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Merge branch 'for-5.8/papr_scm' into libnvdimm-for-next 

Include the papr_scm health retrieval feature for v5.8-rc2. The
functionality was initially posted well in advance of the merge window,
but review comments and a late build-bot warning kept them out of the
v5.8-rc1 libnvdimm pull request.

Vaibhav notes:
These patches are tied to specific features that were committed to
customers in upcoming distros releases (RHEL and SLES) whose time-lines
are tied to 5.8 kernel release.

Being able to track the health of an nvdimm is critical for our
customers that are running workloads leveraging papr-scm nvdimms.
Missing the 5.8 kernel would mean missing the distro timelines and
shifting forward the availability of this feature in distro kernels by
at least 6 months.
This commit is contained in:
Dan Williams 2020-06-19 14:18:51 -07:00
parent 543094e19c d35f18b554
commit 9df24eaef8
6 changed files with 615 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
Documentation/ABI/testing/sysfs-bus-papr-pmem Normal file
View File

@ -0,0 +1,27 @@
What: /sys/bus/nd/devices/nmemX/papr/flags
Date: Apr, 2020
KernelVersion: v5.8
Contact: linuxppc-dev <linuxppc-dev@lists.ozlabs.org>, linux-nvdimm@lists.01.org,
Description:
(RO) Report flags indicating various states of a
papr-pmem NVDIMM device. Each flag maps to a one or
more bits set in the dimm-health-bitmap retrieved in
response to H_SCM_HEALTH hcall. The details of the bit
flags returned in response to this hcall is available
at 'Documentation/powerpc/papr_hcalls.rst' . Below are
the flags reported in this sysfs file:
* "not_armed" : Indicates that NVDIMM contents will not
survive a power cycle.
* "flush_fail" : Indicates that NVDIMM contents
couldn't be flushed during last
shut-down event.
* "restore_fail": Indicates that NVDIMM contents
couldn't be restored during NVDIMM
initialization.
* "encrypted" : NVDIMM contents are encrypted.
* "smart_notify": There is health event for the NVDIMM.
* "scrubbed" : Indicating that contents of the
NVDIMM have been scrubbed.
* "locked" : Indicating that NVDIMM contents cant
be modified until next power cycle.

46
Documentation/powerpc/papr_hcalls.rst
View File

@ -220,13 +220,51 @@ from the LPAR memory.
**H_SCM_HEALTH**
| Input: drcIndex
| Out: *health-bitmap, health-bit-valid-bitmap*
| Out: *health-bitmap (r4), health-bit-valid-bitmap (r5)*
| Return Value: *H_Success, H_Parameter, H_Hardware*
Given a DRC Index return the info on predictive failure and overall health of
the NVDIMM. The asserted bits in the health-bitmap indicate a single predictive
failure and health-bit-valid-bitmap indicate which bits in health-bitmap are
valid.
the PMEM device. The asserted bits in the health-bitmap indicate one or more states
(described in table below) of the PMEM device and health-bit-valid-bitmap indicate
which bits in health-bitmap are valid. The bits are reported in
reverse bit ordering for example a value of 0xC400000000000000
indicates bits 0, 1, and 5 are valid.
Health Bitmap Flags:
+------+-----------------------------------------------------------------------+
| Bit | Definition |
+======+=======================================================================+
| 00 | PMEM device is unable to persist memory contents. |
| | If the system is powered down, nothing will be saved. |
+------+-----------------------------------------------------------------------+
| 01 | PMEM device failed to persist memory contents. Either contents were |
| | not saved successfully on power down or were not restored properly on |
| | power up. |
+------+-----------------------------------------------------------------------+
| 02 | PMEM device contents are persisted from previous IPL. The data from |
| | the last boot were successfully restored. |
+------+-----------------------------------------------------------------------+
| 03 | PMEM device contents are not persisted from previous IPL. There was no|
| | data to restore from the last boot. |
+------+-----------------------------------------------------------------------+
| 04 | PMEM device memory life remaining is critically low |
+------+-----------------------------------------------------------------------+
| 05 | PMEM device will be garded off next IPL due to failure |
+------+-----------------------------------------------------------------------+
| 06 | PMEM device contents cannot persist due to current platform health |
| | status. A hardware failure may prevent data from being saved or |
| | restored. |
+------+-----------------------------------------------------------------------+
| 07 | PMEM device is unable to persist memory contents in certain conditions|
+------+-----------------------------------------------------------------------+
| 08 | PMEM device is encrypted |
+------+-----------------------------------------------------------------------+
| 09 | PMEM device has successfully completed a requested erase or secure |
| | erase procedure. |
+------+-----------------------------------------------------------------------+
|10:63 | Reserved / Unused |
+------+-----------------------------------------------------------------------+
**H_SCM_PERFORMANCE_STATS**

