| Message ID | 20200327071202.2159885-17-alastair@d-silva.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Add support for OpenCAPI Persistent Memory devices | expand |
On Tue, Mar 31, 2020 at 1:59 AM Alastair D'Silva <alastair@d-silva.org> wrote: > > The read error log command extracts information from the controller's > internal error log. > > This patch exposes this information in 2 ways: > - During probe, if an error occurs & a log is available, print it to the > console > - After probe, make the error log available to userspace via an IOCTL. > Userspace is notified of pending error logs in a later patch > ("powerpc/powernv/pmem: Forward events to userspace") So, have a look at the recent papr_scm patches to add health flags and smart data retrieval. I'd prefer to extend existing nvdimm device retrieval mechanisms than invent new ones. > > Signed-off-by: Alastair D'Silva <alastair@d-silva.org> > --- > .../userspace-api/ioctl/ioctl-number.rst | 1 + > drivers/nvdimm/ocxl/main.c | 240 ++++++++++++++++++ > include/uapi/nvdimm/ocxlpmem.h | 46 ++++ > 3 files changed, 287 insertions(+) > create mode 100644 include/uapi/nvdimm/ocxlpmem.h > > diff --git a/Documentation/userspace-api/ioctl/ioctl-number.rst b/Documentation/userspace-api/ioctl/ioctl-number.rst > index 9425377615ce..ba0ce7dca643 100644 > --- a/Documentation/userspace-api/ioctl/ioctl-number.rst > +++ b/Documentation/userspace-api/ioctl/ioctl-number.rst > @@ -340,6 +340,7 @@ Code Seq# Include File Comments > 0xC0 00-0F linux/usb/iowarrior.h > 0xCA 00-0F uapi/misc/cxl.h > 0xCA 10-2F uapi/misc/ocxl.h > +0xCA 30-3F uapi/nvdimm/ocxlpmem.h OpenCAPI Persistent Memory > 0xCA 80-BF uapi/scsi/cxlflash_ioctl.h > 0xCB 00-1F CBM serial IEC bus in development: > <mailto:michael.klein@puffin.lb.shuttle.de> > diff --git a/drivers/nvdimm/ocxl/main.c b/drivers/nvdimm/ocxl/main.c > index 9b85fcd3f1c9..e6be0029f658 100644 > --- a/drivers/nvdimm/ocxl/main.c > +++ b/drivers/nvdimm/ocxl/main.c > @@ -13,6 +13,7 @@ > #include <linux/fs.h> > #include <linux/mm_types.h> > #include <linux/memory_hotplug.h> > +#include <uapi/nvdimm/ocxlpmem.h> > #include "ocxlpmem.h" > > static const struct pci_device_id pci_tbl[] = { > @@ -401,10 +402,190 @@ static int file_release(struct inode *inode, struct file *file) > return 0; > } > > +/** > + * error_log_header_parse() - Parse the first 64 bits of the error log command response > + * @ocxlpmem: the device metadata > + * @length: out, returns the number of bytes in the response (excluding the 64 bit header) > + */ > +static int error_log_header_parse(struct ocxlpmem *ocxlpmem, u16 *length) > +{ > + int rc; > + u64 val; > + u16 data_identifier; > + u32 data_length; > + > + rc = ocxl_global_mmio_read64(ocxlpmem->ocxl_afu, > + ocxlpmem->admin_command.data_offset, > + OCXL_LITTLE_ENDIAN, &val); > + if (rc) > + return rc; > + > + data_identifier = val >> 48; > + data_length = val & 0xFFFF; > + > + if (data_identifier != 0x454C) { // 'EL' > + dev_err(&ocxlpmem->dev, > + "Bad data identifier for error log data, expected 'EL', got '%2s' (%#x), data_length=%u\n", > + (char *)&data_identifier, > + (unsigned int)data_identifier, data_length); > + return -EINVAL; > + } > + > + *length = data_length; > + return 0; > +} > + > +static int read_error_log(struct ocxlpmem *ocxlpmem, > + struct ioctl_ocxlpmem_error_log *log, > + bool buf_is_user) > +{ > + u64 val; > + u16 user_buf_length; > + u16 buf_length; > + u64 *buf = (u64 *)log->buf_ptr; > + u16 i; > + int rc; > + > + if (log->buf_size % 8) > + return -EINVAL; > + > + rc = ocxlpmem_chi(ocxlpmem, &val); > + if (rc) > + return rc; > + > + if (!(val & GLOBAL_MMIO_CHI_ELA)) > + return -EAGAIN; > + > + user_buf_length = log->buf_size; > + > + mutex_lock(&ocxlpmem->admin_command.lock); > + > + rc = admin_command_execute(ocxlpmem, ADMIN_COMMAND_ERRLOG); > + if (rc != STATUS_SUCCESS) { > + warn_status(ocxlpmem, > + "Unexpected status from retrieve error log", rc); > + goto out; > + } > + > + rc = error_log_header_parse(ocxlpmem, &log->buf_size); > + if (rc) > + goto out; > + // log->buf_size now contains the returned buffer size, not the user size > + > + rc = ocxl_global_mmio_read64(ocxlpmem->ocxl_afu, > + ocxlpmem->admin_command.data_offset + 0x08, > + OCXL_LITTLE_ENDIAN, &val); > + if (rc) > + goto out; > + > + log->log_identifier = val >> 32; > + log->program_reference_code = val & 0xFFFFFFFF; > + > + rc = ocxl_global_mmio_read64(ocxlpmem->ocxl_afu, > + ocxlpmem->admin_command.data_offset + 0x10, > + OCXL_LITTLE_ENDIAN, &val); > + if (rc) > + goto out; > + > + log->error_log_type = val >> 56; > + log->action_flags = (log->error_log_type == OCXLPMEM_ERROR_LOG_TYPE_GENERAL) ? > + (val >> 32) & 0xFFFFFF : 0; > + log->power_on_seconds = val & 0xFFFFFFFF; > + > + rc = ocxl_global_mmio_read64(ocxlpmem->ocxl_afu, > + ocxlpmem->admin_command.data_offset + 0x18, > + OCXL_LITTLE_ENDIAN, &log->timestamp); > + if (rc) > + goto out; > + > + rc = ocxl_global_mmio_read64(ocxlpmem->ocxl_afu, > + ocxlpmem->admin_command.data_offset + 0x20, > + OCXL_LITTLE_ENDIAN, &log->wwid[0]); > + if (rc) > + goto out; > + > + rc = ocxl_global_mmio_read64(ocxlpmem->ocxl_afu, > + ocxlpmem->admin_command.data_offset + 0x28, > + OCXL_LITTLE_ENDIAN, &log->wwid[1]); > + if (rc) > + goto out; > + > + rc = ocxl_global_mmio_read64(ocxlpmem->ocxl_afu, > + ocxlpmem->admin_command.data_offset + 0x30, > + OCXL_HOST_ENDIAN, (u64 *)log->fw_revision); > + if (rc) > + goto out; > + log->fw_revision[8] = '\0'; > + > + buf_length = (user_buf_length < log->buf_size) ? > + user_buf_length : log->buf_size; > + for (i = 0; i < buf_length / (sizeof(u64)); i++) { > + rc = ocxl_global_mmio_read64(ocxlpmem->ocxl_afu, > + ocxlpmem->admin_command.data_offset + > + i * sizeof(u64), > + OCXL_HOST_ENDIAN, &val); > + if (rc) > + goto out; > + > + if (buf_is_user) { > + if (copy_to_user((u64 __user *)&buf[i], &val, > + sizeof(u64))) { > + rc = -EFAULT; > + goto out; > + } > + } else { > + buf[i] = val; > + } > + } > + > + rc = admin_response_handled(ocxlpmem); > + if (rc) > + goto out; > + > +out: > + mutex_unlock(&ocxlpmem->admin_command.lock); > + return