[PATCH] drm/mediatek: mtk_gem: Partial refactor and use drm_gem_dma_object
AngeloGioacchino Del Regno
angelogioacchino.delregno at collabora.com
Tue Nov 11 00:51:14 PST 2025
Partially refactor mtk_gem to stop using (and remove) the unneeded
custom mtk_gem_obj structure and migrate drivers to use the API
defined drm_gem_dma_object structure instead, and to align all of
the functions to be similar to the logic from drm_gem_dma_helper.
Unfortunately, for this driver it wasn't possible to directly use
the drm_gem_dma_helper callbacks (apart from .print_info), as the
DMA mapping here is done on specific dma devices instead of the
main DRM device.
Also, since the mtk_gem_obj structure is no more, also migrate the
mtk_plane.c code to grab the DMA address from a drm_gem_dma_object
and replace the inclusion of the custom mtk_gem.h header (as it is
now unneeded) with the DRM API provided drm_gem_dma_helper.
While at it, also set DRM_GEM_DMA_HELPER as an unconditional
dependency (remove the `if DRM_FBDEV_EMULATION` from the select
DRM_GEM_DMA_HELPER statement in Kconfig).
This resolves an issue pointed by UBSAN, as when using drm_fbdev_dma
the drm_gem_object is supposed to be child of a drm_gem_dma_object
instead of a custom mtk_gem_obj (or the mtk_gem_obj should have been
reordered to have the same fields as drm_gem_dma_object, but that
would have been too fragile and generally a bad idea anyway).
Fixes: 0992284b4fe4 ("drm/mediatek: Use fbdev-dma")
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno at collabora.com>
---
For reference, the UBSAN warning:
[ 7.049322] mediatek-drm mediatek-drm.6.auto: bound 1c110000.merge (ops mtk_disp_merge_component_ops [mediatek_drm])
[ 7.049414] mediatek-drm mediatek-drm.4.auto: Not creating crtc 1 because component 9 is disabled or missing
[ 7.063371] [drm] Initialized mediatek 1.0.0 for mediatek-drm.4.auto on minor 1
[ 7.064544] ------------[ cut here ]------------
[ 7.064552] UBSAN: invalid-load in /build/linux-genio/drivers/gpu/drm/drm_fbdev_dma.c:212:13
[ 7.066759] load of value 20 is not a valid value for type '_Bool'
[ 7.068537] CPU: 6 UID: 0 PID: 444 Comm: kworker/u32:8 Not tainted 6.17.0-next-20251007+ #1187 PREEMPT(full)
[ 7.068543] Hardware name: Acer Tomato (rev2) board (DT)
[ 7.068545] Workqueue: events_unbound deferred_probe_work_func
[ 7.068555] Call trace:
[ 7.068557] show_stack+0x34/0xd8 (C)
[ 7.068564] dump_stack_lvl+0x80/0xc0
[ 7.068568] dump_stack+0x1c/0x40
[ 7.068571] ubsan_epilogue+0x14/0x60
[ 7.068575] __ubsan_handle_load_invalid_value+0xb8/0xe0
[ 7.068579] drm_fbdev_dma_driver_fbdev_probe_tail.isra.0+0x1d0/0x1f0 [drm_dma_helper]
[ 7.068588] drm_fbdev_dma_driver_fbdev_probe+0x20c/0x2a0 [drm_dma_helper]
[ 7.068591] drm_fb_helper_single_fb_probe+0xbc/0x220
[ 7.068595] __drm_fb_helper_initial_config_and_unlock+0x3c/0x170
[ 7.068597] drm_fb_helper_initial_config+0x4c/0x98
[ 7.068599] drm_fbdev_client_hotplug+0x9c/0x100
[ 7.068603] drm_client_register+0x64/0xd0
