Re: [PATCH 1/2] pnv/xive2: Add a get_config() method on the presenter class

["Cédric Le Goater" <clg@kaod.org>]

On 6/21/23 18:03, Frederic Barrat wrote:
> The presenters for xive on P9 and P10 are mostly similar but the
> behavior can be tuned through a few CQ registers. This patch adds a
> "get_config" method, which will allow to access that config from the
> presenter in a later patch.
> For now, just define the config for the TIMA version.
> 
> Signed-off-by: Frederic Barrat <fbarrat@linux.ibm.com>

Looks good. If I remember well, each XIVE subunit has a copy of the
config registers and modifications to the CQ unit are spanned to the
others.

Reviewed-by: Cédric Le Goater <clg@kaod.org>

Thanks,

C.

> ---
>   hw/intc/pnv_xive.c    | 11 +++++++++++
>   hw/intc/pnv_xive2.c   | 12 ++++++++++++
>   hw/intc/xive.c        |  7 +++++++
>   include/hw/ppc/xive.h |  3 +++
>   4 files changed, 33 insertions(+)
> 
> diff --git a/hw/intc/pnv_xive.c b/hw/intc/pnv_xive.c
> index 622f9d28b7..e536b3ec26 100644
> --- a/hw/intc/pnv_xive.c
> +++ b/hw/intc/pnv_xive.c
> @@ -479,6 +479,16 @@ static int pnv_xive_match_nvt(XivePresenter *xptr, uint8_t format,
>       return count;
>   }
>   
> +static uint32_t pnv_xive_presenter_get_config(XivePresenter *xptr)
> +{
> +    uint32_t cfg = 0;
> +
> +    /* TIMA GEN1 is all P9 knows */
> +    cfg |= XIVE_PRESENTER_GEN1_TIMA_OS;
> +
> +    return cfg;
> +}
> +
>   static uint8_t pnv_xive_get_block_id(XiveRouter *xrtr)
>   {
>       return pnv_xive_block_id(PNV_XIVE(xrtr));
> @@ -1991,6 +2001,7 @@ static void pnv_xive_class_init(ObjectClass *klass, void *data)
>   
>       xnc->notify = pnv_xive_notify;
>       xpc->match_nvt  = pnv_xive_match_nvt;
> +    xpc->get_config = pnv_xive_presenter_get_config;
>   };
>   
>   static const TypeInfo pnv_xive_info = {
> diff --git a/hw/intc/pnv_xive2.c b/hw/intc/pnv_xive2.c
> index ec1edeb385..59534f6843 100644
> --- a/hw/intc/pnv_xive2.c
> +++ b/hw/intc/pnv_xive2.c
> @@ -501,6 +501,17 @@ static int pnv_xive2_match_nvt(XivePresenter *xptr, uint8_t format,
>       return count;
>   }
>   
> +static uint32_t pnv_xive2_presenter_get_config(XivePresenter *xptr)
> +{
> +    PnvXive2 *xive = PNV_XIVE2(xptr);
> +    uint32_t cfg = 0;
> +
> +    if (xive->cq_regs[CQ_XIVE_CFG >> 3] & CQ_XIVE_CFG_GEN1_TIMA_OS) {
> +        cfg |= XIVE_PRESENTER_GEN1_TIMA_OS;
> +    }
> +    return cfg;
> +}
> +
>   static uint8_t pnv_xive2_get_block_id(Xive2Router *xrtr)
>   {
>       return pnv_xive2_block_id(PNV_XIVE2(xrtr));
> @@ -1987,6 +1998,7 @@ static void pnv_xive2_class_init(ObjectClass *klass, void *data)
>       xnc->notify    = pnv_xive2_notify;
>   
>       xpc->match_nvt  = pnv_xive2_match_nvt;
> +    xpc->get_config = pnv_xive2_presenter_get_config;
>   };
>   
>   static const TypeInfo pnv_xive2_info = {
> diff --git a/hw/intc/xive.c b/hw/intc/xive.c
> index 5204c14b87..34a868b185 100644
> --- a/hw/intc/xive.c
> +++ b/hw/intc/xive.c
> @@ -461,6 +461,13 @@ static void xive_tm_push_os_ctx(XivePresenter *xptr, XiveTCTX *tctx,
>       }
>   }
>   
> +static __attribute__((unused)) uint32_t xive_presenter_get_config(XivePresenter *xptr)
> +{
> +    XivePresenterClass *xpc = XIVE_PRESENTER_GET_CLASS(xptr);
> +
> +    return xpc->get_config(xptr);
> +}
> +
>   /*
>    * Define a mapping of "special" operations depending on the TIMA page
>    * offset and the size of the operation.
> diff --git a/include/hw/ppc/xive.h b/include/hw/ppc/xive.h
> index f7eea4ca81..3dfb06e002 100644
> --- a/include/hw/ppc/xive.h
> +++ b/include/hw/ppc/xive.h
> @@ -430,6 +430,8 @@ typedef struct XivePresenterClass XivePresenterClass;
>   DECLARE_CLASS_CHECKERS(XivePresenterClass, XIVE_PRESENTER,
>                          TYPE_XIVE_PRESENTER)
>   
> +#define XIVE_PRESENTER_GEN1_TIMA_OS     0x1
> +
>   struct XivePresenterClass {
>       InterfaceClass parent;
>       int (*match_nvt)(XivePresenter *xptr, uint8_t format,
> @@ -437,6 +439,7 @@ struct XivePresenterClass {
>                        bool cam_ignore, uint8_t priority,
>                        uint32_t logic_serv, XiveTCTXMatch *match);
>       bool (*in_kernel)(const XivePresenter *xptr);
> +    uint32_t (*get_config)(XivePresenter *xptr);
>   };
>   
>   int xive_presenter_tctx_match(XivePresenter *xptr, XiveTCTX *tctx,