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

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

[Souptick Joarder]

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@gmail.com>
---
v2: Address Matthew's comment.
    Updated the changelog

 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

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

[Matthew Wilcox]

On Wed, Jul 04, 2018 at 08:25:57PM +0530, Souptick Joarder 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@gmail.com>

Reviewed-by: Matthew Wilcox <willy@infradead.org>

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

[Eric Anholt]

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Matthew Wilcox <willy@infradead.org> writes:

> On Wed, Jul 04, 2018 at 08:25:57PM +0530, Souptick Joarder 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@gmail.com>
>
> Reviewed-by: Matthew Wilcox <willy@infradead.org>

Thanks!  I touched up the commit message and pushed to drm-misc-next.

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

[Souptick Joarder]

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@gmail.com>
---
 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

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@gmail.com> 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@gmail.com>
> ---
>  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
>