* pci/resource-mmap: ia64: Use generic pci_mmap_resource_range() ia64: Remove redundant checks for WC in pci_mmap_page_range() ia64: Remove redundant valid_mmap_phys_addr_range() from pci_mmap_page_range() PCI: Add I/O BAR support to generic pci_mmap_resource_range() x86/PCI: Use generic pci_mmap_resource_range() unicore32/PCI: Use generic pci_mmap_resource_range() sh/PCI: Use generic pci_mmap_resource_range() parisc: Use generic pci_mmap_resource_range() mn10300/PCI: Use generic pci_mmap_resource_range() MIPS: PCI: Use generic pci_mmap_resource_range() cris/PCI: Use generic pci_mmap_resource_range() ARM/PCI: Use generic pci_mmap_resource_range() PCI: Add pci_mmap_resource_range() and use it for ARM64 PCI: Add BAR index argument to pci_mmap_page_range() PCI: Use BAR index in sysfs attr->private instead of resource pointer PCI: Add arch_can_pci_mmap_io() on architectures which can mmap() I/O space PCI: Move multiple declarations of pci_mmap_page_range() to <linux/pci.h> PCI: Add arch_can_pci_mmap_wc() macro xtensa/PCI: Do not mmap PCI BARs to userspace as write-through PCI: Only allow WC mmap on prefetchable resources PCI: Fix another sanity check bug in /proc/pci mmap PCI: Fix pci_mmap_fits() for HAVE_PCI_RESOURCE_TO_USER platformstirimbino
Bjorn Helgaas
8 years ago
commit
889e4dd916
@ -0,0 +1,99 @@ |
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/*
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* mmap.c — 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 <dwmw2@infradead.org> |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License version 2 as |
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* published by the Free Software Foundation. |
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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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/*
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* Modern setup: generic pci_mmap_resource_range(), and implement the legacy |
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* pci_mmap_page_range() (if needed) as a wrapper round it. |
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*/ |
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#ifdef HAVE_PCI_MMAP |
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int pci_mmap_page_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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resource_size_t start, end; |
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pci_resource_to_user(pdev, bar, &pdev->resource[bar], &start, &end); |
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/* Adjust vm_pgoff to be the offset within the resource */ |
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vma->vm_pgoff -= start >> PAGE_SHIFT; |
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return pci_mmap_resource_range(pdev, bar, vma, mmap_state, |
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write_combine); |
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} |
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#endif |
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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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#elif defined(HAVE_PCI_MMAP) /* && !ARCH_GENERIC_PCI_MMAP_RESOURCE */ |
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/*
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* Legacy setup: Impement pci_mmap_resource_range() as a wrapper around |
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* the architecture's pci_mmap_page_range(), converting to "user visible" |
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* addresses as necessary. |
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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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resource_size_t start, end; |
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/*
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* pci_mmap_page_range() expects the same kind of entry as coming |
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* from /proc/bus/pci/ which is a "user visible" value. If this is |
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* different from the resource itself, arch will do necessary fixup. |
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*/ |
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pci_resource_to_user(pdev, bar, &pdev->resource[bar], &start, &end); |
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vma->vm_pgoff += start >> PAGE_SHIFT; |
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return pci_mmap_page_range(pdev, bar, vma, mmap_state, write_combine); |
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} |
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#endif |
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