[PATCH 02/11] perf intel-pt: Add Intel PT packet decoder test

Adrian Hunter
2019-06-10T07:29:27Z

Add Intel PT packet decoder test. This test feeds byte sequences to the
Intel PT packet decoder and checks the results. Changes to the packet
context are also checked.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
tools/perf/arch/x86/include/arch-tests.h | 1 +
tools/perf/arch/x86/tests/Build | 2 +-
tools/perf/arch/x86/tests/arch-tests.c | 4 +
.../x86/tests/intel-pt-pkt-decoder-test.c | 304 ++++++++++++++++++
4 files changed, 310 insertions(+), 1 deletion(-)
create mode 100644 tools/perf/arch/x86/tests/intel-pt-pkt-decoder-test.c

diff --git a/tools/perf/arch/x86/include/arch-tests.h b/tools/perf/arch/x86/include/arch-tests.h
index 613709cfbbd0..c41c5affe4be 100644
--- a/tools/perf/arch/x86/include/arch-tests.h
+++ b/tools/perf/arch/x86/include/arch-tests.h
@@ -9,6 +9,7 @@ struct test;
int test__rdpmc(struct test *test __maybe_unused, int subtest);
int test__perf_time_to_tsc(struct test *test __maybe_unused, int subtest);
int test__insn_x86(struct test *test __maybe_unused, int subtest);
+int test__intel_pt_pkt_decoder(struct test *test, int subtest);
int test__bp_modify(struct test *test, int subtest);

#ifdef HAVE_DWARF_UNWIND_SUPPORT
diff --git a/tools/perf/arch/x86/tests/Build b/tools/perf/arch/x86/tests/Build
index 3d83d0c6982d..2997c506550c 100644
--- a/tools/perf/arch/x86/tests/Build
+++ b/tools/perf/arch/x86/tests/Build
@@ -4,5 +4,5 @@ perf-$(CONFIG_DWARF_UNWIND) += dwarf-unwind.o
perf-y += arch-tests.o
perf-y += rdpmc.o
perf-y += perf-time-to-tsc.o
-perf-$(CONFIG_AUXTRACE) += insn-x86.o
+perf-$(CONFIG_AUXTRACE) += insn-x86.o intel-pt-pkt-decoder-test.o
perf-$(CONFIG_X86_64) += bp-modify.o
diff --git a/tools/perf/arch/x86/tests/arch-tests.c b/tools/perf/arch/x86/tests/arch-tests.c
index d47d3f8e3c8e..6763135aec17 100644
--- a/tools/perf/arch/x86/tests/arch-tests.c
+++ b/tools/perf/arch/x86/tests/arch-tests.c
@@ -23,6 +23,10 @@ struct test arch_tests[] = {
.desc = "x86 instruction decoder - new instructions",
.func = test__insn_x86,
},
+ {
+ .desc = "Intel PT packet decoder",
+ .func = test__intel_pt_pkt_decoder,
+ },
#endif
#if defined(__x86_64__)
{
diff --git a/tools/perf/arch/x86/tests/intel-pt-pkt-decoder-test.c b/tools/perf/arch/x86/tests/intel-pt-pkt-decoder-test.c
new file mode 100644
index 000000000000..901bf1f449c4
--- /dev/null
+++ b/tools/perf/arch/x86/tests/intel-pt-pkt-decoder-test.c
@@ -0,0 +1,304 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <string.h>
+
+#include "intel-pt-decoder/intel-pt-pkt-decoder.h"
+
+#include "debug.h"
+#include "tests/tests.h"
+#include "arch-tests.h"
+
+/**
+ * struct test_data - Test data.
