linux-kernel - [tip:perf/core] perf intel-pt: Add XMM registers to synthesized PEBS sample

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Message-ID: <tip-143d34a6b387b96aba42c49cb76d18ad3e3863e5@git.kernel.org>
Date:   Fri, 21 Jun 2019 23:40:55 -0700
From:   tip-bot for Adrian Hunter <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     adrian.hunter@...el.com, acme@...hat.com, mingo@...nel.org,
        hpa@...or.com, linux-kernel@...r.kernel.org, tglx@...utronix.de,
        jolsa@...hat.com
Subject: [tip:perf/core] perf intel-pt: Add XMM registers to synthesized
 PEBS sample

Commit-ID:  143d34a6b387b96aba42c49cb76d18ad3e3863e5
Gitweb:     https://git.kernel.org/tip/143d34a6b387b96aba42c49cb76d18ad3e3863e5
Author:     Adrian Hunter <adrian.hunter@...el.com>
AuthorDate: Mon, 10 Jun 2019 10:28:00 +0300
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Mon, 17 Jun 2019 15:57:18 -0300

perf intel-pt: Add XMM registers to synthesized PEBS sample

Add XMM register information from PEBS data in the Intel PT trace to the
synthesized PEBS sample.

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Link: http://lkml.kernel.org/r/20190610072803.10456-9-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/intel-pt.c | 30 +++++++++++++++++++++++++++++-
 1 file changed, 29 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/intel-pt.c b/tools/perf/util/intel-pt.c
index 00c2c96bb805..f83dd10bb7d0 100644
--- a/tools/perf/util/intel-pt.c
+++ b/tools/perf/util/intel-pt.c
@@ -1603,6 +1603,31 @@ static u64 *intel_pt_add_gp_regs(struct regs_dump *intr_regs, u64 *pos,
 	return pos;
 }
 
+#ifndef PERF_REG_X86_XMM0
+#define PERF_REG_X86_XMM0 32
+#endif
+
+static void intel_pt_add_xmm(struct regs_dump *intr_regs, u64 *pos,
+			     const struct intel_pt_blk_items *items,
+			     u64 regs_mask)
+{
+	u32 mask = items->has_xmm & (regs_mask >> PERF_REG_X86_XMM0);
+	const u64 *xmm = items->xmm;
+
+	/*
+	 * If there are any XMM registers, then there should be all of them.
+	 * Nevertheless, follow the logic to add only registers that were
+	 * requested (i.e. 'regs_mask') and that were provided (i.e. 'mask'),
+	 * and update the resulting mask (i.e. 'intr_regs->mask') accordingly.
+	 */
+	intr_regs->mask |= (u64)mask << PERF_REG_X86_XMM0;
+
+	for (; mask; mask >>= 1, xmm++) {
+		if (mask & 1)
+			*pos++ = *xmm;
+	}
+}
+
 static int intel_pt_synth_pebs_sample(struct intel_pt_queue *ptq)
 {
 	const struct intel_pt_blk_items *items = &ptq->state->items;
@@ -1657,13 +1682,16 @@ static int intel_pt_synth_pebs_sample(struct intel_pt_queue *ptq)
 	    items->mask[INTEL_PT_GP_REGS_POS]) {
 		u64 regs[sizeof(sample.intr_regs.mask)];
 		u64 regs_mask = evsel->attr.sample_regs_intr;
+		u64 *pos;
 
 		sample.intr_regs.abi = items->is_32_bit ?
 				       PERF_SAMPLE_REGS_ABI_32 :
 				       PERF_SAMPLE_REGS_ABI_64;
 		sample.intr_regs.regs = regs;
 
-		intel_pt_add_gp_regs(&sample.intr_regs, regs, items, regs_mask);
+		pos = intel_pt_add_gp_regs(&sample.intr_regs, regs, items, regs_mask);
+
+		intel_pt_add_xmm(&sample.intr_regs, pos, items, regs_mask);
 	}
 
 	return intel_pt_deliver_synth_event(pt, ptq, event, &sample, sample_type);