0,0 → 1,715 |
/* |
* 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; |
|
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_KMS("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_KMS("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]); |
} |
|
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]); |
} |
|
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]); |
} |
} |
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) |
{ |
drm_atomic_state_clear(state); |
|
DRM_DEBUG_KMS("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_KMS("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_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_KMS("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_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_KMS("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_KMS("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_set_crtc_for_plane - set crtc for plane |
* @state: the incoming atomic state |
* @plane: 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_atomic_state *state, |
struct drm_plane *plane, struct drm_crtc *crtc) |
{ |
struct drm_plane_state *plane_state = |
drm_atomic_get_plane_state(state, plane); |
struct drm_crtc_state *crtc_state; |
|
if (WARN_ON(IS_ERR(plane_state))) |
return PTR_ERR(plane_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_KMS("Link plane state %p to [CRTC:%d]\n", |
plane_state, crtc->base.id); |
else |
DRM_DEBUG_KMS("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 crtc 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_KMS("Set [FB:%d] for plane state %p\n", |
fb->base.id, plane_state); |
else |
DRM_DEBUG_KMS("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_KMS("Link connector state %p to [CRTC:%d]\n", |
conn_state, crtc->base.id); |
else |
DRM_DEBUG_KMS("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_KMS("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) |
{ |
int i, num_connected_connectors = 0; |
|
for (i = 0; i < state->num_connector; i++) { |
struct drm_connector_state *conn_state; |
|
conn_state = state->connector_states[i]; |
|
if (conn_state && conn_state->crtc == crtc) |
num_connected_connectors++; |
} |
|
DRM_DEBUG_KMS("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_mode_config *config = &state->dev->mode_config; |
|
DRM_DEBUG_KMS("checking %p\n", state); |
|
if (config->funcs->atomic_check) |
return config->funcs->atomic_check(state->dev, state); |
else |
return 0; |
} |
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_KMS("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_KMS("commiting %p asynchronously\n", state); |
|
return config->funcs->atomic_commit(state->dev, state, true); |
} |
EXPORT_SYMBOL(drm_atomic_async_commit); |
|
/** |
* drm_atomic_helper_plane_duplicate_state - default state duplicate hook |
* @plane: drm plane |
* |
* Default plane state duplicate hook for drivers which don't have their own |
* subclassed plane state structure. |
*/ |
struct drm_plane_state * |
drm_atomic_helper_plane_duplicate_state(struct drm_plane *plane) |
{ |
struct drm_plane_state *state; |
|
if (WARN_ON(!plane->state)) |
return NULL; |
|
state = kmemdup(plane->state, sizeof(*plane->state), GFP_KERNEL); |
|
if (state && state->fb) |
drm_framebuffer_reference(state->fb); |
|
return state; |
} |
EXPORT_SYMBOL(drm_atomic_helper_plane_duplicate_state); |
|
|
/** |
* drm_atomic_helper_crtc_destroy_state - default state destroy hook |
* @crtc: drm CRTC |
* @state: CRTC state object to release |
* |
* Default CRTC state destroy hook for drivers which don't have their own |
* subclassed CRTC state structure. |
*/ |
void drm_atomic_helper_crtc_destroy_state(struct drm_crtc *crtc, |
struct drm_crtc_state *state) |
{ |
kfree(state); |
} |
EXPORT_SYMBOL(drm_atomic_helper_crtc_destroy_state); |
|
/** |
* drm_atomic_helper_plane_destroy_state - default state destroy hook |
* @plane: drm plane |
* @state: plane state object to release |
* |
* Default plane state destroy hook for drivers which don't have their own |
* subclassed plane state structure. |
*/ |
void drm_atomic_helper_plane_destroy_state(struct drm_plane *plane, |
struct drm_plane_state *state) |
{ |
if (state->fb) |
drm_framebuffer_unreference(state->fb); |
|
kfree(state); |
} |
EXPORT_SYMBOL(drm_atomic_helper_plane_destroy_state); |