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3134 lines
87 KiB
3134 lines
87 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright(C) 2015-2018 Linaro Limited. |
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* |
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* Author: Tor Jeremiassen <[email protected]> |
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* Author: Mathieu Poirier <[email protected]> |
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*/ |
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|
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#include <linux/bitops.h> |
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#include <linux/coresight-pmu.h> |
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#include <linux/err.h> |
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#include <linux/kernel.h> |
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#include <linux/log2.h> |
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#include <linux/types.h> |
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#include <linux/zalloc.h> |
|
|
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#include <opencsd/ocsd_if_types.h> |
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#include <stdlib.h> |
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|
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#include "auxtrace.h" |
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#include "color.h" |
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#include "cs-etm.h" |
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#include "cs-etm-decoder/cs-etm-decoder.h" |
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#include "debug.h" |
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#include "dso.h" |
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#include "evlist.h" |
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#include "intlist.h" |
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#include "machine.h" |
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#include "map.h" |
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#include "perf.h" |
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#include "session.h" |
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#include "map_symbol.h" |
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#include "branch.h" |
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#include "symbol.h" |
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#include "tool.h" |
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#include "thread.h" |
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#include "thread-stack.h" |
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#include <tools/libc_compat.h> |
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#include "util/synthetic-events.h" |
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|
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struct cs_etm_auxtrace { |
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struct auxtrace auxtrace; |
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struct auxtrace_queues queues; |
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struct auxtrace_heap heap; |
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struct itrace_synth_opts synth_opts; |
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struct perf_session *session; |
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struct machine *machine; |
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struct thread *unknown_thread; |
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|
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u8 timeless_decoding; |
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u8 snapshot_mode; |
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u8 data_queued; |
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u8 sample_branches; |
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u8 sample_instructions; |
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|
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int num_cpu; |
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u64 latest_kernel_timestamp; |
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u32 auxtrace_type; |
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u64 branches_sample_type; |
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u64 branches_id; |
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u64 instructions_sample_type; |
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u64 instructions_sample_period; |
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u64 instructions_id; |
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u64 **metadata; |
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unsigned int pmu_type; |
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}; |
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|
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struct cs_etm_traceid_queue { |
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u8 trace_chan_id; |
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pid_t pid, tid; |
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u64 period_instructions; |
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size_t last_branch_pos; |
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union perf_event *event_buf; |
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struct thread *thread; |
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struct branch_stack *last_branch; |
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struct branch_stack *last_branch_rb; |
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struct cs_etm_packet *prev_packet; |
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struct cs_etm_packet *packet; |
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struct cs_etm_packet_queue packet_queue; |
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}; |
|
|
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struct cs_etm_queue { |
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struct cs_etm_auxtrace *etm; |
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struct cs_etm_decoder *decoder; |
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struct auxtrace_buffer *buffer; |
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unsigned int queue_nr; |
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u8 pending_timestamp_chan_id; |
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u64 offset; |
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const unsigned char *buf; |
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size_t buf_len, buf_used; |
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/* Conversion between traceID and index in traceid_queues array */ |
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struct intlist *traceid_queues_list; |
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struct cs_etm_traceid_queue **traceid_queues; |
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}; |
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|
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/* RB tree for quick conversion between traceID and metadata pointers */ |
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static struct intlist *traceid_list; |
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|
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static int cs_etm__process_queues(struct cs_etm_auxtrace *etm); |
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static int cs_etm__process_timeless_queues(struct cs_etm_auxtrace *etm, |
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pid_t tid); |
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static int cs_etm__get_data_block(struct cs_etm_queue *etmq); |
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static int cs_etm__decode_data_block(struct cs_etm_queue *etmq); |
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|
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/* PTMs ETMIDR [11:8] set to b0011 */ |
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#define ETMIDR_PTM_VERSION 0x00000300 |
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|
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/* |
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* A struct auxtrace_heap_item only has a queue_nr and a timestamp to |
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* work with. One option is to modify to auxtrace_heap_XYZ() API or simply |
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* encode the etm queue number as the upper 16 bit and the channel as |
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* the lower 16 bit. |
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*/ |
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#define TO_CS_QUEUE_NR(queue_nr, trace_chan_id) \ |
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(queue_nr << 16 | trace_chan_id) |
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#define TO_QUEUE_NR(cs_queue_nr) (cs_queue_nr >> 16) |
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#define TO_TRACE_CHAN_ID(cs_queue_nr) (cs_queue_nr & 0x0000ffff) |
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|
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static u32 cs_etm__get_v7_protocol_version(u32 etmidr) |
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{ |
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etmidr &= ETMIDR_PTM_VERSION; |
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|
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if (etmidr == ETMIDR_PTM_VERSION) |
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return CS_ETM_PROTO_PTM; |
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|
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return CS_ETM_PROTO_ETMV3; |
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} |
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|
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static int cs_etm__get_magic(u8 trace_chan_id, u64 *magic) |
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{ |
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struct int_node *inode; |
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u64 *metadata; |
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|
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inode = intlist__find(traceid_list, trace_chan_id); |
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if (!inode) |
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return -EINVAL; |
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|
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metadata = inode->priv; |
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*magic = metadata[CS_ETM_MAGIC]; |
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return 0; |
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} |
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|
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int cs_etm__get_cpu(u8 trace_chan_id, int *cpu) |
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{ |
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struct int_node *inode; |
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u64 *metadata; |
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|
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inode = intlist__find(traceid_list, trace_chan_id); |
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if (!inode) |
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return -EINVAL; |
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|
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metadata = inode->priv; |
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*cpu = (int)metadata[CS_ETM_CPU]; |
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return 0; |
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} |
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|
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/* |
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* The returned PID format is presented by two bits: |
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* |
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* Bit ETM_OPT_CTXTID: CONTEXTIDR or CONTEXTIDR_EL1 is traced; |
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* Bit ETM_OPT_CTXTID2: CONTEXTIDR_EL2 is traced. |
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* |
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* It's possible that the two bits ETM_OPT_CTXTID and ETM_OPT_CTXTID2 |
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* are enabled at the same time when the session runs on an EL2 kernel. |
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* This means the CONTEXTIDR_EL1 and CONTEXTIDR_EL2 both will be |
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* recorded in the trace data, the tool will selectively use |
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* CONTEXTIDR_EL2 as PID. |
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*/ |
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int cs_etm__get_pid_fmt(u8 trace_chan_id, u64 *pid_fmt) |
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{ |
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struct int_node *inode; |
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u64 *metadata, val; |
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|
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inode = intlist__find(traceid_list, trace_chan_id); |
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if (!inode) |
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return -EINVAL; |
|
|
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metadata = inode->priv; |
|
|
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if (metadata[CS_ETM_MAGIC] == __perf_cs_etmv3_magic) { |
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val = metadata[CS_ETM_ETMCR]; |
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/* CONTEXTIDR is traced */ |
