Re: [PATCH 1/9] ppc/pnv: Improve trigger data definition

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

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On Mon, Oct 07, 2019 at 10:40:54AM +0200, Cédric Le Goater wrote:
> The trigger data is used for both triggers of a HW source interrupts,
> PHB, PSI, and triggers for rerouting interrupts between interrupt
> controllers.
> 
> When an interrupt is rerouted, the trigger data follows an "END
> trigger" format. In that case, the remote IC needs EAS containing an
> END index to perform a lookup of an END.
> 
> An END trigger, bit0 of word0 set to '1', is defined as :
> 
>              |0123|4567|0123|4567|0123|4567|0123|4567|
>     W0 E=1   |1P--|BLOC|          END IDX            |
>     W1 E=1   |M   |           END DATA               |
> 
> An EAS is defined as :
> 
>              |0123|4567|0123|4567|0123|4567|0123|4567|
>     W0       |V---|BLOC|          END IDX            |
>     W1       |M   |          END DATA                |
> 
> The END trigger adds an extra 'PQ' bit, bit1 of word0 set to '1',
> signaling that the PQ bits have been checked. That bit is unused in
> the initial EAS definition.
> 
> When a HW device performs the trigger, the trigger data follows an
> "EAS trigger" format because the trigger data in that case contains an
> EAS index which the IC needs to look for.
> 
> An EAS trigger, bit0 of word0 set to '0', is defined as :
> 
>              |0123|4567|0123|4567|0123|4567|0123|4567|
>     W0 E=0   |0P--|---- ---- ---- ---- ---- ---- ----|
>     W1 E=0   |BLOC|            EAS INDEX             |
> 
> There is also a 'PQ' bit, bit1 of word0 to '1', signaling that the
> PQ bits have been checked.
> 
> Introduce these new trigger bits and rename the XIVE_SRCNO macros in
> XIVE_EAS to reflect better the nature of the data.
> 
> Signed-off-by: Cédric Le Goater <clg@kaod.org>

Applied to ppc-for-4.2, thanks.

