Use new return type vm_fault_t for fault handler. For now, this is just documenting that the function returns a VM_FAULT value rather than an errno. Once all instances are converted, vm_fault_t will become a distinct type.
Ref-> commit 1c8f422059ae ("mm: change return type to vm_fault_t")
Previously vm_insert_page() returns err which driver mapped into VM_FAULT_* type. The new function vmf_insert_page() will replace this inefficiency by returning VM_FAULT_* type.
vmf_error() is the newly introduce inline function in 4.17-rc6.
Signed-off-by: Souptick Joarder jrdr.linux@gmail.com Reviewed-by: Matthew Wilcox mawilcox@microsoft.com --- v2: mutex_lock_killable() is replaced with previous mutex_lock_interruptible() cause that discussion is not yet reached to any conclusion.
v3: updated the change log.
drivers/gpu/drm/etnaviv/etnaviv_drv.h | 3 ++- drivers/gpu/drm/etnaviv/etnaviv_gem.c | 37 +++++++++-------------------------- 2 files changed, 11 insertions(+), 29 deletions(-)
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_drv.h b/drivers/gpu/drm/etnaviv/etnaviv_drv.h index a54f0b7..f6777f0 100644 --- a/drivers/gpu/drm/etnaviv/etnaviv_drv.h +++ b/drivers/gpu/drm/etnaviv/etnaviv_drv.h @@ -28,6 +28,7 @@ #include <linux/list.h> #include <linux/types.h> #include <linux/sizes.h> +#include <linux/mm_types.h>
#include <drm/drmP.h> #include <drm/drm_crtc_helper.h> @@ -62,7 +63,7 @@ int etnaviv_ioctl_gem_submit(struct drm_device *dev, void *data, struct drm_file *file);
int etnaviv_gem_mmap(struct file *filp, struct vm_area_struct *vma); -int etnaviv_gem_fault(struct vm_fault *vmf); +vm_fault_t etnaviv_gem_fault(struct vm_fault *vmf); 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); void *etnaviv_gem_prime_vmap(struct drm_gem_object *obj); diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem.c b/drivers/gpu/drm/etnaviv/etnaviv_gem.c index fcc969f..b36e1ef 100644 --- a/drivers/gpu/drm/etnaviv/etnaviv_gem.c +++ b/drivers/gpu/drm/etnaviv/etnaviv_gem.c @@ -180,31 +180,30 @@ int etnaviv_gem_mmap(struct file *filp, struct vm_area_struct *vma) return obj->ops->mmap(obj, vma); }
-int etnaviv_gem_fault(struct vm_fault *vmf) +vm_fault_t etnaviv_gem_fault(struct vm_fault *vmf) { struct vm_area_struct *vma = vmf->vma; struct drm_gem_object *obj = vma->vm_private_data; struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj); struct page **pages, *page; pgoff_t pgoff; - int ret; + int err;
/* * Make sure we don't parallel update on a fault, nor move or remove - * something from beneath our feet. Note that vm_insert_page() is + * something from beneath our feet. Note that vmf_insert_page() is * specifically coded to take care of this, so we don't have to. */ - ret = mutex_lock_interruptible(&etnaviv_obj->lock); - if (ret) - goto out; - + err = mutex_lock_interruptible(&etnaviv_obj->lock); + if (err) + return VM_FAULT_NOPAGE; /* make sure we have pages attached now */ pages = etnaviv_gem_get_pages(etnaviv_obj); mutex_unlock(&etnaviv_obj->lock);
if (IS_ERR(pages)) { - ret = PTR_ERR(pages); - goto out; + err = PTR_ERR(pages); + return vmf_error(err); }
/* We don't use vmf->pgoff since that has the fake offset: */ @@ -215,25 +214,7 @@ int etnaviv_gem_fault(struct vm_fault *vmf) VERB("Inserting %p pfn %lx, pa %lx", (void *)vmf->address, page_to_pfn(page), page_to_pfn(page) << PAGE_SHIFT);
- ret = vm_insert_page(vma, vmf->address, page); - -out: - 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; - } + return vmf_insert_page(vma, vmf->address, page); }
int etnaviv_gem_mmap_offset(struct drm_gem_object *obj, u64 *offset)