kms: Add MetaKmsMode abstraction

This contains a copy of a drmModeModeInfo, describing a mode. It also
has an unused pointer to the impl device it is associated with. It'll
later be used to get a blob ID for the mode.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1488>

src/backends/native/meta-gpu-kms.c

@@ -41,6 +41,7 @@
 #include "backends/native/meta-crtc-mode-kms.h"
 #include "backends/native/meta-kms-connector.h"
 #include "backends/native/meta-kms-device.h"
+#include "backends/native/meta-kms-mode.h"
 #include "backends/native/meta-kms-update.h"
 #include "backends/native/meta-kms-utils.h"
 #include "backends/native/meta-kms.h"
@@ -410,13 +411,20 @@ init_modes (MetaGpuKms *gpu_kms)
     {
       MetaKmsConnector *kms_connector = l->data;
       const MetaKmsConnectorState *state;
+      GList *l_mode;
 
       state = meta_kms_connector_get_current_state (kms_connector);
       if (!state)
         continue;
 
-      for (i = 0; i < state->n_modes; i++)
+      for (l_mode = state->modes; l_mode; l_mode = l_mode->next)
-        g_hash_table_add (modes_table, &state->modes[i]);
+        {
+          MetaKmsMode *kms_mode = l_mode->data;
+          const drmModeModeInfo *drm_mode =
+            meta_kms_mode_get_drm_mode (kms_mode);
+
+          g_hash_table_add (modes_table, (drmModeModeInfo *) drm_mode);
+        }
     }
 
   modes = NULL;

src/backends/native/meta-kms-connector.c

@@ -27,6 +27,7 @@
 #include "backends/native/meta-kms-crtc.h"
 #include "backends/native/meta-kms-device-private.h"
 #include "backends/native/meta-kms-impl-device.h"
+#include "backends/native/meta-kms-mode-private.h"
 #include "backends/native/meta-kms-update-private.h"
 
 struct _MetaKmsConnector
@@ -354,12 +355,19 @@ state_set_physical_dimensions (MetaKmsConnectorState *state,
 
 static void
 state_set_modes (MetaKmsConnectorState *state,
+                 MetaKmsImplDevice     *impl_device,
                  drmModeConnector      *drm_connector)
 {
-  state->modes =
+  int i;
-    g_memdup (drm_connector->modes,
+
-              drm_connector->count_modes * sizeof (drmModeModeInfo));
+  for (i = 0; i < drm_connector->count_modes; i++)
-  state->n_modes = drm_connector->count_modes;
+    {
+      MetaKmsMode *mode;
+
+      mode = meta_kms_mode_new (impl_device, &drm_connector->modes[i]);
+      state->modes = g_list_prepend (state->modes, mode);
+    }
+  state->modes = g_list_reverse (state->modes);
 }
 
 static void
@@ -452,7 +460,7 @@ static void
 meta_kms_connector_state_free (MetaKmsConnectorState *state)
 {
   g_clear_pointer (&state->edid_data, g_bytes_unref);
-  g_free (state->modes);
+  g_list_free_full (state->modes, (GDestroyNotify) meta_kms_mode_free);
   g_free (state);
 }
 
@@ -480,7 +488,7 @@ meta_kms_connector_read_state (MetaKmsConnector  *connector,
 
   state_set_physical_dimensions (state, drm_connector);
 
-  state_set_modes (state, drm_connector);
+  state_set_modes (state, impl_device, drm_connector);
 
   state_set_crtc_state (state, drm_connector, impl_device, drm_resources);
 

src/backends/native/meta-kms-connector.h

@@ -39,8 +39,7 @@ typedef struct _MetaKmsConnectorState
   uint32_t common_possible_clones;
   uint32_t encoder_device_idxs;
 
-  drmModeModeInfo *modes;
+  GList *modes;
-  int n_modes;
 
   uint32_t width_mm;
   uint32_t height_mm;

src/backends/native/meta-kms-mode-private.h

@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2020 Red Hat
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.
+ */
+
+#ifndef META_KMS_MODE_PRIVATE_H
+#define META_KMS_MODE_PRIVATE_H
+
+#include "backends/native/meta-kms-mode.h"
+
+void meta_kms_mode_free (MetaKmsMode *mode);
+
+MetaKmsMode * meta_kms_mode_new (MetaKmsImplDevice     *impl_device,
+                                 const drmModeModeInfo *drm_mode);
+
+#endif /* META_KMS_MODE_PRIVATE_H */

