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Ravi Bangoria 35db59fa8e perf test amd ibs: Add sample period unit test 
IBS Fetch and IBS Op PMUs has various constraints on supported sample
periods. Add perf unit tests to test those.

Running it in parallel with other tests causes intermittent failures.
Mark it exclusive to force it to run sequentially. Sample output on a
Zen5 machine:

Without kernel fixes:

  $ sudo ./perf test -vv 112
  112: AMD IBS sample period:
  --- start ---
  test child forked, pid 8774
  Using CPUID AuthenticAMD-26-2-1

  IBS config tests:
  -----------------
  Fetch PMU tests:
  0xffff            : Ok   (nr samples: 1078)
  0x1000            : Ok   (nr samples: 17030)
  0xff              : Ok   (nr samples: 41068)
  0x1               : Ok   (nr samples: 40543)
  0x0               : Ok
  0x10000           : Ok
  Op PMU tests:
  0x0               : Ok
  0x1               : Fail
  0x8               : Fail
  0x9               : Ok   (nr samples: 40543)
  0xf               : Ok   (nr samples: 40543)
  0x1000            : Ok   (nr samples: 18736)
  0xffff            : Ok   (nr samples: 1168)
  0x10000           : Ok
  0x100000          : Fail (nr samples: 14)
  0xf00000          : Fail (nr samples: 1)
  0xf0ffff          : Fail (nr samples: 1)
  0x1f0ffff         : Fail (nr samples: 1)
  0x7f0ffff         : Fail (nr samples: 0)
  0x8f0ffff         : Ok
  0x17f0ffff        : Ok

  IBS sample period constraint tests:
  -----------------------------------
  Fetch PMU test:
  freq 0, sample_freq         0: Ok
  freq 0, sample_freq         1: Fail
  freq 0, sample_freq        15: Fail
  freq 0, sample_freq        16: Ok   (nr samples: 1604)
  freq 0, sample_freq        17: Ok   (nr samples: 1604)
  freq 0, sample_freq       143: Ok   (nr samples: 1604)
  freq 0, sample_freq       144: Ok   (nr samples: 1604)
  freq 0, sample_freq       145: Ok   (nr samples: 1604)
  freq 0, sample_freq      1234: Ok   (nr samples: 1566)
  freq 0, sample_freq      4103: Ok   (nr samples: 1119)
  freq 0, sample_freq     65520: Ok   (nr samples: 2264)
  freq 0, sample_freq     65535: Ok   (nr samples: 2263)
  freq 0, sample_freq     65552: Ok   (nr samples: 1166)
  freq 0, sample_freq   8388607: Ok   (nr samples: 268)
  freq 0, sample_freq 268435455: Ok   (nr samples: 8)
  freq 1, sample_freq         0: Ok
  freq 1, sample_freq         1: Ok   (nr samples: 4)
  freq 1, sample_freq        15: Ok   (nr samples: 4)
  freq 1, sample_freq        16: Ok   (nr samples: 4)
  freq 1, sample_freq        17: Ok   (nr samples: 4)
  freq 1, sample_freq       143: Ok   (nr samples: 5)
  freq 1, sample_freq       144: Ok   (nr samples: 5)
  freq 1, sample_freq       145: Ok   (nr samples: 5)
  freq 1, sample_freq      1234: Ok   (nr samples: 7)
  freq 1, sample_freq      4103: Ok   (nr samples: 35)
  freq 1, sample_freq     65520: Ok   (nr samples: 642)
  freq 1, sample_freq     65535: Ok   (nr samples: 636)
  freq 1, sample_freq     65552: Ok   (nr samples: 651)
  freq 1, sample_freq   8388607: Ok
  Op PMU test:
  freq 0, sample_freq         0: Ok
  freq 0, sample_freq         1: Fail
  freq 0, sample_freq        15: Fail
  freq 0, sample_freq        16: Fail
  freq 0, sample_freq        17: Fail
  freq 0, sample_freq       143: Fail
  freq 0, sample_freq       144: Ok   (nr samples: 1604)
  freq 0, sample_freq       145: Ok   (nr samples: 1604)
  freq 0, sample_freq      1234: Ok   (nr samples: 1604)
  freq 0, sample_freq      4103: Ok   (nr samples: 1604)
  freq 0, sample_freq     65520: Ok   (nr samples: 2227)
  freq 0, sample_freq     65535: Ok   (nr samples: 2296)
  freq 0, sample_freq     65552: Ok   (nr samples: 2213)
  freq 0, sample_freq   8388607: Ok   (nr samples: 250)
  freq 0, sample_freq 268435455: Ok   (nr samples: 8)
  freq 1, sample_freq         0: Ok
  freq 1, sample_freq         1: Fail (nr samples: 4)
  freq 1, sample_freq        15: Fail (nr samples: 4)
  freq 1, sample_freq        16: Fail (nr samples: 4)
  freq 1, sample_freq        17: Fail (nr samples: 4)
  freq 1, sample_freq       143: Fail (nr samples: 5)
  freq 1, sample_freq       144: Fail (nr samples: 5)
  freq 1, sample_freq       145: Fail (nr samples: 5)
  freq 1, sample_freq      1234: Fail (nr samples: 8)
  freq 1, sample_freq      4103: Fail (nr samples: 33)
  freq 1, sample_freq     65520: Fail (nr samples: 546)
  freq 1, sample_freq     65535: Fail (nr samples: 544)
  freq 1, sample_freq     65552: Fail (nr samples: 555)
  freq 1, sample_freq   8388607: Ok

