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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_atomic_uapi.h>
#include <drm/drm_mode.h>
#include <drm/drm_print.h>
#include <drm/drm_writeback.h>
#include <linux/sync_file.h>
#include "drm_crtc_internal.h"
#include "drm_internal.h"
void __drm_crtc_commit_free(struct kref *kref)
{
struct drm_crtc_commit *commit =
container_of(kref, struct drm_crtc_commit, ref);
kfree(commit);
}
EXPORT_SYMBOL(__drm_crtc_commit_free);
/**
* 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 should only be used by drivers which are still subclassing
* &drm_atomic_state and haven't switched to &drm_private_state yet.
*/
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);
/**
* drm_atomic_state_init - init new atomic state
* @dev: DRM device
* @state: atomic state
*
* Default implementation for filling in a new atomic state.
* This should only be used by drivers which are still subclassing
* &drm_atomic_state and haven't switched to &drm_private_state yet.
*/
int
drm_atomic_state_init(struct drm_device *dev, struct drm_atomic_state *state)
{
kref_init(&state->ref);
/* TODO legacy paths should maybe do a better job about
* setting this appropriately?
*/
state->allow_modeset = true;
state->crtcs = kcalloc(dev->mode_config.num_crtc,
sizeof(*state->crtcs), GFP_KERNEL);
if (!state->crtcs)
goto fail;
state->planes = kcalloc(dev->mode_config.num_total_plane,
sizeof(*state->planes), GFP_KERNEL);
if (!state->planes)
goto fail;
state->dev = dev;
DRM_DEBUG_ATOMIC("Allocated atomic state %p\n", state);
return 0;
fail:
drm_atomic_state_default_release(state);
return -ENOMEM;
}
EXPORT_SYMBOL(drm_atomic_state_init);
/**
* 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;
if (!config->funcs->atomic_state_alloc) {
struct drm_atomic_state *state;
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_default_clear - clear base atomic state
* @state: atomic state
*
* Default implementation for clearing atomic state.
* This should only be used by drivers which are still subclassing
* &drm_atomic_state and haven't switched to &drm_private_state yet.
*/
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;
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].ptr;
if (!connector)
continue;
connector->funcs->atomic_destroy_state(connector,
state->connectors[i].state);
state->connectors[i].ptr = NULL;
state->connectors[i].state = NULL;
state->connectors[i].old_state = NULL;
state->connectors[i].new_state = NULL;
drm_connector_put(connector);
}
for (i = 0; i < config->num_crtc; i++) {
struct drm_crtc *crtc = state->crtcs[i].ptr;
if (!crtc)
continue;
crtc->funcs->atomic_destroy_state(crtc,
state->crtcs[i].state);
state->crtcs[i].ptr = NULL;
state->crtcs[i].state = NULL;
state->crtcs[i].old_state = NULL;
state->crtcs[i].new_state = NULL;
if (state->crtcs[i].commit) {
drm_crtc_commit_put(state->crtcs[i].commit);
state->crtcs[i].commit = NULL;
}
}
for (i = 0; i < config->num_total_plane; i++) {
struct drm_plane *plane = state->planes[i].ptr;
if (!plane)
continue;
plane->funcs->atomic_destroy_state(plane,
state->planes[i].state);
state->planes[i].ptr = NULL;
state->planes[i].state = NULL;
