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Diffstat (limited to 'tools/perf/util/intel-pt-decoder/intel-pt-decoder.c')
-rw-r--r--tools/perf/util/intel-pt-decoder/intel-pt-decoder.c443
1 files changed, 396 insertions, 47 deletions
diff --git a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
index 9d189e90fbdc..f8b71bf2bb4c 100644
--- a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
+++ b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
@@ -95,6 +95,7 @@ struct intel_pt_decoder {
uint64_t *insn_cnt_ptr, uint64_t *ip, uint64_t to_ip,
uint64_t max_insn_cnt, void *data);
bool (*pgd_ip)(uint64_t ip, void *data);
+ int (*lookahead)(void *data, intel_pt_lookahead_cb_t cb, void *cb_data);
void *data;
struct intel_pt_state state;
const unsigned char *buf;
@@ -107,6 +108,7 @@ struct intel_pt_decoder {
bool have_cyc;
bool fixup_last_mtc;
bool have_last_ip;
+ bool in_psb;
enum intel_pt_param_flags flags;
uint64_t pos;
uint64_t last_ip;
@@ -115,6 +117,7 @@ struct intel_pt_decoder {
uint64_t timestamp;
uint64_t tsc_timestamp;
uint64_t ref_timestamp;
+ uint64_t buf_timestamp;
uint64_t sample_timestamp;
uint64_t ret_addr;
uint64_t ctc_timestamp;
@@ -130,6 +133,10 @@ struct intel_pt_decoder {
int mtc_shift;
struct intel_pt_stack stack;
enum intel_pt_pkt_state pkt_state;
+ enum intel_pt_pkt_ctx pkt_ctx;
+ enum intel_pt_pkt_ctx prev_pkt_ctx;
+ enum intel_pt_blk_type blk_type;
+ int blk_type_pos;
struct intel_pt_pkt packet;
struct intel_pt_pkt tnt;
int pkt_step;
@@ -151,6 +158,11 @@ struct intel_pt_decoder {
uint64_t period_mask;
uint64_t period_ticks;
uint64_t last_masked_timestamp;
+ uint64_t tot_cyc_cnt;
+ uint64_t sample_tot_cyc_cnt;
+ uint64_t base_cyc_cnt;
+ uint64_t cyc_cnt_timestamp;
+ double tsc_to_cyc;
bool continuous_period;
bool overflow;
bool set_fup_tx_flags;
@@ -158,6 +170,8 @@ struct intel_pt_decoder {
bool set_fup_mwait;
bool set_fup_pwre;
bool set_fup_exstop;
+ bool set_fup_bep;
+ bool sample_cyc;
unsigned int fup_tx_flags;
unsigned int tx_flags;
uint64_t fup_ptw_payload;
@@ -217,6 +231,7 @@ struct intel_pt_decoder *intel_pt_decoder_new(struct intel_pt_params *params)
decoder->get_trace = params->get_trace;
decoder->walk_insn = params->walk_insn;
decoder->pgd_ip = params->pgd_ip;
+ decoder->lookahead = params->lookahead;
decoder->data = params->data;
decoder->return_compression = params->return_compression;
decoder->branch_enable = params->branch_enable;
@@ -470,7 +485,21 @@ static int intel_pt_bad_packet(struct intel_pt_decoder *decoder)
return -EBADMSG;
}
-static int intel_pt_get_data(struct intel_pt_decoder *decoder)
+static inline void intel_pt_update_sample_time(struct intel_pt_decoder *decoder)
+{
+ decoder->sample_timestamp = decoder->timestamp;
+ decoder->sample_insn_cnt = decoder->timestamp_insn_cnt;
+}
+
+static void intel_pt_reposition(struct intel_pt_decoder *decoder)
+{
+ decoder->ip = 0;