+ * @len: number of bytes to decode
+ * @bytes: bytes to decode
+ * @ctx: packet context to decode
+ * @packet: expected packet
+ * @new_ctx: expected new packet context
+ * @ctx_unchanged: the packet context must not change
+ */
+struct test_data {
+ int len;
+ u8 bytes[INTEL_PT_PKT_MAX_SZ];
+ enum intel_pt_pkt_ctx ctx;
+ struct intel_pt_pkt packet;
+ enum intel_pt_pkt_ctx new_ctx;
+ int ctx_unchanged;
+} data[] = {
+ /* Padding Packet */
+ {1, {0}, 0, {INTEL_PT_PAD, 0, 0}, 0, 1 },
+ /* Short Taken/Not Taken Packet */
+ {1, {4}, 0, {INTEL_PT_TNT, 1, 0}, 0, 0 },
+ {1, {6}, 0, {INTEL_PT_TNT, 1, 0x20ULL << 58}, 0, 0 },
+ {1, {0x80}, 0, {INTEL_PT_TNT, 6, 0}, 0, 0 },
+ {1, {0xfe}, 0, {INTEL_PT_TNT, 6, 0x3fULL << 58}, 0, 0 },
+ /* Long Taken/Not Taken Packet */
+ {8, {0x02, 0xa3, 2}, 0, {INTEL_PT_TNT, 1, 0xa302ULL << 47}, 0, 0 },
+ {8, {0x02, 0xa3, 3}, 0, {INTEL_PT_TNT, 1, 0x1a302ULL << 47}, 0, 0 },
+ {8, {0x02, 0xa3, 0, 0, 0, 0, 0, 0x80}, 0, {INTEL_PT_TNT, 47, 0xa302ULL << 1}, 0, 0 },
+ {8, {0x02, 0xa3, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}, 0, {INTEL_PT_TNT, 47, 0xffffffffffffa302ULL << 1}, 0, 0 },
+ /* Target IP Packet */
+ {1, {0x0d}, 0, {INTEL_PT_TIP, 0, 0}, 0, 0 },
+ {3, {0x2d, 1, 2}, 0, {INTEL_PT_TIP, 1, 0x201}, 0, 0 },
+ {5, {0x4d, 1, 2, 3, 4}, 0, {INTEL_PT_TIP, 2, 0x4030201}, 0, 0 },
+ {7, {0x6d, 1, 2, 3, 4, 5, 6}, 0, {INTEL_PT_TIP, 3, 0x60504030201}, 0, 0 },
+ {7, {0x8d, 1, 2, 3, 4, 5, 6}, 0, {INTEL_PT_TIP, 4, 0x60504030201}, 0, 0 },
+ {9, {0xcd, 1, 2, 3, 4, 5, 6, 7, 8}, 0, {INTEL_PT_TIP, 6, 0x807060504030201}, 0, 0 },
+ /* Packet Generation Enable */
+ {1, {0x11}, 0, {INTEL_PT_TIP_PGE, 0, 0}, 0, 0 },
+ {3, {0x31, 1, 2}, 0, {INTEL_PT_TIP_PGE, 1, 0x201}, 0, 0 },
+ {5, {0x51, 1, 2, 3, 4}, 0, {INTEL_PT_TIP_PGE, 2, 0x4030201}, 0, 0 },
+ {7, {0x71, 1, 2, 3, 4, 5, 6}, 0, {INTEL_PT_TIP_PGE, 3, 0x60504030201}, 0, 0 },
+ {7, {0x91, 1, 2, 3, 4, 5, 6}, 0, {INTEL_PT_TIP_PGE, 4, 0x60504030201}, 0, 0 },
+ {9, {0xd1, 1, 2, 3, 4, 5, 6, 7, 8}, 0, {INTEL_PT_TIP_PGE, 6, 0x807060504030201}, 0, 0 },
+ /* Packet Generation Disable */
+ {1, {0x01}, 0, {INTEL_PT_TIP_PGD, 0, 0}, 0, 0 },
+ {3, {0x21, 1, 2}, 0, {INTEL_PT_TIP_PGD, 1, 0x201}, 0, 0 },
