From: CK Hu <[email protected]>
Add an interface to allocate MediaTek GEM buffers, allow the IOCTLs
to be used by render nodes.
This patch also sets the RENDER driver feature.
Signed-off-by: CK Hu <[email protected]>
Signed-off-by: Nicolas Boichat <[email protected]>
Signed-off-by: Philipp Zabel <[email protected]>
Signed-off-by: Jason-JH.Lin <[email protected]>
Reviewed-by: Daniel Kurtz <[email protected]>
Reviewed-by: Nicolas Boichat <[email protected]>
Tested-by: Daniel Kurtz <[email protected]>
Tested-by: Pi-Hsun Shih <[email protected]>
---
drivers/gpu/drm/mediatek/mtk_drm_drv.c | 13 ++++++
drivers/gpu/drm/mediatek/mtk_drm_gem.c | 39 +++++++++++++++++
drivers/gpu/drm/mediatek/mtk_drm_gem.h | 12 ++++++
include/uapi/drm/mediatek_drm.h | 58 ++++++++++++++++++++++++++
4 files changed, 122 insertions(+)
create mode 100644 include/uapi/drm/mediatek_drm.h
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
index 2b0c35cacbc6..5d2a39e491aa 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
@@ -24,6 +24,7 @@
#include <drm/drm_of.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_vblank.h>
+#include <drm/mediatek_drm.h>
#include "mtk_drm_crtc.h"
#include "mtk_drm_ddp_comp.h"
@@ -569,6 +570,14 @@ static void mtk_drm_kms_deinit(struct drm_device *drm)
component_unbind_all(drm->dev, drm);
}
+static const struct drm_ioctl_desc mtk_ioctls[] = {
+ DRM_IOCTL_DEF_DRV(MTK_GEM_CREATE, mtk_gem_create_ioctl,
+ DRM_UNLOCKED | DRM_AUTH | DRM_RENDER_ALLOW),
+ DRM_IOCTL_DEF_DRV(MTK_GEM_MAP_OFFSET,
+ mtk_gem_map_offset_ioctl,
+ DRM_UNLOCKED | DRM_AUTH | DRM_RENDER_ALLOW),
+};
+
DEFINE_DRM_GEM_FOPS(mtk_drm_fops);
/*
@@ -590,6 +599,10 @@ static const struct drm_driver mtk_drm_driver = {
.gem_prime_import = mtk_drm_gem_prime_import,
.gem_prime_import_sg_table = mtk_gem_prime_import_sg_table,
+
+ .ioctls = mtk_ioctls,
+ .num_ioctls = ARRAY_SIZE(mtk_ioctls),
+
.fops = &mtk_drm_fops,
.name = DRIVER_NAME,
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_gem.c b/drivers/gpu/drm/mediatek/mtk_drm_gem.c
index 4f2e3feabc0f..30e347adcbe9 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_gem.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_gem.c
@@ -4,6 +4,7 @@
*/
#include <linux/dma-buf.h>
+#include <drm/mediatek_drm.h>
#include <drm/drm.h>
#include <drm/drm_device.h>
@@ -283,3 +284,41 @@ void mtk_drm_gem_prime_vunmap(struct drm_gem_object *obj,
mtk_gem->kvaddr = NULL;
kfree(mtk_gem->pages);
}
+
+int mtk_gem_map_offset_ioctl(struct drm_device *drm, void *data,
+ struct drm_file *file_priv)
+{
+ struct drm_mtk_gem_map_off *args = data;
+
+ return drm_gem_dumb_map_offset(file_priv, drm, args->handle,
+ &args->offset);
+}
+
+int mtk_gem_create_ioctl(struct drm_device *dev, void *data,
+ struct drm_file *file_priv)
+{
+ struct mtk_drm_gem_obj *mtk_gem;
+ struct drm_mtk_gem_create *args = data;
+ int ret;
+
+ mtk_gem = mtk_drm_gem_create(dev, args->size, false);
+ if (IS_ERR(mtk_gem))
+ return PTR_ERR(mtk_gem);
+
+ /*
+ * allocate a id of idr table where the obj is registered
+ * and handle has the id what user can see.