132
arch/powerpc/include/uapi/asm/papr_pdsm.h Normal file
View File

@ -0,0 +1,132 @@
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
* PAPR nvDimm Specific Methods (PDSM) and structs for libndctl
*
* (C) Copyright IBM 2020
*
* Author: Vaibhav Jain <vaibhav at linux.ibm.com>
*/
#ifndef _UAPI_ASM_POWERPC_PAPR_PDSM_H_
#define _UAPI_ASM_POWERPC_PAPR_PDSM_H_
#include <linux/types.h>
#include <linux/ndctl.h>
/*
* PDSM Envelope:
*
* The ioctl ND_CMD_CALL exchange data between user-space and kernel via
* envelope which consists of 2 headers sections and payload sections as
* illustrated below:
* +-----------------+---------------+---------------------------+
* | 64-Bytes | 8-Bytes | Max 184-Bytes |
* +-----------------+---------------+---------------------------+
* | ND-HEADER | PDSM-HEADER | PDSM-PAYLOAD |
* +-----------------+---------------+---------------------------+
* | nd_family | | |
* | nd_size_out | cmd_status | |
* | nd_size_in | reserved | nd_pdsm_payload |
* | nd_command | payload --> | |
* | nd_fw_size | | |
* | nd_payload ---> | | |
* +---------------+-----------------+---------------------------+
*
* ND Header:
* This is the generic libnvdimm header described as 'struct nd_cmd_pkg'
* which is interpreted by libnvdimm before passed on to papr_scm. Important
* member fields used are:
* 'nd_family' : (In) NVDIMM_FAMILY_PAPR_SCM
* 'nd_size_in' : (In) PDSM-HEADER + PDSM-IN-PAYLOAD (usually 0)
* 'nd_size_out' : (In) PDSM-HEADER + PDSM-RETURN-PAYLOAD
* 'nd_command' : (In) One of PAPR_PDSM_XXX
* 'nd_fw_size' : (Out) PDSM-HEADER + size of actual payload returned
*
* PDSM Header:
* This is papr-scm specific header that precedes the payload. This is defined
* as nd_cmd_pdsm_pkg. Following fields aare available in this header:
*
* 'cmd_status' : (Out) Errors if any encountered while servicing PDSM.
* 'reserved' : Not used, reserved for future and should be set to 0.
* 'payload' : A union of all the possible payload structs
*
* PDSM Payload:
*
* The layout of the PDSM Payload is defined by various structs shared between
* papr_scm and libndctl so that contents of payload can be interpreted. As such
* its defined as a union of all possible payload structs as
* 'union nd_pdsm_payload'. Based on the value of 'nd_cmd_pkg.nd_command'
* appropriate member of the union is accessed.
*/
/* Max payload size that we can handle */
#define ND_PDSM_PAYLOAD_MAX_SIZE 184
/* Max payload size that we can handle */
#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;
/*
* PDSM-header + payload expected with ND_CMD_CALL ioctl from libnvdimm
* Valid member of union 'payload' is identified via 'nd_cmd_pkg.nd_command'
* that should always precede this struct when sent to papr_scm via CMD_CALL
* interface.
*/
struct nd_pkg_pdsm {
__s32 cmd_status; /* Out: Sub-cmd status returned back */
__u16 reserved[2]; /* Ignored and to be set as '0' */
union nd_pdsm_payload payload;
} __packed;
#endif /* _UAPI_ASM_POWERPC_PAPR_PDSM_H_ */

