drm_hwcomposer: Add platformmeson for Amlogic SoC support

This specific platform handler is dedicated for the Amlogic SoC,
and more precisely for the Amlogic G12A family.

OpenGL/Mali allocation is done via a slightly modified ARM Gralloc
module, thus needing a custom platform handler to handle the custom
private_handle_t structure.

This platformmeson is based on platformhisi without the AFBC YUV
management (not handled by the Amlogic SoCs).

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>

Change-Id: I1a1d20b0a84b0e17aa3417c8e9633712f258523d

3 files changed, 191 insertions, 0 deletions

diff --git a/Android.bp b/Android.bp
index 2af4548..cd28e41 100644
--- a/Android.bp
+++ b/Android.bp
@@ -110,3 +110,12 @@ filegroup {
         "platformhisi.cpp",
     ],
 }
+
+// Used by hwcomposer.drm_meson
+filegroup {
+    name: "drm_hwcomposer_platformmeson",
+    srcs: [
+        "platformdrmgeneric.cpp",
+        "platformmeson.cpp",
+    ],
+}
diff --git a/platformmeson.cpp b/platformmeson.cpp
new file mode 100644
index 0000000..58ec5c0
--- /dev/null
+++ b/platformmeson.cpp
@@ -0,0 +1,140 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "hwc-platform-meson"
+
+#include "platformmeson.h"
+#include "drmdevice.h"
+#include "platform.h"
+
+#include <drm/drm_fourcc.h>
+#include <stdatomic.h>
+#include <xf86drm.h>
+#include <xf86drmMode.h>
+#include <cinttypes>
+
+#include <hardware/gralloc.h>
+#include <log/log.h>
+#include "gralloc_priv.h"
+
+namespace android {
+
+Importer *Importer::CreateInstance(DrmDevice *drm) {
+  MesonImporter *importer = new MesonImporter(drm);
+  if (!importer)
+    return NULL;
+
+  int ret = importer->Init();
+  if (ret) {
+    ALOGE("Failed to initialize the meson importer %d", ret);
+    delete importer;
+    return NULL;
+  }
+  return importer;
+}
+
+#if defined(MALI_GRALLOC_INTFMT_AFBC_BASIC) && \
+    defined(AFBC_FORMAT_MOD_BLOCK_SIZE_16x16)
+uint64_t MesonImporter::ConvertGrallocFormatToDrmModifiers(uint64_t flags) {
+  uint64_t features = 0UL;
+
+  if (flags & MALI_GRALLOC_INTFMT_AFBC_BASIC)
+    features |= AFBC_FORMAT_MOD_BLOCK_SIZE_16x16;
+
+  if (flags & MALI_GRALLOC_INTFMT_AFBC_SPLITBLK)
+    features |= (AFBC_FORMAT_MOD_SPLIT | AFBC_FORMAT_MOD_SPARSE);
+
+  if (flags & MALI_GRALLOC_INTFMT_AFBC_WIDEBLK)
+    features |= AFBC_FORMAT_MOD_BLOCK_SIZE_32x8;
+
+  if (flags & MALI_GRALLOC_INTFMT_AFBC_TILED_HEADERS)
+    features |= AFBC_FORMAT_MOD_TILED;
+
+  if (features)
+    return DRM_FORMAT_MOD_ARM_AFBC(features | AFBC_FORMAT_MOD_YTR);
+
+  return 0;
+}
+#else
+uint64_t MesonImporter::ConvertGrallocFormatToDrmModifiers(
+    uint64_t /* flags */) {
+  return 0;
+}
+#endif
+
+int MesonImporter::ImportBuffer(buffer_handle_t handle, hwc_drm_bo_t *bo) {
+  uint64_t modifiers[4] = {0};
+
+  memset(bo, 0, sizeof(hwc_drm_bo_t));
+
+  private_handle_t const *hnd = reinterpret_cast<private_handle_t const *>(
+      handle);
+  if (!hnd)
+    return -EINVAL;
+
+  // We can't import these types of buffers.
+  // These buffers should have been filtered out with CanImportBuffer()
+  if (!(hnd->usage & GRALLOC_USAGE_HW_FB))
+    return -EINVAL;
+
+  uint32_t gem_handle;
+  int ret = drmPrimeFDToHandle(drm_->fd(), hnd->share_fd, &gem_handle);
+  if (ret) {
+    ALOGE("failed to import prime fd %d ret=%d", hnd->share_fd, ret);
+    return ret;
+  }
+
+  int32_t fmt = ConvertHalFormatToDrm(hnd->req_format);
+  if (fmt < 0)
+    return fmt;
+
+  modifiers[0] = ConvertGrallocFormatToDrmModifiers(hnd->internal_format);
+
+  bo->width = hnd->width;
+  bo->height = hnd->height;
+  bo->hal_format = hnd->req_format;
+  bo->format = fmt;
+  bo->usage = hnd->usage;
+  bo->pixel_stride = hnd->stride;
+  bo->pitches[0] = hnd->byte_stride;
+  bo->gem_handles[0] = gem_handle;
+  bo->offsets[0] = 0;
+
+  ret = drmModeAddFB2WithModifiers(drm_->fd(), bo->width, bo->height,
+                                   bo->format, bo->gem_handles, bo->pitches,
+                                   bo->offsets, modifiers, &bo->fb_id,
+                                   modifiers[0] ? DRM_MODE_FB_MODIFIERS : 0);
+
+  if (ret) {
+    ALOGE("could not create drm fb %d", ret);
+    return ret;
+  }
+
+  return ret;
+}
+
+bool MesonImporter::CanImportBuffer(buffer_handle_t handle) {
+  private_handle_t const *hnd = reinterpret_cast<private_handle_t const *>(
+      handle);
+  return hnd && (hnd->usage & GRALLOC_USAGE_HW_FB);
+}
+
+std::unique_ptr<Planner> Planner::CreateInstance(DrmDevice *) {
+  std::unique_ptr<Planner> planner(new Planner);
+  planner->AddStage<PlanStageGreedy>();
+  return planner;
+}
+}  // namespace android
diff --git a/platformmeson.h b/platformmeson.h
new file mode 100644
index 0000000..7be7702
--- /dev/null
+++ b/platformmeson.h
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_PLATFORM_HISI_H_
+#define ANDROID_PLATFORM_HISI_H_
+
+#include "drmdevice.h"
+#include "platform.h"
+#include "platformdrmgeneric.h"
+
+#include <stdatomic.h>
+
+#include <hardware/gralloc.h>
+
+namespace android {
+
+class MesonImporter : public DrmGenericImporter {
+ public:
+  using DrmGenericImporter::DrmGenericImporter;
+
+  int ImportBuffer(buffer_handle_t handle, hwc_drm_bo_t *bo) override;
+  bool CanImportBuffer(buffer_handle_t handle) override;
+
+ private:
+  uint64_t ConvertGrallocFormatToDrmModifiers(uint64_t flags);
+};
+}  // namespace android
+
+#endif