state->planes[i].old_state = NULL;
state->planes[i].new_state = NULL;
}
for (i = 0; i < state->num_private_objs; i++) {
struct drm_private_obj *obj = state->private_objs[i].ptr;
obj->funcs->atomic_destroy_state(obj,
state->private_objs[i].state);
state->private_objs[i].ptr = NULL;
state->private_objs[i].state = NULL;
state->private_objs[i].old_state = NULL;
state->private_objs[i].new_state = NULL;
}
state->num_private_objs = 0;
if (state->fake_commit) {
drm_crtc_commit_put(state->fake_commit);
state->fake_commit = 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
* &drm_mode_config_funcs.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);
/**
* __drm_atomic_state_free - free all memory for an atomic state
* @ref: This 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 kref *ref)
{
struct drm_atomic_state *state = container_of(ref, typeof(*state), ref);
struct drm_mode_config *config = &state->dev->mode_config;
drm_atomic_state_clear(state);
DRM_DEBUG_ATOMIC("Freeing atomic state %p\n", 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);
/**
* 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 = drm_crtc_index(crtc);
struct drm_crtc_state *crtc_state;
WARN_ON(!state->acquire_ctx);
crtc_state = drm_atomic_get_existing_crtc_state(state, crtc);
if (crtc_state)
return crtc_state;
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->crtcs[index].state = crtc_state;
state->crtcs[index].old_state = crtc->state;
state->crtcs[index].new_state = crtc_state;
state->crtcs[index].ptr = crtc;
crtc_state->state = state;
DRM_DEBUG_ATOMIC("Added [CRTC:%d:%s] %p state to %p\n",
crtc->base.id, crtc->name, crtc_state, state);
return crtc_state;
}
EXPORT_SYMBOL(drm_atomic_get_crtc_state);
static int drm_atomic_crtc_check(const struct drm_crtc_state *old_crtc_state,
const struct drm_crtc_state *new_crtc_state)
{
struct drm_crtc *crtc = new_crtc_state->crtc;
/* 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 (new_crtc_state->active && !new_crtc_state->enable) {
DRM_DEBUG_ATOMIC("[CRTC:%d:%s] active without enabled\n",
crtc->base.id, crtc->name);
return -EINVAL;
}
/* The state->enable vs. state->mode_blob checks can be WARN_ON,
* as this is a kernel-internal detail that userspace should never
* be able to trigger. */
if (drm_core_check_feature(crtc->dev, DRIVER_ATOMIC) &&
WARN_ON(new_crtc_state->enable && !new_crtc_state->mode_blob)) {
DRM_DEBUG_ATOMIC("[CRTC:%d:%s] enabled without mode blob\n",
crtc->base.id, crtc->name);
return -EINVAL;
}
if (drm_core_check_feature(crtc->dev, DRIVER_ATOMIC) &&
WARN_ON(!new_crtc_state->enable && new_crtc_state->mode_blob)) {
DRM_DEBUG_ATOMIC("[CRTC:%d:%s] disabled with mode blob\n",
crtc->base.id, crtc->name);
return -EINVAL;
}
/*
* Reject event generation for when a CRTC is off and stays off.
* It wouldn't be hard to implement this, but userspace has a track
* record of happily burning through 100% cpu (or worse, crash) when the
* display pipe is suspended. To avoid all that fun just reject updates
* that ask for events since likely that indicates a bug in the
* compositor's drawing loop. This is consistent with the vblank IOCTL
* and legacy page_flip IOCTL which also reject service on a disabled
* pipe.
