| Message ID | 20200604234136.253703-7-vaibhav@linux.ibm.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | powerpc/papr_scm: Add support for reporting nvdimm health | expand |
On Fri, Jun 05, 2020 at 05:11:36AM +0530, Vaibhav Jain wrote: > 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'. > > 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> > Signed-off-by: Vaibhav Jain <vaibhav@linux.ibm.com> > --- > Changelog: > > v9..v10: > * Removed code in papr_pdsm_health that performed validation on pdsm > payload version and corrosponding struct and defines used for > validation of payload version. > * Dropped usage of struct papr_pdsm_health in 'struct > papr_scm_priv'. Instead papr_psdm_health() now uses > 'papr_scm_priv.health_bitmap' to populate the pdsm payload. > * Above change also fixes the problem where this patch was removing > the code that was previously introduced in this patch-series. > [ Ira ] > * Introduced a new def ND_PDSM_ENVELOPE_HDR_SIZE that indicates the > space allocated to 'struct nd_pdsm_cmd_pkg' fields except 'struct > nd_cmd_pkg'. This def is useful in validating payload sizes. > * Reworked papr_pdsm_health() to enforce a specific payload size for > 'PAPR_PDSM_HEALTH' pdsm request. > > Resend: > * Added ack from Aneesh. > > v8..v9: > * s/PAPR_SCM_PDSM_HEALTH/PAPR_PDSM_HEALTH/g [ Dan , Aneesh ] > * s/PAPR_SCM_PSDM_DIMM_*/PAPR_PDSM_DIMM_*/g > * Renamed papr_scm_get_health() to papr_psdm_health() > * Updated patch description to replace papr-scm dimm with nvdimm. > > v7..v8: > * None > > Resend: > * None > > v6..v7: > * Updated flags_show() to use seq_buf_printf(). [Mpe] > * Updated papr_scm_get_health() to use newly introduced > __drc_pmem_query_health() bypassing the cache [Mpe]. > > v5..v6: > * Added attribute '__packed' to 'struct nd_papr_pdsm_health_v1' to > gaurd against possibility of different compilers adding different > paddings to the struct [ Dan Williams ] > > * Updated 'struct nd_papr_pdsm_health_v1' to use __u8 instead of > 'bool' and also updated drc_pmem_query_health() to take this into > account. [ Dan Williams ] > > v4..v5: > * None > > v3..v4: > * Call the DSM_PAPR_SCM_HEALTH service function from > papr_scm_service_dsm() instead of papr_scm_ndctl(). [Aneesh] > > v2..v3: > * Updated struct nd_papr_scm_dimm_health_stat_v1 to use '__xx' types > as its exported to the userspace [Aneesh] > * Changed the constants DSM_PAPR_SCM_DIMM_XX indicating dimm health > from enum to #defines [Aneesh] > > v1..v2: > * New patch in the series > --- > arch/powerpc/include/uapi/asm/papr_pdsm.h | 33 +++++++++++ > arch/powerpc/platforms/pseries/papr_scm.c | 70 +++++++++++++++++++++++ > 2 files changed, 103 insertions(+) > > diff --git a/arch/powerpc/include/uapi/asm/papr_pdsm.h b/arch/powerpc/include/uapi/asm/papr_pdsm.h > index 8b1a4f8fa316..c4c990ede5d4 100644 > --- a/arch/powerpc/include/uapi/asm/papr_pdsm.h > +++ b/arch/powerpc/include/uapi/asm/papr_pdsm.h > @@ -71,12 +71,17 @@ struct nd_pdsm_cmd_pkg { > __u8 payload[]; /* In/Out: Sub-cmd data buffer */ > } __packed; > > +/* Calculate size used by the pdsm header fields minus 'struct nd_cmd_pkg' */ > +#define ND_PDSM_ENVELOPE_HDR_SIZE \ > + (sizeof(struct nd_pdsm_cmd_pkg) - sizeof(struct nd_cmd_pkg)) > + This is kind of a weird name for this. Isn't this just the ND PDSM header size? What is 'envelope' mean here? > /* > * Methods