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drm/atomic: Allow drivers to subclass drm_atomic_state, v3

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Drivers may need to store the state of shared resources, such as PLLs
or FIFO space, into the atomic state. Allow this by making it possible
to subclass drm_atomic_state.

Changes since v1:
- Change member names for functions to atomic_state_(alloc,clear)
- Change __drm_atomic_state_new to drm_atomic_state_init
- Allow free function to be overridden too, in case extra memory is
  allocated in alloc.
Changes since v2:
- Rename *_default_free to default_release, to make clear it doesn't
  free the state object itself.

Cc: dri-devel@lists.freedesktop.org
Acked-by: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Maarten Lankhorst 2015-05-18 10:06:40 +02:00 committed by Daniel Vetter
parent 744b058827
commit 036ef5733b
3 changed files with 99 additions and 28 deletions
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116
drivers/gpu/drm/drm_atomic.c
View File

@ -30,7 +30,15 @@
#include <drm/drm_atomic.h>
#include <drm/drm_plane_helper.h>
static void kfree_state(struct drm_atomic_state *state)
/**
* drm_atomic_state_default_release -
* release memory initialized by drm_atomic_state_init
* @state: atomic state
*
* Free all the memory allocated by drm_atomic_state_init.
* This is useful for drivers that subclass the atomic state.
*/
void drm_atomic_state_default_release(struct drm_atomic_state *state)
{
kfree(state->connectors);
kfree(state->connector_states);
@ -38,24 +46,20 @@ static void kfree_state(struct drm_atomic_state *state)
kfree(state->crtc_states);
kfree(state->planes);
kfree(state->plane_states);
kfree(state);
}
EXPORT_SYMBOL(drm_atomic_state_default_release);
/**
* drm_atomic_state_alloc - allocate atomic state
* drm_atomic_state_init - init new atomic state
* @dev: DRM device
* @state: atomic state
*
* This allocates an empty atomic state to track updates.
* Default implementation for filling in a new atomic state.
* This is useful for drivers that subclass the atomic state.
*/
struct drm_atomic_state *
drm_atomic_state_alloc(struct drm_device *dev)
int
drm_atomic_state_init(struct drm_device *dev, struct drm_atomic_state *state)
{
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?
*/
@ -92,31 +96,50 @@ drm_atomic_state_alloc(struct drm_device *dev)
state->dev = dev;
DRM_DEBUG_ATOMIC("Allocate atomic state %p\n", state);
DRM_DEBUG_ATOMIC("Allocated atomic state %p\n", state);
return state;
return 0;
fail:
kfree_state(state);
drm_atomic_state_default_release(state);
return -ENOMEM;
}
EXPORT_SYMBOL(drm_atomic_state_init);
return NULL;
/**
* 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_mode_config *config = &dev->mode_config;
struct drm_atomic_state *state;
if (!config->funcs->atomic_state_alloc) {
state = kzalloc(sizeof(*state), GFP_KERNEL);
if (!state)
return NULL;
if (drm_atomic_state_init(dev, state) < 0) {
kfree(state);
return NULL;
}
return state;
}
return config->funcs->atomic_state_alloc(dev);
}
EXPORT_SYMBOL(drm_atomic_state_alloc);
/**
* drm_atomic_state_clear - clear state object
* drm_atomic_state_default_clear - clear base atomic state
* @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.
* Default implementation for clearing atomic state.
* This is useful for drivers that subclass the atomic state.
*/
void drm_atomic_state_clear(struct drm_atomic_state *state)
void drm_atomic_state_default_clear(struct drm_atomic_state *state)
{
struct drm_device *dev = state->dev;
struct drm_mode_config *config = &dev->mode_config;
@ -162,6 +185,32 @@ void drm_atomic_state_clear(struct drm_atomic_state *state)
state->plane_states[i] = NULL;
}
}
EXPORT_SYMBOL(drm_atomic_state_default_clear);
/**
* 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;
if (config->funcs->atomic_state_clear)
config->funcs->atomic_state_clear(state);
else
drm_atomic_state_default_clear(state);
}
EXPORT_SYMBOL(drm_atomic_state_clear);
/**
@ -173,14 +222,25 @@ EXPORT_SYMBOL(drm_atomic_state_clear);
*/
void drm_atomic_state_free(struct drm_atomic_state *state)
{
struct drm_device *dev;
struct drm_mode_config *config;
if (!state)
return;
dev = state->dev;
config = &dev->mode_config;
drm_atomic_state_clear(state);
DRM_DEBUG_ATOMIC("Freeing atomic state %p\n", state);
kfree_state(state);
if (config->funcs->atomic_state_free) {
config->funcs->atomic_state_free(state);
} else {
drm_atomic_state_default_release(state);
kfree(state);
}
}
EXPORT_SYMBOL(drm_atomic_state_free);

5
include/drm/drm_atomic.h
View File

@ -35,6 +35,11 @@ drm_atomic_state_alloc(struct drm_device *dev);
void drm_atomic_state_clear(struct drm_atomic_state *state);
void drm_atomic_state_free(struct drm_atomic_state *state);
int __must_check
drm_atomic_state_init(struct drm_device *dev, struct drm_atomic_state *state);
void drm_atomic_state_default_clear(struct drm_atomic_state *state);
void drm_atomic_state_default_release(struct drm_atomic_state *state);
struct drm_crtc_state * __must_check
drm_atomic_get_crtc_state(struct drm_atomic_state *state,
struct drm_crtc *crtc);

6
include/drm/drm_crtc.h
View File

@ -979,6 +979,9 @@ struct drm_mode_set {
* @atomic_check: check whether a given atomic state update is possible
* @atomic_commit: commit an atomic state update previously verified with
* atomic_check()
* @atomic_state_alloc: allocate a new atomic state
* @atomic_state_clear: clear the atomic state
* @atomic_state_free: free the atomic state
*
* Some global (i.e. not per-CRTC, connector, etc) mode setting functions that
* involve drivers.
@ -994,6 +997,9 @@ struct drm_mode_config_funcs {
int (*atomic_commit)(struct drm_device *dev,
struct drm_atomic_state *a,
bool async);
struct drm_atomic_state *(*atomic_state_alloc)(struct drm_device *dev);
void (*atomic_state_clear)(struct drm_atomic_state *state);
void (*atomic_state_free)(struct drm_atomic_state *state);
};
/**