Hi all:
The core frequency is subjected to the process variation in semiconductors.
Not all cores are able to reach the maximum frequency respecting the
infrastructure limits. Consequently, AMD has redefined the concept of
maximum frequency of a part. This means that a fraction of cores can reach
maximum frequency. To find the best process scheduling policy for a given
scenario, OS needs to know the core ordering informed by the platform through
highest performance capability register of the CPPC interface.
Earlier implementations of amd-pstate preferred core only support a static
core ranking and targeted performance. Now it has the ability to dynamically
change the preferred core based on the workload and platform conditions and
accounting for thermals and aging.
Amd-pstate driver utilizes the functions and data structures provided by
the ITMT architecture to enable the scheduler to favor scheduling on cores
which can be get a higher frequency with lower voltage.
We call it amd-pstate preferred core.
Here sched_set_itmt_core_prio() is called to set priorities and
sched_set_itmt_support() is called to enable ITMT feature.
Amd-pstate driver uses the highest performance value to indicate
the priority of CPU. The higher value has a higher priority.
Amd-pstate driver will provide an initial core ordering at boot time.
It relies on the CPPC interface to communicate the core ranking to the
operating system and scheduler to make sure that OS is choosing the cores
with highest performance firstly for scheduling the process. When amd-pstate
driver receives a message with the highest performance change, it will
update the core ranking.
Changes from V12->V13:
- ACPI: CPPC:
- - modify commit message.
- - modify handle function of the notify(0x85).
- cpufreq: amd-pstate:
- - implement update_limits() callback function.
- x86:
- - pick up Acked-By flag added by Petkov.
Changes from V11->V12:
- all:
- - pick up Reviewed-By flag added by Perry.
- cpufreq: amd-pstate:
- - rebase the latest linux-next and fixed conflicts.
- - fixed the issue about cpudata without init in amd_pstate_update_highest_perf().
Changes from V10->V11:
- cpufreq: amd-pstate:
- - according Perry's commnts, I replace the string with str_enabled_disable().
Changes from V9->V10:
- cpufreq: amd-pstate:
- - add judgement for highest_perf. When it is less than 255, the
preferred core feature is enabled. And it will set the priority.
- - deleset "static u32 max_highest_perf" etc, because amd p-state
perferred coe does not require specail process for hotpulg.
Changes form V8->V9:
- all:
- - pick up Tested-By flag added by Oleksandr.
- cpufreq: amd-pstate:
- - pick up Review-By flag added by Wyes.
- - ignore modification of bug.
- - add a attribute of prefcore_ranking.
- - modify data type conversion from u32 to int.
- Documentation: amd-pstate:
- - pick up Review-By flag added by Wyes.
Changes form V7->V8:
- all:
- - pick up Review-By flag added by Mario and Ray.
- cpufreq: amd-pstate:
- - use hw_prefcore embeds into cpudata structure.
- - delete preferred core init from cpu online/off.
Changes form V6->V7:
- x86:
- - Modify kconfig about X86_AMD_PSTATE.
- cpufreq: amd-pstate:
- - modify incorrect comments about scheduler_work().
- - convert highest_perf data type.
- - modify preferred core init when cpu init and online.
- ACPI: CPPC:
- - modify link of CPPC highest performance.
- cpufreq:
- - modify link of CPPC highest performance changed.
Changes form V5->V6:
- cpufreq: amd-pstate:
- - modify the wrong tag order.
- - modify warning about hw_prefcore sysfs attribute.
- - delete duplicate comments.
- - modify the variable name cppc_highest_perf to prefcore_ranking.
- - modify judgment conditions for setting highest_perf.
- - modify sysfs attribute for CPPC highest perf to pr_debug message.
- Documentation: amd-pstate:
- - modify warning: title underline too short.
Changes form V4->V5:
- cpufreq: amd-pstate:
- - modify sysfs attribute for CPPC highest perf.
- - modify warning about comments
- - rebase linux-next
- cpufreq:
- - Moidfy warning about function declarations.
- Documentation: amd-pstate:
- - align with ``amd-pstat``
Changes form V3->V4:
- Documentation: amd-pstate:
- - Modify inappropriate descriptions.
Changes form V2->V3:
- x86:
- - Modify kconfig and description.
- cpufreq: amd-pstate:
- - Add Co-developed-by tag in commit message.
- cpufreq:
- - Modify commit message.
- Documentation: amd-pstate:
- - Modify inappropriate descriptions.
