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aarch64: Enhanced CPU diagnostics for ld.so
This prints some information from struct cpu_features, and the midr_el1 and dczid_el0 system register contents on every CPU. Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
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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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@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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@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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@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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@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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@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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@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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@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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84
sysdeps/aarch64/dl-diagnostics-cpu.c
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84
sysdeps/aarch64/dl-diagnostics-cpu.c
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@ -0,0 +1,84 @@
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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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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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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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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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#include <dl-diagnostics.h>
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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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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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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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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 ("mops", GLRO (dl_aarch64_cpu_features).mops);
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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 ("prefer_sve_ifuncs",
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GLRO (dl_aarch64_cpu_features).prefer_sve_ifuncs);
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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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struct dl_iterate_cpu dic;
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_dl_iterate_cpu_init (&dic);
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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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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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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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