*/
if (new_crtc_state->event &&
!new_crtc_state->active && !old_crtc_state->active) {
DRM_DEBUG_ATOMIC("[CRTC:%d:%s] requesting event but off\n",
crtc->base.id, crtc->name);
return -EINVAL;
}
return 0;
}
static void drm_atomic_crtc_print_state(struct drm_printer *p,
const struct drm_crtc_state *state)
{
struct drm_crtc *crtc = state->crtc;
drm_printf(p, "crtc[%u]: %s\n", crtc->base.id, crtc->name);
drm_printf(p, "\tenable=%d\n", state->enable);
drm_printf(p, "\tactive=%d\n", state->active);
drm_printf(p, "\tplanes_changed=%d\n", state->planes_changed);
drm_printf(p, "\tmode_changed=%d\n", state->mode_changed);
drm_printf(p, "\tactive_changed=%d\n", state->active_changed);
drm_printf(p, "\tconnectors_changed=%d\n", state->connectors_changed);
drm_printf(p, "\tcolor_mgmt_changed=%d\n", state->color_mgmt_changed);
drm_printf(p, "\tplane_mask=%x\n", state->plane_mask);
drm_printf(p, "\tconnector_mask=%x\n", state->connector_mask);
drm_printf(p, "\tencoder_mask=%x\n", state->encoder_mask);
drm_printf(p, "\tmode: " DRM_MODE_FMT "\n", DRM_MODE_ARG(&state->mode));
if (crtc->funcs->atomic_print_state)
crtc->funcs->atomic_print_state(p, state);
}
static int drm_atomic_connector_check(struct drm_connector *connector,
struct drm_connector_state *state)
{
struct drm_crtc_state *crtc_state;
struct drm_writeback_job *writeback_job = state->writeback_job;
const struct drm_display_info *info = &connector->display_info;
state->max_bpc = info->bpc ? info->bpc : 8;
if (connector->max_bpc_property)
state->max_bpc = min(state->max_bpc, state->max_requested_bpc);
if ((connector->connector_type != DRM_MODE_CONNECTOR_WRITEBACK) || !writeback_job)
return 0;
if (writeback_job->fb && !state->crtc) {
DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] framebuffer without CRTC\n",
connector->base.id, connector->name);
return -EINVAL;
}
if (state->crtc)
crtc_state = drm_atomic_get_existing_crtc_state(state->state,
state->crtc);
if (writeback_job->fb && !crtc_state->active) {
DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] has framebuffer, but [CRTC:%d] is off\n",
connector->base.id, connector->name,
state->crtc->base.id);
return -EINVAL;
}
if (writeback_job->out_fence && !writeback_job->fb) {
DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] requesting out-fence without framebuffer\n",
connector->base.id, connector->name);
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 = drm_plane_index(plane);
struct drm_plane_state *plane_state;
WARN_ON(!state->acquire_ctx);
/* the legacy pointers should never be set */
WARN_ON(plane->fb);
WARN_ON(plane->old_fb);
WARN_ON(plane->crtc);
plane_state = drm_atomic_get_existing_plane_state(state, plane);
if (plane_state)
return plane_state;
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->planes[index].state = plane_state;
state->planes[index].ptr = plane;
state->planes[index].old_state = plane->state;
state->planes[index].new_state = plane_state;
plane_state->state = state;
DRM_DEBUG_ATOMIC("Added [PLANE:%d:%s] %p state to %p\n",
plane->base.id, plane->name, 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);
static bool
plane_switching_crtc(const struct drm_plane_state *old_plane_state,
const struct drm_plane_state *new_plane_state)
{
if (!old_plane_state->crtc || !new_plane_state->crtc)
return false;
if (old_plane_state->crtc == new_plane_state->crtc)
return false;
/* This could be refined, but currently there's no helper or driver code
* to implement direct switching of active planes nor userspace to take
* advantage of more direct plane switching without the intermediate
* full OFF state.