418
arch/powerpc/platforms/pseries/papr_scm.c
View File

@ -12,16 +12,57 @@
#include <linux/libnvdimm.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/seq_buf.h>
#include <asm/plpar_wrappers.h>
#include <asm/papr_pdsm.h>
#define BIND_ANY_ADDR (~0ul)
#define PAPR_SCM_DIMM_CMD_MASK \
((1ul << ND_CMD_GET_CONFIG_SIZE) | \
(1ul << ND_CMD_GET_CONFIG_DATA) | \
(1ul << ND_CMD_SET_CONFIG_DATA))
(1ul << ND_CMD_SET_CONFIG_DATA) | \
(1ul << ND_CMD_CALL))
/* DIMM health bitmap bitmap indicators */
/* SCM device is unable to persist memory contents */
#define PAPR_PMEM_UNARMED (1ULL << (63 - 0))
/* SCM device failed to persist memory contents */
#define PAPR_PMEM_SHUTDOWN_DIRTY (1ULL << (63 - 1))
/* SCM device contents are persisted from previous IPL */
#define PAPR_PMEM_SHUTDOWN_CLEAN (1ULL << (63 - 2))
/* SCM device contents are not persisted from previous IPL */
#define PAPR_PMEM_EMPTY (1ULL << (63 - 3))
/* SCM device memory life remaining is critically low */
#define PAPR_PMEM_HEALTH_CRITICAL (1ULL << (63 - 4))
/* SCM device will be garded off next IPL due to failure */
#define PAPR_PMEM_HEALTH_FATAL (1ULL << (63 - 5))
/* SCM contents cannot persist due to current platform health status */
#define PAPR_PMEM_HEALTH_UNHEALTHY (1ULL << (63 - 6))
/* SCM device is unable to persist memory contents in certain conditions */
#define PAPR_PMEM_HEALTH_NON_CRITICAL (1ULL << (63 - 7))
/* SCM device is encrypted */
#define PAPR_PMEM_ENCRYPTED (1ULL << (63 - 8))
/* SCM device has been scrubbed and locked */
#define PAPR_PMEM_SCRUBBED_AND_LOCKED (1ULL << (63 - 9))
/* Bits status indicators for health bitmap indicating unarmed dimm */
#define PAPR_PMEM_UNARMED_MASK (PAPR_PMEM_UNARMED | \
PAPR_PMEM_HEALTH_UNHEALTHY)
/* Bits status indicators for health bitmap indicating unflushed dimm */
#define PAPR_PMEM_BAD_SHUTDOWN_MASK (PAPR_PMEM_SHUTDOWN_DIRTY)
/* Bits status indicators for health bitmap indicating unrestored dimm */
#define PAPR_PMEM_BAD_RESTORE_MASK (PAPR_PMEM_EMPTY)
/* Bit status indicators for smart event notification */
#define PAPR_PMEM_SMART_EVENT_MASK (PAPR_PMEM_HEALTH_CRITICAL | \
PAPR_PMEM_HEALTH_FATAL | \
PAPR_PMEM_HEALTH_UNHEALTHY)
/* private struct associated with each region */
struct papr_scm_priv {
struct platform_device *pdev;
struct device_node *dn;
@ -39,6 +80,15 @@ struct papr_scm_priv {
struct resource res;
struct nd_region *region;
struct nd_interleave_set nd_set;
/* Protect dimm health data from concurrent read/writes */
struct mutex health_mutex;
/* Last time the health information of the dimm was updated */
unsigned long lasthealth_jiffies;
/* Health information for the dimm */
u64 health_bitmap;
};
static int drc_pmem_bind(struct papr_scm_priv *p)
@ -144,6 +194,61 @@ err_out:
return drc_pmem_bind(p);
}
/*
* Issue hcall to retrieve dimm health info and populate papr_scm_priv with the
* health information.
*/
static int __drc_pmem_query_health(struct papr_scm_priv *p)
{
unsigned long ret[PLPAR_HCALL_BUFSIZE];
long rc;
/* issue the hcall */
rc = plpar_hcall(H_SCM_HEALTH, ret, p->drc_index);
