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drm: Add DRM_MODESET_LOCK_BEGIN/END helpers

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This patch adds a couple of helpers to remove the boilerplate involved
in grabbing all of the modeset locks.

I've also converted the obvious cases in drm core to use the helpers.

The only remaining instance of drm_modeset_lock_all_ctx() is in
drm_framebuffer. It's complicated by the state clear that occurs on
deadlock. ATM, there's no way to inject code in the deadlock path with
the helpers, so it's unfit for conversion.

Changes in v2:
- Relocate ret argument to the end of the list (Daniel)
- Incorporate Daniel's doc suggestions (Daniel)

Suggested-by: Daniel Vetter <daniel@ffwll.ch>
Reviewed-by: Daniel Vetter <daniel@ffwll.ch>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20181129150423.239081-4-sean@poorly.run
This commit is contained in:
Sean Paul
2018-11-29 10:04:17 -05:00
parent 2aa3eef85d
commit b7ea04d299
6 changed files with 83 additions and 78 deletions
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51
drivers/gpu/drm/drm_atomic_helper.c
View File

@@ -3128,23 +3128,13 @@ void drm_atomic_helper_shutdown(struct drm_device *dev)
struct drm_modeset_acquire_ctx ctx;
int ret;
drm_modeset_acquire_init(&ctx, 0);
while (1) {
ret = drm_modeset_lock_all_ctx(dev, &ctx);
if (!ret)
ret = __drm_atomic_helper_disable_all(dev, &ctx, true);
if (ret != -EDEADLK)
break;
drm_modeset_backoff(&ctx);
}
DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, ret);
ret = __drm_atomic_helper_disable_all(dev, &ctx, true);
if (ret)
DRM_ERROR("Disabling all crtc's during unload failed with %i\n", ret);
drm_modeset_drop_locks(&ctx);
drm_modeset_acquire_fini(&ctx);
DRM_MODESET_LOCK_ALL_END(ctx, ret);
}
EXPORT_SYMBOL(drm_atomic_helper_shutdown);
@@ -3179,14 +3169,7 @@ struct drm_atomic_state *drm_atomic_helper_suspend(struct drm_device *dev)
struct drm_atomic_state *state;
int err;
drm_modeset_acquire_init(&ctx, 0);
retry:
err = drm_modeset_lock_all_ctx(dev, &ctx);
if (err < 0) {
state = ERR_PTR(err);
goto unlock;
}
DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, err);
state = drm_atomic_helper_duplicate_state(dev, &ctx);
if (IS_ERR(state))
@@ -3200,13 +3183,10 @@ retry:
}
unlock:
if (PTR_ERR(state) == -EDEADLK) {
drm_modeset_backoff(&ctx);
goto retry;
}
DRM_MODESET_LOCK_ALL_END(ctx, err);
if (err)
return ERR_PTR(err);
drm_modeset_drop_locks(&ctx);
drm_modeset_acquire_fini(&ctx);
return state;
}
EXPORT_SYMBOL(drm_atomic_helper_suspend);
@@ -3280,22 +3260,11 @@ int drm_atomic_helper_resume(struct drm_device *dev,
drm_mode_config_reset(dev);
drm_modeset_acquire_init(&ctx, 0);
while (1) {
err = drm_modeset_lock_all_ctx(dev, &ctx);
if (err)
goto out;
DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, err);
err = drm_atomic_helper_commit_duplicated_state(state, &ctx);
out:
if (err != -EDEADLK)
break;
err = drm_atomic_helper_commit_duplicated_state(state, &ctx);
drm_modeset_backoff(&ctx);
}
drm_modeset_drop_locks(&ctx);
drm_modeset_acquire_fini(&ctx);
DRM_MODESET_LOCK_ALL_END(ctx, err);
drm_atomic_state_put(state);
return err;