+ decoder->pkt_state = INTEL_PT_STATE_NO_PSB;
+ decoder->timestamp = 0;
+ decoder->have_tma = false;
+}
+
+static int intel_pt_get_data(struct intel_pt_decoder *decoder, bool reposition)
{
struct intel_pt_buffer buffer = { .buf = 0, };
int ret;
@@ -487,12 +516,10 @@ static int intel_pt_get_data(struct intel_pt_decoder *decoder)
intel_pt_log("No more data\n");
return -ENODATA;
}
- if (!buffer.consecutive) {
- decoder->ip = 0;
- decoder->pkt_state = INTEL_PT_STATE_NO_PSB;
+ decoder->buf_timestamp = buffer.ref_timestamp;
+ if (!buffer.consecutive || reposition) {
+ intel_pt_reposition(decoder);
decoder->ref_timestamp = buffer.ref_timestamp;
- decoder->timestamp = 0;
- decoder->have_tma = false;
decoder->state.trace_nr = buffer.trace_nr;
intel_pt_log("Reference timestamp 0x%" PRIx64 "\n",
decoder->ref_timestamp);
@@ -502,10 +529,11 @@ static int intel_pt_get_data(struct intel_pt_decoder *decoder)
return 0;
}
-static int intel_pt_get_next_data(struct intel_pt_decoder *decoder)
+static int intel_pt_get_next_data(struct intel_pt_decoder *decoder,
+ bool reposition)
{
if (!decoder->next_buf)
- return intel_pt_get_data(decoder);
+ return intel_pt_get_data(decoder, reposition);
decoder->buf = decoder->next_buf;
decoder->len = decoder->next_len;
@@ -524,7 +552,7 @@ static int intel_pt_get_split_packet(struct intel_pt_decoder *decoder)
len = decoder->len;
memcpy(buf, decoder->buf, len);
- ret = intel_pt_get_data(decoder);
+ ret = intel_pt_get_data(decoder, false);
if (ret) {
decoder->pos += old_len;
return ret < 0 ? ret : -EINVAL;
@@ -536,7 +564,8 @@ static int intel_pt_get_split_packet(struct intel_pt_decoder *decoder)
memcpy(buf + len, decoder->buf, n);
len += n;
- ret = intel_pt_get_packet(buf, len, &decoder->packet);
+ decoder->prev_pkt_ctx = decoder->pkt_ctx;
+ ret = intel_pt_get_packet(buf, len, &decoder->packet, &decoder->pkt_ctx);
if (ret < (int)old_len) {
decoder->next_buf = decoder->buf;
decoder->next_len = decoder->len;
@@ -571,6 +600,7 @@ static int intel_pt_pkt_lookahead(struct intel_pt_decoder *decoder,
{
struct intel_pt_pkt_info pkt_info;
const unsigned char *buf = decoder->buf;
+ enum intel_pt_pkt_ctx pkt_ctx = decoder->pkt_ctx;
size_t len = decoder->len;
int ret;
@@ -589,7 +619,8 @@ static int intel_pt_pkt_lookahead(struct intel_pt_decoder *decoder,
if (!len)
return INTEL_PT_NEED_MORE_BYTES;
- ret = intel_pt_get_packet(buf, len, &pkt_info.packet);
+ ret = intel_pt_get_packet(buf, len, &pkt_info.packet,
+ &pkt_ctx);
if (!ret)
return INTEL_PT_NEED_MORE_BYTES;
if (ret < 0)
@@ -664,6 +695,10 @@ static int intel_pt_calc_cyc_cb(struct intel_pt_pkt_info *pkt_info)
case INTEL_PT_MNT:
case INTEL_PT_PTWRITE:
case INTEL_PT_PTWRITE_IP:
+ case INTEL_PT_BBP:
+ case INTEL_PT_BIP:
+ case INTEL_PT_BEP:
+ case INTEL_PT_BEP_IP:
return 0;
case INTEL_PT_MTC:
@@ -850,13 +885,14 @@ static int intel_pt_get_next_packet(struct intel_pt_decoder *decoder)
