mbox series

[0/2] Remove cxl and cxlflash drivers

Message ID 20241210072721.157323-1-ajd@linux.ibm.com (mailing list archive)
Headers show
Series Remove cxl and cxlflash drivers | expand

Message

Andrew Donnellan Dec. 10, 2024, 7:27 a.m. UTC 
This series removes the cxl and cxlflash drivers for IBM CAPI devices.

CAPI devices have been out of production for some time, and we're not
aware of any remaining users who are likely to want a modern kernel.
There's almost certainly some remaining driver bugs and we don't have much
hardware available to properly test the drivers any more. Removing these
drivers will also mean we can get rid of a non-trivial amount of support
code in arch/powerpc.

Thanks to everyone who's worked on these drivers over the last decade.

This series applies on top of [0].

[0] https://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=436003&state=*

Andrew Donnellan (2):
  cxlflash: Remove driver
  cxl: Remove driver

 .../ABI/{obsolete => removed}/sysfs-class-cxl |   55 +-
 Documentation/arch/powerpc/cxl.rst            |  469 --
 Documentation/arch/powerpc/cxlflash.rst       |  433 --
 Documentation/arch/powerpc/index.rst          |    2 -
 .../userspace-api/ioctl/ioctl-number.rst      |    4 +-
 MAINTAINERS                                   |   21 -
 arch/powerpc/configs/skiroot_defconfig        |    1 -
 arch/powerpc/include/asm/copro.h              |    6 -
 arch/powerpc/include/asm/device.h             |    3 -
 arch/powerpc/include/asm/pnv-pci.h            |   17 -
 arch/powerpc/mm/book3s64/hash_native.c        |   13 +-
 arch/powerpc/mm/book3s64/hash_utils.c         |   10 +-
 arch/powerpc/mm/book3s64/pgtable.c            |    1 -
 arch/powerpc/mm/book3s64/slice.c              |    6 +-
 arch/powerpc/mm/copro_fault.c                 |   12 -
 arch/powerpc/platforms/powernv/Makefile       |    1 -
 arch/powerpc/platforms/powernv/pci-cxl.c      |  153 -
 arch/powerpc/platforms/powernv/pci-ioda.c     |   43 -
 arch/powerpc/platforms/powernv/pci.c          |   61 -
 arch/powerpc/platforms/powernv/pci.h          |    2 -
 drivers/misc/Kconfig                          |    1 -
 drivers/misc/Makefile                         |    1 -
 drivers/misc/cxl/Kconfig                      |   28 -
 drivers/misc/cxl/Makefile                     |   14 -
 drivers/misc/cxl/api.c                        |  532 ---
 drivers/misc/cxl/base.c                       |  126 -
 drivers/misc/cxl/context.c                    |  362 --
 drivers/misc/cxl/cxl.h                        | 1135 -----
 drivers/misc/cxl/cxllib.c                     |  271 --
 drivers/misc/cxl/debugfs.c                    |  134 -
 drivers/misc/cxl/fault.c                      |  341 --
 drivers/misc/cxl/file.c                       |  699 ---
 drivers/misc/cxl/flash.c                      |  538 ---
 drivers/misc/cxl/guest.c                      | 1208 -----
 drivers/misc/cxl/hcalls.c                     |  643 ---
 drivers/misc/cxl/hcalls.h                     |  200 -
 drivers/misc/cxl/irq.c                        |  450 --
 drivers/misc/cxl/main.c                       |  383 --
 drivers/misc/cxl/native.c                     | 1592 -------
 drivers/misc/cxl/of.c                         |  346 --
 drivers/misc/cxl/pci.c                        | 2103 ---------
 drivers/misc/cxl/sysfs.c                      |  771 ----
 drivers/misc/cxl/trace.c                      |    9 -
 drivers/misc/cxl/trace.h                      |  691 ---
 drivers/misc/cxl/vphb.c                       |  309 --
 drivers/scsi/Kconfig                          |    1 -
 drivers/scsi/Makefile                         |    1 -
 drivers/scsi/cxlflash/Kconfig                 |   15 -
 drivers/scsi/cxlflash/Makefile                |    5 -
 drivers/scsi/cxlflash/backend.h               |   48 -
 drivers/scsi/cxlflash/common.h                |  340 --
 drivers/scsi/cxlflash/cxl_hw.c                |  177 -
 drivers/scsi/cxlflash/lunmgt.c                |  278 --
 drivers/scsi/cxlflash/main.c                  | 3970 -----------------
 drivers/scsi/cxlflash/main.h                  |  129 -
 drivers/scsi/cxlflash/ocxl_hw.c               | 1399 ------
