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https://github.com/brain-hackers/linux-brain.git
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12f03ee606
1/ Introduce ZONE_DEVICE and devm_memremap_pages() as a generic
mechanism for adding device-driver-discovered memory regions to the
kernel's direct map. This facility is used by the pmem driver to
enable pfn_to_page() operations on the page frames returned by DAX
('direct_access' in 'struct block_device_operations'). For now, the
'memmap' allocation for these "device" pages comes from "System
RAM". Support for allocating the memmap from device memory will
arrive in a later kernel.
2/ Introduce memremap() to replace usages of ioremap_cache() and
ioremap_wt(). memremap() drops the __iomem annotation for these
mappings to memory that do not have i/o side effects. The
replacement of ioremap_cache() with memremap() is limited to the
pmem driver to ease merging the api change in v4.3. Completion of
the conversion is targeted for v4.4.
3/ Similar to the usage of memcpy_to_pmem() + wmb_pmem() in the pmem
driver, update the VFS DAX implementation and PMEM api to provide
persistence guarantees for kernel operations on a DAX mapping.
4/ Convert the ACPI NFIT 'BLK' driver to map the block apertures as
cacheable to improve performance.
5/ Miscellaneous updates and fixes to libnvdimm including support
for issuing "address range scrub" commands, clarifying the optimal
'sector size' of pmem devices, a clarification of the usage of the
ACPI '_STA' (status) property for DIMM devices, and other minor
fixes.
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Merge tag 'libnvdimm-for-4.3' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm
Pull libnvdimm updates from Dan Williams:
"This update has successfully completed a 0day-kbuild run and has
appeared in a linux-next release. The changes outside of the typical
drivers/nvdimm/ and drivers/acpi/nfit.[ch] paths are related to the
removal of IORESOURCE_CACHEABLE, the introduction of memremap(), and
the introduction of ZONE_DEVICE + devm_memremap_pages().
Summary:
- Introduce ZONE_DEVICE and devm_memremap_pages() as a generic
mechanism for adding device-driver-discovered memory regions to the
kernel's direct map.
This facility is used by the pmem driver to enable pfn_to_page()
operations on the page frames returned by DAX ('direct_access' in
'struct block_device_operations').
For now, the 'memmap' allocation for these "device" pages comes
from "System RAM". Support for allocating the memmap from device
memory will arrive in a later kernel.
- Introduce memremap() to replace usages of ioremap_cache() and
ioremap_wt(). memremap() drops the __iomem annotation for these
mappings to memory that do not have i/o side effects. The
replacement of ioremap_cache() with memremap() is limited to the
pmem driver to ease merging the api change in v4.3.
Completion of the conversion is targeted for v4.4.
- Similar to the usage of memcpy_to_pmem() + wmb_pmem() in the pmem
driver, update the VFS DAX implementation and PMEM api to provide
persistence guarantees for kernel operations on a DAX mapping.
- Convert the ACPI NFIT 'BLK' driver to map the block apertures as
cacheable to improve performance.
- Miscellaneous updates and fixes to libnvdimm including support for
issuing "address range scrub" commands, clarifying the optimal
'sector size' of pmem devices, a clarification of the usage of the
ACPI '_STA' (status) property for DIMM devices, and other minor
fixes"
* tag 'libnvdimm-for-4.3' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm: (34 commits)
libnvdimm, pmem: direct map legacy pmem by default
libnvdimm, pmem: 'struct page' for pmem
libnvdimm, pfn: 'struct page' provider infrastructure
x86, pmem: clarify that ARCH_HAS_PMEM_API implies PMEM mapped WB
add devm_memremap_pages
mm: ZONE_DEVICE for "device memory"
mm: move __phys_to_pfn and __pfn_to_phys to asm/generic/memory_model.h
dax: drop size parameter to ->direct_access()
nd_blk: change aperture mapping from WC to WB
nvdimm: change to use generic kvfree()
pmem, dax: have direct_access use __pmem annotation
dax: update I/O path to do proper PMEM flushing
pmem: add copy_from_iter_pmem() and clear_pmem()
pmem, x86: clean up conditional pmem includes
pmem: remove layer when calling arch_has_wmb_pmem()
pmem, x86: move x86 PMEM API to new pmem.h header
libnvdimm, e820: make CONFIG_X86_PMEM_LEGACY a tristate option
pmem: switch to devm_ allocations
devres: add devm_memremap
libnvdimm, btt: write and validate parent_uuid
...
