Subject: Re: [PATCH v11 6/6] powerpc/papr_scm: Implement support for PAPR_PDSM_HEALTH

From: Vaibhav Jain <[email-masked]>
Date: Tue, 09 Jun 2020 00:10:08 +0530

Thanks Ira,

Ira Weiny <[email-masked]> writes:

> On Sun, Jun 07, 2020 at 06:43:39PM +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" <[email-masked]>
>> Cc: Dan Williams <[email-masked]>
>> Cc: Michael Ellerman <[email-masked]>
>> Cc: Ira Weiny <[email-masked]>
>> Signed-off-by: Vaibhav Jain <[email-masked]>
>> ---
>> Changelog:
>> 
>> v10..v11:
>> * Changed the definition of 'struct nd_papr_pdsm_health' to a maximal
>>   struct 184 bytes in size [ Dan Williams ]
>> * Added new field 'extension_flags' to 'struct nd_papr_pdsm_health'
>>   [ Dan Williams ]
>> * Updated papr_pdsm_health() to set field 'extension_flags' to 0.
>> * Introduced a define ND_PDSM_PAYLOAD_MAX_SIZE that indicates the
>>   maximum size of a payload.
>> * Fixed a suspicious conversion from u64 to u8 in papr_pdsm_health
>>   that was preventing correct initialization of 'struct
>>   nd_papr_pdsm_health'. [ Ira ]
>> 
>> 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 | 43 ++++++++++++++
>>  arch/powerpc/platforms/pseries/papr_scm.c | 71 +++++++++++++++++++++++
>>  2 files changed, 114 insertions(+)
>> 
>> diff --git a/arch/powerpc/include/uapi/asm/papr_pdsm.h b/arch/powerpc/include/uapi/asm/papr_pdsm.h
>> index df2447455cfe..12c7aa5ee8bf 100644
>> --- a/arch/powerpc/include/uapi/asm/papr_pdsm.h
>> +++ b/arch/powerpc/include/uapi/asm/papr_pdsm.h
>> @@ -72,13 +72,56 @@ 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_HDR_SIZE \
>> +	(sizeof(struct nd_pdsm_cmd_pkg) - sizeof(struct nd_cmd_pkg))
>> +
>> +/* Max payload size that we can handle */
>> +#define ND_PDSM_PAYLOAD_MAX_SIZE 184
>> +
>>  /*
>>   * 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,
>>  };
>>  
>> +/* 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];
>> +	};
>> +} __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 167fcf0e249d..047ca6bd26a9 100644
>> --- a/arch/powerpc/platforms/pseries/papr_scm.c
>> +++ b/arch/powerpc/platforms/pseries/papr_scm.c
>> @@ -436,6 +436,73 @@ 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_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) {
>> +		.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_encrypted = !!(p->health_bitmap & PAPR_PMEM_ENCRYPTED),
>
> NIT: odd that these are out of order WRT the struct definition.  Just made it
> slightly harder to check them.
Thanks for pointing this out. 2 fields were out of order. I have fixed
them in v12.

>
>> +		.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);
>
> NIT: Now that you have defined the payload size to be fixed at
> ND_PDSM_PAYLOAD_MAX_SIZE do you really need copysize as a variable?
>
Right, but this methods is going to serve as a template for other the
pdsm implementations which may/may-not use a maximal struct like 'struct
nd_papr_pdsm_health' hence want to keep the 'copysize' variable.

> But looks ok otherwise:
>
> Reviewed-by: Ira Weiny <[email-masked]>
Thanks Again. I will addresses your earlier review comment regarding
order of field initialization for 'struct nd_papr_pdsm_health' in v12
and retain this ack.

~ Vaibhav

>
>> +
>> +	/* 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_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.
>>   * Returns errors if any while handling the pdsm command package.
>> @@ -449,6 +516,10 @@ static int 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
>> 

-- 
Cheers
~ Vaibhav