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drm/mediatek: Implement mmap as GEM object function

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Moving the driver-specific mmap code into a GEM object function allows
for using DRM helpers for various mmap callbacks.

The respective mediatek functions are being removed. The file_operations
structure fops is now being created by the helper macro
DEFINE_DRM_GEM_FOPS().

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>
This commit is contained in:
Thomas Zimmermann 2021-06-24 11:01:26 +02:00 committed by Chun-Kuang Hu
parent c7ef8f3572
commit 500007ebba
3 changed files with 14 additions and 46 deletions
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13
drivers/gpu/drm/mediatek/mtk_drm_drv.c
View File

@ -300,16 +300,7 @@ static void mtk_drm_kms_deinit(struct drm_device *drm)
component_unbind_all(drm->dev, drm);
}
static const struct file_operations mtk_drm_fops = {
.owner = THIS_MODULE,
.open = drm_open,
.release = drm_release,
.unlocked_ioctl = drm_ioctl,
.mmap = mtk_drm_gem_mmap,
.poll = drm_poll,
.read = drm_read,
.compat_ioctl = drm_compat_ioctl,
};
DEFINE_DRM_GEM_FOPS(mtk_drm_fops);
/*
* We need to override this because the device used to import the memory is
@ -332,7 +323,7 @@ static const struct drm_driver mtk_drm_driver = {
.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
.gem_prime_import = mtk_drm_gem_prime_import,
.gem_prime_import_sg_table = mtk_gem_prime_import_sg_table,
.gem_prime_mmap = mtk_drm_gem_mmap_buf,
.gem_prime_mmap = drm_gem_prime_mmap,
.fops = &mtk_drm_fops,
.name = DRIVER_NAME,

44
drivers/gpu/drm/mediatek/mtk_drm_gem.c
View File

@ -14,11 +14,14 @@
#include "mtk_drm_drv.h"
#include "mtk_drm_gem.h"
static int mtk_drm_gem_object_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma);
static const struct drm_gem_object_funcs mtk_drm_gem_object_funcs = {
.free = mtk_drm_gem_free_object,
.get_sg_table = mtk_gem_prime_get_sg_table,
.vmap = mtk_drm_gem_prime_vmap,
.vunmap = mtk_drm_gem_prime_vunmap,
.mmap = mtk_drm_gem_object_mmap,
.vm_ops = &drm_gem_cma_vm_ops,
};
@ -145,11 +148,19 @@ static int mtk_drm_gem_object_mmap(struct drm_gem_object *obj,
struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
struct mtk_drm_private *priv = obj->dev->dev_private;
/*
* 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;
/*
* 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().
*/
vma->vm_flags &= ~VM_PFNMAP;
vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
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);
@ -159,37 +170,6 @@ static int mtk_drm_gem_object_mmap(struct drm_gem_object *obj,
return ret;
}
int mtk_drm_gem_mmap_buf(struct drm_gem_object *obj, struct vm_area_struct *vma)
{
int ret;
ret = drm_gem_mmap_obj(obj, obj->size, vma);
if (ret)
return ret;
return mtk_drm_gem_object_mmap(obj, vma);
}
int mtk_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
{
struct drm_gem_object *obj;
int ret;
ret = drm_gem_mmap(filp, vma);
if (ret)
return ret;
obj = vma->vm_private_data;
/*
* 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;
return mtk_drm_gem_object_mmap(obj, vma);
}
/*
* Allocate a sg_table for this GEM object.
* Note: Both the table's contents, and the sg_table itself must be freed by

3
drivers/gpu/drm/mediatek/mtk_drm_gem.h
View File

@ -39,9 +39,6 @@ struct mtk_drm_gem_obj *mtk_drm_gem_create(struct drm_device *dev, size_t size,
bool alloc_kmap);
int mtk_drm_gem_dumb_create(struct drm_file *file_priv, struct drm_device *dev,
struct drm_mode_create_dumb *args);
int mtk_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma);
int mtk_drm_gem_mmap_buf(struct drm_gem_object *obj,
struct vm_area_struct *vma);
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);