Hi,
On 02/09/2017 12:08 PM, Dhinakaran Pandiyan wrote:
It is necessary to track states for objects other than connector, crtc
and plane for atomic modesets. But adding objects like DP MST link
bandwidth to drm_atomic_state would mean that a non-core object will be
modified by the core helper functions for swapping and clearing
it's state. So, lets add void * objects and helper functions that operate
on void * types to keep these objects and states private to the core.
Drivers can then implement specific functions to swap and clear states.
The other advantage having just void * for these objects in
drm_atomic_state is that objects of different types can be managed in the
same state array.
v2: Added docs and new iterator to filter private objects (Daniel)
Suggested-by: Daniel Vetter <daniel.vet...@ffwll.ch>
Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandi...@intel.com>
---
drivers/gpu/drm/drm_atomic.c | 68 +++++++++++++++++++++++++++
drivers/gpu/drm/drm_atomic_helper.c | 5 ++
include/drm/drm_atomic.h | 91 +++++++++++++++++++++++++++++++++++++
3 files changed, 164 insertions(+)
diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index a567310..1a9ffe8 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -57,6 +57,7 @@ void drm_atomic_state_default_release(struct drm_atomic_state
*state)
kfree(state->connectors);
kfree(state->crtcs);
kfree(state->planes);
+ kfree(state->private_objs);
}
EXPORT_SYMBOL(drm_atomic_state_default_release);
@@ -184,6 +185,20 @@ void drm_atomic_state_default_clear(struct
drm_atomic_state *state)
state->planes[i].ptr = NULL;
state->planes[i].state = NULL;
}
+
+ for (i = 0; i < state->num_private_objs; i++) {
+ void *private_obj = state->private_objs[i].obj;
+ void *obj_state = state->private_objs[i].obj_state;
+
+ if (!private_obj)
+ continue;
+
+ state->private_objs[i].funcs->destroy_state(obj_state);
+ state->private_objs[i].obj = NULL;
+ state->private_objs[i].obj_state = NULL;
+ state->private_objs[i].funcs = NULL;
+ }
+
}
EXPORT_SYMBOL(drm_atomic_state_default_clear);
@@ -974,6 +989,59 @@ static void drm_atomic_plane_print_state(struct
drm_printer *p,
}
/**
+ * drm_atomic_get_private_obj_state - get private object state
+ * @state: global atomic state
+ * @obj: private object to get the state for
+ * @funcs: pointer to the struct of function pointers that identify the object
+ * type
+ *
+ * This function returns the private object state for the given private object,
+ * allocating the state if needed. It does not grab any locks as the caller is
+ * expected to care of any required locking.
+ *
+ * RETURNS:
+ *
+ * Either the allocated state or the error code encoded into a pointer.
+ */
+void *
+drm_atomic_get_private_obj_state(struct drm_atomic_state *state, void *obj,
+ const struct drm_private_state_funcs *funcs)
+{
+ int index, num_objs, i;
+ size_t size;
+ struct __drm_private_objs_state *arr;
+
+ for (i = 0; i < state->num_private_objs; i++)
+ if (obj == state->private_objs[i].obj &&
+ state->private_objs[i].obj_state)
+ return state->private_objs[i].obj_state;
Comparing this func to drm_atomic_get_plane_state/drm_atomic_get_crtc_state, it
doesn't seem to call drm_modeset_lock if the obj_state doesn't already exist. I
don't understand the locking stuff toowell, I just noticed this difference when
comparing this approach with what is done in the msm kms driver (where we
have subclassed drm_atomic_state to msm_kms_state).
Thanks,
Archit
+
+ num_objs = state->num_private_objs + 1;
+ size = sizeof(*state->private_objs) * num_objs;
+ arr = krealloc(state->private_objs, size, GFP_KERNEL);
+ if (!arr)
+ return ERR_PTR(-ENOMEM);
+
+ state->private_objs = arr;
+ index = state->num_private_objs;
+ memset(&state->private_objs[index], 0, sizeof(*state->private_objs));
+
+ state->private_objs[index].obj_state = funcs->duplicate_state(state,
obj);
+ if (!state->private_objs[index].obj_state)
+ return ERR_PTR(-ENOMEM);
+
+ state->private_objs[index].obj = obj;
+ state->private_objs[index].funcs = funcs;
+ state->num_private_objs = num_objs;
+
+ DRM_DEBUG_ATOMIC("Added new private object state %p to %p\n",
+ state->private_objs[index].obj_state, state);
+
+ return state->private_objs[index].obj_state;
+}
+EXPORT_SYMBOL(drm_atomic_get_private_obj_state);
+
+/**
* drm_atomic_get_connector_state - get connector state
* @state: global atomic state object
* @connector: connector to get state object for
diff --git a/drivers/gpu/drm/drm_atomic_helper.c
b/drivers/gpu/drm/drm_atomic_helper.c
index 3a4383f..8795088 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -1983,6 +1983,8 @@ void drm_atomic_helper_swap_state(struct drm_atomic_state
*state,
struct drm_plane *plane;
struct drm_plane_state *plane_state;
struct drm_crtc_commit *commit;
+ void *obj, *obj_state;
+ const struct drm_private_state_funcs *funcs;
if (stall) {
for_each_crtc_in_state(state, crtc, crtc_state, i) {
@@ -2031,6 +2033,9 @@ void drm_atomic_helper_swap_state(struct drm_atomic_state
*state,
swap(state->planes[i].state, plane->state);
plane->state->state = NULL;
}
+
+ __for_each_private_obj(state, obj, obj_state, i, funcs)
+ funcs->swap_state(obj, &state->private_objs[i].obj_state);
}
EXPORT_SYMBOL(drm_atomic_helper_swap_state);
diff --git a/include/drm/drm_atomic.h b/include/drm/drm_atomic.h
index 052ab16..cafa404 100644
--- a/include/drm/drm_atomic.h
+++ b/include/drm/drm_atomic.h
@@ -155,6 +155,53 @@ struct __drm_connnectors_state {
};
/**
+ * struct drm_private_state_funcs - atomic state functions for private objects
+ *
+ * These hooks are used by atomic helpers to create, swap and destroy states of
+ * private objects. The structure itself is used as a vtable to identify the
+ * associated private object type. Each private object type that needs to be
+ * added to the atomic states is expected to have an implementation of these
+ * hooks and pass a pointer to it's drm_private_state_funcs struct to
+ * drm_atomic_get_private_obj_state().
