Re: [PATCH v5] tools/x86: Add a kcpuid tool to show raw CPU features
On Fri, Mar 05, 2021 at 03:21:18PM +0800, Feng Tang wrote: > End users frequently want to know what features their processor > supports, independent of what the kernel supports. Did some cleanups and improvements on top and I think we're ready to go. I'll queue it soon if no-one complains. --- From: Feng Tang Date: Fri, 5 Mar 2021 15:21:18 +0800 Subject: [PATCH] tools/x86: Add a kcpuid tool to show raw CPU features MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit End users frequently want to know what features their processor supports, independent of what the kernel supports. /proc/cpuinfo is great. It is omnipresent and since it is provided by the kernel it is always as up to date as the kernel. But, it could be ambiguous about processor features which can be disabled by the kernel at boot-time or compile-time. There are some user space tools showing more raw features, but they are not bound with kernel, and go with distros. Many end users are still using old distros with new kernels (upgraded by themselves), and may not upgrade the distros only to get a newer tool. So here arise the need for a new tool, which * shows raw CPU features read from the CPUID instruction * will be easier to update compared to existing userspace tooling (perhaps distributed like perf) * inherits "modern" kernel development process, in contrast to some of the existing userspace CPUID tools which are still being developed without git and distributed in tarballs from non-https sites. * Can produce output consistent with /proc/cpuinfo to make comparison easier. The CPUID leaf definitions are kept in an .csv file which allows for updating only that file to add support for new feature leafs. This is based on prototype code from Borislav Petkov (http://sr71.net/~dave/intel/stupid-cpuid.c). [ bp: - Massage, add #define _GNU_SOURCE to fix implicit declaration of function ‘strcasestr' warning - remove superfluous newlines - fallback to cpuid.csv in the current dir if none found - fix typos - move comments over the lines instead of sideways. ] Originally-from: Borislav Petkov Suggested-by: Dave Hansen Suggested-by: Borislav Petkov Signed-off-by: Feng Tang Signed-off-by: Borislav Petkov Link: https://lkml.kernel.org/r/1614928878-86075-1-git-send-email-feng.t...@intel.com --- tools/arch/x86/kcpuid/Makefile | 24 ++ tools/arch/x86/kcpuid/cpuid.csv | 380 ++ tools/arch/x86/kcpuid/kcpuid.c | 655 3 files changed, 1059 insertions(+) create mode 100644 tools/arch/x86/kcpuid/Makefile create mode 100644 tools/arch/x86/kcpuid/cpuid.csv create mode 100644 tools/arch/x86/kcpuid/kcpuid.c diff --git a/tools/arch/x86/kcpuid/Makefile b/tools/arch/x86/kcpuid/Makefile new file mode 100644 index ..87b554fab14b --- /dev/null +++ b/tools/arch/x86/kcpuid/Makefile @@ -0,0 +1,24 @@ +# SPDX-License-Identifier: GPL-2.0 +# Makefile for x86/kcpuid tool + +kcpuid : kcpuid.c + +CFLAGS = -Wextra + +BINDIR ?= /usr/sbin + +HWDATADIR ?= /usr/share/misc/ + +override CFLAGS += -O2 -Wall -I../../../include + +%: %.c + $(CC) $(CFLAGS) -o $@ $< $(LDFLAGS) + +.PHONY : clean +clean : + @rm -f kcpuid + +install : kcpuid + install -d $(DESTDIR)$(BINDIR) + install -m 755 -p kcpuid $(DESTDIR)$(BINDIR)/kcpuid + install -m 444 -p cpuid.csv $(HWDATADIR)/cpuid.csv diff --git a/tools/arch/x86/kcpuid/cpuid.csv b/tools/arch/x86/kcpuid/cpuid.csv new file mode 100644 index ..f4a5b85073f4 --- /dev/null +++ b/tools/arch/x86/kcpuid/cpuid.csv @@ -0,0 +1,380 @@ +# The basic row format is: +# LEAF, SUBLEAF, register_name, bits, short_name, long_description + +# Leaf 00H + 0,0, EAX, 31:0, max_basic_leafs, Max input value for supported subleafs + +# Leaf 01H + 1,0, EAX,3:0, stepping, Stepping ID + 1,0, EAX,7:4, model, Model + 1,0, EAX, 11:8, family, Family ID + 1,0, EAX, 13:12, processor, Processor Type + 1,0, EAX, 19:16, model_ext, Extended Model ID + 1,0, EAX, 27:20, family_ext, Extended Family ID + + 1,0, EBX,7:0, brand, Brand Index + 1,0, EBX, 15:8, clflush_size, CLFLUSH line size (value * 8) in bytes + 1,0, EBX, 23:16, max_cpu_id, Maxim number of addressable logic cpu in this package + 1,0, EBX, 31:24, apic_id, Initial APIC ID + + 1,0, ECX, 0, sse3, Streaming SIMD Extensions 3(SSE3) + 1,0, ECX, 1, pclmulqdq, PCLMULQDQ instruction supported + 1,0, ECX, 2, dtes64, DS area uses 64-bit layout + 1,0, ECX, 3, mwait, MONITOR/MWAIT supported + 1,0, ECX, 4, ds_cpl, CPL Qualified Debug Store which allows for branch message storage qualified by CPL + 1,0, ECX, 5, vmx, Virtual Machine Extensions supported + 1,0
