Contributors: 2
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| David Woodhouse |
203 |
99.02% |
2 |
50.00% |
| Björn Helgaas |
2 |
0.98% |
2 |
50.00% |
| Total |
205 |
|
4 |
|
// SPDX-License-Identifier: GPL-2.0
/*
* Generic PCI resource mmap helper
*
* Copyright © 2017 Amazon.com, Inc. or its affiliates.
*
* Author: David Woodhouse <dwmw2@infradead.org>
*/
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/pci.h>
#ifdef ARCH_GENERIC_PCI_MMAP_RESOURCE
static const struct vm_operations_struct pci_phys_vm_ops = {
#ifdef CONFIG_HAVE_IOREMAP_PROT
.access = generic_access_phys,
#endif
};
int pci_mmap_resource_range(struct pci_dev *pdev, int bar,
struct vm_area_struct *vma,
enum pci_mmap_state mmap_state, int write_combine)
{
unsigned long size;
int ret;
size = ((pci_resource_len(pdev, bar) - 1) >> PAGE_SHIFT) + 1;
if (vma->vm_pgoff + vma_pages(vma) > size)
return -EINVAL;
if (write_combine)
vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
else
vma->vm_page_prot = pgprot_device(vma->vm_page_prot);
if (mmap_state == pci_mmap_io) {
ret = pci_iobar_pfn(pdev, bar, vma);
if (ret)
return ret;
} else
vma->vm_pgoff += (pci_resource_start(pdev, bar) >> PAGE_SHIFT);
vma->vm_ops = &pci_phys_vm_ops;
return io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
vma->vm_end - vma->vm_start,
vma->vm_page_prot);
}
#endif