Re: [PATCH 5/6] hw/cxl: Add poison injection via the mailbox.

[Ira Weiny <ira.weiny@intel.com>]

Jonathan Cameron wrote:
> Very simple implementation to allow testing of corresponding
> kernel code. Note that for now we track each 64 byte section
> independently.  Whilst a valid implementation choice, it may
> make sense to fuse entries so as to prove out more complex
> corners of the kernel code.
> 
> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
> ---
>  hw/cxl/cxl-mailbox-utils.c | 40 ++++++++++++++++++++++++++++++++++++++
>  1 file changed, 40 insertions(+)
> 
> diff --git a/hw/cxl/cxl-mailbox-utils.c b/hw/cxl/cxl-mailbox-utils.c
> index cf3cfb10a1..7d3f7bcd3a 100644
> --- a/hw/cxl/cxl-mailbox-utils.c
> +++ b/hw/cxl/cxl-mailbox-utils.c
> @@ -64,6 +64,7 @@ enum {
>          #define SET_LSA       0x3
>      MEDIA_AND_POISON = 0x43,
>          #define GET_POISON_LIST        0x0
> +        #define INJECT_POISON          0x1
>  };
>  
>  struct cxl_cmd;
> @@ -436,6 +437,43 @@ static CXLRetCode cmd_media_get_poison_list(struct cxl_cmd *cmd,
>      return CXL_MBOX_SUCCESS;
>  }
>  
> +static CXLRetCode cmd_media_inject_poison(struct cxl_cmd *cmd,
> +                                          CXLDeviceState *cxl_dstate,
> +                                          uint16_t *len)
> +{
> +    CXLType3Dev *ct3d = container_of(cxl_dstate, CXLType3Dev, cxl_dstate);
> +    CXLPoisonList *poison_list = &ct3d->poison_list;
> +    CXLPoison *ent;
> +    struct inject_poison_pl {
> +        uint64_t dpa;
> +    };
> +    struct inject_poison_pl *in = (void *)cmd->payload;
> +    CXLPoison *p;
> +
> +    QLIST_FOREACH(ent, poison_list, node) {
> +        if (ent->start == in->dpa && ent->length == 64) {

How does this interact with the QMP inject poison?  Should this be
checking the range of the entries?

Ira

> +            return CXL_MBOX_SUCCESS;
> +        }
> +    }
> +
> +    if (ct3d->poison_list_cnt == CXL_POISON_LIST_LIMIT) {
> +        return CXL_MBOX_INJECT_POISON_LIMIT;
> +    }
> +    p = g_new0(CXLPoison, 1);
> +
> +    p->length = 64;
> +    p->start = in->dpa;
> +    p->type = CXL_POISON_TYPE_INJECTED;
> +
> +    /*
> +     * Possible todo: Merge with existing entry if next to it and if same type
> +     */
> +    QLIST_INSERT_HEAD(poison_list, p, node);
> +    ct3d->poison_list_cnt++;
> +
> +    return CXL_MBOX_SUCCESS;
> +}
> +
>  #define IMMEDIATE_CONFIG_CHANGE (1 << 1)
>  #define IMMEDIATE_DATA_CHANGE (1 << 2)
>  #define IMMEDIATE_POLICY_CHANGE (1 << 3)
> @@ -465,6 +503,8 @@ static struct cxl_cmd cxl_cmd_set[256][256] = {
>          ~0, IMMEDIATE_CONFIG_CHANGE | IMMEDIATE_DATA_CHANGE },
>      [MEDIA_AND_POISON][GET_POISON_LIST] = { "MEDIA_AND_POISON_GET_POISON_LIST",
>          cmd_media_get_poison_list, 16, 0 },
> +    [MEDIA_AND_POISON][INJECT_POISON] = { "MEDIA_AND_POISON_INJECT_POISON",
> +        cmd_media_inject_poison, 8, 0 },
>  };
>  
>  void cxl_process_mailbox(CXLDeviceState *cxl_dstate)
> -- 
> 2.37.2
>