+ {5, {0x41, 1, 2, 3, 4}, 0, {INTEL_PT_TIP_PGD, 2, 0x4030201}, 0, 0 },
+ {7, {0x61, 1, 2, 3, 4, 5, 6}, 0, {INTEL_PT_TIP_PGD, 3, 0x60504030201}, 0, 0 },
+ {7, {0x81, 1, 2, 3, 4, 5, 6}, 0, {INTEL_PT_TIP_PGD, 4, 0x60504030201}, 0, 0 },
+ {9, {0xc1, 1, 2, 3, 4, 5, 6, 7, 8}, 0, {INTEL_PT_TIP_PGD, 6, 0x807060504030201}, 0, 0 },
+ /* Flow Update Packet */
+ {1, {0x1d}, 0, {INTEL_PT_FUP, 0, 0}, 0, 0 },
+ {3, {0x3d, 1, 2}, 0, {INTEL_PT_FUP, 1, 0x201}, 0, 0 },
+ {5, {0x5d, 1, 2, 3, 4}, 0, {INTEL_PT_FUP, 2, 0x4030201}, 0, 0 },
+ {7, {0x7d, 1, 2, 3, 4, 5, 6}, 0, {INTEL_PT_FUP, 3, 0x60504030201}, 0, 0 },
+ {7, {0x9d, 1, 2, 3, 4, 5, 6}, 0, {INTEL_PT_FUP, 4, 0x60504030201}, 0, 0 },
+ {9, {0xdd, 1, 2, 3, 4, 5, 6, 7, 8}, 0, {INTEL_PT_FUP, 6, 0x807060504030201}, 0, 0 },
+ /* Paging Information Packet */
+ {8, {0x02, 0x43, 2, 4, 6, 8, 10, 12}, 0, {INTEL_PT_PIP, 0, 0x60504030201}, 0, 0 },
+ {8, {0x02, 0x43, 3, 4, 6, 8, 10, 12}, 0, {INTEL_PT_PIP, 0, 0x60504030201 | (1ULL << 63)}, 0, 0 },
+ /* Mode Exec Packet */
+ {2, {0x99, 0x00}, 0, {INTEL_PT_MODE_EXEC, 0, 16}, 0, 0 },
+ {2, {0x99, 0x01}, 0, {INTEL_PT_MODE_EXEC, 0, 64}, 0, 0 },
+ {2, {0x99, 0x02}, 0, {INTEL_PT_MODE_EXEC, 0, 32}, 0, 0 },
+ /* Mode TSX Packet */
+ {2, {0x99, 0x20}, 0, {INTEL_PT_MODE_TSX, 0, 0}, 0, 0 },
+ {2, {0x99, 0x21}, 0, {INTEL_PT_MODE_TSX, 0, 1}, 0, 0 },
+ {2, {0x99, 0x22}, 0, {INTEL_PT_MODE_TSX, 0, 2}, 0, 0 },
+ /* Trace Stop Packet */
+ {2, {0x02, 0x83}, 0, {INTEL_PT_TRACESTOP, 0, 0}, 0, 0 },
+ /* Core:Bus Ratio Packet */
+ {4, {0x02, 0x03, 0x12, 0}, 0, {INTEL_PT_CBR, 0, 0x12}, 0, 1 },
+ /* Timestamp Counter Packet */
+ {8, {0x19, 1, 2, 3, 4, 5, 6, 7}, 0, {INTEL_PT_TSC, 0, 0x7060504030201}, 0, 1 },
+ /* Mini Time Counter Packet */
+ {2, {0x59, 0x12}, 0, {INTEL_PT_MTC, 0, 0x12}, 0, 1 },
+ /* TSC / MTC Alignment Packet */
+ {7, {0x02, 0x73}, 0, {INTEL_PT_TMA, 0, 0}, 0, 1 },
+ {7, {0x02, 0x73, 1, 2}, 0, {INTEL_PT_TMA, 0, 0x201}, 0, 1 },
+ {7, {0x02, 0x73, 0, 0, 0, 0xff, 1}, 0, {INTEL_PT_TMA, 0x1ff, 0}, 0, 1 },
+ {7, {0x02, 0x73, 0x80, 0xc0, 0, 0xff, 1}, 0, {INTEL_PT_TMA, 0x1ff, 0xc080}, 0, 1 },
+ /* Cycle Count Packet */
+ {1, {0x03}, 0, {INTEL_PT_CYC, 0, 0}, 0, 1 },
+ {1, {0x0b}, 0, {INTEL_PT_CYC, 0, 1}, 0, 1 },
