linux-imx

/*

 * Copyright 2003 José Fonseca.

 * Copyright 2003 Leif Delgass.

 * All Rights Reserved.

 *

 * Permission is hereby granted, free of charge, to any person obtaining a

 * copy of this software and associated documentation files (the "Software"),

 * to deal in the Software without restriction, including without limitation

 * the rights to use, copy, modify, merge, publish, distribute, sublicense,

 * and/or sell copies of the Software, and to permit persons to whom the

 * Software is furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice (including the next

 * paragraph) shall be included in all copies or substantial portions of the

 * Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE

 * AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN

 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION

 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

 */

​

#include <linux/pci.h>

#include <linux/slab.h>

#include <linux/dma-mapping.h>

#include <linux/export.h>

#include <drm/drm_pci.h>

#include <drm/drmP.h>

#include "drm_internal.h"

#include "drm_legacy.h"

​

/**

 * drm_pci_alloc - Allocate a PCI consistent memory block, for DMA.

 * @dev: DRM device

 * @size: size of block to allocate

 * @align: alignment of block

 *

 * FIXME: This is a needless abstraction of the Linux dma-api and should be

 * removed.

 *

 * Return: A handle to the allocated memory block on success or NULL on

 * failure.

 */

drm_dma_handle_t *drm_pci_alloc(struct drm_device * dev, size_t size, size_t align)

{

    drm_dma_handle_t *dmah;

    unsigned long addr;

    size_t sz;

​

    /* pci_alloc_consistent only guarantees alignment to the smallest

     * PAGE_SIZE order which is greater than or equal to the requested size.

     * Return NULL here for now to make sure nobody tries for larger alignment

     */

    if (align > size)

        return NULL;

​

    dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL);

    if (!dmah)

        return NULL;

​

    dmah->size = size;