[PATCH 0/6] pmem, dax: I/O path enhancements
by Ross Zwisler
Patch 5 adds support for the "read flush" _DSM flag, allowing us to change the
ND BLK aperture mapping from write-combining to write-back via memremap_pmem().
Patch 6 updates the DAX I/O path so that all operations that store data (I/O
writes, zeroing blocks, punching holes, etc.) properly synchronize the stores
to media using the PMEM API. This ensures that the data DAX is writing is
durable on media before the operation completes.
Patches 1-4 are cleanup patches and additions to the PMEM API that make
patches 5 and 6 possible.
Regarding the choice to add both flush_cache_pmem() and wb_cache_pmem() to the
PMEM API, I had initially implemented flush_cache_pmem() as a generic function
flush_io_cache_range() in the spirit of flush_cache_range(), etc., in
cacheflush.h. I eventually moved it into the PMEM API because a) it has a
common and consistent use of the __pmem annotation, b) it has a clear fallback
method for architectures that don't support it, as opposed to APIs in
cacheflush.h which would need to be added individually to all other
architectures. It can be argued that the flush API could apply to other uses
beyond PMEM such as flushing cache lines associated with other types of
sliding MMIO windows. At this point I'm inclined to have it as part of the
PMEM API, and then take on the effort of making it a general cache flusing API
if other users come along.
Ross Zwisler (6):
pmem: remove indirection layer arch_has_pmem_api()
x86: clean up conditional pmem includes
x86: add clwb_cache_range()
pmem: Add wb_cache_pmem() and flush_cache_pmem()
nd_blk: add support for "read flush" DSM flag
dax: update I/O path to do proper PMEM flushing
arch/x86/include/asm/cacheflush.h | 24 +++++++++--------
arch/x86/mm/pageattr.c | 23 ++++++++++++++++
drivers/acpi/nfit.c | 18 ++++++-------
drivers/acpi/nfit.h | 6 ++++-
fs/dax.c | 55 +++++++++++++++++++++++++++++++--------
include/linux/pmem.h | 36 ++++++++++++++++++-------
6 files changed, 120 insertions(+), 42 deletions(-)
--
2.1.0
6 years, 3 months
- 4
- 18
[PATCH v3 00/24] replace ioremap_{cache|wt} with memremap
by Dan Williams
Changes since v2 [1]:
1/ Move arch_memremap() and arch_memunmap() out of line (Christoph)
2/ Convert region_is_ram() to region_intersects() and define an enum for
its 3 return values. (Luis)
3/ Fix gma500 and i915 to explicitly use cached mappings and clean up
the __iomem usage. (Daniel)
4/ Kill unused ioremap aliases (ioremap_cached() and
ioremap_fullcache()) (Christoph)
5/ Clarify some change logs and documentation (Luis, Christoph, and
Ross)
6/ Add a unified CONFIG_MMU=n implementation with __weak symbols. (Luis)
---
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-arch&m=143779222217405&w=2
---
Dan Williams (24):
mm: enhance region_is_ram() to region_intersects()
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 memremap
i915: switch from acpi_os_ioremap to memremap
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: push call to ioremap_cache out of line
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: kill ioremap_cached()
arch: kill ioremap_fullcache()
arch: remove ioremap_cache, replace with arch_memremap
arch: remove ioremap_wt, optionally replace with arch_memremap
pmem: convert to generic memremap
Documentation/x86/pat.txt | 6 +
arch/arc/include/asm/io.h | 1
arch/arm/Kconfig | 1
arch/arm/include/asm/io.h | 7 --
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 | 18 +++-
arch/arm/mm/mmu.c | 2
arch/arm/mm/nommu.c | 11 ++
arch/arm64/Kconfig | 1
arch/arm64/include/asm/acpi.h | 11 --
arch/arm64/include/asm/dmi.h | 8 +-
arch/arm64/include/asm/io.h | 2
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/include/asm/io.h | 12 ---
arch/ia64/Kconfig | 1
arch/ia64/include/asm/io.h | 5 -
arch/ia64/kernel/cyclone.c | 2
arch/ia64/mm/ioremap.c | 16 +++
arch/m32r/include/asm/io.h | 1
arch/m68k/Kconfig | 1
arch/m68k/include/asm/io_mm.h | 12 ---
arch/m68k/include/asm/io_no.h | 11 --
arch/m68k/include/asm/raw_io.h | 1
arch/m68k/mm/kmap.c | 17 +++-
arch/m68k/mm/sun3kmap.c | 6 +
arch/metag/include/asm/io.h | 6 -
arch/microblaze/include/asm/io.h | 2
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 | 6 -
arch/sh/mm/ioremap.c | 15 +++
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 | 2
arch/unicore32/include/asm/io.h | 4 -
arch/unicore32/mm/ioremap.c | 8 --
arch/x86/Kconfig | 1
arch/x86/include/asm/efi.h | 3 -
arch/x86/include/asm/io.h | 11 --
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 | 59 +++++++------
arch/xtensa/include/asm/io.h | 11 --
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 | 8 +-
drivers/gpu/drm/gma500/psb_drv.h | 2
drivers/gpu/drm/gma500/psb_lid.c | 8 +-
drivers/gpu/drm/i915/i915_debugfs.c | 2
drivers/gpu/drm/i915/i915_drv.h | 12 +--
drivers/gpu/drm/i915/intel_bios.c | 7 +-
drivers/gpu/drm/i915/intel_opregion.c | 87 +++++++++----------
drivers/gpu/drm/i915/intel_panel.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 | 11 ++
include/linux/mm.h | 9 ++
include/linux/mtd/map.h | 2
include/linux/pmem.h | 26 +++---
include/video/vga.h | 2
kernel/Makefile | 2
kernel/memremap.c | 110 ++++++++++++++++++++++++
kernel/resource.c | 61 ++++++++-----
lib/Kconfig | 5 +
lib/devres.c | 13 +--
lib/pci_iomap.c | 7 --
tools/testing/nvdimm/Kbuild | 4 -
tools/testing/nvdimm/test/iomap.c | 34 +++++--
110 files changed, 553 insertions(+), 497 deletions(-)
create mode 100644 kernel/memremap.c
6 years, 3 months
- 5
- 37