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linux-stable-mirror/tools/perf/util/arm-spe-decoder/arm-spe-decoder.c
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James ClarkandArnaldo Carvalho de Melo 8cf4d17ec7 perf arm_spe: Store MIDR in arm_spe_pkt 
The MIDR will affect printing of arm_spe_pkts, so store a copy of it
there. Technically it's constant for each decoder, but there is no
decoder when doing a raw dump, so it has to be stored in every packet.
It will only be used in raw dump mode and not in normal decoding for
now, but to avoid any surprises, set MIDR properly on the decoder too.

Having both the MIDR and the arm_spe_pkt (which has a copy of it) in the
decoder seemed a bit weird, so remove arm_spe_pkt from the decoder. The
packet is only short lived anyway so probably shouldn't have been there
in the first place.

Reviewed-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: James Clark <james.clark@linaro.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.g.garry@oracle.com>
Cc: Leo Yan <leo.yan@linux.dev>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Will Deacon <will@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2026-05-05 22:03:16 -03:00

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// SPDX-License-Identifier: GPL-2.0
/*
* arm_spe_decoder.c: ARM SPE support
*/
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <errno.h>
#include <inttypes.h>
#include <stdbool.h>
#include <string.h>
#include <stdint.h>
#include <stdlib.h>
#include <linux/bitops.h>
#include <linux/compiler.h>
#include <linux/zalloc.h>
#include "../auxtrace.h"
#include "../debug.h"
#include "../util.h"
#include "arm-spe-decoder.h"
static u64 arm_spe_calc_ip(int index, u64 payload)
{
u64 ns, el, val;
/* Instruction virtual address or Branch target address */
if (index == SPE_ADDR_PKT_HDR_INDEX_INS ||
index == SPE_ADDR_PKT_HDR_INDEX_BRANCH ||
index == SPE_ADDR_PKT_HDR_INDEX_PREV_BRANCH) {
ns = SPE_ADDR_PKT_GET_NS(payload);
el = SPE_ADDR_PKT_GET_EL(payload);
/* Clean highest byte */
payload = SPE_ADDR_PKT_ADDR_GET_BYTES_0_6(payload);
/* Fill highest byte for EL1 or EL2 (VHE) mode */
if (ns && (el == SPE_ADDR_PKT_EL1 || el == SPE_ADDR_PKT_EL2))
payload |= 0xffULL << SPE_ADDR_PKT_ADDR_BYTE7_SHIFT;
/* Data access virtual address */
} else if (index == SPE_ADDR_PKT_HDR_INDEX_DATA_VIRT) {
/* Clean tags */
payload = SPE_ADDR_PKT_ADDR_GET_BYTES_0_6(payload);
/*
* Armv8 ARM (ARM DDI 0487F.c), chapter "D10.2.1 Address packet"
* defines the data virtual address payload format, the top byte
* (bits [63:56]) is assigned as top-byte tag; so we only can
* retrieve address value from bits [55:0].
*
* According to Documentation/arch/arm64/memory.rst, if detects the
* specific pattern in bits [55:52] of payload which falls in
* the kernel space, should fixup the top byte and this allows
* perf tool to parse DSO symbol for data address correctly.
*
* For this reason, if detects the bits [55:52] is 0xf, will
* fill 0xff into the top byte.