to be embedded in ND_CMD_CALL request. These are sent to the kernel > * via 'nd_pdsm_cmd_pkg.hdr.nd_command' member of the ioctl struct > */ > enum papr_pdsm { > PAPR_PDSM_MIN = 0x0, > + PAPR_PDSM_HEALTH, > PAPR_PDSM_MAX, > }; > > @@ -95,4 +100,32 @@ static inline void *pdsm_cmd_to_payload(struct nd_pdsm_cmd_pkg *pcmd) > return (void *)(pcmd->payload); > } > > +/* 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. > + * > + * 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 { > + __u8 dimm_unarmed; > + __u8 dimm_bad_shutdown; > + __u8 dimm_bad_restore; > + __u8 dimm_scrubbed; > + __u8 dimm_locked; > + __u8 dimm_encrypted; > + __u16 dimm_health; > +} __packed; > + > #endif /* _UAPI_ASM_POWERPC_PAPR_PDSM_H_ */ > diff --git a/arch/powerpc/platforms/pseries/papr_scm.c b/arch/powerpc/platforms/pseries/papr_scm.c > index 05eb56ecab5e..984942be24c1 100644 > --- a/arch/powerpc/platforms/pseries/papr_scm.c > +++ b/arch/powerpc/platforms/pseries/papr_scm.c > @@ -421,6 +421,72 @@ 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, > + struct nd_pdsm_cmd_pkg *pkg) > +{ > + int rc; > + struct nd_papr_pdsm_health health = { 0 }; > + u16 copysize = sizeof(struct nd_papr_pdsm_health); > + u16 payload_size = pkg->hdr.nd_size_out - ND_PDSM_ENVELOPE_HDR_SIZE; > + > + /* Ensure correct payload size that can hold struct nd_papr_pdsm_health */ > + if (payload_size != copysize) { > + dev_dbg(&p->pdev->dev, > + "Unexpected payload-size (%u). Expected (%u)", > + pkg->hdr.nd_size_out, copysize); > + rc = -ENOSPC; > + goto out; > + } > + > + /* 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 */ > + health = (struct nd_papr_pdsm_health) { > + .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_encrypted = p->health_bitmap & PAPR_PMEM_ENCRYPTED, > + .dimm_locked = p->health_bitmap & PAPR_PMEM_SCRUBBED_AND_LOCKED, > + .dimm_scrubbed = p->health_bitmap & PAPR_PMEM_SCRUBBED_AND_LOCKED, Are you sure these work? These are not assignments to a bool so I don't think gcc will do what you want here. Ira > + .dimm_health = PAPR_PDSM_DIMM_HEALTHY, > + }; > + > + /* Update field dimm_health based on health_bitmap flags */ > + if (p->health_bitmap & PAPR_PMEM_HEALTH_FATAL) > + health.dimm_health = PAPR_PDSM_DIMM_FATAL; > + else if (p->health_bitmap & PAPR_PMEM_HEALTH_CRITICAL) > + health.dimm_health = PAPR_PDSM_DIMM_CRITICAL; > + else if (p->health_bitmap & PAPR_PMEM_HEALTH_UNHEALTHY) > + health.dimm_health = PAPR_PDSM_DIMM_UNHEALTHY; > + > + /* struct populated hence can release the mutex now */ > + mutex_unlock(&p->health_mutex); > + > + dev_dbg(&p->pdev->dev, "Copying payload size=%u\n", copysize); > + > + /* Copy the health struct to the payload */ > + memcpy(pdsm_cmd_to_payload(pkg), &health, copysize); > + > + /* Update fw size including size of struct nd_pdsm_cmd_pkg fields */ > + pkg->hdr.nd_fw_size = copysize + ND_PDSM_ENVELOPE_HDR_SIZE; > + > +out: > + dev_dbg(&p->pdev->dev, "completion code = %d\n", rc); > + > + return rc; > +} > + > /* > * For a given pdsm request call an appropriate service function. > * Note: Use 'nd_pdsm_cmd_pkg.cmd_status to report psdm servicing errors. Hence > @@ -435,6 +501,10 @@ static void papr_scm_service_pdsm(struct papr_scm_priv *p, > > /* Call pdsm service function */ > switch (pdsm) { > + case PAPR_PDSM_HEALTH: > + pkg->cmd_status = papr_pdsm_health(p, pkg); > + break; > + > default: > dev_dbg(&p->pdev->dev, "PDSM[0x%x]: Unsupported PDSM request\n", > pdsm); > -- > 2.26.2 >
