Re: [RFC PATCH v3 07/31] hw/cxl/device: Add cheap EVENTS implementation (8.2.9.1)

[Jonathan Cameron]

On Mon, 1 Feb 2021 16:59:24 -0800
Ben Widawsky <ben.widawsky@intel.com> wrote:

> Using the previously implemented stubbed helpers, it is now possible to
> easily add the missing, required commands to the implementation.
> 
> Signed-off-by: Ben Widawsky <ben.widawsky@intel.com>
> ---
>  hw/cxl/cxl-mailbox-utils.c | 23 ++++++++++++++++++++++-
>  1 file changed, 22 insertions(+), 1 deletion(-)
> 
> diff --git a/hw/cxl/cxl-mailbox-utils.c b/hw/cxl/cxl-mailbox-utils.c
> index 466055b01a..7c939a1851 100644
> --- a/hw/cxl/cxl-mailbox-utils.c
> +++ b/hw/cxl/cxl-mailbox-utils.c
> @@ -37,6 +37,14 @@
>   *  a register interface that already deals with it.
>   */
>  
> +enum {
> +    EVENTS      = 0x01,
> +        #define GET_RECORDS   0x0
> +        #define CLEAR_RECORDS   0x1
> +        #define GET_INTERRUPT_POLICY   0x2
> +        #define SET_INTERRUPT_POLICY   0x3
> +};
> +
>  /* 8.2.8.4.5.1 Command Return Codes */
>  typedef enum {
>      CXL_MBOX_SUCCESS = 0x0,
> @@ -105,10 +113,23 @@ struct cxl_cmd {
>          return CXL_MBOX_SUCCESS;                                          \
>      }
>  
> +define_mailbox_handler_zeroed(EVENTS_GET_RECORDS, 0x20);
> +define_mailbox_handler_nop(EVENTS_CLEAR_RECORDS);
> +define_mailbox_handler_zeroed(EVENTS_GET_INTERRUPT_POLICY, 4);
> +define_mailbox_handler_nop(EVENTS_SET_INTERRUPT_POLICY);
> +
> +#define IMMEDIATE_CONFIG_CHANGE (1 << 1)
> +#define IMMEDIATE_LOG_CHANGE (1 << 4)
> +
>  #define CXL_CMD(s, c, in, cel_effect) \
>      [s][c] = { stringify(s##_##c), cmd_##s##_##c, in, cel_effect }
>  
> -static struct cxl_cmd cxl_cmd_set[256][256] = {};
> +static struct cxl_cmd cxl_cmd_set[256][256] = {
> +    CXL_CMD(EVENTS, GET_RECORDS, 1, 0),
> +    CXL_CMD(EVENTS, CLEAR_RECORDS, ~0, IMMEDIATE_LOG_CHANGE),
> +    CXL_CMD(EVENTS, GET_INTERRUPT_POLICY, 0, 0),
> +    CXL_CMD(EVENTS, SET_INTERRUPT_POLICY, 4, IMMEDIATE_CONFIG_CHANGE),

CXL 2.0 spec says IMMEDIATE_POLICY_CHANGE for this rather than
IMMEDIATE_CONFIG_CHANGE.

> +};
>  
>  #undef CXL_CMD
>