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1// SPDX-License-Identifier: GPL-2.02/* Copyright(c) 2021 Intel Corporation. All rights rsvd. */3#include <linux/init.h>4#include <linux/kernel.h>5#include <linux/module.h>6#include <linux/pci.h>7#include <linux/debugfs.h>8#include <linux/io-64-nonatomic-lo-hi.h>9#include <uapi/linux/idxd.h>10#include "idxd.h"11#include "registers.h"12 13static struct dentry *idxd_debugfs_dir;14 15static void dump_event_entry(struct idxd_device *idxd, struct seq_file *s,16 u16 index, int *count, bool processed)17{18 struct idxd_evl *evl = idxd->evl;19 struct dsa_evl_entry *entry;20 struct dsa_completion_record *cr;21 u64 *raw;22 int i;23 int evl_strides = evl_ent_size(idxd) / sizeof(u64);24 25 entry = (struct dsa_evl_entry *)evl->log + index;26 27 if (!entry->e.desc_valid)28 return;29 30 seq_printf(s, "Event Log entry %d (real index %u) processed: %u\n",31 *count, index, processed);32 33 seq_printf(s, "desc valid %u wq idx valid %u\n"34 "batch %u fault rw %u priv %u error 0x%x\n"35 "wq idx %u op %#x pasid %u batch idx %u\n"36 "fault addr %#llx\n",37 entry->e.desc_valid, entry->e.wq_idx_valid,38 entry->e.batch, entry->e.fault_rw, entry->e.priv,39 entry->e.error, entry->e.wq_idx, entry->e.operation,40 entry->e.pasid, entry->e.batch_idx, entry->e.fault_addr);41 42 cr = &entry->cr;43 seq_printf(s, "status %#x result %#x fault_info %#x bytes_completed %u\n"44 "fault addr %#llx inv flags %#x\n\n",45 cr->status, cr->result, cr->fault_info, cr->bytes_completed,46 cr->fault_addr, cr->invalid_flags);47 48 raw = (u64 *)entry;49 50 for (i = 0; i < evl_strides; i++)51 seq_printf(s, "entry[%d] = %#llx\n", i, raw[i]);52 53 seq_puts(s, "\n");54 *count += 1;55}56 57static int debugfs_evl_show(struct seq_file *s, void *d)58{59 struct idxd_device *idxd = s->private;60 struct idxd_evl *evl = idxd->evl;61 union evl_status_reg evl_status;62 u16 h, t, evl_size, i;63 int count = 0;64 bool processed = true;65 66 if (!evl || !evl->log)67 return 0;68 69 mutex_lock(&evl->lock);70 71 evl_status.bits = ioread64(idxd->reg_base + IDXD_EVLSTATUS_OFFSET);72 t = evl_status.tail;73 h = evl_status.head;74 evl_size = evl->size;75 76 seq_printf(s, "Event Log head %u tail %u interrupt pending %u\n\n",77 evl_status.head, evl_status.tail, evl_status.int_pending);78 79 i = t;80 while (1) {81 i = (i + 1) % evl_size;82 if (i == t)83 break;84 85 if (processed && i == h)86 processed = false;87 dump_event_entry(idxd, s, i, &count, processed);88 }89 90 mutex_unlock(&evl->lock);91 return 0;92}93 94DEFINE_SHOW_ATTRIBUTE(debugfs_evl);95 96int idxd_device_init_debugfs(struct idxd_device *idxd)97{98 if (IS_ERR_OR_NULL(idxd_debugfs_dir))99 return 0;100 101 idxd->dbgfs_dir = debugfs_create_dir(dev_name(idxd_confdev(idxd)), idxd_debugfs_dir);102 if (IS_ERR(idxd->dbgfs_dir))103 return PTR_ERR(idxd->dbgfs_dir);104 105 if (idxd->evl) {106 idxd->dbgfs_evl_file = debugfs_create_file("event_log", 0400,107 idxd->dbgfs_dir, idxd,108 &debugfs_evl_fops);109 if (IS_ERR(idxd->dbgfs_evl_file)) {110 debugfs_remove_recursive(idxd->dbgfs_dir);111 idxd->dbgfs_dir = NULL;112 return PTR_ERR(idxd->dbgfs_evl_file);113 }114 }115 116 return 0;117}118 119void idxd_device_remove_debugfs(struct idxd_device *idxd)120{121 debugfs_remove_recursive(idxd->dbgfs_dir);122}123 124int idxd_init_debugfs(void)125{126 if (!debugfs_initialized())127 return 0;128 129 idxd_debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, NULL);130 if (IS_ERR(idxd_debugfs_dir))131 return PTR_ERR(idxd_debugfs_dir);132 return 0;133}134 135void idxd_remove_debugfs(void)136{137 debugfs_remove_recursive(idxd_debugfs_dir);138}139