Changes form V1->V2:
- ACPI: CPPC:
- - Add reference link.
- cpufreq:
- - Moidfy link error.
- cpufreq: amd-pstate:
- - Init the priorities of all online CPUs
- - Use a single variable to represent the status of preferred core.
- Documentation:
- - Default enabled preferred core.
- Documentation: amd-pstate:
- - Modify inappropriate descriptions.
- - Default enabled preferred core.
- - Use a single variable to represent the status of preferred core.
*** BLURB HERE ***
Meng Li (7):
x86: Drop CPU_SUP_INTEL from SCHED_MC_PRIO for the expansion.
ACPI: CPPC: Add get the highest performance cppc control
cpufreq: amd-pstate: Enable amd-pstate preferred core supporting.
cpufreq: Add a notification message that the highest perf has changed
cpufreq: amd-pstate: Update amd-pstate preferred core ranking
dynamically
Documentation: amd-pstate: introduce amd-pstate preferred core
Documentation: introduce amd-pstate preferrd core mode kernel command
line options
.../admin-guide/kernel-parameters.txt | 5 +
Documentation/admin-guide/pm/amd-pstate.rst | 59 +++++-
arch/x86/Kconfig | 5 +-
drivers/acpi/cppc_acpi.c | 13 ++
drivers/acpi/processor_driver.c | 6 +
drivers/cpufreq/amd-pstate.c | 183 +++++++++++++++++-
include/acpi/cppc_acpi.h | 5 +
include/linux/amd-pstate.h | 10 +
8 files changed, 274 insertions(+), 12 deletions(-)
--
2.34.1
Add a test to exercize cpu hotplug with the function tracer active to
ensure that sensitive functions in idle path are excluded from being
traced. This helps catch issues such as the one fixed by commit
4b3338aaa74d ("powerpc/ftrace: Fix stack teardown in ftrace_no_trace").
Signed-off-by: Naveen N Rao <naveen(a)kernel.org>
---
v2: Add a check for next available online cpu, as suggested by Masami.
.../ftrace/test.d/ftrace/func_hotplug.tc | 42 +++++++++++++++++++
1 file changed, 42 insertions(+)
create mode 100644 tools/testing/selftests/ftrace/test.d/ftrace/func_hotplug.tc
diff --git a/tools/testing/selftests/ftrace/test.d/ftrace/func_hotplug.tc b/tools/testing/selftests/ftrace/test.d/ftrace/func_hotplug.tc
new file mode 100644
index 000000000000..ccfbfde3d942
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/ftrace/func_hotplug.tc
@@ -0,0 +1,42 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0-or-later
+# description: ftrace - function trace across cpu hotplug
+# requires: function:tracer
+
+if ! which nproc ; then
+ nproc() {
+ ls -d /sys/devices/system/cpu/cpu[0-9]* | wc -l
+ }
+fi
+
+NP=`nproc`
+
+if [ $NP -eq 1 ] ;then
+ echo "We cannot test cpu hotplug in UP environment"
+ exit_unresolved
+fi
+
+# Find online cpu
+for i in /sys/devices/system/cpu/cpu[1-9]*; do
+ if [ -f $i/online ] && [ "$(cat $i/online)" = "1" ]; then
+ cpu=$i
+ break
+ fi
+done
+
+if [ -z "$cpu" ]; then
+ echo "We cannot test cpu hotplug with a single cpu online"
+ exit_unresolved
+fi
+
+echo 0 > tracing_on
+echo > trace
+
+: "Set $(basename $cpu) offline/online with function tracer enabled"
+echo function > current_tracer
+echo 1 > tracing_on
+(echo 0 > $cpu/online)
+(echo "forked"; sleep 1)
+(echo 1 > $cpu/online)
+echo 0 > tracing_on
+echo nop > current_tracer
base-commit: b85ea95d086471afb4ad062012a4d73cd328fa86
--
2.43.0
Use 2 separate variables of types int and unsigned long long instead of
confusing them. This corrects the correct print format for each of them
and removes the build warning:
warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘long long unsigned int’
Fixes: a4cb3b243343 ("selftests: mm: add a test for remapping to area immediately after existing mapping")
Signed-off-by: Muhammad Usama Anjum <usama.anjum(a)collabora.com>
---
Changes since v1:
- Don't just fix the print format, instead use different variables
---
tools/testing/selftests/mm/mremap_test.c | 27 ++++++++++++------------
1 file changed, 14 insertions(+), 13 deletions(-)
diff --git a/tools/testing/selftests/mm/mremap_test.c b/tools/testing/selftests/mm/mremap_test.c
