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52 lines
1.2 KiB
52 lines
1.2 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Generic PCI resource mmap helper |
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* |
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* Copyright © 2017 Amazon.com, Inc. or its affiliates. |
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* |
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* Author: David Woodhouse <[email protected]> |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/mm.h> |
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#include <linux/pci.h> |
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#ifdef ARCH_GENERIC_PCI_MMAP_RESOURCE |
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static const struct vm_operations_struct pci_phys_vm_ops = { |
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#ifdef CONFIG_HAVE_IOREMAP_PROT |
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.access = generic_access_phys, |
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#endif |
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}; |
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int pci_mmap_resource_range(struct pci_dev *pdev, int bar, |
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struct vm_area_struct *vma, |
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enum pci_mmap_state mmap_state, int write_combine) |
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{ |
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unsigned long size; |
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int ret; |
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size = ((pci_resource_len(pdev, bar) - 1) >> PAGE_SHIFT) + 1; |
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if (vma->vm_pgoff + vma_pages(vma) > size) |
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return -EINVAL; |
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if (write_combine) |
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vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot); |
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else |
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vma->vm_page_prot = pgprot_device(vma->vm_page_prot); |
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if (mmap_state == pci_mmap_io) { |
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ret = pci_iobar_pfn(pdev, bar, vma); |
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if (ret) |
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return ret; |
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} else |
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vma->vm_pgoff += (pci_resource_start(pdev, bar) >> PAGE_SHIFT); |
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vma->vm_ops = &pci_phys_vm_ops; |
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return io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, |
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vma->vm_end - vma->vm_start, |
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vma->vm_page_prot); |
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} |
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#endif
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