 drivers/scsi/cxlflash/ocxl_hw.h               |   72 -
 drivers/scsi/cxlflash/sislite.h               |  560 ---
 drivers/scsi/cxlflash/superpipe.c             | 2218 ---------
 drivers/scsi/cxlflash/superpipe.h             |  150 -
 drivers/scsi/cxlflash/vlun.c                  | 1336 ------
 drivers/scsi/cxlflash/vlun.h                  |   82 -
 include/misc/cxl-base.h                       |   48 -
 include/misc/cxl.h                            |  265 --
 include/misc/cxllib.h                         |  129 -
 include/uapi/misc/cxl.h                       |  156 -
 include/uapi/scsi/cxlflash_ioctl.h            |  276 --
 .../filesystems/statmount/statmount_test.c    |   13 +-
 68 files changed, 49 insertions(+), 25819 deletions(-)
 rename Documentation/ABI/{obsolete => removed}/sysfs-class-cxl (87%)
 delete mode 100644 Documentation/arch/powerpc/cxl.rst
 delete mode 100644 Documentation/arch/powerpc/cxlflash.rst
 delete mode 100644 arch/powerpc/platforms/powernv/pci-cxl.c
 delete mode 100644 drivers/misc/cxl/Kconfig
 delete mode 100644 drivers/misc/cxl/Makefile
 delete mode 100644 drivers/misc/cxl/api.c
 delete mode 100644 drivers/misc/cxl/base.c
 delete mode 100644 drivers/misc/cxl/context.c
 delete mode 100644 drivers/misc/cxl/cxl.h
 delete mode 100644 drivers/misc/cxl/cxllib.c
 delete mode 100644 drivers/misc/cxl/debugfs.c
 delete mode 100644 drivers/misc/cxl/fault.c
 delete mode 100644 drivers/misc/cxl/file.c
 delete mode 100644 drivers/misc/cxl/flash.c
 delete mode 100644 drivers/misc/cxl/guest.c
 delete mode 100644 drivers/misc/cxl/hcalls.c
 delete mode 100644 drivers/misc/cxl/hcalls.h
 delete mode 100644 drivers/misc/cxl/irq.c
 delete mode 100644 drivers/misc/cxl/main.c
 delete mode 100644 drivers/misc/cxl/native.c
 delete mode 100644 drivers/misc/cxl/of.c
 delete mode 100644 drivers/misc/cxl/pci.c
 delete mode 100644 drivers/misc/cxl/sysfs.c
 delete mode 100644 drivers/misc/cxl/trace.c
 delete mode 100644 drivers/misc/cxl/trace.h
 delete mode 100644 drivers/misc/cxl/vphb.c
 delete mode 100644 drivers/scsi/cxlflash/Kconfig
 delete mode 100644 drivers/scsi/cxlflash/Makefile
 delete mode 100644 drivers/scsi/cxlflash/backend.h
 delete mode 100644 drivers/scsi/cxlflash/common.h
 delete mode 100644 drivers/scsi/cxlflash/cxl_hw.c
 delete mode 100644 drivers/scsi/cxlflash/lunmgt.c
 delete mode 100644 drivers/scsi/cxlflash/main.c
 delete mode 100644 drivers/scsi/cxlflash/main.h
 delete mode 100644 drivers/scsi/cxlflash/ocxl_hw.c
 delete mode 100644 drivers/scsi/cxlflash/ocxl_hw.h
 delete mode 100644 drivers/scsi/cxlflash/sislite.h
 delete mode 100644 drivers/scsi/cxlflash/superpipe.c
 delete mode 100644 drivers/scsi/cxlflash/superpipe.h
 delete mode 100644 drivers/scsi/cxlflash/vlun.c
 delete mode 100644 drivers/scsi/cxlflash/vlun.h
 delete mode 100644 include/misc/cxl-base.h
 delete mode 100644 include/misc/cxl.h
 delete mode 100644 include/misc/cxllib.h
 delete mode 100644 include/uapi/misc/cxl.h
 delete mode 100644 include/uapi/scsi/cxlflash_ioctl.h

Comments

Michael Ellerman Dec. 17, 2024, 3:26 a.m. UTC | #1 
Andrew Donnellan <ajd@linux.ibm.com> writes:
> This series removes the cxl and cxlflash drivers for IBM CAPI devices.
>
> CAPI devices have been out of production for some time, and we're not
> aware of any remaining users who are likely to want a modern kernel.
> There's almost certainly some remaining driver bugs and we don't have much
> hardware available to properly test the drivers any more. Removing these
> drivers will also mean we can get rid of a non-trivial amount of support
> code in arch/powerpc.
>
> Thanks to everyone who's worked on these drivers over the last decade.

It would be good to explain that this only removes support for the
original CAPI interface - not the Power9 "OpenCAPI", which is still
supported by drivers/misc/ocxl.

cheers
Andrew Donnellan Dec. 17, 2024, 3:37 a.m. UTC | #2 
On Tue, 2024-12-17 at 14:26 +1100, Michael Ellerman wrote:
> It would be good to explain that this only removes support for the
> original CAPI interface - not the Power9 "OpenCAPI", which is still
> supported by drivers/misc/ocxl.

Agreed, will mention if/when I respin this