forked from Minki/linux
53 lines
1.3 KiB
C
53 lines
1.3 KiB
C
|
/*
|
||
|
|
* Copyright © 2015 Broadcom
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify
|
||
|
|
* it under the terms of the GNU General Public License version 2 as
|
||
|
|
* published by the Free Software Foundation.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/* DOC: VC4 GEM BO management support.
|
||
|
|
*
|
||
|
|
* The VC4 GPU architecture (both scanout and rendering) has direct
|
||
|
|
* access to system memory with no MMU in between. To support it, we
|
||
|
|
* use the GEM CMA helper functions to allocate contiguous ranges of
|
||
|
|
* physical memory for our BOs.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "vc4_drv.h"
|
||
|
|
|
||
|
|
struct vc4_bo *vc4_bo_create(struct drm_device *dev, size_t size)
|
||
|
|
{
|
||
|
|
struct drm_gem_cma_object *cma_obj;
|
||
|
|
|
||
|
|
cma_obj = drm_gem_cma_create(dev, size);
|
||
|
|
if (IS_ERR(cma_obj))
|
||
|
|
return NULL;
|
||
|
|
else
|
||
|
|
return to_vc4_bo(&cma_obj->base);
|
||
|
|
}
|
||
|
|
|
||
|
|
int vc4_dumb_create(struct drm_file *file_priv,
|
||
|
|
struct drm_device *dev,
|
||
|
|
struct drm_mode_create_dumb *args)
|
||
|
|
{
|
||
|
|
int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
|
||
|
|
struct vc4_bo *bo = NULL;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
if (args->pitch < min_pitch)
|
||
|
|
args->pitch = min_pitch;
|
||
|
|
|
||
|
|
if (args->size < args->pitch * args->height)
|
||
|
|
args->size = args->pitch * args->height;
|
||
|
|
|
||
|
|
bo = vc4_bo_create(dev, roundup(args->size, PAGE_SIZE));
|
||
|
|
if (!bo)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
ret = drm_gem_handle_create(file_priv, &bo->base.base, &args->handle);
|
||
|
|
drm_gem_object_unreference_unlocked(&bo->base.base);
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|