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Date: Wed, 18 Nov 2020 20:15:29 +0100
From: Borislav Petkov <bp@...en8.de>
To: Feng Tang <feng.tang@...el.com>
Cc: Peter Zijlstra <peterz@...radead.org>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>,
"H . Peter Anvin" <hpa@...or.com>,
Dave Hansen <dave.hansen@...el.com>, x86@...nel.org,
linux-kernel@...r.kernel.org, nivedita@...m.mit.edu,
thomas.lendacky@....com, yazen.ghannam@....com, wei.huang2@....com
Subject: Re: [RFC PATCH v3] tools/x86: add kcpuid tool to show raw CPU
features
On Thu, Oct 22, 2020 at 01:21:23PM +0800, Feng Tang wrote:
> diff --git a/tools/arch/x86/kcpuid/kcpuid.c b/tools/arch/x86/kcpuid/kcpuid.c
> new file mode 100644
> index 0000000..9bd35b7
> --- /dev/null
> +++ b/tools/arch/x86/kcpuid/kcpuid.c
> @@ -0,0 +1,618 @@
> +// SPDX-License-Identifier: GPL-2.0
You need here:
#define _GNU_SOURCE
otherwise:
cc -Wextra -O2 -Wall -I../../../include -o kcpuid kcpuid.c
kcpuid.c: In function ‘parse_line’:
kcpuid.c:324:6: warning: implicit declaration of function ‘strcasestr’; did you mean ‘strcasecmp’? [-Wimplicit-function-declaration]
324 | if (strcasestr(buf, "EAX"))
| ^~~~~~~~~~
| strcasecmp
Also, options text needs fixing:
usage: kcpuid [-abdfhr] [-l leaf] [-s subleaf]
-a|--all Show info of all CPUID leafs and subleafs(default on)
-b|--bitflags Show boolean flags only
-d|--detail Show details of the flag/fields
-f|--flags Show boolean flags only
that f is user_csv, above in the "usage" line too.
-h|--help Show usage info
-l|--leaf=index Specify the leaf you want to check
-r|--raw Show raw cpuid data
-s|--subleaf=sub Specify the subleaf you want to check
> +/*
> + * Parse text file, and construct the array of all CPUID leafs and subleafs
> + */
> +static void parse_text(void)
> +{
> + FILE *file;
> + char *filename, *line = NULL;
Do here:
char *filename = def_csv;
> + size_t len = 0;
> + int ret;
> +
> + if (show_raw)
> + return;
> +
> + filename = user_csv ? user_csv : def_csv;
And now you do:
if (user_csv)
filename = user_csv;
But something's not working still. I've added debug output and it chokes
on the test data:
$ ./kcpuid -f cpuid.csv
This platform has 51 CPUID leafs and subleafs.
parse_text: filename: cpuid.csv
open
parsing [# The basic row format is:
]parsing [# LEAF,SUBLEAF,register_name,bits,short name,long description
]parsing [
]parsing [# Leaf 00H
]parsing [ 0, 0, EAX, 31:0, max_basic_leafs, Max input value for supported subleafs
]parsing [# Leaf 01H
]parsing [ 1, 0, EAX, 3:0, stepping, Stepping ID
]parsing [ 1, 0, EAX, 7:4, model, Model
]parsing [ 1, 0, EAX, 11:8, family, Family ID
]parsing [ 1, 0, EAX, 13:12, processor, Processor Type
]parsing [ 1, 0, EAX, 19:16, model_ext, Extended Model ID
]parsing [ 1, 0, EAX, 27:20, family_ext, Extended Family ID
]parsing [
]parsing [ 1, 0, EBX, 7:0, brand, Brand Index
]parsing [ 1, 0, EBX, 15:8, clflush_size, CLFLUSH line size (value * 8) in bytes
]parsing [ 1, 0, EBX, 23:16, max_cpu_id, Maxim number of addressable logic cpu in this package
]parsing [ 1, 0, EBX, 31:24, apic_id, Initial APIC ID
]parsing [
]parsing [ 1, 0, ECX, 0, sse3, Streaming SIMD Extensions 3(SSE3)
]parsing [ 1, 0, ECX, 1, pclmulqdq, PCLMULQDQ instruction supported
]parsing [ 1, 0, ECX, 2, dtes64, DS area uses 64-bit layout
]parsing [ 1, 0, ECX, 3, mwait, MONITOR/MWAIT supported
]parsing [ 1, 0, ECX, 4, ds_cpl, CPL Qualified Debug Store which allows for branch message storage qualified by CPL
]parsing [ 1, 0, ECX, 5, vmx, Virtual Machine Extensions supported
]parsing [ 1, 0, ECX, 6, smx, Safer Mode Extension supported
]parsing [ 1, 0, ECX, 7, eist, Enhanced Intel SpeedStep Technology
]parsing [ 1, 0, ECX, 8, tm2, Thermal Monitor 2
]parsing [ 1, 0, ECX, 9, ssse3, Supplemental Streaming SIMD Extensions 3 (SSSE3)
]parsing [ 1, 0, ECX, 10, l1_ctx_id, L1 data cache could be set to either adaptive mode or shared mode (check IA32_MISC_ENABLE bit 24 definition)
]parsing [ 1, 0, ECX, 11, sdbg, IA32_DEBUG_INTERFACE MSR for silicon debug supported
]parsing [ 1, 0, ECX, 12, fma, FMA extensions using YMM state supported
]parsing [ 1, 0, ECX, 13, cmpxchg16b, 'CMPXCHG16B - Compare and Exchange Bytes' supported
]parsing [ 1, 0, ECX, 14, xtpr_update, xTPR Update Control supported
]parsing [ 1, 0, ECX, 15, pdcm, Perfmon and Debug Capability present
]parsing [ 1, 0, ECX, 17, pcid, Process-Context Identifiers feature present
]parsing [ 1, 0, ECX, 18, dca, Prefetching data from a memory mapped device supported
]parsing [ 1, 0, ECX, 19, sss4_1, SSE4.1 feature present
]parsing [ 1, 0, ECX, 20, sse4_2, SSE4.2 feature present
]parsing [ 1, 0, ECX, 21, x2apic, x2APIC supported
]parsing [ 1, 0, ECX, 22, movbe, MOVBE instruction supported
]parsing [ 1, 0, ECX, 23, popcnt, POPCNT instruction supported
]parsing [ 1, 0, ECX, 24, tsc_deadline_timer, LAPIC supports one-shot operation using a TSC deadline value
]parsing [ 1, 0, ECX, 25, aesni, AESNI instruction supported
]parsing [ 1, 0, ECX, 26, xsave, XSAVE/XRSTOR processor extended states (XSETBV/XGETBV/XCR0)
]parsing [ 1, 0, ECX, 27, osxsave, OS has set CR4.OSXSAVE bit to enable XSETBV/XGETBV/XCR0
]parsing [ 1, 0, ECX, 28, avx, AVX instruction supported
]parsing [ 1, 0, ECX, 29, f16c, 16-bit floating-point conversion instruction supported
]parsing [ 1, 0, ECX, 30, rdrand, RDRAND instruction supported
]parsing [
]parsing [#
]parsing [# !!! Test data for testing different options, will be updated in formal version
]parsing [#
]parsing [ 4, 0, ECX, 1, aaa, AAA
Segmentation fault
$
Thx.
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
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