src/backends/native/meta-kms-mode.c

@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2020 Red Hat
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.
+ */
+
+#include "config.h"
+
+#include "backends/native/meta-kms-mode-private.h"
+
+#include "backends/native/meta-kms-impl-device.h"
+
+struct _MetaKmsMode
+{
+  MetaKmsImplDevice *impl_device;
+  drmModeModeInfo drm_mode;
+};
+
+const drmModeModeInfo *
+meta_kms_mode_get_drm_mode (MetaKmsMode *mode)
+{
+  return &mode->drm_mode;
+}
+
+void
+meta_kms_mode_free (MetaKmsMode *mode)
+{
+  g_free (mode);
+}
+
+MetaKmsMode *
+meta_kms_mode_new (MetaKmsImplDevice     *impl_device,
+                   const drmModeModeInfo *drm_mode)
+{
+  MetaKmsMode *mode;
+
+  mode = g_new0 (MetaKmsMode, 1);
+  mode->impl_device = impl_device;
+  mode->drm_mode = *drm_mode;
+
+  return mode;
+}

src/backends/native/meta-kms-mode.h

@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2020 Red Hat
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.
+ */
+
+#ifndef META_KMS_MODE_H
+#define META_KMS_MODE_H
+
+#include <glib.h>
+#include <xf86drm.h>
+#include <xf86drmMode.h>
+
+#include "backends/native/meta-kms-types.h"
+
+const drmModeModeInfo * meta_kms_mode_get_drm_mode (MetaKmsMode *mode);
+
+#endif /* META_KMS_MODE_H */

src/backends/native/meta-kms-types.h

@@ -33,6 +33,8 @@ typedef struct _MetaKmsUpdate MetaKmsUpdate;
 typedef struct _MetaKmsPlaneAssignment MetaKmsPlaneAssignment;
 typedef struct _MetaKmsModeSet MetaKmsModeSet;
 
+typedef struct _MetaKmsMode MetaKmsMode;
+
 typedef struct _MetaKmsFeedback MetaKmsFeedback;
 
 typedef struct _MetaKmsPageFlipFeedback MetaKmsPageFlipFeedback;

src/backends/native/meta-kms.c

@@ -83,6 +83,12 @@
  * should be presented on a CRTC. Planes can either be primary planes, used as
  * a backdrop for CRTCs, overlay planes, and cursor planes.
  *
+ * #MetaKmsMode:
+ *
+ * Represents a mode a CRTC and connector can be configured with.
+ * Represents both modes directly derived from the devices, as well as
+ * fall back modes when the CRTC supports scaling.
+ *
  * #MetaKmsUpdate:
  *
  * A KMS transaction object, meant to be processed potentially atomically when

src/backends/native/meta-output-kms.c

@@ -30,6 +30,7 @@
 
 #include "backends/meta-crtc.h"
 #include "backends/native/meta-kms-connector.h"
+#include "backends/native/meta-kms-mode.h"
 #include "backends/native/meta-kms-utils.h"
 #include "backends/native/meta-crtc-kms.h"
 #include "backends/native/meta-crtc-mode-kms.h"
@@ -240,17 +241,19 @@ init_output_modes (MetaOutputInfo    *output_info,
                    GError           **error)
 {
   const MetaKmsConnectorState *connector_state;
+  GList *l;
   int i;
 
   connector_state = meta_kms_connector_get_current_state (kms_connector);
 
   output_info->preferred_mode = NULL;
 
-  output_info->n_modes = connector_state->n_modes;
+  output_info->n_modes = g_list_length (connector_state->modes);
   output_info->modes = g_new0 (MetaCrtcMode *, output_info->n_modes);
-  for (i = 0; i < connector_state->n_modes; i++)
+  for (l = connector_state->modes, i = 0; l; l = l->next, i++)
     {
-      drmModeModeInfo *drm_mode = &connector_state->modes[i];
+      MetaKmsMode *kms_mode = l->data;
+      const drmModeModeInfo *drm_mode = meta_kms_mode_get_drm_mode (kms_mode);
       MetaCrtcMode *crtc_mode;
 
       crtc_mode = meta_gpu_kms_get_mode_from_drm_mode (gpu_kms, drm_mode);

src/meson.build

@@ -684,6 +684,8 @@ if have_native_backend
     'backends/native/meta-kms-impl-simple.h',
     'backends/native/meta-kms-impl.c',
     'backends/native/meta-kms-impl.h',
+    'backends/native/meta-kms-mode.c',
+    'backends/native/meta-kms-mode.h',
     'backends/native/meta-kms-page-flip.c',
     'backends/native/meta-kms-page-flip-private.h',
     'backends/native/meta-kms-plane.c',