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/*
* Copyright © 2014 Intel Corporation
*
* 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 OR COPYRIGHT HOLDERS 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/mm.h>
#include <linux/io-mapping.h>
#include "i915_drv.h"
#define EXPECTED_FLAGS (VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP)
#define use_dma(io) ((io) != -1)
/**
* remap_io_sg - remap an IO mapping to userspace
* @vma: user vma to map to
* @addr: target user address to start at
* @size: size of map area
* @sgl: Start sg entry
* @iobase: Use stored dma address offset by this address or pfn if -1
*
* Note: this is only safe if the mm semaphore is held when called.
*/
int remap_io_sg(struct vm_area_struct *vma,
unsigned long addr, unsigned long size,
struct scatterlist *sgl, resource_size_t iobase)
{
unsigned long pfn, len, remapped = 0;
int err;
/* We rely on prevalidation of the io-mapping to skip track_pfn(). */
GEM_BUG_ON((vma->vm_flags & EXPECTED_FLAGS) != EXPECTED_FLAGS);
if (!use_dma(iobase))
flush_cache_range(vma, addr, size);
do {
if (use_dma(iobase)) {
if (!sg_dma_len(sgl))
break;
pfn = (sg_dma_address(sgl) + iobase) >> PAGE_SHIFT;
len = sg_dma_len(sgl);
} else {
pfn = page_to_pfn(sg_page(sgl));
len = sgl->length;
}
err = remap_pfn_range(vma, addr + remapped, pfn, len,
vma->vm_page_prot);
if (err)
break;
remapped += len;
} while ((sgl = __sg_next(sgl)));
if (err)
zap_vma_ptes(vma, addr, remapped);
return err;
}
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