cregit-Linux how code gets into the kernel

Release 4.11 drivers/gpu/drm/vc4/vc4_kms.c

/*
 * Copyright (C) 2015 Broadcom
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

/**
 * DOC: VC4 KMS
 *
 * This is the general code for implementing KMS mode setting that
 * doesn't clearly associate with any of the other objects (plane,
 * crtc, HDMI encoder).
 */

#include "drm_crtc.h"
#include "drm_atomic.h"
#include "drm_atomic_helper.h"
#include "drm_crtc_helper.h"
#include "drm_plane_helper.h"
#include "drm_fb_cma_helper.h"
#include "vc4_drv.h"


static void vc4_output_poll_changed(struct drm_device *dev) { struct vc4_dev *vc4 = to_vc4_dev(dev); drm_fbdev_cma_hotplug_event(vc4->fbdev); }

Contributors

PersonTokensPropCommitsCommitProp
Derek Foreman28100.00%1100.00%
Total28100.00%1100.00%

struct vc4_commit { struct drm_device *dev; struct drm_atomic_state *state; struct vc4_seqno_cb cb; };
static void vc4_atomic_complete_commit(struct vc4_commit *c) { struct drm_atomic_state *state = c->state; struct drm_device *dev = state->dev; struct vc4_dev *vc4 = to_vc4_dev(dev); drm_atomic_helper_commit_modeset_disables(dev, state); drm_atomic_helper_commit_planes(dev, state, 0); drm_atomic_helper_commit_modeset_enables(dev, state); /* Make sure that drm_atomic_helper_wait_for_vblanks() * actually waits for vblank. If we're doing a full atomic * modeset (as opposed to a vc4_update_plane() short circuit), * then we need to wait for scanout to be done with our * display lists before we free it and potentially reallocate * and overwrite the dlist memory with a new modeset. */ state->legacy_cursor_update = false; drm_atomic_helper_wait_for_vblanks(dev, state); drm_atomic_helper_cleanup_planes(dev, state); drm_atomic_state_put(state); up(&vc4->async_modeset); kfree(c); }

Contributors

PersonTokensPropCommitsCommitProp
Eric Anholt9998.02%250.00%
Chris Wilson10.99%125.00%
Liu Ying10.99%125.00%
Total101100.00%4100.00%


static void vc4_atomic_complete_commit_seqno_cb(struct vc4_seqno_cb *cb) { struct vc4_commit *c = container_of(cb, struct vc4_commit, cb); vc4_atomic_complete_commit(c); }

Contributors

PersonTokensPropCommitsCommitProp
Eric Anholt31100.00%1100.00%
Total31100.00%1100.00%


static struct vc4_commit *commit_init(struct drm_atomic_state *state) { struct vc4_commit *c = kzalloc(sizeof(*c), GFP_KERNEL); if (!c) return NULL; c->dev = state->dev; c->state = state; return c; }

Contributors

PersonTokensPropCommitsCommitProp
Eric Anholt54100.00%1100.00%
Total54100.00%1100.00%

