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From 14fe81602c9dd2f64ab803ed9c83b243226a6b05 Mon Sep 17 00:00:00 2001
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From: Lianbo Jiang <lijiang@redhat.com>
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Date: Tue, 19 Jul 2022 13:31:02 +0800
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Subject: [PATCH 3/3] Do not dump on the Single Range Output mode
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Kernel commit 670638477aed ("perf/x86/intel/pt: Opportunistically use
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single range output mode") may cause the following failure:
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ptdump: page excluded: kernel virtual address: xxx type: "struct topa_entry"
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Cannot read topa table
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When working on the Single Range Output mode, not support to dump and
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pint a warning.
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Signed-off-by: Lianbo Jiang <lijiang@redhat.com>
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---
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ptdump.c | 11 +++++++++++
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1 file changed, 11 insertions(+)
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diff --git a/ptdump.c b/ptdump.c
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index 54e4391739e3..d48cd0126716 100644
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--- a/ptdump.c
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+++ b/ptdump.c
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@@ -189,6 +189,17 @@ int init_pt_info(int cpu)
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dbgprintf(fp, " %d: 0x%016lx\n", i, page);
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}
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+ if (MEMBER_EXISTS("pt_buffer", "single")) {
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+ uint single = 0;
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+ if(!get_member(pt_info_ptr->pt_buffer, "pt_buffer", "single", &single)) {
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+ fprintf(fp, "failed to read pt_buffer.");
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+ return FALSE;
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+ }
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+
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+ if (!!single)
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+ error(FATAL, "Not support because of using Single Range Output instead of ToPA.\n");
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+ }
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+
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/* Get pt registes saved on panic */
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if(!get_member(pt_info_ptr->pt_buffer, "pt_buffer", "cur",
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&topa_base))
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--
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2.31.1
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