index 1d4c1589c305..2f8b991f78cb 100644
--- a/tools/testing/selftests/mm/mremap_test.c
+++ b/tools/testing/selftests/mm/mremap_test.c
@@ -360,7 +360,8 @@ static long long remap_region(struct config c, unsigned int threshold_mb,
char pattern_seed)
{
void *addr, *src_addr, *dest_addr, *dest_preamble_addr;
- unsigned long long i;
+ int d;
+ unsigned long long t;
struct timespec t_start = {0, 0}, t_end = {0, 0};
long long start_ns, end_ns, align_mask, ret, offset;
unsigned long long threshold;
@@ -378,8 +379,8 @@ static long long remap_region(struct config c, unsigned int threshold_mb,
/* Set byte pattern for source block. */
srand(pattern_seed);
- for (i = 0; i < threshold; i++)
- memset((char *) src_addr + i, (char) rand(), 1);
+ for (t = 0; t < threshold; t++)
+ memset((char *) src_addr + t, (char) rand(), 1);
/* Mask to zero out lower bits of address for alignment */
align_mask = ~(c.dest_alignment - 1);
@@ -420,8 +421,8 @@ static long long remap_region(struct config c, unsigned int threshold_mb,
/* Set byte pattern for the dest preamble block. */
srand(pattern_seed);
- for (i = 0; i < c.dest_preamble_size; i++)
- memset((char *) dest_preamble_addr + i, (char) rand(), 1);
+ for (d = 0; d < c.dest_preamble_size; d++)
+ memset((char *) dest_preamble_addr + d, (char) rand(), 1);
}
clock_gettime(CLOCK_MONOTONIC, &t_start);
@@ -437,14 +438,14 @@ static long long remap_region(struct config c, unsigned int threshold_mb,
/* Verify byte pattern after remapping */
srand(pattern_seed);
- for (i = 0; i < threshold; i++) {
+ for (t = 0; t < threshold; t++) {
char c = (char) rand();
- if (((char *) dest_addr)[i] != c) {
+ if (((char *) dest_addr)[t] != c) {
ksft_print_msg("Data after remap doesn't match at offset %llu\n",
- i);
+ t);
ksft_print_msg("Expected: %#x\t Got: %#x\n", c & 0xff,
- ((char *) dest_addr)[i] & 0xff);
+ ((char *) dest_addr)[t] & 0xff);
ret = -1;
goto clean_up_dest;
}
@@ -453,14 +454,14 @@ static long long remap_region(struct config c, unsigned int threshold_mb,
/* Verify the dest preamble byte pattern after remapping */
if (c.dest_preamble_size) {
srand(pattern_seed);
- for (i = 0; i < c.dest_preamble_size; i++) {
+ for (d = 0; d < c.dest_preamble_size; d++) {
char c = (char) rand();
- if (((char *) dest_preamble_addr)[i] != c) {
+ if (((char *) dest_preamble_addr)[d] != c) {
ksft_print_msg("Preamble data after remap doesn't match at offset %d\n",
- i);
+ d);
ksft_print_msg("Expected: %#x\t Got: %#x\n", c & 0xff,
- ((char *) dest_preamble_addr)[i] & 0xff);
+ ((char *) dest_preamble_addr)[d] & 0xff);
ret = -1;
goto clean_up_dest;
}
--
2.42.0
Fix following build warning:
warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘long long unsigned int’
Fixes: a4cb3b243343 ("selftests: mm: add a test for remapping to area immediately after existing mapping")
Signed-off-by: Muhammad Usama Anjum <usama.anjum(a)collabora.com>
---
tools/testing/selftests/mm/mremap_test.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/testing/selftests/mm/mremap_test.c b/tools/testing/selftests/mm/mremap_test.c
index 1d4c1589c305..dd1cbb068982 100644
--- a/tools/testing/selftests/mm/mremap_test.c
+++ b/tools/testing/selftests/mm/mremap_test.c
@@ -457,7 +457,7 @@ static long long remap_region(struct config c, unsigned int threshold_mb,
char c = (char) rand();
if (((char *) dest_preamble_addr)[i] != c) {
- ksft_print_msg("Preamble data after remap doesn't match at offset %d\n",
+ ksft_print_msg("Preamble data after remap doesn't match at offset %llu\n",
i);
ksft_print_msg("Expected: %#x\t Got: %#x\n", c & 0xff,
((char *) dest_preamble_addr)[i] & 0xff);
--
2.42.0
From: Christoph Müllner <christoph.muellner(a)vrull.eu>
When building the RISC-V selftests with a riscv32 compiler I ran into
a couple of compiler warnings. While riscv32 support for these tests is
questionable, the fixes are so trivial that it is probably best to simply
apply them.