> ---
>  include/hw/ppc/xive_regs.h | 26 +++++++++++++++++++++++---
>  hw/intc/pnv_xive.c         | 20 ++++++++++++++++----
>  hw/intc/xive.c             |  4 ++--
>  3 files changed, 41 insertions(+), 9 deletions(-)
> 
> diff --git a/include/hw/ppc/xive_regs.h b/include/hw/ppc/xive_regs.h
> index 08c8bf7172e2..55307cd1533c 100644
> --- a/include/hw/ppc/xive_regs.h
> +++ b/include/hw/ppc/xive_regs.h
> @@ -22,9 +22,29 @@
>  /*
>   * Interrupt source number encoding on PowerBUS
>   */
> -#define XIVE_SRCNO_BLOCK(srcno) (((srcno) >> 28) & 0xf)
> -#define XIVE_SRCNO_INDEX(srcno) ((srcno) & 0x0fffffff)
> -#define XIVE_SRCNO(blk, idx)    ((uint32_t)(blk) << 28 | (idx))
> +/*
> + * Trigger data definition
> + *
> + * The trigger definition is used for triggers both for HW source
> + * interrupts (PHB, PSI), as well as for rerouting interrupts between
> + * Interrupt Controller.
> + *
> + * HW source controllers set bit0 of word0 to ‘0’ as they provide EAS
> + * information (EAS block + EAS index) in the 8 byte data and not END
> + * information, which is use for rerouting interrupts.
> + *
> + * bit1 of word0 to ‘1’ signals that the state bit check has been
> + * performed.
> + */
> +#define XIVE_TRIGGER_END        PPC_BIT(0)
> +#define XIVE_TRIGGER_PQ         PPC_BIT(1)
> +
> +/*
> + * QEMU macros to manipulate the trigger payload in native endian
> + */
> +#define XIVE_EAS_BLOCK(n)       (((n) >> 28) & 0xf)
> +#define XIVE_EAS_INDEX(n)       ((n) & 0x0fffffff)
> +#define XIVE_EAS(blk, idx)      ((uint32_t)(blk) << 28 | (idx))
>  
>  #define TM_SHIFT                16
>  
> diff --git a/hw/intc/pnv_xive.c b/hw/intc/pnv_xive.c
> index ed6e9d71bbfa..348f2fdd263d 100644
> --- a/hw/intc/pnv_xive.c
> +++ b/hw/intc/pnv_xive.c
> @@ -385,7 +385,7 @@ static int pnv_xive_get_eas(XiveRouter *xrtr, uint8_t blk, uint32_t idx,
>      PnvXive *xive = PNV_XIVE(xrtr);
>  
>      if (pnv_xive_get_ic(blk) != xive) {
> -        xive_error(xive, "VST: EAS %x is remote !?", XIVE_SRCNO(blk, idx));
> +        xive_error(xive, "VST: EAS %x is remote !?", XIVE_EAS(blk, idx));
>          return -1;
>      }
>  
> @@ -431,7 +431,7 @@ static void pnv_xive_notify(XiveNotifier *xn, uint32_t srcno)
>      PnvXive *xive = PNV_XIVE(xn);
>      uint8_t blk = xive->chip->chip_id;
>  
> -    xive_router_notify(xn, XIVE_SRCNO(blk, srcno));
> +    xive_router_notify(xn, XIVE_EAS(blk, srcno));
>  }
>  
>  /*
> @@ -1225,12 +1225,24 @@ static const MemoryRegionOps pnv_xive_ic_reg_ops = {
>  
>  static void pnv_xive_ic_hw_trigger(PnvXive *xive, hwaddr addr, uint64_t val)
>  {
> +    uint8_t blk;
> +    uint32_t idx;
> +
> +    if (val & XIVE_TRIGGER_END) {
> +        xive_error(xive, "IC: END trigger at @0x%"HWADDR_PRIx" data 0x%"PRIx64,
> +                   addr, val);
> +        return;
> +    }
> +
>      /*
>       * Forward the source event notification directly to the Router.
>       * The source interrupt number should already be correctly encoded
>       * with the chip block id by the sending device (PHB, PSI).
>       */
> -    xive_router_notify(XIVE_NOTIFIER(xive), val);
> +    blk = XIVE_EAS_BLOCK(val);
> +    idx = XIVE_EAS_INDEX(val);
> +
> +    xive_router_notify(XIVE_NOTIFIER(xive), XIVE_EAS(blk, idx));
>  }
>  
>  static void pnv_xive_ic_notify_write(void *opaque, hwaddr addr, uint64_t val,
> @@ -1566,7 +1578,7 @@ void pnv_xive_pic_print_info(PnvXive *xive, Monitor *mon)
>  {
>      XiveRouter *xrtr = XIVE_ROUTER(xive);
>      uint8_t blk = xive->chip->chip_id;
> -    uint32_t srcno0 = XIVE_SRCNO(blk, 0);
> +    uint32_t srcno0 = XIVE_EAS(blk, 0);
>      uint32_t nr_ipis = pnv_xive_nr_ipis(xive);
>      uint32_t nr_ends = pnv_xive_nr_ends(xive);
>      XiveEAS eas;
> diff --git a/hw/intc/xive.c b/hw/intc/xive.c
> index 29df06df1136..cbe4ae6c294d 100644
> --- a/hw/intc/xive.c
> +++ b/hw/intc/xive.c
> @@ -1648,8 +1648,8 @@ do_escalation:
>  void xive_router_notify(XiveNotifier *xn, uint32_t lisn)
>  {
>      XiveRouter *xrtr = XIVE_ROUTER(xn);
> -    uint8_t eas_blk = XIVE_SRCNO_BLOCK(lisn);
> -    uint32_t eas_idx = XIVE_SRCNO_INDEX(lisn);
> +    uint8_t eas_blk = XIVE_EAS_BLOCK(lisn);
> +    uint32_t eas_idx = XIVE_EAS_INDEX(lisn);
>      XiveEAS eas;
>  
>      /* EAS cache lookup */

-- 
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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