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_DEBUGFS_ATTRIBUTE(fops_io_x64, debugfs_io_u64_get, debugfs_io_u64_set,
 47			 "0x%016llx\n");
 48
 49static struct dentry *debugfs_create_io_x64(const char *name, umode_t mode,
 50					    struct dentry *parent, u64 __iomem *value)
 51{
 52	return debugfs_create_file_unsafe(name, mode, parent,
 53					  (void __force *)value, &fops_io_x64);
 54}
 55
 56void cxl_debugfs_add_adapter_psl_regs(struct cxl *adapter, struct dentry *dir)
 57{
 58	debugfs_create_io_x64("fir1", S_IRUSR, dir, _cxl_p1_addr(adapter, CXL_PSL_FIR1));
 59	debugfs_create_io_x64("fir2", S_IRUSR, dir, _cxl_p1_addr(adapter, CXL_PSL_FIR2));
 60	debugfs_create_io_x64("fir_cntl", S_IRUSR, dir, _cxl_p1_addr(adapter, CXL_PSL_FIR_CNTL));
 61	debugfs_create_io_x64("trace", S_IRUSR | S_IWUSR, dir, _cxl_p1_addr(adapter, CXL_PSL_TRACE));
 62}
 63
 64void cxl_debugfs_add_adapter_xsl_regs(struct cxl *adapter, struct dentry *dir)
 65{
 66	debugfs_create_io_x64("fec", S_IRUSR, dir, _cxl_p1_addr(adapter, CXL_XSL_FEC));
 67}
 68
 69int cxl_debugfs_adapter_add(struct cxl *adapter)
 70{
 71	struct dentry *dir;
 72	char buf[32];
 73
 74	if (!cxl_debugfs)
 75		return -ENODEV;
 76
 77	snprintf(buf, 32, "card%i", adapter->adapter_num);
 78	dir = debugfs_create_dir(buf, cxl_debugfs);
 79	if (IS_ERR(dir))
 80		return PTR_ERR(dir);
 81	adapter->debugfs = dir;
 82
 83	debugfs_create_io_x64("err_ivte", S_IRUSR, dir, _cxl_p1_addr(adapter, CXL_PSL_ErrIVTE));
 84
 85	if (adapter->native->sl_ops->debugfs_add_adapter_sl_regs)
 86		adapter->native->sl_ops->debugfs_add_adapter_sl_regs(adapter, dir);
 87	return 0;
 88}
 89
 90void cxl_debugfs_adapter_remove(struct cxl *adapter)
 91{
 92	debugfs_remove_recursive(adapter->debugfs);
 93}
 94
 95void cxl_debugfs_add_afu_psl_regs(struct cxl_afu *afu, struct dentry *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("trace", S_IRUSR | S_IWUSR, dir, _cxl_p1n_addr(afu, CXL_PSL_SLICE_TRACE));
101}
102
103int cxl_debugfs_afu_add(struct cxl_afu *afu)
104{
105	struct dentry *dir;
106	char buf[32];
107
108	if (!afu->adapter->debugfs)
109		return -ENODEV;
110
111	snprintf(buf, 32, "psl%i.%i", afu->adapter->adapter_num, afu->slice);
112	dir = debugfs_create_dir(buf, afu->adapter->debugfs);
113	if (IS_ERR(dir))
114		return PTR_ERR(dir);
115	afu->debugfs = dir;
116
117	debugfs_create_io_x64("sr",         S_IRUSR, dir, _cxl_p1n_addr(afu, CXL_PSL_SR_An));
118	debugfs_create_io_x64("dsisr",      S_IRUSR, dir, _cxl_p2n_addr(afu, CXL_PSL_DSISR_An));
119	debugfs_create_io_x64("dar",        S_IRUSR, dir, _cxl_p2n_addr(afu, CXL_PSL_DAR_An));
120	debugfs_create_io_x64("sstp0",      S_IRUSR, dir, _cxl_p2n_addr(afu, CXL_SSTP0_An));
121	debugfs_create_io_x64("sstp1",      S_IRUSR, dir, _cxl_p2n_addr(afu, CXL_SSTP1_An));
122	debugfs_create_io_x64("err_status", S_IRUSR, dir, _cxl_p2n_addr(afu, CXL_PSL_ErrStat_An));
123
124	if (afu->adapter->native->sl_ops->debugfs_add_afu_sl_regs)
125		afu->adapter->native->sl_ops->debugfs_add_afu_sl_regs(afu, dir);
126
127	return 0;
128}
129
130void cxl_debugfs_afu_remove(struct cxl_afu *afu)
131{
132	debugfs_remove_recursive(afu->debugfs);
133}
134
135int __init cxl_debugfs_init(void)
136{
137	struct dentry *ent;
138
139	if (!cpu_has_feature(CPU_FTR_HVMODE))
140		return 0;
141
142	ent = debugfs_create_dir("cxl", NULL);
143	if (IS_ERR(ent))
144		return PTR_ERR(ent);
145	cxl_debugfs = ent;
146
147	return 0;
148}
149
150void cxl_debugfs_exit(void)
151{
152	debugfs_remove_recursive(cxl_debugfs);
153}