[kvm-unit-tests,v9,00/12] s390x: Testing the Channel Subsystem I/O

Message

Pierre Morel June 15, 2020, 9:31 a.m. UTC

Hi All,

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 0x3832, a.k.a. virtio-net-ccw.
        Checks SSCH(READ) and IO-IRQ

Note:
- The following patches are general usage and may be pulled first:
  s390x: Use PSW bits definitions in cstart
  s390x: Move control register bit definitions and add AFP to them
  s390x: saving regs for interrupts
  s390x: interrupt registration
  s390x: export the clock get_clock_ms() utility
  s390x: clock and delays caluculations
  s390x: define function to wait for interrupt
  s390x: retrieve decimal and hexadecimal kernel parameters

- These 4 patches are really I/O oriented:
  s390x: Library resources for CSS tests
  s390x: css: stsch, enumeration test
  s390x: css: msch, enable test
  s390x: css: ssch/tsch with sense and interrupt

Regards,
Pierre

Pierre Morel (12):
  s390x: Use PSW bits definitions in cstart
  s390x: Move control register bit definitions and add AFP to them
  s390x: saving regs for interrupts
  s390x: interrupt registration
  s390x: export the clock get_clock_ms() utility
  s390x: clock and delays caluculations
  s390x: define function to wait for interrupt
  s390x: retrieve decimal and hexadecimal kernel parameters
  s390x: Library resources for CSS tests
  s390x: css: stsch, enumeration test
  s390x: css: msch, enable test
  s390x: css: ssch/tsch with sense and interrupt

 lib/s390x/asm/arch_def.h |  32 ++++-
 lib/s390x/asm/time.h     |  51 ++++++++
 lib/s390x/css.h          | 276 +++++++++++++++++++++++++++++++++++++++
 lib/s390x/css_dump.c     | 153 ++++++++++++++++++++++
 lib/s390x/css_lib.c      | 176 +++++++++++++++++++++++++
 lib/s390x/interrupt.c    |  23 +++-
 lib/s390x/interrupt.h    |   8 ++
 lib/s390x/kernel-args.c  |  60 +++++++++
 lib/s390x/kernel-args.h  |  18 +++
 s390x/Makefile           |   4 +
 s390x/css.c              | 208 +++++++++++++++++++++++++++++
 s390x/cstart64.S         |  58 ++++++--
 s390x/intercept.c        |  11 +-
 s390x/unittests.cfg      |   4 +
 14 files changed, 1056 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 lib/s390x/kernel-args.c
 create mode 100644 lib/s390x/kernel-args.h
 create mode 100644 s390x/css.c