[ 7.068605] drm_fbdev_client_setup+0xf8/0x260
[ 7.068608] drm_client_setup+0xfc/0x130
[ 7.068610] mtk_drm_bind+0x110/0x218 [mediatek_drm]
[ 7.068622] try_to_bring_up_aggregate_device+0xcc/0x1b0
[ 7.068625] __component_add+0x12c/0x218
[ 7.068627] component_add+0x20/0x48
[ 7.068629] mtk_disp_rdma_probe+0x1b0/0x308 [mediatek_drm]
[ 7.068635] platform_probe+0x70/0x128
[ 7.068638] really_probe+0xd8/0x3e8
[ 7.068640] __driver_probe_device+0x94/0x1a8
[ 7.068642] driver_probe_device+0x4c/0x1a0
[ 7.068644] __device_attach_driver+0x10c/0x238
[ 7.068645] bus_for_each_drv+0x94/0x120
[ 7.068647] __device_attach+0xa8/0x210
[ 7.068648] device_initial_probe+0x20/0x50
[ 7.068650] bus_probe_device+0xc0/0xd8
[ 7.068652] deferred_probe_work_func+0xac/0x120
[ 7.068654] process_one_work+0x174/0x428
[ 7.068658] worker_thread+0x310/0x440
[ 7.068661] kthread+0x110/0x130
[ 7.068663] ret_from_fork+0x10/0x20
[ 7.068667] ---[ end trace ]---
drivers/gpu/drm/mediatek/Kconfig | 2 +-
drivers/gpu/drm/mediatek/mtk_gem.c | 267 +++++++++++----------------
drivers/gpu/drm/mediatek/mtk_gem.h | 33 +---
drivers/gpu/drm/mediatek/mtk_plane.c | 8 +-
4 files changed, 110 insertions(+), 200 deletions(-)
diff --git a/drivers/gpu/drm/mediatek/Kconfig b/drivers/gpu/drm/mediatek/Kconfig
index e47debd60619..5bd024fcbfa1 100644
--- a/drivers/gpu/drm/mediatek/Kconfig
+++ b/drivers/gpu/drm/mediatek/Kconfig
@@ -8,7 +8,7 @@ config DRM_MEDIATEK
depends on OF
depends on MTK_MMSYS
select DRM_CLIENT_SELECTION
- select DRM_GEM_DMA_HELPER if DRM_FBDEV_EMULATION
+ select DRM_GEM_DMA_HELPER
select DRM_KMS_HELPER
select DRM_DISPLAY_HELPER
select DRM_BRIDGE_CONNECTOR
diff --git a/drivers/gpu/drm/mediatek/mtk_gem.c b/drivers/gpu/drm/mediatek/mtk_gem.c
index a172456d1d7b..c19844bb2fde 100644
--- a/drivers/gpu/drm/mediatek/mtk_gem.c
+++ b/drivers/gpu/drm/mediatek/mtk_gem.c
@@ -1,6 +1,8 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2015 MediaTek Inc.
+ * Copyright (c) 2025 Collabora Ltd.
+ * AngeloGioacchino Del Regno <angelogioacchino.delregno at collabora.com>
*/
#include <linux/dma-buf.h>
@@ -17,24 +19,64 @@
static int mtk_gem_object_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma);
-static const struct vm_operations_struct vm_ops = {
- .open = drm_gem_vm_open,
- .close = drm_gem_vm_close,
-};
+static void mtk_gem_free_object(struct drm_gem_object *obj)
+{
+ struct drm_gem_dma_object *dma_obj = to_drm_gem_dma_obj(obj);
+ struct mtk_drm_private *priv = obj->dev->dev_private;
+
+ if (dma_obj->sgt)
+ drm_prime_gem_destroy(obj, dma_obj->sgt);
+ else
+ dma_free_wc(priv->dma_dev, dma_obj->base.size,
+ dma_obj->vaddr, dma_obj->dma_addr);
+
+ /* release file pointer to gem object. */
+ drm_gem_object_release(obj);
+
+ kfree(dma_obj);
+}
+
+/*
+ * Allocate a sg_table for this GEM object.
+ * Note: Both the table's contents, and the sg_table itself must be freed by
+ * the caller.
+ * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error.