+ {1, {0xfb}, 0, {INTEL_PT_CYC, 0, 0x1f}, 0, 1 },
+ {2, {0x07, 2}, 0, {INTEL_PT_CYC, 0, 0x20}, 0, 1 },
+ {2, {0xff, 0xfe}, 0, {INTEL_PT_CYC, 0, 0xfff}, 0, 1 },
+ {3, {0x07, 1, 2}, 0, {INTEL_PT_CYC, 0, 0x1000}, 0, 1 },
+ {3, {0xff, 0xff, 0xfe}, 0, {INTEL_PT_CYC, 0, 0x7ffff}, 0, 1 },
+ {4, {0x07, 1, 1, 2}, 0, {INTEL_PT_CYC, 0, 0x80000}, 0, 1 },
+ {4, {0xff, 0xff, 0xff, 0xfe}, 0, {INTEL_PT_CYC, 0, 0x3ffffff}, 0, 1 },
+ {5, {0x07, 1, 1, 1, 2}, 0, {INTEL_PT_CYC, 0, 0x4000000}, 0, 1 },
+ {5, {0xff, 0xff, 0xff, 0xff, 0xfe}, 0, {INTEL_PT_CYC, 0, 0x1ffffffff}, 0, 1 },
+ {6, {0x07, 1, 1, 1, 1, 2}, 0, {INTEL_PT_CYC, 0, 0x200000000}, 0, 1 },
+ {6, {0xff, 0xff, 0xff, 0xff, 0xff, 0xfe}, 0, {INTEL_PT_CYC, 0, 0xffffffffff}, 0, 1 },
+ {7, {0x07, 1, 1, 1, 1, 1, 2}, 0, {INTEL_PT_CYC, 0, 0x10000000000}, 0, 1 },
+ {7, {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe}, 0, {INTEL_PT_CYC, 0, 0x7fffffffffff}, 0, 1 },
+ {8, {0x07, 1, 1, 1, 1, 1, 1, 2}, 0, {INTEL_PT_CYC, 0, 0x800000000000}, 0, 1 },
+ {8, {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe}, 0, {INTEL_PT_CYC, 0, 0x3fffffffffffff}, 0, 1 },
+ {9, {0x07, 1, 1, 1, 1, 1, 1, 1, 2}, 0, {INTEL_PT_CYC, 0, 0x40000000000000}, 0, 1 },
+ {9, {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe}, 0, {INTEL_PT_CYC, 0, 0x1fffffffffffffff}, 0, 1 },
+ {10, {0x07, 1, 1, 1, 1, 1, 1, 1, 1, 2}, 0, {INTEL_PT_CYC, 0, 0x2000000000000000}, 0, 1 },
+ {10, {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xe}, 0, {INTEL_PT_CYC, 0, 0xffffffffffffffff}, 0, 1 },
+ /* Virtual-Machine Control Structure Packet */
+ {7, {0x02, 0xc8, 1, 2, 3, 4, 5}, 0, {INTEL_PT_VMCS, 5, 0x504030201}, 0, 0 },
+ /* Overflow Packet */
+ {2, {0x02, 0xf3}, 0, {INTEL_PT_OVF, 0, 0}, 0, 0 },
+ {2, {0x02, 0xf3}, INTEL_PT_BLK_4_CTX, {INTEL_PT_OVF, 0, 0}, 0, 0 },
+ {2, {0x02, 0xf3}, INTEL_PT_BLK_8_CTX, {INTEL_PT_OVF, 0, 0}, 0, 0 },
+ /* Packet Stream Boundary*/
+ {16, {0x02, 0x82, 0x02, 0x82, 0x02, 0x82, 0x02, 0x82, 0x02, 0x82, 0x02, 0x82, 0x02, 0x82, 0x02, 0x82}, 0, {INTEL_PT_PSB, 0, 0}, 0, 0 },
+ {16, {0x02, 0x82, 0x02, 0x82, 0x02, 0x82, 0x02, 0x82, 0x02, 0x82, 0x02, 0x82, 0x02, 0x82, 0x02, 0x82}, INTEL_PT_BLK_4_CTX, {INTEL_PT_PSB, 0, 0}, 0, 0 },
