We want to stop gup, which isn't the case if we use vmf_insert_page
and VM_MIXEDMAP, because that does not set pte_special.
v2: With this shmem gem helpers now definitely need CONFIG_MMU (0day)
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
Cc: Maxime Ripard <mripard@xxxxxxxxxx>
Cc: Thomas Zimmermann <tzimmermann@xxxxxxx>
Cc: David Airlie <airlied@xxxxxxxx>
Cc: Daniel Vetter <daniel@xxxxxxxx>
---
drivers/gpu/drm/Kconfig | 2 +-
drivers/gpu/drm/drm_gem_shmem_helper.c | 4 ++--
2 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index 56a55a6e6239..9c21527b791f 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -206,7 +206,7 @@ config DRM_KMS_CMA_HELPER
config DRM_GEM_SHMEM_HELPER
bool
- depends on DRM
+ depends on DRM && MMU
help
Choose this if you need the GEM shmem helper functions
diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c
index 6d625cee7a6a..11edd54f0580 100644
--- a/drivers/gpu/drm/drm_gem_shmem_helper.c
+++ b/drivers/gpu/drm/drm_gem_shmem_helper.c
@@ -542,7 +542,7 @@ static vm_fault_t drm_gem_shmem_fault(struct vm_fault *vmf)
} else {
page = shmem->pages[page_offset];
- ret = vmf_insert_page(vma, vmf->address, page);
+ ret = vmf_insert_pfn(vma, vmf->address, page_to_pfn(page));
}
mutex_unlock(&shmem->pages_lock);
@@ -612,7 +612,7 @@ int drm_gem_shmem_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
return ret;
}
- vma->vm_flags |= VM_MIXEDMAP | VM_DONTEXPAND;
+ vma->vm_flags |= VM_PFNMAP | VM_DONTEXPAND;
vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
if (shmem->map_wc)
vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
--
2.31.0
