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powerpc/papr_scm: Implement support for PAPR_PDSM_HEALTH

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This patch implements support for PDSM request 'PAPR_PDSM_HEALTH'
that returns a newly introduced 'struct nd_papr_pdsm_health' instance
containing dimm health information back to user space in response to
ND_CMD_CALL. This functionality is implemented in newly introduced
papr_pdsm_health() that queries the nvdimm health information and
then copies this information to the package payload whose layout is
defined by 'struct nd_papr_pdsm_health'.

Signed-off-by: Vaibhav Jain <vaibhav@linux.ibm.com>
Cc: "Aneesh Kumar K . V" <aneesh.kumar@linux.ibm.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Ira Weiny <ira.weiny@intel.com>
Link: https://lore.kernel.org/r/20200615124407.32596-7-vaibhav@linux.ibm.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Vaibhav Jain 2020-06-15 18:14:07 +05:30 committed by Dan Williams
parent f517f7925b
commit d35f18b554
2 changed files with 88 additions and 0 deletions
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37
arch/powerpc/include/uapi/asm/papr_pdsm.h
View File

@ -66,17 +66,54 @@
#define ND_PDSM_HDR_SIZE \
(sizeof(struct nd_pkg_pdsm) - ND_PDSM_PAYLOAD_MAX_SIZE)
/* Various nvdimm health indicators */
#define PAPR_PDSM_DIMM_HEALTHY 0
#define PAPR_PDSM_DIMM_UNHEALTHY 1
#define PAPR_PDSM_DIMM_CRITICAL 2
#define PAPR_PDSM_DIMM_FATAL 3
/*
* Struct exchanged between kernel & ndctl in for PAPR_PDSM_HEALTH
* Various flags indicate the health status of the dimm.
*
* extension_flags : Any extension fields present in the struct.
* dimm_unarmed : Dimm not armed. So contents wont persist.
* dimm_bad_shutdown : Previous shutdown did not persist contents.
* dimm_bad_restore : Contents from previous shutdown werent restored.
* dimm_scrubbed : Contents of the dimm have been scrubbed.
* dimm_locked : Contents of the dimm cant be modified until CEC reboot
* dimm_encrypted : Contents of dimm are encrypted.
* dimm_health : Dimm health indicator. One of PAPR_PDSM_DIMM_XXXX
*/
struct nd_papr_pdsm_health {
union {
struct {
__u32 extension_flags;
__u8 dimm_unarmed;
__u8 dimm_bad_shutdown;
__u8 dimm_bad_restore;
__u8 dimm_scrubbed;
__u8 dimm_locked;
__u8 dimm_encrypted;
__u16 dimm_health;
};
__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
*/
enum papr_pdsm {
PAPR_PDSM_MIN = 0x0,
PAPR_PDSM_HEALTH,
PAPR_PDSM_MAX,
};
/* Maximal union that can hold all possible payload types */
union nd_pdsm_payload {
struct nd_papr_pdsm_health health;
__u8 buf[ND_PDSM_PAYLOAD_MAX_SIZE];
} __packed;

51
arch/powerpc/platforms/pseries/papr_scm.c
View File

@ -416,6 +416,52 @@ static int is_cmd_valid(struct nvdimm *nvdimm, unsigned int cmd, void *buf,
return 0;
}
/* Fetch the DIMM health info and populate it in provided package. */
static int papr_pdsm_health(struct papr_scm_priv *p,
union nd_pdsm_payload *payload)
{
int rc;
/* Ensure dimm health mutex is taken preventing concurrent access */
rc = mutex_lock_interruptible(&p->health_mutex);
if (rc)
goto out;
/* Always fetch upto date dimm health data ignoring cached values */
rc = __drc_pmem_query_health(p);
if (rc) {
mutex_unlock(&p->health_mutex);
goto out;
}
/* update health struct with various flags derived from health bitmap */
payload->health = (struct nd_papr_pdsm_health) {
.extension_flags = 0,
.dimm_unarmed = !!(p->health_bitmap & PAPR_PMEM_UNARMED_MASK),
.dimm_bad_shutdown = !!(p->health_bitmap & PAPR_PMEM_BAD_SHUTDOWN_MASK),
.dimm_bad_restore = !!(p->health_bitmap & PAPR_PMEM_BAD_RESTORE_MASK),
.dimm_scrubbed = !!(p->health_bitmap & PAPR_PMEM_SCRUBBED_AND_LOCKED),
.dimm_locked = !!(p->health_bitmap & PAPR_PMEM_SCRUBBED_AND_LOCKED),
.dimm_encrypted = !!(p->health_bitmap & PAPR_PMEM_ENCRYPTED),
.dimm_health = PAPR_PDSM_DIMM_HEALTHY,
};
/* Update field dimm_health based on health_bitmap flags */
if (p->health_bitmap & PAPR_PMEM_HEALTH_FATAL)
payload->health.dimm_health = PAPR_PDSM_DIMM_FATAL;
else if (p->health_bitmap & PAPR_PMEM_HEALTH_CRITICAL)
payload->health.dimm_health = PAPR_PDSM_DIMM_CRITICAL;
else if (p->health_bitmap & PAPR_PMEM_HEALTH_UNHEALTHY)
payload->health.dimm_health = PAPR_PDSM_DIMM_UNHEALTHY;
/* struct populated hence can release the mutex now */
mutex_unlock(&p->health_mutex);
rc = sizeof(struct nd_papr_pdsm_health);
out:
return rc;
}
/*
* 'struct pdsm_cmd_desc'
* Identifies supported PDSMs' expected length of in/out payloads
@ -444,6 +490,11 @@ static const struct pdsm_cmd_desc __pdsm_cmd_descriptors[] = {
},
/* New PDSM command descriptors to be added below */
[PAPR_PDSM_HEALTH] = {
.size_in = 0,
.size_out = sizeof(struct nd_papr_pdsm_health),
.service = papr_pdsm_health,
},
/* Empty */
[PAPR_PDSM_MAX] = {
.size_in = 0,