include/iotrace.h

   1 /*
   2  * Copyright (c) 2014 Google, Inc.
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #ifndef __IOTRACE_H
   8 #define __IOTRACE_H
   9
  10 #include <linux/types.h>
  11
  12 /*
  13  * This file is designed to be included in arch/<arch>/include/asm/io.h.
  14  * It redirects all IO access through a tracing/checksumming feature for
  15  * testing purposes.
  16  */
  17
  18 #if defined(CONFIG_IO_TRACE) && !defined(IOTRACE_IMPL) && \
  19         !defined(CONFIG_SPL_BUILD)
  20
  21 #undef readl
  22 #define readl(addr)     iotrace_readl((const void *)(addr))
  23
  24 #undef writel
  25 #define writel(val, addr)       iotrace_writel(val, (const void *)(addr))
  26
  27 #undef readw
  28 #define readw(addr)     iotrace_readw((const void *)(addr))
  29
  30 #undef writew
  31 #define writew(val, addr)       iotrace_writew(val, (const void *)(addr))
  32
  33 #undef readb
  34 #define readb(addr)     iotrace_readb((const void *)(uintptr_t)addr)
  35
  36 #undef writeb
  37 #define writeb(val, addr) \
  38         iotrace_writeb(val, (const void *)(uintptr_t)addr)
  39
  40 #endif
  41
  42 /* Tracing functions which mirror their io.h counterparts */
  43 u32 iotrace_readl(const void *ptr);
  44 void iotrace_writel(ulong value, const void *ptr);
  45 u16 iotrace_readw(const void *ptr);
  46 void iotrace_writew(ulong value, const void *ptr);
  47 u8 iotrace_readb(const void *ptr);
  48 void iotrace_writeb(ulong value, const void *ptr);
  49
  50 /**
  51  * iotrace_reset_checksum() - Reset the iotrace checksum
  52  */
  53 void iotrace_reset_checksum(void);
  54
  55 /**
  56  * iotrace_get_checksum() - Get the current checksum value
  57  *
  58  * @return currect checksum value
  59  */
  60 u32 iotrace_get_checksum(void);
  61
  62 /**
  63  * iotrace_set_enabled() - Set whether iotracing is enabled or not
  64  *
  65  * This controls whether the checksum is updated and a trace record added
  66  * for each I/O access.
  67  *
  68  * @enable: true to enable iotracing, false to disable
  69  */
  70 void iotrace_set_enabled(int enable);
  71
  72 /**
  73  * iotrace_get_enabled() - Get whether iotracing is enabled or not
  74  *
  75  * @return true if enabled, false if disabled
  76  */
  77 int iotrace_get_enabled(void);
  78
  79 /**
  80  * iotrace_set_buffer() - Set position and size of iotrace buffer
  81  *
  82  * Defines where the iotrace buffer goes, and resets the output pointer to
  83  * the start of the buffer.
  84  *
  85  * The buffer can be 0 size in which case the checksum is updated but no
  86  * trace records are writen. If the buffer is exhausted, the offset will
  87  * continue to increase but not new data will be written.
  88  *
  89  * @start: Start address of buffer
  90  * @size: Size of buffer in bytes
  91  */
  92 void iotrace_set_buffer(ulong start, ulong size);
  93
  94 /**
  95  * iotrace_get_buffer() - Get buffer information
  96  *
  97  * @start: Returns start address of buffer
  98  * @size: Returns size of buffer in bytes
  99  * @offset: Returns the byte offset where the next output trace record will
 100  * @count: Returns the number of trace records recorded
 101  * be written (or would be if the buffer was large enough)
 102  */
 103 void iotrace_get_buffer(ulong *start, ulong *size, ulong *offset, ulong *count);
 104
 105 #endif /* __IOTRACE_H */