1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * Generic PCI resource mmap helper
 4 *
 5 * Copyright © 2017 Amazon.com, Inc. or its affiliates.
 6 *
 7 * Author: David Woodhouse <dwmw2@infradead.org>
 8 */
 9
10#include <linux/kernel.h>
11#include <linux/mm.h>
12#include <linux/pci.h>
13
14#ifdef ARCH_GENERIC_PCI_MMAP_RESOURCE
15
16static const struct vm_operations_struct pci_phys_vm_ops = {
17#ifdef CONFIG_HAVE_IOREMAP_PROT
18	.access = generic_access_phys,
19#endif
20};
21
22int pci_mmap_resource_range(struct pci_dev *pdev, int bar,
23			    struct vm_area_struct *vma,
24			    enum pci_mmap_state mmap_state, int write_combine)
25{
26	unsigned long size;
27	int ret;
28
29	size = ((pci_resource_len(pdev, bar) - 1) >> PAGE_SHIFT) + 1;
30	if (vma->vm_pgoff + vma_pages(vma) > size)
31		return -EINVAL;
32
33	if (write_combine)
34		vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
35	else
36		vma->vm_page_prot = pgprot_device(vma->vm_page_prot);
37
38	if (mmap_state == pci_mmap_io) {
39		ret = pci_iobar_pfn(pdev, bar, vma);
40		if (ret)
41			return ret;
42	} else
43		vma->vm_pgoff += (pci_resource_start(pdev, bar) >> PAGE_SHIFT);
44
45	vma->vm_ops = &pci_phys_vm_ops;
46
47	return io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
48				  vma->vm_end - vma->vm_start,
49				  vma->vm_page_prot);
50}
51
52#endif

 1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * Generic PCI resource mmap helper
 4 *
 5 * Copyright © 2017 Amazon.com, Inc. or its affiliates.
 6 *
 7 * Author: David Woodhouse <dwmw2@infradead.org>
 8 */
 9
10#include <linux/kernel.h>
11#include <linux/mm.h>
12#include <linux/pci.h>
13
14#ifdef ARCH_GENERIC_PCI_MMAP_RESOURCE
15
16static const struct vm_operations_struct pci_phys_vm_ops = {
17#ifdef CONFIG_HAVE_IOREMAP_PROT
18	.access = generic_access_phys,
19#endif
20};
21
22int pci_mmap_resource_range(struct pci_dev *pdev, int bar,
23			    struct vm_area_struct *vma,
24			    enum pci_mmap_state mmap_state, int write_combine)
25{
26	unsigned long size;
27	int ret;
28
29	size = ((pci_resource_len(pdev, bar) - 1) >> PAGE_SHIFT) + 1;
30	if (vma->vm_pgoff + vma_pages(vma) > size)
31		return -EINVAL;
32
33	if (write_combine)
34		vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
35	else
36		vma->vm_page_prot = pgprot_device(vma->vm_page_prot);
37
38	if (mmap_state == pci_mmap_io) {
39		ret = pci_iobar_pfn(pdev, bar, vma);
40		if (ret)
41			return ret;
42	} else
43		vma->vm_pgoff += (pci_resource_start(pdev, bar) >> PAGE_SHIFT);
44
45	vma->vm_ops = &pci_phys_vm_ops;
46
47	return io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
48				  vma->vm_end - vma->vm_start,
49				  vma->vm_page_prot);
50}
51
52#endif