+ */
+ ret = drm_gem_handle_create(file_priv, &mtk_gem->base, &args->handle);
+ if (ret)
+ goto err_handle_create;
+
+ /* drop reference from allocate - handle holds it now. */
+ drm_gem_object_put(&mtk_gem->base);
+
+ return 0;
+
+err_handle_create:
+ mtk_drm_gem_free_object(&mtk_gem->base);
+ return ret;
+}
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_gem.h b/drivers/gpu/drm/mediatek/mtk_drm_gem.h
index 78f23b07a02e..90f3d2916ec5 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_gem.h
+++ b/drivers/gpu/drm/mediatek/mtk_drm_gem.h
@@ -46,4 +46,16 @@ int mtk_drm_gem_prime_vmap(struct drm_gem_object *obj, struct iosys_map *map);
void mtk_drm_gem_prime_vunmap(struct drm_gem_object *obj,
struct iosys_map *map);
+/*
+ * request gem object creation and buffer allocation as the size
+ * that it is calculated with framebuffer information such as width,
+ * height and bpp.
+ */
+int mtk_gem_create_ioctl(struct drm_device *dev, void *data,
+ struct drm_file *file_priv);
+
+/* get buffer offset to map to user space. */
+int mtk_gem_map_offset_ioctl(struct drm_device *dev, void *data,
+ struct drm_file *file_priv);
+
#endif
diff --git a/include/uapi/drm/mediatek_drm.h b/include/uapi/drm/mediatek_drm.h
new file mode 100644
index 000000000000..f4d47577c94e
--- /dev/null
+++ b/include/uapi/drm/mediatek_drm.h
@@ -0,0 +1,58 @@
+/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
+/*
+ * Copyright (c) 2015 MediaTek Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef _UAPI_MEDIATEK_DRM_H
+#define _UAPI_MEDIATEK_DRM_H
+
+#include <drm/drm.h>
+
+/**
+ * struct drm_mtk_gem_create - User-desired buffer creation information structure.
+ *
+ * @size: user-desired memory allocation size.
+ * - this size value would be page-aligned internally.
+ * @flags: user request for setting memory type or cache attributes.
+ * @handle: returned a handle to created gem object.
+ * - this handle will be set by gem module of kernel side.
+ */
+struct drm_mtk_gem_create {
+ uint64_t size;
+ uint32_t flags;
+ uint32_t handle;
+};
+
+/**
+ * struct drm_mtk_gem_map_off - A structure for getting buffer offset.
+ *
+ * @handle: a pointer to gem object created.
+ * @pad: just padding to be 64-bit aligned.
+ * @offset: relatived offset value of the memory region allocated.
+ * - this value should be set by user.
+ */
+struct drm_mtk_gem_map_off {
+ uint32_t handle;
+ uint32_t pad;
+ uint64_t offset;
+};
+
+#define DRM_MTK_GEM_CREATE 0x00
+#define DRM_MTK_GEM_MAP_OFFSET 0x01
+
+#define DRM_IOCTL_MTK_GEM_CREATE DRM_IOWR(DRM_COMMAND_BASE + \
+ DRM_MTK_GEM_CREATE, struct drm_mtk_gem_create)
+
+#define DRM_IOCTL_MTK_GEM_MAP_OFFSET DRM_IOWR(DRM_COMMAND_BASE + \
+ DRM_MTK_GEM_MAP_OFFSET, struct drm_mtk_gem_map_off)
+
+#endif /* _UAPI_MEDIATEK_DRM_H */
--
2.18.0
Hi, Jason:
On Sun, 2023-12-24 at 02:29 +0800, Jason-JH.Lin wrote:
> From: CK Hu <[email protected]>
>
> Add an interface to allocate MediaTek GEM buffers, allow the IOCTLs
> to be used by render nodes.
> This patch also sets the RENDER driver feature.
