMIC("Invalid CRTC coordinates %ux%u+%d+%d\n",
state->crtc_w, state->crtc_h,
state->crtc_x, state->crtc_y);
return -ERANGE;
}
fb_width = state->fb->width << 16;
fb_height = state->fb->height << 16;
/* Make sure source coordinates are inside the fb. */
if (state->src_w > fb_width ||
state->src_x > fb_width - state->src_w ||
state->src_h > fb_height ||
state->src_y > fb_height - state->src_h) {
DRM_DEBUG_ATOMIC("Invalid source coordinates "
"%u.%06ux%u.%06u+%u.%06u+%u.%06u\n",
state->src_w >> 16, ((state->src_w & 0xffff) * 15625) >> 10,
state->src_h >> 16, ((state->src_h & 0xffff) * 15625) >> 10,
state->src_x >> 16, ((state->src_x & 0xffff) * 15625) >> 10,
state->src_y >> 16, ((state->src_y & 0xffff) * 15625) >> 10);
return -ENOSPC;
}
return 0;
}
/**
* drm_atomic_get_connector_state - get connector state
* @state: global atomic state object
* @connector: connector to get state object for
*
* This function returns the connector state for the given connector,
* allocating it if needed. It will also grab the relevant connector lock to
* make sure that the state is consistent.
*
* Returns:
*
* Either the allocated state or the error code encoded into the pointer. When
* the error is EDEADLK then the w/w mutex code has detected a deadlock and the
* entire atomic sequence must be restarted. All other errors are fatal.
*/
struct drm_connector_state *
drm_atomic_get_connector_state(struct drm_atomic_state *state,
struct drm_connector *connector)
{
int ret, index;
struct drm_mode_config *config = &connector->dev->mode_config;
struct drm_connector_state *connector_state;
ret = drm_modeset_lock(&config->connection_mutex, state->acquire_ctx);
if (ret)
return ERR_PTR(ret);
index = drm_connector_index(connector);
/*
* Construction of atomic state updates can race with a connector
* hot-add which might overflow. In this case flip the table and just
* restart the entire ioctl - no one is fast enough to livelock a cpu
* with physical hotplug events anyway.
*
* Note that we only grab the indexes once we have the right lock to
* prevent hotplug/unplugging of connectors. So removal is no problem,
* at most the array is a bit too large.
*/
if (index >= state->num_connector) {
DRM_DEBUG_ATOMIC("Hot-added connector would overflow state array, restarting\n");
return ERR_PTR(-EAGAIN);
}
if (state->connector_states[index])
return state->connector_states[index];
connector_state = connector->funcs->atomic_duplicate_state(connector);
if (!connector_state)
return ERR_PTR(-ENOMEM);
state->connector_states[index] = connector_state;
state->connectors[index] = connector;
connector_state->state = state;
DRM_DEBUG_ATOMIC("Added [CONNECTOR:%d] %p state to %p\n",
connector->base.id, connector_state, state);
if (connector_state->crtc) {
struct drm_crtc_state *crtc_state;
crtc_state = drm_atomic_get_crtc_state(state,
connector_state->crtc);
if (IS_ERR(crtc_state))
return ERR_CAST(crtc_state);
}
return connector_state;
}
EXPORT_SYMBOL(drm_atomic_get_connector_state);
/**
* drm_atomic_connector_set_property - set property on connector.
* @connector: the drm connector to set a property on
* @state: the state object to update with the new property value
* @property: the property to set
* @val: the new property value
*
* Use this instead of calling connector->atomic_set_property directly.
* This function handles generic/core properties and calls out to
* driver's ->atomic_set_property() for driver properties. To ensure
* consistent behavior you must call this function rather than the
* driver hook directly.
*
* RETURNS:
* Zero on success, error code on failure
*/
int drm_atomic_connector_set_property(struct drm_connector *connector,
struct drm_connector_state *state, struct drm_property *property,
uint64_t val)
{
struct drm_device *dev = connector->dev;
struct drm_mode_config *config = &dev->mode_config;
if (property == config->prop_crtc_id) {
struct drm_crtc *crtc = drm_crtc_find(dev, val);
return drm_atomic_set_crtc_for_connector(state, crtc);
} else if (property == config->dpms_property) {
/* setting DPMS property requires special handling, which
* is done in legacy setprop path for us. Disallow (for
* now?) atomic writes to DPMS property:
*/
return -EINVAL;
} else if (connector->funcs->atomic_set_property) {
return connector->funcs->atomic_set_property(connector,
state, property, val);
} else {
return -EINVAL;
}
}
EXPORT_SYMBOL(drm_atomic_connector_set_property);
/*
* This function handles generic/core properties and calls out to
* driver's ->atomic_get_property() for driver properties. To ensure
* consistent behavior you must call this function rather than the
* driver hook directly.
