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- Fix ttm bo refcnt when using the new gem obj mmap hook (Thomas) 

Cc: Gerd Hoffmann <kraxel@redhat.com>
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Merge tag 'drm-misc-next-fixes-2019-11-20' of git://anongit.freedesktop.org/drm/drm-misc into drm-next

- Fix ttm bo refcnt when using the new gem obj mmap hook (Thomas)

Cc: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

From: Sean Paul <sean@poorly.run>
Link: https://patchwork.freedesktop.org/patch/msgid/20191120204946.GA120328@art_vandelay
This commit is contained in:
Dave Airlie 2019-11-21 10:19:38 +10:00
parent 30c185da76 9786b65bc6
commit 17eee668b3
2 changed files with 39 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

50
drivers/gpu/drm/drm_gem.c
View File

@ -1105,29 +1105,6 @@ int drm_gem_mmap_obj(struct drm_gem_object *obj, unsigned long obj_size,
if (obj_size < vma->vm_end - vma->vm_start)
return -EINVAL;
if (obj->funcs && obj->funcs->mmap) {
/* Remove the fake offset */
vma->vm_pgoff -= drm_vma_node_start(&obj->vma_node);
ret = obj->funcs->mmap(obj, vma);
if (ret)
return ret;
WARN_ON(!(vma->vm_flags & VM_DONTEXPAND));
} else {
if (obj->funcs && obj->funcs->vm_ops)
vma->vm_ops = obj->funcs->vm_ops;
else if (dev->driver->gem_vm_ops)
vma->vm_ops = dev->driver->gem_vm_ops;
else
return -EINVAL;
vma->vm_flags |= VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP;
vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
}
vma->vm_private_data = obj;
/* Take a ref for this mapping of the object, so that the fault
* handler can dereference the mmap offset's pointer to the object.
* This reference is cleaned up by the corresponding vm_close
@ -1136,6 +1113,33 @@ int drm_gem_mmap_obj(struct drm_gem_object *obj, unsigned long obj_size,
*/
drm_gem_object_get(obj);
if (obj->funcs && obj->funcs->mmap) {
/* Remove the fake offset */
vma->vm_pgoff -= drm_vma_node_start(&obj->vma_node);
ret = obj->funcs->mmap(obj, vma);
if (ret) {
drm_gem_object_put_unlocked(obj);
return ret;
}
WARN_ON(!(vma->vm_flags & VM_DONTEXPAND));
} else {
if (obj->funcs && obj->funcs->vm_ops)
vma->vm_ops = obj->funcs->vm_ops;
else if (dev->driver->gem_vm_ops)
vma->vm_ops = dev->driver->gem_vm_ops;
else {
drm_gem_object_put_unlocked(obj);
return -EINVAL;
}
vma->vm_flags |= VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP;
vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
}
vma->vm_private_data = obj;
return 0;
}
EXPORT_SYMBOL(drm_gem_mmap_obj);

13
drivers/gpu/drm/drm_gem_ttm_helper.c
View File

@ -64,8 +64,19 @@ int drm_gem_ttm_mmap(struct drm_gem_object *gem,
struct vm_area_struct *vma)
{
struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(gem);
int ret;
return ttm_bo_mmap_obj(vma, bo);
ret = ttm_bo_mmap_obj(vma, bo);
if (ret < 0)
return ret;
/*
* ttm has its own object refcounting, so drop gem reference
* to avoid double accounting counting.
*/
drm_gem_object_put_unlocked(gem);
return 0;
}
EXPORT_SYMBOL(drm_gem_ttm_mmap);