>
> Signed-off-by: CK Hu <[email protected]>
> Signed-off-by: Nicolas Boichat <[email protected]>
> Signed-off-by: Philipp Zabel <[email protected]>
> Signed-off-by: Jason-JH.Lin <[email protected]>
> Reviewed-by: Daniel Kurtz <[email protected]>
> Reviewed-by: Nicolas Boichat <[email protected]>
> Tested-by: Daniel Kurtz <[email protected]>
> Tested-by: Pi-Hsun Shih <[email protected]>
> ---
> drivers/gpu/drm/mediatek/mtk_drm_drv.c | 13 ++++++
> drivers/gpu/drm/mediatek/mtk_drm_gem.c | 39 +++++++++++++++++
> drivers/gpu/drm/mediatek/mtk_drm_gem.h | 12 ++++++
> include/uapi/drm/mediatek_drm.h | 58
> ++++++++++++++++++++++++++
> 4 files changed, 122 insertions(+)
> create mode 100644 include/uapi/drm/mediatek_drm.h
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> index 2b0c35cacbc6..5d2a39e491aa 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> @@ -24,6 +24,7 @@
> #include <drm/drm_of.h>
> #include <drm/drm_probe_helper.h>
> #include <drm/drm_vblank.h>
> +#include <drm/mediatek_drm.h>
>
> #include "mtk_drm_crtc.h"
> #include "mtk_drm_ddp_comp.h"
> @@ -569,6 +570,14 @@ static void mtk_drm_kms_deinit(struct drm_device
> *drm)
> component_unbind_all(drm->dev, drm);
> }
>
> +static const struct drm_ioctl_desc mtk_ioctls[] = {
> + DRM_IOCTL_DEF_DRV(MTK_GEM_CREATE, mtk_gem_create_ioctl,
> + DRM_UNLOCKED | DRM_AUTH | DRM_RENDER_ALLOW),
> + DRM_IOCTL_DEF_DRV(MTK_GEM_MAP_OFFSET,
> + mtk_gem_map_offset_ioctl,
> + DRM_UNLOCKED | DRM_AUTH | DRM_RENDER_ALLOW),
For secure buffer, we don't need map offset function. If you really
need this function, separate this to another patch and describe why
need this.
Regards,
CK
> +};
> +
> DEFINE_DRM_GEM_FOPS(mtk_drm_fops);
>
> /*
> @@ -590,6 +599,10 @@ static const struct drm_driver mtk_drm_driver =
> {
>
> .gem_prime_import = mtk_drm_gem_prime_import,
> .gem_prime_import_sg_table = mtk_gem_prime_import_sg_table,
> +
> + .ioctls = mtk_ioctls,
> + .num_ioctls = ARRAY_SIZE(mtk_ioctls),
> +
> .fops = &mtk_drm_fops,
>
> .name = DRIVER_NAME,
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_gem.c
> b/drivers/gpu/drm/mediatek/mtk_drm_gem.c
> index 4f2e3feabc0f..30e347adcbe9 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_gem.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_gem.c
> @@ -4,6 +4,7 @@
> */
>
> #include <linux/dma-buf.h>
> +#include <drm/mediatek_drm.h>
>
> #include <drm/drm.h>
> #include <drm/drm_device.h>
> @@ -283,3 +284,41 @@ void mtk_drm_gem_prime_vunmap(struct
> drm_gem_object *obj,
> mtk_gem->kvaddr = NULL;
> kfree(mtk_gem->pages);
> }
> +
> +int mtk_gem_map_offset_ioctl(struct drm_device *drm, void *data,
> + struct drm_file *file_priv)
> +{
> + struct drm_mtk_gem_map_off *args = data;
> +
> + return drm_gem_dumb_map_offset(file_priv, drm, args->handle,
> + &args->offset);
> +}
> +
> +int mtk_gem_create_ioctl(struct drm_device *dev, void *data,
> + struct drm_file *file_priv)
> +{
> + struct mtk_drm_gem_obj *mtk_gem;
> + struct drm_mtk_gem_create *args = data;
> + int ret;
> +
> + mtk_gem = mtk_drm_gem_create(dev, args->size, false);
> + if (IS_ERR(mtk_gem))
> + return PTR_ERR(mtk_gem);
> +
> + /*
> + * allocate a id of idr table where the obj is registered
> + * and handle has the id what user can see.