*/
static int
drm_atomic_connector_get_property(struct drm_connector *connector,
const struct drm_connector_state *state,
struct drm_property *property, uint64_t *val)
{
struct drm_device *dev = connector->dev;
struct drm_mode_config *config = &dev->mode_config;
if (property == config->prop_crtc_id) {
*val = (state->crtc) ? state->crtc->base.id : 0;
} else if (property == config->dpms_property) {
*val = connector->dpms;
} else if (connector->funcs->atomic_get_property) {
return connector->funcs->atomic_get_property(connector,
state, property, val);
} else {
return -EINVAL;
}
return 0;
}
int drm_atomic_get_property(struct drm_mode_object *obj,
struct drm_property *property, uint64_t *val)
{
struct drm_device *dev = property->dev;
int ret;
switch (obj->type) {
case DRM_MODE_OBJECT_CONNECTOR: {
struct drm_connector *connector = obj_to_connector(obj);
WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
ret = drm_atomic_connector_get_property(connector,
connector->state, property, val);
break;
}
case DRM_MODE_OBJECT_CRTC: {
struct drm_crtc *crtc = obj_to_crtc(obj);
WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
ret = drm_atomic_crtc_get_property(crtc,
crtc->state, property, val);
break;
}
case DRM_MODE_OBJECT_PLANE: {
struct drm_plane *plane = obj_to_plane(obj);
WARN_ON(!drm_modeset_is_locked(&plane->mutex));
ret = drm_atomic_plane_get_property(plane,
plane->state, property, val);
break;
}
default:
ret = -EINVAL;
break;
}
return ret;
}
/**
* drm_atomic_set_crtc_for_plane - set crtc for plane
* @plane_state: the plane whose incoming state to update
* @crtc: crtc to use for the plane
*
* Changing the assigned crtc for a plane requires us to grab the lock and state
* for the new crtc, as needed. This function takes care of all these details
* besides updating the pointer in the state object itself.
*
* Returns:
* 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
* then the w/w mutex code has detected a deadlock and the entire atomic
* sequence must be restarted. All other errors are fatal.
*/
int
drm_atomic_set_crtc_for_plane(struct drm_plane_state *plane_state,
struct drm_crtc *crtc)
{
struct drm_plane *plane = plane_state->plane;
struct drm_crtc_state *crtc_state;
if (plane_state->crtc) {
crtc_state = drm_atomic_get_crtc_state(plane_state->state,
plane_state->crtc);
if (WARN_ON(IS_ERR(crtc_state)))
return PTR_ERR(crtc_state);
crtc_state->plane_mask &= ~(1 << drm_plane_index(plane));
}
plane_state->crtc = crtc;
if (crtc) {
crtc_state = drm_atomic_get_crtc_state(plane_state->state,
crtc);
if (IS_ERR(crtc_state))
return PTR_ERR(crtc_state);
crtc_state->plane_mask |= (1 << drm_plane_index(plane));
}
if (crtc)
DRM_DEBUG_ATOMIC("Link plane state %p to [CRTC:%d]\n",
plane_state, crtc->base.id);
else
DRM_DEBUG_ATOMIC("Link plane state %p to [NOCRTC]\n",
plane_state);
return 0;
}
EXPORT_SYMBOL(drm_atomic_set_crtc_for_plane);
/**
* drm_atomic_set_fb_for_plane - set framebuffer for plane
* @plane_state: atomic state object for the plane
* @fb: fb to use for the plane
*
* Changing the assigned framebuffer for a plane requires us to grab a reference
* to the new fb and drop the reference to the old fb, if there is one. This
* function takes care of all these details besides updating the pointer in the
* state object itself.
