projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 | ||
| 14 | #ifdef ARCH_GENERIC_PCI_MMAP_RESOURCE | |
| 15 | ||
| f7195824 DW |
16 | static const struct vm_operations_struct pci_phys_vm_ops = { |
| 17 | #ifdef CONFIG_HAVE_IOREMAP_PROT | |
| 18 | .access = generic_access_phys, | |
| 19 | #endif | |
| 20 | }; | |
| 21 | ||
| 22 | int 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; | |
| 2bea36fd | 27 | int ret; |
| f7195824 DW |
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 | ||
| 2bea36fd DW |
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 | ||
| f7195824 DW |
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 | ||
| f7195824 | 52 | #endif |