Re: [PATCH v15 04/19] drm/etnaviv: Make etnaviv_gem_prime_vmap() a static function

[Sui Jingfeng]

Hi,

On 2024/10/1 21:40, Lucas Stach wrote:
> Am Sonntag, dem 08.09.2024 um 17:43 +0800 schrieb Sui Jingfeng:
> > The etnaviv_gem_prime_vmap() function has no caller in the
> > etnaviv_gem_prime.c file, move it into etnaviv_gem.c file.
> > While at it, rename it as etnaviv_gem_object_vmap(), since
> > it is a intermidiate layer function, it has no direct relation
> > ship with the PRIME. The etnaviv_gem_prime.c file already has
> > etnaviv_gem_prime_vmap_impl() as the implementation to vmap
> > a imported GEM buffer object.
> I don't agree with the premise with this patch.

I think it is a fact, not a premise.

> This function is
> clearly prime specific,

Because the drm_gem_object_funcs::vmap() will be called by the drm_gem_vmap().
Therefore, all etnaviv GEM buffer object has to response to the invoke of the
drm_gem_object_funcs::vmap() interface.

- Dedicated VRAM buffer object
- SHMEM buffer object
- PRIME buffer object
- userptr (I'm not sure if this one has the need)

> so I don't think it should move.

The name of the etnaviv_gem_prime_vmap() sounds like that
a PRIME buffer object is being vmapped. But dedicated VRAM
backed BO, SHMEM backed BO can also be vmapped as well. So
I think the etnaviv_gem_object_vmap() should be universal.


> Regards,
> Lucas
>
> > Signed-off-by: Sui Jingfeng <sui.jingfeng@xxxxxxxxx>
> > ---
> >   drivers/gpu/drm/etnaviv/etnaviv_drv.h       |  1 -
> >   drivers/gpu/drm/etnaviv/etnaviv_gem.c       | 16 +++++++++++++++-
> >   drivers/gpu/drm/etnaviv/etnaviv_gem_prime.c | 12 ------------
> >   3 files changed, 15 insertions(+), 14 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/etnaviv/etnaviv_drv.h b/drivers/gpu/drm/etnaviv/etnaviv_drv.h
> > index 2eb2ff13f6e8..c217b54b214c 100644
> > --- a/drivers/gpu/drm/etnaviv/etnaviv_drv.h
> > +++ b/drivers/gpu/drm/etnaviv/etnaviv_drv.h
> > @@ -55,7 +55,6 @@ int etnaviv_ioctl_gem_submit(struct drm_device *dev, void *data,
> >   
> >   int etnaviv_gem_mmap_offset(struct drm_gem_object *obj, u64 *offset);
> >   struct sg_table *etnaviv_gem_prime_get_sg_table(struct drm_gem_object *obj);
> > -int etnaviv_gem_prime_vmap(struct drm_gem_object *obj, struct iosys_map *map);
> >   struct drm_gem_object *etnaviv_gem_prime_import_sg_table(struct drm_device *dev,
> >   	struct dma_buf_attachment *attach, struct sg_table *sg);
> >   int etnaviv_gem_prime_pin(struct drm_gem_object *obj);
> > diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem.c b/drivers/gpu/drm/etnaviv/etnaviv_gem.c
> > index fad23494d08e..85d4e7c87a6a 100644
> > --- a/drivers/gpu/drm/etnaviv/etnaviv_gem.c
> > +++ b/drivers/gpu/drm/etnaviv/etnaviv_gem.c
> > @@ -6,6 +6,7 @@
> >   #include <drm/drm_gem.h>
> >   #include <drm/drm_prime.h>
> >   #include <linux/dma-mapping.h>
> > +#include <linux/iosys-map.h>
> >   #include <linux/shmem_fs.h>
> >   #include <linux/spinlock.h>
> >   #include <linux/vmalloc.h>
> > @@ -340,6 +341,19 @@ void *etnaviv_gem_vmap(struct drm_gem_object *obj)
> >   	return etnaviv_obj->vaddr;
> >   }
> >   
> > +static int etnaviv_gem_object_vmap(struct drm_gem_object *obj,
> > +				   struct iosys_map *map)
> > +{
> > +	void *vaddr;
> > +
> > +	vaddr = etnaviv_gem_vmap(obj);
> > +	if (!vaddr)
> > +		return -ENOMEM;
> > +	iosys_map_set_vaddr(map, vaddr);
> > +
> > +	return 0;
> > +}
> > +
> >   void etnaviv_gem_vunmap(struct drm_gem_object *obj)
> >   {
> >   	struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
> > @@ -595,7 +609,7 @@ static const struct drm_gem_object_funcs etnaviv_gem_object_funcs = {
> >   	.pin = etnaviv_gem_prime_pin,
> >   	.unpin = etnaviv_gem_prime_unpin,
> >   	.get_sg_table = etnaviv_gem_prime_get_sg_table,
> > -	.vmap = etnaviv_gem_prime_vmap,
> > +	.vmap = etnaviv_gem_object_vmap,
> >   	.vunmap = etnaviv_gem_object_vunmap,
> >   	.mmap = etnaviv_gem_mmap,
> >   	.vm_ops = &vm_ops,
> > diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem_prime.c b/drivers/gpu/drm/etnaviv/etnaviv_gem_prime.c
> > index bea50d720450..8f523cbee60a 100644
> > --- a/drivers/gpu/drm/etnaviv/etnaviv_gem_prime.c
> > +++ b/drivers/gpu/drm/etnaviv/etnaviv_gem_prime.c
> > @@ -25,18 +25,6 @@ struct sg_table *etnaviv_gem_prime_get_sg_table(struct drm_gem_object *obj)
> >   	return drm_prime_pages_to_sg(obj->dev, etnaviv_obj->pages, npages);
> >   }
> >   
> > -int etnaviv_gem_prime_vmap(struct drm_gem_object *obj, struct iosys_map *map)
> > -{
> > -	void *vaddr;
> > -
> > -	vaddr = etnaviv_gem_vmap(obj);
> > -	if (!vaddr)
> > -		return -ENOMEM;
> > -	iosys_map_set_vaddr(map, vaddr);
> > -
> > -	return 0;
> > -}
> > -
> >   int etnaviv_gem_prime_pin(struct drm_gem_object *obj)
> >   {
> >   	if (!obj->import_attach) {

--
Best regards,
Sui