rc; > +} > + > +static int ioctl_error_log(struct ocxlpmem *ocxlpmem, > + struct ioctl_ocxlpmem_error_log __user *uarg) > +{ > + struct ioctl_ocxlpmem_error_log args; > + int rc; > + > + if (copy_from_user(&args, uarg, sizeof(args))) > + return -EFAULT; > + > + rc = read_error_log(ocxlpmem, &args, true); > + if (rc) > + return rc; > + > + if (copy_to_user(uarg, &args, sizeof(args))) > + return -EFAULT; > + > + return 0; > +} > + > +static long file_ioctl(struct file *file, unsigned int cmd, unsigned long args) > +{ > + struct ocxlpmem *ocxlpmem = file->private_data; > + int rc = -EINVAL; > + > + switch (cmd) { > + case IOCTL_OCXLPMEM_ERROR_LOG: > + rc = ioctl_error_log(ocxlpmem, > + (struct ioctl_ocxlpmem_error_log __user *)args); > + break; > + } > + return rc; > +} > + > static const struct file_operations fops = { > .owner = THIS_MODULE, > .open = file_open, > .release = file_release, > + .unlocked_ioctl = file_ioctl, > + .compat_ioctl = file_ioctl, > }; > > /** > @@ -493,6 +674,60 @@ static int read_device_metadata(struct ocxlpmem *ocxlpmem) > return 0; > } > > +static const char *decode_error_log_type(u8 error_log_type) > +{ > + switch (error_log_type) { > + case 0x00: > + return "general"; > + case 0x01: > + return "predictive failure"; > + case 0x02: > + return "thermal warning"; > + case 0x03: > + return "data loss"; > + case 0x04: > + return "health & performance"; > + default: > + return "unknown"; > + } > +} > + > +static void dump_error_log(struct ocxlpmem *ocxlpmem) > +{ > + struct ioctl_ocxlpmem_error_log log; > + u32 buf_size; > + u8 *buf; > + int rc; > + > + if (ocxlpmem->admin_command.data_size == 0) > + return; > + > + buf_size = ocxlpmem->admin_command.data_size - 0x48; > + buf = kzalloc(buf_size, GFP_KERNEL); > + if (!buf) > + return; > + > + log.buf_ptr = (u64)buf; > + log.buf_size = buf_size; > + > + rc = read_error_log(ocxlpmem, &log, false); > + if (rc < 0) > + goto out; > + > + dev_warn(&ocxlpmem->dev, > + "OCXL PMEM Error log: WWID=0x%016llx%016llx LID=0x%x PRC=%x type=0x%x %s, Uptime=%u seconds timestamp=0x%llx\n", > + log.wwid[0], log.wwid[1], > + log.log_identifier, log.program_reference_code, > + log.error_log_type, > + decode_error_log_type(log.error_log_type), > + log.power_on_seconds, log.timestamp); > + print_hex_dump(KERN_WARNING, "buf", DUMP_PREFIX_OFFSET, 16, 1, buf, > + log.buf_size, false); > + > +out: > + kfree(buf); > +} > + > /** > * probe_function0() - Set up function 0 for an OpenCAPI persistent memory device > * This is important as it enables templates higher than 0 across all other > @@ -656,6 +891,11 @@ static int probe(struct pci_dev *pdev, const struct pci_device_id *ent) > pci_set_drvdata(pdev, NULL); > > err: > + if (ocxlpmem && > + (ocxlpmem_chi(ocxlpmem, &chi) == 0) && > + (chi & GLOBAL_MMIO_CHI_ELA)) > + dump_error_log(ocxlpmem); > + > /* > * Further cleanup is done in the release handler via free_ocxlpmem() > * This allows us to keep the character device live to handle IOCTLs to > diff --git a/include/uapi/nvdimm/ocxlpmem.h b/include/uapi/nvdimm/ocxlpmem.h > new file mode 100644 > index 000000000000..5d3a03ea1e08 > --- /dev/null > +++ b/include/uapi/nvdimm/ocxlpmem.h > @@ -0,0 +1,46 @@ > +/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */ > +/* Copyright 2020 IBM Corp. */ > +#ifndef _UAPI_OCXL_SCM_H > +#define _UAPI_OCXL_SCM_H > + > +#include <linux/types.h> > +#include <linux/ioctl.h> > + > +#define OCXLPMEM_ERROR_LOG_ACTION_RESET (1 << (32 - 32)) > +#define OCXLPMEM_ERROR_LOG_ACTION_CHKFW (1 << (53 - 32)) > +#define OCXLPMEM_ERROR_LOG_ACTION_REPLACE (1 << (54 - 32)) > +#define OCXLPMEM_ERROR_LOG_ACTION_DUMP (1 << (55 - 32)) > + > +#define OCXLPMEM_ERROR_LOG_TYPE_GENERAL (0x00) > +#define OCXLPMEM_ERROR_LOG_TYPE_PREDICTIVE_FAILURE (0x01) > +#define OCXLPMEM_ERROR_LOG_TYPE_THERMAL_WARNING (0x02) > +#define OCXLPMEM_ERROR_LOG_TYPE_DATA_LOSS (0x03) > +#define OCXLPMEM_ERROR_LOG_TYPE_HEALTH_PERFORMANCE (0x04) > + > +struct ioctl_ocxlpmem_error_log { > + __u32 log_identifier; /* out */ > + __u32 program_reference_code; /* out */ > + __u32 action_flags; /* out, recommended course of action */ > + __u32 power_on_seconds; /* out, Number of seconds the controller has been on when the error occurred */ > + __u64 timestamp; /* out, relative time since the current IPL */ > + __u64 wwid[2]; /* out, the NAA formatted WWID associated with the controller */ > + char fw_revision[8 + 1]; /* out, firmware revision as null terminated text */ > + __u8 reserved0[7]; > + __u16 buf_size; /* in/out, buffer size provided/required. > + * If required is greater than provided, the buffer > + * will be truncated to the amount provided. If its > + * less, then only the required bytes will be populated. > + * If it is 0, then there are no more error log entries. > + */ > + __u8 error_log_type; > + __u8 reserved1[5]; > + __u64 buf_ptr; /* coerced pointer to output buffer */ > + __u64 reserved2[2]; > +}; > + > +/* ioctl numbers */ > +#define OCXLPMEM_MAGIC 0xCA > +/* OpenCAPI Persistent memory devices */ > +#define IOCTL_OCXLPMEM_ERROR_LOG _IOWR(OCXLPMEM_MAGIC, 0x30, struct ioctl_ocxlpmem_error_log) > + > +#endif /* _UAPI_OCXL_SCM_H */ > -- > 2.24.1 >
diff --git a/Documentation/userspace-api/ioctl/ioctl-number.rst b/Documentation/userspace-api/ioctl/ioctl-number.rst index 9425377615ce..ba0ce7dca643 100644 --- a/Documentation/userspace-api/ioctl/ioctl-number.rst +++ b/Documentation/userspace-api/ioctl/ioctl-number.rst @@ -340,6 +340,7 @@ Code Seq# Include File Comments 0xC0 00-0F linux/usb/iowarrior.h 0xCA 00-0F uapi/misc/cxl.h 0xCA 10-2F uapi/misc/ocxl.h +0xCA 30-3F uapi/nvdimm/ocxlpmem.h OpenCAPI Persistent Memory 0xCA 80-BF uapi/scsi/cxlflash_ioctl.h 0xCB 00-1F CBM serial IEC bus in development: <mailto:michael.klein@puffin.lb.shuttle.de> diff --git a/drivers/nvdimm/ocxl/main.c b/drivers/nvdimm/ocxl/main.c index 9b85fcd3f1c9..e6be0029f658 100644 --- a/drivers/nvdimm/ocxl/main.c +++ b/drivers/nvdimm/ocxl/main.c @@ -13,6 +13,7 @@ #include <linux/fs.h> #include <linux/mm_types.h> #include <linux/memory_hotplug.h> +#include <uapi/nvdimm/ocxlpmem.h> #include "ocxlpmem.h" static const