From e6d4594481a2c7d9625d1f4abf898cd461c30c42 Mon Sep 17 00:00:00 2001
From: Grigory Kletsko <grigory.kletsko@cogentembedded.com>
Date: Wed, 2 Nov 2016 16:17:16 +0300
Subject: [PATCH] Add gbm_bo_get_fd() function

---
 backend_kms.c |  8 ++++++++
 gbm.c         | 15 +++++++++++++++
 gbm.h         |  3 +++
 gbmint.h      |  1 +
 4 files changed, 27 insertions(+)

diff --git a/backend_kms.c b/backend_kms.c
index cfee3b0..3fc1d66 100644
--- a/backend_kms.c
+++ b/backend_kms.c
@@ -339,6 +339,13 @@ static int gbm_kms_surface_has_free_buffers(struct gbm_surface *_surface)
 	return ((!surface->bo[0]->locked) || (!surface->bo[1]->locked));
 }
 
+static int gbm_kms_bo_get_fd(struct gbm_bo *_bo)
+{
+	struct gbm_kms_bo *bo = (struct gbm_kms_bo*)_bo;
+
+	return bo->fd;
+}
+
 struct gbm_device kms_gbm_device = {
 	.name = "kms",
 
@@ -349,6 +356,7 @@ struct gbm_device kms_gbm_device = {
 	.bo_import = gbm_kms_bo_import,
 	.bo_write = gbm_kms_bo_write,
 	.bo_destroy = gbm_kms_bo_destroy,
+	.bo_get_fd = gbm_kms_bo_get_fd,
 
 	.surface_create = gbm_kms_surface_create,
 	.surface_lock_front_buffer = gbm_kms_surface_lock_front_buffer,
diff --git a/gbm.c b/gbm.c
index c58576d..458fac0 100644
--- a/gbm.c
+++ b/gbm.c
@@ -470,3 +470,18 @@ gbm_surface_has_free_buffers(struct gbm_surface *surf)
 {
    return surf->gbm->surface_has_free_buffers(surf);
 }
+
+/** Get a DMA-BUF file descriptor for the buffer object
+ *
+ * This function creates a DMA-BUF (also known as PRIME) file descriptor
+ * handle for the buffer object.  Eeach call to gbm_bo_get_fd() returns a new
+ * file descriptor and the caller is responsible for closing the file
+ * descriptor.
+ * \param bo The buffer object
+ * \return Returns a file descriptor referring  to the underlying buffer
+ */
+GBM_EXPORT int
+gbm_bo_get_fd(struct gbm_bo *bo)
+{
+   return bo->gbm->bo_get_fd(bo);
+}
diff --git a/gbm.h b/gbm.h
index 9d2a030..ad92935 100644
--- a/gbm.h
+++ b/gbm.h
@@ -285,6 +285,9 @@ gbm_surface_has_free_buffers(struct gbm_surface *surface);
 void
 gbm_surface_destroy(struct gbm_surface *surface);
 
+int
+gbm_bo_get_fd(struct gbm_bo *bo);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/gbmint.h b/gbmint.h
index a467bea..70a8d4a 100644
--- a/gbmint.h
+++ b/gbmint.h
@@ -70,6 +70,7 @@ struct gbm_device {
                                void *buffer, uint32_t usage);
    int (*bo_write)(struct gbm_bo *bo, const void *buf, size_t data);
    void (*bo_destroy)(struct gbm_bo *bo);
+   int (*bo_get_fd)(struct gbm_bo *_bo);
 
    struct gbm_surface *(*surface_create)(struct gbm_device *gbm,
                                          uint32_t width, uint32_t height,
-- 
2.7.4