drivers/misc/cxl/debugfs.c

   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
  18 void cxl_stop_trace_psl9(struct cxl *adapter)
  19 {
  20         /* Stop the trace */
  21         cxl_p1_write(adapter, CXL_PSL9_TRACECFG, 0x4480000000000000ULL);
  22 }
  23
  24 void cxl_stop_trace_psl8(struct cxl *adapter)
  25 {
  26         int slice;
  27
  28         /* Stop the trace */
  29         cxl_p1_write(adapter, CXL_PSL_TRACE, 0x8000000000000017LL);
  30
  31         /* Stop the slice traces */
  32         spin_lock(&adapter->afu_list_lock);
  33         for (slice = 0; slice < adapter->slices; slice++) {
  34                 if (adapter->afu[slice])
  35                         cxl_p1n_write(adapter->afu[slice], CXL_PSL_SLICE_TRACE, 0x8000000000000000LL);
  36         }
  37         spin_unlock(&adapter->afu_list_lock);
  38 }
  39
  40 /* Helpers to export CXL mmaped IO registers via debugfs */
  41 static int debugfs_io_u64_get(void *data, u64 *val)
  42 {
  43         *val = in_be64((u64 __iomem *)data);
  44         return 0;
  45 }
  46
  47 static int debugfs_io_u64_set(void *data, u64 val)
  48 {
  49         out_be64((u64 __iomem *)data, val);
  50         return 0;
  51 }
  52 DEFINE_DEBUGFS_ATTRIBUTE(fops_io_x64, debugfs_io_u64_get, debugfs_io_u64_set,
  53                          "0x%016llx\n");
  54
  55 static struct dentry *debugfs_create_io_x64(const char *name, umode_t mode,
  56                                             struct dentry *parent, u64 __iomem *value)
  57 {
  58         return debugfs_create_file_unsafe(name, mode, parent,
  59                                           (void __force *)value, &fops_io_x64);
  60 }
  61
  62 void cxl_debugfs_add_adapter_regs_psl9(struct cxl *adapter, struct dentry *dir)
  63 {
  64         debugfs_create_io_x64("fir1", S_IRUSR, dir, _cxl_p1_addr(adapter, CXL_PSL9_FIR1));
  65         debugfs_create_io_x64("fir2", S_IRUSR, dir, _cxl_p1_addr(adapter, CXL_PSL9_FIR2));
  66         debugfs_create_io_x64("fir_cntl", S_IRUSR, dir, _cxl_p1_addr(adapter, CXL_PSL9_FIR_CNTL));
  67         debugfs_create_io_x64("trace", S_IRUSR | S_IWUSR, dir, _cxl_p1_addr(adapter, CXL_PSL9_TRACECFG));
  68 }
  69
  70 void cxl_debugfs_add_adapter_regs_psl8(struct cxl *adapter, struct dentry *dir)
  71 {
  72         debugfs_create_io_x64("fir1", S_IRUSR, dir, _cxl_p1_addr(adapter, CXL_PSL_FIR1));
  73         debugfs_create_io_x64("fir2", S_IRUSR, dir, _cxl_p1_addr(adapter, CXL_PSL_FIR2));
  74         debugfs_create_io_x64("fir_cntl", S_IRUSR, dir, _cxl_p1_addr(adapter, CXL_PSL_FIR_CNTL));
  75         debugfs_create_io_x64("trace", S_IRUSR | S_IWUSR, dir, _cxl_p1_addr(adapter, CXL_PSL_TRACE));
  76 }
  77
  78 void cxl_debugfs_add_adapter_regs_xsl(struct cxl *adapter, struct dentry *dir)
  79 {
  80         debugfs_create_io_x64("fec", S_IRUSR, dir, _cxl_p1_addr(adapter, CXL_XSL_FEC));
  81 }
  82
  83 int cxl_debugfs_adapter_add(struct cxl *adapter)
  84 {
  85         struct dentry *dir;
  86         char buf[32];
  87
  88         if (!cxl_debugfs)
  89                 return -ENODEV;
  90
  91         snprintf(buf, 32, "card%i", adapter->adapter_num);
