Re: [PATCH v4 13/25] ppc/xive: Introduce a xive_tctx_ipb_update() helper

[David Gibson <david@gibson.dropbear.id.au>]

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On Wed, Sep 18, 2019 at 06:06:33PM +0200, Cédric Le Goater wrote:
> We will use it to resend missed interrupts when a vCPU context is
> pushed a HW thread.
> 
> Signed-off-by: Cédric Le Goater <clg@kaod.org>
> ---
>  include/hw/ppc/xive.h |  1 +
>  hw/intc/xive.c        | 15 +++++++++++----
>  2 files changed, 12 insertions(+), 4 deletions(-)
> 
> diff --git a/include/hw/ppc/xive.h b/include/hw/ppc/xive.h
> index f35ff3b64791..a461753f5da5 100644
> --- a/include/hw/ppc/xive.h
> +++ b/include/hw/ppc/xive.h
> @@ -467,6 +467,7 @@ uint64_t xive_tctx_tm_read(XivePresenter *xptr, XiveTCTX *tctx, hwaddr offset,
>  
>  void xive_tctx_pic_print_info(XiveTCTX *tctx, Monitor *mon);
>  Object *xive_tctx_create(Object *cpu, XiveRouter *xrtr, Error **errp);
> +void xive_tctx_ipb_update(XiveTCTX *tctx, uint8_t ring, uint8_t ipb);
>  
>  static inline uint32_t xive_nvt_cam_line(uint8_t nvt_blk, uint32_t nvt_idx)
>  {
> diff --git a/hw/intc/xive.c b/hw/intc/xive.c
> index 68d3361d1c3f..5f7c37b091a7 100644
> --- a/hw/intc/xive.c
> +++ b/hw/intc/xive.c
> @@ -135,6 +135,15 @@ static void xive_tctx_set_cppr(XiveTCTX *tctx, uint8_t ring, uint8_t cppr)
>      xive_tctx_notify(tctx, ring);
>  }
>  
> +void xive_tctx_ipb_update(XiveTCTX *tctx, uint8_t ring, uint8_t ipb)
> +{
> +    uint8_t *regs = &tctx->regs[ring];
> +
> +    regs[TM_IPB] |= ipb;
> +    regs[TM_PIPR] = ipb_to_pipr(regs[TM_IPB]);

You're opencoding the existing ipb_update() here, but not eliminating
it.  That doesn't seem like a good idea.

> +    xive_tctx_notify(tctx, ring);
> +}
> +
>  static inline uint32_t xive_tctx_word2(uint8_t *ring)
>  {
>      return *((uint32_t *) &ring[TM_WORD2]);
> @@ -336,8 +345,7 @@ static void xive_tm_set_os_cppr(XivePresenter *xptr, XiveTCTX *tctx,
>  static void xive_tm_set_os_pending(XivePresenter *xptr, XiveTCTX *tctx,
>                                     hwaddr offset, uint64_t value, unsigned size)
>  {
> -    ipb_update(&tctx->regs[TM_QW1_OS], value & 0xff);
> -    xive_tctx_notify(tctx, TM_QW1_OS);
> +    xive_tctx_ipb_update(tctx, TM_QW1_OS, priority_to_ipb(value & 0xff));
>  }
>  
>  static uint64_t xive_tm_pull_os_ctx(XivePresenter *xptr, XiveTCTX *tctx,
> @@ -1382,8 +1390,7 @@ static bool xive_presenter_notify(uint8_t format,
>  
>      /* handle CPU exception delivery */
>      if (count) {
> -        ipb_update(&match.tctx->regs[match.ring], priority);
> -        xive_tctx_notify(match.tctx, match.ring);
> +        xive_tctx_ipb_update(match.tctx, match.ring, priority_to_ipb(priority));
>      }
>  
>      return count;

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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