*/
return true;
}
/**
* drm_atomic_plane_check - check plane state
* @old_plane_state: old plane state to check
* @new_plane_state: new 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(const struct drm_plane_state *old_plane_state,
const struct drm_plane_state *new_plane_state)
{
struct drm_plane *plane = new_plane_state->plane;
struct drm_crtc *crtc = new_plane_state->crtc;
const struct drm_framebuffer *fb = new_plane_state->fb;
unsigned int fb_width, fb_height;
struct drm_mode_rect *clips;
uint32_t num_clips;
int ret;
/* either *both* CRTC and FB must be set, or neither */
if (crtc && !fb) {
DRM_DEBUG_ATOMIC("[PLANE:%d:%s] CRTC set but no FB\n",
plane->base.id, plane->name);
return -EINVAL;
} else if (fb && !crtc) {
DRM_DEBUG_ATOMIC("[PLANE:%d:%s] FB set but no CRTC\n",
plane->base.id, plane->name);
return -EINVAL;
}
/* if disabled, we don't care about the rest of the state: */
if (!crtc)
return 0;
/* Check whether this plane is usable on this CRTC */
if (!(plane->possible_crtcs & drm_crtc_mask(crtc))) {
DRM_DEBUG_ATOMIC("Invalid [CRTC:%d:%s] for [PLANE:%d:%s]\n",
crtc->base.id, crtc->name,
plane->base.id, plane->name);
return -EINVAL;
}
/* Check whether this plane supports the fb pixel format. */
ret = drm_plane_check_pixel_format(plane, fb->format->format,
fb->modifier);
if (ret) {
struct drm_format_name_buf format_name;
DRM_DEBUG_ATOMIC("[PLANE:%d:%s] invalid pixel format %s, modifier 0x%llx\n",
plane->base.id, plane->name,
drm_get_format_name(fb->format->format,
&format_name),
fb->modifier);
return ret;
}
/* Give drivers some help against integer overflows */
if (new_plane_state->crtc_w > INT_MAX ||
new_plane_state->crtc_x > INT_MAX - (int32_t) new_plane_state->crtc_w ||
new_plane_state->crtc_h > INT_MAX ||
new_plane_state->crtc_y > INT_MAX - (int32_t) new_plane_state->crtc_h) {
DRM_DEBUG_ATOMIC("[PLANE:%d:%s] invalid CRTC coordinates %ux%u+%d+%d\n",
plane->base.id, plane->name,
new_plane_state->crtc_w, new_plane_state->crtc_h,
new_plane_state->crtc_x, new_plane_state->crtc_y);
return -ERANGE;
}
fb_width = fb->width << 16;
fb_height = fb->height << 16;
/* Make sure source coordinates are inside the fb. */
if (new_plane_state->src_w > fb_width ||
new_plane_state->src_x > fb_width - new_plane_state->src_w ||
new_plane_state->src_h > fb_height ||
new_plane_state->src_y > fb_height - new_plane_state->src_h) {
DRM_DEBUG_ATOMIC("[PLANE:%d:%s] invalid source coordinates "
"%u.%06ux%u.%06u+%u.%06u+%u.%06u (fb %ux%u)\n",
plane->base.id, plane->name,
new_plane_state->src_w >> 16,
((new_plane_state->src_w & 0xffff) * 15625) >> 10,
new_plane_state->src_h >> 16,
((new_plane_state->src_h & 0xffff) * 15625) >> 10,
new_plane_state->src_x >> 16,
((new_plane_state->src_x & 0xffff) * 15625) >> 10,
new_plane_state->src_y >> 16,
((new_plane_state->src_y & 0xffff) * 15625) >> 10,
fb->width, fb->height);
return -ENOSPC;
}
clips = drm_plane_get_damage_clips(new_plane_state);
num_clips = drm_plane_get_damage_clips_count(new_plane_state);
/* Make sure damage clips are valid and inside the fb. */
while (num_clips > 0) {
if (clips->x1 >= clips->x2 ||
clips->y1 >= clips->y2 ||
clips->x1 < 0 ||
clips->y1 < 0 ||
clips->x2 > fb_width ||
clips->y2 > fb_height) {
DRM_DEBUG_ATOMIC("[PLANE:%d:%s] invalid damage clip %d %d %d %d\n",
plane->base.id, plane->name, clips->x1,
clips->y1, clips->x2, clips->y2);
return -EINVAL;
}
clips++;
num_clips--;
}
if (plane_switching_crtc(old_plane_state, new_plane_state)) {
DRM_DEBUG_ATOMIC("[PLANE:%d:%s] switching CRTC directly\n",
plane->base.id, plane->name);
return -EINVAL;
}
return 0;
}
static void drm_atomic_plane_print_state(struct drm_printer *p,
const struct drm_plane_state *state)
{
struct drm_plane *plane = state->plane;
struct drm_rect src = drm_plane_state_src(state);
struct drm_rect dest = drm_plane_state_dest(state);
drm_printf(p, "plane[%u]: %s\n", plane->base.id, plane->name);
drm_printf(p, "\tcrtc=%s\n", state->crtc ? state->crtc->name : "(null)");
drm_printf(p, "\tfb=%u\n", state->fb ? state->fb->base.id : 0);
if (state->fb)
