Re: [PATCH 08/13] drm/i915: Add main atomic entrypoints

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On 01/20/2015 05:57 AM, Matt Roper wrote:
Add the top-level atomic entrypoints for check/commit.  These won't get
called yet; we still need to either enable the atomic ioctl or switch to
using the non-transitional atomic helpers for legacy operations.

Signed-off-by: Matt Roper <matthew.d.roper@xxxxxxxxx>
---
  drivers/gpu/drm/i915/Makefile        |   1 +
  drivers/gpu/drm/i915/intel_atomic.c  | 161 +++++++++++++++++++++++++++++++++++
  drivers/gpu/drm/i915/intel_display.c |   2 +
  drivers/gpu/drm/i915/intel_drv.h     |   7 ++
  4 files changed, 171 insertions(+)
  create mode 100644 drivers/gpu/drm/i915/intel_atomic.c

diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index 16e3dc3..c7e2ab5 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -66,6 +66,7 @@ i915-y += dvo_ch7017.o \
  	  dvo_ns2501.o \
  	  dvo_sil164.o \
  	  dvo_tfp410.o \
+	  intel_atomic.o \
  	  intel_atomic_plane.o \
  	  intel_crt.o \
  	  intel_ddi.o \
diff --git a/drivers/gpu/drm/i915/intel_atomic.c b/drivers/gpu/drm/i915/intel_atomic.c
new file mode 100644
index 0000000..1542005
--- /dev/null
+++ b/drivers/gpu/drm/i915/intel_atomic.c
@@ -0,0 +1,161 @@
+/*
+ * Copyright © 2015 Intel Corporation
+ *
+ * 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 (including the next
+ * paragraph) 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 AUTHORS OR COPYRIGHT HOLDERS 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.
+ */
+
+/**
+ * DOC: atomic modeset support
+ *
+ * The functions here implement the state management and hardware programming
+ * dispatch required by the atomic modeset infrastructure.
+ * See intel_atomic_plane.c for the plane-specific atomic functionality.
+ */
+
+#include <drm/drmP.h>
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_plane_helper.h>
+#include "intel_drv.h"
+
+
+/**
+ * intel_atomic_check - validate state object
+ * @dev: drm device
+ * @state: state to validate
+ */
+int intel_atomic_check(struct drm_device *dev,
+		       struct drm_atomic_state *state)
+{
+	int nplanes = dev->mode_config.num_total_plane;
+	int ncrtcs = dev->mode_config.num_crtc;
+	int nconnectors = dev->mode_config.num_connector;
+	int crtc_mask = 0;
+	int ret;
+	int i;
+	bool not_nuclear = false;
+
+	/* Figure out what crtcs are involved */
+	for (i = 0; i < nplanes; i++) {
+		struct drm_plane *plane = state->planes[i];
+		if (!plane)
+			continue;
+		crtc_mask |= plane->possible_crtcs;

This would compute the wrong mask for older gens, where the planes are not mapped to one specific pipe. But we don't support planes at all in that case, so I guess this is fine.

+	}
+
+	/*
+	 * FIXME:  At the moment, we only support "nuclear pageflip" on a
+	 * single CRTC.  Cross-crtc updates will be added later.
+	 */
+	if (hweight32(crtc_mask) > 1) {
+		DRM_DEBUG_KMS("i915 only support atomic plane operations on a single CRTC at the moment\n");
+		return -EINVAL;
+	}
+
+	/*
+	 * FIXME:  We only handle planes for now; make sure there are no CRTC's
+	 * or connectors involved.
+	 */
+	state->allow_modeset = false;
+	for (i = 0; i < ncrtcs; i++)
+		not_nuclear |= (state->crtcs[i] &&
+				drm_crtc_mask(state->crtcs[i]) != crtc_mask);
+	for (i = 0; i < nconnectors; i++)
+		not_nuclear |= (state->connectors[i] != NULL);

I think "if (condition) not_nuclear = true;" would be more clear here.

Ander

+
+	if (not_nuclear) {
+		DRM_DEBUG_KMS("i915 only supports atomic plane operations at the moment\n");
+		return -EINVAL;
+	}
+
+	ret = drm_atomic_helper_check_planes(dev, state);
+	if (ret)
+		return ret;
+
+	return ret;
+}
+
+
+/**
+ * intel_atomic_commit - commit validated state object
+ * @dev: DRM device
+ * @state: the top-level driver state object
+ * @async: asynchronous commit
+ *
+ * This function commits a top-level state object that has been validated
+ * with drm_atomic_helper_check().
+ *
+ * FIXME:  Atomic modeset support for i915 is not yet complete.  At the moment
+ * we can only handle plane-related operations and do not yet support
+ * asynchronous commit.
+ *
+ * RETURNS
+ * Zero for success or -errno.
+ */
+int intel_atomic_commit(struct drm_device *dev,
+			struct drm_atomic_state *state,
+			bool async)
+{
+	int ret;
+	int i;
+
+	if (async) {
+		DRM_DEBUG_KMS("i915 does not yet support async commit\n");
+		return -EINVAL;
+	}
+
+	ret = drm_atomic_helper_prepare_planes(dev, state);
+	if (ret)
+		return ret;
+
+	/* Point of no return */
+
+	/*
+	 * FIXME:  The proper sequence here will eventually be:
+	 *
+	 * drm_atomic_helper_swap_state(dev, state)
+	 * drm_atomic_helper_commit_pre_planes(dev, state);
+	 * drm_atomic_helper_commit_planes(dev, state);
+	 * drm_atomic_helper_commit_post_planes(dev, state);
+	 * drm_atomic_helper_wait_for_vblanks(dev, state);
+	 * drm_atomic_helper_cleanup_planes(dev, state);
+	 * drm_atomic_state_free(state);
+	 *
+	 * once we have full atomic modeset.  For now, just manually update
+	 * plane states to avoid clobbering good states with dummy states
+	 * while nuclear pageflipping.
+	 */
+	for (i = 0; i < dev->mode_config.num_total_plane; i++) {
+		struct drm_plane *plane = state->planes[i];
+
+		if (!plane)
+			continue;
+
+		plane->state->state = state;
+		swap(state->plane_states[i], plane->state);
+		plane->state->state = NULL;
+	}
+	drm_atomic_helper_commit_planes(dev, state);
+	drm_atomic_helper_wait_for_vblanks(dev, state);
+	drm_atomic_helper_cleanup_planes(dev, state);
+	drm_atomic_state_free(state);
+
+	return 0;
+}
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 50ae3b1..0e18879 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -12681,6 +12681,8 @@ static inline void intel_fbdev_output_poll_changed(struct drm_device *dev)
  static const struct drm_mode_config_funcs intel_mode_funcs = {
  	.fb_create = intel_user_framebuffer_create,
  	.output_poll_changed = intel_fbdev_output_poll_changed,
+	.atomic_check = intel_atomic_check,
+	.atomic_commit = intel_atomic_commit,
  };

  /* Set up chip specific display functions */
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 2d9e9a4..503e2f2 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1261,6 +1261,13 @@ void intel_pre_disable_primary(struct drm_crtc *crtc);
  void intel_tv_init(struct drm_device *dev);

  /* intel_atomic.c */
+int intel_atomic_check(struct drm_device *dev,
+		       struct drm_atomic_state *state);
+int intel_atomic_commit(struct drm_device *dev,
+			struct drm_atomic_state *state,
+			bool async);
+
+/* intel_atomic_plane.c */
  struct drm_plane_state *intel_plane_duplicate_state(struct drm_plane *plane);
  void intel_plane_destroy_state(struct drm_plane *plane,
  			       struct drm_plane_state *state);


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