decoder->len -= decoder->pkt_step;
if (!decoder->len) {
- ret = intel_pt_get_next_data(decoder);
+ ret = intel_pt_get_next_data(decoder, false);
if (ret)
return ret;
}
+ decoder->prev_pkt_ctx = decoder->pkt_ctx;
ret = intel_pt_get_packet(decoder->buf, decoder->len,
- &decoder->packet);
+ &decoder->packet, &decoder->pkt_ctx);
if (ret == INTEL_PT_NEED_MORE_BYTES && BITS_PER_LONG == 32 &&
decoder->len < INTEL_PT_PKT_MAX_SZ && !decoder->next_buf) {
ret = intel_pt_get_split_packet(decoder);
@@ -1094,6 +1130,14 @@ static bool intel_pt_fup_event(struct intel_pt_decoder *decoder)
decoder->state.to_ip = 0;
ret = true;
}
+ if (decoder->set_fup_bep) {
+ decoder->set_fup_bep = false;
+ decoder->state.type |= INTEL_PT_BLK_ITEMS;
+ decoder->state.type &= ~INTEL_PT_BRANCH;
+ decoder->state.from_ip = decoder->ip;
+ decoder->state.to_ip = 0;
+ ret = true;
+ }
return ret;
}
@@ -1308,10 +1352,10 @@ static int intel_pt_walk_tnt(struct intel_pt_decoder *decoder)
decoder->ip += intel_pt_insn.length;
return 0;
}
+ decoder->sample_cyc = false;
decoder->ip += intel_pt_insn.length;
if (!decoder->tnt.count) {
- decoder->sample_timestamp = decoder->timestamp;
- decoder->sample_insn_cnt = decoder->timestamp_insn_cnt;
+ intel_pt_update_sample_time(decoder);
return -EAGAIN;
}
decoder->tnt.payload <<= 1;
@@ -1345,6 +1389,21 @@ static int intel_pt_mode_tsx(struct intel_pt_decoder *decoder, bool *no_tip)
return 0;
}
+static uint64_t intel_pt_8b_tsc(uint64_t timestamp, uint64_t ref_timestamp)
+{
+ timestamp |= (ref_timestamp & (0xffULL << 56));
+
+ if (timestamp < ref_timestamp) {
+ if (ref_timestamp - timestamp > (1ULL << 55))
+ timestamp += (1ULL << 56);
+ } else {
+ if (timestamp - ref_timestamp > (1ULL << 55))
+ timestamp -= (1ULL << 56);
+ }
+
+ return timestamp;
+}
+
static void intel_pt_calc_tsc_timestamp(struct intel_pt_decoder *decoder)
{
uint64_t timestamp;
@@ -1352,15 +1411,8 @@ static void intel_pt_calc_tsc_timestamp(struct intel_pt_decoder *decoder)
decoder->have_tma = false;
if (decoder->ref_timestamp) {
- timestamp = decoder->packet.payload |
- (decoder->ref_timestamp & (0xffULL << 56));
- if (timestamp < decoder->ref_timestamp) {
- if (decoder->ref_timestamp - timestamp > (1ULL << 55))
- timestamp += (1ULL << 56);
- } else {
- if (timestamp - decoder->ref_timestamp > (1ULL << 55))
- timestamp -= (1ULL << 56);
- }
+ timestamp = intel_pt_8b_tsc(decoder->packet.payload,
+ decoder->ref_timestamp);
decoder->tsc_timestamp = timestamp;
decoder->timestamp = timestamp;
decoder->ref_timestamp = 0;
@@ -1404,6 +1456,42 @@ static int intel_pt_overflow(struct intel_pt_decoder *decoder)
return -EOVERFLOW;
}
+static inline void intel_pt_mtc_cyc_cnt_pge(struct intel_pt_decoder *decoder)
+{
+ if (decoder->have_cyc)
+ return;
+
+ decoder->cyc_cnt_timestamp = decoder->timestamp;
+ decoder->base_cyc_cnt = decoder->tot_cyc_cnt;
+}
+
+static inline void intel_pt_mtc_cyc_cnt_cbr(struct intel_pt_decoder *decoder)
