@@ -116,6 +116,22 @@ struct nd_papr_pdsm_health {
};
};
+/* Flags for injecting specific smart errors */
+#define PDSM_SMART_INJECT_HEALTH_FATAL (1 << 0)
+#define PDSM_SMART_INJECT_BAD_SHUTDOWN (1 << 1)
+
+struct nd_papr_pdsm_smart_inject {
+ union {
+ struct {
+ /* One or more of PDSM_SMART_INJECT_ */
+ __u32 flags;
+ __u8 fatal_enable;
+ __u8 unsafe_shutdown_enable;
+ };
+ __u8 buf[ND_PDSM_PAYLOAD_MAX_SIZE];
+ };
+};
+
/*
* Methods to be embedded in ND_CMD_CALL request. These are sent to the kernel
* via 'nd_cmd_pkg.nd_command' member of the ioctl struct
@@ -123,12 +139,14 @@ struct nd_papr_pdsm_health {
enum papr_pdsm {
PAPR_PDSM_MIN = 0x0,
PAPR_PDSM_HEALTH,
+ PAPR_PDSM_SMART_INJECT,
PAPR_PDSM_MAX,
};
/* Maximal union that can hold all possible payload types */
union nd_pdsm_payload {
struct nd_papr_pdsm_health health;
+ struct nd_papr_pdsm_smart_inject smart_inject;
__u8 buf[ND_PDSM_PAYLOAD_MAX_SIZE];
} __packed;
@@ -68,6 +68,10 @@
#define PAPR_SCM_PERF_STATS_EYECATCHER __stringify(SCMSTATS)
#define PAPR_SCM_PERF_STATS_VERSION 0x1
+/* Use bitblt method to override specific bits in the '_bitmap_' */
+#define BITBLT_BITMAP(_bitmap_, _mask_, _override_) \
+ (((_bitmap_) & ~(_mask_)) | ((_mask_) & (_override_)))
+
/* Struct holding a single performance metric */
struct papr_scm_perf_stat {
u8 stat_id[8];
@@ -120,6 +124,12 @@ struct papr_scm_priv {
/* length of the stat buffer as expected by phyp */
size_t stat_buffer_len;
+
+ /* The bits which needs to be overridden */
+ u64 health_bitmap_mask;
+
+ /* The overridden values for the bits having the masks set */
+ u64 health_bitmap_override;
};
static int papr_scm_pmem_flush(struct nd_region *nd_region,
@@ -347,19 +357,28 @@ static ssize_t drc_pmem_query_stats(struct papr_scm_priv *p,
static int __drc_pmem_query_health(struct papr_scm_priv *p)
{
unsigned long ret[PLPAR_HCALL_BUFSIZE];
+ u64 bitmap = 0;
long rc;
/* issue the hcall */
rc = plpar_hcall(H_SCM_HEALTH, ret, p->drc_index);
- if (rc != H_SUCCESS) {
+ if (rc == H_SUCCESS)
+ bitmap = ret[0] & ret[1];
+ else if (rc == H_FUNCTION)
+ dev_info_once(&p->pdev->dev,
+ "Hcall H_SCM_HEALTH not implemented, assuming empty health bitmap");
+ else {
+
dev_err(&p->pdev->dev,
"Failed to query health information, Err:%ld\n", rc);
return -ENXIO;
}
p->lasthealth_jiffies = jiffies;
- p->health_bitmap = ret[0] & ret[1];
-
+ /* Allow overriding specific health bits via bit blt. */
+ bitmap = BITBLT_BITMAP(bitmap, p->health_bitmap_mask,
+ p->health_bitmap_override);
+ WRITE_ONCE(p->health_bitmap, bitmap);
dev_dbg(&p->pdev->dev,
"Queried dimm health info. Bitmap:0x%016lx Mask:0x%016lx\n",
ret[0], ret[1]);
@@ -669,6 +688,54 @@ static int papr_pdsm_health(struct papr_scm_priv *p,
return rc;
}
+/* Inject a smart error Add the dirty-shutdown-counter value to the pdsm */
+static int papr_pdsm_smart_inject(struct papr_scm_priv *p,
+ union nd_pdsm_payload *payload)
+{
+ int rc;
+ u32 supported_flags = 0;
+ u64 mask = 0, override = 0;
+
+ /* Check for individual smart error flags and update mask and override */
+ if (payload->smart_inject.flags & PDSM_SMART_INJECT_HEALTH_FATAL) {
+ supported_flags |= PDSM_SMART_INJECT_HEALTH_FATAL;
+ mask |= PAPR_PMEM_HEALTH_FATAL;
+ override |= payload->smart_inject.fatal_enable ?
+ PAPR_PMEM_HEALTH_FATAL : 0;
+ }
+
+ if (payload->smart_inject.flags & PDSM_SMART_INJECT_BAD_SHUTDOWN) {
+ supported_flags |= PDSM_SMART_INJECT_BAD_SHUTDOWN;
+ mask |= PAPR_PMEM_SHUTDOWN_DIRTY;
+ override |= payload->smart_inject.unsafe_shutdown_enable ?
+ PAPR_PMEM_SHUTDOWN_DIRTY : 0;
+ }
+
+ dev_dbg(&p->pdev->dev, "[Smart-inject] Mask=%#llx override=%#llx\n",
+ mask, override);
+
+ /* Prevent concurrent access to dimm health bitmap related members */
+ rc = mutex_lock_interruptible(&p->health_mutex);
+ if (rc)
+ return rc;
+
+ /* Bitblt mask/override to corrosponding health_bitmap couterparts */
+ p->health_bitmap_mask = BITBLT_BITMAP(p->health_bitmap_mask,
+ mask, override);
+ p->health_bitmap_override = BITBLT_BITMAP(p->health_bitmap_override,
+ mask, override);
+
+ /* Invalidate cached health bitmap */
+ p->lasthealth_jiffies = 0;
+
+ mutex_unlock(&p->health_mutex);
+
+ /* Return the supported flags back to userspace */
+ payload->smart_inject.flags = supported_flags;
+
+ return sizeof(struct nd_papr_pdsm_health);
+}
+
/*
* 'struct pdsm_cmd_desc'
* Identifies supported PDSMs' expected length of in/out payloads
@@ -702,6 +769,12 @@ static const struct pdsm_cmd_desc __pdsm_cmd_descriptors[] = {
.size_out = sizeof(struct nd_papr_pdsm_health),
.service = papr_pdsm_health,
},
+
+ [PAPR_PDSM_SMART_INJECT] = {
+ .size_in = sizeof(struct nd_papr_pdsm_smart_inject),
+ .size_out = sizeof(struct nd_papr_pdsm_smart_inject),
+ .service = papr_pdsm_smart_inject,
+ },
/* Empty */
[PAPR_PDSM_MAX] = {
.size_in = 0,
@@ -838,6 +911,20 @@ static int papr_scm_ndctl(struct nvdimm_bus_descriptor *nd_desc,
return 0;
}
+static ssize_t health_bitmap_override_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);
+
+ return sprintf(buf, "mask=%#llx override=%#llx\n",
+ READ_ONCE(p->health_bitmap_mask),
+ READ_ONCE(p->health_bitmap_override));
+}
+
+static DEVICE_ATTR_ADMIN_RO(health_bitmap_override);
+
static ssize_t perf_stats_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
@@ -952,6 +1039,7 @@ static struct attribute *papr_nd_attributes[] = {
&dev_attr_flags.attr,
&dev_attr_perf_stats.attr,
&dev_attr_dirty_shutdown.attr,
+ &dev_attr_health_bitmap_override.attr,
NULL,
};