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_SIMPLE_ATTRIBUTE(fops_io_x64, debugfs_io_u64_get, debugfs_io_u64_set, "0x%016llx\n");
  47
  48 static 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
  54 int 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
  78 void cxl_debugfs_adapter_remove(struct cxl *adapter)
  79 {
  80         debugfs_remove_recursive(adapter->debugfs);
  81 }
  82
  83 int 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
 113 void cxl_debugfs_afu_remove(struct cxl_afu *afu)
 114 {
 115         debugfs_remove_recursive(afu->debugfs);
 116 }
 117
 118 int __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
 133 void cxl_debugfs_exit(void)
 134 {
 135         debugfs_remove_recursive(cxl_debugfs);
 136 }