145 lines
5.7 KiB
Diff
145 lines
5.7 KiB
Diff
commit f8d8b1b1e6d3b8b93f224efc796b7ea083fdb83f
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Mon Apr 8 16:48:55 2024 +0200
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aarch64: Enhanced CPU diagnostics for ld.so
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This prints some information from struct cpu_features, and the midr_el1
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and dczid_el0 system register contents on every CPU.
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Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
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Modified for RHEL by: Patsy Griffin <patsy@redhat.com>
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Diagnostics for the cpu_features mops and prefer_sve_ifuncs are not
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currently supported on aarch64.
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diff -Nrup a/manual/dynlink.texi b/manual/dynlink.texi
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--- a/manual/dynlink.texi 2024-05-31 20:55:08.238959456 -0400
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+++ b/manual/dynlink.texi 2024-05-31 20:55:41.298121623 -0400
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@@ -224,6 +224,40 @@ reflect adjustment by @theglibc{}.
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These Linux-specific items show the values of @code{struct utsname}, as
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reported by the @code{uname} function. @xref{Platform Type}.
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+@item aarch64.cpu_features.@dots{}
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+These items are specific to the AArch64 architectures. They report data
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+@theglibc{} uses to activate conditionally supported features such as
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+BTI and MTE, and to select alternative function implementations.
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+
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+@item aarch64.processor[@var{index}].@dots{}
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+These are additional items for the AArch64 architecture and are
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+described below.
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+
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+@item aarch64.processor[@var{index}].requested=@var{kernel-cpu}
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+The kernel is told to run the subsequent probing on the CPU numbered
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+@var{kernel-cpu}. The values @var{kernel-cpu} and @var{index} can be
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+distinct if there are gaps in the process CPU affinity mask. This line
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+is not included if CPU affinity mask information is not available.
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+
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+@item aarch64.processor[@var{index}].observed=@var{kernel-cpu}
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+This line reports the kernel CPU number @var{kernel-cpu} on which the
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+probing code initially ran. If the CPU number cannot be obtained,
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+this line is not printed.
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+
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+@item aarch64.processor[@var{index}].observed_node=@var{node}
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+This reports the observed NUMA node number, as reported by the
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+@code{getcpu} system call. If this information cannot be obtained, this
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+line is not printed.
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+
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+@item aarch64.processor[@var{index}].midr_el1=@var{value}
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+The value of the @code{midr_el1} system register on the processor
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+@var{index}. This line is only printed if the kernel indicates that
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+this system register is supported.
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+
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+@item aarch64.processor[@var{index}].dczid_el0=@var{value}
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+The value of the @code{dczid_el0} system register on the processor
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+@var{index}.
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+
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@cindex CPUID (diagnostics)
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@item x86.cpu_features.@dots{}
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These items are specific to the i386 and x86-64 architectures. They
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diff -Nrup a/sysdeps/aarch64/dl-diagnostics-cpu.c b/sysdeps/aarch64/dl-diagnostics-cpu.c
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--- a/sysdeps/aarch64/dl-diagnostics-cpu.c 1969-12-31 19:00:00.000000000 -0500
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+++ b/sysdeps/aarch64/dl-diagnostics-cpu.c 2024-05-31 20:57:23.536623129 -0400
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@@ -0,0 +1,81 @@
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+/* Print CPU diagnostics data in ld.so. AArch64 version.
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+ Copyright (C) 2021-2024 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Lesser General Public
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+ License as published by the Free Software Foundation; either
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+ version 2.1 of the License, or (at your option) any later version.
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+
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+ The GNU C Library is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library; if not, see
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+ <https://www.gnu.org/licenses/>. */
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+
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+#include <dl-diagnostics.h>
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+
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+#include <cpu-features.h>
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+#include <dl-iterate_cpu.h>
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+#include <ldsodefs.h>
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+#include <sys/auxv.h>
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+
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+static void
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+print_cpu_features_value (const char *label, uint64_t value)
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+{
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+ _dl_printf ("aarch64.cpu_features.");
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+ _dl_diagnostics_print_labeled_value (label, value);
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+}
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+
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+static void
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+print_per_cpu_value (const struct dl_iterate_cpu *dic,
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+ const char *label, uint64_t value)
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+{
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+ _dl_printf ("aarch64.processor[0x%x].", dic->processor_index);
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+ _dl_diagnostics_print_labeled_value (label, value);
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+}
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+
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+void
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+_dl_diagnostics_cpu (void)
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+{
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+ print_cpu_features_value ("bti", GLRO (dl_aarch64_cpu_features).bti);
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+ print_cpu_features_value ("midr_el1",
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+ GLRO (dl_aarch64_cpu_features).midr_el1);
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+ print_cpu_features_value ("mte_state",
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+ GLRO (dl_aarch64_cpu_features).mte_state);
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+ print_cpu_features_value ("sve", GLRO (dl_aarch64_cpu_features).sve);
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+ print_cpu_features_value ("zva_size",
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+ GLRO (dl_aarch64_cpu_features).zva_size);
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+
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+ struct dl_iterate_cpu dic;
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+ _dl_iterate_cpu_init (&dic);
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+
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+ while (_dl_iterate_cpu_next (&dic))
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+ {
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+ if (dic.requested_cpu >= 0)
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+ _dl_printf ("aarch64.processor[0x%x].requested=0x%x\n",
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+ dic.processor_index, dic.requested_cpu);
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+ if (dic.actual_cpu >= 0)
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+ _dl_printf ("aarch64.processor[0x%x].observed=0x%x\n",
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+ dic.processor_index, dic.actual_cpu);
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+ if (dic.actual_node >= 0)
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+ _dl_printf ("aarch64.processor[0x%x].observed_node=0x%x\n",
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+ dic.processor_index, dic.actual_node);
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+
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+ if (GLRO (dl_hwcap) & HWCAP_CPUID)
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+ {
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+ uint64_t midr_el1;
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+ asm ("mrs %0, midr_el1" : "=r" (midr_el1));
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+ print_per_cpu_value (&dic, "midr_el1", midr_el1);
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+ }
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+
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+ {
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+ uint64_t dczid_el0;
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+ asm ("mrs %0, dczid_el0" : "=r" (dczid_el0));
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+ print_per_cpu_value (&dic, "dczid_el0", dczid_el0);
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+ }
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+ }
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+}
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