+ {16, {0x02, 0x82, 0x02, 0x82, 0x02, 0x82, 0x02, 0x82, 0x02, 0x82, 0x02, 0x82, 0x02, 0x82, 0x02, 0x82}, INTEL_PT_BLK_8_CTX, {INTEL_PT_PSB, 0, 0}, 0, 0 },
+ /* PSB End Packet */
+ {2, {0x02, 0x23}, 0, {INTEL_PT_PSBEND, 0, 0}, 0, 0 },
+ /* Maintenance Packet */
+ {11, {0x02, 0xc3, 0x88, 1, 2, 3, 4, 5, 6, 7}, 0, {INTEL_PT_MNT, 0, 0x7060504030201}, 0, 1 },
+ /* Write Data to PT Packet */
+ {6, {0x02, 0x12, 1, 2, 3, 4}, 0, {INTEL_PT_PTWRITE, 0, 0x4030201}, 0, 0 },
+ {10, {0x02, 0x32, 1, 2, 3, 4, 5, 6, 7, 8}, 0, {INTEL_PT_PTWRITE, 1, 0x807060504030201}, 0, 0 },
+ {6, {0x02, 0x92, 1, 2, 3, 4}, 0, {INTEL_PT_PTWRITE_IP, 0, 0x4030201}, 0, 0 },
+ {10, {0x02, 0xb2, 1, 2, 3, 4, 5, 6, 7, 8}, 0, {INTEL_PT_PTWRITE_IP, 1, 0x807060504030201}, 0, 0 },
+ /* Execution Stop Packet */
+ {2, {0x02, 0x62}, 0, {INTEL_PT_EXSTOP, 0, 0}, 0, 1 },
+ {2, {0x02, 0xe2}, 0, {INTEL_PT_EXSTOP_IP, 0, 0}, 0, 1 },
+ /* Monitor Wait Packet */
+ {10, {0x02, 0xc2}, 0, {INTEL_PT_MWAIT, 0, 0}, 0, 0 },
+ {10, {0x02, 0xc2, 1, 2, 3, 4, 5, 6, 7, 8}, 0, {INTEL_PT_MWAIT, 0, 0x807060504030201}, 0, 0 },
+ {10, {0x02, 0xc2, 0xff, 2, 3, 4, 7, 6, 7, 8}, 0, {INTEL_PT_MWAIT, 0, 0x8070607040302ff}, 0, 0 },
+ /* Power Entry Packet */
+ {4, {0x02, 0x22}, 0, {INTEL_PT_PWRE, 0, 0}, 0, 1 },
+ {4, {0x02, 0x22, 1, 2}, 0, {INTEL_PT_PWRE, 0, 0x0201}, 0, 1 },
+ {4, {0x02, 0x22, 0x80, 0x34}, 0, {INTEL_PT_PWRE, 0, 0x3480}, 0, 1 },
+ {4, {0x02, 0x22, 0x00, 0x56}, 0, {INTEL_PT_PWRE, 0, 0x5600}, 0, 1 },
+ /* Power Exit Packet */
+ {7, {0x02, 0xa2}, 0, {INTEL_PT_PWRX, 0, 0}, 0, 1 },
+ {7, {0x02, 0xa2, 1, 2, 3, 4, 5}, 0, {INTEL_PT_PWRX, 0, 0x504030201}, 0, 1 },
+ {7, {0x02, 0xa2, 0xff, 0xff, 0xff, 0xff, 0xff}, 0, {INTEL_PT_PWRX, 0, 0xffffffffff}, 0, 1 },
+ /* Block Begin Packet */
+ {3, {0x02, 0x63, 0x00}, 0, {INTEL_PT_BBP, 0, 0}, INTEL_PT_BLK_8_CTX, 0 },
+ {3, {0x02, 0x63, 0x80}, 0, {INTEL_PT_BBP, 1, 0}, INTEL_PT_BLK_4_CTX, 0 },
+ {3, {0x02, 0x63, 0x1f}, 0, {INTEL_PT_BBP, 0, 0x1f}, INTEL_PT_BLK_8_CTX, 0 },
+ {3, {0x02, 0x63, 0x9f}, 0, {INTEL_PT_BBP, 1, 0x1f}, INTEL_PT_BLK_4_CTX, 0 },
+ /* 4-byte Block Item Packet */
+ {5, {0x04}, INTEL_PT_BLK_4_CTX, {INTEL_PT_BIP, 0, 0}, INTEL_PT_BLK_4_CTX, 0 },