> + */
> + ret = drm_gem_handle_create(file_priv, &mtk_gem->base, &args-
> >handle);
> + if (ret)
> + goto err_handle_create;
> +
> + /* drop reference from allocate - handle holds it now. */
> + drm_gem_object_put(&mtk_gem->base);
> +
> + return 0;
> +
> +err_handle_create:
> + mtk_drm_gem_free_object(&mtk_gem->base);
> + return ret;
> +}
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_gem.h
> b/drivers/gpu/drm/mediatek/mtk_drm_gem.h
> index 78f23b07a02e..90f3d2916ec5 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_gem.h
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_gem.h
> @@ -46,4 +46,16 @@ int mtk_drm_gem_prime_vmap(struct drm_gem_object
> *obj, struct iosys_map *map);
> void mtk_drm_gem_prime_vunmap(struct drm_gem_object *obj,
> struct iosys_map *map);
>
> +/*
> + * request gem object creation and buffer allocation as the size
> + * that it is calculated with framebuffer information such as width,
> + * height and bpp.
> + */
> +int mtk_gem_create_ioctl(struct drm_device *dev, void *data,
> + struct drm_file *file_priv);
> +
> +/* get buffer offset to map to user space. */
> +int mtk_gem_map_offset_ioctl(struct drm_device *dev, void *data,
> + struct drm_file *file_priv);
> +
> #endif
> diff --git a/include/uapi/drm/mediatek_drm.h
> b/include/uapi/drm/mediatek_drm.h
> new file mode 100644
> index 000000000000..f4d47577c94e
> --- /dev/null
> +++ b/include/uapi/drm/mediatek_drm.h
> @@ -0,0 +1,58 @@
> +/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
> +/*
> + * Copyright (c) 2015 MediaTek Inc.
> + *
> + * This program is free software; you can redistribute it and/or
> modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#ifndef _UAPI_MEDIATEK_DRM_H
> +#define _UAPI_MEDIATEK_DRM_H
> +
> +#include <drm/drm.h>
> +
> +/**
> + * struct drm_mtk_gem_create - User-desired buffer creation
> information structure.
> + *
> + * @size: user-desired memory allocation size.
> + * - this size value would be page-aligned internally.
> + * @flags: user request for setting memory type or cache attributes.
> + * @handle: returned a handle to created gem object.
> + * - this handle will be set by gem module of kernel side.
> + */
> +struct drm_mtk_gem_create {
> + uint64_t size;
> + uint32_t flags;
> + uint32_t handle;
> +};
> +
> +/**
> + * struct drm_mtk_gem_map_off - A structure for getting buffer
> offset.
> + *
> + * @handle: a pointer to gem object created.
> + * @pad: just padding to be 64-bit aligned.
> + * @offset: relatived offset value of the memory region allocated.
> + * - this value should be set by user.
> + */
> +struct drm_mtk_gem_map_off {
> + uint32_t handle;
> + uint32_t pad;
> + uint64_t offset;
> +};
> +
> +#define DRM_MTK_GEM_CREATE 0x00
> +#define DRM_MTK_GEM_MAP_OFFSET 0x01
> +
> +#define DRM_IOCTL_MTK_GEM_CREATE DRM_IOWR(DRM_COMMAND_BASE + \
> + DRM_MTK_GEM_CREATE, struct drm_mtk_gem_create)
> +
> +#define DRM_IOCTL_MTK_GEM_MAP_OFFSET DRM_IOWR(DRM_COMMAND_BASE + \
> + DRM_MTK_GEM_MAP_OFFSET, struct drm_mtk_gem_map_off)
> +
> +#endif /* _UAPI_MEDIATEK_DRM_H */
Hi CK,
Thanks for the reviews.
On Mon, 2023-12-25 at 09:05 +0000, CK Hu (胡俊光) wrote:
> Hi, Jason:
>
>
> On Sun, 2023-12-24 at 02:29 +0800, Jason-JH.Lin wrote:
> > From: CK Hu <[email protected]>
> >
> > Add an interface to allocate MediaTek GEM buffers, allow the IOCTLs
> > to be used by render nodes.
> > This patch also sets the RENDER driver feature.