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if (val & BIT(ETM_OPT_CTXTID)) |
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*pid_fmt = BIT(ETM_OPT_CTXTID); |
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} else { |
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val = metadata[CS_ETMV4_TRCCONFIGR]; |
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/* CONTEXTIDR_EL2 is traced */ |
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if (val & (BIT(ETM4_CFG_BIT_VMID) | BIT(ETM4_CFG_BIT_VMID_OPT))) |
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*pid_fmt = BIT(ETM_OPT_CTXTID2); |
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/* CONTEXTIDR_EL1 is traced */ |
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else if (val & BIT(ETM4_CFG_BIT_CTXTID)) |
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*pid_fmt = BIT(ETM_OPT_CTXTID); |
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} |
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|
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return 0; |
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} |
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|
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void cs_etm__etmq_set_traceid_queue_timestamp(struct cs_etm_queue *etmq, |
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u8 trace_chan_id) |
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{ |
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/* |
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* When a timestamp packet is encountered the backend code |
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* is stopped so that the front end has time to process packets |
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* that were accumulated in the traceID queue. Since there can |
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* be more than one channel per cs_etm_queue, we need to specify |
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* what traceID queue needs servicing. |
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*/ |
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etmq->pending_timestamp_chan_id = trace_chan_id; |
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} |
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|
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static u64 cs_etm__etmq_get_timestamp(struct cs_etm_queue *etmq, |
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u8 *trace_chan_id) |
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{ |
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struct cs_etm_packet_queue *packet_queue; |
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|
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if (!etmq->pending_timestamp_chan_id) |
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return 0; |
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|
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if (trace_chan_id) |
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*trace_chan_id = etmq->pending_timestamp_chan_id; |
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|
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packet_queue = cs_etm__etmq_get_packet_queue(etmq, |
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etmq->pending_timestamp_chan_id); |
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if (!packet_queue) |
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return 0; |
|
|
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/* Acknowledge pending status */ |
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etmq->pending_timestamp_chan_id = 0; |
|
|
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/* See function cs_etm_decoder__do_{hard|soft}_timestamp() */ |
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return packet_queue->cs_timestamp; |
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} |
|
|
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static void cs_etm__clear_packet_queue(struct cs_etm_packet_queue *queue) |
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{ |
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int i; |
|
|
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queue->head = 0; |
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queue->tail = 0; |
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queue->packet_count = 0; |
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for (i = 0; i < CS_ETM_PACKET_MAX_BUFFER; i++) { |
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queue->packet_buffer[i].isa = CS_ETM_ISA_UNKNOWN; |
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queue->packet_buffer[i].start_addr = CS_ETM_INVAL_ADDR; |
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queue->packet_buffer[i].end_addr = CS_ETM_INVAL_ADDR; |
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queue->packet_buffer[i].instr_count = 0; |
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queue->packet_buffer[i].last_instr_taken_branch = false; |
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queue->packet_buffer[i].last_instr_size = 0; |
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queue->packet_buffer[i].last_instr_type = 0; |
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queue->packet_buffer[i].last_instr_subtype = 0; |
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queue->packet_buffer[i].last_instr_cond = 0; |
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queue->packet_buffer[i].flags = 0; |
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queue->packet_buffer[i].exception_number = UINT32_MAX; |
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queue->packet_buffer[i].trace_chan_id = UINT8_MAX; |
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queue->packet_buffer[i].cpu = INT_MIN; |
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} |
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} |
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|
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static void cs_etm__clear_all_packet_queues(struct cs_etm_queue *etmq) |
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{ |
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int idx; |
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struct int_node *inode; |
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struct cs_etm_traceid_queue *tidq; |
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struct intlist *traceid_queues_list = etmq->traceid_queues_list; |
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|
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intlist__for_each_entry(inode, traceid_queues_list) { |
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idx = (int)(intptr_t)inode->priv; |
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tidq = etmq->traceid_queues[idx]; |
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cs_etm__clear_packet_queue(&tidq->packet_queue); |
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} |
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} |
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|
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static int cs_etm__init_traceid_queue(struct cs_etm_queue *etmq, |
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struct cs_etm_traceid_queue *tidq, |
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u8 trace_chan_id) |
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{ |
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int rc = -ENOMEM; |
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struct auxtrace_queue *queue; |
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struct cs_etm_auxtrace *etm = etmq->etm; |
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|
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cs_etm__clear_packet_queue(&tidq->packet_queue); |
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|
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queue = &etmq->etm->queues.queue_array[etmq->queue_nr]; |
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tidq->tid = queue->tid; |
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tidq->pid = -1; |
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tidq->trace_chan_id = trace_chan_id; |
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|
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tidq->packet = zalloc(sizeof(struct cs_etm_packet)); |
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if (!tidq->packet) |
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goto out; |
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|
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tidq->prev_packet = zalloc(sizeof(struct cs_etm_packet)); |
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if (!tidq->prev_packet) |
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goto out_free; |
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|
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if (etm->synth_opts.last_branch) { |
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size_t sz = sizeof(struct branch_stack); |
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|
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sz += etm->synth_opts.last_branch_sz * |
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sizeof(struct branch_entry); |
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tidq->last_branch = zalloc(sz); |
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if (!tidq->last_branch) |
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goto out_free; |
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tidq->last_branch_rb = zalloc(sz); |
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if (!tidq->last_branch_rb) |
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goto out_free; |
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} |
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|
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tidq->event_buf = malloc(PERF_SAMPLE_MAX_SIZE); |
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if (!tidq->event_buf) |
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goto out_free; |
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|
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return 0; |
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|
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out_free: |
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zfree(&tidq->last_branch_rb); |
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zfree(&tidq->last_branch); |
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zfree(&tidq->prev_packet); |
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zfree(&tidq->packet); |
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out: |
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return rc; |
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} |
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|
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static struct cs_etm_traceid_queue |
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*cs_etm__etmq_get_traceid_queue(struct cs_etm_queue *etmq, u8 trace_chan_id) |
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{ |
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int idx; |
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struct int_node *inode; |
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struct intlist *traceid_queues_list; |
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struct cs_etm_traceid_queue *tidq, **traceid_queues; |
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struct cs_etm_auxtrace *etm = etmq->etm; |
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|
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if (etm->timeless_decoding) |
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trace_chan_id = CS_ETM_PER_THREAD_TRACEID; |
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|
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traceid_queues_list = etmq->traceid_queues_list; |
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|
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/* |
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* Check if the traceid_queue exist for this traceID by looking |
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* in the queue list. |
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*/ |
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inode = intlist__find(traceid_queues_list, trace_chan_id); |
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if (inode) { |
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idx = (int)(intptr_t)inode->priv; |
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return etmq->traceid_queues[idx]; |
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} |
|
|
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/* We couldn't find a traceid_queue for this traceID, allocate one */ |
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tidq = malloc(sizeof(*tidq)); |
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if (!tidq) |
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return NULL; |
|
|
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memset(tidq, 0, sizeof(*tidq)); |
|
|
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/* Get a valid index for the new traceid_queue */ |
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idx = intlist__nr_entries(traceid_queues_list); |
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/* Memory for the inode is free'ed in cs_etm_free_traceid_queues () */ |
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inode = intlist__findnew(traceid_queues_list, trace_chan_id); |
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if (!inode) |
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goto out_free; |
|
|
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/* Associate this traceID with this index */ |
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inode->priv = (void *)(intptr_t)idx; |
