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drm/mode: move framebuffer reference into object.

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This is the initial code to add references to some mode objects.
In the future we need to start reference counting connectors so
firstly I want to reorganise the code so the framebuffer ref counting
uses the same paths.

This patch shouldn't change any functionality, just moves the kref.

[airlied: move kerneldoc as well]
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Dave Airlie
2016-04-15 15:10:36 +10:00
parent 747a598ffa
commit d0f37cf629
2 changed files with 66 additions and 38 deletions
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32
include/drm/drm_crtc.h
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@@ -49,6 +49,8 @@ struct drm_mode_object {
uint32_t id;
uint32_t type;
struct drm_object_properties *properties;
struct kref refcount;
void (*free_cb)(struct kref *kref);
};
#define DRM_OBJECT_MAX_PROPERTY 24
@@ -223,8 +225,8 @@ struct drm_framebuffer {
* should be deferred. In cases like this, the driver would like to
* hold a ref to the fb even though it has already been removed from
* userspace perspective.
* The refcount is stored inside the mode object.
*/
struct kref refcount;
/*
* Place on the dev->mode_config.fb_list, access protected by
* dev->mode_config.fb_lock.
@@ -2377,8 +2379,6 @@ extern int drm_framebuffer_init(struct drm_device *dev,
const struct drm_framebuffer_funcs *funcs);
extern struct drm_framebuffer *drm_framebuffer_lookup(struct drm_device *dev,
uint32_t id);
extern void drm_framebuffer_unreference(struct drm_framebuffer *fb);
extern void drm_framebuffer_reference(struct drm_framebuffer *fb);
extern void drm_framebuffer_remove(struct drm_framebuffer *fb);
extern void drm_framebuffer_cleanup(struct drm_framebuffer *fb);
extern void drm_framebuffer_unregister_private(struct drm_framebuffer *fb);
@@ -2436,6 +2436,8 @@ extern int drm_mode_crtc_set_gamma_size(struct drm_crtc *crtc,
int gamma_size);
extern struct drm_mode_object *drm_mode_object_find(struct drm_device *dev,
uint32_t id, uint32_t type);
void drm_mode_object_reference(struct drm_mode_object *obj);
void drm_mode_object_unreference(struct drm_mode_object *obj);
/* IOCTLs */
extern int drm_mode_getresources(struct drm_device *dev,
@@ -2605,6 +2607,28 @@ static inline uint32_t drm_color_lut_extract(uint32_t user_input,
return clamp_val(val, 0, max);
}
/*
* drm_framebuffer_reference - incr the fb refcnt
* @fb: framebuffer
*
* This functions increments the fb's refcount.
*/
static inline void drm_framebuffer_reference(struct drm_framebuffer *fb)
{
drm_mode_object_reference(&fb->base);
}
/**
* drm_framebuffer_unreference - unref a framebuffer
* @fb: framebuffer to unref
*
* This functions decrements the fb's refcount and frees it if it drops to zero.
*/
static inline void drm_framebuffer_unreference(struct drm_framebuffer *fb)
{
drm_mode_object_unreference(&fb->base);
}
/**
* drm_framebuffer_read_refcount - read the framebuffer reference count.
* @fb: framebuffer
@@ -2613,7 +2637,7 @@ static inline uint32_t drm_color_lut_extract(uint32_t user_input,
*/
static inline uint32_t drm_framebuffer_read_refcount(struct drm_framebuffer *fb)
{
return atomic_read(&fb->refcount.refcount);
return atomic_read(&fb->base.refcount.refcount);
}
/* Plane list iterator for legacy (overlay only) planes. */