+{
+ decoder->tsc_to_cyc = decoder->cbr / decoder->max_non_turbo_ratio_fp;
+
+ if (decoder->pge)
+ intel_pt_mtc_cyc_cnt_pge(decoder);
+}
+
+static inline void intel_pt_mtc_cyc_cnt_upd(struct intel_pt_decoder *decoder)
+{
+ uint64_t tot_cyc_cnt, tsc_delta;
+
+ if (decoder->have_cyc)
+ return;
+
+ decoder->sample_cyc = true;
+
+ if (!decoder->pge || decoder->timestamp <= decoder->cyc_cnt_timestamp)
+ return;
+
+ tsc_delta = decoder->timestamp - decoder->cyc_cnt_timestamp;
+ tot_cyc_cnt = tsc_delta * decoder->tsc_to_cyc + decoder->base_cyc_cnt;
+
+ if (tot_cyc_cnt > decoder->tot_cyc_cnt)
+ decoder->tot_cyc_cnt = tot_cyc_cnt;
+}
+
static void intel_pt_calc_tma(struct intel_pt_decoder *decoder)
{
uint32_t ctc = decoder->packet.payload;
@@ -1413,6 +1501,11 @@ static void intel_pt_calc_tma(struct intel_pt_decoder *decoder)
if (!decoder->tsc_ctc_ratio_d)
return;
+ if (decoder->pge && !decoder->in_psb)
+ intel_pt_mtc_cyc_cnt_pge(decoder);
+ else
+ intel_pt_mtc_cyc_cnt_upd(decoder);
+
decoder->last_mtc = (ctc >> decoder->mtc_shift) & 0xff;
decoder->ctc_timestamp = decoder->tsc_timestamp - fc;
if (decoder->tsc_ctc_mult) {
@@ -1468,6 +1561,8 @@ static void intel_pt_calc_mtc_timestamp(struct intel_pt_decoder *decoder)
else
decoder->timestamp = timestamp;
+ intel_pt_mtc_cyc_cnt_upd(decoder);
+
decoder->timestamp_insn_cnt = 0;
decoder->last_mtc = mtc;
@@ -1492,6 +1587,8 @@ static void intel_pt_calc_cbr(struct intel_pt_decoder *decoder)
decoder->cbr = cbr;
decoder->cbr_cyc_to_tsc = decoder->max_non_turbo_ratio_fp / cbr;
+
+ intel_pt_mtc_cyc_cnt_cbr(decoder);
}
static void intel_pt_calc_cyc_timestamp(struct intel_pt_decoder *decoder)
@@ -1501,6 +1598,9 @@ static void intel_pt_calc_cyc_timestamp(struct intel_pt_decoder *decoder)
decoder->have_cyc = true;
decoder->cycle_cnt += decoder->packet.payload;
+ if (decoder->pge)
+ decoder->tot_cyc_cnt += decoder->packet.payload;
+ decoder->sample_cyc = true;
if (!decoder->cyc_ref_timestamp)
return;
@@ -1523,19 +1623,62 @@ static void intel_pt_calc_cyc_timestamp(struct intel_pt_decoder *decoder)
intel_pt_log_to("Setting timestamp", decoder->timestamp);
}
+static void intel_pt_bbp(struct intel_pt_decoder *decoder)
+{
+ if (decoder->prev_pkt_ctx == INTEL_PT_NO_CTX) {
+ memset(decoder->state.items.mask, 0, sizeof(decoder->state.items.mask));
+ decoder->state.items.is_32_bit = false;
+ }
+ decoder->blk_type = decoder->packet.payload;
+ decoder->blk_type_pos = intel_pt_blk_type_pos(decoder->blk_type);
+ if (decoder->blk_type == INTEL_PT_GP_REGS)
+ decoder->state.items.is_32_bit = decoder->packet.count;
+ if (decoder->blk_type_pos < 0) {
+ intel_pt_log("WARNING: Unknown block type %u\n",
+ decoder->blk_type);
+ } else if (decoder->state.items.mask[decoder->blk_type_pos]) {
+ intel_pt_log("WARNING: Duplicate block type %u\n",
+ decoder->blk_type);
+ }
+}
+