|
|
|
if (cs_etm__init_traceid_queue(etmq, tidq, trace_chan_id)) |
|
goto out_free; |
|
|
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/* Grow the traceid_queues array by one unit */ |
|
traceid_queues = etmq->traceid_queues; |
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traceid_queues = reallocarray(traceid_queues, |
|
idx + 1, |
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sizeof(*traceid_queues)); |
|
|
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/* |
|
* On failure reallocarray() returns NULL and the original block of |
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* memory is left untouched. |
|
*/ |
|
if (!traceid_queues) |
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goto out_free; |
|
|
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traceid_queues[idx] = tidq; |
|
etmq->traceid_queues = traceid_queues; |
|
|
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return etmq->traceid_queues[idx]; |
|
|
|
out_free: |
|
/* |
|
* Function intlist__remove() removes the inode from the list |
|
* and delete the memory associated to it. |
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*/ |
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intlist__remove(traceid_queues_list, inode); |
|
free(tidq); |
|
|
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return NULL; |
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} |
|
|
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struct cs_etm_packet_queue |
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*cs_etm__etmq_get_packet_queue(struct cs_etm_queue *etmq, u8 trace_chan_id) |
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{ |
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struct cs_etm_traceid_queue *tidq; |
|
|
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tidq = cs_etm__etmq_get_traceid_queue(etmq, trace_chan_id); |
|
if (tidq) |
|
return &tidq->packet_queue; |
|
|
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return NULL; |
|
} |
|
|
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static void cs_etm__packet_swap(struct cs_etm_auxtrace *etm, |
|
struct cs_etm_traceid_queue *tidq) |
|
{ |
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struct cs_etm_packet *tmp; |
|
|
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if (etm->sample_branches || etm->synth_opts.last_branch || |
|
etm->sample_instructions) { |
|
/* |
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* Swap PACKET with PREV_PACKET: PACKET becomes PREV_PACKET for |
|
* the next incoming packet. |
|
*/ |
|
tmp = tidq->packet; |
|
tidq->packet = tidq->prev_packet; |
|
tidq->prev_packet = tmp; |
|
} |
|
} |
|
|
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static void cs_etm__packet_dump(const char *pkt_string) |
|
{ |
|
const char *color = PERF_COLOR_BLUE; |
|
int len = strlen(pkt_string); |
|
|
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if (len && (pkt_string[len-1] == '\n')) |
|
color_fprintf(stdout, color, " %s", pkt_string); |
|
else |
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color_fprintf(stdout, color, " %s\n", pkt_string); |
|
|
|
fflush(stdout); |
|
} |
|
|
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static void cs_etm__set_trace_param_etmv3(struct cs_etm_trace_params *t_params, |
|
struct cs_etm_auxtrace *etm, int idx, |
|
u32 etmidr) |
|
{ |
|
u64 **metadata = etm->metadata; |
|
|
|
t_params[idx].protocol = cs_etm__get_v7_protocol_version(etmidr); |
|
t_params[idx].etmv3.reg_ctrl = metadata[idx][CS_ETM_ETMCR]; |
|
t_params[idx].etmv3.reg_trc_id = metadata[idx][CS_ETM_ETMTRACEIDR]; |
|
} |
|
|
|
static void cs_etm__set_trace_param_etmv4(struct cs_etm_trace_params *t_params, |
|
struct cs_etm_auxtrace *etm, int idx) |
|
{ |
|
u64 **metadata = etm->metadata; |
|
|
|
t_params[idx].protocol = CS_ETM_PROTO_ETMV4i; |
|
t_params[idx].etmv4.reg_idr0 = metadata[idx][CS_ETMV4_TRCIDR0]; |
|
t_params[idx].etmv4.reg_idr1 = metadata[idx][CS_ETMV4_TRCIDR1]; |
|
t_params[idx].etmv4.reg_idr2 = metadata[idx][CS_ETMV4_TRCIDR2]; |
|
t_params[idx].etmv4.reg_idr8 = metadata[idx][CS_ETMV4_TRCIDR8]; |
|
t_params[idx].etmv4.reg_configr = metadata[idx][CS_ETMV4_TRCCONFIGR]; |
|
t_params[idx].etmv4.reg_traceidr = metadata[idx][CS_ETMV4_TRCTRACEIDR]; |
|
} |
|
|
|
static void cs_etm__set_trace_param_ete(struct cs_etm_trace_params *t_params, |
|
struct cs_etm_auxtrace *etm, int idx) |
|
{ |
|
u64 **metadata = etm->metadata; |
|
|
|
t_params[idx].protocol = CS_ETM_PROTO_ETE; |
|
t_params[idx].ete.reg_idr0 = metadata[idx][CS_ETMV4_TRCIDR0]; |
|
t_params[idx].ete.reg_idr1 = metadata[idx][CS_ETMV4_TRCIDR1]; |
|
t_params[idx].ete.reg_idr2 = metadata[idx][CS_ETMV4_TRCIDR2]; |
|
t_params[idx].ete.reg_idr8 = metadata[idx][CS_ETMV4_TRCIDR8]; |
|
t_params[idx].ete.reg_configr = metadata[idx][CS_ETMV4_TRCCONFIGR]; |
|
t_params[idx].ete.reg_traceidr = metadata[idx][CS_ETMV4_TRCTRACEIDR]; |
|
t_params[idx].ete.reg_devarch = metadata[idx][CS_ETE_TRCDEVARCH]; |
|
} |
|
|
|
static int cs_etm__init_trace_params(struct cs_etm_trace_params *t_params, |
|
struct cs_etm_auxtrace *etm, |
|
int decoders) |
|
{ |
|
int i; |
|
u32 etmidr; |
|
u64 architecture; |
|
|
|
for (i = 0; i < decoders; i++) { |
|
architecture = etm->metadata[i][CS_ETM_MAGIC]; |
|
|
|
switch (architecture) { |
|
case __perf_cs_etmv3_magic: |
|
etmidr = etm->metadata[i][CS_ETM_ETMIDR]; |
|
cs_etm__set_trace_param_etmv3(t_params, etm, i, etmidr); |
|
break; |
|
case __perf_cs_etmv4_magic: |
|
cs_etm__set_trace_param_etmv4(t_params, etm, i); |
|
break; |
|
case __perf_cs_ete_magic: |
|
cs_etm__set_trace_param_ete(t_params, etm, i); |
|
break; |
|
default: |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int cs_etm__init_decoder_params(struct cs_etm_decoder_params *d_params, |
|
struct cs_etm_queue *etmq, |
|
enum cs_etm_decoder_operation mode, |
|
bool formatted) |
|
{ |
|
int ret = -EINVAL; |
|
|
|
if (!(mode < CS_ETM_OPERATION_MAX)) |
|
goto out; |
|
|
|
d_params->packet_printer = cs_etm__packet_dump; |
|
d_params->operation = mode; |
|
d_params->data = etmq; |
|
d_params->formatted = formatted; |
|
d_params->fsyncs = false; |
|
d_params->hsyncs = false; |
|
d_params->frame_aligned = true; |
|
|
|
ret = 0; |
|
out: |
|
return ret; |
|
} |
|
|
|
static void cs_etm__dump_event(struct cs_etm_queue *etmq, |
|
struct auxtrace_buffer *buffer) |
|
{ |
|
int ret; |
|
const char *color = PERF_COLOR_BLUE; |
|
size_t buffer_used = 0; |
|
|
|
fprintf(stdout, "\n"); |
|
color_fprintf(stdout, color, |
|
". ... CoreSight %s Trace data: size %zu bytes\n", |
|
cs_etm_decoder__get_name(etmq->decoder), buffer->size); |
|
|
|
do { |
|
size_t consumed; |
|
|
|
ret = cs_etm_decoder__process_data_block( |
|
etmq->decoder, buffer->offset, |
|
&((u8 *)buffer->data)[buffer_used], |
|
buffer->size - buffer_used, &consumed); |
|
if (ret) |
|
break; |
|
|
|
buffer_used += consumed; |
|
} while (buffer_used < buffer->size); |
|
|
|
cs_etm_decoder__reset(etmq->decoder); |
|
} |
|
|
|
static int cs_etm__flush_events(struct perf_session *session, |
|
struct perf_tool *tool) |
|
{ |
|
struct cs_etm_auxtrace *etm = container_of(session->auxtrace, |
|
struct cs_etm_auxtrace, |
|
auxtrace); |
|
if (dump_trace) |
|
return 0; |
|
|
|
if (!tool->ordered_events) |
|
return -EINVAL; |
|
|
|
if (etm->timeless_decoding) |
|
return cs_etm__process_timeless_queues(etm, -1); |
|
|
|
return cs_etm__process_queues(etm); |
|
} |
|
|
|
static void cs_etm__free_traceid_queues(struct cs_etm_queue *etmq) |
|
{ |
|
int idx; |
|
uintptr_t priv; |
|
struct int_node *inode, *tmp; |
|
struct cs_etm_traceid_queue *tidq; |
|
struct intlist *traceid_queues_list = etmq->traceid_queues_list; |
|
|
|
intlist__for_each_entry_safe(inode, tmp, traceid_queues_list) { |
|
priv = (uintptr_t)inode->priv; |
|
idx = priv; |
|
|
|
/* Free this traceid_queue from the array */ |
|
tidq = etmq->traceid_queues[idx]; |
|
thread__zput(tidq->thread); |
|
zfree(&tidq->event_buf); |
|
zfree(&tidq->last_branch); |
|
zfree(&tidq->last_branch_rb); |
|
zfree(&tidq->prev_packet); |
|
zfree(&tidq->packet); |
|
zfree(&tidq); |
|
|
|
/* |
|
* Function intlist__remove() removes the inode from the list |
|
* and delete the memory associated to it. |
|
*/ |
|
intlist__remove(traceid_queues_list, inode); |
|
} |
|
|
|
/* Then the RB tree itself */ |
|
intlist__delete(traceid_queues_list); |
|
etmq->traceid_queues_list = NULL; |
|
|
|
/* finally free the traceid_queues array */ |
|
zfree(&etmq->traceid_queues); |
|
} |
|
|
|
static void cs_etm__free_queue(void *priv) |
|
{ |
|
struct cs_etm_queue *etmq = priv; |
|
|
|
if (!etmq) |
|
return; |
|
|
|
cs_etm_decoder__free(etmq->decoder); |
|
cs_etm__free_traceid_queues(etmq); |
|
free(etmq); |
|
} |
|
|
|
static void cs_etm__free_events(struct perf_session *session) |
|
{ |
|
unsigned int i; |
|
struct cs_etm_auxtrace *aux = container_of(session->auxtrace, |
|
struct cs_etm_auxtrace, |
|
auxtrace); |
|
struct auxtrace_queues *queues = &aux->queues; |
|
|
|
for (i = 0; i < queues->nr_queues; i++) { |
|
cs_etm__free_queue(queues->queue_array[i].priv); |
|
queues->queue_array[i].priv = NULL; |
|
} |
|
|
|
auxtrace_queues__free(queues); |
|
} |
|
|
|
static void cs_etm__free(struct perf_session *session) |
|
{ |
|
int i; |
|
struct int_node *inode, *tmp; |
|
struct cs_etm_auxtrace *aux = container_of(session->auxtrace, |
|
struct cs_etm_auxtrace, |
|
auxtrace); |
|
cs_etm__free_events(session); |
|
session->auxtrace = NULL; |
|
|
|
/* First remove all traceID/metadata nodes for the RB tree */ |
|
intlist__for_each_entry_safe(inode, tmp, traceid_list) |
|
intlist__remove(traceid_list, inode); |
|
/* Then the RB tree itself */ |
|
intlist__delete(traceid_list); |
|
|
|
for (i = 0; i < aux->num_cpu; i++) |
|
zfree(&aux->metadata[i]); |
|
|
|
thread__zput(aux->unknown_thread); |
|
zfree(&aux->metadata); |
|
zfree(&aux); |
|
} |
|
|
|
static bool cs_etm__evsel_is_auxtrace(struct perf_session *session, |
|
struct evsel *evsel) |
|
{ |
|
struct cs_etm_auxtrace *aux = container_of(session->auxtrace, |
|
struct cs_etm_auxtrace, |
|
auxtrace); |
|
|
|
return evsel->core.attr.type == aux->pmu_type; |
|
} |
|
|
|
static u8 cs_etm__cpu_mode(struct cs_etm_queue *etmq, u64 address) |
|
{ |
|
struct machine *machine; |
|
|
|
machine = etmq->etm->machine; |
|
|
|
if (address >= machine__kernel_start(machine)) { |
|
if (machine__is_host(machine)) |
|
return PERF_RECORD_MISC_KERNEL; |
|
else |
|
return PERF_RECORD_MISC_GUEST_KERNEL; |
|
} else { |
|
if (machine__is_host(machine)) |
|
return PERF_RECORD_MISC_USER; |
|
else if (perf_guest) |
|
return PERF_RECORD_MISC_GUEST_USER; |
|
else |
|
return PERF_RECORD_MISC_HYPERVISOR; |
|
} |
|
} |
|
|
|
static u32 cs_etm__mem_access(struct cs_etm_queue *etmq, u8 trace_chan_id, |
|
u64 address, size_t size, u8 *buffer) |
|
{ |
|
u8 cpumode; |
|
u64 offset; |
|
int len; |
|
struct thread *thread; |
|
struct machine *machine; |
|
struct addr_location al; |
|
struct cs_etm_traceid_queue *tidq; |
|
|
|
if (!etmq) |
|
return 0; |
|
|
|
machine = etmq->etm->machine; |
|
cpumode = cs_etm__cpu_mode(etmq, address); |
|
tidq = cs_etm__etmq_get_traceid_queue(etmq, trace_chan_id); |
|
if (!tidq) |
|
return 0; |
|
|
|
thread = tidq->thread; |
|
if (!thread) { |
|
if (cpumode != PERF_RECORD_MISC_KERNEL) |
|
return 0; |
|
thread = etmq->etm->unknown_thread; |
|
} |
|
|
|
if (!thread__find_map(thread, cpumode, address, &al) || !al.map->dso) |
|
return 0; |
|
|
|
if (al.map->dso->data.status == DSO_DATA_STATUS_ERROR && |
|
dso__data_status_seen(al.map->dso, DSO_DATA_STATUS_SEEN_ITRACE)) |
|
return 0; |
|
|
|
offset = al.map->map_ip(al.map, address); |
|
|
|
map__load(al.map); |
|
|
|
len = dso__data_read_offset(al.map->dso, machine, offset, buffer, size); |
|
|
|
if (len <= 0) { |
|
ui__warning_once("CS ETM Trace: Missing DSO. Use 'perf archive' or debuginfod to export data from the traced system.\n" |
|
" Enable CONFIG_PROC_KCORE or use option '-k /path/to/vmlinux' for kernel symbols.\n"); |
|
if (!al.map->dso->auxtrace_warned) { |
|
pr_err("CS ETM Trace: Debug data not found for address %#"PRIx64" in %s\n", |
|
address, |
|
al.map->dso->long_name ? al.map->dso->long_name : "Unknown"); |
|
al.map->dso->auxtrace_warned = true; |
|
} |
|
return 0; |
|
} |
|
|
|
return len; |
|
} |
|
|
|
static struct cs_etm_queue *cs_etm__alloc_queue(struct cs_etm_auxtrace *etm, |
|
bool formatted) |
|
{ |
|
struct cs_etm_decoder_params d_params; |
|
struct cs_etm_trace_params *t_params = NULL; |
|
struct cs_etm_queue *etmq; |
|
/* |
|
* Each queue can only contain data from one CPU when unformatted, so only one decoder is |
|
* needed. |
|
*/ |
|
int decoders = formatted ? etm->num_cpu : 1; |
|
|
|
etmq = zalloc(sizeof(*etmq)); |
|
if (!etmq) |
|
return NULL; |
|
|
|
etmq->traceid_queues_list = intlist__new(NULL); |
|
if (!etmq->traceid_queues_list) |
|
goto out_free; |
|
|
|
/* Use metadata to fill in trace parameters for trace decoder */ |
|
t_params = zalloc(sizeof(*t_params) * decoders); |
|
|
|
if (!t_params) |
|
goto out_free; |
|
|
|
if (cs_etm__init_trace_params(t_params, etm, decoders)) |
|
goto out_free; |
|
|
|
/* Set decoder parameters to decode trace packets */ |
|
if (cs_etm__init_decoder_params(&d_params, etmq, |
|
dump_trace ? CS_ETM_OPERATION_PRINT : |
|
CS_ETM_OPERATION_DECODE, |
|
formatted)) |
|
goto out_free; |
|
|
|
etmq->decoder = cs_etm_decoder__new(decoders, &d_params, |
|
t_params); |
|
|
|
if (!etmq->decoder) |
|
goto out_free; |
|
|
|
/* |
|
* Register a function to handle all memory accesses required by |
|
* the trace decoder library. |
|
*/ |
|
if (cs_etm_decoder__add_mem_access_cb(etmq->decoder, |
|
0x0L, ((u64) -1L), |
|
cs_etm__mem_access)) |
|
goto out_free_decoder; |
|
|
|
zfree(&t_params); |
|
return etmq; |
|
|
|
out_free_decoder: |
|
cs_etm_decoder__free(etmq->decoder); |
|
out_free: |
|
intlist__delete(etmq->traceid_queues_list); |
|
free(etmq); |
|
|
|
return NULL; |
|
} |
|
|
|
static int cs_etm__setup_queue(struct cs_etm_auxtrace *etm, |
|
struct auxtrace_queue *queue, |
|
unsigned int queue_nr, |
|
bool formatted) |
|
{ |
|
struct cs_etm_queue *etmq = queue->priv; |
|
|
|
if (list_empty(&queue->head) || etmq) |
|
return 0; |
|
|
|