drm_framebuffer_print_info(p, 2, state->fb);
drm_printf(p, "\tcrtc-pos=" DRM_RECT_FMT "\n", DRM_RECT_ARG(&dest));
drm_printf(p, "\tsrc-pos=" DRM_RECT_FP_FMT "\n", DRM_RECT_FP_ARG(&src));
drm_printf(p, "\trotation=%x\n", state->rotation);
drm_printf(p, "\tnormalized-zpos=%x\n", state->normalized_zpos);
drm_printf(p, "\tcolor-encoding=%s\n",
drm_get_color_encoding_name(state->color_encoding));
drm_printf(p, "\tcolor-range=%s\n",
drm_get_color_range_name(state->color_range));
if (plane->funcs->atomic_print_state)
plane->funcs->atomic_print_state(p, state);
}
/**
* DOC: handling driver private state
*
* Very often the DRM objects exposed to userspace in the atomic modeset api
* (&drm_connector, &drm_crtc and &drm_plane) do not map neatly to the
* underlying hardware. Especially for any kind of shared resources (e.g. shared
* clocks, scaler units, bandwidth and fifo limits shared among a group of
* planes or CRTCs, and so on) it makes sense to model these as independent
* objects. Drivers then need to do similar state tracking and commit ordering for
* such private (since not exposed to userpace) objects as the atomic core and
* helpers already provide for connectors, planes and CRTCs.
*
* To make this easier on drivers the atomic core provides some support to track
* driver private state objects using struct &drm_private_obj, with the
* associated state struct &drm_private_state.
*
* Similar to userspace-exposed objects, private state structures can be
* acquired by calling drm_atomic_get_private_obj_state(). Since this function
* does not take care of locking, drivers should wrap it for each type of
* private state object they have with the required call to drm_modeset_lock()
* for the corresponding &drm_modeset_lock.
*
* All private state structures contained in a &drm_atomic_state update can be
* iterated using for_each_oldnew_private_obj_in_state(),
* for_each_new_private_obj_in_state() and for_each_old_private_obj_in_state().
* Drivers are recommended to wrap these for each type of driver private state
* object they have, filtering on &drm_private_obj.funcs using for_each_if(), at
* least if they want to iterate over all objects of a given type.
*
* An earlier way to handle driver private state was by subclassing struct
* &drm_atomic_state. But since that encourages non-standard ways to implement
* the check/commit split atomic requires (by using e.g. "check and rollback or
* commit instead" of "duplicate state, check, then either commit or release
* duplicated state) it is deprecated in favour of using &drm_private_state.
*/
/**
* drm_atomic_private_obj_init - initialize private object
* @dev: DRM device this object will be attached to
* @obj: private object
* @state: initial private object state
* @funcs: pointer to the struct of function pointers that identify the object
* type
*
* Initialize the private object, which can be embedded into any
* driver private object that needs its own atomic state.
*/
void
drm_atomic_private_obj_init(struct drm_device *dev,
struct drm_private_obj *obj,
struct drm_private_state *state,
const struct drm_private_state_funcs *funcs)
{
memset(obj, 0, sizeof(*obj));
drm_modeset_lock_init(&obj->lock);
obj->state = state;
obj->funcs = funcs;
list_add_tail(&obj->head, &dev->mode_config.privobj_list);
}
EXPORT_SYMBOL(drm_atomic_private_obj_init);
/**
* drm_atomic_private_obj_fini - finalize private object
* @obj: private object
*
* Finalize the private object.
*/
void
drm_atomic_private_obj_fini(struct drm_private_obj *obj)
{
list_del(&obj->head);
obj->funcs->atomic_destroy_state(obj, obj->state);
drm_modeset_lock_fini(&obj->lock);
}
EXPORT_SYMBOL(drm_atomic_private_obj_fini);
/**
* drm_atomic_get_private_obj_state - get private object state
* @state: global atomic state
* @obj: private object to get the state for
*
* This function returns the private object state for the given private object,
* allocating the state if needed. It will also grab the relevant private
* object lock to make sure that the state is consistent.
