LXR linux/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
  16static struct dentry *cxl_debugfs;
  17
  18void 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 */
  35static int debugfs_io_u64_get(void *data, u64 *val)
  36{
  37        *val = in_be64((u64 __iomem *)data);
  38        return 0;
  39}
  40
  41static int debugfs_io_u64_set(void *data, u64 val)
  42{
  43        out_be64((u64 __iomem *)data, val);
  44        return 0;
  45}
  46DEFINE_SIMPLE_ATTRIBUTE(fops_io_x64, debugfs_io_u64_get, debugfs_io_u64_set, "0x%016llx\n");
  47
  48static 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 *)value, &fops_io_x64);
  52}
  53
  54int 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
  78void cxl_debugfs_adapter_remove(struct cxl *adapter)
  79{
  80        debugfs_remove_recursive(adapter->debugfs);
  81}
  82
  83int 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
 113void cxl_debugfs_afu_remove(struct cxl_afu *afu)
 114{
 115        debugfs_remove_recursive(afu->debugfs);
 116}
 117
 118int __init cxl_debugfs_init(void)
 119{
 120        struct dentry *ent;
 121        ent = debugfs_create_dir("cxl", NULL);
 122        if (IS_ERR(ent))
 123                return PTR_ERR(ent);
 124        cxl_debugfs = ent;
 125
 126        return 0;
 127}
 128
 129void cxl_debugfs_exit(void)
 130{
 131        debugfs_remove_recursive(cxl_debugfs);
 132}
 133