+ */
+struct drm_private_state_funcs {
+ /**
+ * @duplicate_state:
+ *
+ * Duplicate the current state of the private object and return it. It
+ * is an error to call this before obj->state has been initialized.
+ *
+ * RETURNS:
+ *
+ * Duplicated atomic state or NULL when obj->state is not
+ * initialized or allocation failed.
+ */
+ void *(*duplicate_state)(struct drm_atomic_state *state, void *obj);
+
+ /**
+ * @swap_state:
+ *
+ * This function swaps the existing state of a private object @obj with
+ * it's newly created state, the pointer to which is passed as
+ * @obj_state_ptr.
+ */
+ void (*swap_state)(void *obj, void **obj_state_ptr);
+
+ /**
+ * @destroy_state:
+ *
+ * Frees the private object state created with @duplicate_state.
+ */
+ void (*destroy_state)(void *obj_state);
+};
+
+struct __drm_private_objs_state {
+ void *obj;
+ void *obj_state;
+ const struct drm_private_state_funcs *funcs;
+};
+
+/**
* struct drm_atomic_state - the global state object for atomic updates
* @ref: count of all references to this state (will not be freed until zero)
* @dev: parent DRM device
@@ -165,6 +212,8 @@ struct __drm_connnectors_state {
* @crtcs: pointer to array of CRTC pointers
* @num_connector: size of the @connectors and @connector_states arrays
* @connectors: pointer to array of structures with per-connector data
+ * @num_private_objs: size of the @private_objs array
+ * @private_objs: pointer to array of private object pointers
* @acquire_ctx: acquire context for this atomic modeset state update
*/
struct drm_atomic_state {
@@ -178,6 +227,8 @@ struct drm_atomic_state {
struct __drm_crtcs_state *crtcs;
int num_connector;
struct __drm_connnectors_state *connectors;
+ int num_private_objs;
+ struct __drm_private_objs_state *private_objs;
struct drm_modeset_acquire_ctx *acquire_ctx;
@@ -270,6 +321,11 @@ int drm_atomic_connector_set_property(struct drm_connector
*connector,
struct drm_connector_state *state, struct drm_property
*property,
uint64_t val);
+void * __must_check
+drm_atomic_get_private_obj_state(struct drm_atomic_state *state,
+ void *obj,
+ const struct drm_private_state_funcs *funcs);
+
/**
* drm_atomic_get_existing_crtc_state - get crtc state, if it exists
* @state: global atomic state object
@@ -415,6 +471,41 @@ void drm_state_dump(struct drm_device *dev, struct
drm_printer *p);
for_each_if (plane_state)
/**
+ * __for_each_private_obj - iterate over all private objects
+ * @__state: the atomic state
+ *
+ * This macro iterates over the array containing private object data in atomic
+ * state
+ */
+#define __for_each_private_obj(__state, obj, obj_state, __i, __funcs) \
+ for ((__i) = 0; \
+ (__i) < (__state)->num_private_objs && \
+ ((obj) = (__state)->private_objs[__i].obj, \
+ (__funcs) = (__state)->private_objs[__i].funcs, \
+ (obj_state) = (__state)->private_objs[__i].obj_state, 1); \
+ (__i)++) \
+ for_each_if (__funcs)
+
+/**
+ * for_each_private_obj - iterate over a specify type of private object
+ * @__state: the atomic state
+ * @obj_funcs: function table to filter the private objects
+ *
+ * This macro iterates over the private objects state array while filtering the
+ * objects based on the vfunc table that is passed as @obj_funcs. New macros
+ * can be created by passing in the vfunc table associated with a specific
+ * private object.
+ */
+#define for_each_private_obj(__state, obj_funcs, obj, obj_state, __i, __funcs)
\
+ for ((__i) = 0; \
+ (__i) < (__state)->num_private_objs && \
+ ((obj) = (__state)->private_objs[__i].obj, \
+ (__funcs) = (__state)->private_objs[__i].funcs, \
+ (obj_state) = (__state)->private_objs[__i].obj_state, 1); \
+ (__i)++) \
+ for_each_if (__funcs == obj_funcs)
+
+/**
* drm_atomic_crtc_needs_modeset - compute combined modeset need
* @state: &drm_crtc_state for the CRTC
*
--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project
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