Ira Weiny <ira.weiny@intel.com> writes: > On Fri, Jun 05, 2020 at 05:11:36AM +0530, Vaibhav Jain wrote: >> 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'. >> >> 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> >> Signed-off-by: Vaibhav Jain <vaibhav@linux.ibm.com> >> --- >> Changelog: >> >> v9..v10: >> * Removed code in papr_pdsm_health that performed validation on pdsm >> payload version and corrosponding struct and defines used for >> validation of payload version. >> * Dropped usage of struct papr_pdsm_health in 'struct >> papr_scm_priv'. Instead papr_psdm_health() now uses >> 'papr_scm_priv.health_bitmap' to populate the pdsm payload. >> * Above change also fixes the problem where this patch was removing >> the code that was previously introduced in this patch-series. >> [ Ira ] >> * Introduced a new def ND_PDSM_ENVELOPE_HDR_SIZE that indicates the >> space allocated to 'struct nd_pdsm_cmd_pkg' fields except 'struct >> nd_cmd_pkg'. This def is useful in validating payload sizes. >> * Reworked papr_pdsm_health() to enforce a specific payload size for >> 'PAPR_PDSM_HEALTH' pdsm request. >> >> Resend: >> * Added ack from Aneesh. >> >> v8..v9: >> * s/PAPR_SCM_PDSM_HEALTH/PAPR_PDSM_HEALTH/g [ Dan , Aneesh ] >> * s/PAPR_SCM_PSDM_DIMM_*/PAPR_PDSM_DIMM_*/g >> * Renamed papr_scm_get_health() to papr_psdm_health() >> * Updated patch description to replace papr-scm dimm with nvdimm. >> >> v7..v8: >> * None >> >> Resend: >> * None >> >> v6..v7: >> * Updated flags_show() to use seq_buf_printf(). [Mpe] >> * Updated papr_scm_get_health() to use newly introduced >> __drc_pmem_query_health() bypassing the cache [Mpe]. >> >> v5..v6: >> * Added attribute '__packed' to 'struct nd_papr_pdsm_health_v1' to >> gaurd against possibility of different compilers adding different >> paddings to the struct [ Dan Williams ] >> >> * Updated 'struct nd_papr_pdsm_health_v1' to use __u8 instead of >> 'bool' and also updated drc_pmem_query_health() to take this into >> account. [ Dan Williams ] >> >> v4..v5: >> * None >> >> v3..v4: >> * Call the DSM_PAPR_SCM_HEALTH service function from >> papr_scm_service_dsm() instead of papr_scm_ndctl(). [Aneesh] >> >> v2..v3: >> * Updated struct nd_papr_scm_dimm_health_stat_v1 to use '__xx' types >> as its exported to the userspace [Aneesh] >> * Changed the constants DSM_PAPR_SCM_DIMM_XX indicating dimm health >> from enum to #defines [Aneesh] >> >> v1..v2: >> * New patch in the series >> --- >> arch/powerpc/include/uapi/asm/papr_pdsm.h | 33 +++++++++++ >> arch/powerpc/platforms/pseries/papr_scm.c | 70 +++++++++++++++++++++++ >> 2 files changed, 103 insertions(+) >> >> diff --git a/arch/powerpc/include/uapi/asm/papr_pdsm.h b/arch/powerpc/include/uapi/asm/papr_pdsm.h >> index 8b1a4f8fa316..c4c990ede5d4 100644 >> --- a/arch/powerpc/include/uapi/asm/papr_pdsm.h >> +++ b/arch/powerpc/include/uapi/asm/papr_pdsm.h >> @@ -71,12 +71,17 @@ struct nd_pdsm_cmd_pkg { >> __u8 payload[]; /* In/Out: Sub-cmd data buffer */ >> } __packed; >> >> +/* Calculate size used by the pdsm header fields minus 'struct nd_cmd_pkg' */ >> +#define ND_PDSM_ENVELOPE_HDR_SIZE \ >> + (sizeof(struct nd_pdsm_cmd_pkg) - sizeof(struct nd_cmd_pkg)) >> + [ ] > > This is kind of a weird name for this. > > Isn't this just the ND PDSM header