Re: [PATCH v3 4/4] hw/blocl/nvme: trigger async event during injecting smart warning

[Klaus Jensen]

On Jan 14 15:22, zhenwei pi wrote:
> During smart critical warning injection by setting property from QMP
> command, also try to trigger asynchronous event.
> 
> Signed-off-by: zhenwei pi <pizhenwei@bytedance.com>
> ---
>  hw/block/nvme.c | 47 ++++++++++++++++++++++++++++++++++++++++-------
>  1 file changed, 40 insertions(+), 7 deletions(-)
> 
> diff --git a/hw/block/nvme.c b/hw/block/nvme.c
> index ce9a9c9023..1feb603471 100644
> --- a/hw/block/nvme.c
> +++ b/hw/block/nvme.c
> @@ -847,6 +847,36 @@ static void nvme_enqueue_event(NvmeCtrl *n, uint8_t 
> event_type,
>      nvme_process_aers(n);
>  }
>  
> +static void nvme_enqueue_smart_event(NvmeCtrl *n, uint8_t event)

Maybe rename to just nvme_smart_event, since it is conditional if it
enqueues anything.

> +{
> +    uint8_t aer_info;
> +
> +    if (!(NVME_AEC_SMART(n->features.async_config) & event)) {
> +        return;
> +    }
> +
> +    /* Ref SPEC <Asynchronous Event Information ??? SMART / Health Status> */
> +    switch (event) {
> +    case NVME_SMART_SPARE:
> +        aer_info = NVME_AER_INFO_SMART_SPARE_THRESH;
> +        break;
> +    case NVME_SMART_TEMPERATURE:
> +        aer_info = NVME_AER_INFO_SMART_TEMP_THRESH;
> +        break;
> +    case NVME_SMART_RELIABILITY:
> +    case NVME_SMART_MEDIA_READ_ONLY:
> +    case NVME_SMART_FAILED_VOLATILE_MEDIA:
> +        aer_info = NVME_AER_INFO_SMART_RELIABILITY;
> +        break;
> +    case NVME_SMART_PMR_UNRELIABLE:
> +        /* TODO if NVME_SMART_PMR_UNRELIABLE is defined in future */

Doesn't NVME_SMART_PMR_UNRELIABLE fall under the
NVME_AER_INFO_SMART_RELIABILITY SMART/Health information group? The spec
says that the PMR becoming unreliable can cause an AEN, so I think that
is the only group that is usable.

> +    default:
> +        return;
> +    }
> +
> +    nvme_enqueue_event(n, NVME_AER_TYPE_SMART, aer_info, 
> NVME_LOG_SMART_INFO);
> +}
> +
>  static void nvme_clear_events(NvmeCtrl *n, uint8_t event_type)
>  {
>      n->aer_mask &= ~(1 << event_type);
> @@ -1824,12 +1854,9 @@ static uint16_t nvme_set_feature(NvmeCtrl *n, 
> NvmeRequest *req)
>              return NVME_INVALID_FIELD | NVME_DNR;
>          }
>  
> -        if (((n->temperature >= n->features.temp_thresh_hi) ||
> -             (n->temperature <= n->features.temp_thresh_low)) &&
> -            NVME_AEC_SMART(n->features.async_config) & 
> NVME_SMART_TEMPERATURE) {
> -            nvme_enqueue_event(n, NVME_AER_TYPE_SMART,
> -                               NVME_AER_INFO_SMART_TEMP_THRESH,
> -                               NVME_LOG_SMART_INFO);
> +        if ((n->temperature >= n->features.temp_thresh_hi) ||
> +             (n->temperature <= n->features.temp_thresh_low)) {
> +            nvme_enqueue_smart_event(n, NVME_AER_INFO_SMART_TEMP_THRESH);
>          }
>  
>          break;
> @@ -2841,7 +2868,7 @@ static void nvme_set_smart_warning(Object *obj, Visitor 
> *v, const char *name,
>                                     void *opaque, Error **errp)
>  {
>      NvmeCtrl *s = NVME(obj);
> -    uint8_t value, cap = 0;
> +    uint8_t value, cap = 0, event;
>      uint64_t pmr_cap = CAP_PMR_MASK;
>  
>      if (!visit_type_uint8(v, name, &value, errp)) {
> @@ -2860,6 +2887,12 @@ static void nvme_set_smart_warning(Object *obj, 
> Visitor *v, const char *name,
>      }
>  
>      s->smart_critical_warning = value;
> +
> +    /* test each bit of uint8_t for smart.critical_warning */
> +    for (event = 0; event < 8; event++) {
> +        if (value & (1 << event))
> +            nvme_enqueue_smart_event(s, 1 << event);
> +    }

I suggest you add a NVME_SMART_WARN_MAX to the NvmeSmartWarn enum with
value '6' and use that instead of the literal '8'.

>  }
>  
>  static const VMStateDescription nvme_vmstate = {
> -- 
> 2.25.1
> 
> 

-- 
One of us - No more doubt, silence or taboo about mental illness.

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