*
* RETURNS:
*
* Either the allocated state or the error code encoded into a pointer.
*/
struct drm_private_state *
drm_atomic_get_private_obj_state(struct drm_atomic_state *state,
struct drm_private_obj *obj)
{
int index, num_objs, i, ret;
size_t size;
struct __drm_private_objs_state *arr;
struct drm_private_state *obj_state;
for (i = 0; i < state->num_private_objs; i++)
if (obj == state->private_objs[i].ptr)
return state->private_objs[i].state;
ret = drm_modeset_lock(&obj->lock, state->acquire_ctx);
if (ret)
return ERR_PTR(ret);
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));
obj_state = obj->funcs->atomic_duplicate_state(obj);
if (!obj_state)
return ERR_PTR(-ENOMEM);
state->private_objs[index].state = obj_state;
state->private_objs[index].old_state = obj->state;
state->private_objs[index].new_state = obj_state;
state->private_objs[index].ptr = obj;
obj_state->state = state;
state->num_private_objs = num_objs;
DRM_DEBUG_ATOMIC("Added new private object %p state %p to %p\n",
obj, obj_state, state);
return 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
*
* 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;
WARN_ON(!state->acquire_ctx);
ret = drm_modeset_lock(&config->connection_mutex, state->acquire_ctx);
if (ret)
return ERR_PTR(ret);
index = drm_connector_index(connector);
if (index >= state->num_connector) {
struct __drm_connnectors_state *c;
int alloc = max(index + 1, config->num_connector);
c = krealloc(state->connectors, alloc * sizeof(*state->connectors), GFP_KERNEL);
if (!c)
return ERR_PTR(-ENOMEM);
state->connectors = c;
memset(&state->connectors[state->num_connector], 0,
sizeof(*state->connectors) * (alloc - state->num_connector));
state->num_connector = alloc;
}
if (state->connectors[index].state)
return state->connectors[index].state;
connector_state = connector->funcs->atomic_duplicate_state(connector);
if (!connector_state)
return ERR_PTR(-ENOMEM);
drm_connector_get(connector);
state->connectors[index].state = connector_state;
state->connectors[index].old_state = connector->state;
state->connectors[index].new_state = connector_state;
state->connectors[index].ptr = connector;
connector_state->state = state;
DRM_DEBUG_ATOMIC("Added [CONNECTOR:%d:%s] %p state to %p\n",
connector->base.id, connector->name,
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);
static void drm_atomic_connector_print_state(struct drm_printer *p,
const struct drm_connector_state *state)
{
struct drm_connector *connector = state->connector;
drm_printf(p, "connector[%u]: %s\n", connector->base.id, connector->name);
drm_printf(p, "\tcrtc=%s\n", state->crtc ? state->crtc->name : "(null)");
if (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK)
if (state->writeback_job && state->writeback_job->fb)
drm_printf(p, "\tfb=%d\n", state->writeback_job->fb->base.id);
if (connector->funcs->atomic_print_state)
connector->funcs->atomic_print_state(p, state);
}
/**
* 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;
struct drm_connector_list_iter conn_iter;
struct drm_crtc_state *crtc_state;
int ret;
crtc_state = drm_atomic_get_crtc_state(state, crtc);
if (IS_ERR(crtc_state))
return PTR_ERR(crtc_state);
ret = drm_modeset_lock(&config->connection_mutex, state->acquire_ctx);
if (ret)
return ret;
DRM_DEBUG_ATOMIC("Adding all current connectors for [CRTC:%d:%s] to %p\n",
crtc->base.id, crtc->name, state);
/*
* Changed connectors are already in @state, so only need to look
* at the connector_mask in crtc_state.
