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Subject[PATCH v3 17/27] powerpc/powernv/pmem: Implement the Read Error Log command
Date
From: Alastair D'Silva <alastair@d-silva.org>

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>
---
arch/powerpc/platforms/powernv/pmem/ocxl.c | 269 ++++++++++++++++++
.../platforms/powernv/pmem/ocxl_internal.h | 1 +
include/uapi/nvdimm/ocxl-pmem.h | 46 +++
3 files changed, 316 insertions(+)
create mode 100644 include/uapi/nvdimm/ocxl-pmem.h

diff --git a/arch/powerpc/platforms/powernv/pmem/ocxl.c b/arch/powerpc/platforms/powernv/pmem/ocxl.c
index 63109a870d2c..2b64504f9129 100644
--- a/arch/powerpc/platforms/powernv/pmem/ocxl.c
+++ b/arch/powerpc/platforms/powernv/pmem/ocxl.c
@@ -447,10 +447,219 @@ 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 error_log_offset_0x08(struct ocxlpmem *ocxlpmem,
+ u32 *log_identifier, u32 *program_ref_code)
+{
+ int rc;
+ u64 val;
+
+ rc = ocxl_global_mmio_read64(ocxlpmem->ocxl_afu,
+ ocxlpmem->admin_command.data_offset + 0x08,
+ OCXL_LITTLE_ENDIAN, &val);
+ if (rc)
+ return rc;
+
+ *log_identifier = val >> 32;
+ *program_ref_code = val & 0xFFFFFFFF;
+
+ return 0;
+}
+
+static int read_error_log(struct ocxlpmem *ocxlpmem,
+ struct ioctl_ocxl_pmem_error_log *log, bool buf_is_user)
+{
+ u64 val;
+ u16 user_buf_length;
+ u16 buf_length;
+ u16 i;
+ int rc;
+
+ if (log->buf_size % 8)
+ return -EINVAL;
+
+ rc = ocxlpmem_chi(ocxlpmem, &val);
+ if (rc)
+ goto out;
+
+ if (!(val & GLOBAL_MMIO_CHI_ELA))
+ return -EAGAIN;
+
+ user_buf_length = log->buf_size;
+
+ mutex_lock(&ocxlpmem->admin_command.lock);
+
+ rc = admin_command_request(ocxlpmem, ADMIN_COMMAND_ERRLOG);
+ if (rc)
+ goto out;
+
+ rc = admin_command_execute(ocxlpmem);
+ if (rc)
+ goto out;
+
+ rc = admin_command_complete_timeout(ocxlpmem, ADMIN_COMMAND_ERRLOG);
+ if (rc < 0) {
+ dev_warn(&ocxlpmem->dev, "Read error log timed out\n");
+ goto out;
+ }
+
+ rc = admin_response(ocxlpmem);
+ if (rc < 0)
+ goto out;
+ 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 = error_log_offset_0x08(ocxlpmem, &log->log_identifier,
+ &log->program_reference_code);
+ if (rc)
+ goto out;
+
+ 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 == OCXL_PMEM_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_HOST_ENDIAN, &log->wwid[0]);
+ if (rc)
+ goto out;
+
+ rc = ocxl_global_mmio_read64(ocxlpmem->ocxl_afu,
+ ocxlpmem->admin_command.data_offset + 0x28,
+ OCXL_HOST_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 + 0x48; i += 8) {
+ u64 val;
+
+ rc = ocxl_global_mmio_read64(ocxlpmem->ocxl_afu,
+ ocxlpmem->admin_command.data_offset + i,
+ OCXL_HOST_ENDIAN, &val);
+ if (rc)
+ goto out;
+
+ if (buf_is_user) {
+ if (copy_to_user(&log->buf[i], &val, sizeof(u64))) {
+ rc = -EFAULT;
+ goto out;
+ }
+ } else
+ log->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_ocxl_pmem_error_log __user *uarg)
+{
+ struct ioctl_ocxl_pmem_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_OCXL_PMEM_ERROR_LOG:
+ rc = ioctl_error_log(ocxlpmem,
+ (struct ioctl_ocxl_pmem_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,
};

/**
@@ -527,6 +736,60 @@ 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_ocxl_pmem_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 = 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 functions,
@@ -568,6 +831,7 @@ static int probe(struct pci_dev *pdev, const struct pci_device_id *ent)
struct ocxlpmem *ocxlpmem;
int rc;
u16 elapsed, timeout;
+ u64 chi;

if (PCI_FUNC(pdev->devfn) == 0)
return probe_function0(pdev);
@@ -667,6 +931,11 @@ static int probe(struct pci_dev *pdev, const struct pci_device_id *ent)
return 0;

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/arch/powerpc/platforms/powernv/pmem/ocxl_internal.h b/arch/powerpc/platforms/powernv/pmem/ocxl_internal.h
index d2d81fec7bb1..b953ee522ed4 100644
--- a/arch/powerpc/platforms/powernv/pmem/ocxl_internal.h
+++ b/arch/powerpc/platforms/powernv/pmem/ocxl_internal.h
@@ -5,6 +5,7 @@
#include <linux/cdev.h>
#include <misc/ocxl.h>
#include <linux/libnvdimm.h>
+#include <uapi/nvdimm/ocxl-pmem.h>
#include <linux/mm.h>

#define LABEL_AREA_SIZE (1UL << PA_SECTION_SHIFT)
diff --git a/include/uapi/nvdimm/ocxl-pmem.h b/include/uapi/nvdimm/ocxl-pmem.h
new file mode 100644
index 000000000000..b10f8ac0c20f
--- /dev/null
+++ b/include/uapi/nvdimm/ocxl-pmem.h
@@ -0,0 +1,46 @@
+/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
+/* Copyright 2017 IBM Corp. */
+#ifndef _UAPI_OCXL_SCM_H
+#define _UAPI_OCXL_SCM_H
+
+#include <linux/types.h>
+#include <linux/ioctl.h>
+
+#define OCXL_PMEM_ERROR_LOG_ACTION_RESET (1 << (32-32))
+#define OCXL_PMEM_ERROR_LOG_ACTION_CHKFW (1 << (53-32))
+#define OCXL_PMEM_ERROR_LOG_ACTION_REPLACE (1 << (54-32))
+#define OCXL_PMEM_ERROR_LOG_ACTION_DUMP (1 << (55-32))
+
+#define OCXL_PMEM_ERROR_LOG_TYPE_GENERAL (0x00)
+#define OCXL_PMEM_ERROR_LOG_TYPE_PREDICTIVE_FAILURE (0x01)
+#define OCXL_PMEM_ERROR_LOG_TYPE_THERMAL_WARNING (0x02)
+#define OCXL_PMEM_ERROR_LOG_TYPE_DATA_LOSS (0x03)
+#define OCXL_PMEM_ERROR_LOG_TYPE_HEALTH_PERFORMANCE (0x04)
+
+struct ioctl_ocxl_pmem_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 */
+ __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;
+ __u32 reserved2;
+ __u64 reserved3[2];
+ __u8 *buf; /* pointer to output buffer */
+};
+
+/* ioctl numbers */
+#define OCXL_PMEM_MAGIC 0x5C
+/* SCM devices */
+#define IOCTL_OCXL_PMEM_ERROR_LOG _IOWR(OCXL_PMEM_MAGIC, 0x01, struct ioctl_ocxl_pmem_error_log)
+
+#endif /* _UAPI_OCXL_SCM_H */
--
2.24.1
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