DECLARE_GLOBAL_DATA_PTR;
-/* Support up to the machine word length for now */
-typedef ulong iovalue_t;
-
-enum iotrace_flags {
- IOT_8 = 0,
- IOT_16,
- IOT_32,
-
- IOT_READ = 0 << 3,
- IOT_WRITE = 1 << 3,
-};
-
-/**
- * struct iotrace_record - Holds a single I/O trace record
- *
- * @flags: I/O access type
- * @timestamp: Timestamp of access
- * @addr: Address of access
- * @value: Value written or read
- */
-struct iotrace_record {
- enum iotrace_flags flags;
- u64 timestamp;
- phys_addr_t addr;
- iovalue_t value;
-};
-
/**
* struct iotrace - current trace status and checksum
*
* @start: Start address of iotrace buffer
- * @size: Size of iotrace buffer in bytes
+ * @size: Actual size of iotrace buffer in bytes
+ * @needed_size: Needed of iotrace buffer in bytes
* @offset: Current write offset into iotrace buffer
* @region_start: Address of IO region to trace
* @region_size: Size of region to trace. if 0 will trace all address space
static struct iotrace {
ulong start;
ulong size;
+ ulong needed_size;
ulong offset;
ulong region_start;
ulong region_size;
rec = (struct iotrace_record *)map_sysmem(
iotrace.start + iotrace.offset,
sizeof(value));
+ } else {
+ WARN_ONCE(1, "WARNING: iotrace buffer exhausted, please check needed length using \"iotrace stats\"\n");
+ iotrace.needed_size += sizeof(struct iotrace_record);
+ return;
}
+
rec->timestamp = timer_get_us();
rec->flags = flags;
rec->addr = map_to_sysmem(ptr);
iotrace.crc32 = crc32(iotrace.crc32, (unsigned char *)rec,
sizeof(*rec));
+ iotrace.needed_size += sizeof(struct iotrace_record);
iotrace.offset += sizeof(struct iotrace_record);
}
iotrace.crc32 = 0;
}
-void iotrace_get_buffer(ulong *start, ulong *size, ulong *offset, ulong *count)
+void iotrace_get_buffer(ulong *start, ulong *size, ulong *needed_size, ulong *offset, ulong *count)
{
*start = iotrace.start;
*size = iotrace.size;
+ *needed_size = iotrace.needed_size;
*offset = iotrace.offset;
*count = iotrace.offset / sizeof(struct iotrace_record);
}