+ */
+static struct sg_table *mtk_gem_prime_get_sg_table(struct drm_gem_object *obj)
+{
+ struct drm_gem_dma_object *dma_obj = to_drm_gem_dma_obj(obj);
+ struct mtk_drm_private *priv = obj->dev->dev_private;
+ struct sg_table *sgt;
+ int ret;
+
+ sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
+ if (!sgt)
+ return ERR_PTR(-ENOMEM);
+
+ ret = dma_get_sgtable(priv->dma_dev, sgt, dma_obj->vaddr,
+ dma_obj->dma_addr, obj->size);
+ if (ret) {
+ DRM_ERROR("failed to allocate sgt, %d\n", ret);
+ kfree(sgt);
+ return ERR_PTR(ret);
+ }
+
+ return sgt;
+}
static const struct drm_gem_object_funcs mtk_gem_object_funcs = {
.free = mtk_gem_free_object,
+ .print_info = drm_gem_dma_object_print_info,
.get_sg_table = mtk_gem_prime_get_sg_table,
- .vmap = mtk_gem_prime_vmap,
- .vunmap = mtk_gem_prime_vunmap,
+ .vmap = drm_gem_dma_object_vmap,
.mmap = mtk_gem_object_mmap,
- .vm_ops = &vm_ops,
+ .vm_ops = &drm_gem_dma_vm_ops,
};
-static struct mtk_gem_obj *mtk_gem_init(struct drm_device *dev,
- unsigned long size)
+static struct drm_gem_dma_object *mtk_gem_init(struct drm_device *dev,
+ unsigned long size, bool private)
{
- struct mtk_gem_obj *mtk_gem_obj;
+ struct drm_gem_dma_object *dma_obj;
int ret;
size = round_up(size, PAGE_SIZE);
@@ -42,86 +84,65 @@ static struct mtk_gem_obj *mtk_gem_init(struct drm_device *dev,
if (size == 0)
return ERR_PTR(-EINVAL);
- mtk_gem_obj = kzalloc(sizeof(*mtk_gem_obj), GFP_KERNEL);
- if (!mtk_gem_obj)
+ dma_obj = kzalloc(sizeof(*dma_obj), GFP_KERNEL);
+ if (!dma_obj)
return ERR_PTR(-ENOMEM);
- mtk_gem_obj->base.funcs = &mtk_gem_object_funcs;
+ dma_obj->base.funcs = &mtk_gem_object_funcs;
- ret = drm_gem_object_init(dev, &mtk_gem_obj->base, size);
- if (ret < 0) {
+ if (private) {
+ ret = 0;
+ drm_gem_private_object_init(dev, &dma_obj->base, size);
+ } else {
+ ret = drm_gem_object_init(dev, &dma_obj->base, size);
+ }
+ if (ret) {
DRM_ERROR("failed to initialize gem object\n");
- kfree(mtk_gem_obj);
+ kfree(dma_obj);
return ERR_PTR(ret);
}
- return mtk_gem_obj;
+ return dma_obj;
}
-struct mtk_gem_obj *mtk_gem_create(struct drm_device *dev,
- size_t size, bool alloc_kmap)
+static struct drm_gem_dma_object *mtk_gem_create(struct drm_device *dev, size_t size)
{
struct mtk_drm_private *priv = dev->dev_private;
- struct mtk_gem_obj *mtk_gem;
+ struct drm_gem_dma_object *dma_obj;
struct drm_gem_object *obj;
int ret;
- mtk_gem = mtk_gem_init(dev, size);
- if (IS_ERR(mtk_gem))
- return ERR_CAST(mtk_gem);
-
- obj = &mtk_gem->base;
-
- mtk_gem->dma_attrs = DMA_ATTR_WRITE_COMBINE;
+ dma_obj = mtk_gem_init(dev, size, false);
+ if (IS_ERR(dma_obj))
+ return ERR_CAST(dma_obj);
- if (!alloc_kmap)
- mtk_gem->dma_attrs |= DMA_ATTR_NO_KERNEL_MAPPING;
+ obj = &dma_obj->base;
- mtk_gem->cookie = dma_alloc_attrs(priv->dma_dev, obj->size,
- &mtk_gem->dma_addr, GFP_KERNEL,
- mtk_gem->dma_attrs);
- if (!mtk_gem->cookie) {
+ dma_obj->vaddr = dma_alloc_wc(priv->dma_dev, obj->size,
+ &dma_obj->dma_addr,
+ GFP_KERNEL | __GFP_NOWARN);
+ if (!dma_obj->vaddr) {
