drivers/misc/cxl/debugfs.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright 2014 IBM Corp.
   4  */
   5
   6 #include <linux/debugfs.h>
   7 #include <linux/kernel.h>
   8 #include <linux/slab.h>
   9
  10 #include "cxl.h"
  11
  12 static struct dentry *cxl_debugfs;
  13
  14 /* Helpers to export CXL mmaped IO registers via debugfs */
  15 static int debugfs_io_u64_get(void *data, u64 *val)
  16 {
  17         *val = in_be64((u64 __iomem *)data);
  18         return 0;
  19 }
  20
  21 static int debugfs_io_u64_set(void *data, u64 val)
  22 {
  23         out_be64((u64 __iomem *)data, val);
  24         return 0;
  25 }
  26 DEFINE_DEBUGFS_ATTRIBUTE(fops_io_x64, debugfs_io_u64_get, debugfs_io_u64_set,
  27                          "0x%016llx\n");
  28
  29 static struct dentry *debugfs_create_io_x64(const char *name, umode_t mode,
  30                                             struct dentry *parent, u64 __iomem *value)
  31 {
  32         return debugfs_create_file_unsafe(name, mode, parent,
  33                                           (void __force *)value, &fops_io_x64);
  34 }
  35
  36 void cxl_debugfs_add_adapter_regs_psl9(struct cxl *adapter, struct dentry *dir)
  37 {
  38         debugfs_create_io_x64("fir1", S_IRUSR, dir, _cxl_p1_addr(adapter, CXL_PSL9_FIR1));
  39         debugfs_create_io_x64("fir_mask", 0400, dir,
  40                               _cxl_p1_addr(adapter, CXL_PSL9_FIR_MASK));
  41         debugfs_create_io_x64("fir_cntl", S_IRUSR, dir, _cxl_p1_addr(adapter, CXL_PSL9_FIR_CNTL));
  42         debugfs_create_io_x64("trace", S_IRUSR | S_IWUSR, dir, _cxl_p1_addr(adapter, CXL_PSL9_TRACECFG));
  43         debugfs_create_io_x64("debug", 0600, dir,
  44                               _cxl_p1_addr(adapter, CXL_PSL9_DEBUG));
  45         debugfs_create_io_x64("xsl-debug", 0600, dir,
  46                               _cxl_p1_addr(adapter, CXL_XSL9_DBG));
  47 }
  48
  49 void cxl_debugfs_add_adapter_regs_psl8(struct cxl *adapter, struct dentry *dir)
  50 {
  51         debugfs_create_io_x64("fir1", S_IRUSR, dir, _cxl_p1_addr(adapter, CXL_PSL_FIR1));
  52         debugfs_create_io_x64("fir2", S_IRUSR, dir, _cxl_p1_addr(adapter, CXL_PSL_FIR2));
  53         debugfs_create_io_x64("fir_cntl", S_IRUSR, dir, _cxl_p1_addr(adapter, CXL_PSL_FIR_CNTL));
  54         debugfs_create_io_x64("trace", S_IRUSR | S_IWUSR, dir, _cxl_p1_addr(adapter, CXL_PSL_TRACE));
  55 }
  56
  57 int cxl_debugfs_adapter_add(struct cxl *adapter)
  58 {
  59         struct dentry *dir;
  60         char buf[32];
  61
  62         if (!cxl_debugfs)
  63                 return -ENODEV;
  64
  65         snprintf(buf, 32, "card%i", adapter->adapter_num);
  66         dir = debugfs_create_dir(buf, cxl_debugfs);
  67         if (IS_ERR(dir))
  68                 return PTR_ERR(dir);
  69         adapter->debugfs = dir;
  70
  71         debugfs_create_io_x64("err_ivte", S_IRUSR, dir, _cxl_p1_addr(adapter, CXL_PSL_ErrIVTE));