etmq = cs_etm__alloc_queue(etm, formatted); |
|
|
|
if (!etmq) |
|
return -ENOMEM; |
|
|
|
queue->priv = etmq; |
|
etmq->etm = etm; |
|
etmq->queue_nr = queue_nr; |
|
etmq->offset = 0; |
|
|
|
return 0; |
|
} |
|
|
|
static int cs_etm__queue_first_cs_timestamp(struct cs_etm_auxtrace *etm, |
|
struct cs_etm_queue *etmq, |
|
unsigned int queue_nr) |
|
{ |
|
int ret = 0; |
|
unsigned int cs_queue_nr; |
|
u8 trace_chan_id; |
|
u64 cs_timestamp; |
|
|
|
/* |
|
* We are under a CPU-wide trace scenario. As such we need to know |
|
* when the code that generated the traces started to execute so that |
|
* it can be correlated with execution on other CPUs. So we get a |
|
* handle on the beginning of traces and decode until we find a |
|
* timestamp. The timestamp is then added to the auxtrace min heap |
|
* in order to know what nibble (of all the etmqs) to decode first. |
|
*/ |
|
while (1) { |
|
/* |
|
* Fetch an aux_buffer from this etmq. Bail if no more |
|
* blocks or an error has been encountered. |
|
*/ |
|
ret = cs_etm__get_data_block(etmq); |
|
if (ret <= 0) |
|
goto out; |
|
|
|
/* |
|
* Run decoder on the trace block. The decoder will stop when |
|
* encountering a CS timestamp, a full packet queue or the end of |
|
* trace for that block. |
|
*/ |
|
ret = cs_etm__decode_data_block(etmq); |
|
if (ret) |
|
goto out; |
|
|
|
/* |
|
* Function cs_etm_decoder__do_{hard|soft}_timestamp() does all |
|
* the timestamp calculation for us. |
|
*/ |
|
cs_timestamp = cs_etm__etmq_get_timestamp(etmq, &trace_chan_id); |
|
|
|
/* We found a timestamp, no need to continue. */ |
|
if (cs_timestamp) |
|
break; |
|
|
|
/* |
|
* We didn't find a timestamp so empty all the traceid packet |
|
* queues before looking for another timestamp packet, either |
|
* in the current data block or a new one. Packets that were |
|
* just decoded are useless since no timestamp has been |
|
* associated with them. As such simply discard them. |
|
*/ |
|
cs_etm__clear_all_packet_queues(etmq); |
|
} |
|
|
|
/* |
|
* We have a timestamp. Add it to the min heap to reflect when |
|
* instructions conveyed by the range packets of this traceID queue |
|
* started to execute. Once the same has been done for all the traceID |
|
* queues of each etmq, redenring and decoding can start in |
|
* chronological order. |
|
* |
|
* Note that packets decoded above are still in the traceID's packet |
|
* queue and will be processed in cs_etm__process_queues(). |
|
*/ |
|
cs_queue_nr = TO_CS_QUEUE_NR(queue_nr, trace_chan_id); |
|
ret = auxtrace_heap__add(&etm->heap, cs_queue_nr, cs_timestamp); |
|
out: |
|
return ret; |
|
} |
|
|
|
static inline |
|
void cs_etm__copy_last_branch_rb(struct cs_etm_queue *etmq, |
|
struct cs_etm_traceid_queue *tidq) |
|
{ |
|
struct branch_stack *bs_src = tidq->last_branch_rb; |
|
struct branch_stack *bs_dst = tidq->last_branch; |
|
size_t nr = 0; |
|
|
|
/* |
|
* Set the number of records before early exit: ->nr is used to |
|
* determine how many branches to copy from ->entries. |
|
*/ |
|
bs_dst->nr = bs_src->nr; |
|
|
|
/* |
|
* Early exit when there is nothing to copy. |
|
*/ |
|
if (!bs_src->nr) |
|
return; |
|
|
|
/* |
|
* As bs_src->entries is a circular buffer, we need to copy from it in |
|
* two steps. First, copy the branches from the most recently inserted |
|
* branch ->last_branch_pos until the end of bs_src->entries buffer. |
|
*/ |
|
nr = etmq->etm->synth_opts.last_branch_sz - tidq->last_branch_pos; |
|
memcpy(&bs_dst->entries[0], |
|
&bs_src->entries[tidq->last_branch_pos], |
|
sizeof(struct branch_entry) * nr); |
|
|
|
/* |
|
* If we wrapped around at least once, the branches from the beginning |
|
* of the bs_src->entries buffer and until the ->last_branch_pos element |
|
* are older valid branches: copy them over. The total number of |
|
* branches copied over will be equal to the number of branches asked by |
|
* the user in last_branch_sz. |
|
*/ |
|
if (bs_src->nr >= etmq->etm->synth_opts.last_branch_sz) { |
|
memcpy(&bs_dst->entries[nr], |
|
&bs_src->entries[0], |
|
sizeof(struct branch_entry) * tidq->last_branch_pos); |
|
} |
|
} |
|
|
|
static inline |
|
void cs_etm__reset_last_branch_rb(struct cs_etm_traceid_queue *tidq) |
|
{ |
|
tidq->last_branch_pos = 0; |
|
tidq->last_branch_rb->nr = 0; |
|
} |
|
|
|
static inline int cs_etm__t32_instr_size(struct cs_etm_queue *etmq, |
|
u8 trace_chan_id, u64 addr) |
|
{ |
|
u8 instrBytes[2]; |
|
|
|
cs_etm__mem_access(etmq, trace_chan_id, addr, |
|
ARRAY_SIZE(instrBytes), instrBytes); |
|
/* |
|
* T32 instruction size is indicated by bits[15:11] of the first |
|
* 16-bit word of the instruction: 0b11101, 0b11110 and 0b11111 |
|
* denote a 32-bit instruction. |
|
*/ |
|
return ((instrBytes[1] & 0xF8) >= 0xE8) ? 4 : 2; |
|
} |
|
|
|
static inline u64 cs_etm__first_executed_instr(struct cs_etm_packet *packet) |
|
{ |
|
/* Returns 0 for the CS_ETM_DISCONTINUITY packet */ |
|
if (packet->sample_type == CS_ETM_DISCONTINUITY) |
|
return 0; |
|
|
|
return packet->start_addr; |
|
} |
|
|
|
static inline |
|
u64 cs_etm__last_executed_instr(const struct cs_etm_packet *packet) |
|
{ |
|
/* Returns 0 for the CS_ETM_DISCONTINUITY packet */ |
|
if (packet->sample_type == CS_ETM_DISCONTINUITY) |
|
return 0; |
|
|
|
return packet->end_addr - packet->last_instr_size; |
|
} |
|
|
|
static inline u64 cs_etm__instr_addr(struct cs_etm_queue *etmq, |
|
u64 trace_chan_id, |
|
const struct cs_etm_packet *packet, |
|
u64 offset) |
|
{ |
|
if (packet->isa == CS_ETM_ISA_T32) { |
|
u64 addr = packet->start_addr; |
|
|
|
while (offset) { |
|
addr += cs_etm__t32_instr_size(etmq, |
|
trace_chan_id, addr); |
|
offset--; |
|
} |
|
return addr; |
|
} |
|
|
|
/* Assume a 4 byte instruction size (A32/A64) */ |
|
return packet->start_addr + offset * 4; |
|
} |
|
|
|
static void cs_etm__update_last_branch_rb(struct cs_etm_queue *etmq, |
|
struct cs_etm_traceid_queue *tidq) |
|
{ |
|
struct branch_stack *bs = tidq->last_branch_rb; |
|
struct branch_entry *be; |
|
|
|
/* |
|
* The branches are recorded in a circular buffer in reverse |
|
* chronological order: we start recording from the last element of the |
|
* buffer down. After writing the first element of the stack, move the |
|
* insert position back to the end of the buffer. |
|
*/ |
|
if (!tidq->last_branch_pos) |
|
tidq->last_branch_pos = etmq->etm->synth_opts.last_branch_sz; |
|
|
|
tidq->last_branch_pos -= 1; |
|
|
|
be = &bs->entries[tidq->last_branch_pos]; |
|
be->from = cs_etm__last_executed_instr(tidq->prev_packet); |
|
be->to = cs_etm__first_executed_instr(tidq->packet); |
|
/* No support for mispredict */ |
|
be->flags.mispred = 0; |
|
be->flags.predicted = 1; |
|
|
|
/* |
|
* Increment bs->nr until reaching the number of last branches asked by |
|
* the user on the command line. |
|
*/ |
|
if (bs->nr < etmq->etm->synth_opts.last_branch_sz) |
|
bs->nr += 1; |
|
} |
|
|
|
static int cs_etm__inject_event(union perf_event *event, |
|
struct perf_sample *sample, u64 type) |
|
{ |
|
event->header.size = perf_event__sample_event_size(sample, type, 0); |
|
return perf_event__synthesize_sample(event, type, 0, sample); |
|
} |
|
|
|
|
|
static int |
|
cs_etm__get_trace(struct cs_etm_queue *etmq) |
|
{ |
|
struct auxtrace_buffer *aux_buffer = etmq->buffer; |
|
struct auxtrace_buffer *old_buffer = aux_buffer; |
|
struct auxtrace_queue *queue; |
|
|
|
queue = &etmq->etm->queues.queue_array[etmq->queue_nr]; |
|
|
|
aux_buffer = auxtrace_buffer__next(queue, aux_buffer); |
|
|
|
/* If no more data, drop the previous auxtrace_buffer and return */ |
|
if (!aux_buffer) { |
|
if (old_buffer) |
|
auxtrace_buffer__drop_data(old_buffer); |
|
etmq->buf_len = 0; |
|
return 0; |
|
} |
|
|
|
etmq->buffer = aux_buffer; |
|
|
|
/* If the aux_buffer doesn't have data associated, try to load it */ |
|
if (!aux_buffer->data) { |
|
/* get the file desc associated with the perf data file */ |
|
int fd = perf_data__fd(etmq->etm->session->data); |
|
|
|
aux_buffer->data = auxtrace_buffer__get_data(aux_buffer, fd); |
|
if (!aux_buffer->data) |
|
return -ENOMEM; |
|
} |
|
|
|
/* If valid, drop the previous buffer */ |
|
if (old_buffer) |
|
auxtrace_buffer__drop_data(old_buffer); |
|
|
|
etmq->buf_used = 0; |
|
etmq->buf_len = aux_buffer->size; |
|
etmq->buf = aux_buffer->data; |
|
|
|
return etmq->buf_len; |
|
} |
|
|
|
static void cs_etm__set_pid_tid_cpu(struct cs_etm_auxtrace *etm, |
|
struct cs_etm_traceid_queue *tidq) |
|
{ |
|
if ((!tidq->thread) && (tidq->tid != -1)) |
|
tidq->thread = machine__find_thread(etm->machine, -1, |
|
tidq->tid); |
|
|
|
if (tidq->thread) |
|
tidq->pid = tidq->thread->pid_; |
|
} |
|
|
|
int cs_etm__etmq_set_tid(struct cs_etm_queue *etmq, |
|
pid_t tid, u8 trace_chan_id) |
|
{ |
|
int cpu, err = -EINVAL; |
|
struct cs_etm_auxtrace *etm = etmq->etm; |
|
struct cs_etm_traceid_queue *tidq; |
|
|
|
tidq = cs_etm__etmq_get_traceid_queue(etmq, trace_chan_id); |
|
if (!tidq) |
|
return err; |
|
|
|
if (cs_etm__get_cpu(trace_chan_id, &cpu) < 0) |
|
return err; |
|
|
|
err = machine__set_current_tid(etm->machine, cpu, tid, tid); |
|
if (err) |
|
return err; |
|
|
|
tidq->tid = tid; |
|
thread__zput(tidq->thread); |
|
|
|
cs_etm__set_pid_tid_cpu(etm, tidq); |
|
return 0; |
|
} |
|
|
|
bool cs_etm__etmq_is_timeless(struct cs_etm_queue *etmq) |
|
{ |
|
return !!etmq->etm->timeless_decoding; |
|
} |
|
|
|
static void cs_etm__copy_insn(struct cs_etm_queue *etmq, |
|
u64 trace_chan_id, |
|
const struct cs_etm_packet *packet, |
|
struct perf_sample *sample) |
|
{ |
|
/* |
|
* It's pointless to read instructions for the CS_ETM_DISCONTINUITY |
|
* packet, so directly bail out with 'insn_len' = 0. |
|
*/ |
|
if (packet->sample_type == CS_ETM_DISCONTINUITY) { |
|
sample->insn_len = 0; |
|
return; |
|
} |
|
|
|
/* |
|
* T32 instruction size might be 32-bit or 16-bit, decide by calling |
|
* cs_etm__t32_instr_size(). |
|
*/ |
|
if (packet->isa == CS_ETM_ISA_T32) |
|
sample->insn_len = cs_etm__t32_instr_size(etmq, trace_chan_id, |
|
sample->ip); |
|
/* Otherwise, A64 and A32 instruction size are always 32-bit. */ |
|
else |
|
sample->insn_len = 4; |
|
|
|
cs_etm__mem_access(etmq, trace_chan_id, sample->ip, |
|
sample->insn_len, (void *)sample->insn); |
|
} |
|
|
|
static int cs_etm__synth_instruction_sample(struct cs_etm_queue *etmq, |
|
struct cs_etm_traceid_queue *tidq, |
|
u64 addr, u64 period) |
|
{ |
|
int ret = 0; |
|
struct cs_etm_auxtrace *etm = etmq->etm; |
|
union perf_event *event = tidq->event_buf; |
|
struct perf_sample sample = {.ip = 0,}; |
|
|
|
event->sample.header.type = PERF_RECORD_SAMPLE; |
|
event->sample.header.misc = cs_etm__cpu_mode(etmq, addr); |
|
event->sample.header.size = sizeof(struct perf_event_header); |
|
|
|
if (!etm->timeless_decoding) |
|
sample.time = etm->latest_kernel_timestamp; |
|
sample.ip = addr; |
|
sample.pid = tidq->pid; |
|
sample.tid = tidq->tid; |
|
sample.id = etmq->etm->instructions_id; |
|
sample.stream_id = etmq->etm->instructions_id; |
|
sample.period = period; |
|
sample.cpu = tidq->packet->cpu; |
|
sample.flags = tidq->prev_packet->flags; |
|
sample.cpumode = event->sample.header.misc; |
|
|
|
cs_etm__copy_insn(etmq, tidq->trace_chan_id, tidq->packet, &sample); |
|
|
|
if (etm->synth_opts.last_branch) |
|
sample.branch_stack = tidq->last_branch; |
|
|
|
if (etm->synth_opts.inject) { |
|
ret = cs_etm__inject_event(event, &sample, |
|
etm->instructions_sample_type); |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
ret = perf_session__deliver_synth_event(etm->session, event, &sample); |
|
|
|
if (ret) |
|
pr_err( |
|
"CS ETM Trace: failed to deliver instruction event, error %d\n", |
|
ret); |
|
|
|
return ret; |
|
} |
|
|
|
/* |
|
* The cs etm packet encodes an instruction range between a branch target |
|
* and the next taken branch. Generate sample accordingly. |
|
*/ |
|
static int cs_etm__synth_branch_sample(struct cs_etm_queue *etmq, |
|
struct cs_etm_traceid_queue *tidq) |
|
{ |
|
int ret = 0; |
|
struct cs_etm_auxtrace *etm = etmq->etm; |
|
struct perf_sample sample = {.ip = 0,}; |
|
union perf_event *event = tidq->event_buf; |
|
struct dummy_branch_stack { |
|
u64 nr; |
|
u64 hw_idx; |
|
struct branch_entry entries; |
|
} dummy_bs; |
|
u64 ip; |
|
|
|
ip = cs_etm__last_executed_instr(tidq->prev_packet); |
|
|
|
event->sample.header.type = PERF_RECORD_SAMPLE; |
|
event->sample.header.misc = cs_etm__cpu_mode(etmq, ip); |
|
event->sample.header.size = sizeof(struct perf_event_header); |
|
|
|
if (!etm->timeless_decoding) |
|
sample.time = etm->latest_kernel_timestamp; |
|
sample.ip = ip; |
|
sample.pid = tidq->pid; |
|
sample.tid = tidq->tid; |
|
sample.addr = cs_etm__first_executed_instr(tidq->packet); |
|
sample.id = etmq->etm->branches_id; |
|
sample.stream_id = etmq->etm->branches_id; |
|
sample.period = 1; |
|
sample.cpu = tidq->packet->cpu; |
|
sample.flags = tidq->prev_packet->flags; |
|
sample.cpumode = event->sample.header.misc; |
|
|
|
cs_etm__copy_insn(etmq, tidq->trace_chan_id, tidq->prev_packet, |
|
&sample); |
|
|
|
/* |
|
* perf report cannot handle events without a branch stack |
|
*/ |
|
if (etm->synth_opts.last_branch) { |
|
dummy_bs = (struct dummy_branch_stack){ |
|
.nr = 1, |
|
.hw_idx = -1ULL, |
|
.entries = { |
|
.from = sample.ip, |
|
.to = sample.addr, |
|
}, |
|
}; |
|
sample.branch_stack = (struct branch_stack *)&dummy_bs; |
|
} |
|
|
|
if (etm->synth_opts.inject) { |
|
ret = cs_etm__inject_event(event, &sample, |
|
etm->branches_sample_type); |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
ret = perf_session__deliver_synth_event(etm->session, event, &sample); |
|
|
|
if (ret) |
|
pr_err( |
|
"CS ETM Trace: failed to deliver instruction event, error %d\n", |
|
ret); |
|
|
|
return ret; |
|
} |
|
|
|
struct cs_etm_synth { |
|
struct perf_tool dummy_tool; |
|
struct perf_session *session; |
|
}; |
|
|
|
static int cs_etm__event_synth(struct perf_tool *tool, |
|
union perf_event *event, |
|
struct perf_sample *sample __maybe_unused, |
|
struct machine *machine __maybe_unused) |
|
{ |
|
struct cs_etm_synth *cs_etm_synth = |
|
container_of(tool, struct cs_etm_synth, dummy_tool); |
|
|
|
return perf_session__deliver_synth_event(cs_etm_synth->session, |
|
event, NULL); |
|
} |
|
|
|
static int cs_etm__synth_event(struct perf_session *session, |
