[kvm-unit-tests,v3,0/9] s390x: Testing the Channel Subsystem I/O

Message

Pierre Morel Dec. 6, 2019, 4:26 p.m. UTC

Goal of the series is to have a framwork 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 programm to define its own
interrupt handler. We need to do special work under interrupt like acknoledging
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
	Checks MSCH

- Sense:
	If the channel is enabled this test sends a SENSE_ID command
	to the reference channel, analysing 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)


Pierre Morel (9):
  s390x: saving regs for interrupts
  s390x: Define the PSW bits
  s390: interrupt registration
  s390x: export the clock get_clock_ms() utility
  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

 lib/s390x/asm/arch_def.h | 127 ++++++++-------
 lib/s390x/asm/time.h     |  27 ++++
 lib/s390x/css.h          | 273 +++++++++++++++++++++++++++++++
 lib/s390x/css_dump.c     | 156 ++++++++++++++++++
 lib/s390x/interrupt.c    |  23 ++-
 lib/s390x/interrupt.h    |   7 +
 s390x/Makefile           |   2 +
 s390x/css.c              | 335 +++++++++++++++++++++++++++++++++++++++
 s390x/cstart64.S         |  38 ++++-
 s390x/intercept.c        |  11 +-
 s390x/unittests.cfg      |   4 +
 11 files changed, 924 insertions(+), 79 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/interrupt.h
 create mode 100644 s390x/css.c