  72
  73         if (adapter->native->sl_ops->debugfs_add_adapter_regs)
  74                 adapter->native->sl_ops->debugfs_add_adapter_regs(adapter, dir);
  75         return 0;
  76 }
  77
  78 void cxl_debugfs_adapter_remove(struct cxl *adapter)
  79 {
  80         debugfs_remove_recursive(adapter->debugfs);
  81 }
  82
  83 void cxl_debugfs_add_afu_regs_psl9(struct cxl_afu *afu, struct dentry *dir)
  84 {
  85         debugfs_create_io_x64("serr", S_IRUSR, dir, _cxl_p1n_addr(afu, CXL_PSL_SERR_An));
  86 }
  87
  88 void cxl_debugfs_add_afu_regs_psl8(struct cxl_afu *afu, struct dentry *dir)
  89 {
  90         debugfs_create_io_x64("sstp0", S_IRUSR, dir, _cxl_p2n_addr(afu, CXL_SSTP0_An));
  91         debugfs_create_io_x64("sstp1", S_IRUSR, dir, _cxl_p2n_addr(afu, CXL_SSTP1_An));
  92
  93         debugfs_create_io_x64("fir", S_IRUSR, dir, _cxl_p1n_addr(afu, CXL_PSL_FIR_SLICE_An));
  94         debugfs_create_io_x64("serr", S_IRUSR, dir, _cxl_p1n_addr(afu, CXL_PSL_SERR_An));
  95         debugfs_create_io_x64("afu_debug", S_IRUSR, dir, _cxl_p1n_addr(afu, CXL_AFU_DEBUG_An));
  96         debugfs_create_io_x64("trace", S_IRUSR | S_IWUSR, dir, _cxl_p1n_addr(afu, CXL_PSL_SLICE_TRACE));
  97 }
  98
  99 int cxl_debugfs_afu_add(struct cxl_afu *afu)
 100 {
 101         struct dentry *dir;
 102         char buf[32];
 103
 104         if (!afu->adapter->debugfs)
 105                 return -ENODEV;
 106
 107         snprintf(buf, 32, "psl%i.%i", afu->adapter->adapter_num, afu->slice);
 108         dir = debugfs_create_dir(buf, afu->adapter->debugfs);
 109         if (IS_ERR(dir))
 110                 return PTR_ERR(dir);
 111         afu->debugfs = dir;
 112
 113         debugfs_create_io_x64("sr",         S_IRUSR, dir, _cxl_p1n_addr(afu, CXL_PSL_SR_An));
 114         debugfs_create_io_x64("dsisr",      S_IRUSR, dir, _cxl_p2n_addr(afu, CXL_PSL_DSISR_An));
 115         debugfs_create_io_x64("dar",        S_IRUSR, dir, _cxl_p2n_addr(afu, CXL_PSL_DAR_An));
 116
 117         debugfs_create_io_x64("err_status", S_IRUSR, dir, _cxl_p2n_addr(afu, CXL_PSL_ErrStat_An));
 118
 119         if (afu->adapter->native->sl_ops->debugfs_add_afu_regs)
 120                 afu->adapter->native->sl_ops->debugfs_add_afu_regs(afu, dir);
 121
 122         return 0;
 123 }
 124
 125 void cxl_debugfs_afu_remove(struct cxl_afu *afu)
 126 {
 127         debugfs_remove_recursive(afu->debugfs);
 128 }
 129
 130 int __init cxl_debugfs_init(void)
 131 {
 132         struct dentry *ent;
 133
 134         if (!cpu_has_feature(CPU_FTR_HVMODE))
 135                 return 0;
 136
 137         ent = debugfs_create_dir("cxl", NULL);
 138         if (IS_ERR(ent))
 139                 return PTR_ERR(ent);
 140         cxl_debugfs = ent;
 141
 142         return 0;
 143 }
 144
 145 void cxl_debugfs_exit(void)
 146 {
 147         debugfs_remove_recursive(cxl_debugfs);
 148 }