Re: [PATCH v2] hw/cxl: Fix missing write mask for HDM decoder target list registers

[Jonathan Cameron via <qemu-devel@nongnu.org>]

On Tue, 7 Jun 2022 11:56:17 +0100
Jonathan Cameron <Jonathan.Cameron@huawei.com> wrote:

> Without being able to write these registers, no interleaving is possible.
> More refined checks of HDM register state on commit to follow.
> 
> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

+Cc Ben on current address.

Which reminds me - Ben, when you have time please send an update
to MAINTAINERS to switch to your preferred email address going forwards.

Thanks,

Jonathan

> ---
> v2: (Ben Widawsky)
> - Correctly set a tighter write mask for the endpoint devices where this
>   register has a different use.
> 
>  hw/cxl/cxl-component-utils.c | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/hw/cxl/cxl-component-utils.c b/hw/cxl/cxl-component-utils.c
> index 7985c9bfca..40a0f752f2 100644
> --- a/hw/cxl/cxl-component-utils.c
> +++ b/hw/cxl/cxl-component-utils.c
> @@ -154,7 +154,8 @@ static void ras_init_common(uint32_t *reg_state, uint32_t *write_msk)
>      reg_state[R_CXL_RAS_ERR_CAP_CTRL] = 0x00;
>  }
>  
> -static void hdm_init_common(uint32_t *reg_state, uint32_t *write_msk)
> +static void hdm_init_common(uint32_t *reg_state, uint32_t *write_msk,
> +                            enum reg_type type)
>  {
>      int decoder_count = 1;
>      int i;
> @@ -174,6 +175,12 @@ static void hdm_init_common(uint32_t *reg_state, uint32_t *write_msk)
>          write_msk[R_CXL_HDM_DECODER0_SIZE_LO + i * 0x20] = 0xf0000000;
>          write_msk[R_CXL_HDM_DECODER0_SIZE_HI + i * 0x20] = 0xffffffff;
>          write_msk[R_CXL_HDM_DECODER0_CTRL + i * 0x20] = 0x13ff;
> +        if (type == CXL2_DEVICE) {
> +            write_msk[R_CXL_HDM_DECODER0_TARGET_LIST_LO + i * 0x20] = 0xf0000000;
> +        } else {
> +            write_msk[R_CXL_HDM_DECODER0_TARGET_LIST_LO + i * 0x20] = 0xffffffff;
> +        }
> +        write_msk[R_CXL_HDM_DECODER0_TARGET_LIST_HI + i * 0x20] = 0xffffffff;
>      }
>  }
>