projects/linux·blob master · refs

138 lines · 3.4 KiB

1// SPDX-License-Identifier: GPL-2.0
2/* 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}