DRM_ERROR("failed to allocate %zx byte dma buffer", obj->size);
ret = -ENOMEM;
goto err_gem_free;
}
- if (alloc_kmap)
- mtk_gem->kvaddr = mtk_gem->cookie;
-
- DRM_DEBUG_DRIVER("cookie = %p dma_addr = %pad size = %zu\n",
- mtk_gem->cookie, &mtk_gem->dma_addr,
+ DRM_DEBUG_DRIVER("vaddr = %p dma_addr = %pad size = %zu\n",
+ dma_obj->vaddr, &dma_obj->dma_addr,
size);
- return mtk_gem;
+ return dma_obj;
err_gem_free:
drm_gem_object_release(obj);
- kfree(mtk_gem);
+ kfree(dma_obj);
return ERR_PTR(ret);
}
-void mtk_gem_free_object(struct drm_gem_object *obj)
-{
- struct mtk_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
- struct mtk_drm_private *priv = obj->dev->dev_private;
-
- if (mtk_gem->sg)
- drm_prime_gem_destroy(obj, mtk_gem->sg);
- else
- dma_free_attrs(priv->dma_dev, obj->size, mtk_gem->cookie,
- mtk_gem->dma_addr, mtk_gem->dma_attrs);
-
- /* release file pointer to gem object. */
- drm_gem_object_release(obj);
-
- kfree(mtk_gem);
-}
-
int mtk_gem_dumb_create(struct drm_file *file_priv, struct drm_device *dev,
struct drm_mode_create_dumb *args)
{
- struct mtk_gem_obj *mtk_gem;
+ struct drm_gem_dma_object *dma_obj;
int ret;
args->pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
@@ -134,25 +155,24 @@ int mtk_gem_dumb_create(struct drm_file *file_priv, struct drm_device *dev,
args->size = args->pitch;
args->size *= args->height;
- mtk_gem = mtk_gem_create(dev, args->size, false);
- if (IS_ERR(mtk_gem))
- return PTR_ERR(mtk_gem);
+ dma_obj = mtk_gem_create(dev, args->size);
+ if (IS_ERR(dma_obj))
+ return PTR_ERR(dma_obj);
/*
* 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);
+ ret = drm_gem_handle_create(file_priv, &dma_obj->base, &args->handle);
+ /* drop reference from allocate - handle holds it now. */
+ drm_gem_object_put(&dma_obj->base);
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_gem_free_object(&mtk_gem->base);
+ mtk_gem_free_object(&dma_obj->base);
return ret;
}
@@ -160,129 +180,50 @@ static int mtk_gem_object_mmap(struct drm_gem_object *obj,
struct vm_area_struct *vma)
{
- int ret;
- struct mtk_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
+ struct drm_gem_dma_object *dma_obj = to_drm_gem_dma_obj(obj);
struct mtk_drm_private *priv = obj->dev->dev_private;
+ int ret;
/*
* Set vm_pgoff (used as a fake buffer offset by DRM) to 0 and map the
* whole buffer from the start.
*/
- vma->vm_pgoff = 0;
+ vma->vm_pgoff -= drm_vma_node_start(&obj->vma_node);
/*
* dma_alloc_attrs() allocated a struct page table for mtk_gem, so clear
* VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap().
*/
- vm_flags_set(vma, VM_IO | VM_DONTEXPAND | VM_DONTDUMP);
+ vm_flags_mod(vma, VM_IO | VM_DONTEXPAND | VM_DONTDUMP, VM_PFNMAP);
+
vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
- ret = dma_mmap_attrs(priv->dma_dev, vma, mtk_gem->cookie,
- mtk_gem->dma_addr, obj->size, mtk_gem->dma_attrs);
+ ret = dma_mmap_wc(priv->dma_dev, vma, dma_obj->vaddr,
+ dma_obj->dma_addr, obj->size);
+ if (ret)
+ drm_gem_vm_close(vma);
return ret;
}
-/*
- * Allocate a sg_table for this GEM object.
