cregit-Linux how code gets into the kernel

Release 4.13 lib/pci_iomap.c

Directory: lib
/*
 * Implement the default iomap interfaces
 *
 * (C) Copyright 2004 Linus Torvalds
 */
#include <linux/pci.h>
#include <linux/io.h>

#include <linux/export.h>

#ifdef CONFIG_PCI
/**
 * pci_iomap_range - create a virtual mapping cookie for a PCI BAR
 * @dev: PCI device that owns the BAR
 * @bar: BAR number
 * @offset: map memory at the given offset in BAR
 * @maxlen: max length of the memory to map
 *
 * Using this function you will get a __iomem address to your device BAR.
 * You can access it using ioread*() and iowrite*(). These functions hide
 * the details if this is a MMIO or PIO address space and will just do what
 * you expect from them in the correct way.
 *
 * @maxlen specifies the maximum length to map. If you want to get access to
 * the complete BAR from offset to the end, pass %0 here.
 * */

void __iomem *pci_iomap_range(struct pci_dev *dev, int bar, unsigned long offset, unsigned long maxlen) { resource_size_t start = pci_resource_start(dev, bar); resource_size_t len = pci_resource_len(dev, bar); unsigned long flags = pci_resource_flags(dev, bar); if (len <= offset || !start) return NULL; len -= offset; start += offset; if (maxlen && len > maxlen) len = maxlen; if (flags & IORESOURCE_IO) return __pci_ioport_map(dev, start, len); if (flags & IORESOURCE_MEM) return ioremap(start, len); /* What? */ return NULL; }

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PersonTokensPropCommitsCommitProp
Michael S. Tsirkin120100.00%3100.00%
Total120100.00%3100.00%

EXPORT_SYMBOL(pci_iomap_range); /** * pci_iomap_wc_range - create a virtual WC mapping cookie for a PCI BAR * @dev: PCI device that owns the BAR * @bar: BAR number * @offset: map memory at the given offset in BAR * @maxlen: max length of the memory to map * * Using this function you will get a __iomem address to your device BAR. * You can access it using ioread*() and iowrite*(). These functions hide * the details if this is a MMIO or PIO address space and will just do what * you expect from them in the correct way. When possible write combining * is used. * * @maxlen specifies the maximum length to map. If you want to get access to * the complete BAR from offset to the end, pass %0 here. * */
void __iomem *pci_iomap_wc_range(struct pci_dev *dev, int bar, unsigned long offset, unsigned long maxlen) { resource_size_t start = pci_resource_start(dev, bar); resource_size_t len = pci_resource_len(dev, bar); unsigned long flags = pci_resource_flags(dev, bar); if (flags & IORESOURCE_IO) return NULL; if (len <= offset || !start) return NULL; len -= offset; start += offset; if (maxlen && len > maxlen) len = maxlen; if (flags & IORESOURCE_MEM) return ioremap_wc(start, len); /* What? */ return NULL; }

Contributors

PersonTokensPropCommitsCommitProp
Luis R. Rodriguez113100.00%1100.00%
Total113100.00%1100.00%

EXPORT_SYMBOL_GPL(pci_iomap_wc_range); /** * pci_iomap - create a virtual mapping cookie for a PCI BAR * @dev: PCI device that owns the BAR * @bar: BAR number * @maxlen: length of the memory to map * * Using this function you will get a __iomem address to your device BAR. * You can access it using ioread*() and iowrite*(). These functions hide * the details if this is a MMIO or PIO address space and will just do what * you expect from them in the correct way. * * @maxlen specifies the maximum length to map. If you want to get access to * the complete BAR without checking for its length first, pass %0 here. * */
void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen) { return pci_iomap_range(dev, bar, 0, maxlen); }

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PersonTokensPropCommitsCommitProp
Michael S. Tsirkin31100.00%1100.00%
Total31100.00%1100.00%

EXPORT_SYMBOL(pci_iomap); /** * pci_iomap_wc - create a virtual WC mapping cookie for a PCI BAR * @dev: PCI device that owns the BAR * @bar: BAR number * @maxlen: length of the memory to map * * Using this function you will get a __iomem address to your device BAR. * You can access it using ioread*() and iowrite*(). These functions hide * the details if this is a MMIO or PIO address space and will just do what * you expect from them in the correct way. When possible write combining * is used. * * @maxlen specifies the maximum length to map. If you want to get access to * the complete BAR without checking for its length first, pass %0 here. * */
void __iomem *pci_iomap_wc(struct pci_dev *dev, int bar, unsigned long maxlen) { return pci_iomap_wc_range(dev, bar, 0, maxlen); }

Contributors

PersonTokensPropCommitsCommitProp
Luis R. Rodriguez31100.00%1100.00%
Total31100.00%1100.00%

EXPORT_SYMBOL_GPL(pci_iomap_wc); #endif /* CONFIG_PCI */

Overall Contributors

PersonTokensPropCommitsCommitProp
Michael S. Tsirkin17953.43%375.00%
Luis R. Rodriguez15646.57%125.00%
Total335100.00%4100.00%
Directory: lib
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