+ {5, {0xfc}, INTEL_PT_BLK_4_CTX, {INTEL_PT_BIP, 0x1f, 0}, INTEL_PT_BLK_4_CTX, 0 },
+ {5, {0x04, 1, 2, 3, 4}, INTEL_PT_BLK_4_CTX, {INTEL_PT_BIP, 0, 0x04030201}, INTEL_PT_BLK_4_CTX, 0 },
+ {5, {0xfc, 1, 2, 3, 4}, INTEL_PT_BLK_4_CTX, {INTEL_PT_BIP, 0x1f, 0x04030201}, INTEL_PT_BLK_4_CTX, 0 },
+ /* 8-byte Block Item Packet */
+ {9, {0x04}, INTEL_PT_BLK_8_CTX, {INTEL_PT_BIP, 0, 0}, INTEL_PT_BLK_8_CTX, 0 },
+ {9, {0xfc}, INTEL_PT_BLK_8_CTX, {INTEL_PT_BIP, 0x1f, 0}, INTEL_PT_BLK_8_CTX, 0 },
+ {9, {0x04, 1, 2, 3, 4, 5, 6, 7, 8}, INTEL_PT_BLK_8_CTX, {INTEL_PT_BIP, 0, 0x0807060504030201}, INTEL_PT_BLK_8_CTX, 0 },
+ {9, {0xfc, 1, 2, 3, 4, 5, 6, 7, 8}, INTEL_PT_BLK_8_CTX, {INTEL_PT_BIP, 0x1f, 0x0807060504030201}, INTEL_PT_BLK_8_CTX, 0 },
+ /* Block End Packet */
+ {2, {0x02, 0x33}, INTEL_PT_BLK_4_CTX, {INTEL_PT_BEP, 0, 0}, 0, 0 },
+ {2, {0x02, 0xb3}, INTEL_PT_BLK_4_CTX, {INTEL_PT_BEP_IP, 0, 0}, 0, 0 },
+ {2, {0x02, 0x33}, INTEL_PT_BLK_8_CTX, {INTEL_PT_BEP, 0, 0}, 0, 0 },
+ {2, {0x02, 0xb3}, INTEL_PT_BLK_8_CTX, {INTEL_PT_BEP_IP, 0, 0}, 0, 0 },
+ /* Terminator */
+ {0, {0}, 0, {0, 0, 0}, 0, 0 },
+};
+
+static int dump_packet(struct intel_pt_pkt *packet, u8 *bytes, int len)
+{
+ char desc[INTEL_PT_PKT_DESC_MAX];
+ int ret, i;
+
+ for (i = 0; i < len; i++)
+ pr_debug(" %02x", bytes[i]);
+ for (; i < INTEL_PT_PKT_MAX_SZ; i++)
+ pr_debug(" ");
+ pr_debug(" ");
+ ret = intel_pt_pkt_desc(packet, desc, INTEL_PT_PKT_DESC_MAX);
+ if (ret < 0) {
+ pr_debug("intel_pt_pkt_desc failed!\n");
+ return TEST_FAIL;
+ }
+ pr_debug("%s\n", desc);
+
+ return TEST_OK;
+}
+
+static void decoding_failed(struct test_data *d)
+{
+ pr_debug("Decoding failed!\n");
+ pr_debug("Decoding: ");
+ dump_packet(&d->packet, d->bytes, d->len);
+}
+
+static int fail(struct test_data *d, struct intel_pt_pkt *packet, int len,
+ enum intel_pt_pkt_ctx new_ctx)
+{
+ decoding_failed(d);
+
+ if (len != d->len)
+ pr_debug("Expected length: %d Decoded length %d\n",
+ d->len, len);
+
+ if (packet->type != d->packet.type)
+ pr_debug("Expected type: %d Decoded type %d\n",
+ d->packet.type, packet->type);
+
+ if (packet->count != d->packet.count)
+ pr_debug("Expected count: %d Decoded count %d\n",
+ d->packet.count, packet->count);