- * Note: Both the table's contents, and the sg_table itself must be freed by
- * the caller.
- * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error.
- */
-struct sg_table *mtk_gem_prime_get_sg_table(struct drm_gem_object *obj)
-{
- struct mtk_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
- struct mtk_drm_private *priv = obj->dev->dev_private;
- struct sg_table *sgt;
- int ret;
-
- sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
- if (!sgt)
- return ERR_PTR(-ENOMEM);
-
- ret = dma_get_sgtable_attrs(priv->dma_dev, sgt, mtk_gem->cookie,
- mtk_gem->dma_addr, obj->size,
- mtk_gem->dma_attrs);
- if (ret) {
- DRM_ERROR("failed to allocate sgt, %d\n", ret);
- kfree(sgt);
- return ERR_PTR(ret);
- }
-
- return sgt;
-}
-
struct drm_gem_object *mtk_gem_prime_import_sg_table(struct drm_device *dev,
- struct dma_buf_attachment *attach, struct sg_table *sg)
+ struct dma_buf_attachment *attach, struct sg_table *sgt)
{
- struct mtk_gem_obj *mtk_gem;
+ struct drm_gem_dma_object *dma_obj;
/* check if the entries in the sg_table are contiguous */
- if (drm_prime_get_contiguous_size(sg) < attach->dmabuf->size) {
+ if (drm_prime_get_contiguous_size(sgt) < attach->dmabuf->size) {
DRM_ERROR("sg_table is not contiguous");
return ERR_PTR(-EINVAL);
}
- mtk_gem = mtk_gem_init(dev, attach->dmabuf->size);
- if (IS_ERR(mtk_gem))
- return ERR_CAST(mtk_gem);
-
- mtk_gem->dma_addr = sg_dma_address(sg->sgl);
- mtk_gem->sg = sg;
-
- return &mtk_gem->base;
-}
-
-int mtk_gem_prime_vmap(struct drm_gem_object *obj, struct iosys_map *map)
-{
- struct mtk_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
- struct sg_table *sgt = NULL;
- unsigned int npages;
-
- if (mtk_gem->kvaddr)
- goto out;
-
- sgt = mtk_gem_prime_get_sg_table(obj);
- if (IS_ERR(sgt))
- return PTR_ERR(sgt);
-
- npages = obj->size >> PAGE_SHIFT;
- mtk_gem->pages = kcalloc(npages, sizeof(*mtk_gem->pages), GFP_KERNEL);
- if (!mtk_gem->pages) {
- sg_free_table(sgt);
- kfree(sgt);
- return -ENOMEM;
- }
-
- drm_prime_sg_to_page_array(sgt, mtk_gem->pages, npages);
-
- mtk_gem->kvaddr = vmap(mtk_gem->pages, npages, VM_MAP,
- pgprot_writecombine(PAGE_KERNEL));
- if (!mtk_gem->kvaddr) {
- sg_free_table(sgt);
- kfree(sgt);
- kfree(mtk_gem->pages);
- return -ENOMEM;
- }
- sg_free_table(sgt);
- kfree(sgt);
-
-out:
- iosys_map_set_vaddr(map, mtk_gem->kvaddr);
-
- return 0;
-}
-
-void mtk_gem_prime_vunmap(struct drm_gem_object *obj, struct iosys_map *map)
-{
- struct mtk_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
- void *vaddr = map->vaddr;
+ dma_obj = mtk_gem_init(dev, attach->dmabuf->size, true);
+ if (IS_ERR(dma_obj))
+ return ERR_CAST(dma_obj);
- if (!mtk_gem->pages)
- return;
+ dma_obj->dma_addr = sg_dma_address(sgt->sgl);
+ dma_obj->sgt = sgt;
- vunmap(vaddr);
- mtk_gem->kvaddr = NULL;
- kfree(mtk_gem->pages);
+ return &dma_obj->base;
}
diff --git a/drivers/gpu/drm/mediatek/mtk_gem.h b/drivers/gpu/drm/mediatek/mtk_gem.h
index 66e5f154f698..afebc3a970a8 100644
--- a/drivers/gpu/drm/mediatek/mtk_gem.h
+++ b/drivers/gpu/drm/mediatek/mtk_gem.h
@@ -7,42 +7,11 @@
#define _MTK_GEM_H_
#include <drm/drm_gem.h>
+#include <drm/drm_gem_dma_helper.h>
-/*
- * mtk drm buffer structure.
