linux-toradex.git/include/linux/ioport.h, branch v3.10.2

resource: add release_mem_region_adjustable()

2013-04-29T22:54:37+00:00

Add release_mem_region_adjustable(), which releases a requested region
from a currently busy memory resource.  This interface adjusts the
matched memory resource accordingly even if the requested region does
not match exactly but still fits into.

This new interface is intended for memory hot-delete.  During bootup,
memory resources are inserted from the boot descriptor table, such as
EFI Memory Table and e820.  Each memory resource entry usually covers
the whole contigous memory range.  Memory hot-delete request, on the
other hand, may target to a particular range of memory resource, and its
size can be much smaller than the whole contiguous memory.  Since the
existing release interfaces like __release_region() require a requested
region to be exactly matched to a resource entry, they do not allow a
partial resource to be released.

This new interface is restrictive (i.e.  release under certain
conditions), which is consistent with other release interfaces,
__release_region() and __release_resource().  Additional release
conditions, such as an overlapping region to a resource entry, can be
supported after they are confirmed as valid cases.

There is no change to the existing interfaces since their restriction is
valid for I/O resources.

[akpm@linux-foundation.org: use GFP_ATOMIC under write_lock()]
[akpm@linux-foundation.org: switch back to GFP_KERNEL, less buggily]
[akpm@linux-foundation.org: remove unneeded and wrong kfree(), per Toshi]
Signed-off-by: Toshi Kani 
Reviewed-by : Yasuaki Ishimatsu 
Cc: David Rientjes 
Reviewed-by: Ram Pai 
Cc: T Makphaibulchoke 
Cc: Wen Congyang 
Cc: Tang Chen 
Cc: Jiang Liu 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

resources: Document IORESOURCE_IO

2012-09-11T08:15:02+00:00

Help clarify that this is specifically for PCI/ISA I/O ports and not for
any other similar thing.

Signed-off-by: Mark Brown 
Acked-by: Arnd Bergmann 
Acked-by: Haojian Zhuang 
Tested-by: Haojian Zhuang 
Signed-off-by: Samuel Ortiz

resources: Add register address resource type

2012-09-11T08:15:02+00:00

Currently a bunch of I2C/SPI MFD drivers are using IORESOURCE_IO for
register address ranges. Since this causes some confusion due to the
primary use of this resource type for PCI/ISA I/O ports create a new
resource type IORESOURCE_REG.

Unfortunately the current resource types are specified as bitmasks and
there are no free bitmasks even though they really shouldn't be used as
such so we define the new type as IORESOURCE_IO | IORESOURCE_MEM.
Benjamin Herrenschmidt and Russell King have both verified that none of
the users in this series will have a problem with this, and no new code
should be affected.

This patch was written by Russell King but he found himself unable to
take the patch further.

Signed-off-by: Mark Brown 
Acked-by: Arnd Bergmann 
Acked-by: Haojian Zhuang 
Tested-by: Haojian Zhuang 
Signed-off-by: Samuel Ortiz

resources: add resource_overlaps()

2012-05-07T16:58:57+00:00

Add resource_overlaps(), which returns true if two resources overlap at all.

Use this to replace the complicated check in coalesce_windows().

Signed-Off-By: Wei Yang 
Signed-off-by: Bjorn Helgaas

PCI: Move struct resource_list to setup-bus.c

2012-02-14T16:44:55+00:00

No user outside of setup-bus.c now.  Later patches will convert
resource_list to a regular list.

Suggested-by: Linus Torvalds 
Signed-off-by: Yinghai Lu 
Signed-off-by: Jesse Barnes

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k

2011-08-01T00:30:59+00:00

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k:
  m68k/math-emu: Remove unnecessary code
  m68k/math-emu: Remove commented out old code
  m68k: Kill warning in setup_arch() when compiling for Sun3
  m68k/atari: Prefix GPIO_{IN,OUT} with CODEC_
  sparc: iounmap() and *_free_coherent() - Use lookup_resource()
  m68k/atari: Reserve some ST-RAM early on for device buffer use
  m68k/amiga: Chip RAM - Use lookup_resource()
  resources: Add lookup_resource()
  sparc: _sparc_find_resource() should check for exact matches
  m68k/amiga: Chip RAM - Offset resource end by CHIP_PHYSADDR
  m68k/amiga: Chip RAM - Use resource_size() to fix off-by-one error
  m68k/amiga: Chip RAM - Change chipavail to an atomic_t
  m68k/amiga: Chip RAM - Always allocate from the start of memory
  m68k/amiga: Chip RAM - Convert from printk() to pr_*()
  m68k/amiga: Chip RAM - Use tabs for indentation

resources: Add lookup_resource()

2011-07-30T19:21:39+00:00

Add a function to find an existing resource by a resource start address.
This allows to implement simple allocators (with a malloc/free-alike API)
on top of the resource system.

Signed-off-by: Geert Uytterhoeven

include/linux/ioport.h: new helper to define common struct resource constructs

2011-07-26T03:57:14+00:00

Resource definitions that just define start, end and flags =
IORESOURCE_MEM or IORESOURCE_IRQ (with start=end) are quite common.  So
introduce a shortcut for them.  For completeness add macros for
IORESOURCE_DMA and IORESOURCE_IO, too and also make available a set of
macros to specify named resources of all types which are less common.

Signed-off-by: Uwe Kleine-König 
Cc: Arnd Bergmann 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

resources: add arch hook for preventing allocation in reserved areas

2010-12-17T18:01:09+00:00

This adds arch_remove_reservations(), which an arch can implement if it
needs to protect part of the address space from allocation.

Sometimes that can be done by just putting a region in the resource tree,
but there are cases where that doesn't work well.  For example, x86 BIOS
E820 reservations are not related to devices, so they may overlap part of,
all of, or more than a device resource, so they may not end up at the
correct spot in the resource tree.

Acked-by: H. Peter Anvin 
Signed-off-by: Bjorn Helgaas 
Signed-off-by: Jesse Barnes

Revert "resources: support allocating space within a region from the top down"

2010-12-17T18:00:59+00:00

This reverts commit e7f8567db9a7f6b3151b0b275e245c1cef0d9c70.

Acked-by: H. Peter Anvin 
Signed-off-by: Bjorn Helgaas 
Signed-off-by: Jesse Barnes