  IBS ioctl() tests:
  ------------------
  Fetch PMU tests
  ioctl(period = 0x0      ): Ok
  ioctl(period = 0x1      ): Fail
  ioctl(period = 0xf      ): Fail
  ioctl(period = 0x10     ): Ok
  ioctl(period = 0x11     ): Fail
  ioctl(period = 0x1f     ): Fail
  ioctl(period = 0x20     ): Ok
  ioctl(period = 0x80     ): Ok
  ioctl(period = 0x8f     ): Fail
  ioctl(period = 0x90     ): Ok
  ioctl(period = 0x91     ): Fail
  ioctl(period = 0x100    ): Ok
  ioctl(period = 0xfff0   ): Ok
  ioctl(period = 0xffff   ): Fail
  ioctl(period = 0x10000  ): Ok
  ioctl(period = 0x1fff0  ): Ok
  ioctl(period = 0x1fff5  ): Fail
  ioctl(freq   = 0x0      ): Ok
  ioctl(freq   = 0x1      ): Ok
  ioctl(freq   = 0xf      ): Ok
  ioctl(freq   = 0x10     ): Ok
  ioctl(freq   = 0x11     ): Ok
  ioctl(freq   = 0x1f     ): Ok
  ioctl(freq   = 0x20     ): Ok
  ioctl(freq   = 0x80     ): Ok
  ioctl(freq   = 0x8f     ): Ok
  ioctl(freq   = 0x90     ): Ok
  ioctl(freq   = 0x91     ): Ok
  ioctl(freq   = 0x100    ): Ok
  Op PMU tests
  ioctl(period = 0x0      ): Ok
  ioctl(period = 0x1      ): Fail
  ioctl(period = 0xf      ): Fail
  ioctl(period = 0x10     ): Fail
  ioctl(period = 0x11     ): Fail
  ioctl(period = 0x1f     ): Fail
  ioctl(period = 0x20     ): Fail
  ioctl(period = 0x80     ): Fail
  ioctl(period = 0x8f     ): Fail
  ioctl(period = 0x90     ): Ok
  ioctl(period = 0x91     ): Fail
  ioctl(period = 0x100    ): Ok
  ioctl(period = 0xfff0   ): Ok
  ioctl(period = 0xffff   ): Fail
  ioctl(period = 0x10000  ): Ok
  ioctl(period = 0x1fff0  ): Ok
  ioctl(period = 0x1fff5  ): Fail
  ioctl(freq   = 0x0      ): Ok
  ioctl(freq   = 0x1      ): Ok
  ioctl(freq   = 0xf      ): Ok
  ioctl(freq   = 0x10     ): Ok
  ioctl(freq   = 0x11     ): Ok
  ioctl(freq   = 0x1f     ): Ok
  ioctl(freq   = 0x20     ): Ok
  ioctl(freq   = 0x80     ): Ok
  ioctl(freq   = 0x8f     ): Ok
  ioctl(freq   = 0x90     ): Ok
  ioctl(freq   = 0x91     ): Ok
  ioctl(freq   = 0x100    ): Ok

  IBS freq (negative) tests:
  --------------------------
  freq 1, sample_freq 200000: Fail

  IBS L3MissOnly test: (takes a while)
  --------------------
  Fetch L3MissOnly: Fail (nr_samples: 1213)
  Op L3MissOnly:    Ok   (nr_samples: 1193)
  ---- end(-1) ----
  112: AMD IBS sample period                                           : FAILED!

