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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright IBM Corp. 2024
*
* Author(s):
* Niklas Schnelle <schnelle@linux.ibm.com>
*
*/
#define KMSG_COMPONENT "zpci"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
#include <linux/kernel.h>
#include <linux/sprintf.h>
#include <linux/pci.h>
#include <asm/sclp.h>
#include <asm/debug.h>
#include <asm/pci_debug.h>
#include "pci_report.h"
#define ZPCI_ERR_LOG_ID_KERNEL_REPORT 0x4714
struct zpci_report_error_data {
u64 timestamp;
u64 err_log_id;
char log_data[];
} __packed;
#define ZPCI_REPORT_SIZE (PAGE_SIZE - sizeof(struct err_notify_sccb))
#define ZPCI_REPORT_DATA_SIZE (ZPCI_REPORT_SIZE - sizeof(struct zpci_report_error_data))
struct zpci_report_error {
struct zpci_report_error_header header;
struct zpci_report_error_data data;
} __packed;
static const char *zpci_state_str(pci_channel_state_t state)
{
switch (state) {
case pci_channel_io_normal:
return "normal";
case pci_channel_io_frozen:
return "frozen";
case pci_channel_io_perm_failure:
return "permanent-failure";
default:
return "invalid";
};
}
static int debug_log_header_fn(debug_info_t *id, struct debug_view *view,
int area, debug_entry_t *entry, char *out_buf,
size_t out_buf_size)
{
unsigned long sec, usec;
unsigned int level;
char *except_str;
int rc = 0;
level = entry->level;
sec = entry->clock;
usec = do_div(sec, USEC_PER_SEC);
if (entry->exception)
except_str = "*";
else
except_str = "-";
rc += scnprintf(out_buf, out_buf_size, "%011ld:%06lu %1u %1s %04u ",
sec, usec, level, except_str,
entry->cpu);
return rc;
}
static int debug_prolog_header(debug_info_t *id, struct debug_view *view,
char *out_buf, size_t out_buf_size)
{
return scnprintf(out_buf, out_buf_size, "sec:usec level except cpu msg\n");
}
static struct debug_view debug_log_view = {
"pci_msg_log",
&debug_prolog_header,
&debug_log_header_fn,
&debug_sprintf_format_fn,
NULL,
NULL
};
/**
* zpci_report_status - Report the status of operations on a PCI device
* @zdev: The PCI device for which to report status
* @operation: A string representing the operation reported
* @status: A string representing the status of the operation
*
* This function creates a human readable report about an operation such as
* PCI device recovery and forwards this to the platform using the SCLP Write
* Event Data mechanism. Besides the operation and status strings the report
* also contains additional information about the device deemed useful for
* debug such as the currently bound device driver, if any, and error state.
* Additionally a string representation of pci_debug_msg_id, or as much as fits,
* is also included.
*
* Return: 0 on success an error code < 0 otherwise.
*/
int zpci_report_status(struct zpci_dev *zdev, const char *operation, const char *status)
{
struct zpci_report_error *report;
struct pci_driver *driver = NULL;
struct pci_dev *pdev = NULL;
char *buf, *end;
int ret;
if (!zdev || !zdev->zbus)
return -ENODEV;
/* Protected virtualization hosts get nothing from us */
if (prot_virt_guest)
return -ENODATA;
report = (void *)get_zeroed_page(GFP_KERNEL);
if (!report)
return -ENOMEM;
if (zdev->zbus->bus)
pdev = pci_get_slot(zdev->zbus->bus, zdev->devfn);
if (pdev)
driver = to_pci_driver(pdev->dev.driver);
buf = report->data.log_data;
end = report->data.log_data + ZPCI_REPORT_DATA_SIZE;
buf += scnprintf(buf, end - buf, "report: %s\n", operation);
buf += scnprintf(buf, end - buf, "status: %s\n", status);
buf += scnprintf(buf, end - buf, "state: %s\n",
(pdev) ? zpci_state_str(pdev->error_state) : "n/a");
buf += scnprintf(buf, end - buf, "driver: %s\n", (driver) ? driver->name : "n/a");
ret = debug_dump(pci_debug_msg_id, &debug_log_view, buf, end - buf, true);
if (ret < 0)
pr_err("Reading PCI debug messages failed with code %d\n", ret);
else
buf += ret;
report->header.version = 1;
report->header.action = SCLP_ERRNOTIFY_AQ_INFO_LOG;
report->header.length = buf - (char *)&report->data;
report->data.timestamp = ktime_get_clocktai_seconds();
report->data.err_log_id = ZPCI_ERR_LOG_ID_KERNEL_REPORT;
ret = sclp_pci_report(&report->header, zdev->fh, zdev->fid);
if (ret)
pr_err("Reporting PCI status failed with code %d\n", ret);
else
pr_info("Reported PCI device status\n");
free_page((unsigned long)report);
return ret;
}
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