[RFC,0/2] Region creation/configuration ABI

Message

Ben Widawsky Feb. 25, 2022, 6 a.m. UTC

I'm looking for feedback on the next generation of the region configuration and
creation ABI. The primary changes from the v3 posting of the region driver [1]
are:
- Decoders instead of memdevs for targets
- Substantial rework around creation
- configuration sanitization at ABI boundary
- teardown region on memdev/decoder removal

With the new changes, it makes the most sense to rework the series so that
existing region enumeration (setup by boot firmware) be done prior to allowing
region creation. This is because the changes requested will require claiming
resources at configuration time rather than region->probe() time.

That said, these patches do reflect the proposed ABI and they can be reviewed in
parallel with that work. I'd appreciate feedback around whether the proposed ABI
is missing anything, and, whether there are inherent flaws in the
implementation.

[1]: https://lore.kernel.org/linux-cxl/[e-mail]/

Ben Widawsky (2):
  cxl/region: Add region creation ABI
  cxl/region: Introduce concept of region configuration

 Documentation/ABI/testing/sysfs-bus-cxl       |  82 +++
 .../driver-api/cxl/memory-devices.rst         |  11 +
 drivers/cxl/core/Makefile                     |   1 +
 drivers/cxl/core/core.h                       |   3 +
 drivers/cxl/core/port.c                       |  26 +
 drivers/cxl/core/region.c                     | 568 ++++++++++++++++++
 drivers/cxl/cxl.h                             |  21 +-
 drivers/cxl/region.h                          |  93 +++
 tools/testing/cxl/Kbuild                      |   1 +
 9 files changed, 805 insertions(+), 1 deletion(-)
 create mode 100644 drivers/cxl/core/region.c
 create mode 100644 drivers/cxl/region.h


base-commit: 3bdf187d313e067de2a81109f9a1dd3da7f3dc2c