137 lines
4.2 KiB
C
137 lines
4.2 KiB
C
/*
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* Implement the default iomap interfaces
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*
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* (C) Copyright 2004 Linus Torvalds
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*/
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#include <linux/pci.h>
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#include <linux/io.h>
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#include <linux/export.h>
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#ifdef CONFIG_PCI
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/**
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* pci_iomap_range - create a virtual mapping cookie for a PCI BAR
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* @dev: PCI device that owns the BAR
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* @bar: BAR number
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* @offset: map memory at the given offset in BAR
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* @maxlen: max length of the memory to map
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*
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* Using this function you will get a __iomem address to your device BAR.
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* You can access it using ioread*() and iowrite*(). These functions hide
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* the details if this is a MMIO or PIO address space and will just do what
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* you expect from them in the correct way.
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*
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* @maxlen specifies the maximum length to map. If you want to get access to
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* the complete BAR from offset to the end, pass %0 here.
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* */
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void __iomem *pci_iomap_range(struct pci_dev *dev,
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int bar,
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unsigned long offset,
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unsigned long maxlen)
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{
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resource_size_t start = pci_resource_start(dev, bar);
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resource_size_t len = pci_resource_len(dev, bar);
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unsigned long flags = pci_resource_flags(dev, bar);
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if (len <= offset || !start)
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return NULL;
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len -= offset;
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start += offset;
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if (maxlen && len > maxlen)
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len = maxlen;
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if (flags & IORESOURCE_IO)
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return __pci_ioport_map(dev, start, len);
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if (flags & IORESOURCE_MEM)
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return ioremap(start, len);
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/* What? */
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return NULL;
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}
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EXPORT_SYMBOL(pci_iomap_range);
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/**
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* pci_iomap_wc_range - create a virtual WC mapping cookie for a PCI BAR
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* @dev: PCI device that owns the BAR
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* @bar: BAR number
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* @offset: map memory at the given offset in BAR
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* @maxlen: max length of the memory to map
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*
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* Using this function you will get a __iomem address to your device BAR.
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* You can access it using ioread*() and iowrite*(). These functions hide
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* the details if this is a MMIO or PIO address space and will just do what
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* you expect from them in the correct way. When possible write combining
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* is used.
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*
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* @maxlen specifies the maximum length to map. If you want to get access to
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* the complete BAR from offset to the end, pass %0 here.
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* */
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void __iomem *pci_iomap_wc_range(struct pci_dev *dev,
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int bar,
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unsigned long offset,
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unsigned long maxlen)
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{
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resource_size_t start = pci_resource_start(dev, bar);
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resource_size_t len = pci_resource_len(dev, bar);
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unsigned long flags = pci_resource_flags(dev, bar);
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if (flags & IORESOURCE_IO)
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return NULL;
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if (len <= offset || !start)
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return NULL;
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len -= offset;
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start += offset;
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if (maxlen && len > maxlen)
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len = maxlen;
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if (flags & IORESOURCE_MEM)
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return ioremap_wc(start, len);
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/* What? */
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return NULL;
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}
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EXPORT_SYMBOL_GPL(pci_iomap_wc_range);
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/**
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* pci_iomap - create a virtual mapping cookie for a PCI BAR
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* @dev: PCI device that owns the BAR
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* @bar: BAR number
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* @maxlen: length of the memory to map
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*
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* Using this function you will get a __iomem address to your device BAR.
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* You can access it using ioread*() and iowrite*(). These functions hide
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* the details if this is a MMIO or PIO address space and will just do what
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* you expect from them in the correct way.
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*
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* @maxlen specifies the maximum length to map. If you want to get access to
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* the complete BAR without checking for its length first, pass %0 here.
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* */
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void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
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{
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return pci_iomap_range(dev, bar, 0, maxlen);
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}
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EXPORT_SYMBOL(pci_iomap);
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/**
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* pci_iomap_wc - create a virtual WC mapping cookie for a PCI BAR
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* @dev: PCI device that owns the BAR
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* @bar: BAR number
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* @maxlen: length of the memory to map
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*
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* Using this function you will get a __iomem address to your device BAR.
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* You can access it using ioread*() and iowrite*(). These functions hide
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* the details if this is a MMIO or PIO address space and will just do what
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* you expect from them in the correct way. When possible write combining
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* is used.
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*
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* @maxlen specifies the maximum length to map. If you want to get access to
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* the complete BAR without checking for its length first, pass %0 here.
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* */
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void __iomem *pci_iomap_wc(struct pci_dev *dev, int bar, unsigned long maxlen)
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{
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return pci_iomap_wc_range(dev, bar, 0, maxlen);
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}
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EXPORT_SYMBOL_GPL(pci_iomap_wc);
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#endif /* CONFIG_PCI */
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