Note that the missing-include patch and some format string warnings
are also relevant for riscv64.
Christoph Müllner (5):
tools: selftests: riscv: Fix compile warnings in hwprobe
tools: selftests: riscv: Fix compile warnings in cbo
tools: selftests: riscv: Add missing include for vector test
tools: selftests: riscv: Fix compile warnings in vector tests
tools: selftests: riscv: Fix compile warnings in mm tests
tools/testing/selftests/riscv/hwprobe/cbo.c | 6 +++---
tools/testing/selftests/riscv/hwprobe/hwprobe.c | 4 ++--
tools/testing/selftests/riscv/mm/mmap_test.h | 3 +++
tools/testing/selftests/riscv/vector/v_initval_nolibc.c | 2 +-
tools/testing/selftests/riscv/vector/vstate_exec_nolibc.c | 3 +++
tools/testing/selftests/riscv/vector/vstate_prctl.c | 4 ++--
6 files changed, 14 insertions(+), 8 deletions(-)
--
2.41.0
When execute the dirty_log_test on some aarch64 machine, it sometimes
trigger the ASSERT:
==== Test Assertion Failure ====
dirty_log_test.c:384: dirty_ring_vcpu_ring_full
pid=14854 tid=14854 errno=22 - Invalid argument
1 0x00000000004033eb: dirty_ring_collect_dirty_pages at dirty_log_test.c:384
2 0x0000000000402d27: log_mode_collect_dirty_pages at dirty_log_test.c:505
3 (inlined by) run_test at dirty_log_test.c:802
4 0x0000000000403dc7: for_each_guest_mode at guest_modes.c:100
5 0x0000000000401dff: main at dirty_log_test.c:941 (discriminator 3)
6 0x0000ffff9be173c7: ?? ??:0
7 0x0000ffff9be1749f: ?? ??:0
8 0x000000000040206f: _start at ??:?
Didn't continue vcpu even without ring full
The dirty_log_test fails when execute the dirty-ring test, this is
because the sem_vcpu_cont and the sem_vcpu_stop is non-zero value when
execute the dirty_ring_collect_dirty_pages() function. When those two
sem_t variables are non-zero, the dirty_ring_wait_vcpu() at the
beginning of the dirty_ring_collect_dirty_pages() will not wait for the
vcpu to stop, but continue to execute the following code. In this case,
before vcpu stop, if the dirty_ring_vcpu_ring_full is true, and the
dirty_ring_collect_dirty_pages() has passed the check for the
dirty_ring_vcpu_ring_full but hasn't execute the check for the
continued_vcpu, the vcpu stop, and set the dirty_ring_vcpu_ring_full to
false. Then dirty_ring_collect_dirty_pages() will trigger the ASSERT.
Why sem_vcpu_cont and sem_vcpu_stop can be non-zero value? It's because
the dirty_ring_before_vcpu_join() execute the sem_post(&sem_vcpu_cont)
at the end of each dirty-ring test. It can cause two cases:
1. sem_vcpu_cont be non-zero. When we set the host_quit to be true,
the vcpu_worker directly see the host_quit to be true, it quit. So
the log_mode_before_vcpu_join() function will set the sem_vcpu_cont
to 1, since the vcpu_worker has quit, it won't consume it.
2. sem_vcpu_stop be non-zero. When we set the host_quit to be true,
the vcpu_worker has entered the guest state, the next time it exit
from guest state, it will set the sem_vcpu_stop to 1, and then see
the host_quit, no one will consume the sem_vcpu_stop.
When execute more and more dirty-ring tests, the sem_vcpu_cont and
sem_vcpu_stop can be larger and larger, which makes many code paths
don't wait for the sem_t. Thus finally cause the problem.
To fix this problem, we can wait a while before set the host_quit to
true, which gives the vcpu time to enter the guest state, so it will
exit again. Then we can wait the vcpu to exit, and let it continue
again, then the vcpu will see the host_quit. Thus the sem_vcpu_cont and
sem_vcpu_stop will be both zero when test finished.