+static void intel_pt_bip(struct intel_pt_decoder *decoder)
+{
+ uint32_t id = decoder->packet.count;
+ uint32_t bit = 1 << id;
+ int pos = decoder->blk_type_pos;
+
+ if (pos < 0 || id >= INTEL_PT_BLK_ITEM_ID_CNT) {
+ intel_pt_log("WARNING: Unknown block item %u type %d\n",
+ id, decoder->blk_type);
+ return;
+ }
+
+ if (decoder->state.items.mask[pos] & bit) {
+ intel_pt_log("WARNING: Duplicate block item %u type %d\n",
+ id, decoder->blk_type);
+ }
+
+ decoder->state.items.mask[pos] |= bit;
+ decoder->state.items.val[pos][id] = decoder->packet.payload;
+}
+
/* Walk PSB+ packets when already in sync. */
static int intel_pt_walk_psbend(struct intel_pt_decoder *decoder)
{
int err;
+ decoder->in_psb = true;
+
while (1) {
err = intel_pt_get_next_packet(decoder);
if (err)
- return err;
+ goto out;
switch (decoder->packet.type) {
case INTEL_PT_PSBEND:
- return 0;
+ err = 0;
+ goto out;
case INTEL_PT_TIP_PGD:
case INTEL_PT_TIP_PGE:
@@ -1551,12 +1694,18 @@ static int intel_pt_walk_psbend(struct intel_pt_decoder *decoder)
case INTEL_PT_MWAIT:
case INTEL_PT_PWRE:
case INTEL_PT_PWRX:
+ case INTEL_PT_BBP:
+ case INTEL_PT_BIP:
+ case INTEL_PT_BEP:
+ case INTEL_PT_BEP_IP:
decoder->have_tma = false;
intel_pt_log("ERROR: Unexpected packet\n");
- return -EAGAIN;
+ err = -EAGAIN;
+ goto out;
case INTEL_PT_OVF:
- return intel_pt_overflow(decoder);
+ err = intel_pt_overflow(decoder);
+ goto out;
case INTEL_PT_TSC:
intel_pt_calc_tsc_timestamp(decoder);
@@ -1602,6 +1751,10 @@ static int intel_pt_walk_psbend(struct intel_pt_decoder *decoder)
break;
}
}
+out:
+ decoder->in_psb = false;
+
+ return err;
}
static int intel_pt_walk_fup_tip(struct intel_pt_decoder *decoder)
@@ -1638,6 +1791,10 @@ static int intel_pt_walk_fup_tip(struct intel_pt_decoder *decoder)
case INTEL_PT_MWAIT:
case INTEL_PT_PWRE:
case INTEL_PT_PWRX:
+ case INTEL_PT_BBP:
+ case INTEL_PT_BIP:
+ case INTEL_PT_BEP:
+ case INTEL_PT_BEP_IP:
intel_pt_log("ERROR: Missing TIP after FUP\n");
decoder->pkt_state = INTEL_PT_STATE_ERR3;
decoder->pkt_step = 0;
@@ -1675,6 +1832,7 @@ static int intel_pt_walk_fup_tip(struct intel_pt_decoder *decoder)
decoder->state.to_ip = decoder->ip;
}
decoder->state.type |= INTEL_PT_TRACE_BEGIN;
+ intel_pt_mtc_cyc_cnt_pge(decoder);
return 0;
case INTEL_PT_TIP:
@@ -1745,6 +1903,7 @@ next:
case INTEL_PT_TIP_PGE: {
decoder->pge = true;
+ intel_pt_mtc_cyc_cnt_pge(decoder);
if (decoder->packet.count == 0) {
intel_pt_log_at("Skipping zero TIP.PGE",
decoder->pos);
@@ -1957,6 +2116,33 @@ next:
decoder->state.pwrx_payload = decoder->packet.payload;
return 0;
+ case INTEL_PT_BBP:
+ intel_pt_bbp(decoder);
+ break;
+
+ case INTEL_PT_BIP:
+ intel_pt_bip(decoder);
+ break;
+
+ case INTEL_PT_BEP:
+ decoder->state.type = INTEL_PT_BLK_ITEMS;
+ decoder->state.from_ip = decoder->ip;
+ decoder->state.to_ip = 0;
+ return 0;
+
+ case INTEL_PT_BEP_IP:
+ err = intel_pt_get_next_packet(decoder);
+ if (err)
+ return err;
