[kvm-unit-tests,v7,00/12] s390x: Testing the Channel Subsystem I/O

Message

Pierre Morel May 18, 2020, 4:07 p.m. UTC

Goal of the series is to have a framework to test Channel-Subsystem I/O with
QEMU/KVM.
  
To be able to support interrupt for CSS I/O and for SCLP we need to modify
the interrupt framework to allow re-entrant interruptions.
  
We add a registration for IRQ callbacks to the test program to define its own
interrupt handler. We need to do special work under interrupt like acknowledging
the interrupt.
  
Being working on PSW bits to allow I/O interrupt, we define new PSW bits
in arch_def.h and use __ASSEMBLER__ define to be able to include this header
in an assembler source file.

This series presents four major tests:
- Enumeration:
        The CSS is enumerated using the STSCH instruction recursively on all
        potentially existing channels.
        Keeping the first channel found as a reference for future use.
        Checks STSCH
 
- Enable:
        If the enumeration succeeded the tests enables the reference
        channel with MSCH and verifies with STSCH that the channel is
        effectively enabled, retrying a predefined count on failure
	to enable the channel
        Checks MSCH       
 
- Sense:
        If the channel is enabled this test sends a SENSE_ID command
        to the reference channel, analyzing the answer and expecting
        the Control unit type being 0xc0ca
        Checks SSCH(READ) and IO-IRQ

- ping-pong:
        If the reference channel leads to the PONG device (0xc0ca),
        the test exchanges a string containing a 9 digit number with
        the PONG device and expecting this number to be incremented
        by the PONG device.
        Checks SSCH(WRITE)


Note:
- The following patches may be pulled first:
  s390x: saving regs for interrupts
  s390x: Use PSW bits definitions in cstart
  s390x: Move control register bit definitions and add AFP to them
  s390x: export the clock get_clock_ms() utility
  s390x: use get_clock_ms() to calculate a delay in ms

- I think this one if it receives reviewed-by can also be pulled now:
  s390x: define function to wait for interrupt

- this patch has a comment from Janosch who asks change so... need opinion:
  but since I need reviews for the next patches I let it here unchanged.
  s390x: interrupt registration

- These 5 patches are really I/O oriented and need reviewed-by:
  s390x: Library resources for CSS tests
  s390x: css: stsch, enumeration test
  s390x: css: msch, enable test
  s390x: css: ssch/tsch with sense and interrupt
  s390x: css: ping pong

Regards,
Pierre

Pierre Morel (12):
  s390x: saving regs for interrupts
  s390x: Use PSW bits definitions in cstart
  s390x: Move control register bit definitions and add AFP to them
  s390x: interrupt registration
  s390x: export the clock get_clock_ms() utility
  s390x: use get_clock_ms() to calculate a delay in ms
  s390x: Library resources for CSS tests
  s390x: css: stsch, enumeration test
  s390x: css: msch, enable test
  s390x: define function to wait for interrupt
  s390x: css: ssch/tsch with sense and interrupt
  s390x: css: ping pong

 lib/s390x/asm/arch_def.h |  32 +++-
 lib/s390x/asm/time.h     |  36 ++++
 lib/s390x/css.h          | 279 ++++++++++++++++++++++++++++++
 lib/s390x/css_dump.c     | 157 +++++++++++++++++
 lib/s390x/css_lib.c      |  55 ++++++
 lib/s390x/interrupt.c    |  23 ++-
 lib/s390x/interrupt.h    |   8 +
 s390x/Makefile           |   3 +
 s390x/css.c              | 355 +++++++++++++++++++++++++++++++++++++++
 s390x/cstart64.S         |  58 +++++--
 s390x/intercept.c        |  11 +-
 s390x/unittests.cfg      |   4 +
 12 files changed, 995 insertions(+), 26 deletions(-)
 create mode 100644 lib/s390x/asm/time.h
 create mode 100644 lib/s390x/css.h
 create mode 100644 lib/s390x/css_dump.c
 create mode 100644 lib/s390x/css_lib.c
 create mode 100644 lib/s390x/interrupt.h
 create mode 100644 s390x/css.c