With kernel fixes:

  $ sudo ./perf test -vv 112
  112: AMD IBS sample period:
  --- start ---
  test child forked, pid 6939
  Using CPUID AuthenticAMD-26-2-1

  IBS config tests:
  -----------------
  Fetch PMU tests:
  0xffff            : Ok   (nr samples: 969)
  0x1000            : Ok   (nr samples: 15540)
  0xff              : Ok   (nr samples: 40555)
  0x1               : Ok   (nr samples: 40543)
  0x0               : Ok
  0x10000           : Ok
  Op PMU tests:
  0x0               : Ok
  0x1               : Ok
  0x8               : Ok
  0x9               : Ok   (nr samples: 40543)
  0xf               : Ok   (nr samples: 40543)
  0x1000            : Ok   (nr samples: 19156)
  0xffff            : Ok   (nr samples: 1169)
  0x10000           : Ok
  0x100000          : Ok   (nr samples: 1151)
  0xf00000          : Ok   (nr samples: 76)
  0xf0ffff          : Ok   (nr samples: 73)
  0x1f0ffff         : Ok   (nr samples: 33)
  0x7f0ffff         : Ok   (nr samples: 10)
  0x8f0ffff         : Ok
  0x17f0ffff        : Ok

  IBS sample period constraint tests:
  -----------------------------------
  Fetch PMU test:
  freq 0, sample_freq         0: Ok
  freq 0, sample_freq         1: Ok
  freq 0, sample_freq        15: Ok
  freq 0, sample_freq        16: Ok   (nr samples: 1203)
  freq 0, sample_freq        17: Ok   (nr samples: 1604)
  freq 0, sample_freq       143: Ok   (nr samples: 1604)
  freq 0, sample_freq       144: Ok   (nr samples: 1604)
  freq 0, sample_freq       145: Ok   (nr samples: 1604)
  freq 0, sample_freq      1234: Ok   (nr samples: 1604)
  freq 0, sample_freq      4103: Ok   (nr samples: 1343)
  freq 0, sample_freq     65520: Ok   (nr samples: 2254)
  freq 0, sample_freq     65535: Ok   (nr samples: 2136)
  freq 0, sample_freq     65552: Ok   (nr samples: 1158)
  freq 0, sample_freq   8388607: Ok   (nr samples: 257)
  freq 0, sample_freq 268435455: Ok   (nr samples: 8)
  freq 1, sample_freq         0: Ok
  freq 1, sample_freq         1: Ok   (nr samples: 4)
  freq 1, sample_freq        15: Ok   (nr samples: 4)
  freq 1, sample_freq        16: Ok   (nr samples: 4)
  freq 1, sample_freq        17: Ok   (nr samples: 4)
  freq 1, sample_freq       143: Ok   (nr samples: 5)
  freq 1, sample_freq       144: Ok   (nr samples: 5)
  freq 1, sample_freq       145: Ok   (nr samples: 5)
  freq 1, sample_freq      1234: Ok   (nr samples: 8)
  freq 1, sample_freq      4103: Ok   (nr samples: 34)
  freq 1, sample_freq     65520: Ok   (nr samples: 458)
  freq 1, sample_freq     65535: Ok   (nr samples: 628)
  freq 1, sample_freq     65552: Ok   (nr samples: 396)
  freq 1, sample_freq   8388607: Ok
  Op PMU test:
  freq 0, sample_freq         0: Ok
  freq 0, sample_freq         1: Ok
  freq 0, sample_freq        15: Ok
  freq 0, sample_freq        16: Ok
  freq 0, sample_freq        17: Ok
  freq 0, sample_freq       143: Ok
  freq 0, sample_freq       144: Ok   (nr samples: 1604)
  freq 0, sample_freq       145: Ok   (nr samples: 1604)
  freq 0, sample_freq      1234: Ok   (nr samples: 1604)
  freq 0, sample_freq      4103: Ok   (nr samples: 1604)
  freq 0, sample_freq     65520: Ok   (nr samples: 2250)
  freq 0, sample_freq     65535: Ok   (nr samples: 2158)
  freq 0, sample_freq     65552: Ok   (nr samples: 2296)
  freq 0, sample_freq   8388607: Ok   (nr samples: 243)
  freq 0, sample_freq 268435455: Ok   (nr samples: 6)
  freq 1, sample_freq         0: Ok
  freq 1, sample_freq         1: Ok   (nr samples: 4)
  freq 1, sample_freq        15: Ok   (nr samples: 4)
  freq 1, sample_freq        16: Ok   (nr samples: 4)
  freq 1, sample_freq        17: Ok   (nr samples: 4)
  freq 1, sample_freq       143: Ok   (nr samples: 4)
  freq 1, sample_freq       144: Ok   (nr samples: 5)
  freq 1, sample_freq       145: Ok   (nr samples: 4)
  freq 1, sample_freq      1234: Ok   (nr samples: 6)
  freq 1, sample_freq      4103: Ok   (nr samples: 27)
  freq 1, sample_freq     65520: Ok   (nr samples: 542)
  freq 1, sample_freq     65535: Ok   (nr samples: 550)
  freq 1, sample_freq     65552: Ok   (nr samples: 552)
  freq 1, sample_freq   8388607: Ok