*/
val = SPE_ADDR_PKT_ADDR_GET_BYTE_6(payload);
if ((val & 0xf0ULL) == 0xf0ULL)
payload |= 0xffULL << SPE_ADDR_PKT_ADDR_BYTE7_SHIFT;
/* Data access physical address */
} else if (index == SPE_ADDR_PKT_HDR_INDEX_DATA_PHYS) {
/* Clean highest byte */
payload = SPE_ADDR_PKT_ADDR_GET_BYTES_0_6(payload);
} else {
static u32 seen_idx = 0;
if (!(seen_idx & BIT(index))) {
seen_idx |= BIT(index);
pr_warning("ignoring unsupported address packet index: 0x%x\n", index);
}
}
return payload;
}
struct arm_spe_decoder *arm_spe_decoder_new(struct arm_spe_params *params)
{
struct arm_spe_decoder *decoder;
if (!params->get_trace)
return NULL;
decoder = zalloc(sizeof(struct arm_spe_decoder));
if (!decoder)
return NULL;
decoder->get_trace = params->get_trace;
decoder->data = params->data;
return decoder;
}
void arm_spe_decoder_free(struct arm_spe_decoder *decoder)
{
free(decoder);
}
static int arm_spe_get_data(struct arm_spe_decoder *decoder)
{
struct arm_spe_buffer buffer = { .buf = 0, };
int ret;
pr_debug("Getting more data\n");
ret = decoder->get_trace(&buffer, decoder->data);
if (ret < 0)
return ret;
decoder->buf = buffer.buf;
decoder->len = buffer.len;
if (!decoder->len)
pr_debug("No more data\n");
return decoder->len;
}
static int arm_spe_get_next_packet(struct arm_spe_decoder *decoder,
struct arm_spe_pkt *packet)
{
int ret;
do {
if (!decoder->len) {
ret = arm_spe_get_data(decoder);
/* Failed to read out trace data */
if (ret <= 0)
return ret;
}
ret = arm_spe_get_packet(decoder->buf, decoder->len,
packet, decoder->midr);
if (ret <= 0) {
/* Move forward for 1 byte */
decoder->buf += 1;
decoder->len -= 1;
return -EBADMSG;
}
decoder->buf += ret;
decoder->len -= ret;
} while (packet->type == ARM_SPE_PAD);
return 1;
}
static int arm_spe_read_record(struct arm_spe_decoder *decoder)
{
int err;
int idx;
u64 payload, ip;
struct arm_spe_pkt packet;
memset(&decoder->record, 0x0, sizeof(decoder->record));
decoder->record.context_id = (u64)-1;
while (1) {
err = arm_spe_get_next_packet(decoder, &packet);
if (err <= 0)
return err;
idx = packet.index;
payload = packet.payload;
switch (packet.type) {
case ARM_SPE_TIMESTAMP:
decoder->record.timestamp = payload;
return 1;
case ARM_SPE_END:
return 1;
case ARM_SPE_ADDRESS:
ip = arm_spe_calc_ip(idx, payload);
if (idx == SPE_ADDR_PKT_HDR_INDEX_INS)
decoder->record.from_ip = ip;
else if (idx == SPE_ADDR_PKT_HDR_INDEX_BRANCH)
decoder->record.to_ip = ip;
else if (idx == SPE_ADDR_PKT_HDR_INDEX_DATA_VIRT)
decoder->record.virt_addr = ip;
else if (idx == SPE_ADDR_PKT_HDR_INDEX_DATA_PHYS)
decoder->record.phys_addr = ip;
else if (idx == SPE_ADDR_PKT_HDR_INDEX_PREV_BRANCH)
decoder->record.prev_br_tgt = ip;
break;
case ARM_SPE_COUNTER:
if (idx == SPE_CNT_PKT_HDR_INDEX_TOTAL_LAT)
decoder->record.latency = payload;
break;
case ARM_SPE_CONTEXT:
decoder->record.context_id = payload;
break;
case ARM_SPE_OP_TYPE:
switch (idx) {
case SPE_OP_PKT_HDR_CLASS_LD_ST_ATOMIC:
decoder->record.op |= ARM_SPE_OP_LDST;
if (payload & SPE_OP_PKT_ST)
decoder->record.op |= ARM_SPE_OP_ST;
else
decoder->record.op |= ARM_SPE_OP_LD;
if (SPE_OP_PKT_LDST_SUBCLASS_GP_REG(payload)) {