+ if (decoder->packet.type == INTEL_PT_FUP) {
+ decoder->set_fup_bep = true;
+ no_tip = true;
+ } else {
+ intel_pt_log_at("ERROR: Missing FUP after BEP",
+ decoder->pos);
+ }
+ goto next;
+
default:
return intel_pt_bug(decoder);
}
@@ -1975,10 +2161,12 @@ static int intel_pt_walk_psb(struct intel_pt_decoder *decoder)
{
int err;
+ decoder->in_psb = true;
+
while (1) {
err = intel_pt_get_next_packet(decoder);
if (err)
- return err;
+ goto out;
switch (decoder->packet.type) {
case INTEL_PT_TIP_PGD:
@@ -1993,8 +2181,13 @@ static int intel_pt_walk_psb(struct intel_pt_decoder *decoder)
case INTEL_PT_MWAIT:
case INTEL_PT_PWRE:
case INTEL_PT_PWRX:
+ case INTEL_PT_BBP:
+ case INTEL_PT_BIP:
+ case INTEL_PT_BEP:
+ case INTEL_PT_BEP_IP:
intel_pt_log("ERROR: Unexpected packet\n");
- return -ENOENT;
+ err = -ENOENT;
+ goto out;
case INTEL_PT_FUP:
decoder->pge = true;
@@ -2053,16 +2246,20 @@ static int intel_pt_walk_psb(struct intel_pt_decoder *decoder)
decoder->pkt_state = INTEL_PT_STATE_ERR4;
else
decoder->pkt_state = INTEL_PT_STATE_ERR3;
- return -ENOENT;
+ err = -ENOENT;
+ goto out;
case INTEL_PT_BAD: /* Does not happen */
- return intel_pt_bug(decoder);
+ err = intel_pt_bug(decoder);
+ goto out;
case INTEL_PT_OVF:
- return intel_pt_overflow(decoder);
+ err = intel_pt_overflow(decoder);
+ goto out;
case INTEL_PT_PSBEND:
- return 0;
+ err = 0;
+ goto out;
case INTEL_PT_PSB:
case INTEL_PT_VMCS:
@@ -2072,6 +2269,10 @@ static int intel_pt_walk_psb(struct intel_pt_decoder *decoder)
break;
}
}
+out:
+ decoder->in_psb = false;
+
+ return err;
}
static int intel_pt_walk_to_ip(struct intel_pt_decoder *decoder)
@@ -2086,18 +2287,30 @@ static int intel_pt_walk_to_ip(struct intel_pt_decoder *decoder)
switch (decoder->packet.type) {
case INTEL_PT_TIP_PGD:
decoder->continuous_period = false;
- __fallthrough;
+ decoder->pge = false;
+ if (intel_pt_have_ip(decoder))
+ intel_pt_set_ip(decoder);
+ if (!decoder->ip)
+ break;
+ decoder->state.type |= INTEL_PT_TRACE_END;
+ return 0;
+
case INTEL_PT_TIP_PGE:
+ decoder->pge = true;
+ intel_pt_mtc_cyc_cnt_pge(decoder);
+ if (intel_pt_have_ip(decoder))
+ intel_pt_set_ip(decoder);
+ if (!decoder->ip)
+ break;
+ decoder->state.type |= INTEL_PT_TRACE_BEGIN;
+ return 0;
+
case INTEL_PT_TIP:
- decoder->pge = decoder->packet.type != INTEL_PT_TIP_PGD;
+ decoder->pge = true;
if (intel_pt_have_ip(decoder))
intel_pt_set_ip(decoder);
if (!decoder->ip)
break;
- if (decoder->packet.type == INTEL_PT_TIP_PGE)
- decoder->state.type |= INTEL_PT_TRACE_BEGIN;
- if (decoder->packet.type == INTEL_PT_TIP_PGD)
- decoder->state.type |= INTEL_PT_TRACE_END;
return 0;
case INTEL_PT_FUP:
@@ -2178,6 +2391,10 @@ static int intel_pt_walk_to_ip(struct intel_pt_decoder *decoder)
case INTEL_PT_MWAIT:
case INTEL_PT_PWRE:
case INTEL_PT_PWRX:
+ case INTEL_PT_BBP:
+ case INTEL_PT_BIP:
+ case INTEL_PT_BEP:
+ case INTEL_PT_BEP_IP:
default:
break;
}
