Re: [Qemu-devel] [PATCH] xics: added end-of-interrupt (EOI) handlers

[Alexey Kardashevskiy <aik@ozlabs.ru>]

Already outdated :)

On 10/07/12 23:46, Alexey Kardashevskiy wrote:
> Normally when the host driver gets called via interrupt, it disables IRQ
> first, then handles it and enables back. In the case of PCI pass through,
> the actual handling is done by the guest so the host driver needs to know
> when to enable IRQ back.
> 
> The patch introduces add/remove callback API and EOI initialization for
> the XICS interrupt controller.
> 
> Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
> ---
>  hw/xics.c |   18 ++++++++++++++++++
>  hw/xics.h |    5 +++++
>  2 files changed, 23 insertions(+)
> 
> diff --git a/hw/xics.c b/hw/xics.c
> index 668a0d6..de7833e 100644
> --- a/hw/xics.c
> +++ b/hw/xics.c
> @@ -170,6 +170,7 @@ struct ics_irq_state {
>      int sent:1;
>      int rejected:1;
>      int masked_pending:1;
> +    NotifierList eoi_notifier;
>  };
>  
>  struct ics_state {
> @@ -309,6 +310,8 @@ static void ics_eoi(struct ics_state *ics, int nr)
>      if (irq->type == XICS_LSI) {
>          irq->sent = 0;
>      }
> +
> +    notifier_list_notify(&irq->eoi_notifier, NULL);
>  }
>  
>  /*
> @@ -536,6 +539,7 @@ struct icp_state *xics_system_init(int nr_irqs)
>      for (i = 0; i < nr_irqs; i++) {
>          ics->irqs[i].priority = 0xff;
>          ics->irqs[i].saved_priority = 0xff;
> +        notifier_list_init(&ics->irqs[i].eoi_notifier);
>      }
>  
>      ics->qirqs = qemu_allocate_irqs(ics_set_irq, ics, nr_irqs);
> @@ -552,3 +556,17 @@ struct icp_state *xics_system_init(int nr_irqs)
>  
>      return icp;
>  }
> +
> +void xics_add_eoi_notifier(Notifier *notify, uint32_t srcno)
> +{
> +    struct ics_state *ics = spapr->icp->ics;
> +    struct ics_irq_state *irq = &ics->irqs[srcno - ics->offset];
> +
> +    notifier_list_add(&irq->eoi_notifier, notify);
> +}
> +
> +void xics_remove_eoi_notifier(Notifier *notify)
> +{
> +    notifier_remove(notify);
> +}
> +
> diff --git a/hw/xics.h b/hw/xics.h
> index 2080159..762243c 100644
> --- a/hw/xics.h
> +++ b/hw/xics.h
> @@ -27,6 +27,8 @@
>  #if !defined(__XICS_H__)
>  #define __XICS_H__
>  
> +#include "notify.h"
> +
>  #define XICS_IPI        0x2
>  
>  struct icp_state;
> @@ -41,4 +43,7 @@ qemu_irq xics_assign_irq(struct icp_state *icp, int irq,
>  
>  struct icp_state *xics_system_init(int nr_irqs);
>  
> +void xics_add_eoi_notifier(Notifier *notify, uint32_t srcno);
> +void xics_remove_eoi_notifier(Notifier *notify);
> +
>  #endif /* __XICS_H__ */
> 


-- 
Alexey