|
struct perf_event_attr *attr, u64 id) |
|
{ |
|
struct cs_etm_synth cs_etm_synth; |
|
|
|
memset(&cs_etm_synth, 0, sizeof(struct cs_etm_synth)); |
|
cs_etm_synth.session = session; |
|
|
|
return perf_event__synthesize_attr(&cs_etm_synth.dummy_tool, attr, 1, |
|
&id, cs_etm__event_synth); |
|
} |
|
|
|
static int cs_etm__synth_events(struct cs_etm_auxtrace *etm, |
|
struct perf_session *session) |
|
{ |
|
struct evlist *evlist = session->evlist; |
|
struct evsel *evsel; |
|
struct perf_event_attr attr; |
|
bool found = false; |
|
u64 id; |
|
int err; |
|
|
|
evlist__for_each_entry(evlist, evsel) { |
|
if (evsel->core.attr.type == etm->pmu_type) { |
|
found = true; |
|
break; |
|
} |
|
} |
|
|
|
if (!found) { |
|
pr_debug("No selected events with CoreSight Trace data\n"); |
|
return 0; |
|
} |
|
|
|
memset(&attr, 0, sizeof(struct perf_event_attr)); |
|
attr.size = sizeof(struct perf_event_attr); |
|
attr.type = PERF_TYPE_HARDWARE; |
|
attr.sample_type = evsel->core.attr.sample_type & PERF_SAMPLE_MASK; |
|
attr.sample_type |= PERF_SAMPLE_IP | PERF_SAMPLE_TID | |
|
PERF_SAMPLE_PERIOD; |
|
if (etm->timeless_decoding) |
|
attr.sample_type &= ~(u64)PERF_SAMPLE_TIME; |
|
else |
|
attr.sample_type |= PERF_SAMPLE_TIME; |
|
|
|
attr.exclude_user = evsel->core.attr.exclude_user; |
|
attr.exclude_kernel = evsel->core.attr.exclude_kernel; |
|
attr.exclude_hv = evsel->core.attr.exclude_hv; |
|
attr.exclude_host = evsel->core.attr.exclude_host; |
|
attr.exclude_guest = evsel->core.attr.exclude_guest; |
|
attr.sample_id_all = evsel->core.attr.sample_id_all; |
|
attr.read_format = evsel->core.attr.read_format; |
|
|
|
/* create new id val to be a fixed offset from evsel id */ |
|
id = evsel->core.id[0] + 1000000000; |
|
|
|
if (!id) |
|
id = 1; |
|
|
|
if (etm->synth_opts.branches) { |
|
attr.config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS; |
|
attr.sample_period = 1; |
|
attr.sample_type |= PERF_SAMPLE_ADDR; |
|
err = cs_etm__synth_event(session, &attr, id); |
|
if (err) |
|
return err; |
|
etm->sample_branches = true; |
|
etm->branches_sample_type = attr.sample_type; |
|
etm->branches_id = id; |
|
id += 1; |
|
attr.sample_type &= ~(u64)PERF_SAMPLE_ADDR; |
|
} |
|
|
|
if (etm->synth_opts.last_branch) { |
|
attr.sample_type |= PERF_SAMPLE_BRANCH_STACK; |
|
/* |
|
* We don't use the hardware index, but the sample generation |
|
* code uses the new format branch_stack with this field, |
|
* so the event attributes must indicate that it's present. |
|
*/ |
|
attr.branch_sample_type |= PERF_SAMPLE_BRANCH_HW_INDEX; |
|
} |
|
|
|
if (etm->synth_opts.instructions) { |
|
attr.config = PERF_COUNT_HW_INSTRUCTIONS; |
|
attr.sample_period = etm->synth_opts.period; |
|
etm->instructions_sample_period = attr.sample_period; |
|
err = cs_etm__synth_event(session, &attr, id); |
|
if (err) |
|
return err; |
|
etm->sample_instructions = true; |
|
etm->instructions_sample_type = attr.sample_type; |
|
etm->instructions_id = id; |
|
id += 1; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int cs_etm__sample(struct cs_etm_queue *etmq, |
|
struct cs_etm_traceid_queue *tidq) |
|
{ |
|
struct cs_etm_auxtrace *etm = etmq->etm; |
|
int ret; |
|
u8 trace_chan_id = tidq->trace_chan_id; |
|
u64 instrs_prev; |
|
|
|
/* Get instructions remainder from previous packet */ |
|
instrs_prev = tidq->period_instructions; |
|
|
|
tidq->period_instructions += tidq->packet->instr_count; |
|
|
|
/* |
|
* Record a branch when the last instruction in |
|
* PREV_PACKET is a branch. |
|
*/ |
|
if (etm->synth_opts.last_branch && |
|
tidq->prev_packet->sample_type == CS_ETM_RANGE && |
|
tidq->prev_packet->last_instr_taken_branch) |
|
cs_etm__update_last_branch_rb(etmq, tidq); |
|
|
|
if (etm->sample_instructions && |
|
tidq->period_instructions >= etm->instructions_sample_period) { |
|
/* |
|
* Emit instruction sample periodically |
|
* TODO: allow period to be defined in cycles and clock time |
|
*/ |
|
|
|
/* |
|
* Below diagram demonstrates the instruction samples |
|
* generation flows: |
|
* |
|
* Instrs Instrs Instrs Instrs |
|
* Sample(n) Sample(n+1) Sample(n+2) Sample(n+3) |
|
* | | | | |
|
* V V V V |
|
* -------------------------------------------------- |
|
* ^ ^ |
|
* | | |
|
* Period Period |
|
* instructions(Pi) instructions(Pi') |
|
* |
|
* | | |
|
* \---------------- -----------------/ |
|
* V |
|
* tidq->packet->instr_count |
|
* |
|
* Instrs Sample(n...) are the synthesised samples occurring |
|
* every etm->instructions_sample_period instructions - as |
|
* defined on the perf command line. Sample(n) is being the |
|
* last sample before the current etm packet, n+1 to n+3 |
|
* samples are generated from the current etm packet. |
|
* |
|
* tidq->packet->instr_count represents the number of |
|
* instructions in the current etm packet. |
|
* |
|
* Period instructions (Pi) contains the the number of |
|
* instructions executed after the sample point(n) from the |
|
* previous etm packet. This will always be less than |
|
* etm->instructions_sample_period. |
|
* |
|
* When generate new samples, it combines with two parts |
|
* instructions, one is the tail of the old packet and another |
|
* is the head of the new coming packet, to generate |
|
* sample(n+1); sample(n+2) and sample(n+3) consume the |
|
* instructions with sample period. After sample(n+3), the rest |
|
* instructions will be used by later packet and it is assigned |
|
* to tidq->period_instructions for next round calculation. |
|
*/ |
|
|
|
/* |
|
* Get the initial offset into the current packet instructions; |
|
* entry conditions ensure that instrs_prev is less than |
|
* etm->instructions_sample_period. |
|
*/ |
|
u64 offset = etm->instructions_sample_period - instrs_prev; |
|
u64 addr; |
|
|
|
/* Prepare last branches for instruction sample */ |
|
if (etm->synth_opts.last_branch) |
|
cs_etm__copy_last_branch_rb(etmq, tidq); |
|
|
|
while (tidq->period_instructions >= |
|
etm->instructions_sample_period) { |
|
/* |
|
* Calculate the address of the sampled instruction (-1 |
|
* as sample is reported as though instruction has just |
|
* been executed, but PC has not advanced to next |
|
* instruction) |
|
*/ |
|
addr = cs_etm__instr_addr(etmq, trace_chan_id, |
|
tidq->packet, offset - 1); |
|
ret = cs_etm__synth_instruction_sample( |
|
etmq, tidq, addr, |
|
etm->instructions_sample_period); |
|
if (ret) |
|
return ret; |
|
|
|
offset += etm->instructions_sample_period; |
|
tidq->period_instructions -= |
|
etm->instructions_sample_period; |
|
} |
|
} |
|
|
|
if (etm->sample_branches) { |
|
bool generate_sample = false; |
|
|
|
/* Generate sample for tracing on packet */ |
|
if (tidq->prev_packet->sample_type == CS_ETM_DISCONTINUITY) |
|
generate_sample = true; |
|
|
|
/* Generate sample for branch taken packet */ |
|
if (tidq->prev_packet->sample_type == CS_ETM_RANGE && |
|
tidq->prev_packet->last_instr_taken_branch) |
|
generate_sample = true; |
|
|
|
if (generate_sample) { |
|
ret = cs_etm__synth_branch_sample(etmq, tidq); |
|
if (ret) |
|
return ret; |
|
} |
|
} |
|
|
|
cs_etm__packet_swap(etm, tidq); |
|
|
|
return 0; |
|
} |
|
|
|
static int cs_etm__exception(struct cs_etm_traceid_queue *tidq) |
|
{ |
|
/* |
|
* When the exception packet is inserted, whether the last instruction |
|
* in previous range packet is taken branch or not, we need to force |
|
* to set 'prev_packet->last_instr_taken_branch' to true. This ensures |
|
* to generate branch sample for the instruction range before the |
|
* exception is trapped to kernel or before the exception returning. |
|
* |
|
* The exception packet includes the dummy address values, so don't |
|
* swap PACKET with PREV_PACKET. This keeps PREV_PACKET to be useful |
|
* for generating instruction and branch samples. |
|
*/ |
|
if (tidq->prev_packet->sample_type == CS_ETM_RANGE) |
|
tidq->prev_packet->last_instr_taken_branch = true; |
|
|
|
return 0; |
|
} |
|
|
|
static int cs_etm__flush(struct cs_etm_queue *etmq, |
|
struct cs_etm_traceid_queue *tidq) |
|
{ |
|
int err = 0; |
|
struct cs_etm_auxtrace *etm = etmq->etm; |
|
|
|
/* Handle start tracing packet */ |
|
if (tidq->prev_packet->sample_type == CS_ETM_EMPTY) |
|
goto swap_packet; |
|
|
|
if (etmq->etm->synth_opts.last_branch && |
|
tidq->prev_packet->sample_type == CS_ETM_RANGE) { |
|
u64 addr; |
|
|
|
/* Prepare last branches for instruction sample */ |
|
cs_etm__copy_last_branch_rb(etmq, tidq); |
|
|
|
/* |
|
* Generate a last branch event for the branches left in the |
|
* circular buffer at the end of the trace. |
|
* |
|
* Use the address of the end of the last reported execution |
|
* range |
|
*/ |
|
addr = cs_etm__last_executed_instr(tidq->prev_packet); |
|
|
|
err = cs_etm__synth_instruction_sample( |
|
etmq, tidq, addr, |
|
tidq->period_instructions); |
|
if (err) |
|
return err; |
|
|
|
tidq->period_instructions = 0; |
|
|
|
} |
|
|
|
if (etm->sample_branches && |
|
tidq->prev_packet->sample_type == CS_ETM_RANGE) { |
|
err = cs_etm__synth_branch_sample(etmq, tidq); |
|
if (err) |
|
return err; |
|
} |
|
|
|
swap_packet: |
|
cs_etm__packet_swap(etm, tidq); |
|
|
|
/* Reset last branches after flush the trace */ |
|
if (etm->synth_opts.last_branch) |
|
cs_etm__reset_last_branch_rb(tidq); |
|
|
|
return err; |
|
} |
|
|
|
static int cs_etm__end_block(struct cs_etm_queue *etmq, |
|
struct cs_etm_traceid_queue *tidq) |
|
{ |
|
int err; |
|
|
|
/* |
|
* It has no new packet coming and 'etmq->packet' contains the stale |
|
* packet which was set at the previous time with packets swapping; |
|
* so skip to generate branch sample to avoid stale packet. |
|
* |
|
* For this case only flush branch stack and generate a last branch |
|
* event for the branches left in the circular buffer at the end of |
|
* the trace. |
|
*/ |
|
if (etmq->etm->synth_opts.last_branch && |
|
tidq->prev_packet->sample_type == CS_ETM_RANGE) { |
|
u64 addr; |
|
|
|
/* Prepare last branches for instruction sample */ |
|
cs_etm__copy_last_branch_rb(etmq, tidq); |
|
|
|
/* |
|
* Use the address of the end of the last reported execution |
|
* range. |
|
*/ |
|
addr = cs_etm__last_executed_instr(tidq->prev_packet); |
|
|
|
err = cs_etm__synth_instruction_sample( |
|
etmq, tidq, addr, |
|
tidq->period_instructions); |
|
if (err) |
|
return err; |
|
|
|
tidq->period_instructions = 0; |
|
} |
|
|
|
return 0; |
|
} |
|
/* |
|
* cs_etm__get_data_block: Fetch a block from the auxtrace_buffer queue |
|
* if need be. |
|
* Returns: < 0 if error |
|
* = 0 if no more auxtrace_buffer to read |
|
* > 0 if the current buffer isn't empty yet |
|
*/ |
|
static int cs_etm__get_data_block(struct cs_etm_queue *etmq) |
|
{ |
|
int ret; |
|
|
|
if (!etmq->buf_len) { |
|
ret = cs_etm__get_trace(etmq); |
|
if (ret <= 0) |
|
return ret; |
|
/* |
|
* We cannot assume consecutive blocks in the data file |
|
* are contiguous, reset the decoder to force re-sync. |
|
*/ |
|
ret = cs_etm_decoder__reset(etmq->decoder); |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
return etmq->buf_len; |
|
} |
|
|
|
static bool cs_etm__is_svc_instr(struct cs_etm_queue *etmq, u8 trace_chan_id, |
|
struct cs_etm_packet *packet, |
|
u64 end_addr) |
|
{ |
|
/* Initialise to keep compiler happy */ |
|
u16 instr16 = 0; |
|
u32 instr32 = 0; |
|
u64 addr; |
|
|
|
switch (packet->isa) { |
|
case CS_ETM_ISA_T32: |
|
/* |
|
* The SVC of T32 is defined in ARM DDI 0487D.a, F5.1.247: |
|
* |
|
* b'15 b'8 |
|
* +-----------------+--------+ |
|
* | 1 1 0 1 1 1 1 1 | imm8 | |
|
* +-----------------+--------+ |
|
* |
|
* According to the specification, it only defines SVC for T32 |
|
* with 16 bits instruction and has no definition for 32bits; |
|
* so below only read 2 bytes as instruction size for T32. |
|
*/ |
|
addr = end_addr - 2; |
|
cs_etm__mem_access(etmq, trace_chan_id, addr, |
|
sizeof(instr16), (u8 *)&instr16); |
|
if ((instr16 & 0xFF00) == 0xDF00) |
|
return true; |
|
|
|
break; |
|
case CS_ETM_ISA_A32: |
|
/* |
|
* The SVC of A32 is defined in ARM DDI 0487D.a, F5.1.247: |
|
* |
|
* b'31 b'28 b'27 b'24 |
|
* +---------+---------+-------------------------+ |
|
* | !1111 | 1 1 1 1 | imm24 | |
|
* +---------+---------+-------------------------+ |
|
*/ |
|
addr = end_addr - 4; |
|
cs_etm__mem_access(etmq, trace_chan_id, addr, |
|
sizeof(instr32), (u8 *)&instr32); |
|
if ((instr32 & 0x0F000000) == 0x0F000000 && |
|
(instr32 & 0xF0000000) != 0xF0000000) |
|
return true; |
|
|
|
break; |
|
case CS_ETM_ISA_A64: |
|
/* |
|
* The SVC of A64 is defined in ARM DDI 0487D.a, C6.2.294: |
|
* |
|
* b'31 b'21 b'4 b'0 |
|
* +-----------------------+---------+-----------+ |
|
* | 1 1 0 1 0 1 0 0 0 0 0 | imm16 | 0 0 0 0 1 | |
|
* +-----------------------+---------+-----------+ |
|
*/ |
|
addr = end_addr - 4; |
|
cs_etm__mem_access(etmq, trace_chan_id, addr, |
|
sizeof(instr32), (u8 *)&instr32); |
|
if ((instr32 & 0xFFE0001F) == 0xd4000001) |
|
return true; |
|
|
|
break; |
|
case CS_ETM_ISA_UNKNOWN: |
|
default: |
|
break; |
|
} |
|
|
|
return false; |
|
} |
|
|
|
static bool cs_etm__is_syscall(struct cs_etm_queue *etmq, |
|
struct cs_etm_traceid_queue *tidq, u64 magic) |
|
{ |
|
u8 trace_chan_id = tidq->trace_chan_id; |
|
struct cs_etm_packet *packet = tidq->packet; |
|
struct cs_etm_packet *prev_packet = tidq->prev_packet; |
|
|
|
if (magic == __perf_cs_etmv3_magic) |
|
if (packet->exception_number == CS_ETMV3_EXC_SVC) |
|
return true; |
|
|
|
/* |
|
* ETMv4 exception type CS_ETMV4_EXC_CALL covers SVC, SMC and |
|
* HVC cases; need to check if it's SVC instruction based on |
|
* packet address. |
|
*/ |
|
if (magic == __perf_cs_etmv4_magic) { |
|
if (packet->exception_number == CS_ETMV4_EXC_CALL && |
|
cs_etm__is_svc_instr(etmq, trace_chan_id, prev_packet, |
|
prev_packet->end_addr)) |
|
return true; |
|
} |
|
|
|
return false; |
|
} |
|
|
|
static bool cs_etm__is_async_exception(struct cs_etm_traceid_queue *tidq, |
|
u64 magic) |
|
{ |
|
struct cs_etm_packet *packet = tidq->packet; |
|
|
|
if (magic == __perf_cs_etmv3_magic) |
|
if (packet->exception_number == CS_ETMV3_EXC_DEBUG_HALT || |
|
packet->exception_number == CS_ETMV3_EXC_ASYNC_DATA_ABORT || |
|
packet->exception_number == CS_ETMV3_EXC_PE_RESET || |
|
packet->exception_number == CS_ETMV3_EXC_IRQ || |
|
packet->exception_number == CS_ETMV3_EXC_FIQ) |
