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
16 static struct dentry *cxl_debugfs;
17
cxl_stop_trace(struct cxl * adapter)18 void 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 */
debugfs_io_u64_get(void * data,u64 * val)35 static int debugfs_io_u64_get(void *data, u64 *val)
36 {
37 *val = in_be64((u64 __iomem *)data);
38 return 0;
39 }
40
debugfs_io_u64_set(void * data,u64 val)41 static int debugfs_io_u64_set(void *data, u64 val)
42 {
43 out_be64((u64 __iomem *)data, val);
44 return 0;
45 }
46 DEFINE_SIMPLE_ATTRIBUTE(fops_io_x64, debugfs_io_u64_get, debugfs_io_u64_set, "0x%016llx\n");
47
debugfs_create_io_x64(const char * name,umode_t mode,struct dentry * parent,u64 __iomem * value)48 static 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 __force *)value, &fops_io_x64);
52 }
53
cxl_debugfs_adapter_add(struct cxl * adapter)54 int 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
cxl_debugfs_adapter_remove(struct cxl * adapter)78 void cxl_debugfs_adapter_remove(struct cxl *adapter)
79 {
80 debugfs_remove_recursive(adapter->debugfs);
81 }
82
cxl_debugfs_afu_add(struct cxl_afu * afu)83 int 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
cxl_debugfs_afu_remove(struct cxl_afu * afu)113 void cxl_debugfs_afu_remove(struct cxl_afu *afu)
114 {
115 debugfs_remove_recursive(afu->debugfs);
116 }
117
cxl_debugfs_init(void)118 int __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
cxl_debugfs_exit(void)129 void cxl_debugfs_exit(void)
130 {
131 debugfs_remove_recursive(cxl_debugfs);
132 }
133