if (rc != H_SUCCESS) {
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];
dev_dbg(&p->pdev->dev,
"Queried dimm health info. Bitmap:0x%016lx Mask:0x%016lx\n",
ret[0], ret[1]);
return 0;
}
/* Min interval in seconds for assuming stable dimm health */
#define MIN_HEALTH_QUERY_INTERVAL 60
/* Query cached health info and if needed call drc_pmem_query_health */
static int drc_pmem_query_health(struct papr_scm_priv *p)
{
unsigned long cache_timeout;
int rc;
/* Protect concurrent modifications to papr_scm_priv */
rc = mutex_lock_interruptible(&p->health_mutex);
if (rc)
return rc;
/* Jiffies offset for which the health data is assumed to be same */
cache_timeout = p->lasthealth_jiffies +
msecs_to_jiffies(MIN_HEALTH_QUERY_INTERVAL * 1000);
/* Fetch new health info is its older than MIN_HEALTH_QUERY_INTERVAL */
if (time_after(jiffies, cache_timeout))
rc = __drc_pmem_query_health(p);
else
/* Assume cached health data is valid */
rc = 0;
mutex_unlock(&p->health_mutex);
return rc;
}
static int papr_scm_meta_get(struct papr_scm_priv *p,
struct nd_cmd_get_config_data_hdr *hdr)
@ -246,16 +351,250 @@ static int papr_scm_meta_set(struct papr_scm_priv *p,
return 0;
}
/*
* Do a sanity checks on the inputs args to dimm-control function and return
* '0' if valid. Validation of PDSM payloads happens later in
* papr_scm_service_pdsm.
*/
static int is_cmd_valid(struct nvdimm *nvdimm, unsigned int cmd, void *buf,
unsigned int buf_len)
{
unsigned long cmd_mask = PAPR_SCM_DIMM_CMD_MASK;
struct nd_cmd_pkg *nd_cmd;
struct papr_scm_priv *p;
enum papr_pdsm pdsm;
/* Only dimm-specific calls are supported atm */
if (!nvdimm)
return -EINVAL;
/* get the provider data from struct nvdimm */
p = nvdimm_provider_data(nvdimm);
if (!test_bit(cmd, &cmd_mask)) {
dev_dbg(&p->pdev->dev, "Unsupported cmd=%u\n", cmd);
return -EINVAL;
}
/* For CMD_CALL verify pdsm request */
if (cmd == ND_CMD_CALL) {
/* Verify the envelope and envelop size */
if (!buf ||
buf_len < (sizeof(struct nd_cmd_pkg) + ND_PDSM_HDR_SIZE)) {
dev_dbg(&p->pdev->dev, "Invalid pkg size=%u\n",
buf_len);
return -EINVAL;
}
/* Verify that the nd_cmd_pkg.nd_family is correct */
nd_cmd = (struct nd_cmd_pkg *)buf;
if (nd_cmd->nd_family != NVDIMM_FAMILY_PAPR) {
dev_dbg(&p->pdev->dev, "Invalid pkg family=0x%llx\n",
nd_cmd->nd_family);
return -EINVAL;
}
pdsm = (enum papr_pdsm)nd_cmd->nd_command;
/* Verify if the pdsm command is valid */
if (pdsm <= PAPR_PDSM_MIN || pdsm >= PAPR_PDSM_MAX) {
dev_dbg(&p->pdev->dev, "PDSM[0x%x]: Invalid PDSM\n",
pdsm);
return -EINVAL;
}
/* Have enough space to hold returned 'nd_pkg_pdsm' header */
if (nd_cmd->nd_size_out < ND_PDSM_HDR_SIZE) {
dev_dbg(&p->pdev->dev, "PDSM[0x%x]: Invalid payload\n",
pdsm);
return -EINVAL;
}
}
/* Let the command be further processed */
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
* and pdsm service function.
*
* size_in : Size of input payload if any in the PDSM request.
* size_out : Size of output payload if any in the PDSM request.
* service : Service function for the PDSM request. Return semantics:
