[PATCH v2 00/25] replace ioremap_{cache|wt} with memremap

Dan Williams dan.j.williams at intel.com
Fri Jul 24 19:37:54 PDT 2015


Changes since v1 [1]:

1/ Drop the attempt at unifying ioremap() prototypes, just focus on
   converting ioremap_cache and ioremap_wt over to memremap (Christoph)

2/ Drop the unrelated cleanups to use %pa in __ioremap_caller (Thomas)

3/ Add support for memremap() attempts on "System RAM" to simply return
   the kernel virtual address for that range.  ARM depends on this
   functionality in ioremap_cache() and ACPI was open coding a similar
   solution. (Mark)

4/ Split the conversions of ioremap_{cache|wt} into separate patches per
   driver / arch.

5/ Fix bisection breakage and other reports from 0day-kbuild

---
While developing the pmem driver we noticed that the __iomem annotation
on the return value from ioremap_cache() was being mishandled by several
callers.  We also observed that all of the call sites expected to be
able to treat the return value from ioremap_cache() as normal
(non-__iomem) pointer to memory.

This patchset takes the opportunity to clean up the above confusion as
well as a few issues with the ioremap_{cache|wt} interface, including:

1/ Eliminating the possibility of function prototypes differing between
   architectures by defining a central memremap() prototype that takes
   flags to determine the mapping type.

2/ Returning NULL rather than falling back silently to a different
   mapping-type.  This allows drivers to be stricter about the
   mapping-type fallbacks that are permissible.

[1]: http://marc.info/?l=linux-arm-kernel&m=143735199029255&w=2

---

Dan Williams (22):
      mm: enhance region_is_ram() to distinguish 'unknown' vs 'mixed'
      arch, drivers: don't include <asm/io.h> directly, use <linux/io.h> instead
      cleanup IORESOURCE_CACHEABLE vs ioremap()
      intel_iommu: fix leaked ioremap mapping
      arch: introduce memremap()
      arm: switch from ioremap_cache to memremap
      x86: switch from ioremap_cache to memremap
      gma500: switch from acpi_os_ioremap to ioremap
      i915: switch from acpi_os_ioremap to ioremap
      acpi: switch from ioremap_cache to memremap
      toshiba laptop: replace ioremap_cache with ioremap
      memconsole: fix __iomem mishandling, switch to memremap
      visorbus: switch from ioremap_cache to memremap
      intel-iommu: switch from ioremap_cache to memremap
      libnvdimm, pmem: switch from ioremap_cache to memremap
      pxa2xx-flash: switch from ioremap_cache to memremap
      sfi: switch from ioremap_cache to memremap
      fbdev: switch from ioremap_wt to memremap
      pmem: switch from ioremap_wt to memremap
      arch: remove ioremap_cache, replace with arch_memremap
      arch: remove ioremap_wt, replace with arch_memremap
      pmem: convert to generic memremap

Toshi Kani (3):
      mm, x86: Fix warning in ioremap RAM check
      mm, x86: Remove region_is_ram() call from ioremap
      mm: Fix bugs in region_is_ram()