  IBS ioctl() tests:
  ------------------
  Fetch PMU tests
  ioctl(period = 0x0      ): Ok
  ioctl(period = 0x1      ): Ok
  ioctl(period = 0xf      ): Ok
  ioctl(period = 0x10     ): Ok
  ioctl(period = 0x11     ): Ok
  ioctl(period = 0x1f     ): Ok
  ioctl(period = 0x20     ): Ok
  ioctl(period = 0x80     ): Ok
  ioctl(period = 0x8f     ): Ok
  ioctl(period = 0x90     ): Ok
  ioctl(period = 0x91     ): Ok
  ioctl(period = 0x100    ): Ok
  ioctl(period = 0xfff0   ): Ok
  ioctl(period = 0xffff   ): Ok
  ioctl(period = 0x10000  ): Ok
  ioctl(period = 0x1fff0  ): Ok
  ioctl(period = 0x1fff5  ): Ok
  ioctl(freq   = 0x0      ): Ok
  ioctl(freq   = 0x1      ): Ok
  ioctl(freq   = 0xf      ): Ok
  ioctl(freq   = 0x10     ): Ok
  ioctl(freq   = 0x11     ): Ok
  ioctl(freq   = 0x1f     ): Ok
  ioctl(freq   = 0x20     ): Ok
  ioctl(freq   = 0x80     ): Ok
  ioctl(freq   = 0x8f     ): Ok
  ioctl(freq   = 0x90     ): Ok
  ioctl(freq   = 0x91     ): Ok
  ioctl(freq   = 0x100    ): Ok
  Op PMU tests
  ioctl(period = 0x0      ): Ok
  ioctl(period = 0x1      ): Ok
  ioctl(period = 0xf      ): Ok
  ioctl(period = 0x10     ): Ok
  ioctl(period = 0x11     ): Ok
  ioctl(period = 0x1f     ): Ok
  ioctl(period = 0x20     ): Ok
  ioctl(period = 0x80     ): Ok
  ioctl(period = 0x8f     ): Ok
  ioctl(period = 0x90     ): Ok
  ioctl(period = 0x91     ): Ok
  ioctl(period = 0x100    ): Ok
  ioctl(period = 0xfff0   ): Ok
  ioctl(period = 0xffff   ): Ok
  ioctl(period = 0x10000  ): Ok
  ioctl(period = 0x1fff0  ): Ok
  ioctl(period = 0x1fff5  ): Ok
  ioctl(freq   = 0x0      ): Ok
  ioctl(freq   = 0x1      ): Ok
  ioctl(freq   = 0xf      ): Ok
  ioctl(freq   = 0x10     ): Ok
  ioctl(freq   = 0x11     ): Ok
  ioctl(freq   = 0x1f     ): Ok
  ioctl(freq   = 0x20     ): Ok
  ioctl(freq   = 0x80     ): Ok
  ioctl(freq   = 0x8f     ): Ok
  ioctl(freq   = 0x90     ): Ok
  ioctl(freq   = 0x91     ): Ok
  ioctl(freq   = 0x100    ): Ok

  IBS freq (negative) tests:
  --------------------------
  freq 1, sample_freq 200000: Ok

  IBS L3MissOnly test: (takes a while)
  --------------------
  Fetch L3MissOnly: Ok   (nr_samples: 1301)
  Op L3MissOnly:    Ok   (nr_samples: 1590)
  ---- end(0) ----
  112: AMD IBS sample period                                           : Ok

Committer notes:

Avoid using PAGE_SIZE as that define is also in sys/user.h

Make it a variable not to call sysconf() multiple times.