decoder->record.op |= ARM_SPE_OP_GP_REG;
} else if (SPE_OP_PKT_LDST_SUBCLASS_SIMD_FP(payload)) {
decoder->record.op |= ARM_SPE_OP_SIMD_FP;
} else if (SPE_OP_PKT_LDST_SUBCLASS_UNSPEC_REG(payload)) {
decoder->record.op |= ARM_SPE_OP_UNSPEC_REG;
} else if (SPE_OP_PKT_LDST_SUBCLASS_NV_SYSREG(payload)) {
decoder->record.op |= ARM_SPE_OP_NV_SYSREG;
} else if (SPE_OP_PKT_LDST_SUBCLASS_MTE_TAG(payload)) {
decoder->record.op |= ARM_SPE_OP_MTE_TAG;
} else if (SPE_OP_PKT_LDST_SUBCLASS_EXTENDED(payload)) {
if (payload & SPE_OP_PKT_AR)
decoder->record.op |= ARM_SPE_OP_AR;
if (payload & SPE_OP_PKT_EXCL)
decoder->record.op |= ARM_SPE_OP_EXCL;
if (payload & SPE_OP_PKT_AT)
decoder->record.op |= ARM_SPE_OP_ATOMIC;
} else if (SPE_OP_PKT_LDST_SUBCLASS_SVE_SME_REG(payload)) {
decoder->record.op |= ARM_SPE_OP_SVE;
if (payload & SPE_OP_PKT_SVE_PRED)
decoder->record.op |= ARM_SPE_OP_PRED;
if (payload & SPE_OP_PKT_SVE_SG)
decoder->record.op |= ARM_SPE_OP_SG;
} else if (SPE_OP_PKT_LDST_SUBCLASS_MEMCPY(payload)) {
decoder->record.op |= ARM_SPE_OP_MEMCPY;
} else if (SPE_OP_PKT_LDST_SUBCLASS_MEMSET(payload)) {
decoder->record.op |= ARM_SPE_OP_MEMSET;
} else if (SPE_OP_PKT_LDST_SUBCLASS_GCS(payload)) {
decoder->record.op |= ARM_SPE_OP_GCS;
if (payload & SPE_OP_PKT_GCS_COMM)
decoder->record.op |= ARM_SPE_OP_COMM;
}
break;
case SPE_OP_PKT_HDR_CLASS_OTHER:
decoder->record.op |= ARM_SPE_OP_OTHER;
if (SPE_OP_PKT_OTHER_SUBCLASS_SVE(payload)) {
decoder->record.op |= ARM_SPE_OP_SVE | ARM_SPE_OP_DP;
if (payload & SPE_OP_PKT_OTHER_FP)
decoder->record.op |= ARM_SPE_OP_FP;
if (payload & SPE_OP_PKT_SVE_PRED)
decoder->record.op |= ARM_SPE_OP_PRED;
} else if (SPE_OP_PKT_OTHER_SUBCLASS_SME(payload)) {
decoder->record.op |= ARM_SPE_OP_SME;
if (payload & SPE_OP_PKT_OTHER_FP)
decoder->record.op |= ARM_SPE_OP_FP;
} else if (SPE_OP_PKT_OTHER_SUBCLASS_OTHER(payload)) {
if (payload & SPE_OP_PKT_OTHER_ASE)
decoder->record.op |= ARM_SPE_OP_ASE;
if (payload & SPE_OP_PKT_OTHER_FP)
decoder->record.op |= ARM_SPE_OP_FP;
if (payload & SPE_OP_PKT_COND)
decoder->record.op |= ARM_SPE_OP_COND;
}
break;
case SPE_OP_PKT_HDR_CLASS_BR_ERET:
decoder->record.op |= ARM_SPE_OP_BRANCH_ERET;
if (payload & SPE_OP_PKT_COND)
decoder->record.op |= ARM_SPE_OP_BR_COND;
if (payload & SPE_OP_PKT_INDIRECT_BRANCH)
decoder->record.op |= ARM_SPE_OP_BR_INDIRECT;
if (payload & SPE_OP_PKT_GCS)
decoder->record.op |= ARM_SPE_OP_BR_GCS;
if (SPE_OP_PKT_CR_BL(payload))
decoder->record.op |= ARM_SPE_OP_BR_CR_BL;
if (SPE_OP_PKT_CR_RET(payload))
decoder->record.op |= ARM_SPE_OP_BR_CR_RET;
if (SPE_OP_PKT_CR_NON_BL_RET(payload))
decoder->record.op |= ARM_SPE_OP_BR_CR_NON_BL_RET;
break;
default:
pr_err("Get packet error!\n");
return -1;
}
break;
case ARM_SPE_EVENTS:
decoder->record.type = payload;
break;
case ARM_SPE_DATA_SOURCE:
decoder->record.source = payload;
break;
case ARM_SPE_BAD:
break;
case ARM_SPE_PAD:
break;
default:
pr_err("Get packet error!\n");
return -1;
}
}
return 0;
}
int arm_spe_decode(struct arm_spe_decoder *decoder)
{
return arm_spe_read_record(decoder);
}
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