drm: Remove drm_modeset_legacy_acquire_ctx and crtc->acquire_ctx

With all the callers of drm_modeset_lock_crtc gone, and all the places
it was formerly used properly wiring the acquire ctx through, we can
remove this.

The only hidden context magic we still have is now the global one.

Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170403083304.9083-4-daniel.vetter@ffwll.ch

7 files changed, 4 insertions, 50 deletions

diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index 9b892af..3453102 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -1516,19 +1516,9 @@ EXPORT_SYMBOL(drm_atomic_add_affected_planes);
 void drm_atomic_legacy_backoff(struct drm_atomic_state *state)
 {
 	struct drm_device *dev = state->dev;
-	unsigned crtc_mask = 0;
-	struct drm_crtc *crtc;
 	int ret;
 	bool global = false;
 
-	drm_for_each_crtc(crtc, dev) {
-		if (crtc->acquire_ctx != state->acquire_ctx)
-			continue;
-
-		crtc_mask |= drm_crtc_mask(crtc);
-		crtc->acquire_ctx = NULL;
-	}
-
 	if (WARN_ON(dev->mode_config.acquire_ctx == state->acquire_ctx)) {
 		global = true;
 
@@ -1542,10 +1532,6 @@ retry:
 	if (ret)
 		goto retry;
 
-	drm_for_each_crtc(crtc, dev)
-		if (drm_crtc_mask(crtc) & crtc_mask)
-			crtc->acquire_ctx = state->acquire_ctx;
-
 	if (global)
 		dev->mode_config.acquire_ctx = state->acquire_ctx;
 }
diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index c3994b4..3160d08 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -2975,7 +2975,7 @@ int drm_atomic_helper_connector_dpms(struct drm_connector *connector,
 	if (!state)
 		return -ENOMEM;
 
-	state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc);
+	state->acquire_ctx = crtc->dev->mode_config.acquire_ctx;
 retry:
 	crtc_state = drm_atomic_get_crtc_state(state, crtc);
 	if (IS_ERR(crtc_state)) {
diff --git a/drivers/gpu/drm/drm_modeset_lock.c b/drivers/gpu/drm/drm_modeset_lock.c
index c3ca6b8..64ef09a 100644
--- a/drivers/gpu/drm/drm_modeset_lock.c
+++ b/drivers/gpu/drm/drm_modeset_lock.c
@@ -149,27 +149,6 @@ void drm_modeset_unlock_all(struct drm_device *dev)
 EXPORT_SYMBOL(drm_modeset_unlock_all);
 
 /**
- * drm_modeset_legacy_acquire_ctx - find acquire ctx for legacy ioctls
- * @crtc: drm crtc
- *
- * Legacy ioctl operations like cursor updates or page flips only have per-crtc
- * locking, and store the acquire ctx in the corresponding crtc. All other
- * legacy operations take all locks and use a global acquire context. This
- * function grabs the right one.
- */
-struct drm_modeset_acquire_ctx *
-drm_modeset_legacy_acquire_ctx(struct drm_crtc *crtc)
-{
-	if (crtc->acquire_ctx)
-		return crtc->acquire_ctx;
-
-	WARN_ON(!crtc->dev->mode_config.acquire_ctx);
-
-	return crtc->dev->mode_config.acquire_ctx;
-}
-EXPORT_SYMBOL(drm_modeset_legacy_acquire_ctx);
-
-/**
  * drm_warn_on_modeset_not_all_locked - check that all modeset locks are locked
  * @dev: device
  *
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index e27ea89..84abff3 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -10715,7 +10715,7 @@ out_hang:
 		state = drm_atomic_state_alloc(dev);
 		if (!state)
 			return -ENOMEM;
-		state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc);
+		state->acquire_ctx = dev->mode_config.acquire_ctx;
 
 retry:
 		plane_state = drm_atomic_get_plane_state(state, primary);
@@ -13075,7 +13075,7 @@ void intel_crtc_restore_mode(struct drm_crtc *crtc)
 		return;
 	}
 
-	state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc);
+	state->acquire_ctx = crtc->dev->mode_config.acquire_ctx;
 
 retry:
 	crtc_state = drm_atomic_get_crtc_state(state, crtc);
diff --git a/drivers/gpu/drm/i915/intel_pipe_crc.c b/drivers/gpu/drm/i915/intel_pipe_crc.c
index 9fd9c70..206ee4f 100644
--- a/drivers/gpu/drm/i915/intel_pipe_crc.c
+++ b/drivers/gpu/drm/i915/intel_pipe_crc.c
@@ -522,7 +522,7 @@ static void hsw_trans_edp_pipe_A_crc_wa(struct drm_i915_private *dev_priv,
 		goto unlock;
 	}
 
-	state->acquire_ctx = drm_modeset_legacy_acquire_ctx(&crtc->base);
+	state->acquire_ctx = crtc->base.dev->mode_config.acquire_ctx;
 	pipe_config = intel_atomic_get_crtc_state(state, crtc);
 	if (IS_ERR(pipe_config)) {
 		ret = PTR_ERR(pipe_config);
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index 2be2192..ede60d6 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -782,15 +782,6 @@ struct drm_crtc {
 	 */
 	spinlock_t commit_lock;
 
-	/**
-	 * @acquire_ctx:
-	 *
-	 * Per-CRTC implicit acquire context used by atomic drivers for legacy
-	 * IOCTLs, so that atomic drivers can get at the locking acquire
-	 * context.
-	 */
-	struct drm_modeset_acquire_ctx *acquire_ctx;
-
 #ifdef CONFIG_DEBUG_FS
 	/**
 	 * @debugfs_entry:
diff --git a/include/drm/drm_modeset_lock.h b/include/drm/drm_modeset_lock.h
index 2bb065b..4b27c2b 100644
--- a/include/drm/drm_modeset_lock.h
+++ b/include/drm/drm_modeset_lock.h
@@ -122,8 +122,6 @@ struct drm_plane;
 void drm_modeset_lock_all(struct drm_device *dev);
 void drm_modeset_unlock_all(struct drm_device *dev);
 void drm_warn_on_modeset_not_all_locked(struct drm_device *dev);
-struct drm_modeset_acquire_ctx *
-drm_modeset_legacy_acquire_ctx(struct drm_crtc *crtc);
 
 int drm_modeset_lock_all_ctx(struct drm_device *dev,
 			     struct drm_modeset_acquire_ctx *ctx);