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xics: report errors with the QEMU Error API

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Using the return value to report errors is error prone:
- xics_alloc() returns -1 on error but spapr_vio_busdev_realize() errors
  on 0
- xics_alloc_block() returns the unclear value of ics->offset - 1 on error
  but both rtas_ibm_change_msi() and spapr_phb_realize() error on 0

This patch adds an errp argument to xics_alloc() and xics_alloc_block() to
report errors. The return value of these functions is a valid IRQ number
if errp is NULL. It is undefined otherwise.

The corresponding error traces get promotted to error messages. Note that
the "can't allocate IRQ" error message in spapr_vio_busdev_realize() also
moves to xics_alloc(). Similar error message consolidation isn't really
applicable to xics_alloc_block() because callers have extra context (device
config address, MSI or MSIX).

This fixes the issues mentioned above.

Based on previous work from Brian W. Hart.

Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Greg Kurz 2016-02-26 10:44:07 +01:00 • committed by David Gibson
parent 902c053d83
commit a005b3ef50
6 changed files with 28 additions and 18 deletions
Download patch file Download diff file Expand all files Collapse all files

5
include/hw/ppc/xics.h
View file

@ -161,8 +161,9 @@ struct ICSIRQState {
qemu_irq xics_get_qirq(XICSState *icp, int irq);
void xics_set_irq_type(XICSState *icp, int irq, bool lsi);
int xics_alloc(XICSState *icp, int src, int irq_hint, bool lsi);
int xics_alloc_block(XICSState *icp, int src, int num, bool lsi, bool align);
int xics_alloc(XICSState *icp, int src, int irq_hint, bool lsi, Error **errp);
int xics_alloc_block(XICSState *icp, int src, int num, bool lsi, bool align,
Error **errp);
void xics_free(XICSState *icp, int irq, int num);
void xics_cpu_setup(XICSState *icp, PowerPCCPU *cpu);