* rc < 0 : Error servicing PDSM and rc indicates the error.
* rc >=0 : Serviced successfully and 'rc' indicate number of
* bytes written to payload.
*/
struct pdsm_cmd_desc {
u32 size_in;
u32 size_out;
int (*service)(struct papr_scm_priv *dimm,
union nd_pdsm_payload *payload);
};
/* Holds all supported PDSMs' command descriptors */
static const struct pdsm_cmd_desc __pdsm_cmd_descriptors[] = {
[PAPR_PDSM_MIN] = {
.size_in = 0,
.size_out = 0,
.service = NULL,
},
/* 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,
.size_out = 0,
.service = NULL,
},
};
/* Given a valid pdsm cmd return its command descriptor else return NULL */
static inline const struct pdsm_cmd_desc *pdsm_cmd_desc(enum papr_pdsm cmd)
{
if (cmd >= 0 || cmd < ARRAY_SIZE(__pdsm_cmd_descriptors))
return &__pdsm_cmd_descriptors[cmd];
return NULL;
}
/*
* For a given pdsm request call an appropriate service function.
* Returns errors if any while handling the pdsm command package.
*/
static int papr_scm_service_pdsm(struct papr_scm_priv *p,
struct nd_cmd_pkg *pkg)
{
/* Get the PDSM header and PDSM command */
struct nd_pkg_pdsm *pdsm_pkg = (struct nd_pkg_pdsm *)pkg->nd_payload;
enum papr_pdsm pdsm = (enum papr_pdsm)pkg->nd_command;
const struct pdsm_cmd_desc *pdsc;
int rc;
/* Fetch corresponding pdsm descriptor for validation and servicing */
pdsc = pdsm_cmd_desc(pdsm);
/* Validate pdsm descriptor */
/* Ensure that reserved fields are 0 */
if (pdsm_pkg->reserved[0] || pdsm_pkg->reserved[1]) {
dev_dbg(&p->pdev->dev, "PDSM[0x%x]: Invalid reserved field\n",
pdsm);
return -EINVAL;
}
/* If pdsm expects some input, then ensure that the size_in matches */
if (pdsc->size_in &&
pkg->nd_size_in != (pdsc->size_in + ND_PDSM_HDR_SIZE)) {
dev_dbg(&p->pdev->dev, "PDSM[0x%x]: Mismatched size_in=%d\n",
pdsm, pkg->nd_size_in);
return -EINVAL;
}
/* If pdsm wants to return data, then ensure that size_out matches */
if (pdsc->size_out &&
pkg->nd_size_out != (pdsc->size_out + ND_PDSM_HDR_SIZE)) {
dev_dbg(&p->pdev->dev, "PDSM[0x%x]: Mismatched size_out=%d\n",
pdsm, pkg->nd_size_out);
return -EINVAL;
}
/* Service the pdsm */
if (pdsc->service) {
dev_dbg(&p->pdev->dev, "PDSM[0x%x]: Servicing..\n", pdsm);
rc = pdsc->service(p, &pdsm_pkg->payload);
if (rc < 0) {
/* error encountered while servicing pdsm */
pdsm_pkg->cmd_status = rc;
pkg->nd_fw_size = ND_PDSM_HDR_SIZE;
} else {
/* pdsm serviced and 'rc' bytes written to payload */
pdsm_pkg->cmd_status = 0;
pkg->nd_fw_size = ND_PDSM_HDR_SIZE + rc;
}
} else {
dev_dbg(&p->pdev->dev, "PDSM[0x%x]: Unsupported PDSM request\n",
pdsm);
pdsm_pkg->cmd_status = -ENOENT;
pkg->nd_fw_size = ND_PDSM_HDR_SIZE;
}
return pdsm_pkg->cmd_status;
}
static int papr_scm_ndctl(struct nvdimm_bus_descriptor *nd_desc,
struct nvdimm *nvdimm, unsigned int cmd, void *buf,
unsigned int buf_len, int *cmd_rc)
{
struct nd_cmd_get_config_size *get_size_hdr;
struct nd_cmd_pkg *call_pkg = NULL;
struct papr_scm_priv *p;
int rc;
/* Only dimm-specific calls are supported atm */
if (!nvdimm)
return -EINVAL;