size? What is 'envelope' mean > here? Was referring to 'nd_cmd_pkg' envelop here. But yes removing 'ENVELOPE' should make it more concise. Have already done this in v11 of this patch. > >> /* >> * Methods to be embedded in ND_CMD_CALL request. These are sent to the kernel >> * via 'nd_pdsm_cmd_pkg.hdr.nd_command' member of the ioctl struct >> */ >> enum papr_pdsm { >> PAPR_PDSM_MIN = 0x0, >> + PAPR_PDSM_HEALTH, >> PAPR_PDSM_MAX, >> }; >> >> @@ -95,4 +100,32 @@ static inline void *pdsm_cmd_to_payload(struct nd_pdsm_cmd_pkg *pcmd) >> return (void *)(pcmd->payload); >> } >> >> +/* 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. >> + * >> + * 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 { >> + __u8 dimm_unarmed; >> + __u8 dimm_bad_shutdown; >> + __u8 dimm_bad_restore; >> + __u8 dimm_scrubbed; >> + __u8 dimm_locked; >> + __u8 dimm_encrypted; >> + __u16 dimm_health; >> +} __packed; >> + >> #endif /* _UAPI_ASM_POWERPC_PAPR_PDSM_H_ */ >> diff --git a/arch/powerpc/platforms/pseries/papr_scm.c b/arch/powerpc/platforms/pseries/papr_scm.c >> index 05eb56ecab5e..984942be24c1 100644 >> --- a/arch/powerpc/platforms/pseries/papr_scm.c >> +++ b/arch/powerpc/platforms/pseries/papr_scm.c >> @@ -421,6 +421,72 @@ 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, >> + struct nd_pdsm_cmd_pkg *pkg) >> +{ >> + int rc; >> + struct nd_papr_pdsm_health health = { 0 }; >> + u16 copysize = sizeof(struct nd_papr_pdsm_health); >> + u16 payload_size = pkg->hdr.nd_size_out - ND_PDSM_ENVELOPE_HDR_SIZE; >> + >> + /* Ensure correct payload size that can hold struct nd_papr_pdsm_health */ >> + if (payload_size != copysize) { >> + dev_dbg(&p->pdev->dev, >> + "Unexpected payload-size (%u). Expected (%u)", >> + pkg->hdr.nd_size_out, copysize); >> + rc = -ENOSPC; >> + goto out; >> + } >> + >> + /* 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 */ >> + health = (struct nd_papr_pdsm_health) { >> + .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_encrypted = p->health_bitmap & PAPR_PMEM_ENCRYPTED, >> + .dimm_locked = p->health_bitmap & PAPR_PMEM_SCRUBBED_AND_LOCKED, >> + .dimm_scrubbed = p->health_bitmap & PAPR_PMEM_SCRUBBED_AND_LOCKED, > > Are you sure these work? These are not assignments to a bool so I don't think > gcc will do what you want here. Yeah, somehow this slipped by and didnt show up in my tests. I checked the assembly dump and seems GCC was silently skipping initializing these fields without making any noise. Have rectified this in v11 by changing these designated initilizers to .dimm_locked = !!(p->health_bitmap & PAPR_PMEM_SCRUBBED_AND_LOCKED) Thanks for catching this. ~ Vaibhav > > Ira > >> + .dimm_health = PAPR_PDSM_DIMM_HEALTHY, >> + }; >> + >> + /* Update field dimm_health based on health_bitmap flags */ >> + if (p->health_bitmap & PAPR_PMEM_HEALTH_FATAL) >> + health.dimm_health = PAPR_PDSM_DIMM_FATAL; >> + else if (p->health_bitmap & PAPR_PMEM_HEALTH_CRITICAL) >> + health.dimm_health = PAPR_PDSM_DIMM_CRITICAL; >> + else if (p->health_bitmap & PAPR_PMEM_HEALTH_UNHEALTHY) >> + health.dimm_health = PAPR_PDSM_DIMM_UNHEALTHY; >> + >> + /* struct populated hence can release the mutex now */ >> + mutex_unlock(&p->health_mutex); >> + >> + dev_dbg(&p->pdev->dev, "Copying payload size=%u\n", copysize); >> + >> + /* Copy the health struct to the payload */ >> + memcpy(pdsm_cmd_to_payload(pkg), &health, copysize); >> + >> + /* Update