*/
drm_connector_list_iter_begin(state->dev, &conn_iter);
drm_for_each_connector_iter(connector, &conn_iter) {
if (!(crtc_state->connector_mask & drm_connector_mask(connector)))
continue;
conn_state = drm_atomic_get_connector_state(state, connector);
if (IS_ERR(conn_state)) {
drm_connector_list_iter_end(&conn_iter);
return PTR_ERR(conn_state);
}
}
drm_connector_list_iter_end(&conn_iter);
return 0;
}
EXPORT_SYMBOL(drm_atomic_add_affected_connectors);
/**
* drm_atomic_add_affected_planes - add planes for crtc
* @state: atomic state
* @crtc: DRM crtc
*
* This function walks the current configuration and adds all planes
* currently used by @crtc to the atomic configuration @state. This is useful
* when an atomic commit also needs to check all currently enabled plane on
* @crtc, e.g. when changing the mode. It's also useful when re-enabling a CRTC
* to avoid special code to force-enable all planes.
*
* Since acquiring a plane state will always also acquire the w/w mutex of the
* current CRTC for that plane (if there is any) adding all the plane states for
* a CRTC will not reduce parallism of atomic updates.
*
* 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_planes(struct drm_atomic_state *state,
struct drm_crtc *crtc)
{
const struct drm_crtc_state *old_crtc_state =
drm_atomic_get_old_crtc_state(state, crtc);
struct drm_plane *plane;
WARN_ON(!drm_atomic_get_new_crtc_state(state, crtc));
DRM_DEBUG_ATOMIC("Adding all current planes for [CRTC:%d:%s] to %p\n",
crtc->base.id, crtc->name, state);
drm_for_each_plane_mask(plane, state->dev, old_crtc_state->plane_mask) {
struct drm_plane_state *plane_state =
drm_atomic_get_plane_state(state, plane);
if (IS_ERR(plane_state))
return PTR_ERR(plane_state);
}
return 0;
}
EXPORT_SYMBOL(drm_atomic_add_affected_planes);
/**
* 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 *old_plane_state;
struct drm_plane_state *new_plane_state;
struct drm_crtc *crtc;
struct drm_crtc_state *old_crtc_state;
struct drm_crtc_state *new_crtc_state;
struct drm_connector *conn;
struct drm_connector_state *conn_state;
int i, ret = 0;
DRM_DEBUG_ATOMIC("checking %p\n", state);
for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i) {
ret = drm_atomic_plane_check(old_plane_state, new_plane_state);
if (ret) {
DRM_DEBUG_ATOMIC("[PLANE:%d:%s] atomic core check failed\n",
plane->base.id, plane->name);
return ret;
}
}
for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
ret = drm_atomic_crtc_check(old_crtc_state, new_crtc_state);
if (ret) {
DRM_DEBUG_ATOMIC("[CRTC:%d:%s] atomic core check failed\n",
crtc->base.id, crtc->name);
return ret;
}
}
for_each_new_connector_in_state(state, conn, conn_state, i) {
ret = drm_atomic_connector_check(conn, conn_state);
if (ret) {
DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] atomic core check failed\n",
conn->base.id, conn->name);
return ret;
}
}
if (config->funcs->atomic_check) {
ret = config->funcs->atomic_check(state->dev, state);
if (ret) {
DRM_DEBUG_ATOMIC("atomic driver check for %p failed: %d\n",
state, ret);
return ret;
}
}
if (!state->allow_modeset) {
for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
if (drm_atomic_crtc_needs_modeset(new_crtc_state)) {
DRM_DEBUG_ATOMIC("[CRTC:%d:%s] requires full modeset\n",
crtc->base.id, crtc->name);
return -EINVAL;
}
}
}
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.
*
* This function will take its own reference on @state.
* Callers should always release their reference with drm_atomic_state_put().
*
* 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("committing %p\n", state);
return config->funcs->atomic_commit(state->dev, state, false);
}
EXPORT_SYMBOL(drm_atomic_commit);
/**
* drm_atomic_nonblocking_commit - atomic nonblocking 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.
