https://github.com/torvalds/linux
Revision c20037652700024cffeb6b0f74306ce9b391248f authored by Linus Torvalds on 07 March 2020, 20:20:29 UTC, committed by Linus Torvalds on 07 March 2020, 20:20:29 UTC
Pull io_uring fixes from Jens Axboe: "Here are a few io_uring fixes that should go into this release. This contains: - Removal of (now) unused io_wq_flush() and associated flag (Pavel) - Fix cancelation lockup with linked timeouts (Pavel) - Fix for potential use-after-free when freeing percpu ref for fixed file sets - io-wq cancelation fixups (Pavel)" * tag 'io_uring-5.6-2020-03-07' of git://git.kernel.dk/linux-block: io_uring: fix lockup with timeouts io_uring: free fixed_file_data after RCU grace period io-wq: remove io_wq_flush and IO_WQ_WORK_INTERNAL io-wq: fix IO_WQ_WORK_NO_CANCEL cancellation
Tip revision: c20037652700024cffeb6b0f74306ce9b391248f authored by Linus Torvalds on 07 March 2020, 20:20:29 UTC
Merge tag 'io_uring-5.6-2020-03-07' of git://git.kernel.dk/linux-block
Merge tag 'io_uring-5.6-2020-03-07' of git://git.kernel.dk/linux-block
Tip revision: c200376
pci_iomap.c
// SPDX-License-Identifier: GPL-2.0
/*
* 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;
}
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;
}
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);
}
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);
}
EXPORT_SYMBOL_GPL(pci_iomap_wc);
#endif /* CONFIG_PCI */
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