 arch/arc/include/asm/io.h                      |    1 
 arch/arm/Kconfig                               |    1 
 arch/arm/include/asm/io.h                      |   13 +++-
 arch/arm/include/asm/xen/page.h                |    4 +
 arch/arm/mach-clps711x/board-cdb89712.c        |    2 -
 arch/arm/mach-shmobile/pm-rcar.c               |    2 -
 arch/arm/mm/ioremap.c                          |   12 +++-
 arch/arm/mm/nommu.c                            |   11 ++-
 arch/arm64/Kconfig                             |    1 
 arch/arm64/include/asm/acpi.h                  |   10 +--
 arch/arm64/include/asm/dmi.h                   |    8 +--
 arch/arm64/include/asm/io.h                    |    8 ++-
 arch/arm64/kernel/efi.c                        |    9 ++-
 arch/arm64/kernel/smp_spin_table.c             |   19 +++---
 arch/arm64/mm/ioremap.c                        |   20 ++----
 arch/avr32/include/asm/io.h                    |    1 
 arch/frv/Kconfig                               |    1 
 arch/frv/include/asm/io.h                      |   17 ++---
 arch/frv/mm/kmap.c                             |    6 ++
 arch/ia64/Kconfig                              |    1 
 arch/ia64/include/asm/io.h                     |   11 +++
 arch/ia64/kernel/cyclone.c                     |    2 -
 arch/m32r/include/asm/io.h                     |    1 
 arch/m68k/Kconfig                              |    1 
 arch/m68k/include/asm/io_mm.h                  |   14 +---
 arch/m68k/include/asm/io_no.h                  |   12 ++--
 arch/m68k/include/asm/raw_io.h                 |    4 +
 arch/m68k/mm/kmap.c                            |   17 +++++
 arch/m68k/mm/sun3kmap.c                        |    6 ++
 arch/metag/include/asm/io.h                    |    3 -
 arch/microblaze/include/asm/io.h               |    1 
 arch/mn10300/include/asm/io.h                  |    1 
 arch/nios2/include/asm/io.h                    |    1 
 arch/powerpc/kernel/pci_of_scan.c              |    2 -
 arch/s390/include/asm/io.h                     |    1 
 arch/sh/Kconfig                                |    1 
 arch/sh/include/asm/io.h                       |   20 ++++--
 arch/sh/mm/ioremap.c                           |   10 +++
 arch/sparc/include/asm/io_32.h                 |    1 
 arch/sparc/include/asm/io_64.h                 |    1 
 arch/sparc/kernel/pci.c                        |    3 -
 arch/tile/include/asm/io.h                     |    1 
 arch/x86/Kconfig                               |    1 
 arch/x86/include/asm/efi.h                     |    3 +
 arch/x86/include/asm/io.h                      |   17 +++--
 arch/x86/kernel/crash_dump_64.c                |    6 +-
 arch/x86/kernel/kdebugfs.c                     |    8 +--
 arch/x86/kernel/ksysfs.c                       |   28 ++++-----
 arch/x86/mm/ioremap.c                          |   76 ++++++++++--------------
 arch/xtensa/Kconfig                            |    1 
 arch/xtensa/include/asm/io.h                   |    9 ++-
 drivers/acpi/apei/einj.c                       |    9 ++-
 drivers/acpi/apei/erst.c                       |    6 +-
 drivers/acpi/nvs.c                             |    6 +-
 drivers/acpi/osl.c                             |   70 ++++++----------------
 drivers/char/toshiba.c                         |    2 -
 drivers/firmware/google/memconsole.c           |    7 +-
 drivers/gpu/drm/gma500/opregion.c              |    2 -
 drivers/gpu/drm/i915/intel_opregion.c          |    2 -
 drivers/iommu/intel-iommu.c                    |   10 ++-
 drivers/iommu/intel_irq_remapping.c            |    4 +
 drivers/isdn/icn/icn.h                         |    2 -
 drivers/mtd/devices/slram.c                    |    2 -
 drivers/mtd/maps/pxa2xx-flash.c                |    4 +
 drivers/mtd/nand/diskonchip.c                  |    2 -
 drivers/mtd/onenand/generic.c                  |    2 -
 drivers/nvdimm/Kconfig                         |    2 -
 drivers/pci/probe.c                            |    3 -
 drivers/pnp/manager.c                          |    2 -
 drivers/scsi/aic94xx/aic94xx_init.c            |    7 --
 drivers/scsi/arcmsr/arcmsr_hba.c               |    5 --
 drivers/scsi/mvsas/mv_init.c                   |   15 +----
 drivers/scsi/sun3x_esp.c                       |    2 -
 drivers/sfi/sfi_core.c                         |    4 +
 drivers/staging/comedi/drivers/ii_pci20kc.c    |    1 
 drivers/staging/unisys/visorbus/visorchannel.c |   16 +++--
 drivers/staging/unisys/visorbus/visorchipset.c |   17 +++--
 drivers/tty/serial/8250/8250_core.c            |    2 -
 drivers/video/fbdev/Kconfig                    |    2 -
 drivers/video/fbdev/amifb.c                    |    5 +-
 drivers/video/fbdev/atafb.c                    |    5 +-
 drivers/video/fbdev/hpfb.c                     |    6 +-
 drivers/video/fbdev/ocfb.c                     |    1 
 drivers/video/fbdev/s1d13xxxfb.c               |    3 -
 drivers/video/fbdev/stifb.c                    |    1 
 include/acpi/acpi_io.h                         |    6 +-
 include/asm-generic/io.h                       |    8 ---
 include/asm-generic/iomap.h                    |    4 -
 include/linux/io-mapping.h                     |    2 -
 include/linux/io.h                             |    9 +++
 include/linux/mtd/map.h                        |    2 -
 include/linux/pmem.h                           |   26 +++++---
 include/video/vga.h                            |    2 -
 kernel/Makefile                                |    2 +
 kernel/memremap.c                              |   74 +++++++++++++++++++++++
 kernel/resource.c                              |   43 +++++++-------
 lib/Kconfig                                    |    5 +-
 lib/devres.c                                   |   13 +---
 lib/pci_iomap.c                                |    7 +-
 tools/testing/nvdimm/Kbuild                    |    4 +
 tools/testing/nvdimm/test/iomap.c              |   34 ++++++++---
 101 files changed, 482 insertions(+), 398 deletions(-)
 create mode 100644 kernel/memremap.c



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