*/
void
drm_atomic_set_fb_for_plane(struct drm_plane_state *plane_state,
struct drm_framebuffer *fb)
{
if (plane_state->fb)
drm_framebuffer_unreference(plane_state->fb);
if (fb)
drm_framebuffer_reference(fb);
plane_state->fb = fb;
if (fb)
DRM_DEBUG_ATOMIC("Set [FB:%d] for plane state %p\n",
fb->base.id, plane_state);
else
DRM_DEBUG_ATOMIC("Set [NOFB] for plane state %p\n",
plane_state);
}
EXPORT_SYMBOL(drm_atomic_set_fb_for_plane);
/**
* drm_atomic_set_crtc_for_connector - set crtc for connector
* @conn_state: atomic state object for the connector
* @crtc: crtc to use for the connector
*
* Changing the assigned crtc for a connector requires us to grab the lock and
* state for the new crtc, as needed. This function takes care of all these
* details besides updating the pointer in the state object itself.
*
* Returns:
* 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
* then the w/w mutex code has detected a deadlock and the entire atomic
* sequence must be restarted. All other errors are fatal.
*/
int
drm_atomic_set_crtc_for_connector(struct drm_connector_state *conn_state,
struct drm_crtc *crtc)
{
struct drm_crtc_state *crtc_state;
if (crtc) {
crtc_state = drm_atomic_get_crtc_state(conn_state->state, crtc);
if (IS_ERR(crtc_state))
return PTR_ERR(crtc_state);
}
conn_state->crtc = crtc;
if (crtc)
DRM_DEBUG_ATOMIC("Link connector state %p to [CRTC:%d]\n",
conn_state, crtc->base.id);
else
DRM_DEBUG_ATOMIC("Link connector state %p to [NOCRTC]\n",
conn_state);
return 0;
}
EXPORT_SYMBOL(drm_atomic_set_crtc_for_connector);
/**
* drm_atomic_add_affected_connectors - add connectors for crtc
* @state: atomic state
* @crtc: DRM crtc
*
* This function walks the current configuration and adds all connectors
* currently using @crtc to the atomic configuration @state. Note that this
* function must acquire the connection mutex. This can potentially cause
* unneeded seralization if the update is just for the planes on one crtc. Hence
* drivers and helpers should only call this when really needed (e.g. when a
* full modeset needs to happen due to some change).
*
* Returns:
* 0 on success or can fail with -EDEADLK or -ENOMEM. When the error is EDEADLK
* then the w/w mutex code has detected a deadlock and the entire atomic
* sequence must be restarted. All other errors are fatal.
*/
int
drm_atomic_add_affected_connectors(struct drm_atomic_state *state,
struct drm_crtc *crtc)
{
struct drm_mode_config *config = &state->dev->mode_config;
struct drm_connector *connector;
struct drm_connector_state *conn_state;
int ret;
ret = drm_modeset_lock(&config->connection_mutex, state->acquire_ctx);
if (ret)
return ret;
DRM_DEBUG_ATOMIC("Adding all current connectors for [CRTC:%d] to %p\n",
crtc->base.id, state);
/*
* Changed connectors are already in @state, so only need to look at the
* current configuration.
*/
list_for_each_entry(connector, &config->connector_list, head) {
if (connector->state->crtc != crtc)
continue;
conn_state = drm_atomic_get_connector_state(state, connector);
if (IS_ERR(conn_state))
return PTR_ERR(conn_state);
}
return 0;
}
EXPORT_SYMBOL(drm_atomic_add_affected_connectors);
/**
* drm_atomic_connectors_for_crtc - count number of connected outputs
* @state: atomic state
* @crtc: DRM crtc
*
* This function counts all connectors which will be connected to @crtc
* according to @state. Useful to recompute the enable state for @crtc.
*/
int
drm_atomic_connectors_for_crtc(struct drm_atomic_state *state,
struct drm_crtc *crtc)
{
struct drm_connector *connector;
struct drm_connector_state *conn_state;
int i, num_connected_connectors = 0;
for_each_connector_in_state(state, connector, conn_state, i) {
if (conn_state->crtc == crtc)
num_connected_connectors++;
}
DRM_DEBUG_ATOMIC("State %p has %i connectors for [CRTC:%d]\n",
state, num_connected_connectors, crtc->base.id);
return num_connected_connectors;
}
EXPORT_SYMBOL(drm_atomic_connectors_for_crtc);
/**
* drm_atomic_legacy_backoff - locking backoff for legacy ioctls
* @state: atomic state
*
* This function should be used by legacy entry points which don't understand
* -EDEADLK semantics. For simplicity this one will grab all modeset locks after
* the slowpath completed.
