mirror of
https://github.com/torvalds/linux.git
synced 2024-11-05 11:32:04 +00:00
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.
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1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=o57/
-----END PGP SIGNATURE-----
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
/*
|
|
* 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 */
|