xref: /openbmc/linux/drivers/dma/idxd/debugfs.c (revision 758071a3)
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 
13 static struct dentry *idxd_debugfs_dir;
14 
dump_event_entry(struct idxd_device * idxd,struct seq_file * s,u16 index,int * count,bool processed)15 static 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 
debugfs_evl_show(struct seq_file * s,void * d)57 static 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 
94 DEFINE_SHOW_ATTRIBUTE(debugfs_evl);
95 
idxd_device_init_debugfs(struct idxd_device * idxd)96 int 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 
idxd_device_remove_debugfs(struct idxd_device * idxd)119 void idxd_device_remove_debugfs(struct idxd_device *idxd)
120 {
121 	debugfs_remove_recursive(idxd->dbgfs_dir);
122 }
123 
idxd_init_debugfs(void)124 int 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 
idxd_remove_debugfs(void)135 void idxd_remove_debugfs(void)
136 {
137 	debugfs_remove_recursive(idxd_debugfs_dir);
138 }
139