Re: [PATCH 21/50] ppc/xive2: add interrupt priority configuration flags

["Nicholas Piggin" <npiggin@gmail.com>]

On Mon May 12, 2025 at 1:10 PM AEST, Nicholas Piggin wrote:
> From: Glenn Miles <milesg@linux.ibm.com>
>
> Adds support for extracting additional configuration flags from
> the XIVE configuration register that are needed for redistribution
> of group interrupts.

Reviewed-by: Nicholas Piggin <npiggin@gmail.com>

>
> Signed-off-by: Glenn Miles <milesg@linux.ibm.com>
> ---
>  hw/intc/pnv_xive2.c      | 16 ++++++++++++----
>  hw/intc/pnv_xive2_regs.h |  1 +
>  include/hw/ppc/xive2.h   |  8 +++++---
>  3 files changed, 18 insertions(+), 7 deletions(-)
>
> diff --git a/hw/intc/pnv_xive2.c b/hw/intc/pnv_xive2.c
> index c9374f0eee..96b8851b7e 100644
> --- a/hw/intc/pnv_xive2.c
> +++ b/hw/intc/pnv_xive2.c
> @@ -605,20 +605,28 @@ static uint32_t pnv_xive2_get_config(Xive2Router *xrtr)
>  {
>      PnvXive2 *xive = PNV_XIVE2(xrtr);
>      uint32_t cfg = 0;
> +    uint64_t reg = xive->cq_regs[CQ_XIVE_CFG >> 3];
>  
> -    if (xive->cq_regs[CQ_XIVE_CFG >> 3] & CQ_XIVE_CFG_GEN1_TIMA_OS) {
> +    if (reg & CQ_XIVE_CFG_GEN1_TIMA_OS) {
>          cfg |= XIVE2_GEN1_TIMA_OS;
>      }
>  
> -    if (xive->cq_regs[CQ_XIVE_CFG >> 3] & CQ_XIVE_CFG_EN_VP_SAVE_RESTORE) {
> +    if (reg & CQ_XIVE_CFG_EN_VP_SAVE_RESTORE) {
>          cfg |= XIVE2_VP_SAVE_RESTORE;
>      }
>  
> -    if (GETFIELD(CQ_XIVE_CFG_HYP_HARD_RANGE,
> -              xive->cq_regs[CQ_XIVE_CFG >> 3]) == CQ_XIVE_CFG_THREADID_8BITS) {
> +    if (GETFIELD(CQ_XIVE_CFG_HYP_HARD_RANGE, reg) ==
> +                      CQ_XIVE_CFG_THREADID_8BITS) {
>          cfg |= XIVE2_THREADID_8BITS;
>      }
>  
> +    if (reg & CQ_XIVE_CFG_EN_VP_GRP_PRIORITY) {
> +        cfg |= XIVE2_EN_VP_GRP_PRIORITY;
> +    }
> +
> +    cfg = SETFIELD(XIVE2_VP_INT_PRIO, cfg,
> +                   GETFIELD(CQ_XIVE_CFG_VP_INT_PRIO, reg));
> +
>      return cfg;
>  }
>  
> diff --git a/hw/intc/pnv_xive2_regs.h b/hw/intc/pnv_xive2_regs.h
> index e8b87b3d2c..d53300f709 100644
> --- a/hw/intc/pnv_xive2_regs.h
> +++ b/hw/intc/pnv_xive2_regs.h
> @@ -66,6 +66,7 @@
>  #define    CQ_XIVE_CFG_GEN1_TIMA_HYP_BLK0       PPC_BIT(26) /* 0 if bit[25]=0 */
>  #define    CQ_XIVE_CFG_GEN1_TIMA_CROWD_DIS      PPC_BIT(27) /* 0 if bit[25]=0 */
>  #define    CQ_XIVE_CFG_GEN1_END_ESX             PPC_BIT(28)
> +#define    CQ_XIVE_CFG_EN_VP_GRP_PRIORITY       PPC_BIT(32) /* 0 if bit[25]=1 */
>  #define    CQ_XIVE_CFG_EN_VP_SAVE_RESTORE       PPC_BIT(38) /* 0 if bit[25]=1 */
>  #define    CQ_XIVE_CFG_EN_VP_SAVE_REST_STRICT   PPC_BIT(39) /* 0 if bit[25]=1 */
>  
> diff --git a/include/hw/ppc/xive2.h b/include/hw/ppc/xive2.h
> index 2436ddb5e5..760b94a962 100644
> --- a/include/hw/ppc/xive2.h
> +++ b/include/hw/ppc/xive2.h
> @@ -29,9 +29,11 @@ OBJECT_DECLARE_TYPE(Xive2Router, Xive2RouterClass, XIVE2_ROUTER);
>   * Configuration flags
>   */
>  
> -#define XIVE2_GEN1_TIMA_OS      0x00000001
> -#define XIVE2_VP_SAVE_RESTORE   0x00000002
> -#define XIVE2_THREADID_8BITS    0x00000004
> +#define XIVE2_GEN1_TIMA_OS          0x00000001
> +#define XIVE2_VP_SAVE_RESTORE       0x00000002
> +#define XIVE2_THREADID_8BITS        0x00000004
> +#define XIVE2_EN_VP_GRP_PRIORITY    0x00000008
> +#define XIVE2_VP_INT_PRIO           0x00000030
>  
>  typedef struct Xive2RouterClass {
>      SysBusDeviceClass parent;