Re: [PATCH v2] gpu: drm: v3d: use new return type vm_fault_t

[Souptick Joarder]

please ignore this mail.

On Wed, Jul 4, 2018 at 8:18 PM, Souptick Joarder <jrdr.linux@xxxxxxxxx> wrote:
> Convert v3d_gem_fault to return vm_fault_t
>
> Instead of converting an errno into a vm_fault_t ourselves, use
> vmf_insert_mixed() which returns a vm_fault_t directly.
>
> Signed-off-by: Souptick Joarder <jrdr.linux@xxxxxxxxx>
> ---
>  drivers/gpu/drm/v3d/v3d_bo.c  | 28 +++++-----------------------
>  drivers/gpu/drm/v3d/v3d_drv.h |  3 ++-
>  2 files changed, 7 insertions(+), 24 deletions(-)
>
> diff --git a/drivers/gpu/drm/v3d/v3d_bo.c b/drivers/gpu/drm/v3d/v3d_bo.c
> index 7b1e2a5..54d9651 100644
> --- a/drivers/gpu/drm/v3d/v3d_bo.c
> +++ b/drivers/gpu/drm/v3d/v3d_bo.c
> @@ -227,37 +227,19 @@ struct reservation_object *v3d_prime_res_obj(struct drm_gem_object *obj)
>         vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
>  }
>
> -int v3d_gem_fault(struct vm_fault *vmf)
> +vm_fault_t v3d_gem_fault(struct vm_fault *vmf)
>  {
>         struct vm_area_struct *vma = vmf->vma;
>         struct drm_gem_object *obj = vma->vm_private_data;
>         struct v3d_bo *bo = to_v3d_bo(obj);
> -       unsigned long pfn;
> +       pfn_t pfn;
>         pgoff_t pgoff;
> -       int ret;
>
>         /* We don't use vmf->pgoff since that has the fake offset: */
>         pgoff = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
> -       pfn = page_to_pfn(bo->pages[pgoff]);
> -
> -       ret = vm_insert_mixed(vma, vmf->address, __pfn_to_pfn_t(pfn, PFN_DEV));
> -
> -       switch (ret) {
> -       case -EAGAIN:
> -       case 0:
> -       case -ERESTARTSYS:
> -       case -EINTR:
> -       case -EBUSY:
> -               /*
> -                * EBUSY is ok: this just means that another thread
> -                * already did the job.
> -                */
> -               return VM_FAULT_NOPAGE;
> -       case -ENOMEM:
> -               return VM_FAULT_OOM;
> -       default:
> -               return VM_FAULT_SIGBUS;
> -       }
> +       pfn = __pfn_to_pfn_t(page_to_pfn(bo->pages[pgoff]), PFN_DEV);
> +
> +       return vmf_insert_mixed(vma, vmf->address, pfn);
>  }
>
>  int v3d_mmap(struct file *filp, struct vm_area_struct *vma)
> diff --git a/drivers/gpu/drm/v3d/v3d_drv.h b/drivers/gpu/drm/v3d/v3d_drv.h
> index a043ac3..09aa634 100644
> --- a/drivers/gpu/drm/v3d/v3d_drv.h
> +++ b/drivers/gpu/drm/v3d/v3d_drv.h
> @@ -2,6 +2,7 @@
>  /* Copyright (C) 2015-2018 Broadcom */
>
>  #include <linux/reservation.h>
> +#include <linux/mm_types.h>
>  #include <drm/drmP.h>
>  #include <drm/drm_encoder.h>
>  #include <drm/drm_gem.h>
> @@ -248,7 +249,7 @@ int v3d_mmap_bo_ioctl(struct drm_device *dev, void *data,
>                       struct drm_file *file_priv);
>  int v3d_get_bo_offset_ioctl(struct drm_device *dev, void *data,
>                             struct drm_file *file_priv);
> -int v3d_gem_fault(struct vm_fault *vmf);
> +vm_fault_t v3d_gem_fault(struct vm_fault *vmf);
>  int v3d_mmap(struct file *filp, struct vm_area_struct *vma);
>  struct reservation_object *v3d_prime_res_obj(struct drm_gem_object *obj);
>  int v3d_prime_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma);
> --
> 1.9.1
>