rc = is_cmd_valid(nvdimm, cmd, buf, buf_len);
if (rc) {
pr_debug("Invalid cmd=0x%x. Err=%d\n", cmd, rc);
return rc;
}
/* Use a local variable in case cmd_rc pointer is NULL */
if (!cmd_rc)
cmd_rc = &rc;
p = nvdimm_provider_data(nvdimm);
@ -277,7 +616,13 @@ static int papr_scm_ndctl(struct nvdimm_bus_descriptor *nd_desc,
*cmd_rc = papr_scm_meta_set(p, buf);
break;
case ND_CMD_CALL:
call_pkg = (struct nd_cmd_pkg *)buf;
*cmd_rc = papr_scm_service_pdsm(p, call_pkg);
break;
default:
dev_dbg(&p->pdev->dev, "Unknown command = %d\n", cmd);
return -EINVAL;
}
@ -286,6 +631,64 @@ static int papr_scm_ndctl(struct nvdimm_bus_descriptor *nd_desc,
return 0;
}
static ssize_t flags_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 seq_buf s;
u64 health;
int rc;
rc = drc_pmem_query_health(p);
if (rc)
return rc;
/* Copy health_bitmap locally, check masks & update out buffer */
health = READ_ONCE(p->health_bitmap);
seq_buf_init(&s, buf, PAGE_SIZE);
if (health & PAPR_PMEM_UNARMED_MASK)
seq_buf_printf(&s, "not_armed ");
if (health & PAPR_PMEM_BAD_SHUTDOWN_MASK)
seq_buf_printf(&s, "flush_fail ");
if (health & PAPR_PMEM_BAD_RESTORE_MASK)
seq_buf_printf(&s, "restore_fail ");
if (health & PAPR_PMEM_ENCRYPTED)
seq_buf_printf(&s, "encrypted ");
if (health & PAPR_PMEM_SMART_EVENT_MASK)
seq_buf_printf(&s, "smart_notify ");
if (health & PAPR_PMEM_SCRUBBED_AND_LOCKED)
seq_buf_printf(&s, "scrubbed locked ");
if (seq_buf_used(&s))
seq_buf_printf(&s, "\n");
return seq_buf_used(&s);
}
DEVICE_ATTR_RO(flags);
/* papr_scm specific dimm attributes */
static struct attribute *papr_nd_attributes[] = {
&dev_attr_flags.attr,
NULL,
};
static struct attribute_group papr_nd_attribute_group = {
.name = "papr",
.attrs = papr_nd_attributes,
};
static const struct attribute_group *papr_nd_attr_groups[] = {
&papr_nd_attribute_group,
NULL,
};
static int papr_scm_nvdimm_init(struct papr_scm_priv *p)
{
struct device *dev = &p->pdev->dev;
@ -312,8 +715,8 @@ static int papr_scm_nvdimm_init(struct papr_scm_priv *p)
dimm_flags = 0;
set_bit(NDD_LABELING, &dimm_flags);
p->nvdimm = nvdimm_create(p->bus, p, NULL, dimm_flags,
PAPR_SCM_DIMM_CMD_MASK, 0, NULL);
p->nvdimm = nvdimm_create(p->bus, p, papr_nd_attr_groups,
dimm_flags, PAPR_SCM_DIMM_CMD_MASK, 0, NULL);
if (!p->nvdimm) {
dev_err(dev, "Error creating DIMM object for %pOF\n", p->dn);
goto err;
@ -399,6 +802,9 @@ static int papr_scm_probe(struct platform_device *pdev)
if (!p)
return -ENOMEM;
/* Initialize the dimm mutex */
mutex_init(&p->health_mutex);
/* optional DT properties */
of_property_read_u32(dn, "ibm,metadata-size", &metadata_size);

1
include/uapi/linux/ndctl.h
View File

@ -244,6 +244,7 @@ struct nd_cmd_pkg {
#define NVDIMM_FAMILY_HPE2 2
#define NVDIMM_FAMILY_MSFT 3
#define NVDIMM_FAMILY_HYPERV 4
#define NVDIMM_FAMILY_PAPR 5
#define ND_IOCTL_CALL _IOWR(ND_IOCTL, ND_CMD_CALL,\
struct nd_cmd_pkg)

1
lib/seq_buf.c
View File

@ -91,6 +91,7 @@ int seq_buf_printf(struct seq_buf *s, const char *fmt, ...)
return ret;
}
EXPORT_SYMBOL_GPL(seq_buf_printf);
#ifdef CONFIG_BINARY_PRINTF
/**