/** * vc4_atomic_commit - commit validated state object * @dev: DRM device * @state: the driver state object * @nonblock: nonblocking commit * * This function commits a with drm_atomic_helper_check() pre-validated state * object. This can still fail when e.g. the framebuffer reservation fails. For * now this doesn't implement asynchronous commits. * * RETURNS * Zero for success or -errno. */
static int vc4_atomic_commit(struct drm_device *dev, struct drm_atomic_state *state, bool nonblock) { struct vc4_dev *vc4 = to_vc4_dev(dev); int ret; int i; uint64_t wait_seqno = 0; struct vc4_commit *c; struct drm_plane *plane; struct drm_plane_state *new_state; c = commit_init(state); if (!c) return -ENOMEM; /* Make sure that any outstanding modesets have finished. */ if (nonblock) { struct drm_crtc *crtc; struct drm_crtc_state *crtc_state; unsigned long flags; bool busy = false; /* * If there's an undispatched event to send then we're * obviously still busy. If there isn't, then we can * unconditionally wait for the semaphore because it * shouldn't be contended (for long). * * This is to prevent a race where queuing a new flip * from userspace immediately on receipt of an event * beats our clean-up and returns EBUSY. */ spin_lock_irqsave(&dev->event_lock, flags); for_each_crtc_in_state(state, crtc, crtc_state, i) busy |= vc4_event_pending(crtc); spin_unlock_irqrestore(&dev->event_lock, flags); if (busy) { kfree(c); return -EBUSY; } } ret = down_interruptible(&vc4->async_modeset); if (ret) { kfree(c); return ret; } ret = drm_atomic_helper_prepare_planes(dev, state); if (ret) { kfree(c); up(&vc4->async_modeset); return ret; } for_each_plane_in_state(state, plane, new_state, i) { if ((plane->state->fb != new_state->fb) && new_state->fb) { struct drm_gem_cma_object *cma_bo = drm_fb_cma_get_gem_obj(new_state->fb, 0); struct vc4_bo *bo = to_vc4_bo(&cma_bo->base); wait_seqno = max(bo->seqno, wait_seqno); } } /* * This is the point of no return - everything below never fails except * when the hw goes bonghits. Which means we can commit the new state on * the software side now. */ drm_atomic_helper_swap_state(state, true); /* * Everything below can be run asynchronously without the need to grab * any modeset locks at all under one condition: It must be guaranteed * that the asynchronous work has either been cancelled (if the driver * supports it, which at least requires that the framebuffers get * cleaned up with drm_atomic_helper_cleanup_planes()) or completed * before the new state gets committed on the software side with * drm_atomic_helper_swap_state(). * * This scheme allows new atomic state updates to be prepared and * checked in parallel to the asynchronous completion of the previous * update. Which is important since compositors need to figure out the * composition of the next frame right after having submitted the * current layout. */ drm_atomic_state_get(state); if (nonblock) { vc4_queue_seqno_cb(dev, &c->cb, wait_seqno, vc4_atomic_complete_commit_seqno_cb); } else { vc4_wait_for_seqno(dev, wait_seqno, ~0ull, false); vc4_atomic_complete_commit(c); } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Eric Anholt22567.77%114.29%
Derek Foreman5315.96%114.29%
Robert Foss257.53%114.29%
Daniel Vetter226.63%228.57%
Chris Wilson51.51%114.29%
Maarten Lankhorst20.60%114.29%
Total332100.00%7100.00%

static const struct drm_mode_config_funcs vc4_mode_funcs = { .output_poll_changed = vc4_output_poll_changed, .atomic_check = drm_atomic_helper_check, .atomic_commit = vc4_atomic_commit, .fb_create = drm_fb_cma_create, };
int vc4_kms_load(struct drm_device *dev) { struct vc4_dev *vc4 = to_vc4_dev(dev); int ret; sema_init(&vc4->async_modeset, 1); ret = drm_vblank_init(dev, dev->mode_config.num_crtc); if (ret < 0) { dev_err(dev->dev, "failed to initialize vblank\n"); return ret; } dev->mode_config.max_width = 2048; dev->mode_config.max_height = 2048; dev->mode_config.funcs = &vc4_mode_funcs; dev->mode_config.preferred_depth = 24; dev->mode_config.async_page_flip = true; drm_mode_config_reset(dev); vc4->fbdev = drm_fbdev_cma_init(dev, 32, dev->mode_config.num_connector); if (IS_ERR(vc4->fbdev)) vc4->fbdev = NULL; drm_kms_helper_poll_init(dev); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Eric Anholt12179.61%250.00%
Derek Foreman3120.39%250.00%
Total152100.00%4100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Eric Anholt59577.37%325.00%
Derek Foreman11715.21%325.00%
Robert Foss253.25%18.33%
Daniel Vetter222.86%216.67%
Chris Wilson60.78%18.33%
Maarten Lankhorst30.39%18.33%
Liu Ying10.13%18.33%
Total769100.00%12100.00%
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