Signed-off-by: Shaoqin Huang <shahuang(a)redhat.com>
---
v1->v2:
- Fix the real logic bug, not just fresh the context.
v1: https://lore.kernel.org/all/20231116093536.22256-1-shahuang@redhat.com/
---
tools/testing/selftests/kvm/dirty_log_test.c | 16 +++++++++++++++-
1 file changed, 15 insertions(+), 1 deletion(-)
diff --git a/tools/testing/selftests/kvm/dirty_log_test.c b/tools/testing/selftests/kvm/dirty_log_test.c
index 936f3a8d1b83..a6e0ff46a07c 100644
--- a/tools/testing/selftests/kvm/dirty_log_test.c
+++ b/tools/testing/selftests/kvm/dirty_log_test.c
@@ -417,7 +417,8 @@ static void dirty_ring_after_vcpu_run(struct kvm_vcpu *vcpu, int ret, int err)
static void dirty_ring_before_vcpu_join(void)
{
- /* Kick another round of vcpu just to make sure it will quit */
+ /* Wait vcpu exit, and let it continue to see the host_quit. */
+ dirty_ring_wait_vcpu();
sem_post(&sem_vcpu_cont);
}
@@ -719,6 +720,7 @@ static void run_test(enum vm_guest_mode mode, void *arg)
struct kvm_vm *vm;
unsigned long *bmap;
uint32_t ring_buf_idx = 0;
+ int sem_val;
if (!log_mode_supported()) {
print_skip("Log mode '%s' not supported",
@@ -726,6 +728,11 @@ static void run_test(enum vm_guest_mode mode, void *arg)
return;
}
+ sem_getvalue(&sem_vcpu_stop, &sem_val);
+ assert(sem_val == 0);
+ sem_getvalue(&sem_vcpu_cont, &sem_val);
+ assert(sem_val == 0);
+
/*
* We reserve page table for 2 times of extra dirty mem which
* will definitely cover the original (1G+) test range. Here
@@ -825,6 +832,13 @@ static void run_test(enum vm_guest_mode mode, void *arg)
sync_global_to_guest(vm, iteration);
}
+ /*
+ *
+ * Before we set the host_quit, let the vcpu has time to run, to make
+ * sure we consume the sem_vcpu_stop and the vcpu consume the
+ * sem_vcpu_cont, to keep the semaphore balance.
+ */
+ usleep(p->interval * 1000);
/* Tell the vcpu thread to quit */
host_quit = true;
log_mode_before_vcpu_join();
--
2.40.1
Now that we have the VISIBLE_IF_KUNIT and EXPORT_SYMBOL_IF_KUNIT macros,
update the instructions to recommend this way of testing static
functions.
Signed-off-by: Arthur Grillo <arthurgrillo(a)riseup.net>
---
Changes in v3:
- Maintain the old '#include' way
- Link to v2: https://lore.kernel.org/r/20240108-kunit-doc-export-v2-1-8f2dd3395fed@riseu…
Changes in v2:
- Fix #if condition
- Link to v1: https://lore.kernel.org/r/20240108-kunit-doc-export-v1-1-119368df0d96@riseu…
---
Documentation/dev-tools/kunit/usage.rst | 19 +++++++++++++++++--
1 file changed, 17 insertions(+), 2 deletions(-)
diff --git a/Documentation/dev-tools/kunit/usage.rst b/Documentation/dev-tools/kunit/usage.rst
index c27e1646ecd9..8e35b94a17ec 100644
--- a/Documentation/dev-tools/kunit/usage.rst
+++ b/Documentation/dev-tools/kunit/usage.rst
@@ -671,8 +671,23 @@ Testing Static Functions
------------------------
If we do not want to expose functions or variables for testing, one option is to
-conditionally ``#include`` the test file at the end of your .c file. For
-example:
+conditionally export the used symbol. For example:
+
+.. code-block:: c
+
+ /* In my_file.c */
+
+ VISIBLE_IF_KUNIT int do_interesting_thing();
+ EXPORT_SYMBOL_IF_KUNIT(do_interesting_thing);
+
+ /* In my_file.h */
+
+ #if IS_ENABLED(CONFIG_KUNIT)
+ int do_interesting_thing(void);
+ #endif
+
+Alternatively, you could conditionally ``#include`` the test file at the end of
+your .c file. For example:
.. code-block:: c
---
base-commit: eeb8e8d9f124f279e80ae679f4ba6e822ce4f95f
change-id: 20240108-kunit-doc-export-eec1f910ab67
Best regards,
--
Arthur Grillo <arthurgrillo(a)riseup.net>