> >
> > Signed-off-by: CK Hu <[email protected]>
> > Signed-off-by: Nicolas Boichat <[email protected]>
> > Signed-off-by: Philipp Zabel <[email protected]>
> > Signed-off-by: Jason-JH.Lin <[email protected]>
> > Reviewed-by: Daniel Kurtz <[email protected]>
> > Reviewed-by: Nicolas Boichat <[email protected]>
> > Tested-by: Daniel Kurtz <[email protected]>
> > Tested-by: Pi-Hsun Shih <[email protected]>
> > ---
> > drivers/gpu/drm/mediatek/mtk_drm_drv.c | 13 ++++++
> > drivers/gpu/drm/mediatek/mtk_drm_gem.c | 39 +++++++++++++++++
> > drivers/gpu/drm/mediatek/mtk_drm_gem.h | 12 ++++++
> > include/uapi/drm/mediatek_drm.h | 58
> > ++++++++++++++++++++++++++
> > 4 files changed, 122 insertions(+)
> > create mode 100644 include/uapi/drm/mediatek_drm.h
> >
> > diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> > b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> > index 2b0c35cacbc6..5d2a39e491aa 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> > @@ -24,6 +24,7 @@
> > #include <drm/drm_of.h>
> > #include <drm/drm_probe_helper.h>
> > #include <drm/drm_vblank.h>
> > +#include <drm/mediatek_drm.h>
> >
> > #include "mtk_drm_crtc.h"
> > #include "mtk_drm_ddp_comp.h"
> > @@ -569,6 +570,14 @@ static void mtk_drm_kms_deinit(struct
> > drm_device
> > *drm)
> > component_unbind_all(drm->dev, drm);
> > }
> >
> > +static const struct drm_ioctl_desc mtk_ioctls[] = {
> > + DRM_IOCTL_DEF_DRV(MTK_GEM_CREATE, mtk_gem_create_ioctl,
> > + DRM_UNLOCKED | DRM_AUTH | DRM_RENDER_ALLOW),
> > + DRM_IOCTL_DEF_DRV(MTK_GEM_MAP_OFFSET,
> > + mtk_gem_map_offset_ioctl,
> > + DRM_UNLOCKED | DRM_AUTH | DRM_RENDER_ALLOW),
>
> For secure buffer, we don't need map offset function. If you really
> need this function, separate this to another patch and describe why
> need this.
>
> Regards,
> CK
OK, I'll remove this function.
Regards
Jason-JH.Lin
>
> > +};
> > +
> > DEFINE_DRM_GEM_FOPS(mtk_drm_fops);
> >
> > /*
> > @@ -590,6 +599,10 @@ static const struct drm_driver mtk_drm_driver
> > =
> > {
> >
> > .gem_prime_import = mtk_drm_gem_prime_import,
> > .gem_prime_import_sg_table = mtk_gem_prime_import_sg_table,
> > +
> > + .ioctls = mtk_ioctls,
> > + .num_ioctls = ARRAY_SIZE(mtk_ioctls),
> > +
> > .fops = &mtk_drm_fops,
> >
> > .name = DRIVER_NAME,
> > diff --git a/drivers/gpu/drm/mediatek/mtk_drm_gem.c
> > b/drivers/gpu/drm/mediatek/mtk_drm_gem.c
> > index 4f2e3feabc0f..30e347adcbe9 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_drm_gem.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_drm_gem.c
> > @@ -4,6 +4,7 @@
> > */
> >
> > #include <linux/dma-buf.h>
> > +#include <drm/mediatek_drm.h>
> >
> > #include <drm/drm.h>
> > #include <drm/drm_device.h>
> > @@ -283,3 +284,41 @@ void mtk_drm_gem_prime_vunmap(struct
> > drm_gem_object *obj,
> > mtk_gem->kvaddr = NULL;
> > kfree(mtk_gem->pages);
> > }
> > +
> > +int mtk_gem_map_offset_ioctl(struct drm_device *drm, void *data,
> > + struct drm_file *file_priv)
> > +{
> > + struct drm_mtk_gem_map_off *args = data;
> > +
> > + return drm_gem_dumb_map_offset(file_priv, drm, args->handle,
> > + &args->offset);
> > +}
> > +
> > +int mtk_gem_create_ioctl(struct drm_device *dev, void *data,
> > + struct drm_file *file_priv)
> > +{
> > + struct mtk_drm_gem_obj *mtk_gem;
> > + struct drm_mtk_gem_create *args = data;
> > + int ret;
> > +
> > + mtk_gem = mtk_drm_gem_create(dev, args->size, false);
> > + if (IS_ERR(mtk_gem))
> > + return PTR_ERR(mtk_gem);
> > +
> > + /*
> > + * allocate a id of idr table where the obj is registered
> > + * and handle has the id what user can see.