*/
void drm_atomic_legacy_backoff(struct drm_atomic_state *state)
{
int ret;
retry:
drm_modeset_backoff(state->acquire_ctx);
ret = drm_modeset_lock(&state->dev->mode_config.connection_mutex,
state->acquire_ctx);
if (ret)
goto retry;
ret = drm_modeset_lock_all_crtcs(state->dev,
state->acquire_ctx);
if (ret)
goto retry;
}
EXPORT_SYMBOL(drm_atomic_legacy_backoff);
/**
* drm_atomic_check_only - check whether a given config would work
* @state: atomic configuration to check
*
* Note that this function can return -EDEADLK if the driver needed to acquire
* more locks but encountered a deadlock. The caller must then do the usual w/w
* backoff dance and restart. All other errors are fatal.
*
* Returns:
* 0 on success, negative error code on failure.
*/
int drm_atomic_check_only(struct drm_atomic_state *state)
{
struct drm_device *dev = state->dev;
struct drm_mode_config *config = &dev->mode_config;
struct drm_plane *plane;
struct drm_plane_state *plane_state;
struct drm_crtc *crtc;
struct drm_crtc_state *crtc_state;
int i, ret = 0;
DRM_DEBUG_ATOMIC("checking %p\n", state);
for_each_plane_in_state(state, plane, plane_state, i) {
ret = drm_atomic_plane_check(plane, plane_state);
if (ret) {
DRM_DEBUG_ATOMIC("[PLANE:%d] atomic core check failed\n",
plane->base.id);
return ret;
}
}
for_each_crtc_in_state(state, crtc, crtc_state, i) {
ret = drm_atomic_crtc_check(crtc, crtc_state);
if (ret) {
DRM_DEBUG_ATOMIC("[CRTC:%d] atomic core check failed\n",
crtc->base.id);
return ret;
}
}
if (config->funcs->atomic_check)
ret = config->funcs->atomic_check(state->dev, state);
if (!state->allow_modeset) {
for_each_crtc_in_state(state, crtc, crtc_state, i) {
if (crtc_state->mode_changed ||
crtc_state->active_changed) {
DRM_DEBUG_ATOMIC("[CRTC:%d] requires full modeset\n",
crtc->base.id);
return -EINVAL;
}
}
}
return ret;
}
EXPORT_SYMBOL(drm_atomic_check_only);
/**
* drm_atomic_commit - commit configuration atomically
* @state: atomic configuration to check
*
* Note that this function can return -EDEADLK if the driver needed to acquire
* more locks but encountered a deadlock. The caller must then do the usual w/w
* backoff dance and restart. All other errors are fatal.
*
* Also note that on successful execution ownership of @state is transferred
* from the caller of this function to the function itself. The caller must not
* free or in any other way access @state. If the function fails then the caller
* must clean up @state itself.
*
* Returns:
* 0 on success, negative error code on failure.
*/
int drm_atomic_commit(struct drm_atomic_state *state)
{
struct drm_mode_config *config = &state->dev->mode_config;
int ret;
ret = drm_atomic_check_only(state);
if (ret)
return ret;
DRM_DEBUG_ATOMIC("commiting %p\n", state);
return config->funcs->atomic_commit(state->dev, state, false);
}
EXPORT_SYMBOL(drm_atomic_commit);
/**
* drm_atomic_async_commit - atomic&async configuration commit
* @state: atomic configuration to check
*
* Note that this function can return -EDEADLK if the driver needed to acquire
* more locks but encountered a deadlock. The caller must then do the usual w/w
* backoff dance and restart. All other errors are fatal.
*
* Also note that on successful execution ownership of @state is transferred
* from the caller of this function to the function itself. The caller must not
* free or in any other way access @state. If the function fails then the caller
* must clean up @state itself.
*
* Returns:
* 0 on success, negative error code on failure.
