From b0a79b3512dd3e142bc5d2fcd5fac7438997c49f Mon Sep 17 00:00:00 2001
From: Chia-I Wu <olv@lunarg.com>
Date: Mon, 11 Oct 2010 16:06:47 +0800
Subject: android: Add DRM-based gralloc.

---
 src/gralloc/gralloc_gem.c | 119 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 119 insertions(+)
 create mode 100644 src/gralloc/gralloc_gem.c

(limited to 'src/gralloc/gralloc_gem.c')

diff --git a/src/gralloc/gralloc_gem.c b/src/gralloc/gralloc_gem.c
new file mode 100644
index 0000000000..a3df97f89b
--- /dev/null
+++ b/src/gralloc/gralloc_gem.c
@@ -0,0 +1,119 @@
+#define LOG_TAG "GRALLOC-GEM"
+
+#include <cutils/log.h>
+#include <cutils/atomic.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#include "gralloc_mod.h"
+#include "gralloc_gem.h"
+
+#define unlikely(x) __builtin_expect(!!(x), 0)
+
+#define DRM_PATH "/dev/dri/card0"
+
+static int32_t drm_gem_pid = 0;
+
+static int
+drm_gem_get_pid(void)
+{
+   if (unlikely(!drm_gem_pid))
+      android_atomic_write((int32_t) getpid(), &drm_gem_pid);
+   return drm_gem_pid;
+}
+
+static int
+drm_gem_init_locked(struct drm_module_t *drm)
+{
+   int ret;
+
+   if (drm->fd >= 0)
+      return 0;
+
+   drm->fd = open(DRM_PATH, O_RDWR);
+   if (drm->fd < 0) {
+      LOGE("failed to open %s", DRM_PATH);
+      return -EINVAL;
+   }
+
+   return 0;
+}
+
+int
+drm_gem_init(struct drm_module_t *drm)
+{
+   int ret;
+
+   pthread_mutex_lock(&drm->mutex);
+   ret = drm_gem_init_locked(drm);
+   pthread_mutex_unlock(&drm->mutex);
+
+   return ret;
+}
+
+int
+drm_gem_get_magic(struct drm_module_t *drm, int32_t *magic)
+{
+   int ret;
+
+   ret = drm_gem_init(drm);
+   if (ret)
+      return ret;
+
+   return drmGetMagic(drm->fd, (drm_magic_t *) magic);
+}
+
+int
+drm_gem_auth_magic(struct drm_module_t *drm, int32_t magic)
+{
+   int ret;
+
+   ret = drm_gem_init(drm);
+   if (ret)
+      return ret;
+
+   return drmAuthMagic(drm->fd, (drm_magic_t) magic);
+}
+
+struct drm_bo_t *
+drm_gem_create_bo(int width, int height, int format, int usage)
+{
+   struct drm_bo_t *bo;
+
+   bo = calloc(1, sizeof(*bo));
+   if (!bo)
+      return NULL;
+
+   bo->base.version = sizeof(bo->base);
+   bo->base.numInts = DRM_HANDLE_NUM_INTS;
+   bo->base.numFds = DRM_HANDLE_NUM_FDS;
+
+   bo->magic = DRM_HANDLE_MAGIC;
+
+   bo->width = width;
+   bo->height = height;
+   bo->format = format;
+   bo->usage = usage;
+
+   bo->pid = drm_gem_get_pid();
+
+   return bo;
+}
+
+struct drm_bo_t *
+drm_gem_validate(buffer_handle_t handle)
+{
+   struct drm_bo_t *bo = drm_gem_get(handle);
+
+   if (bo && unlikely(bo->pid != drm_gem_pid)) {
+      bo->pid = drm_gem_get_pid();
+      bo->fb_handle = 0;
+      bo->fb_id = 0;
+      bo->data = 0;
+   }
+
+   return bo;
+}
-- 
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