- *
- * @base: a gem object.
- * - a new handle to this gem object would be created
- * by drm_gem_handle_create().
- * @cookie: the return value of dma_alloc_attrs(), keep it for dma_free_attrs()
- * @kvaddr: kernel virtual address of gem buffer.
- * @dma_addr: dma address of gem buffer.
- * @dma_attrs: dma attributes of gem buffer.
- *
- * P.S. this object would be transferred to user as kms_bo.handle so
- * user can access the buffer through kms_bo.handle.
- */
-struct mtk_gem_obj {
- struct drm_gem_object base;
- void *cookie;
- void *kvaddr;
- dma_addr_t dma_addr;
- unsigned long dma_attrs;
- struct sg_table *sg;
- struct page **pages;
-};
-
-#define to_mtk_gem_obj(x) container_of(x, struct mtk_gem_obj, base)
-
-void mtk_gem_free_object(struct drm_gem_object *gem);
-struct mtk_gem_obj *mtk_gem_create(struct drm_device *dev, size_t size,
- bool alloc_kmap);
int mtk_gem_dumb_create(struct drm_file *file_priv, struct drm_device *dev,
struct drm_mode_create_dumb *args);
-struct sg_table *mtk_gem_prime_get_sg_table(struct drm_gem_object *obj);
struct drm_gem_object *mtk_gem_prime_import_sg_table(struct drm_device *dev,
struct dma_buf_attachment *attach, struct sg_table *sg);
-int mtk_gem_prime_vmap(struct drm_gem_object *obj, struct iosys_map *map);
-void mtk_gem_prime_vunmap(struct drm_gem_object *obj, struct iosys_map *map);
#endif
diff --git a/drivers/gpu/drm/mediatek/mtk_plane.c b/drivers/gpu/drm/mediatek/mtk_plane.c
index 1b5667ddbb03..2c632c171b73 100644
--- a/drivers/gpu/drm/mediatek/mtk_plane.c
+++ b/drivers/gpu/drm/mediatek/mtk_plane.c
@@ -11,12 +11,12 @@
#include <drm/drm_fourcc.h>
#include <drm/drm_framebuffer.h>
#include <drm/drm_gem_atomic_helper.h>
+#include <drm/drm_gem_dma_helper.h>
#include <linux/align.h>
#include "mtk_crtc.h"
#include "mtk_ddp_comp.h"
#include "mtk_drm_drv.h"
-#include "mtk_gem.h"
#include "mtk_plane.h"
static const u64 modifiers[] = {
@@ -135,8 +135,8 @@ static void mtk_plane_update_new_state(struct drm_plane_state *new_state,
struct mtk_plane_state *mtk_plane_state)
{
struct drm_framebuffer *fb = new_state->fb;
+ struct drm_gem_dma_object *dma_obj;
struct drm_gem_object *gem;
- struct mtk_gem_obj *mtk_gem;
unsigned int pitch, format;
u64 modifier;
dma_addr_t addr;
@@ -145,8 +145,8 @@ static void mtk_plane_update_new_state(struct drm_plane_state *new_state,
int offset;
gem = fb->obj[0];
- mtk_gem = to_mtk_gem_obj(gem);
- addr = mtk_gem->dma_addr;
+ dma_obj = to_drm_gem_dma_obj(gem);
+ addr = dma_obj->dma_addr;
pitch = fb->pitches[0];
format = fb->format->format;
modifier = fb->modifier;
--
2.51.1
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