struct pci_device_id pci_tbl[] = { @@ -401,10 +402,190 @@ static int file_release(struct inode *inode, struct file *file) return 0; } +/** + * error_log_header_parse() - Parse the first 64 bits of the error log command response + * @ocxlpmem: the device metadata + * @length: out, returns the number of bytes in the response (excluding the 64 bit header) + */ +static int error_log_header_parse(struct ocxlpmem *ocxlpmem, u16 *length) +{ + int rc; + u64 val; + u16 data_identifier; + u32 data_length; + + rc = ocxl_global_mmio_read64(ocxlpmem->ocxl_afu, + ocxlpmem->admin_command.data_offset, + OCXL_LITTLE_ENDIAN, &val); + if (rc) + return rc; + + data_identifier = val >> 48; + data_length = val & 0xFFFF; + + if (data_identifier != 0x454C) { // 'EL' + dev_err(&ocxlpmem->dev, + "Bad data identifier for error log data, expected 'EL', got '%2s' (%#x), data_length=%u\n", + (char *)&data_identifier, + (unsigned int)data_identifier, data_length); + return -EINVAL; + } + + *length = data_length; + return 0; +} + +static int read_error_log(struct ocxlpmem *ocxlpmem, + struct ioctl_ocxlpmem_error_log *log, + bool buf_is_user) +{ + u64 val; + u16 user_buf_length; + u16 buf_length; + u64 *buf = (u64 *)log->buf_ptr; + u16 i; + int rc; + + if (log->buf_size % 8) + return -EINVAL; + + rc = ocxlpmem_chi(ocxlpmem, &val); + if (rc) + return rc; + + if (!(val & GLOBAL_MMIO_CHI_ELA)) + return -EAGAIN; + + user_buf_length = log->buf_size; + + mutex_lock(&ocxlpmem->admin_command.lock); + + rc = admin_command_execute(ocxlpmem, ADMIN_COMMAND_ERRLOG); + if (rc != STATUS_SUCCESS) { + warn_status(ocxlpmem, + "Unexpected status from retrieve error log", rc); + goto out; + } + + rc = error_log_header_parse(ocxlpmem, &log->buf_size); + if (rc) + goto out; + // log->buf_size now contains the returned buffer size, not the user size + + rc = ocxl_global_mmio_read64(ocxlpmem->ocxl_afu, + ocxlpmem->admin_command.data_offset + 0x08, + OCXL_LITTLE_ENDIAN, &val); + if (rc) + goto out; + + log->log_identifier = val >> 32; + log->program_reference_code = val & 0xFFFFFFFF; + + rc = ocxl_global_mmio_read64(ocxlpmem->ocxl_afu, + ocxlpmem->admin_command.data_offset + 0x10, + OCXL_LITTLE_ENDIAN, &val); + if (rc) + goto out; + + log->error_log_type = val >> 56; + log->action_flags = (log->error_log_type == OCXLPMEM_ERROR_LOG_TYPE_GENERAL) ? + (val >> 32) & 0xFFFFFF : 0; + log->power_on_seconds = val & 0xFFFFFFFF; + + rc = ocxl_global_mmio_read64(ocxlpmem->ocxl_afu, + ocxlpmem->admin_command.data_offset + 0x18, + OCXL_LITTLE_ENDIAN, &log->timestamp); + if (rc) + goto out; + + rc = ocxl_global_mmio_read64(ocxlpmem->ocxl_afu, + ocxlpmem->admin_command.data_offset + 0x20, + OCXL_LITTLE_ENDIAN, &log->wwid[0]); + if (rc) + goto out; + + rc = ocxl_global_mmio_read64(ocxlpmem->ocxl_afu, + ocxlpmem->admin_command.data_offset + 0x28, + OCXL_LITTLE_ENDIAN, &log->wwid[1]); + if (rc) + goto out; + + rc = ocxl_global_mmio_read64(ocxlpmem->ocxl_afu, + ocxlpmem->admin_command.data_offset + 0x30, + OCXL_HOST_ENDIAN, (u64 *)log->fw_revision); + if (rc) + goto