drm_getcap is added with another parameter called
DRM_CAP_DUMB_SIZE_AVAILABLE to get the available size
for dumb buffer from drm driver.
Signed-off-by: Ramalingam C <ramalingam.c@xxxxxxxxx>
---
drivers/gpu/drm/drm_ioctl.c | 5 +++++
include/drm/drm_drv.h | 15 +++++++++++++++
include/uapi/drm/drm.h | 1 +
3 files changed, 21 insertions(+)
diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
index 5afb39688b55..786d23f8c03a 100644
--- a/drivers/gpu/drm/drm_ioctl.c
+++ b/drivers/gpu/drm/drm_ioctl.c
@@ -302,6 +302,11 @@ static int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_
case DRM_CAP_CRTC_IN_VBLANK_EVENT:
req->value = 1;
break;
+ case DRM_CAP_DUMB_SIZE_AVAILABLE:
+ if (dev->driver->dumb_size_available)
+ return dev->driver->dumb_size_available(file_priv, dev,
+ &req->value);
+ break;
default:
return -EINVAL;
}
diff --git a/include/drm/drm_drv.h b/include/drm/drm_drv.h
index cf13470810a5..19404e604c03 100644
--- a/include/drm/drm_drv.h
+++ b/include/drm/drm_drv.h
@@ -677,6 +677,21 @@ struct drm_driver {
int (*dumb_create)(struct drm_file *file_priv,
struct drm_device *dev,
struct drm_mode_create_dumb *args);
+
+ /**
+ * @dumb_size_available:
+ *
+ * This function calculates the available backin store for the
+ * dumb buffer that can be created through dumb_create ioctl.
+ *
+ * Returns:
+ *
+ * Zero on success, negative errno on failure.
+ */
+ int (*dumb_size_available)(struct drm_file *file_priv,
+ struct drm_device *dev,
+ uint64_t *avail_size);
+
/**
* @dumb_map_offset:
*
diff --git a/include/uapi/drm/drm.h b/include/uapi/drm/drm.h
index 868bf7996c0f..4da8ebc5aee2 100644
--- a/include/uapi/drm/drm.h
+++ b/include/uapi/drm/drm.h
@@ -651,6 +651,7 @@ struct drm_gem_open {
#define DRM_CAP_CRTC_IN_VBLANK_EVENT 0x12
#define DRM_CAP_SYNCOBJ 0x13
#define DRM_CAP_SYNCOBJ_TIMELINE 0x14
+#define DRM_CAP_DUMB_SIZE_AVAILABLE 0x15
/** DRM_IOCTL_GET_CAP ioctl argument type */
struct drm_get_cap {
--
2.20.1
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