1/*
2 * Copyright 2014 IBM Corp.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 */
9
10#include <linux/debugfs.h>
11#include <linux/kernel.h>
12#include <linux/slab.h>
13
14#include "cxl.h"
15
16static struct dentry *cxl_debugfs;
17
18void cxl_stop_trace(struct cxl *adapter)
19{
20	int slice;
21
22	/* Stop the trace */
23	cxl_p1_write(adapter, CXL_PSL_TRACE, 0x8000000000000017LL);
24
25	/* Stop the slice traces */
26	spin_lock(&adapter->afu_list_lock);
27	for (slice = 0; slice < adapter->slices; slice++) {
28		if (adapter->afu[slice])
29			cxl_p1n_write(adapter->afu[slice], CXL_PSL_SLICE_TRACE, 0x8000000000000000LL);
30	}
31	spin_unlock(&adapter->afu_list_lock);
32}
33
34/* Helpers to export CXL mmaped IO registers via debugfs */
35static int debugfs_io_u64_get(void *data, u64 *val)
36{
37	*val = in_be64((u64 __iomem *)data);
38	return 0;
39}
40
41static int debugfs_io_u64_set(void *data, u64 val)
42{
43	out_be64((u64 __iomem *)data, val);
44	return 0;
45}
46DEFINE_SIMPLE_ATTRIBUTE(fops_io_x64, debugfs_io_u64_get, debugfs_io_u64_set, "0x%016llx\n");
47
48static struct dentry *debugfs_create_io_x64(const char *name, umode_t mode,
49					    struct dentry *parent, u64 __iomem *value)
50{
51	return debugfs_create_file(name, mode, parent, (void *)value, &fops_io_x64);
52}
53
54int cxl_debugfs_adapter_add(struct cxl *adapter)
55{
56	struct dentry *dir;
57	char buf[32];
58
59	if (!cxl_debugfs)
60		return -ENODEV;
61
62	snprintf(buf, 32, "card%i", adapter->adapter_num);
63	dir = debugfs_create_dir(buf, cxl_debugfs);
64	if (IS_ERR(dir))
65		return PTR_ERR(dir);
66	adapter->debugfs = dir;
67
68	debugfs_create_io_x64("fir1",     S_IRUSR, dir, _cxl_p1_addr(adapter, CXL_PSL_FIR1));
69	debugfs_create_io_x64("fir2",     S_IRUSR, dir, _cxl_p1_addr(adapter, CXL_PSL_FIR2));
70	debugfs_create_io_x64("fir_cntl", S_IRUSR, dir, _cxl_p1_addr(adapter, CXL_PSL_FIR_CNTL));
71	debugfs_create_io_x64("err_ivte", S_IRUSR, dir, _cxl_p1_addr(adapter, CXL_PSL_ErrIVTE));
72
73	debugfs_create_io_x64("trace", S_IRUSR | S_IWUSR, dir, _cxl_p1_addr(adapter, CXL_PSL_TRACE));
74
75	return 0;
76}
77
78void cxl_debugfs_adapter_remove(struct cxl *adapter)
79{
80	debugfs_remove_recursive(adapter->debugfs);
81}
82
83int cxl_debugfs_afu_add(struct cxl_afu *afu)
84{
85	struct dentry *dir;
86	char buf[32];
87
88	if (!afu->adapter->debugfs)
89		return -ENODEV;
90
91	snprintf(buf, 32, "psl%i.%i", afu->adapter->adapter_num, afu->slice);
92	dir = debugfs_create_dir(buf, afu->adapter->debugfs);
93	if (IS_ERR(dir))
94		return PTR_ERR(dir);
95	afu->debugfs = dir;
96
97	debugfs_create_io_x64("fir",        S_IRUSR, dir, _cxl_p1n_addr(afu, CXL_PSL_FIR_SLICE_An));
98	debugfs_create_io_x64("serr",       S_IRUSR, dir, _cxl_p1n_addr(afu, CXL_PSL_SERR_An));
99	debugfs_create_io_x64("afu_debug",  S_IRUSR, dir, _cxl_p1n_addr(afu, CXL_AFU_DEBUG_An));
100	debugfs_create_io_x64("sr",         S_IRUSR, dir, _cxl_p1n_addr(afu, CXL_PSL_SR_An));
101
102	debugfs_create_io_x64("dsisr",      S_IRUSR, dir, _cxl_p2n_addr(afu, CXL_PSL_DSISR_An));
103	debugfs_create_io_x64("dar",        S_IRUSR, dir, _cxl_p2n_addr(afu, CXL_PSL_DAR_An));
104	debugfs_create_io_x64("sstp0",      S_IRUSR, dir, _cxl_p2n_addr(afu, CXL_SSTP0_An));
105	debugfs_create_io_x64("sstp1",      S_IRUSR, dir, _cxl_p2n_addr(afu, CXL_SSTP1_An));
106	debugfs_create_io_x64("err_status", S_IRUSR, dir, _cxl_p2n_addr(afu, CXL_PSL_ErrStat_An));
107
108	debugfs_create_io_x64("trace", S_IRUSR | S_IWUSR, dir, _cxl_p1n_addr(afu, CXL_PSL_SLICE_TRACE));
109
110	return 0;
111}
112
113void cxl_debugfs_afu_remove(struct cxl_afu *afu)
114{
115	debugfs_remove_recursive(afu->debugfs);
116}
117
118int __init cxl_debugfs_init(void)
119{
120	struct dentry *ent;
121	ent = debugfs_create_dir("cxl", NULL);
122	if (IS_ERR(ent))
123		return PTR_ERR(ent);
124	cxl_debugfs = ent;
125
126	return 0;
127}
128
129void cxl_debugfs_exit(void)
130{
131	debugfs_remove_recursive(cxl_debugfs);
132}
133