*/
int drm_atomic_async_commit(struct drm_atomic_state *state)
{
struct drm_mode_config *config = &state->dev->mode_config;
int ret;
ret = drm_atomic_check_only(state);
if (ret)
return ret;
DRM_DEBUG_ATOMIC("commiting %p asynchronously\n", state);
return config->funcs->atomic_commit(state->dev, state, true);
}
EXPORT_SYMBOL(drm_atomic_async_commit);
/*
* The big monstor ioctl
*/
static struct drm_pending_vblank_event *create_vblank_event(
struct drm_device *dev, struct drm_file *file_priv, uint64_t user_data)
{
struct drm_pending_vblank_event *e = NULL;
unsigned long flags;
spin_lock_irqsave(&dev->event_lock, flags);
if (file_priv->event_space < sizeof e->event) {
spin_unlock_irqrestore(&dev->event_lock, flags);
goto out;
}
file_priv->event_space -= sizeof e->event;
spin_unlock_irqrestore(&dev->event_lock, flags);
e = kzalloc(sizeof *e, GFP_KERNEL);
if (e == NULL) {
spin_lock_irqsave(&dev->event_lock, flags);
file_priv->event_space += sizeof e->event;
spin_unlock_irqrestore(&dev->event_lock, flags);
goto out;
}
e->event.base.type = DRM_EVENT_FLIP_COMPLETE;
e->event.base.length = sizeof e->event;
e->event.user_data = user_data;
e->base.event = &e->event.base;
e->base.file_priv = file_priv;
e->base.destroy = (void (*) (struct drm_pending_event *)) kfree;
out:
return e;
}
static void destroy_vblank_event(struct drm_device *dev,
struct drm_file *file_priv, struct drm_pending_vblank_event *e)
{
unsigned long flags;
spin_lock_irqsave(&dev->event_lock, flags);
file_priv->event_space += sizeof e->event;
spin_unlock_irqrestore(&dev->event_lock, flags);
kfree(e);
}
static int atomic_set_prop(struct drm_atomic_state *state,
struct drm_mode_object *obj, struct drm_property *prop,
uint64_t prop_value)
{
struct drm_mode_object *ref;
int ret;
if (!drm_property_change_valid_get(prop, prop_value, &ref))
return -EINVAL;
switch (obj->type) {
case DRM_MODE_OBJECT_CONNECTOR: {
struct drm_connector *connector = obj_to_connector(obj);
struct drm_connector_state *connector_state;
connector_state = drm_atomic_get_connector_state(state, connector);
if (IS_ERR(connector_state)) {
ret = PTR_ERR(connector_state);
break;
}
ret = drm_atomic_connector_set_property(connector,
connector_state, prop, prop_value);
break;
}
case DRM_MODE_OBJECT_CRTC: {
struct drm_crtc *crtc = obj_to_crtc(obj);
struct drm_crtc_state *crtc_state;
crtc_state = drm_atomic_get_crtc_state(state, crtc);
if (IS_ERR(crtc_state)) {
ret = PTR_ERR(crtc_state);
break;
}
ret = drm_atomic_crtc_set_property(crtc,
crtc_state, prop, prop_value);
break;
}
case DRM_MODE_OBJECT_PLANE: {
struct drm_plane *plane = obj_to_plane(obj);
struct drm_plane_state *plane_state;
plane_state = drm_atomic_get_plane_state(state, plane);
if (IS_ERR(plane_state)) {
ret = PTR_ERR(plane_state);
break;
}
ret = drm_atomic_plane_set_property(plane,
plane_state, prop, prop_value);
break;
}
default:
ret = -EINVAL;
break;
}
drm_property_change_valid_put(prop, ref);
return ret;
}
int drm_mode_atomic_ioctl(struct drm_device *dev,
void *data, struct drm_file *file_priv)
{
struct drm_mode_atomic *arg = data;
uint32_t __user *objs_ptr = (uint32_t __user *)(unsigned long)(arg->objs_ptr);
uint32_t __user *count_props_ptr = (uint32_t __user *)(unsigned long)(arg->count_props_ptr);
uint32_t __user *props_ptr = (uint32_t __user *)(unsigned long)(arg->props_ptr);
uint64_t __user *prop_values_ptr = (uint64_t __user *)(unsigned long)(arg->prop_values_ptr);
unsigned int copied_objs, copied_props;
struct drm_atomic_state *state;
struct drm_modeset_acquire_ctx ctx;
struct drm_plane *plane;
struct drm_crtc *crtc;
struct drm_crtc_state *crtc_state;
unsigned plane_mask = 0;
