This function can be used by drivers to create dumb buffers with non-coherent backing memory.
Signed-off-by: Paul Cercueil paul@crapouillou.net --- drivers/gpu/drm/drm_gem_cma_helper.c | 37 +++++++++++++++++++++++++--- include/drm/drm_gem_cma_helper.h | 4 +++ 2 files changed, 37 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/drm_gem_cma_helper.c b/drivers/gpu/drm/drm_gem_cma_helper.c index 717871d741fb..3bdd67795e20 100644 --- a/drivers/gpu/drm/drm_gem_cma_helper.c +++ b/drivers/gpu/drm/drm_gem_cma_helper.c @@ -163,6 +163,7 @@ EXPORT_SYMBOL_GPL(drm_gem_cma_create_noncoherent); * @drm: DRM device * @size: size of the object to allocate * @handle: return location for the GEM handle + * @noncoherent: allocate object with non-coherent cache attribute * * This function creates a CMA GEM object, allocating a physically contiguous * chunk of memory as backing store. The GEM object is then added to the list @@ -175,13 +176,13 @@ EXPORT_SYMBOL_GPL(drm_gem_cma_create_noncoherent); static struct drm_gem_cma_object * drm_gem_cma_create_with_handle(struct drm_file *file_priv, struct drm_device *drm, size_t size, - uint32_t *handle) + uint32_t *handle, bool noncoherent) { struct drm_gem_cma_object *cma_obj; struct drm_gem_object *gem_obj; int ret;
- cma_obj = drm_gem_cma_create(drm, size); + cma_obj = drm_gem_cma_create_with_cache_param(drm, size, noncoherent); if (IS_ERR(cma_obj)) return cma_obj;
@@ -258,7 +259,7 @@ int drm_gem_cma_dumb_create_internal(struct drm_file *file_priv, args->size = args->pitch * args->height;
cma_obj = drm_gem_cma_create_with_handle(file_priv, drm, args->size, - &args->handle); + &args->handle, false); return PTR_ERR_OR_ZERO(cma_obj); } EXPORT_SYMBOL_GPL(drm_gem_cma_dumb_create_internal); @@ -291,11 +292,39 @@ int drm_gem_cma_dumb_create(struct drm_file *file_priv, args->size = args->pitch * args->height;
cma_obj = drm_gem_cma_create_with_handle(file_priv, drm, args->size, - &args->handle); + &args->handle, false); return PTR_ERR_OR_ZERO(cma_obj); } EXPORT_SYMBOL_GPL(drm_gem_cma_dumb_create);
+/** + * drm_gem_cma_dumb_create_noncoherent - create a dumb buffer object with + * non-coherent cache attribute + * @file_priv: DRM file-private structure to create the dumb buffer for + * @drm: DRM device + * @args: IOCTL data + * + * Same as drm_gem_cma_dumb_create, but the dumb buffer object created has + * the non-coherent cache attribute set. + * + * Returns: + * 0 on success or a negative error code on failure. + */ +int drm_gem_cma_dumb_create_noncoherent(struct drm_file *file_priv, + struct drm_device *drm, + struct drm_mode_create_dumb *args) +{ + struct drm_gem_cma_object *cma_obj; + + args->pitch = DIV_ROUND_UP(args->width * args->bpp, 8); + args->size = args->pitch * args->height; + + cma_obj = drm_gem_cma_create_with_handle(file_priv, drm, args->size, + &args->handle, true); + return PTR_ERR_OR_ZERO(cma_obj); +} +EXPORT_SYMBOL_GPL(drm_gem_cma_dumb_create_noncoherent); + const struct vm_operations_struct drm_gem_cma_vm_ops = { .open = drm_gem_vm_open, .close = drm_gem_vm_close, diff --git a/include/drm/drm_gem_cma_helper.h b/include/drm/drm_gem_cma_helper.h index 071c73ad7177..d0e6a1cd0950 100644 --- a/include/drm/drm_gem_cma_helper.h +++ b/include/drm/drm_gem_cma_helper.h @@ -76,6 +76,10 @@ int drm_gem_cma_dumb_create(struct drm_file *file_priv, struct drm_device *drm, struct drm_mode_create_dumb *args);
+int drm_gem_cma_dumb_create_noncoherent(struct drm_file *file_priv, + struct drm_device *drm, + struct drm_mode_create_dumb *args); + /* set vm_flags and we can change the VM attribute to other one at here */ int drm_gem_cma_mmap(struct file *filp, struct vm_area_struct *vma);