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 /* Helpers to export CXL mmaped IO registers via debugfs */
  19 static int debugfs_io_u64_get(void *data, u64 *val)
  20 {
  21         *val = in_be64((u64 __iomem *)data);
  22         return 0;
  23 }
  24
  25 static int debugfs_io_u64_set(void *data, u64 val)
  26 {
  27         out_be64((u64 __iomem *)data, val);
  28         return 0;
  29 }
  30 DEFINE_DEBUGFS_ATTRIBUTE(fops_io_x64, debugfs_io_u64_get, debugfs_io_u64_set,
  31                          "0x%016llx\n");
  32
  33 static struct dentry *debugfs_create_io_x64(const char *name, umode_t mode,
  34                                             struct dentry *parent, u64 __iomem *value)
  35 {
  36         return debugfs_create_file_unsafe(name, mode, parent,
  37                                           (void __force *)value, &fops_io_x64);
  38 }
  39
  40 void cxl_debugfs_add_adapter_regs_psl9(struct cxl *adapter, struct dentry *dir)
  41 {
  42         debugfs_create_io_x64("fir1", S_IRUSR, dir, _cxl_p1_addr(adapter, CXL_PSL9_FIR1));
  43         debugfs_create_io_x64("fir_mask", 0400, dir,
  44                               _cxl_p1_addr(adapter, CXL_PSL9_FIR_MASK));
  45         debugfs_create_io_x64("fir_cntl", S_IRUSR, dir, _cxl_p1_addr(adapter, CXL_PSL9_FIR_CNTL));
  46         debugfs_create_io_x64("trace", S_IRUSR | S_IWUSR, dir, _cxl_p1_addr(adapter, CXL_PSL9_TRACECFG));
  47         debugfs_create_io_x64("debug", 0600, dir,
  48                               _cxl_p1_addr(adapter, CXL_PSL9_DEBUG));
  49         debugfs_create_io_x64("xsl-debug", 0600, dir,
  50                               _cxl_p1_addr(adapter, CXL_XSL9_DBG));
  51 }
  52
  53 void cxl_debugfs_add_adapter_regs_psl8(struct cxl *adapter, struct dentry *dir)
  54 {
  55         debugfs_create_io_x64("fir1", S_IRUSR, dir, _cxl_p1_addr(adapter, CXL_PSL_FIR1));
  56         debugfs_create_io_x64("fir2", S_IRUSR, dir, _cxl_p1_addr(adapter, CXL_PSL_FIR2));
  57         debugfs_create_io_x64("fir_cntl", S_IRUSR, dir, _cxl_p1_addr(adapter, CXL_PSL_FIR_CNTL));
  58         debugfs_create_io_x64("trace", S_IRUSR | S_IWUSR, dir, _cxl_p1_addr(adapter, CXL_PSL_TRACE));
  59 }
  60
  61 int cxl_debugfs_adapter_add(struct cxl *adapter)
  62 {
  63         struct dentry *dir;
  64         char buf[32];
  65
  66         if (!cxl_debugfs)
  67                 return -ENODEV;
  68
  69         snprintf(buf, 32, "card%i", adapter->adapter_num);
  70         dir = debugfs_create_dir(buf, cxl_debugfs);
  71         if (IS_ERR(dir))
  72                 return PTR_ERR(dir);
  73         adapter->debugfs = dir;
  74
  75         debugfs_create_io_x64("err_ivte", S_IRUSR, dir, _cxl_p1_addr(adapter, CXL_PSL_ErrIVTE));
  76
  77         if (adapter->native->sl_ops->debugfs_add_adapter_regs)
  78                 adapter->native->sl_ops->debugfs_add_adapter_regs(adapter, dir);
  79         return 0;
  80 }
  81
  82 void cxl_debugfs_adapter_remove(struct cxl *adapter)
  83 {
  84         debugfs_remove_recursive(adapter->debugfs);
  85 }
  86
  87 void cxl_debugfs_add_afu_regs_psl9(struct cxl_afu *afu, struct dentry *dir)
  88 {
  89         debugfs_create_io_x64("serr", S_IRUSR, dir, _cxl_p1n_addr(afu, CXL_PSL_SERR_An));
  90 }
  91
  92 void cxl_debugfs_add_afu_regs_psl8(struct cxl_afu *afu, struct dentry *dir)
  93 {
  94         debugfs_create_io_x64("sstp0", S_IRUSR, dir, _cxl_p2n_addr(afu, CXL_SSTP0_An));
  95         debugfs_create_io_x64("sstp1", S_IRUSR, dir, _cxl_p2n_addr(afu, CXL_SSTP1_An));
  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
 121         debugfs_create_io_x64("err_status", S_IRUSR, dir, _cxl_p2n_addr(afu, CXL_PSL_ErrStat_An));
 122
 123         if (afu->adapter->native->sl_ops->debugfs_add_afu_regs)
 124                 afu->adapter->native->sl_ops->debugfs_add_afu_regs(afu, dir);
 125
 126         return 0;
 127 }
 128
 129 void cxl_debugfs_afu_remove(struct cxl_afu *afu)
 130 {
 131         debugfs_remove_recursive(afu->debugfs);
 132 }
 133
 134 int __init cxl_debugfs_init(void)
 135 {
 136         struct dentry *ent;
 137
 138         if (!cpu_has_feature(CPU_FTR_HVMODE))
 139                 return 0;
 140
 141         ent = debugfs_create_dir("cxl", NULL);
 142         if (IS_ERR(ent))
 143                 return PTR_ERR(ent);
 144         cxl_debugfs = ent;
 145
 146         return 0;
 147 }
 148
 149 void cxl_debugfs_exit(void)
 150 {
 151         debugfs_remove_recursive(cxl_debugfs);
 152 }