Commit | Line | Data |
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8cfab3cf | 1 | // SPDX-License-Identifier: GPL-2.0 |
f7195824 | 2 | /* |
df62ab5e | 3 | * Generic PCI resource mmap helper |
f7195824 DW |
4 | * |
5 | * Copyright © 2017 Amazon.com, Inc. or its affiliates. | |
6 | * | |
7 | * Author: David Woodhouse <dwmw2@infradead.org> | |
f7195824 DW |
8 | */ |
9 | ||
10 | #include <linux/kernel.h> | |
11 | #include <linux/mm.h> | |
12 | #include <linux/pci.h> | |
13 | ||
be9c3a4c LW |
14 | #include "pci.h" |
15 | ||
f7195824 DW |
16 | #ifdef ARCH_GENERIC_PCI_MMAP_RESOURCE |
17 | ||
f7195824 DW |
18 | static const struct vm_operations_struct pci_phys_vm_ops = { |
19 | #ifdef CONFIG_HAVE_IOREMAP_PROT | |
20 | .access = generic_access_phys, | |
21 | #endif | |
22 | }; | |
23 | ||
24 | int pci_mmap_resource_range(struct pci_dev *pdev, int bar, | |
25 | struct vm_area_struct *vma, | |
26 | enum pci_mmap_state mmap_state, int write_combine) | |
27 | { | |
28 | unsigned long size; | |
2bea36fd | 29 | int ret; |
f7195824 DW |
30 | |
31 | size = ((pci_resource_len(pdev, bar) - 1) >> PAGE_SHIFT) + 1; | |
32 | if (vma->vm_pgoff + vma_pages(vma) > size) | |
33 | return -EINVAL; | |
34 | ||
35 | if (write_combine) | |
36 | vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot); | |
37 | else | |
38 | vma->vm_page_prot = pgprot_device(vma->vm_page_prot); | |
39 | ||
2bea36fd DW |
40 | if (mmap_state == pci_mmap_io) { |
41 | ret = pci_iobar_pfn(pdev, bar, vma); | |
42 | if (ret) | |
43 | return ret; | |
44 | } else | |
45 | vma->vm_pgoff += (pci_resource_start(pdev, bar) >> PAGE_SHIFT); | |
46 | ||
f7195824 DW |
47 | vma->vm_ops = &pci_phys_vm_ops; |
48 | ||
49 | return io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, | |
50 | vma->vm_end - vma->vm_start, | |
51 | vma->vm_page_prot); | |
52 | } | |
53 | ||
f7195824 | 54 | #endif |
be9c3a4c LW |
55 | |
56 | #if (defined(CONFIG_SYSFS) || defined(CONFIG_PROC_FS)) && \ | |
57 | (defined(HAVE_PCI_MMAP) || defined(ARCH_GENERIC_PCI_MMAP_RESOURCE)) | |
58 | ||
59 | int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma, | |
60 | enum pci_mmap_api mmap_api) | |
61 | { | |
62 | resource_size_t pci_start = 0, pci_end; | |
63 | unsigned long nr, start, size; | |
64 | ||
65 | if (pci_resource_len(pdev, resno) == 0) | |
66 | return 0; | |
67 | nr = vma_pages(vma); | |
68 | start = vma->vm_pgoff; | |
69 | size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1; | |
70 | if (mmap_api == PCI_MMAP_PROCFS) { | |
71 | pci_resource_to_user(pdev, resno, &pdev->resource[resno], | |
72 | &pci_start, &pci_end); | |
73 | pci_start >>= PAGE_SHIFT; | |
74 | } | |
75 | if (start >= pci_start && start < pci_start + size && | |
76 | start + nr <= pci_start + size) | |
77 | return 1; | |
78 | return 0; | |
79 | } | |
80 | ||
81 | #endif |