@@ -2193,6 +2410,7 @@ static int intel_pt_sync_ip(struct intel_pt_decoder *decoder)
decoder->set_fup_mwait = false;
decoder->set_fup_pwre = false;
decoder->set_fup_exstop = false;
+ decoder->set_fup_bep = false;
if (!decoder->branch_enable) {
decoder->pkt_state = INTEL_PT_STATE_IN_SYNC;
@@ -2250,7 +2468,7 @@ static int intel_pt_get_split_psb(struct intel_pt_decoder *decoder,
decoder->pos += decoder->len;
decoder->len = 0;
- ret = intel_pt_get_next_data(decoder);
+ ret = intel_pt_get_next_data(decoder, false);
if (ret)
return ret;
@@ -2276,7 +2494,7 @@ static int intel_pt_scan_for_psb(struct intel_pt_decoder *decoder)
intel_pt_log("Scanning for PSB\n");
while (1) {
if (!decoder->len) {
- ret = intel_pt_get_next_data(decoder);
+ ret = intel_pt_get_next_data(decoder, false);
if (ret)
return ret;
}
@@ -2404,8 +2622,8 @@ const struct intel_pt_state *intel_pt_decode(struct intel_pt_decoder *decoder)
if (err) {
decoder->state.err = intel_pt_ext_err(err);
decoder->state.from_ip = decoder->ip;
- decoder->sample_timestamp = decoder->timestamp;
- decoder->sample_insn_cnt = decoder->timestamp_insn_cnt;
+ intel_pt_update_sample_time(decoder);
+ decoder->sample_tot_cyc_cnt = decoder->tot_cyc_cnt;
} else {
decoder->state.err = 0;
if (decoder->cbr != decoder->cbr_seen && decoder->state.type) {
@@ -2414,8 +2632,9 @@ const struct intel_pt_state *intel_pt_decode(struct intel_pt_decoder *decoder)
decoder->state.cbr_payload = decoder->cbr_payload;
}
if (intel_pt_sample_time(decoder->pkt_state)) {
- decoder->sample_timestamp = decoder->timestamp;
- decoder->sample_insn_cnt = decoder->timestamp_insn_cnt;
+ intel_pt_update_sample_time(decoder);
+ if (decoder->sample_cyc)
+ decoder->sample_tot_cyc_cnt = decoder->tot_cyc_cnt;
}
}
@@ -2423,6 +2642,7 @@ const struct intel_pt_state *intel_pt_decode(struct intel_pt_decoder *decoder)
decoder->state.est_timestamp = intel_pt_est_timestamp(decoder);
decoder->state.cr3 = decoder->cr3;
decoder->state.tot_insn_cnt = decoder->tot_insn_cnt;
+ decoder->state.tot_cyc_cnt = decoder->sample_tot_cyc_cnt;
return &decoder->state;
}
@@ -2526,11 +2746,12 @@ static unsigned char *intel_pt_last_psb(unsigned char *buf, size_t len)
static bool intel_pt_next_tsc(unsigned char *buf, size_t len, uint64_t *tsc,
size_t *rem)
{
+ enum intel_pt_pkt_ctx ctx = INTEL_PT_NO_CTX;
struct intel_pt_pkt packet;
int ret;
while (len) {
- ret = intel_pt_get_packet(buf, len, &packet);
+ ret = intel_pt_get_packet(buf, len, &packet, &ctx);
if (ret <= 0)
return false;
if (packet.type == INTEL_PT_TSC) {
@@ -2732,3 +2953,131 @@ unsigned char *intel_pt_find_overlap(unsigned char *buf_a, size_t len_a,
return buf_b; /* No overlap */
}
}
+
+/**
+ * struct fast_forward_data - data used by intel_pt_ff_cb().
+ * @timestamp: timestamp to fast forward towards
+ * @buf_timestamp: buffer timestamp of last buffer with trace data earlier than
+ * the fast forward timestamp.
