common/iotrace.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (c) 2014 Google, Inc.
   4  */
   5
   6 #define IOTRACE_IMPL
   7
   8 #include <common.h>
   9 #include <mapmem.h>
  10 #include <asm/io.h>
  11
  12 DECLARE_GLOBAL_DATA_PTR;
  13
  14 /**
  15  * struct iotrace - current trace status and checksum
  16  *
  17  * @start:      Start address of iotrace buffer
  18  * @size:       Actual size of iotrace buffer in bytes
  19  * @needed_size: Needed of iotrace buffer in bytes
  20  * @offset:     Current write offset into iotrace buffer
  21  * @region_start: Address of IO region to trace
  22  * @region_size: Size of region to trace. if 0 will trace all address space
  23  * @crc32:      Current value of CRC chceksum of trace records
  24  * @enabled:    true if enabled, false if disabled
  25  */
  26 static struct iotrace {
  27         ulong start;
  28         ulong size;
  29         ulong needed_size;
  30         ulong offset;
  31         ulong region_start;
  32         ulong region_size;
  33         u32 crc32;
  34         bool enabled;
  35 } iotrace;
  36
  37 static void add_record(int flags, const void *ptr, ulong value)
  38 {
  39         struct iotrace_record srec, *rec = &srec;
  40
  41         /*
  42          * We don't support iotrace before relocation. Since the trace buffer
  43          * is set up by a command, it can't be enabled at present. To change
  44          * this we would need to set the iotrace buffer at build-time. See
  45          * lib/trace.c for how this might be done if you are interested.
  46          */
  47         if (!(gd->flags & GD_FLG_RELOC) || !iotrace.enabled)
  48                 return;
  49
  50         if (iotrace.region_size)
  51                 if ((ulong)ptr < iotrace.region_start ||
  52                     (ulong)ptr > iotrace.region_start + iotrace.region_size)
  53                         return;
  54
  55         /* Store it if there is room */
  56         if (iotrace.offset + sizeof(*rec) < iotrace.size) {
  57                 rec = (struct iotrace_record *)map_sysmem(
  58                                         iotrace.start + iotrace.offset,
  59                                         sizeof(value));
  60         } else {
  61                 WARN_ONCE(1, "WARNING: iotrace buffer exhausted, please check needed length using \"iotrace stats\"\n");
  62                 iotrace.needed_size += sizeof(struct iotrace_record);
  63                 return;
  64         }
  65
  66         rec->timestamp = timer_get_us();
  67         rec->flags = flags;
  68         rec->addr = map_to_sysmem(ptr);
  69         rec->value = value;
  70
  71         /* Update our checksum */
  72         iotrace.crc32 = crc32(iotrace.crc32, (unsigned char *)rec,
  73                               sizeof(*rec));
  74
  75         iotrace.needed_size += sizeof(struct iotrace_record);
  76         iotrace.offset += sizeof(struct iotrace_record);
  77 }
  78
  79 u32 iotrace_readl(const void *ptr)
  80 {
  81         u32 v;
  82
  83         v = readl(ptr);
  84         add_record(IOT_32 | IOT_READ, ptr, v);
  85
  86         return v;
  87 }
  88
  89 void iotrace_writel(ulong value, const void *ptr)
  90 {
  91         add_record(IOT_32 | IOT_WRITE, ptr, value);
  92         writel(value, ptr);
  93 }
  94
  95 u16 iotrace_readw(const void *ptr)
  96 {
  97         u32 v;
  98
  99         v = readw(ptr);
 100         add_record(IOT_16 | IOT_READ, ptr, v);
 101
 102         return v;
 103 }
 104
 105 void iotrace_writew(ulong value, const void *ptr)
 106 {
 107         add_record(IOT_16 | IOT_WRITE, ptr, value);
 108         writew(value, ptr);
 109 }
 110
 111 u8 iotrace_readb(const void *ptr)
 112 {
 113         u32 v;
 114
 115         v = readb(ptr);
 116         add_record(IOT_8 | IOT_READ, ptr, v);
 117
 118         return v;
 119 }
 120
 121 void iotrace_writeb(ulong value, const void *ptr)
 122 {
 123         add_record(IOT_8 | IOT_WRITE, ptr, value);
 124         writeb(value, ptr);
 125 }
 126
 127 void iotrace_reset_checksum(void)
 128 {
 129         iotrace.crc32 = 0;
 130 }
 131
 132 u32 iotrace_get_checksum(void)
 133 {
 134         return iotrace.crc32;
 135 }
 136
 137 void iotrace_set_region(ulong start, ulong size)
 138 {
 139         iotrace.region_start = start;
 140         iotrace.region_size = size;
 141 }
 142
 143 void iotrace_reset_region(void)
 144 {
 145         iotrace.region_start = 0;
 146         iotrace.region_size = 0;
 147 }
 148
 149 void iotrace_get_region(ulong *start, ulong *size)
 150 {
 151         *start = iotrace.region_start;
 152         *size = iotrace.region_size;
 153 }
 154
 155 void iotrace_set_enabled(int enable)
 156 {
 157         iotrace.enabled = enable;
 158 }
 159
 160 int iotrace_get_enabled(void)
 161 {
 162         return iotrace.enabled;
 163 }
 164
 165 void iotrace_set_buffer(ulong start, ulong size)
 166 {
 167         iotrace.start = start;
 168         iotrace.size = size;
 169         iotrace.offset = 0;
 170         iotrace.crc32 = 0;
 171 }
 172
 173 void iotrace_get_buffer(ulong *start, ulong *size, ulong *needed_size, ulong *offset, ulong *count)
 174 {
 175         *start = iotrace.start;
 176         *size = iotrace.size;
 177         *needed_size = iotrace.needed_size;
 178         *offset = iotrace.offset;
 179         *count = iotrace.offset / sizeof(struct iotrace_record);
 180 }