@@ -22,6 +22,16 @@
(1ul << ND_CMD_GET_CONFIG_DATA) | \
(1ul << ND_CMD_SET_CONFIG_DATA))
+#define PAPR_SCM_MAX_PERF_STAT 4096
+
+/* Buffer layout returned by phyp when reporting drc perf stats */
+struct papr_scm_perf_stats {
+ uint8_t version; /* Should be 0x01 */
+ uint8_t reserved1;
+ __be16 size; /* Size of this struct in bytes */
+ uint8_t buffer[]; /* Performance matrics */
+} __packed;
+
struct papr_scm_priv {
struct platform_device *pdev;
struct device_node *dn;
@@ -148,6 +158,25 @@ static int drc_pmem_query_n_bind(struct papr_scm_priv *p)
return drc_pmem_bind(p);
}
+static int drc_pmem_query_stats(struct papr_scm_priv *p,
+ struct papr_scm_perf_stats *stats)
+{
+ unsigned long ret[PLPAR_HCALL_BUFSIZE];
+ int64_t rc;
+
+ if (!stats)
+ return -EINVAL;
+
+ rc = plpar_hcall(H_SCM_PERFORMANCE_STATS, ret, p->drc_index,
+ __pa(stats));
+ if (rc != H_SUCCESS) {
+ dev_err(&p->pdev->dev,
+ "Failed to query performance stats, Err:%lld\n", rc);
+ return -ENXIO;
+ } else
+ return 0;
+}
+
static int drc_pmem_query_health(struct papr_scm_priv *p)
{
unsigned long ret[PLPAR_HCALL_BUFSIZE];
@@ -332,6 +361,32 @@ static inline int papr_scm_node(int node)
return min_node;
}
+static ssize_t papr_stats_version_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct nvdimm *dimm = to_nvdimm(dev);
+ struct papr_scm_priv *p = nvdimm_provider_data(dimm);
+ struct papr_scm_perf_stats *retbuffer;
+ int rc;
+
+ /* Return buffer for phyp where stats are written */
+ retbuffer = kzalloc(PAPR_SCM_MAX_PERF_STAT, GFP_KERNEL);
+ if (!retbuffer)
+ return -ENOMEM;
+
+ rc = drc_pmem_query_stats(p, retbuffer);
+ if (rc)
+ goto out;
+ else
+ rc = sprintf(buf, "%d\n", retbuffer->version);
+
+out:
+ kfree(retbuffer);
+ return rc;
+
+}
+DEVICE_ATTR_RO(papr_stats_version);
+
static ssize_t papr_health_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
@@ -353,6 +408,7 @@ DEVICE_ATTR_RO(papr_health);
/* papr_scm specific dimm attributes */
static struct attribute *papr_scm_nd_attributes[] = {
&dev_attr_papr_health.attr,
+ &dev_attr_papr_stats_version.attr,
NULL,
};
Implement support for fetching dimm performance metrics via H_SCM_PERFORMANCE_HEALTH hcall as documented in Ref[1]. The hcall returns a structure as described in Ref[1] and defined as newly introduced 'struct papr_scm_perf_stats'. The struct has a header followed by key-value pairs of performance attributes. The module 'papr_scm' however doesn't interpret or parses these performance attributes as it will be returning this buffer as it is to user-space for further parsing. For now we only implement a dimm specific sysfs attribute named 'papr_stats_version' that returns the version of the structure returned from H_SCM_PERFORMANCE_HEALTH hcall. Hence this patch implements a new function drc_pmem_query_stats() that issues hcall H_SCM_PERFORMANCE_HEALTH ,requesting PHYP to store performance stats in pre-allocated 'struct papr_scm_perf_stats' buffer 'stats'. References: [1]: https://patchwork.ozlabs.org/patch/1154292/ Signed-off-by: Vaibhav Jain <vaibhav@linux.ibm.com> --- arch/powerpc/platforms/pseries/papr_scm.c | 56 +++++++++++++++++++++++ 1 file changed, 56 insertions(+)