fw size including size of struct nd_pdsm_cmd_pkg fields */ >> + pkg->hdr.nd_fw_size = copysize + ND_PDSM_ENVELOPE_HDR_SIZE; >> + >> +out: >> + dev_dbg(&p->pdev->dev, "completion code = %d\n", rc); >> + >> + return rc; >> +} >> + >> /* >> * For a given pdsm request call an appropriate service function. >> * Note: Use 'nd_pdsm_cmd_pkg.cmd_status to report psdm servicing errors. Hence >> @@ -435,6 +501,10 @@ static void papr_scm_service_pdsm(struct papr_scm_priv *p, >> >> /* Call pdsm service function */ >> switch (pdsm) { >> + case PAPR_PDSM_HEALTH: >> + pkg->cmd_status = papr_pdsm_health(p, pkg); >> + break; >> + >> default: >> dev_dbg(&p->pdev->dev, "PDSM[0x%x]: Unsupported PDSM request\n", >> pdsm); >> -- >> 2.26.2 >>
diff --git a/arch/powerpc/include/uapi/asm/papr_pdsm.h b/arch/powerpc/include/uapi/asm/papr_pdsm.h index 8b1a4f8fa316..c4c990ede5d4 100644 --- a/arch/powerpc/include/uapi/asm/papr_pdsm.h +++ b/arch/powerpc/include/uapi/asm/papr_pdsm.h @@ -71,12 +71,17 @@ struct nd_pdsm_cmd_pkg { __u8 payload[]; /* In/Out: Sub-cmd data buffer */ } __packed; +/* Calculate size used by the pdsm header fields minus 'struct nd_cmd_pkg' */ +#define ND_PDSM_ENVELOPE_HDR_SIZE \ + (sizeof(struct nd_pdsm_cmd_pkg) - sizeof(struct nd_cmd_pkg)) + /* * Methods to be embedded in ND_CMD_CALL request. These are sent to the kernel * via 'nd_pdsm_cmd_pkg.hdr.nd_command' member of the ioctl struct */ enum papr_pdsm { PAPR_PDSM_MIN = 0x0, + PAPR_PDSM_HEALTH, PAPR_PDSM_MAX, }; @@ -95,4 +100,32 @@ static inline void *pdsm_cmd_to_payload(struct nd_pdsm_cmd_pkg *pcmd) return (void *)(pcmd->payload); } +/* 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. + * + * 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 { + __u8 dimm_unarmed; + __u8 dimm_bad_shutdown; + __u8 dimm_bad_restore; + __u8 dimm_scrubbed; + __u8 dimm_locked; + __u8 dimm_encrypted; + __u16 dimm_health; +} __packed; + #endif /* _UAPI_ASM_POWERPC_PAPR_PDSM_H_ */ diff --git a/arch/powerpc/platforms/pseries/papr_scm.c b/arch/powerpc/platforms/pseries/papr_scm.c index 05eb56ecab5e..984942be24c1 100644 --- a/arch/powerpc/platforms/pseries/papr_scm.c +++ b/arch/powerpc/platforms/pseries/papr_scm.c @@ -421,6 +421,72 @@ 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, + struct nd_pdsm_cmd_pkg *pkg) +{ + int rc; + struct nd_papr_pdsm_health health = { 0 }; + u16 copysize = sizeof(struct nd_papr_pdsm_health); + u16 payload_size = pkg->hdr.nd_size_out - ND_PDSM_ENVELOPE_HDR_SIZE; + + /* Ensure correct payload size that can hold struct nd_papr_pdsm_health */ + if (payload_size != copysize) { + dev_dbg(&p->pdev->dev, + "Unexpected payload-size (%u). Expected (%u)", + pkg->hdr.nd_size_out, copysize); + rc = -ENOSPC; + goto out; + } + + /* 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 */ + health = (struct nd_papr_pdsm_health) { + .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_encrypted = p->health_bitmap & PAPR_PMEM_ENCRYPTED, + .dimm_locked = p->health_bitmap & PAPR_PMEM_SCRUBBED_AND_LOCKED, + .dimm_scrubbed = p->health_bitmap & PAPR_PMEM_SCRUBBED_AND_LOCKED, + .dimm_health = PAPR_PDSM_DIMM_HEALTHY, + }; + + /* Update field dimm_health based on health_bitmap flags */ + if (p->health_bitmap & PAPR_PMEM_HEALTH_FATAL) + health.dimm_health = PAPR_PDSM_DIMM_FATAL; + else if (p->health_bitmap & PAPR_PMEM_HEALTH_CRITICAL) + health.dimm_health = PAPR_PDSM_DIMM_CRITICAL; + else if (p->health_bitmap & PAPR_PMEM_HEALTH_UNHEALTHY) + health.dimm_health = PAPR_PDSM_DIMM_UNHEALTHY; + + /* struct populated hence can release the mutex now */ + mutex_unlock(&p->health_mutex); + + dev_dbg(&p->pdev->dev, "Copying payload size=%u\n", copysize); + + /* Copy the health struct to the payload */ + memcpy(pdsm_cmd_to_payload(pkg), &health, copysize); + + /* Update fw size including size of struct nd_pdsm_cmd_pkg fields */ + pkg->hdr.nd_fw_size = copysize + ND_PDSM_ENVELOPE_HDR_SIZE; + +out: + dev_dbg(&p->pdev->dev, "completion code = %d\n", rc); + + return rc; +} + /* * For a given pdsm request call an appropriate service function. * Note: Use 'nd_pdsm_cmd_pkg.cmd_status to report psdm servicing errors. Hence @@ -435,6 +501,10 @@ static void papr_scm_service_pdsm(struct papr_scm_priv *p, /* Call pdsm service function */ switch (pdsm) { + case PAPR_PDSM_HEALTH: + pkg->cmd_status = papr_pdsm_health(p, pkg); + break; + default: dev_dbg(&p->pdev->dev, "PDSM[0x%x]: Unsupported PDSM request\n", pdsm);
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'. 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> Signed-off-by: Vaibhav Jain <vaibhav@linux.ibm.com> --- Changelog: v9..v10: * Removed code in papr_pdsm_health that performed validation on pdsm payload version and corrosponding struct and defines used for validation of payload version. * Dropped usage of struct papr_pdsm_health in 'struct papr_scm_priv'. Instead papr_psdm_health() now uses 'papr_scm_priv.health_bitmap' to populate the pdsm payload. * Above change also fixes the problem where this patch was removing the code that was previously introduced in this patch-series. [ Ira ] * Introduced a new def ND_PDSM_ENVELOPE_HDR_SIZE that indicates the space allocated to 'struct nd_pdsm_cmd_pkg' fields except 'struct nd_cmd_pkg'. This def is useful in validating payload sizes. * Reworked papr_pdsm_health() to enforce a specific payload size for 'PAPR_PDSM_HEALTH' pdsm request. Resend: * Added ack from Aneesh. v8..v9: * s/PAPR_SCM_PDSM_HEALTH/PAPR_PDSM_HEALTH/g [ Dan , Aneesh ] * s/PAPR_SCM_PSDM_DIMM_*/PAPR_PDSM_DIMM_*/g * Renamed papr_scm_get_health() to papr_psdm_health() * Updated patch description to replace papr-scm dimm with nvdimm. v7..v8: * None Resend: * None v6..v7: * Updated flags_show() to use seq_buf_printf(). [Mpe] * Updated papr_scm_get_health() to use newly introduced __drc_pmem_query_health() bypassing the cache [Mpe]. v5..v6: * Added attribute '__packed' to 'struct nd_papr_pdsm_health_v1' to gaurd against possibility of different compilers adding different paddings to the struct [ Dan Williams ] * Updated 'struct nd_papr_pdsm_health_v1' to use __u8 instead of 'bool' and also updated drc_pmem_query_health() to take this into account. [ Dan Williams ] v4..v5: * None v3..v4: * Call the DSM_PAPR_SCM_HEALTH service function from papr_scm_service_dsm() instead of papr_scm_ndctl(). [Aneesh] v2..v3: * Updated struct nd_papr_scm_dimm_health_stat_v1 to use '__xx' types as its exported to the userspace [Aneesh] * Changed the constants DSM_PAPR_SCM_DIMM_XX indicating dimm health from enum to #defines [Aneesh] v1..v2: * New patch in the series --- arch/powerpc/include/uapi/asm/papr_pdsm.h | 33 +++++++++++ arch/powerpc/platforms/pseries/papr_scm.c | 70 +++++++++++++++++++++++ 2 files changed, 103 insertions(+)