|
return true; |
|
|
|
if (magic == __perf_cs_etmv4_magic) |
|
if (packet->exception_number == CS_ETMV4_EXC_RESET || |
|
packet->exception_number == CS_ETMV4_EXC_DEBUG_HALT || |
|
packet->exception_number == CS_ETMV4_EXC_SYSTEM_ERROR || |
|
packet->exception_number == CS_ETMV4_EXC_INST_DEBUG || |
|
packet->exception_number == CS_ETMV4_EXC_DATA_DEBUG || |
|
packet->exception_number == CS_ETMV4_EXC_IRQ || |
|
packet->exception_number == CS_ETMV4_EXC_FIQ) |
|
return true; |
|
|
|
return false; |
|
} |
|
|
|
static bool cs_etm__is_sync_exception(struct cs_etm_queue *etmq, |
|
struct cs_etm_traceid_queue *tidq, |
|
u64 magic) |
|
{ |
|
u8 trace_chan_id = tidq->trace_chan_id; |
|
struct cs_etm_packet *packet = tidq->packet; |
|
struct cs_etm_packet *prev_packet = tidq->prev_packet; |
|
|
|
if (magic == __perf_cs_etmv3_magic) |
|
if (packet->exception_number == CS_ETMV3_EXC_SMC || |
|
packet->exception_number == CS_ETMV3_EXC_HYP || |
|
packet->exception_number == CS_ETMV3_EXC_JAZELLE_THUMBEE || |
|
packet->exception_number == CS_ETMV3_EXC_UNDEFINED_INSTR || |
|
packet->exception_number == CS_ETMV3_EXC_PREFETCH_ABORT || |
|
packet->exception_number == CS_ETMV3_EXC_DATA_FAULT || |
|
packet->exception_number == CS_ETMV3_EXC_GENERIC) |
|
return true; |
|
|
|
if (magic == __perf_cs_etmv4_magic) { |
|
if (packet->exception_number == CS_ETMV4_EXC_TRAP || |
|
packet->exception_number == CS_ETMV4_EXC_ALIGNMENT || |
|
packet->exception_number == CS_ETMV4_EXC_INST_FAULT || |
|
packet->exception_number == CS_ETMV4_EXC_DATA_FAULT) |
|
return true; |
|
|
|
/* |
|
* For CS_ETMV4_EXC_CALL, except SVC other instructions |
|
* (SMC, HVC) are taken as sync exceptions. |
|
*/ |
|
if (packet->exception_number == CS_ETMV4_EXC_CALL && |
|
!cs_etm__is_svc_instr(etmq, trace_chan_id, prev_packet, |
|
prev_packet->end_addr)) |
|
return true; |
|
|
|
/* |
|
* ETMv4 has 5 bits for exception number; if the numbers |
|
* are in the range ( CS_ETMV4_EXC_FIQ, CS_ETMV4_EXC_END ] |
|
* they are implementation defined exceptions. |
|
* |
|
* For this case, simply take it as sync exception. |
|
*/ |
|
if (packet->exception_number > CS_ETMV4_EXC_FIQ && |
|
packet->exception_number <= CS_ETMV4_EXC_END) |
|
return true; |
|
} |
|
|
|
return false; |
|
} |
|
|
|
static int cs_etm__set_sample_flags(struct cs_etm_queue *etmq, |
|
struct cs_etm_traceid_queue *tidq) |
|
{ |
|
struct cs_etm_packet *packet = tidq->packet; |
|
struct cs_etm_packet *prev_packet = tidq->prev_packet; |
|
u8 trace_chan_id = tidq->trace_chan_id; |
|
u64 magic; |
|
int ret; |
|
|
|
switch (packet->sample_type) { |
|
case CS_ETM_RANGE: |
|
/* |
|
* Immediate branch instruction without neither link nor |
|
* return flag, it's normal branch instruction within |
|
* the function. |
|
*/ |
|
if (packet->last_instr_type == OCSD_INSTR_BR && |
|
packet->last_instr_subtype == OCSD_S_INSTR_NONE) { |
|
packet->flags = PERF_IP_FLAG_BRANCH; |
|
|
|
if (packet->last_instr_cond) |
|
packet->flags |= PERF_IP_FLAG_CONDITIONAL; |
|
} |
|
|
|
/* |
|
* Immediate branch instruction with link (e.g. BL), this is |
|
* branch instruction for function call. |
|
*/ |
|
if (packet->last_instr_type == OCSD_INSTR_BR && |
|
packet->last_instr_subtype == OCSD_S_INSTR_BR_LINK) |
|
packet->flags = PERF_IP_FLAG_BRANCH | |
|
PERF_IP_FLAG_CALL; |
|
|
|
/* |
|
* Indirect branch instruction with link (e.g. BLR), this is |
|
* branch instruction for function call. |
|
*/ |
|
if (packet->last_instr_type == OCSD_INSTR_BR_INDIRECT && |
|
packet->last_instr_subtype == OCSD_S_INSTR_BR_LINK) |
|
packet->flags = PERF_IP_FLAG_BRANCH | |
|
PERF_IP_FLAG_CALL; |
|
|
|
/* |
|
* Indirect branch instruction with subtype of |
|
* OCSD_S_INSTR_V7_IMPLIED_RET, this is explicit hint for |
|
* function return for A32/T32. |
|
*/ |
|
if (packet->last_instr_type == OCSD_INSTR_BR_INDIRECT && |
|
packet->last_instr_subtype == OCSD_S_INSTR_V7_IMPLIED_RET) |
|
packet->flags = PERF_IP_FLAG_BRANCH | |
|
PERF_IP_FLAG_RETURN; |
|
|
|
/* |
|
* Indirect branch instruction without link (e.g. BR), usually |
|
* this is used for function return, especially for functions |
|
* within dynamic link lib. |
|
*/ |
|
if (packet->last_instr_type == OCSD_INSTR_BR_INDIRECT && |
|
packet->last_instr_subtype == OCSD_S_INSTR_NONE) |
|
packet->flags = PERF_IP_FLAG_BRANCH | |
|
PERF_IP_FLAG_RETURN; |
|
|
|
/* Return instruction for function return. */ |
|
if (packet->last_instr_type == OCSD_INSTR_BR_INDIRECT && |
|
packet->last_instr_subtype == OCSD_S_INSTR_V8_RET) |
|
packet->flags = PERF_IP_FLAG_BRANCH | |
|
PERF_IP_FLAG_RETURN; |
|
|
|
/* |
|
* Decoder might insert a discontinuity in the middle of |
|
* instruction packets, fixup prev_packet with flag |
|
* PERF_IP_FLAG_TRACE_BEGIN to indicate restarting trace. |
|
*/ |
|
if (prev_packet->sample_type == CS_ETM_DISCONTINUITY) |
|
prev_packet->flags |= PERF_IP_FLAG_BRANCH | |
|
PERF_IP_FLAG_TRACE_BEGIN; |
|
|
|
/* |
|
* If the previous packet is an exception return packet |
|
* and the return address just follows SVC instruction, |
|
* it needs to calibrate the previous packet sample flags |
|
* as PERF_IP_FLAG_SYSCALLRET. |
|
*/ |
|
if (prev_packet->flags == (PERF_IP_FLAG_BRANCH | |
|
PERF_IP_FLAG_RETURN | |
|
PERF_IP_FLAG_INTERRUPT) && |
|
cs_etm__is_svc_instr(etmq, trace_chan_id, |
|
packet, packet->start_addr)) |
|
prev_packet->flags = PERF_IP_FLAG_BRANCH | |
|
PERF_IP_FLAG_RETURN | |
|
PERF_IP_FLAG_SYSCALLRET; |
|
break; |
|
case CS_ETM_DISCONTINUITY: |
|
/* |
|
* The trace is discontinuous, if the previous packet is |
|
* instruction packet, set flag PERF_IP_FLAG_TRACE_END |
|
* for previous packet. |
|
*/ |
|
if (prev_packet->sample_type == CS_ETM_RANGE) |
|
prev_packet->flags |= PERF_IP_FLAG_BRANCH | |
|
PERF_IP_FLAG_TRACE_END; |
|
break; |
|
case CS_ETM_EXCEPTION: |
|
ret = cs_etm__get_magic(packet->trace_chan_id, &magic); |
|
if (ret) |
|
return ret; |
|
|
|
/* The exception is for system call. */ |
|
if (cs_etm__is_syscall(etmq, tidq, magic)) |
|
packet->flags = PERF_IP_FLAG_BRANCH | |
|
PERF_IP_FLAG_CALL | |
|
PERF_IP_FLAG_SYSCALLRET; |
|
/* |
|
* The exceptions are triggered by external signals from bus, |
|
* interrupt controller, debug module, PE reset or halt. |
|
*/ |
|
else if (cs_etm__is_async_exception(tidq, magic)) |
|
packet->flags = PERF_IP_FLAG_BRANCH | |
|
PERF_IP_FLAG_CALL | |
|
PERF_IP_FLAG_ASYNC | |
|
PERF_IP_FLAG_INTERRUPT; |
|
/* |
|
* Otherwise, exception is caused by trap, instruction & |
|
* data fault, or alignment errors. |
|
*/ |
|
else if (cs_etm__is_sync_exception(etmq, tidq, magic)) |
|
packet->flags = PERF_IP_FLAG_BRANCH | |
|
PERF_IP_FLAG_CALL | |
|
PERF_IP_FLAG_INTERRUPT; |
|
|
|
/* |
|
* When the exception packet is inserted, since exception |
|
* packet is not used standalone for generating samples |
|
* and it's affiliation to the previous instruction range |
|
* packet; so set previous range packet flags to tell perf |
|
* it is an exception taken branch. |
|
*/ |
|
if (prev_packet->sample_type == CS_ETM_RANGE) |
|
prev_packet->flags = packet->flags; |
|
break; |
|
case CS_ETM_EXCEPTION_RET: |
|
/* |
|
* When the exception return packet is inserted, since |
|
* exception return packet is not used standalone for |
|
* generating samples and it's affiliation to the previous |
|
* instruction range packet; so set previous range packet |
|
* flags to tell perf it is an exception return branch. |
|
* |
|
* The exception return can be for either system call or |
|
* other exception types; unfortunately the packet doesn't |
|
* contain exception type related info so we cannot decide |
|
* the exception type purely based on exception return packet. |
|
* If we record the exception number from exception packet and |
|
* reuse it for exception return packet, this is not reliable |
|
* due the trace can be discontinuity or the interrupt can |
|
* be nested, thus the recorded exception number cannot be |
|
* used for exception return packet for these two cases. |
|
* |
|
* For exception return packet, we only need to distinguish the |
|
* packet is for system call or for other types. Thus the |
|
* decision can be deferred when receive the next packet which |
|
* contains the return address, based on the return address we |
|
* can read out the previous instruction and check if it's a |
|
* system call instruction and then calibrate the sample flag |
|
* as needed. |
|
*/ |
|
if (prev_packet->sample_type == CS_ETM_RANGE) |
|
prev_packet->flags = PERF_IP_FLAG_BRANCH | |
|
PERF_IP_FLAG_RETURN | |
|
PERF_IP_FLAG_INTERRUPT; |
|
break; |
|
case CS_ETM_EMPTY: |
|
default: |
|
break; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int cs_etm__decode_data_block(struct cs_etm_queue *etmq) |
|
{ |
|
int ret = 0; |
|
size_t processed = 0; |
|
|
|
/* |
|
* Packets are decoded and added to the decoder's packet queue |
|
* until the decoder packet processing callback has requested that |
|
* processing stops or there is nothing left in the buffer. Normal |
|
* operations that stop processing are a timestamp packet or a full |
|
* decoder buffer queue. |
|
*/ |
|
ret = cs_etm_decoder__process_data_block(etmq->decoder, |
|
etmq->offset, |
|
&etmq->buf[etmq->buf_used], |
|
etmq->buf_len, |
|
&processed); |
|
if (ret) |
|
goto out; |
|
|
|
etmq->offset += processed; |
|
etmq->buf_used += processed; |
|
etmq->buf_len -= processed; |
|
|
|
out: |
|
return ret; |
|
} |
|
|
|
static int cs_etm__process_traceid_queue(struct cs_etm_queue *etmq, |
|
struct cs_etm_traceid_queue *tidq) |
|
{ |
|
int ret; |
|
struct cs_etm_packet_queue *packet_queue; |
|
|
|
packet_queue = &tidq->packet_queue; |
|
|
|
/* Process each packet in this chunk */ |
|
while (1) { |
|
ret = cs_etm_decoder__get_packet(packet_queue, |
|
tidq->packet); |
|
if (ret <= 0) |
|
/* |
|
* Stop processing this chunk on |
|
* end of data or error |
|
*/ |
|
break; |
|
|
|
/* |
|
* Since packet addresses are swapped in packet |
|
* handling within below switch() statements, |
|
* thus setting sample flags must be called |
|
* prior to switch() statement to use address |
|
* information before packets swapping. |
|
*/ |
|
ret = cs_etm__set_sample_flags(etmq, tidq); |
|
if (ret < 0) |
|
break; |
|
|
|
switch (tidq->packet->sample_type) { |
|
case CS_ETM_RANGE: |
|
/* |
|
* If the packet contains an instruction |
|
* range, generate instruction sequence |
|
* events. |
|
*/ |
|
cs_etm__sample(etmq, tidq); |
|
break; |
|
case CS_ETM_EXCEPTION: |
|
case CS_ETM_EXCEPTION_RET: |
|
/* |
|
* If the exception packet is coming, |
|
* make sure the previous instruction |
|
* range packet to be handled properly. |
|
*/ |
|
cs_etm__exception(tidq); |
|
break; |
|
case CS_ETM_DISCONTINUITY: |
|
/* |
|
* Discontinuity in trace, flush |
|
* previous branch stack |
|
*/ |
|
cs_etm__flush(etmq, tidq); |
|
break; |
|
case CS_ETM_EMPTY: |
|
/* |
|
* Should not receive empty packet, |
|
* report error. |
|
*/ |
|
pr_err("CS ETM Trace: empty packet\n"); |
|
return -EINVAL; |
|
default: |
|
break; |
|
} |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
static void cs_etm__clear_all_traceid_queues(struct cs_etm_queue *etmq) |
|
{ |
|
int idx; |
|
struct int_node *inode; |
|
struct cs_etm_traceid_queue *tidq; |
|
struct intlist *traceid_queues_list = etmq->traceid_queues_list; |
|
|
|
intlist__for_each_entry(inode, traceid_queues_list) { |
|
idx = (int)(intptr_t)inode->priv; |
|
tidq = etmq->traceid_queues[idx]; |
|
|
|
/* Ignore return value */ |
|
cs_etm__process_traceid_queue(etmq, tidq); |
|
|
|
/* |
|
* Generate an instruction sample with the remaining |
|
* branchstack entries. |
|
*/ |
|
cs_etm__flush(etmq, tidq); |
|
} |
|
} |
|
|
|
static int cs_etm__run_decoder(struct cs_etm_queue *etmq) |
|
{ |
|
int err = 0; |
|
struct cs_etm_traceid_queue *tidq; |
|
|
|
tidq = cs_etm__etmq_get_traceid_queue(etmq, CS_ETM_PER_THREAD_TRACEID); |
|
if (!tidq) |
|
return -EINVAL; |
|
|
|
/* Go through each buffer in the queue and decode them one by one */ |
|
while (1) { |
|
err = cs_etm__get_data_block(etmq); |
|
if (err <= 0) |
|
return err; |
|
|
|
/* Run trace decoder until buffer consumed or end of trace */ |
|
do { |
|
err = cs_etm__decode_data_block(etmq); |
|
if (err) |
|
return err; |
|
|
|
/* |
|
* Process each packet in this chunk, nothing to do if |
|
* an error occurs other than hoping the next one will |
|
* be better. |
|
*/ |
|
err = cs_etm__process_traceid_queue(etmq, tidq); |
|
|
|
} while (etmq->buf_len); |
|
|
|
if (err == 0) |
|
/* Flush any remaining branch stack entries */ |
|
err = cs_etm__end_block(etmq, tidq); |
|
} |
|
|
|
return err; |
|
} |
|
|
|
static int cs_etm__process_timeless_queues(struct cs_etm_auxtrace *etm, |
|
pid_t tid) |
|
{ |
|
unsigned int i; |
|
struct auxtrace_queues *queues = &etm->queues; |
|
|
|
for (i = 0; i < queues->nr_queues; i++) { |
|
struct auxtrace_queue *queue = &etm->queues.queue_array[i]; |
|
struct cs_etm_queue *etmq = queue->priv; |
|
struct cs_etm_traceid_queue *tidq; |
|
|
|
if (!etmq) |
|
continue; |
|
|
|
tidq = cs_etm__etmq_get_traceid_queue(etmq, |
|
CS_ETM_PER_THREAD_TRACEID); |
|
|
|
if (!tidq) |
|
continue; |
|
|
|
if ((tid == -1) || (tidq->tid == tid)) { |
|
cs_etm__set_pid_tid_cpu(etm, tidq); |
|
cs_etm__run_decoder(etmq); |
|
} |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int cs_etm__process_queues(struct cs_etm_auxtrace *etm) |
|
{ |
|
int ret = 0; |
|
unsigned int cs_queue_nr, queue_nr, i; |
|
u8 trace_chan_id; |
|
u64 cs_timestamp; |
|
struct auxtrace_queue *queue; |
|
struct cs_etm_queue *etmq; |
|
struct cs_etm_traceid_queue *tidq; |
|
|
|
/* |
|
* Pre-populate the heap with one entry from each queue so that we can |
|
* start processing in time order across all queues. |
|
*/ |
|
for (i = 0; i < etm->queues.nr_queues; i++) { |
|
etmq = etm->queues.queue_array[i].priv; |
|
if (!etmq) |
|
continue; |
|
|
|
ret = cs_etm__queue_first_cs_timestamp(etm, etmq, i); |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
while (1) { |
|
if (!etm->heap.heap_cnt) |
|
goto out; |
|
|
|
/* Take the entry at the top of the min heap */ |
|
cs_queue_nr = etm->heap.heap_array[0].queue_nr; |
|
queue_nr = TO_QUEUE_NR(cs_queue_nr); |
|
trace_chan_id = TO_TRACE_CHAN_ID(cs_queue_nr); |
|
queue = &etm->queues.queue_array[queue_nr]; |
