guest/hals/gralloc/legacy/framebuffer.cpp

/*
 * Copyright (C) 2016 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.
 */
#include <sys/mman.h>

#include <dlfcn.h>

#include <cutils/ashmem.h>
#include <cutils/log.h>
#include <cutils/properties.h>

#include <sys/system_properties.h>

#include <hardware/hardware.h>
#include <hardware/gralloc.h>

#include <fcntl.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <string.h>
#include <stdlib.h>

#include <cutils/atomic.h>
#include <private/android_filesystem_config.h>

#if defined(__ANDROID__)
#include <linux/fb.h>
#endif

#include "gralloc_vsoc_priv.h"
#include "region_registry.h"

#include "common/libs/auto_resources/auto_resources.h"
#include "common/libs/threads/cuttlefish_thread.h"
#include "common/vsoc/lib/fb_bcast_region_view.h"
#include "common/vsoc/lib/framebuffer_region_view.h"
#include "common/vsoc/shm/framebuffer_layout.h"

using vsoc::framebuffer::FBBroadcastRegionView;
using vsoc::framebuffer::FrameBufferRegionView;

/*****************************************************************************/

struct fb_context_t {
  framebuffer_device_t  device;
};

/*****************************************************************************/

static int fb_setSwapInterval(struct framebuffer_device_t* dev, int interval) {
  if (interval < dev->minSwapInterval || interval > dev->maxSwapInterval) {
    return -EINVAL;
  }
  // FIXME: implement fb_setSwapInterval
  return 0;
}

/*
 * These functions (and probably the entire framebuffer device) are most likely
 * not used when the hardware composer device is present, however is hard to be
 * 100% sure.
 */
static int fb_setUpdateRect(
    struct framebuffer_device_t* dev __unused, int l, int t, int w, int h) {
  if (((w|h) <= 0) || ((l|t)<0)) {
    return -EINVAL;
  }
  // TODO(jemoreira): Find a way to broadcast this with the framebuffer control.
  return 0;
}

static int fb_post(struct framebuffer_device_t* dev __unused,
                   buffer_handle_t buffer) {
  const int offset = OffsetFromHandle(buffer);
  if (offset < 0 ) {
    return offset;
  }
  FBBroadcastRegionView::GetInstance()->BroadcastNewFrame(offset);
  return 0;
}

/*****************************************************************************/

int initUserspaceFrameBuffer(struct private_module_t* module) {
  cvd::LockGuard<pthread_mutex_t> guard(module->lock);
  if (module->framebuffer) {
    return 0;
  }

  // TODO(jemoreira): This assumes the location of the region device nodes, it
  // should get the path from a more centralized place and have the guest region
  // control use that as well.
  std::string fb_file_path = std::string("/dev/").append(
      vsoc::layout::framebuffer::FrameBufferLayout::region_name);
  int fd;
  if ((fd = open(fb_file_path.c_str(), O_RDWR)) < 0) {
    ALOGE("Failed to open '%s' (%s)", fb_file_path.c_str(), strerror(errno));
    return -errno;
  }

  auto fb_broadcast = FBBroadcastRegionView::GetInstance();
  auto framebuffer = FrameBufferRegionView::GetInstance();

  /*
   * MAP the framebuffer
   */
  module->framebuffer = new private_handle_t(
      fd, framebuffer->total_buffer_size(), HAL_PIXEL_FORMAT_RGBX_8888,
      fb_broadcast->x_res(), fb_broadcast->y_res(),
      fb_broadcast->line_length() / fb_broadcast->bytes_per_pixel(),
      private_handle_t::PRIV_FLAGS_FRAMEBUFFER);
  reference_region("framebuffer_init", module->framebuffer);

  return 0;
}


/*****************************************************************************/

static int fb_close(struct hw_device_t *dev) {
  fb_context_t* ctx = (fb_context_t*)dev;
  if (ctx) {
    free(ctx);
  }
  return 0;
}

int fb_device_open(
    hw_module_t const* module, const char* name, hw_device_t** device) {
  int status = -EINVAL;
  if (!strcmp(name, GRALLOC_HARDWARE_FB0)) {
    /* initialize our state here */
    fb_context_t* dev = (fb_context_t*) malloc(sizeof(*dev));
    LOG_FATAL_IF(!dev, "%s: malloc returned NULL.", __FUNCTION__);
    memset(dev, 0, sizeof(*dev));

    /* initialize the procs */
    dev->device.common.tag = HARDWARE_DEVICE_TAG;
    dev->device.common.version = 0;
    dev->device.common.module = const_cast<hw_module_t*>(module);
    dev->device.common.close = fb_close;
    dev->device.setSwapInterval = fb_setSwapInterval;
    dev->device.post            = fb_post;
    dev->device.setUpdateRect   = fb_setUpdateRect;

    private_module_t* m = (private_module_t*)module;

    status = initUserspaceFrameBuffer(m);

    auto fb_broadcast = FBBroadcastRegionView::GetInstance();

    if (status >= 0) {
      int stride =
          fb_broadcast->line_length() / fb_broadcast->bytes_per_pixel();
      int format = HAL_PIXEL_FORMAT_RGBX_8888;
      const_cast<uint32_t&>(dev->device.flags) = 0;
      const_cast<uint32_t&>(dev->device.width) = fb_broadcast->x_res();
      const_cast<uint32_t&>(dev->device.height) = fb_broadcast->y_res();
      const_cast<int&>(dev->device.stride) = stride;
      const_cast<int&>(dev->device.format) = format;
      const_cast<float&>(dev->device.xdpi) = fb_broadcast->dpi();
      const_cast<float&>(dev->device.ydpi) = fb_broadcast->dpi();
      const_cast<float&>(dev->device.fps) =
          (fb_broadcast->refresh_rate_hz() * 1000) / 1000.0f;
      const_cast<int&>(dev->device.minSwapInterval) = 1;
      const_cast<int&>(dev->device.maxSwapInterval) = 1;
      *device = &dev->device.common;
    }
  }
  return status;
}