linux-kernel - [PATCH v2 0/3] phase out CONFIG_VIRT_TO

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Message-Id: <20220617125750.728590-1-arnd@kernel.org>
Date:   Fri, 17 Jun 2022 14:57:47 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Arnd Bergmann <arnd@...db.de>, Jakub Kicinski <kuba@...nel.org>,
        Christoph Hellwig <hch@...radead.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        iommu@...ts.linux-foundation.org,
        Khalid Aziz <khalid@...ehiking.org>,
        "Maciej W . Rozycki" <macro@...am.me.uk>,
        Matt Wang <wwentao@...are.com>,
        Miquel van Smoorenburg <mikevs@...all.net>,
        Mark Salyzyn <salyzyn@...roid.com>,
        linuxppc-dev@...ts.ozlabs.org, linux-arch@...r.kernel.org,
        linux-alpha@...r.kernel.org, linux-m68k@...ts.linux-m68k.org,
        linux-parisc@...r.kernel.org, Denis Efremov <efremov@...ux.com>
Subject: [PATCH v2 0/3] phase out CONFIG_VIRT_TO_BUS

From: Arnd Bergmann <arnd@...db.de>

The virt_to_bus/bus_to_virt interface has been deprecated for
decades. After Jakub Kicinski put a lot of work into cleaning out the
network drivers using them, there are only a couple of other drivers
left, which can all be removed or otherwise cleaned up, to remove the
old interface for good.

Any out of tree drivers using virt_to_bus() should be converted to
using the dma-mapping interfaces, typically dma_alloc_coherent()
or dma_map_single()).

There are a few m68k and ppc32 specific drivers that keep using the
interfaces, but these are all guarded with architecture-specific
Kconfig dependencies, and are not actually broken.

There are still a number of drivers that are using virt_to_phys()
and phys_to_virt() in place of dma-mapping operations, and these
are often broken, but they are out of scope for this series.

I would like the first two patches to either get merged through
the SCSI tree, or get an Ack from the SCSI maintainers so I can
merge them through the asm-generic tree

      Arnd

---
Changes since v1:
 - dropped VME patches that are already in staging-next
 - dropped media patch that gets merged independently
 - added a networking patch and dropped it again after it got merged
 - replace BusLogic removal with a workaround

Cc: Jakub Kicinski <kuba@...nel.org>
Cc: Christoph Hellwig <hch@...radead.org> # dma-mapping
Cc: Marek Szyprowski <m.szyprowski@...sung.com> # dma-mapping
Cc: Robin Murphy <robin.murphy@....com> # dma-mapping
Cc: iommu@...ts.linux-foundation.org
Cc: Khalid Aziz <khalid@...ehiking.org> # buslogic
Cc: Maciej W. Rozycki <macro@...am.me.uk> # buslogic
Cc: Matt Wang <wwentao@...are.com> # buslogic
Cc: Miquel van Smoorenburg <mikevs@...all.net> # dpt_i2o
Cc: Mark Salyzyn <salyzyn@...roid.com> # dpt_i2o
Cc: linux-scsi@...r.kernel.org
Cc: linuxppc-dev@...ts.ozlabs.org
Cc: linux-arch@...r.kernel.org
Cc: linux-alpha@...r.kernel.org
Cc: linux-m68k@...ts.linux-m68k.org
Cc: linux-parisc@...r.kernel.org
Cc: Denis Efremov <efremov@...ux.com> # floppy

Arnd Bergmann (3):
  scsi: dpt_i2o: drop stale VIRT_TO_BUS dependency
  scsi: BusLogic remove bus_to_virt
  arch/*/: remove CONFIG_VIRT_TO_BUS

 .../core-api/bus-virt-phys-mapping.rst        | 220 ------------------
 Documentation/core-api/dma-api-howto.rst      |  14 --
 Documentation/core-api/index.rst              |   1 -
 .../translations/zh_CN/core-api/index.rst     |   1 -
 arch/alpha/Kconfig                            |   1 -
 arch/alpha/include/asm/floppy.h               |   2 +-
 arch/alpha/include/asm/io.h                   |   8 +-
 arch/ia64/Kconfig                             |   1 -
 arch/ia64/include/asm/io.h                    |   8 -
 arch/m68k/Kconfig                             |   1 -
 arch/m68k/include/asm/virtconvert.h           |   4 +-
 arch/microblaze/Kconfig                       |   1 -
 arch/microblaze/include/asm/io.h              |   2 -
 arch/mips/Kconfig                             |   1 -
 arch/mips/include/asm/io.h                    |   9 -
 arch/parisc/Kconfig                           |   1 -
 arch/parisc/include/asm/floppy.h              |   4 +-
 arch/parisc/include/asm/io.h                  |   2 -
 arch/powerpc/Kconfig                          |   1 -
 arch/powerpc/include/asm/io.h                 |   2 -
 arch/riscv/include/asm/page.h                 |   1 -
 arch/x86/Kconfig                              |   1 -
 arch/x86/include/asm/io.h                     |   9 -
 arch/xtensa/Kconfig                           |   1 -
 arch/xtensa/include/asm/io.h                  |   3 -
 drivers/scsi/BusLogic.c                       |  27 ++-
 drivers/scsi/Kconfig                          |   4 +-
 drivers/scsi/dpt_i2o.c                        |   4 +-
 include/asm-generic/io.h                      |  14 --
 mm/Kconfig                                    |   8 -
 30 files changed, 30 insertions(+), 326 deletions(-)
 delete mode 100644 Documentation/core-api/bus-virt-phys-mapping.rst

-- 
2.29.2