  92         dir = debugfs_create_dir(buf, cxl_debugfs);
  93         if (IS_ERR(dir))
  94                 return PTR_ERR(dir);
  95         adapter->debugfs = dir;
  96
  97         debugfs_create_io_x64("err_ivte", S_IRUSR, dir, _cxl_p1_addr(adapter, CXL_PSL_ErrIVTE));
  98
  99         if (adapter->native->sl_ops->debugfs_add_adapter_regs)
 100                 adapter->native->sl_ops->debugfs_add_adapter_regs(adapter, dir);
 101         return 0;
 102 }
 103
 104 void cxl_debugfs_adapter_remove(struct cxl *adapter)
 105 {
 106         debugfs_remove_recursive(adapter->debugfs);
 107 }
 108
 109 void cxl_debugfs_add_afu_regs_psl9(struct cxl_afu *afu, struct dentry *dir)
 110 {
 111         debugfs_create_io_x64("serr", S_IRUSR, dir, _cxl_p1n_addr(afu, CXL_PSL_SERR_An));
 112 }
 113
 114 void cxl_debugfs_add_afu_regs_psl8(struct cxl_afu *afu, struct dentry *dir)
 115 {
 116         debugfs_create_io_x64("sstp0", S_IRUSR, dir, _cxl_p2n_addr(afu, CXL_SSTP0_An));
 117         debugfs_create_io_x64("sstp1", S_IRUSR, dir, _cxl_p2n_addr(afu, CXL_SSTP1_An));
 118
 119         debugfs_create_io_x64("fir", S_IRUSR, dir, _cxl_p1n_addr(afu, CXL_PSL_FIR_SLICE_An));
 120         debugfs_create_io_x64("serr", S_IRUSR, dir, _cxl_p1n_addr(afu, CXL_PSL_SERR_An));
 121         debugfs_create_io_x64("afu_debug", S_IRUSR, dir, _cxl_p1n_addr(afu, CXL_AFU_DEBUG_An));
 122         debugfs_create_io_x64("trace", S_IRUSR | S_IWUSR, dir, _cxl_p1n_addr(afu, CXL_PSL_SLICE_TRACE));
 123 }
 124
 125 int cxl_debugfs_afu_add(struct cxl_afu *afu)
 126 {
 127         struct dentry *dir;
 128         char buf[32];
 129
 130         if (!afu->adapter->debugfs)
 131                 return -ENODEV;
 132
 133         snprintf(buf, 32, "psl%i.%i", afu->adapter->adapter_num, afu->slice);
 134         dir = debugfs_create_dir(buf, afu->adapter->debugfs);
 135         if (IS_ERR(dir))
 136                 return PTR_ERR(dir);
 137         afu->debugfs = dir;
 138
 139         debugfs_create_io_x64("sr",         S_IRUSR, dir, _cxl_p1n_addr(afu, CXL_PSL_SR_An));
 140         debugfs_create_io_x64("dsisr",      S_IRUSR, dir, _cxl_p2n_addr(afu, CXL_PSL_DSISR_An));
 141         debugfs_create_io_x64("dar",        S_IRUSR, dir, _cxl_p2n_addr(afu, CXL_PSL_DAR_An));
 142
 143         debugfs_create_io_x64("err_status", S_IRUSR, dir, _cxl_p2n_addr(afu, CXL_PSL_ErrStat_An));
 144
 145         if (afu->adapter->native->sl_ops->debugfs_add_afu_regs)
 146                 afu->adapter->native->sl_ops->debugfs_add_afu_regs(afu, dir);
 147
 148         return 0;
 149 }
 150
 151 void cxl_debugfs_afu_remove(struct cxl_afu *afu)
 152 {
 153         debugfs_remove_recursive(afu->debugfs);
 154 }
 155
 156 int __init cxl_debugfs_init(void)
 157 {
 158         struct dentry *ent;
 159
 160         if (!cpu_has_feature(CPU_FTR_HVMODE))
 161                 return 0;
 162
 163         ent = debugfs_create_dir("cxl", NULL);
 164         if (IS_ERR(ent))
 165                 return PTR_ERR(ent);
 166         cxl_debugfs = ent;
 167
 168         return 0;
 169 }
 170
 171 void cxl_debugfs_exit(void)
 172 {
 173         debugfs_remove_recursive(cxl_debugfs);
 174 }