|
etmq = queue->priv; |
|
|
|
/* |
|
* Remove the top entry from the heap since we are about |
|
* to process it. |
|
*/ |
|
auxtrace_heap__pop(&etm->heap); |
|
|
|
tidq = cs_etm__etmq_get_traceid_queue(etmq, trace_chan_id); |
|
if (!tidq) { |
|
/* |
|
* No traceID queue has been allocated for this traceID, |
|
* which means something somewhere went very wrong. No |
|
* other choice than simply exit. |
|
*/ |
|
ret = -EINVAL; |
|
goto out; |
|
} |
|
|
|
/* |
|
* Packets associated with this timestamp are already in |
|
* the etmq's traceID queue, so process them. |
|
*/ |
|
ret = cs_etm__process_traceid_queue(etmq, tidq); |
|
if (ret < 0) |
|
goto out; |
|
|
|
/* |
|
* Packets for this timestamp have been processed, time to |
|
* move on to the next timestamp, fetching a new auxtrace_buffer |
|
* if need be. |
|
*/ |
|
refetch: |
|
ret = cs_etm__get_data_block(etmq); |
|
if (ret < 0) |
|
goto out; |
|
|
|
/* |
|
* No more auxtrace_buffers to process in this etmq, simply |
|
* move on to another entry in the auxtrace_heap. |
|
*/ |
|
if (!ret) |
|
continue; |
|
|
|
ret = cs_etm__decode_data_block(etmq); |
|
if (ret) |
|
goto out; |
|
|
|
cs_timestamp = cs_etm__etmq_get_timestamp(etmq, &trace_chan_id); |
|
|
|
if (!cs_timestamp) { |
|
/* |
|
* Function cs_etm__decode_data_block() returns when |
|
* there is no more traces to decode in the current |
|
* auxtrace_buffer OR when a timestamp has been |
|
* encountered on any of the traceID queues. Since we |
|
* did not get a timestamp, there is no more traces to |
|
* process in this auxtrace_buffer. As such empty and |
|
* flush all traceID queues. |
|
*/ |
|
cs_etm__clear_all_traceid_queues(etmq); |
|
|
|
/* Fetch another auxtrace_buffer for this etmq */ |
|
goto refetch; |
|
} |
|
|
|
/* |
|
* Add to the min heap the timestamp for packets that have |
|
* just been decoded. They will be processed and synthesized |
|
* during the next call to cs_etm__process_traceid_queue() for |
|
* this queue/traceID. |
|
*/ |
|
cs_queue_nr = TO_CS_QUEUE_NR(queue_nr, trace_chan_id); |
|
ret = auxtrace_heap__add(&etm->heap, cs_queue_nr, cs_timestamp); |
|
} |
|
|
|
out: |
|
return ret; |
|
} |
|
|
|
static int cs_etm__process_itrace_start(struct cs_etm_auxtrace *etm, |
|
union perf_event *event) |
|
{ |
|
struct thread *th; |
|
|
|
if (etm->timeless_decoding) |
|
return 0; |
|
|
|
/* |
|
* Add the tid/pid to the log so that we can get a match when |
|
* we get a contextID from the decoder. |
|
*/ |
|
th = machine__findnew_thread(etm->machine, |
|
event->itrace_start.pid, |
|
event->itrace_start.tid); |
|
if (!th) |
|
return -ENOMEM; |
|
|
|
thread__put(th); |
|
|
|
return 0; |
|
} |
|
|
|
static int cs_etm__process_switch_cpu_wide(struct cs_etm_auxtrace *etm, |
|
union perf_event *event) |
|
{ |
|
struct thread *th; |
|
bool out = event->header.misc & PERF_RECORD_MISC_SWITCH_OUT; |
|
|
|
/* |
|
* Context switch in per-thread mode are irrelevant since perf |
|
* will start/stop tracing as the process is scheduled. |
|
*/ |
|
if (etm->timeless_decoding) |
|
return 0; |
|
|
|
/* |
|
* SWITCH_IN events carry the next process to be switched out while |
|
* SWITCH_OUT events carry the process to be switched in. As such |
|
* we don't care about IN events. |
|
*/ |
|
if (!out) |
|
return 0; |
|
|
|
/* |
|
* Add the tid/pid to the log so that we can get a match when |
|
* we get a contextID from the decoder. |
|
*/ |
|
th = machine__findnew_thread(etm->machine, |
|
event->context_switch.next_prev_pid, |
|
event->context_switch.next_prev_tid); |
|
if (!th) |
|
return -ENOMEM; |
|
|
|
thread__put(th); |
|
|
|
return 0; |
|
} |
|
|
|
static int cs_etm__process_event(struct perf_session *session, |
|
union perf_event *event, |
|
struct perf_sample *sample, |
|
struct perf_tool *tool) |
|
{ |
|
u64 sample_kernel_timestamp; |
|
struct cs_etm_auxtrace *etm = container_of(session->auxtrace, |
|
struct cs_etm_auxtrace, |
|
auxtrace); |
|
|
|
if (dump_trace) |
|
return 0; |
|
|
|
if (!tool->ordered_events) { |
|
pr_err("CoreSight ETM Trace requires ordered events\n"); |
|
return -EINVAL; |
|
} |
|
|
|
if (sample->time && (sample->time != (u64) -1)) |
|
sample_kernel_timestamp = sample->time; |
|
else |
|
sample_kernel_timestamp = 0; |
|
|
|
/* |
|
* Don't wait for cs_etm__flush_events() in per-thread/timeless mode to start the decode. We |
|
* need the tid of the PERF_RECORD_EXIT event to assign to the synthesised samples because |
|
* ETM_OPT_CTXTID is not enabled. |
|
*/ |
|
if (etm->timeless_decoding && |
|
event->header.type == PERF_RECORD_EXIT) |
|
return cs_etm__process_timeless_queues(etm, |
|
event->fork.tid); |
|
|
|
if (event->header.type == PERF_RECORD_ITRACE_START) |
|
return cs_etm__process_itrace_start(etm, event); |
|
else if (event->header.type == PERF_RECORD_SWITCH_CPU_WIDE) |
|
return cs_etm__process_switch_cpu_wide(etm, event); |
|
|
|
if (!etm->timeless_decoding && event->header.type == PERF_RECORD_AUX) { |
|
/* |
|
* Record the latest kernel timestamp available in the header |
|
* for samples so that synthesised samples occur from this point |
|
* onwards. |
|
*/ |
|
etm->latest_kernel_timestamp = sample_kernel_timestamp; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static void dump_queued_data(struct cs_etm_auxtrace *etm, |
|
struct perf_record_auxtrace *event) |
|
{ |
|
struct auxtrace_buffer *buf; |
|
unsigned int i; |
|
/* |
|
* Find all buffers with same reference in the queues and dump them. |
|
* This is because the queues can contain multiple entries of the same |
|
* buffer that were split on aux records. |
|
*/ |
|
for (i = 0; i < etm->queues.nr_queues; ++i) |
|
list_for_each_entry(buf, &etm->queues.queue_array[i].head, list) |
|
if (buf->reference == event->reference) |
|
cs_etm__dump_event(etm->queues.queue_array[i].priv, buf); |
|
} |
|
|
|
static int cs_etm__process_auxtrace_event(struct perf_session *session, |
|
union perf_event *event, |
|
struct perf_tool *tool __maybe_unused) |
|
{ |
|
struct cs_etm_auxtrace *etm = container_of(session->auxtrace, |
|
struct cs_etm_auxtrace, |
|
auxtrace); |
|
if (!etm->data_queued) { |
|
struct auxtrace_buffer *buffer; |
|
off_t data_offset; |
|
int fd = perf_data__fd(session->data); |
|
bool is_pipe = perf_data__is_pipe(session->data); |
|
int err; |
|
int idx = event->auxtrace.idx; |
|
|
|
if (is_pipe) |
|
data_offset = 0; |
|
else { |
|
data_offset = lseek(fd, 0, SEEK_CUR); |
|
if (data_offset == -1) |
|
return -errno; |
|
} |
|
|
|
err = auxtrace_queues__add_event(&etm->queues, session, |
|
event, data_offset, &buffer); |
|
if (err) |
|
return err; |
|
|
|
/* |
|
* Knowing if the trace is formatted or not requires a lookup of |
|
* the aux record so only works in non-piped mode where data is |
|
* queued in cs_etm__queue_aux_records(). Always assume |
|
* formatted in piped mode (true). |
|
*/ |
|
err = cs_etm__setup_queue(etm, &etm->queues.queue_array[idx], |
|
idx, true); |
|
if (err) |
|
return err; |
|
|
|
if (dump_trace) |
|
if (auxtrace_buffer__get_data(buffer, fd)) { |
|
cs_etm__dump_event(etm->queues.queue_array[idx].priv, buffer); |
|
auxtrace_buffer__put_data(buffer); |
|
} |
|
} else if (dump_trace) |
|
dump_queued_data(etm, &event->auxtrace); |
|
|
|
return 0; |
|
} |
|
|
|
static bool cs_etm__is_timeless_decoding(struct cs_etm_auxtrace *etm) |
|
{ |
|
struct evsel *evsel; |
|
struct evlist *evlist = etm->session->evlist; |
|
bool timeless_decoding = true; |
|
|
|
/* Override timeless mode with user input from --itrace=Z */ |
|
if (etm->synth_opts.timeless_decoding) |
|
return true; |
|
|
|
/* |
|
* Circle through the list of event and complain if we find one |
|
* with the time bit set. |
|
*/ |
|
evlist__for_each_entry(evlist, evsel) { |
|
if ((evsel->core.attr.sample_type & PERF_SAMPLE_TIME)) |
|
timeless_decoding = false; |
|
} |
|
|
|
return timeless_decoding; |
|
} |
|
|
|
static const char * const cs_etm_global_header_fmts[] = { |
|
[CS_HEADER_VERSION] = " Header version %llx\n", |
|
[CS_PMU_TYPE_CPUS] = " PMU type/num cpus %llx\n", |
|
[CS_ETM_SNAPSHOT] = " Snapshot %llx\n", |
|
}; |
|
|
|
static const char * const cs_etm_priv_fmts[] = { |
|
[CS_ETM_MAGIC] = " Magic number %llx\n", |
|
[CS_ETM_CPU] = " CPU %lld\n", |
|
[CS_ETM_NR_TRC_PARAMS] = " NR_TRC_PARAMS %llx\n", |
|
[CS_ETM_ETMCR] = " ETMCR %llx\n", |
|
[CS_ETM_ETMTRACEIDR] = " ETMTRACEIDR %llx\n", |
|
[CS_ETM_ETMCCER] = " ETMCCER %llx\n", |
|
[CS_ETM_ETMIDR] = " ETMIDR %llx\n", |
|
}; |
|
|
|
static const char * const cs_etmv4_priv_fmts[] = { |
|
[CS_ETM_MAGIC] = " Magic number %llx\n", |
|
[CS_ETM_CPU] = " CPU %lld\n", |
|
[CS_ETM_NR_TRC_PARAMS] = " NR_TRC_PARAMS %llx\n", |
|
[CS_ETMV4_TRCCONFIGR] = " TRCCONFIGR %llx\n", |
|
[CS_ETMV4_TRCTRACEIDR] = " TRCTRACEIDR %llx\n", |
|
[CS_ETMV4_TRCIDR0] = " TRCIDR0 %llx\n", |
|
[CS_ETMV4_TRCIDR1] = " TRCIDR1 %llx\n", |
|
[CS_ETMV4_TRCIDR2] = " TRCIDR2 %llx\n", |
|
[CS_ETMV4_TRCIDR8] = " TRCIDR8 %llx\n", |
|
[CS_ETMV4_TRCAUTHSTATUS] = " TRCAUTHSTATUS %llx\n", |
|
[CS_ETE_TRCDEVARCH] = " TRCDEVARCH %llx\n" |
|
}; |
|
|
|
static const char * const param_unk_fmt = |
|
" Unknown parameter [%d] %llx\n"; |
|
static const char * const magic_unk_fmt = |
|
" Magic number Unknown %llx\n"; |
|
|
|
static int cs_etm__print_cpu_metadata_v0(__u64 *val, int *offset) |
|
{ |
|
int i = *offset, j, nr_params = 0, fmt_offset; |
|
__u64 magic; |
|
|
|
/* check magic value */ |
|
magic = val[i + CS_ETM_MAGIC]; |
|
if ((magic != __perf_cs_etmv3_magic) && |
|
(magic != __perf_cs_etmv4_magic)) { |
|
/* failure - note bad magic value */ |
|
fprintf(stdout, magic_unk_fmt, magic); |
|
return -EINVAL; |
|
} |
|
|
|
/* print common header block */ |
|
fprintf(stdout, cs_etm_priv_fmts[CS_ETM_MAGIC], val[i++]); |
|
fprintf(stdout, cs_etm_priv_fmts[CS_ETM_CPU], val[i++]); |
|
|
|
if (magic == __perf_cs_etmv3_magic) { |
|
nr_params = CS_ETM_NR_TRC_PARAMS_V0; |
|
fmt_offset = CS_ETM_ETMCR; |
|
/* after common block, offset format index past NR_PARAMS */ |
|
for (j = fmt_offset; j < nr_params + fmt_offset; j++, i++) |
|
fprintf(stdout, cs_etm_priv_fmts[j], val[i]); |
|
} else if (magic == __perf_cs_etmv4_magic) { |
|
nr_params = CS_ETMV4_NR_TRC_PARAMS_V0; |
|
fmt_offset = CS_ETMV4_TRCCONFIGR; |
|
/* after common block, offset format index past NR_PARAMS */ |
|
for (j = fmt_offset; j < nr_params + fmt_offset; j++, i++) |
|
fprintf(stdout, cs_etmv4_priv_fmts[j], val[i]); |
|
} |
|
*offset = i; |
|
return 0; |
|
} |
|
|
|
static int cs_etm__print_cpu_metadata_v1(__u64 *val, int *offset) |
|
{ |
|
int i = *offset, j, total_params = 0; |
|
__u64 magic; |
|
|
|
magic = val[i + CS_ETM_MAGIC]; |
|
/* total params to print is NR_PARAMS + common block size for v1 */ |
|
total_params = val[i + CS_ETM_NR_TRC_PARAMS] + CS_ETM_COMMON_BLK_MAX_V1; |
|
|
|
if (magic == __perf_cs_etmv3_magic) { |
|
for (j = 0; j < total_params; j++, i++) { |
|
/* if newer record - could be excess params */ |
|
if (j >= CS_ETM_PRIV_MAX) |
|
fprintf(stdout, param_unk_fmt, j, val[i]); |
|
else |
|
fprintf(stdout, cs_etm_priv_fmts[j], val[i]); |
|
} |
|
} else if (magic == __perf_cs_etmv4_magic || magic == __perf_cs_ete_magic) { |
|
/* |
|
* ETE and ETMv4 can be printed in the same block because the number of parameters |
|
* is saved and they share the list of parameter names. ETE is also only supported |
|
* in V1 files. |
|
*/ |
|
for (j = 0; j < total_params; j++, i++) { |
|
/* if newer record - could be excess params */ |
|
if (j >= CS_ETE_PRIV_MAX) |
|
fprintf(stdout, param_unk_fmt, j, val[i]); |
|
else |
|
fprintf(stdout, cs_etmv4_priv_fmts[j], val[i]); |
|
} |
|
} else { |
|
/* failure - note bad magic value and error out */ |
|
fprintf(stdout, magic_unk_fmt, magic); |
|
return -EINVAL; |
|
} |
|
*offset = i; |
|
return 0; |
|
} |
|
|
|
static void cs_etm__print_auxtrace_info(__u64 *val, int num) |
|
{ |
|
int i, cpu = 0, version, err; |
|
|
|
/* bail out early on bad header version */ |
|
version = val[0]; |
|
if (version > CS_HEADER_CURRENT_VERSION) { |
|
/* failure.. return */ |
|
fprintf(stdout, " Unknown Header Version = %x, ", version); |
|
fprintf(stdout, "Version supported <= %x\n", CS_HEADER_CURRENT_VERSION); |
|
return; |
|
} |
|
|
|
for (i = 0; i < CS_HEADER_VERSION_MAX; i++) |
|
fprintf(stdout, cs_etm_global_header_fmts[i], val[i]); |
|
|
|
for (i = CS_HEADER_VERSION_MAX; cpu < num; cpu++) { |
|
if (version == 0) |
|
err = cs_etm__print_cpu_metadata_v0(val, &i); |
|
else if (version == 1) |
|
err = cs_etm__print_cpu_metadata_v1(val, &i); |
|
if (err) |
|
return; |
|
} |
|
} |
|
|
|
/* |
|
* Read a single cpu parameter block from the auxtrace_info priv block. |
|
* |
|
* For version 1 there is a per cpu nr_params entry. If we are handling |
|
* version 1 file, then there may be less, the same, or more params |
|
* indicated by this value than the compile time number we understand. |
|
* |
|
* For a version 0 info block, there are a fixed number, and we need to |
|
* fill out the nr_param value in the metadata we create. |
|
*/ |
|
static u64 *cs_etm__create_meta_blk(u64 *buff_in, int *buff_in_offset, |
|
int out_blk_size, int nr_params_v0) |
|
{ |
|
u64 *metadata = NULL; |
|
int hdr_version; |
|
int nr_in_params, nr_out_params, nr_cmn_params; |
|
int i, k; |
|
|
|
metadata = zalloc(sizeof(*metadata) * out_blk_size); |
|
if (!metadata) |
|
return NULL; |
|
|
|
/* read block current index & version */ |
|
i = *buff_in_offset; |
|
hdr_version = buff_in[CS_HEADER_VERSION]; |
|
|
|
if (!hdr_version) { |
|
/* read version 0 info block into a version 1 metadata block */ |
|
nr_in_params = nr_params_v0; |
|
metadata[CS_ETM_MAGIC] = buff_in[i + CS_ETM_MAGIC]; |
|
metadata[CS_ETM_CPU] = buff_in[i + CS_ETM_CPU]; |
|
metadata[CS_ETM_NR_TRC_PARAMS] = nr_in_params; |
|
/* remaining block params at offset +1 from source */ |
|
for (k = CS_ETM_COMMON_BLK_MAX_V1 - 1; k < nr_in_params; k++) |
|
metadata[k + 1] = buff_in[i + k]; |
|
/* version 0 has 2 common params */ |
|
nr_cmn_params = 2; |
|
} else { |
|
/* read version 1 info block - input and output nr_params may differ */ |
|
/* version 1 has 3 common params */ |
|
nr_cmn_params = 3; |
|
nr_in_params = buff_in[i + CS_ETM_NR_TRC_PARAMS]; |
|
|
|
/* if input has more params than output - skip excess */ |
|
nr_out_params = nr_in_params + nr_cmn_params; |
