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// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 2021 Intel Corporation. All rights rsvd. */
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/debugfs.h>
#include <linux/io-64-nonatomic-lo-hi.h>
#include <uapi/linux/idxd.h>
#include "idxd.h"
#include "registers.h"
static struct dentry *idxd_debugfs_dir;
static void dump_event_entry(struct idxd_device *idxd, struct seq_file *s,
u16 index, int *count, bool processed)
{
struct idxd_evl *evl = idxd->evl;
struct dsa_evl_entry *entry;
struct dsa_completion_record *cr;
u64 *raw;
int i;
int evl_strides = evl_ent_size(idxd) / sizeof(u64);
entry = (struct dsa_evl_entry *)evl->log + index;
if (!entry->e.desc_valid)
return;
seq_printf(s, "Event Log entry %d (real index %u) processed: %u\n",
*count, index, processed);
seq_printf(s, "desc valid %u wq idx valid %u\n"
"batch %u fault rw %u priv %u error 0x%x\n"
"wq idx %u op %#x pasid %u batch idx %u\n"
"fault addr %#llx\n",
entry->e.desc_valid, entry->e.wq_idx_valid,
entry->e.batch, entry->e.fault_rw, entry->e.priv,
entry->e.error, entry->e.wq_idx, entry->e.operation,
entry->e.pasid, entry->e.batch_idx, entry->e.fault_addr);
cr = &entry->cr;
seq_printf(s, "status %#x result %#x fault_info %#x bytes_completed %u\n"
"fault addr %#llx inv flags %#x\n\n",
cr->status, cr->result, cr->fault_info, cr->bytes_completed,
cr->fault_addr, cr->invalid_flags);
raw = (u64 *)entry;
for (i = 0; i < evl_strides; i++)
seq_printf(s, "entry[%d] = %#llx\n", i, raw[i]);
seq_puts(s, "\n");
*count += 1;
}
static int debugfs_evl_show(struct seq_file *s, void *d)
{
struct idxd_device *idxd = s->private;
struct idxd_evl *evl = idxd->evl;
union evl_status_reg evl_status;
u16 h, t, evl_size, i;
int count = 0;
bool processed = true;
if (!evl || !evl->log)
return 0;
spin_lock(&evl->lock);
evl_status.bits = ioread64(idxd->reg_base + IDXD_EVLSTATUS_OFFSET);
t = evl_status.tail;
h = evl_status.head;
evl_size = evl->size;
seq_printf(s, "Event Log head %u tail %u interrupt pending %u\n\n",
evl_status.head, evl_status.tail, evl_status.int_pending);
i = t;
while (1) {
i = (i + 1) % evl_size;
if (i == t)
break;
if (processed && i == h)
processed = false;
dump_event_entry(idxd, s, i, &count, processed);
}
spin_unlock(&evl->lock);
return 0;
}
DEFINE_SHOW_ATTRIBUTE(debugfs_evl);
int idxd_device_init_debugfs(struct idxd_device *idxd)
{
if (IS_ERR_OR_NULL(idxd_debugfs_dir))
return 0;
idxd->dbgfs_dir = debugfs_create_dir(dev_name(idxd_confdev(idxd)), idxd_debugfs_dir);
if (IS_ERR(idxd->dbgfs_dir))
return PTR_ERR(idxd->dbgfs_dir);
if (idxd->evl) {
idxd->dbgfs_evl_file = debugfs_create_file("event_log", 0400,
idxd->dbgfs_dir, idxd,
&debugfs_evl_fops);
if (IS_ERR(idxd->dbgfs_evl_file)) {
debugfs_remove_recursive(idxd->dbgfs_dir);
idxd->dbgfs_dir = NULL;
return PTR_ERR(idxd->dbgfs_evl_file);
}
}
return 0;
}
void idxd_device_remove_debugfs(struct idxd_device *idxd)
{
debugfs_remove_recursive(idxd->dbgfs_dir);
}
int idxd_init_debugfs(void)
{
if (!debugfs_initialized())
return 0;
idxd_debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, NULL);
if (IS_ERR(idxd_debugfs_dir))
return PTR_ERR(idxd_debugfs_dir);
return 0;
}
void idxd_remove_debugfs(void)
{
debugfs_remove_recursive(idxd_debugfs_dir);
}
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