Also cast func to void * when passing it as the first arg to memcpy to
avoid this with some versions of clang:

  arch/x86/tests/amd-ibs-period.c:81:3: error: no matching function for call to 'memcpy'
                  memcpy(func, insn1, sizeof(insn1));
                  ^~~~~~
  /usr/include/string.h:27:7: note: candidate function not viable: no known conversion from 'int (*)(void)' to 'void *' for 1st argument
  void *memcpy (void *__restrict, const void *__restrict, size_t);
        ^
  /usr/include/fortify/string.h:40:27: note: candidate function not viable: no known conversion from 'int (*)(void)' to 'void *const' for 1st argument
  _FORTIFY_FN(memcpy) void *memcpy(void * _FORTIFY_POS0 __od,
                            ^
  arch/x86/tests/amd-ibs-period.c:87:3: error: no matching function for call to 'memcpy'

This one, for instance:

  Alpine clang version 19.1.4
  Target: x86_64-alpine-linux-musl
  Thread model: posix
  InstalledDir: /usr/lib/llvm19/bin
  Configuration file: /etc/clang19/x86_64-alpine-linux-musl.cfg
  System configuration file directory: /etc/clang19

Signed-off-by: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Ananth Narayan <ananth.narayan@amd.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Joe Mario <jmario@redhat.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sandipan Das <sandipan.das@amd.com>
Cc: Santosh Shukla <santosh.shukla@amd.com>
Cc: Stephane Eranian <eranian@google.com>
Link: https://lore.kernel.org/r/20250429035938.1301-5-ravi.bangoria@amd.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
 		2025-04-29 22:30:46 -03:00
Documentation A few more miscellaneous ext4 bug fixes and cleanups including some 2025-04-13 07:15:50 -07:00
LICENSES LICENSES: add 0BSD license text 2024-09-01 20:43:24 -07:00
arch bpf-fixes 2025-04-12 12:48:10 -07:00
block treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto This push fixes reverts the multibuffer hash testing as it is buggy. 2025-04-02 09:14:59 -07:00
drivers Two fixes to the AMD translation library for the MI300 side of things: 2025-04-15 08:26:33 -07:00
fs \n 2025-04-15 08:19:52 -07:00
include RDMA v6.15 first rc pull request 2025-04-14 10:24:04 -07:00
init Miscellaneous scheduler fixes/updates: 2025-04-06 10:44:58 -07:00
io_uring io_uring/kbuf: reject zero sized provided buffers 2025-04-07 07:51:23 -06:00
ipc treewide: const qualify ctl_tables where applicable 2025-01-28 13:48:37 +01:00
kernel tracing fixes for v6.15 2025-04-12 15:37:40 -07:00
lib CRC cleanups for 6.15 2025-04-08 12:09:28 -07:00
mm Disable SLUB_TINY for build testing 2025-04-06 10:00:04 -07:00
net bpf-fixes 2025-04-12 12:48:10 -07:00
rust Kbuild updates for v6.15 2025-04-05 15:46:50 -07:00
samples treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
scripts Disable SLUB_TINY for build testing 2025-04-06 10:00:04 -07:00
security mseal sysmap: kernel config and header change 2025-04-01 15:17:14 -07:00
sound soundwire fix for 6.15-rc1 2025-04-06 12:04:53 -07:00
tools perf test amd ibs: Add sample period unit test 2025-04-29 22:30:46 -03:00
usr kbuild: hdrcheck: fix cross build with clang 2025-03-05 04:06:45 +09:00
virt ARM: 2025-04-08 13:47:55 -07:00
.clang-format clang-format: Update with v6.11-rc1's `for_each` macro list 2024-08-02 13:20:31 +02:00
.clippy.toml rust: give Clippy the minimum supported Rust version 2025-01-10 00:17:25 +01:00
.cocciconfig
…
.editorconfig .editorconfig: remove trim_trailing_whitespace option 2024-06-13 16:47:52 +02:00
.get_maintainer.ignore MAINTAINERS: Retire Ralf Baechle 2024-11-12 15:48:59 +01:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore kbuild: Create intermediate vmlinux build with relocations preserved 2025-03-17 00:29:50 +09:00
.mailmap mailmap: add an entry for Nicolas Schier 2025-04-01 15:20:45 -07:00
.rustfmt.toml rust: add `.rustfmt.toml` 2022-09-28 09:02:20 +02:00
COPYING
…
CREDITS Including fixes from netfilter. 2025-04-04 09:15:35 -07:00
Kbuild drm: ensure drm headers are self-contained and pass kernel-doc 2025-02-12 10:44:43 +02:00
Kconfig io_uring: Rename KConfig to Kconfig 2025-02-19 14:53:27 -07:00
MAINTAINERS MAINTAINERS: Add hisilicon PMU JSON events under its entry 2025-04-25 12:32:23 -03:00
Makefile Linux 6.15-rc2 2025-04-13 11:54:49 -07:00
README README: Fix spelling 2024-03-18 03:36:32 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.