|
if (nr_out_params > out_blk_size) |
|
nr_out_params = out_blk_size; |
|
|
|
for (k = CS_ETM_MAGIC; k < nr_out_params; k++) |
|
metadata[k] = buff_in[i + k]; |
|
|
|
/* record the actual nr params we copied */ |
|
metadata[CS_ETM_NR_TRC_PARAMS] = nr_out_params - nr_cmn_params; |
|
} |
|
|
|
/* adjust in offset by number of in params used */ |
|
i += nr_in_params + nr_cmn_params; |
|
*buff_in_offset = i; |
|
return metadata; |
|
} |
|
|
|
/** |
|
* Puts a fragment of an auxtrace buffer into the auxtrace queues based |
|
* on the bounds of aux_event, if it matches with the buffer that's at |
|
* file_offset. |
|
* |
|
* Normally, whole auxtrace buffers would be added to the queue. But we |
|
* want to reset the decoder for every PERF_RECORD_AUX event, and the decoder |
|
* is reset across each buffer, so splitting the buffers up in advance has |
|
* the same effect. |
|
*/ |
|
static int cs_etm__queue_aux_fragment(struct perf_session *session, off_t file_offset, size_t sz, |
|
struct perf_record_aux *aux_event, struct perf_sample *sample) |
|
{ |
|
int err; |
|
char buf[PERF_SAMPLE_MAX_SIZE]; |
|
union perf_event *auxtrace_event_union; |
|
struct perf_record_auxtrace *auxtrace_event; |
|
union perf_event auxtrace_fragment; |
|
__u64 aux_offset, aux_size; |
|
__u32 idx; |
|
bool formatted; |
|
|
|
struct cs_etm_auxtrace *etm = container_of(session->auxtrace, |
|
struct cs_etm_auxtrace, |
|
auxtrace); |
|
|
|
/* |
|
* There should be a PERF_RECORD_AUXTRACE event at the file_offset that we got |
|
* from looping through the auxtrace index. |
|
*/ |
|
err = perf_session__peek_event(session, file_offset, buf, |
|
PERF_SAMPLE_MAX_SIZE, &auxtrace_event_union, NULL); |
|
if (err) |
|
return err; |
|
auxtrace_event = &auxtrace_event_union->auxtrace; |
|
if (auxtrace_event->header.type != PERF_RECORD_AUXTRACE) |
|
return -EINVAL; |
|
|
|
if (auxtrace_event->header.size < sizeof(struct perf_record_auxtrace) || |
|
auxtrace_event->header.size != sz) { |
|
return -EINVAL; |
|
} |
|
|
|
/* |
|
* In per-thread mode, CPU is set to -1, but TID will be set instead. See |
|
* auxtrace_mmap_params__set_idx(). Return 'not found' if neither CPU nor TID match. |
|
*/ |
|
if ((auxtrace_event->cpu == (__u32) -1 && auxtrace_event->tid != sample->tid) || |
|
auxtrace_event->cpu != sample->cpu) |
|
return 1; |
|
|
|
if (aux_event->flags & PERF_AUX_FLAG_OVERWRITE) { |
|
/* |
|
* Clamp size in snapshot mode. The buffer size is clamped in |
|
* __auxtrace_mmap__read() for snapshots, so the aux record size doesn't reflect |
|
* the buffer size. |
|
*/ |
|
aux_size = min(aux_event->aux_size, auxtrace_event->size); |
|
|
|
/* |
|
* In this mode, the head also points to the end of the buffer so aux_offset |
|
* needs to have the size subtracted so it points to the beginning as in normal mode |
|
*/ |
|
aux_offset = aux_event->aux_offset - aux_size; |
|
} else { |
|
aux_size = aux_event->aux_size; |
|
aux_offset = aux_event->aux_offset; |
|
} |
|
|
|
if (aux_offset >= auxtrace_event->offset && |
|
aux_offset + aux_size <= auxtrace_event->offset + auxtrace_event->size) { |
|
/* |
|
* If this AUX event was inside this buffer somewhere, create a new auxtrace event |
|
* based on the sizes of the aux event, and queue that fragment. |
|
*/ |
|
auxtrace_fragment.auxtrace = *auxtrace_event; |
|
auxtrace_fragment.auxtrace.size = aux_size; |
|
auxtrace_fragment.auxtrace.offset = aux_offset; |
|
file_offset += aux_offset - auxtrace_event->offset + auxtrace_event->header.size; |
|
|
|
pr_debug3("CS ETM: Queue buffer size: %#"PRI_lx64" offset: %#"PRI_lx64 |
|
" tid: %d cpu: %d\n", aux_size, aux_offset, sample->tid, sample->cpu); |
|
err = auxtrace_queues__add_event(&etm->queues, session, &auxtrace_fragment, |
|
file_offset, NULL); |
|
if (err) |
|
return err; |
|
|
|
idx = auxtrace_event->idx; |
|
formatted = !(aux_event->flags & PERF_AUX_FLAG_CORESIGHT_FORMAT_RAW); |
|
return cs_etm__setup_queue(etm, &etm->queues.queue_array[idx], |
|
idx, formatted); |
|
} |
|
|
|
/* Wasn't inside this buffer, but there were no parse errors. 1 == 'not found' */ |
|
return 1; |
|
} |
|
|
|
static int cs_etm__queue_aux_records_cb(struct perf_session *session, union perf_event *event, |
|
u64 offset __maybe_unused, void *data __maybe_unused) |
|
{ |
|
struct perf_sample sample; |
|
int ret; |
|
struct auxtrace_index_entry *ent; |
|
struct auxtrace_index *auxtrace_index; |
|
struct evsel *evsel; |
|
size_t i; |
|
|
|
/* Don't care about any other events, we're only queuing buffers for AUX events */ |
|
if (event->header.type != PERF_RECORD_AUX) |
|
return 0; |
|
|
|
if (event->header.size < sizeof(struct perf_record_aux)) |
|
return -EINVAL; |
|
|
|
/* Truncated Aux records can have 0 size and shouldn't result in anything being queued. */ |
|
if (!event->aux.aux_size) |
|
return 0; |
|
|
|
/* |
|
* Parse the sample, we need the sample_id_all data that comes after the event so that the |
|
* CPU or PID can be matched to an AUXTRACE buffer's CPU or PID. |
|
*/ |
|
evsel = evlist__event2evsel(session->evlist, event); |
|
if (!evsel) |
|
return -EINVAL; |
|
ret = evsel__parse_sample(evsel, event, &sample); |
|
if (ret) |
|
return ret; |
|
|
|
/* |
|
* Loop through the auxtrace index to find the buffer that matches up with this aux event. |
|
*/ |
|
list_for_each_entry(auxtrace_index, &session->auxtrace_index, list) { |
|
for (i = 0; i < auxtrace_index->nr; i++) { |
|
ent = &auxtrace_index->entries[i]; |
|
ret = cs_etm__queue_aux_fragment(session, ent->file_offset, |
|
ent->sz, &event->aux, &sample); |
|
/* |
|
* Stop search on error or successful values. Continue search on |
|
* 1 ('not found') |
|
*/ |
|
if (ret != 1) |
|
return ret; |
|
} |
|
} |
|
|
|
/* |
|
* Couldn't find the buffer corresponding to this aux record, something went wrong. Warn but |
|
* don't exit with an error because it will still be possible to decode other aux records. |
|
*/ |
|
pr_err("CS ETM: Couldn't find auxtrace buffer for aux_offset: %#"PRI_lx64 |
|
" tid: %d cpu: %d\n", event->aux.aux_offset, sample.tid, sample.cpu); |
|
return 0; |
|
} |
|
|
|
static int cs_etm__queue_aux_records(struct perf_session *session) |
|
{ |
|
struct auxtrace_index *index = list_first_entry_or_null(&session->auxtrace_index, |
|
struct auxtrace_index, list); |
|
if (index && index->nr > 0) |
|
return perf_session__peek_events(session, session->header.data_offset, |
|
session->header.data_size, |
|
cs_etm__queue_aux_records_cb, NULL); |
|
|
|
/* |
|
* We would get here if there are no entries in the index (either no auxtrace |
|
* buffers or no index at all). Fail silently as there is the possibility of |
|
* queueing them in cs_etm__process_auxtrace_event() if etm->data_queued is still |
|
* false. |
|
* |
|
* In that scenario, buffers will not be split by AUX records. |
|
*/ |
|
return 0; |
|
} |
|
|
|
int cs_etm__process_auxtrace_info(union perf_event *event, |
|
struct perf_session *session) |
|
{ |
|
struct perf_record_auxtrace_info *auxtrace_info = &event->auxtrace_info; |
|
struct cs_etm_auxtrace *etm = NULL; |
|
struct int_node *inode; |
|
unsigned int pmu_type; |
|
int event_header_size = sizeof(struct perf_event_header); |
|
int info_header_size; |
|
int total_size = auxtrace_info->header.size; |
|
int priv_size = 0; |
|
int num_cpu, trcidr_idx; |
|
int err = 0; |
|
int i, j; |
|
u64 *ptr, *hdr = NULL; |
|
u64 **metadata = NULL; |
|
u64 hdr_version; |
|
|
|
/* |
|
* sizeof(auxtrace_info_event::type) + |
|
* sizeof(auxtrace_info_event::reserved) == 8 |
|
*/ |
|
info_header_size = 8; |
|
|
|
if (total_size < (event_header_size + info_header_size)) |
|
return -EINVAL; |
|
|
|
priv_size = total_size - event_header_size - info_header_size; |
|
|
|
/* First the global part */ |
|
ptr = (u64 *) auxtrace_info->priv; |
|
|
|
/* Look for version of the header */ |
|
hdr_version = ptr[0]; |
|
if (hdr_version > CS_HEADER_CURRENT_VERSION) { |
|
/* print routine will print an error on bad version */ |
|
if (dump_trace) |
|
cs_etm__print_auxtrace_info(auxtrace_info->priv, 0); |
|
return -EINVAL; |
|
} |
|
|
|
hdr = zalloc(sizeof(*hdr) * CS_HEADER_VERSION_MAX); |
|
if (!hdr) |
|
return -ENOMEM; |
|
|
|
/* Extract header information - see cs-etm.h for format */ |
|
for (i = 0; i < CS_HEADER_VERSION_MAX; i++) |
|
hdr[i] = ptr[i]; |
|
num_cpu = hdr[CS_PMU_TYPE_CPUS] & 0xffffffff; |
|
pmu_type = (unsigned int) ((hdr[CS_PMU_TYPE_CPUS] >> 32) & |
|
0xffffffff); |
|
|
|
/* |
|
* Create an RB tree for traceID-metadata tuple. Since the conversion |
|
* has to be made for each packet that gets decoded, optimizing access |
|
* in anything other than a sequential array is worth doing. |
|
*/ |
|
traceid_list = intlist__new(NULL); |
|
if (!traceid_list) { |
|
err = -ENOMEM; |
|
goto err_free_hdr; |
|
} |
|
|
|
metadata = zalloc(sizeof(*metadata) * num_cpu); |
|
if (!metadata) { |
|
err = -ENOMEM; |
|
goto err_free_traceid_list; |
|
} |
|
|
|
/* |
|
* The metadata is stored in the auxtrace_info section and encodes |
|
* the configuration of the ARM embedded trace macrocell which is |
|
* required by the trace decoder to properly decode the trace due |
|
* to its highly compressed nature. |
|
*/ |
|
for (j = 0; j < num_cpu; j++) { |
|
if (ptr[i] == __perf_cs_etmv3_magic) { |
|
metadata[j] = |
|
cs_etm__create_meta_blk(ptr, &i, |
|
CS_ETM_PRIV_MAX, |
|
CS_ETM_NR_TRC_PARAMS_V0); |
|
|
|
/* The traceID is our handle */ |
|
trcidr_idx = CS_ETM_ETMTRACEIDR; |
|
|
|
} else if (ptr[i] == __perf_cs_etmv4_magic) { |
|
metadata[j] = |
|
cs_etm__create_meta_blk(ptr, &i, |
|
CS_ETMV4_PRIV_MAX, |
|
CS_ETMV4_NR_TRC_PARAMS_V0); |
|
|
|
/* The traceID is our handle */ |
|
trcidr_idx = CS_ETMV4_TRCTRACEIDR; |
|
} else if (ptr[i] == __perf_cs_ete_magic) { |
|
metadata[j] = cs_etm__create_meta_blk(ptr, &i, CS_ETE_PRIV_MAX, -1); |
|
|
|
/* ETE shares first part of metadata with ETMv4 */ |
|
trcidr_idx = CS_ETMV4_TRCTRACEIDR; |
|
} else { |
|
ui__error("CS ETM Trace: Unrecognised magic number %#"PRIx64". File could be from a newer version of perf.\n", |
|
ptr[i]); |
|
err = -EINVAL; |
|
goto err_free_metadata; |
|
} |
|
|
|
if (!metadata[j]) { |
|
err = -ENOMEM; |
|
goto err_free_metadata; |
|
} |
|
|
|
/* Get an RB node for this CPU */ |
|
inode = intlist__findnew(traceid_list, metadata[j][trcidr_idx]); |
|
|
|
/* Something went wrong, no need to continue */ |
|
if (!inode) { |
|
err = -ENOMEM; |
|
goto err_free_metadata; |
|
} |
|
|
|
/* |
|
* The node for that CPU should not be taken. |
|
* Back out if that's the case. |
|
*/ |
|
if (inode->priv) { |
|
err = -EINVAL; |
|
goto err_free_metadata; |
|
} |
|
/* All good, associate the traceID with the metadata pointer */ |
|
inode->priv = metadata[j]; |
|
} |
|
|
|
/* |
|
* Each of CS_HEADER_VERSION_MAX, CS_ETM_PRIV_MAX and |
|
* CS_ETMV4_PRIV_MAX mark how many double words are in the |
|
* global metadata, and each cpu's metadata respectively. |
|
* The following tests if the correct number of double words was |
|
* present in the auxtrace info section. |
|
*/ |
|
if (i * 8 != priv_size) { |
|
err = -EINVAL; |
|
goto err_free_metadata; |
|
} |
|
|
|
etm = zalloc(sizeof(*etm)); |
|
|
|
if (!etm) { |
|
err = -ENOMEM; |
|
goto err_free_metadata; |
|
} |
|
|
|
err = auxtrace_queues__init(&etm->queues); |
|
if (err) |
|
goto err_free_etm; |
|
|
|
if (session->itrace_synth_opts->set) { |
|
etm->synth_opts = *session->itrace_synth_opts; |
|
} else { |
|
itrace_synth_opts__set_default(&etm->synth_opts, |
|
session->itrace_synth_opts->default_no_sample); |
|
etm->synth_opts.callchain = false; |
|
} |
|
|
|
etm->session = session; |
|
etm->machine = &session->machines.host; |
|
|
|
etm->num_cpu = num_cpu; |
|
etm->pmu_type = pmu_type; |
|
etm->snapshot_mode = (hdr[CS_ETM_SNAPSHOT] != 0); |
|
etm->metadata = metadata; |
|
etm->auxtrace_type = auxtrace_info->type; |
|
etm->timeless_decoding = cs_etm__is_timeless_decoding(etm); |
|
|
|
etm->auxtrace.process_event = cs_etm__process_event; |
|
etm->auxtrace.process_auxtrace_event = cs_etm__process_auxtrace_event; |
|
etm->auxtrace.flush_events = cs_etm__flush_events; |
|
etm->auxtrace.free_events = cs_etm__free_events; |
|
etm->auxtrace.free = cs_etm__free; |
|
etm->auxtrace.evsel_is_auxtrace = cs_etm__evsel_is_auxtrace; |
|
session->auxtrace = &etm->auxtrace; |
|
|
|
etm->unknown_thread = thread__new(999999999, 999999999); |
|
if (!etm->unknown_thread) { |
|
err = -ENOMEM; |
|
goto err_free_queues; |
|
} |
|
|
|
/* |
|
* Initialize list node so that at thread__zput() we can avoid |
|
* segmentation fault at list_del_init(). |
|
*/ |
|
INIT_LIST_HEAD(&etm->unknown_thread->node); |
|
|
|
err = thread__set_comm(etm->unknown_thread, "unknown", 0); |
|
if (err) |
|
goto err_delete_thread; |
|
|
|
if (thread__init_maps(etm->unknown_thread, etm->machine)) { |
|
err = -ENOMEM; |
|
goto err_delete_thread; |
|
} |
|
|
|
if (dump_trace) { |
|
cs_etm__print_auxtrace_info(auxtrace_info->priv, num_cpu); |
|
} |
|
|
|
err = cs_etm__synth_events(etm, session); |
|
if (err) |
|
goto err_delete_thread; |
|
|
|
err = cs_etm__queue_aux_records(session); |
|
if (err) |
|
goto err_delete_thread; |
|
|
|
etm->data_queued = etm->queues.populated; |
|
/* |
|
* Print warning in pipe mode, see cs_etm__process_auxtrace_event() and |
|
* cs_etm__queue_aux_fragment() for details relating to limitations. |
|
*/ |
|
if (!etm->data_queued) |
|
pr_warning("CS ETM warning: Coresight decode and TRBE support requires random file access.\n" |
|
"Continuing with best effort decoding in piped mode.\n\n"); |
|
|
|
return 0; |
|
|
|
err_delete_thread: |
|
thread__zput(etm->unknown_thread); |
|
err_free_queues: |
|
auxtrace_queues__free(&etm->queues); |
|
session->auxtrace = NULL; |
|
err_free_etm: |
|
zfree(&etm); |
|
err_free_metadata: |
|
/* No need to check @metadata[j], free(NULL) is supported */ |
|
for (j = 0; j < num_cpu; j++) |
|
zfree(&metadata[j]); |
|
zfree(&metadata); |
|
err_free_traceid_list: |
|
intlist__delete(traceid_list); |
|
err_free_hdr: |
|
zfree(&hdr); |
|
/* |
|
* At this point, as a minimum we have valid header. Dump the rest of |
|
* the info section - the print routines will error out on structural |
|
* issues. |
|
*/ |
|
if (dump_trace) |
|
cs_etm__print_auxtrace_info(auxtrace_info->priv, num_cpu); |
|
return err; |
|
}
|
|
|