*
* This function will take its own reference on @state.
* Callers should always release their reference with drm_atomic_state_put().
*
* Returns:
* 0 on success, negative error code on failure.
*/
int drm_atomic_nonblocking_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("committing %p nonblocking\n", state);
return config->funcs->atomic_commit(state->dev, state, true);
}
EXPORT_SYMBOL(drm_atomic_nonblocking_commit);
void drm_atomic_print_state(const struct drm_atomic_state *state)
{
struct drm_printer p = drm_info_printer(state->dev->dev);
struct drm_plane *plane;
struct drm_plane_state *plane_state;
struct drm_crtc *crtc;
struct drm_crtc_state *crtc_state;
struct drm_connector *connector;
struct drm_connector_state *connector_state;
int i;
DRM_DEBUG_ATOMIC("checking %p\n", state);
for_each_new_plane_in_state(state, plane, plane_state, i)
drm_atomic_plane_print_state(&p, plane_state);
for_each_new_crtc_in_state(state, crtc, crtc_state, i)
drm_atomic_crtc_print_state(&p, crtc_state);
for_each_new_connector_in_state(state, connector, connector_state, i)
drm_atomic_connector_print_state(&p, connector_state);
}
static void __drm_state_dump(struct drm_device *dev, struct drm_printer *p,
bool take_locks)
{
struct drm_mode_config *config = &dev->mode_config;
struct drm_plane *plane;
struct drm_crtc *crtc;
struct drm_connector *connector;
struct drm_connector_list_iter conn_iter;
if (!drm_drv_uses_atomic_modeset(dev))
return;
list_for_each_entry(plane, &config->plane_list, head) {
if (take_locks)
drm_modeset_lock(&plane->mutex, NULL);
drm_atomic_plane_print_state(p, plane->state);
if (take_locks)
drm_modeset_unlock(&plane->mutex);
}
list_for_each_entry(crtc, &config->crtc_list, head) {
if (take_locks)
drm_modeset_lock(&crtc->mutex, NULL);
drm_atomic_crtc_print_state(p, crtc->state);
if (take_locks)
drm_modeset_unlock(&crtc->mutex);
}
drm_connector_list_iter_begin(dev, &conn_iter);
if (take_locks)
drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
drm_for_each_connector_iter(connector, &conn_iter)
drm_atomic_connector_print_state(p, connector->state);
if (take_locks)
drm_modeset_unlock(&dev->mode_config.connection_mutex);
drm_connector_list_iter_end(&conn_iter);
}
/**
* drm_state_dump - dump entire device atomic state
* @dev: the drm device
* @p: where to print the state to
*
* Just for debugging. Drivers might want an option to dump state
* to dmesg in case of error irq's. (Hint, you probably want to
* ratelimit this!)
*
* The caller must drm_modeset_lock_all(), or if this is called
* from error irq handler, it should not be enabled by default.
* (Ie. if you are debugging errors you might not care that this
* is racey. But calling this without all modeset locks held is
* not inherently safe.)
*/
void drm_state_dump(struct drm_device *dev, struct drm_printer *p)
{
__drm_state_dump(dev, p, false);
}
EXPORT_SYMBOL(drm_state_dump);
#ifdef CONFIG_DEBUG_FS
static int drm_state_info(struct seq_file *m, void *data)
{
struct drm_info_node *node = (struct drm_info_node *) m->private;
struct drm_device *dev = node->minor->dev;
struct drm_printer p = drm_seq_file_printer(m);
__drm_state_dump(dev, &p, true);
return 0;
}
/* any use in debugfs files to dump individual planes/crtc/etc? */
static const struct drm_info_list drm_atomic_debugfs_list[] = {
{"state", drm_state_info, 0},
};
int drm_atomic_debugfs_init(struct drm_minor *minor)
{
return drm_debugfs_create_files(drm_atomic_debugfs_list,
ARRAY_SIZE(drm_atomic_debugfs_list),
minor->debugfs_root, minor);
}
#endif
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