> > + */
> > + ret = drm_gem_handle_create(file_priv, &mtk_gem->base, &args-
> > > handle);
> >
> > + if (ret)
> > + goto err_handle_create;
> > +
> > + /* drop reference from allocate - handle holds it now. */
> > + drm_gem_object_put(&mtk_gem->base);
> > +
> > + return 0;
> > +
> > +err_handle_create:
> > + mtk_drm_gem_free_object(&mtk_gem->base);
> > + return ret;
> > +}
> > diff --git a/drivers/gpu/drm/mediatek/mtk_drm_gem.h
> > b/drivers/gpu/drm/mediatek/mtk_drm_gem.h
> > index 78f23b07a02e..90f3d2916ec5 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_drm_gem.h
> > +++ b/drivers/gpu/drm/mediatek/mtk_drm_gem.h
> > @@ -46,4 +46,16 @@ int mtk_drm_gem_prime_vmap(struct drm_gem_object
> > *obj, struct iosys_map *map);
> > void mtk_drm_gem_prime_vunmap(struct drm_gem_object *obj,
> > struct iosys_map *map);
> >
> > +/*
> > + * request gem object creation and buffer allocation as the size
> > + * that it is calculated with framebuffer information such as
> > width,
> > + * height and bpp.
> > + */
> > +int mtk_gem_create_ioctl(struct drm_device *dev, void *data,
> > + struct drm_file *file_priv);
> > +
> > +/* get buffer offset to map to user space. */
> > +int mtk_gem_map_offset_ioctl(struct drm_device *dev, void *data,
> > + struct drm_file *file_priv);
> > +
> > #endif
> > diff --git a/include/uapi/drm/mediatek_drm.h
> > b/include/uapi/drm/mediatek_drm.h
> > new file mode 100644
> > index 000000000000..f4d47577c94e
> > --- /dev/null
> > +++ b/include/uapi/drm/mediatek_drm.h
> > @@ -0,0 +1,58 @@
> > +/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
> > +/*
> > + * Copyright (c) 2015 MediaTek Inc.
> > + *
> > + * This program is free software; you can redistribute it and/or
> > modify
> > + * it under the terms of the GNU General Public License version 2
> > as
> > + * published by the Free Software Foundation.
> > + *
> > + * This program is distributed in the hope that it will be useful,
> > + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> > + * GNU General Public License for more details.
> > + */
> > +
> > +#ifndef _UAPI_MEDIATEK_DRM_H
> > +#define _UAPI_MEDIATEK_DRM_H
> > +
> > +#include <drm/drm.h>
> > +
> > +/**
> > + * struct drm_mtk_gem_create - User-desired buffer creation
> > information structure.
> > + *
> > + * @size: user-desired memory allocation size.
> > + * - this size value would be page-aligned internally.
> > + * @flags: user request for setting memory type or cache
> > attributes.
> > + * @handle: returned a handle to created gem object.
> > + * - this handle will be set by gem module of kernel side.
> > + */
> > +struct drm_mtk_gem_create {
> > + uint64_t size;
> > + uint32_t flags;
> > + uint32_t handle;
> > +};
> > +
> > +/**
> > + * struct drm_mtk_gem_map_off - A structure for getting buffer
> > offset.
> > + *
> > + * @handle: a pointer to gem object created.
> > + * @pad: just padding to be 64-bit aligned.
> > + * @offset: relatived offset value of the memory region allocated.
> > + * - this value should be set by user.
> > + */
> > +struct drm_mtk_gem_map_off {
> > + uint32_t handle;
> > + uint32_t pad;
> > + uint64_t offset;
> > +};
> > +
> > +#define DRM_MTK_GEM_CREATE 0x00
> > +#define DRM_MTK_GEM_MAP_OFFSET 0x01
> > +
> > +#define DRM_IOCTL_MTK_GEM_CREATE DRM_IOWR(DRM_COMMAND_BASE + \
> > + DRM_MTK_GEM_CREATE, struct drm_mtk_gem_create)
> > +
> > +#define DRM_IOCTL_MTK_GEM_MAP_OFFSET DRM_IOWR(DRM_COMMAND_BA
> > SE + \
> > + DRM_MTK_GEM_MAP_OFFSET, struct drm_mtk_gem_map_off)
> > +
> > +#endif /* _UAPI_MEDIATEK_DRM_H */