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 __force *)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
122	if (!cpu_has_feature(CPU_FTR_HVMODE))
123		return 0;
124
125	ent = debugfs_create_dir("cxl", NULL);
126	if (IS_ERR(ent))
127		return PTR_ERR(ent);
128	cxl_debugfs = ent;
129
130	return 0;
131}
132
133void cxl_debugfs_exit(void)
134{
135	debugfs_remove_recursive(cxl_debugfs);
136}