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(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 */
  35 static int debugfs_io_u64_get(void *data, u64 *val)
  36 {
  37         *val = in_be64((u64 __iomem *)data);
  38         return 0;
  39 }
  40
  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_DEBUGFS_ATTRIBUTE(fops_io_x64, debugfs_io_u64_get, debugfs_io_u64_set,
  47                          "0x%016llx\n");
  48
  49 static 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
  56 void 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
  64 void 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
  69 int 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
  90 void cxl_debugfs_adapter_remove(struct cxl *adapter)
  91 {
  92         debugfs_remove_recursive(adapter->debugfs);
  93 }
  94
  95 void 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
 103 int 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
 130 void cxl_debugfs_afu_remove(struct cxl_afu *afu)
 131 {
 132         debugfs_remove_recursive(afu->debugfs);
 133 }
 134
 135 int __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
 150 void cxl_debugfs_exit(void)
 151 {
 152         debugfs_remove_recursive(cxl_debugfs);
 153 }