+ */
+struct fast_forward_data {
+ uint64_t timestamp;
+ uint64_t buf_timestamp;
+};
+
+/**
+ * intel_pt_ff_cb - fast forward lookahead callback.
+ * @buffer: Intel PT trace buffer
+ * @data: opaque pointer to fast forward data (struct fast_forward_data)
+ *
+ * Determine if @buffer trace is past the fast forward timestamp.
+ *
+ * Return: 1 (stop lookahead) if @buffer trace is past the fast forward
+ * timestamp, and 0 otherwise.
+ */
+static int intel_pt_ff_cb(struct intel_pt_buffer *buffer, void *data)
+{
+ struct fast_forward_data *d = data;
+ unsigned char *buf;
+ uint64_t tsc;
+ size_t rem;
+ size_t len;
+
+ buf = (unsigned char *)buffer->buf;
+ len = buffer->len;
+
+ if (!intel_pt_next_psb(&buf, &len) ||
+ !intel_pt_next_tsc(buf, len, &tsc, &rem))
+ return 0;
+
+ tsc = intel_pt_8b_tsc(tsc, buffer->ref_timestamp);
+
+ intel_pt_log("Buffer 1st timestamp " x64_fmt " ref timestamp " x64_fmt "\n",
+ tsc, buffer->ref_timestamp);
+
+ /*
+ * If the buffer contains a timestamp earlier that the fast forward
+ * timestamp, then record it, else stop.
+ */
+ if (tsc < d->timestamp)
+ d->buf_timestamp = buffer->ref_timestamp;
+ else
+ return 1;
+
+ return 0;
+}
+
+/**
+ * intel_pt_fast_forward - reposition decoder forwards.
+ * @decoder: Intel PT decoder
+ * @timestamp: timestamp to fast forward towards
+ *
+ * Reposition decoder at the last PSB with a timestamp earlier than @timestamp.
+ *
+ * Return: 0 on success or negative error code on failure.
+ */
+int intel_pt_fast_forward(struct intel_pt_decoder *decoder, uint64_t timestamp)
+{
+ struct fast_forward_data d = { .timestamp = timestamp };
+ unsigned char *buf;
+ size_t len;
+ int err;
+
+ intel_pt_log("Fast forward towards timestamp " x64_fmt "\n", timestamp);
+
+ /* Find buffer timestamp of buffer to fast forward to */
+ err = decoder->lookahead(decoder->data, intel_pt_ff_cb, &d);
+ if (err < 0)
+ return err;
+
+ /* Walk to buffer with same buffer timestamp */
+ if (d.buf_timestamp) {
+ do {
+ decoder->pos += decoder->len;
+ decoder->len = 0;
+ err = intel_pt_get_next_data(decoder, true);
+ /* -ENOLINK means non-consecutive trace */
+ if (err && err != -ENOLINK)
+ return err;
+ } while (decoder->buf_timestamp != d.buf_timestamp);
+ }
+
+ if (!decoder->buf)
+ return 0;
+
+ buf = (unsigned char *)decoder->buf;
+ len = decoder->len;
+
+ if (!intel_pt_next_psb(&buf, &len))
+ return 0;
+
+ /*
+ * Walk PSBs while the PSB timestamp is less than the fast forward
+ * timestamp.
+ */
+ do {
+ uint64_t tsc;
+ size_t rem;
+
+ if (!intel_pt_next_tsc(buf, len, &tsc, &rem))
+ break;
+ tsc = intel_pt_8b_tsc(tsc, decoder->buf_timestamp);
+ /*
+ * A TSC packet can slip past MTC packets but, after fast
+ * forward, decoding starts at the TSC timestamp. That means
+ * the timestamps may not be exactly the same as the timestamps
+ * that would have been decoded without fast forward.
+ */
+ if (tsc < timestamp) {
+ intel_pt_log("Fast forward to next PSB timestamp " x64_fmt "\n", tsc);
+ decoder->pos += decoder->len - len;
+ decoder->buf = buf;
+ decoder->len = len;
+ intel_pt_reposition(decoder);
+ } else {
+ break;
+ }
+ } while (intel_pt_step_psb(&buf, &len));
+
+ return 0;
+}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.