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/*
* Intel(R) Processor Trace PMU driver for perf
* Copyright (c) 2013-2014, Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* Intel PT is specified in the Intel Architecture Instruction Set Extensions
* Programming Reference:
* http://software.intel.com/en-us/intel-isa-extensions
*/
#ifndef __INTEL_PT_H__
#define __INTEL_PT_H__
/*
* Single-entry ToPA: when this close to region boundary, switch
* buffers to avoid losing data.
*/
#define TOPA_PMI_MARGIN 512
/*
* Table of Physical Addresses bits
*/
enum topa_sz {
TOPA_4K = 0,
TOPA_8K,
TOPA_16K,
TOPA_32K,
TOPA_64K,
TOPA_128K,
TOPA_256K,
TOPA_512K,
TOPA_1MB,
TOPA_2MB,
TOPA_4MB,
TOPA_8MB,
TOPA_16MB,
TOPA_32MB,
TOPA_64MB,
TOPA_128MB,
TOPA_SZ_END,
};
static inline unsigned int sizes(enum topa_sz tsz)
{
return 1 << (tsz + 12);
};
struct topa_entry {
u64 end : 1;
u64 rsvd0 : 1;
u64 intr : 1;
u64 rsvd1 : 1;
u64 stop : 1;
u64 rsvd2 : 1;
u64 size : 4;
u64 rsvd3 : 2;
u64 base : 36;
u64 rsvd4 : 16;
};
#define TOPA_SHIFT 12
#define PT_CPUID_LEAVES 2
enum pt_capabilities {
PT_CAP_max_subleaf = 0,
PT_CAP_cr3_filtering,
PT_CAP_topa_output,
PT_CAP_topa_multiple_entries,
PT_CAP_payloads_lip,
};
struct pt_pmu {
struct pmu pmu;
u32 caps[4 * PT_CPUID_LEAVES];
};
/**
* struct pt_buffer - buffer configuration; one buffer per task_struct or
* cpu, depending on perf event configuration
* @cpu: cpu for per-cpu allocation
* @tables: list of ToPA tables in this buffer
* @first: shorthand for first topa table
* @last: shorthand for last topa table
* @cur: current topa table
* @nr_pages: buffer size in pages
* @cur_idx: current output region's index within @cur table
* @output_off: offset within the current output region
* @data_size: running total of the amount of data in this buffer
* @lost: if data was lost/truncated
* @head: logical write offset inside the buffer
* @snapshot: if this is for a snapshot/overwrite counter
* @stop_pos: STOP topa entry in the buffer
* @intr_pos: INT topa entry in the buffer
* @data_pages: array of pages from perf
* @topa_index: table of topa entries indexed by page offset
*/
struct pt_buffer {
int cpu;
struct list_head tables;
struct topa *first, *last, *cur;
unsigned int cur_idx;
size_t output_off;
unsigned long nr_pages;
local_t data_size;
local_t lost;
local64_t head;
bool snapshot;
unsigned long stop_pos, intr_pos;
void **data_pages;
struct topa_entry *topa_index[0];
};
/**
* struct pt - per-cpu pt context
* @handle: perf output handle
* @handle_nmi: do handle PT PMI on this cpu, there's an active event
*/
struct pt {
struct perf_output_handle handle;
int handle_nmi;
};
#endif /* __INTEL_PT_H__ */
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