[PATCH v5] tools/x86: Add a kcpuid tool to show raw CPU features
End users frequently want to know what features their processor supports, independent of what the kernel supports. /proc/cpuinfo is great. It is omnipresent and since it is provided by the kernel it is always as up to date as the kernel. But, it could be ambiguous about processor features which can be disabled by the kernel at boot-time or compile-time. There are some user space tools showing more raw features, but they are not bound with kernel, and go with distros. Many end users are still using old distros with new kernels (upgraded by themselves), and may not upgrade the distros only to get a newer tool. So here arise the need for a new tool, which * shows raw CPU features read from the CPUID instruction * will be easier to update compared to existing userspace tooling (perhaps distributed like perf) * inherits "modern" kernel development process, in contrast to some of the existing userspace CPUID tools which are still being developed without git and distributed in tarballs from non-https sites. * Can produce output consistent with /proc/cpuinfo to make comparison easier. The CPUID leaf definitions are kept in an .csv file which allows for updating only that file to add support for new feature leafs. This is based on prototype code from Borislav Petkov (http://sr71.net/~dave/intel/stupid-cpuid.c). [ bp: Massage, add #define _GNU_SOURCE to fix implicit declaration of function ‘strcasestr' warning. ] Originally-from: Borislav Petkov Suggested-by: Dave Hansen Suggested-by: Borislav Petkov Signed-off-by: Feng Tang Signed-off-by: Borislav Petkov Link: https://lkml.kernel.org/r/1603344083-100742-1-git-send-email-feng.t...@intel.com --- Changelog: v5: * rebased against v5.11 * fix a buffer overflow issue in v4 v4: * rebase against 5.11-rc4 * Boris helped to find and fix a segmentation fault and one compile warning * add more cpuid info into cpuid.csv * will show boolean bit flags only by default * some code cleanup v3: * use .csv file instead of plain text file which also uses comma to separate fields (Borislav) * add option to support a user specified .csv file (Dave) * make install will put the csv file under /usr/share/hwdata/ (Dave) v2: * use a new text file to store all the bits definition of each CPUID leaf/subleafs, which is easier for future expansion, as the core .c file will be kept untouched, suggested by Borislav/Dave * some code cleanup tools/arch/x86/kcpuid/Makefile | 24 ++ tools/arch/x86/kcpuid/cpuid.csv | 380 +++ tools/arch/x86/kcpuid/kcpuid.c | 646 3 files changed, 1050 insertions(+) create mode 100644 tools/arch/x86/kcpuid/Makefile create mode 100644 tools/arch/x86/kcpuid/cpuid.csv create mode 100644 tools/arch/x86/kcpuid/kcpuid.c diff --git a/tools/arch/x86/kcpuid/Makefile b/tools/arch/x86/kcpuid/Makefile new file mode 100644 index 000..87b554f --- /dev/null +++ b/tools/arch/x86/kcpuid/Makefile @@ -0,0 +1,24 @@ +# SPDX-License-Identifier: GPL-2.0 +# Makefile for x86/kcpuid tool + +kcpuid : kcpuid.c + +CFLAGS = -Wextra + +BINDIR ?= /usr/sbin + +HWDATADIR ?= /usr/share/misc/ + +override CFLAGS += -O2 -Wall -I../../../include + +%: %.c + $(CC) $(CFLAGS) -o $@ $< $(LDFLAGS) + +.PHONY : clean +clean : + @rm -f kcpuid + +install : kcpuid + install -d $(DESTDIR)$(BINDIR) + install -m 755 -p kcpuid $(DESTDIR)$(BINDIR)/kcpuid + install -m 444 -p cpuid.csv $(HWDATADIR)/cpuid.csv diff --git a/tools/arch/x86/kcpuid/cpuid.csv b/tools/arch/x86/kcpuid/cpuid.csv new file mode 100644 index 000..f4a5b85 --- /dev/null +++ b/tools/arch/x86/kcpuid/cpuid.csv @@ -0,0 +1,380 @@ +# The basic row format is: +# LEAF, SUBLEAF, register_name, bits, short_name, long_description + +# Leaf 00H + 0,0, EAX, 31:0, max_basic_leafs, Max input value for supported subleafs + +# Leaf 01H + 1,0, EAX,3:0, stepping, Stepping ID + 1,0, EAX,7:4, model, Model + 1,0, EAX, 11:8, family, Family ID + 1,0, EAX, 13:12, processor, Processor Type + 1,0, EAX, 19:16, model_ext, Extended Model ID + 1,0, EAX, 27:20, family_ext, Extended Family ID + + 1,0, EBX,7:0, brand, Brand Index + 1,0, EBX, 15:8, clflush_size, CLFLUSH line size (value * 8) in bytes + 1,0, EBX, 23:16, max_cpu_id, Maxim number of addressable logic cpu in this package + 1,0, EBX, 31:24, apic_id, Initial APIC ID + + 1,0, ECX, 0, sse3, Streaming SIMD Extensions 3(SSE3) + 1,0, ECX, 1, pclmulqdq, PCLMULQDQ instruction supported + 1,0, ECX, 2, dtes64, DS area uses 64-bit layout + 1,0, ECX, 3, mwait, MONITOR/MWAIT supported + 1,0, ECX, 4, ds_cpl, CPL Qualified Debug Store which allows for branch message storage qualified by CPL
