Re: [ndctl PATCH v4 17/17] cxl: add health information to cxl-list

["Verma, Vishal L" <vishal.l.verma@intel.com>]

On Thu, 2021-10-07 at 02:21 -0600, Vishal Verma wrote:
> Add JSON output for fields from the 'GET_HEALTH_INFO' mailbox command
> to memory device listings.
> 
> Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
> ---
>  Documentation/cxl/cxl-list.txt |   4 +
>  util/json.h                    |   1 +
>  cxl/list.c                     |   5 +
>  util/json.c                    | 189 +++++++++++++++++++++++++++++++++
>  4 files changed, 199 insertions(+)
> 
> diff --git a/Documentation/cxl/cxl-list.txt b/Documentation/cxl/cxl-list.txt
> index bd377b3..dc86651 100644
> --- a/Documentation/cxl/cxl-list.txt
> +++ b/Documentation/cxl/cxl-list.txt
> @@ -53,6 +53,10 @@ OPTIONS
>  --idle::
>  	Include idle (not enabled / zero-sized) devices in the listing
>  
> +-H::
> +--health::
> +	Include health information in the memdev listing
> +
>  include::human-option.txt[]
>  
>  include::verbose-option.txt[]
> diff --git a/util/json.h b/util/json.h
> index 91918c8..ce575e6 100644
> --- a/util/json.h
> +++ b/util/json.h
> @@ -19,6 +19,7 @@ enum util_json_flags {
>  	UTIL_JSON_CONFIGURED	= (1 << 7),
>  	UTIL_JSON_FIRMWARE	= (1 << 8),
>  	UTIL_JSON_DAX_MAPPINGS	= (1 << 9),
> +	UTIL_JSON_HEALTH	= (1 << 10),
>  };
>  
>  struct json_object;
> diff --git a/cxl/list.c b/cxl/list.c
> index 3dea73f..2fa155a 100644
> --- a/cxl/list.c
> +++ b/cxl/list.c
> @@ -16,6 +16,7 @@ static struct {
>  	bool memdevs;
>  	bool idle;
>  	bool human;
> +	bool health;
>  } list;
>  
>  static unsigned long listopts_to_flags(void)
> @@ -26,6 +27,8 @@ static unsigned long listopts_to_flags(void)
>  		flags |= UTIL_JSON_IDLE;
>  	if (list.human)
>  		flags |= UTIL_JSON_HUMAN;
> +	if (list.health)
> +		flags |= UTIL_JSON_HEALTH;
>  	return flags;
>  }
>  
> @@ -57,6 +60,8 @@ int cmd_list(int argc, const char **argv, struct cxl_ctx *ctx)
>  		OPT_BOOLEAN('i', "idle", &list.idle, "include idle devices"),
>  		OPT_BOOLEAN('u', "human", &list.human,
>  				"use human friendly number formats "),
> +		OPT_BOOLEAN('H', "health", &list.health,
> +				"include memory device health information "),
>  		OPT_END(),
>  	};
>  	const char * const u[] = {
> diff --git a/util/json.c b/util/json.c
> index 3be3a92..dfc7b8e 100644
> --- a/util/json.c
> +++ b/util/json.c
> @@ -1442,6 +1442,190 @@ struct json_object *util_badblock_rec_to_json(u64 block, u64 count,
>  	return NULL;
>  }
>  
> +static struct json_object *util_cxl_memdev_health_to_json(
> +		struct cxl_memdev *memdev, unsigned long flags)
> +{
> +	const char *devname = cxl_memdev_get_devname(memdev);
> +	struct json_object *jhealth;
> +	struct json_object *jobj;
> +	struct cxl_cmd *cmd;
> +	u32 field;
> +	int rc;
> +
> +	jhealth = json_object_new_object();
> +	if (!jhealth)
> +		return NULL;
> +	if (!memdev)
> +		goto err_jobj;
> +
> +	cmd = cxl_cmd_new_get_health_info(memdev);
> +	if (!cmd)
> +		goto err_jobj;
> +
> +	rc = cxl_cmd_submit(cmd);
> +	/* ENOTTY - command not supported by the memdev */
> +	if (rc == -ENOTTY)
> +		goto err_cmd;

I'll remove this special case, as well as the error prints below. The
cmd submission could fail for any number of reasons, including
unsupported by hardware - I think for any of those cases, we can just
silently skip printing the json fields here.

> +	if (rc < 0) {
> +		fprintf(stderr, "%s: cmd submission failed: %s\n", devname,
> +		    strerror(-rc));
> +		goto err_cmd;
> +	}
> +	rc = cxl_cmd_get_mbox_status(cmd);
> +	if (rc != 0) {
> +		fprintf(stderr, "%s: firmware status: %d\n", devname, rc);
> +		rc = -ENXIO;
> +		goto err_cmd;
> +	}
> +
>