out; + log->fw_revision[8] = '\0'; + + buf_length = (user_buf_length < log->buf_size) ? + user_buf_length : log->buf_size; + for (i = 0; i < buf_length / (sizeof(u64)); i++) { + rc = ocxl_global_mmio_read64(ocxlpmem->ocxl_afu, + ocxlpmem->admin_command.data_offset + + i * sizeof(u64), + OCXL_HOST_ENDIAN, &val); + if (rc) + goto out; + + if (buf_is_user) { + if (copy_to_user((u64 __user *)&buf[i], &val, + sizeof(u64))) { + rc = -EFAULT; + goto out; + } + } else { + buf[i] = val; + } + } + + rc = admin_response_handled(ocxlpmem); + if (rc) + goto out; + +out: + mutex_unlock(&ocxlpmem->admin_command.lock); + return rc; +} + +static int ioctl_error_log(struct ocxlpmem *ocxlpmem, + struct ioctl_ocxlpmem_error_log __user *uarg) +{ + struct ioctl_ocxlpmem_error_log args; + int rc; + + if (copy_from_user(&args, uarg, sizeof(args))) + return -EFAULT; + + rc = read_error_log(ocxlpmem, &args, true); + if (rc) + return rc; + + if (copy_to_user(uarg, &args, sizeof(args))) + return -EFAULT; + + return 0; +} + +static long file_ioctl(struct file *file, unsigned int cmd, unsigned long args) +{ + struct ocxlpmem *ocxlpmem = file->private_data; + int rc = -EINVAL; + + switch (cmd) { + case IOCTL_OCXLPMEM_ERROR_LOG: + rc = ioctl_error_log(ocxlpmem, + (struct ioctl_ocxlpmem_error_log __user *)args); + break; + } + return rc; +} + static const struct file_operations fops = { .owner = THIS_MODULE, .open = file_open, .release = file_release, + .unlocked_ioctl = file_ioctl, + .compat_ioctl = file_ioctl, }; /** @@ -493,6 +674,60 @@ static int read_device_metadata(struct ocxlpmem *ocxlpmem) return 0; } +static const char *decode_error_log_type(u8 error_log_type) +{ + switch (error_log_type) { + case 0x00: + return "general"; + case 0x01: + return "predictive failure"; + case 0x02: + return "thermal warning"; + case 0x03: + return "data loss"; + case 0x04: + return "health & performance"; + default: + return "unknown"; + } +} + +static void dump_error_log(struct ocxlpmem *ocxlpmem) +{ + struct ioctl_ocxlpmem_error_log log; + u32 buf_size; + u8 *buf; + int rc; + + if (ocxlpmem->admin_command.data_size == 0) + return; + + buf_size = ocxlpmem->admin_command.data_size - 0x48; + buf = kzalloc(buf_size, GFP_KERNEL); + if (!buf) + return; + + log.buf_ptr = (u64)buf; + log.buf_size = buf_size; + + rc = read_error_log(ocxlpmem, &log, false); + if (rc < 0) + goto out; + + dev_warn(&ocxlpmem->dev, + "OCXL PMEM Error log: WWID=0x%016llx%016llx LID=0x%x PRC=%x type=0x%x %s, Uptime=%u seconds timestamp=0x%llx\n", + log.wwid[0], log.wwid[1], + log.log_identifier, log.program_reference_code, + log.error_log_type, + decode_error_log_type(log.error_log_type), + log.power_on_seconds, log.timestamp); + print_hex_dump(KERN_WARNING, "buf", DUMP_PREFIX_OFFSET, 16, 1, buf, + log.buf_size, false); + +out: + kfree(buf); +} + /** * probe_function0() - Set up function 0 for an OpenCAPI persistent memory device * This is important as it enables templates higher than 0 across all other @@ -656,6 +891,11 @@ static int probe(struct pci_dev *pdev, const struct pci_device_id *ent) pci_set_drvdata(pdev, NULL); err: + if (ocxlpmem && + (ocxlpmem_chi(ocxlpmem, &chi) == 0) && + (chi & GLOBAL_MMIO_CHI_ELA)) + dump_error_log(ocxlpmem); + /* * Further cleanup is done in the release handler via free_ocxlpmem() * This allows us to keep the character device live to handle IOCTLs to diff --git a/include/uapi/nvdimm/ocxlpmem.h b/include/uapi/nvdimm/ocxlpmem.h new file mode 100644 index 000000000000..5d3a03ea1e08 --- /dev/null +++ b/include/uapi/nvdimm/ocxlpmem.h @@ -0,0 +1,46 @@ +/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */ +/* Copyright 2020 IBM Corp. */ +#ifndef _UAPI_OCXL_SCM_H +#define _UAPI_OCXL_SCM_H + +#include <linux/types.h> +#include <linux/ioctl.h> + +#define OCXLPMEM_ERROR_LOG_ACTION_RESET (1 << (32 - 32)) +#define OCXLPMEM_ERROR_LOG_ACTION_CHKFW (1 << (53 - 32)) +#define OCXLPMEM_ERROR_LOG_ACTION_REPLACE (1 << (54 - 32)) +#define OCXLPMEM_ERROR_LOG_ACTION_DUMP (1 << (55 - 32)) + +#define OCXLPMEM_ERROR_LOG_TYPE_GENERAL (0x00) +#define OCXLPMEM_ERROR_LOG_TYPE_PREDICTIVE_FAILURE (0x01) +#define OCXLPMEM_ERROR_LOG_TYPE_THERMAL_WARNING (0x02) +#define OCXLPMEM_ERROR_LOG_TYPE_DATA_LOSS (0x03) +#define OCXLPMEM_ERROR_LOG_TYPE_HEALTH_PERFORMANCE (0x04) + +struct ioctl_ocxlpmem_error_log { + __u32 log_identifier; /* out */ + __u32 program_reference_code; /* out */ + __u32 action_flags; /* out, recommended course of action */ + __u32 power_on_seconds; /* out, Number of seconds the controller has been on when the error occurred */ + __u64 timestamp; /* out, relative time since the current IPL */ + __u64 wwid[2]; /* out, the NAA formatted WWID associated with the controller */ + char fw_revision[8 + 1]; /* out, firmware revision as null terminated text */ + __u8 reserved0[7]; + __u16 buf_size; /* in/out, buffer size provided/required. + * If required is greater than provided, the buffer + * will be truncated to the amount provided. If its + * less, then only the required bytes will be populated. + * If it is 0, then there are no more error log entries. + */ + __u8 error_log_type; + __u8 reserved1[5]; + __u64 buf_ptr; /* coerced pointer to output buffer */ + __u64 reserved2[2]; +}; + +/* ioctl numbers */ +#define OCXLPMEM_MAGIC 0xCA +/* OpenCAPI Persistent memory devices */ +#define IOCTL_OCXLPMEM_ERROR_LOG _IOWR(OCXLPMEM_MAGIC, 0x30, struct ioctl_ocxlpmem_error_log) + +#endif /* _UAPI_OCXL_SCM_H */
The read error log command extracts information from the controller's internal error log. This patch exposes this information in 2 ways: - During probe, if an error occurs & a log is available, print it to the console - After probe, make the error log available to userspace via an IOCTL. Userspace is notified of pending error logs in a later patch ("powerpc/powernv/pmem: Forward events to userspace") Signed-off-by: Alastair D'Silva <alastair@d-silva.org> --- .../userspace-api/ioctl/ioctl-number.rst | 1 + drivers/nvdimm/ocxl/main.c | 240 ++++++++++++++++++ include/uapi/nvdimm/ocxlpmem.h | 46 ++++ 3 files changed, 287 insertions(+) create mode 100644 include/uapi/nvdimm/ocxlpmem.h