int ret = 0;
unsigned int i, j;
/* disallow for drivers not supporting atomic: */
if (!drm_core_check_feature(dev, DRIVER_ATOMIC))
return -EINVAL;
/* disallow for userspace that has not enabled atomic cap (even
* though this may be a bit overkill, since legacy userspace
* wouldn't know how to call this ioctl)
*/
if (!file_priv->atomic)
return -EINVAL;
if (arg->flags & ~DRM_MODE_ATOMIC_FLAGS)
return -EINVAL;
if (arg->reserved)
return -EINVAL;
if ((arg->flags & DRM_MODE_PAGE_FLIP_ASYNC) &&
!dev->mode_config.async_page_flip)
return -EINVAL;
/* can't test and expect an event at the same time. */
if ((arg->flags & DRM_MODE_ATOMIC_TEST_ONLY) &&
(arg->flags & DRM_MODE_PAGE_FLIP_EVENT))
return -EINVAL;
drm_modeset_acquire_init(&ctx, 0);
state = drm_atomic_state_alloc(dev);
if (!state)
return -ENOMEM;
state->acquire_ctx = &ctx;
state->allow_modeset = !!(arg->flags & DRM_MODE_ATOMIC_ALLOW_MODESET);
retry:
copied_objs = 0;
copied_props = 0;
for (i = 0; i < arg->count_objs; i++) {
uint32_t obj_id, count_props;
struct drm_mode_object *obj;
if (get_user(obj_id, objs_ptr + copied_objs)) {
ret = -EFAULT;
goto fail;
}
obj = drm_mode_object_find(dev, obj_id, DRM_MODE_OBJECT_ANY);
if (!obj || !obj->properties) {
ret = -ENOENT;
goto fail;
}
if (obj->type == DRM_MODE_OBJECT_PLANE) {
plane = obj_to_plane(obj);
plane_mask |= (1 << drm_plane_index(plane));
plane->old_fb = plane->fb;
}
if (get_user(count_props, count_props_ptr + copied_objs)) {
ret = -EFAULT;
goto fail;
}
copied_objs++;
for (j = 0; j < count_props; j++) {
uint32_t prop_id;
uint64_t prop_value;
struct drm_property *prop;
if (get_user(prop_id, props_ptr + copied_props)) {
ret = -EFAULT;
goto fail;
}
prop = drm_property_find(dev, prop_id);
if (!prop) {
ret = -ENOENT;
goto fail;
}
if (copy_from_user(&prop_value,
prop_values_ptr + copied_props,
sizeof(prop_value))) {
ret = -EFAULT;
goto fail;
}
ret = atomic_set_prop(state, obj, prop, prop_value);
if (ret)
goto fail;
copied_props++;
}
}
if (arg->flags & DRM_MODE_PAGE_FLIP_EVENT) {
for_each_crtc_in_state(state, crtc, crtc_state, i) {
struct drm_pending_vblank_event *e;
e = create_vblank_event(dev, file_priv, arg->user_data);
if (!e) {
ret = -ENOMEM;
goto fail;
}
crtc_state->event = e;
}
}
if (arg->flags & DRM_MODE_ATOMIC_TEST_ONLY) {
ret = drm_atomic_check_only(state);
/* _check_only() does not free state, unlike _commit() */
drm_atomic_state_free(state);
} else if (arg->flags & DRM_MODE_ATOMIC_NONBLOCK) {
ret = drm_atomic_async_commit(state);
} else {
ret = drm_atomic_commit(state);
}
/* if succeeded, fixup legacy plane crtc/fb ptrs before dropping
* locks (ie. while it is still safe to deref plane->state). We
* need to do this here because the driver entry points cannot
* distinguish between legacy and atomic ioctls.
*/
drm_for_each_plane_mask(plane, dev, plane_mask) {
if (ret == 0) {
struct drm_framebuffer *new_fb = plane->state->fb;
if (new_fb)
drm_framebuffer_reference(new_fb);
plane->fb = new_fb;
plane->crtc = plane->state->crtc;
} else {
plane->old_fb = NULL;
}
if (plane->old_fb) {
drm_framebuffer_unreference(plane->old_fb);
plane->old_fb = NULL;
}
}
drm_modeset_drop_locks(&ctx);
drm_modeset_acquire_fini(&ctx);
return ret;
fail:
if (ret == -EDEADLK)
goto backoff;
if (arg->flags & DRM_MODE_PAGE_FLIP_EVENT) {
for_each_crtc_in_state(state, crtc, crtc_state, i) {
destroy_vblank_event(dev, file_priv, crtc_state->event);
crtc_state->event = NULL;
}
}
drm_atomic_state_free(state);
drm_modeset_drop_locks(&ctx);
drm_modeset_acquire_fini(&ctx);
return ret;
backoff:
drm_atomic_state_clear(state);
drm_modeset_backoff(&ctx);
goto retry;
}
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