On Mon, 30 Oct 2017 14:48:23 +0100
Christian Borntraeger <borntrae...@de.ibm.com> wrote:
> FWIW, I am testing a guest patch that enables zPCI without AIS. Its as simple
> as
>
>
> diff --git a/arch/s390/pci/pci.c b/arch/s390/pci/pci.c
> index 7b30af5..9b24836 100644
> --- a/arch/s390/pci/pci.c
> +++ b/arch/s390/pci/pci.c
> @@ -953,7 +953,7 @@ static int __init pci_base_init(void)
> if (!s390_pci_probe)
> return 0;
>
> - if (!test_facility(69) || !test_facility(71) || !test_facility(72))
> + if (!test_facility(69) || !test_facility(71))
> return 0;
>
> rc = zpci_debug_init();
> diff --git a/arch/s390/pci/pci_insn.c b/arch/s390/pci/pci_insn.c
> index ea34086..61f8c82 100644
> --- a/arch/s390/pci/pci_insn.c
> +++ b/arch/s390/pci/pci_insn.c
> @@ -7,6 +7,7 @@
> #include <linux/export.h>
> #include <linux/errno.h>
> #include <linux/delay.h>
> +#include <asm/facility.h>
> #include <asm/pci_insn.h>
> #include <asm/pci_debug.h>
> #include <asm/processor.h>
> @@ -93,6 +94,8 @@ int zpci_refresh_trans(u64 fn, u64 addr, u64 range)
> /* Set Interruption Controls */
> void zpci_set_irq_ctrl(u16 ctl, char *unused, u8 isc)
> {
> + if (!test_facility(72))
> + return;
> asm volatile (
> " .insn rsy,0xeb00000000d1,%[ctl],%[isc],%[u]\n"
> : : [ctl] "d" (ctl), [isc] "d" (isc << 27), [u] "Q"
> (*unused));
>
Sounds good. Presumably this makes the adapter interrupt handling work
as for virtio (and qdio)? Is there any ais-less pci hardware out in the
wild?