+
+ if (packet->payload != d->packet.payload)
+ pr_debug("Expected payload: 0x%llx Decoded payload 0x%llx\n",
+ (unsigned long long)d->packet.payload,
+ (unsigned long long)packet->payload);
+
+ if (new_ctx != d->new_ctx)
+ pr_debug("Expected packet context: %d Decoded packet context %d\n",
+ d->new_ctx, new_ctx);
+
+ return TEST_FAIL;
+}
+
+static int test_ctx_unchanged(struct test_data *d, struct intel_pt_pkt *packet,
+ enum intel_pt_pkt_ctx ctx)
+{
+ enum intel_pt_pkt_ctx old_ctx = ctx;
+
+ intel_pt_upd_pkt_ctx(packet, &ctx);
+
+ if (ctx != old_ctx) {
+ decoding_failed(d);
+ pr_debug("Packet context changed!\n");
+ return TEST_FAIL;
+ }
+
+ return TEST_OK;
+}
+
+static int test_one(struct test_data *d)
+{
+ struct intel_pt_pkt packet;
+ enum intel_pt_pkt_ctx ctx = d->ctx;
+ int ret;
+
+ memset(&packet, 0xff, sizeof(packet));
+
+ /* Decode a packet */
+ ret = intel_pt_get_packet(d->bytes, d->len, &packet, &ctx);
+ if (ret < 0 || ret > INTEL_PT_PKT_MAX_SZ) {
+ decoding_failed(d);
+ pr_debug("intel_pt_get_packet returned %d\n", ret);
+ return TEST_FAIL;
+ }
+
+ /* Some packets must always leave the packet context unchanged */
+ if (d->ctx_unchanged) {
+ int err;
+
+ err = test_ctx_unchanged(d, &packet, INTEL_PT_NO_CTX);
+ if (err)
+ return err;
+ err = test_ctx_unchanged(d, &packet, INTEL_PT_BLK_4_CTX);
+ if (err)
+ return err;
+ err = test_ctx_unchanged(d, &packet, INTEL_PT_BLK_8_CTX);
+ if (err)
+ return err;
+ }
+
+ /* Compare to the expected values */
+ if (ret != d->len || packet.type != d->packet.type ||
+ packet.count != d->packet.count ||
+ packet.payload != d->packet.payload || ctx != d->new_ctx)
+ return fail(d, &packet, ret, ctx);
+
+ pr_debug("Decoded ok:");
+ ret = dump_packet(&d->packet, d->bytes, d->len);
+
+ return ret;
+}
+
+/*
+ * This test feeds byte sequences to the Intel PT packet decoder and checks the
+ * results. Changes to the packet context are also checked.
+ */
+int test__intel_pt_pkt_decoder(struct test *test __maybe_unused, int subtest __maybe_unused)
+{
+ struct test_data *d = data;
+ int ret;
+
+ for (d = data; d->len; d++) {
+ ret = test_one(d);
+ if (ret)
+ return ret;
+ }
+
+ return TEST_OK;
+}
--
2.17.1