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s390/qdio: Cleanup error handling to drivers

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Various improvements of qdio error reporting to the
upper-layer drivers (qeth, zfcp):

- Split QDIO_ERROR_ACTIVATE_CHECK_CONDITION into:

  QDIO_ERROR_ACTIVATE: qdio termination interrupt
  QDIO_ERROR_GET_BUF_STATE: QIOASSIST eqbs error
  QDIO_ERROR_SET_BUF_STATE: QIOASSIST sqbs error

  Add QDIO_ERROR_FATAL / QDIO_ERROR_TEMPORARY masks
  to ease recovery decision in upper-layer drivers.

- Don't (ab-)use qdio handler errors as return codes
  for do_QDIO but use standard error codes:

  -ENOBUFS: temporary target CC=2 condition
  -EBUSY: unresolved SIGA-W CC=2 busy condition
  -EIO: I/O error (CC=1, CC=3)

- Remove unneeded memory clobber from SIGA-R
- Remove EX_TABLE entry on SIGA-W, we want to see these errors

Reviewed-by: Ursula Braun <ursula.braun@de.ibm.com>
Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Jan Glauber
2012-05-09 16:27:34 +02:00
committed by Martin Schwidefsky
parent 050276ab8c
commit 1549d13f4c
3 changed files with 31 additions and 28 deletions
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12
arch/s390/include/asm/qdio.h
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@@ -325,11 +325,13 @@ typedef void qdio_handler_t(struct ccw_device *, unsigned int, int,
int, int, unsigned long);
/* qdio errors reported to the upper-layer program */
#define QDIO_ERROR_SIGA_TARGET 0x02
#define QDIO_ERROR_SIGA_ACCESS_EXCEPTION 0x10
#define QDIO_ERROR_SIGA_BUSY 0x20
#define QDIO_ERROR_ACTIVATE_CHECK_CONDITION 0x40
#define QDIO_ERROR_SLSB_STATE 0x80
#define QDIO_ERROR_ACTIVATE 0x0001
#define QDIO_ERROR_GET_BUF_STATE 0x0002
#define QDIO_ERROR_SET_BUF_STATE 0x0004
#define QDIO_ERROR_SLSB_STATE 0x0100
#define QDIO_ERROR_FATAL 0x00ff
#define QDIO_ERROR_TEMPORARY 0xff00
/* for qdio_cleanup */
#define QDIO_FLAG_CLEANUP_USING_CLEAR 0x01