* [PATCH bpf-next v2 0/4] selftests/bpf: Add some tests for LoongArch
@ 2026-06-15 10:05 Tiezhu Yang
2026-06-15 10:05 ` [PATCH bpf-next v2 1/4] selftests/bpf: Add get_preempt_count() support " Tiezhu Yang
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: Tiezhu Yang @ 2026-06-15 10:05 UTC (permalink / raw)
To: Alexei Starovoitov, Huacai Chen; +Cc: loongarch, bpf
This series is based on the latest master branch of bpf-next tree.
https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git/
Dependency Note:
================
This series strictly depends on the following LoongArch core series,
which moves thread_info into task_struct:
"Move thread_info into task_struct for LoongArch"
https://lore.kernel.org/loongarch/20260612011616.27771-1-yangtiezhu@loongson.cn/
Because of this cross-tree dependency, these patches are based on the
bpf-next tree for review, but the actual merge timing and routing are
left to the discretion of the BPF and LoongArch maintainers.
Tiezhu Yang (4):
selftests/bpf: Add get_preempt_count() support for LoongArch
selftests/bpf: Add __arch_loongarch to limit test cases for LoongArch
selftests/bpf: Test jited inline of bpf_get_current_task() for
LoongArch
selftests/bpf: Test jited inline of bpf_get_smp_processor_id() for
LoongArch
.../testing/selftests/bpf/bpf_experimental.h | 23 +++++++++++++++++++
tools/testing/selftests/bpf/progs/bpf_misc.h | 1 +
.../selftests/bpf/progs/verifier_jit_inline.c | 13 +++++++++++
tools/testing/selftests/bpf/test_loader.c | 5 ++++
4 files changed, 42 insertions(+)
--
2.42.0
^ permalink raw reply [flat|nested] 6+ messages in thread
* [PATCH bpf-next v2 1/4] selftests/bpf: Add get_preempt_count() support for LoongArch
2026-06-15 10:05 [PATCH bpf-next v2 0/4] selftests/bpf: Add some tests for LoongArch Tiezhu Yang
@ 2026-06-15 10:05 ` Tiezhu Yang
2026-06-15 10:05 ` [PATCH bpf-next v2 2/4] selftests/bpf: Add __arch_loongarch to limit test cases " Tiezhu Yang
` (3 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: Tiezhu Yang @ 2026-06-15 10:05 UTC (permalink / raw)
To: Alexei Starovoitov, Huacai Chen; +Cc: loongarch, bpf
There is no LoongArch support for get_preempt_count() currently and its
fallback path always returns 0, just add it so that bpf_in_interrupt(),
bpf_in_nmi(), bpf_in_hardirq(), bpf_in_serving_softirq(), bpf_in_task()
work for LoongArch as well.
Use bpf_core_field_exists() to provide compatibility for both legacy and
future kernels. Additionally, a struct flavor "task_struct___local" is
introduced to bypass static compiler checks when thread_info is missing
from the base task_struct.
For the newer kernels that select CONFIG_THREAD_INFO_IN_TASK, it reads
preempt_count from the thread_info embedded within task_struct. For the
older kernels without selecting CONFIG_THREAD_INFO_IN_TASK, it retrieves
the thread_info pointer from the bottom of the kernel stack (task->stack)
and then reads the preempt_count. This ensures the BPF selftests remain
functional across various LoongArch kernel versions.
With this patch, "./test_progs -t exe_ctx" passes on LoongArch regardless
of whether CONFIG_THREAD_INFO_IN_TASK is set.
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
---
.../testing/selftests/bpf/bpf_experimental.h | 23 +++++++++++++++++++
1 file changed, 23 insertions(+)
diff --git a/tools/testing/selftests/bpf/bpf_experimental.h b/tools/testing/selftests/bpf/bpf_experimental.h
index d1db355e872b..1d0b29a9acb8 100644
--- a/tools/testing/selftests/bpf/bpf_experimental.h
+++ b/tools/testing/selftests/bpf/bpf_experimental.h
@@ -401,6 +401,12 @@ struct task_struct___preempt_rt {
extern struct lowcore *bpf_get_lowcore(void) __weak __ksym;
#endif
+#ifdef bpf_target_loongarch
+struct task_struct___local {
+ struct thread_info thread_info;
+} __attribute__((preserve_access_index));
+#endif
+
static inline int get_preempt_count(void)
{
#if defined(bpf_target_x86)
@@ -423,6 +429,18 @@ static inline int get_preempt_count(void)
return bpf_get_current_task_btf()->thread_info.preempt_count;
#elif defined(bpf_target_s390)
return bpf_get_lowcore()->preempt_count;
+#elif defined(bpf_target_loongarch)
+ struct task_struct *task = bpf_get_current_task_btf();
+ struct task_struct___local *task_alt = (void *)task;
+
+ if (bpf_core_field_exists(task_alt->thread_info)) {
+ return BPF_CORE_READ(task_alt, thread_info.preempt_count);
+ } else {
+ void *stack = BPF_CORE_READ(task, stack);
+ struct thread_info *ti = (void *)stack;
+
+ return BPF_CORE_READ(ti, preempt_count);
+ }
#endif
return 0;
}
@@ -433,6 +451,7 @@ static inline int get_preempt_count(void)
* * arm64
* * powerpc64
* * s390x
+ * * loongarch
*/
static inline int bpf_in_interrupt(void)
{
@@ -454,6 +473,7 @@ static inline int bpf_in_interrupt(void)
* * arm64
* * powerpc64
* * s390x
+ * * loongarch
*/
static inline int bpf_in_nmi(void)
{
@@ -466,6 +486,7 @@ static inline int bpf_in_nmi(void)
* * arm64
* * powerpc64
* * s390x
+ * * loongarch
*/
static inline int bpf_in_hardirq(void)
{
@@ -478,6 +499,7 @@ static inline int bpf_in_hardirq(void)
* * arm64
* * powerpc64
* * s390x
+ * * loongarch
*/
static inline int bpf_in_serving_softirq(void)
{
@@ -498,6 +520,7 @@ static inline int bpf_in_serving_softirq(void)
* * arm64
* * powerpc64
* * s390x
+ * * loongarch
*/
static inline int bpf_in_task(void)
{
--
2.42.0
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH bpf-next v2 2/4] selftests/bpf: Add __arch_loongarch to limit test cases for LoongArch
2026-06-15 10:05 [PATCH bpf-next v2 0/4] selftests/bpf: Add some tests for LoongArch Tiezhu Yang
2026-06-15 10:05 ` [PATCH bpf-next v2 1/4] selftests/bpf: Add get_preempt_count() support " Tiezhu Yang
@ 2026-06-15 10:05 ` Tiezhu Yang
2026-06-15 10:05 ` [PATCH bpf-next v2 3/4] selftests/bpf: Test jited inline of bpf_get_current_task() " Tiezhu Yang
` (2 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: Tiezhu Yang @ 2026-06-15 10:05 UTC (permalink / raw)
To: Alexei Starovoitov, Huacai Chen; +Cc: loongarch, bpf
Make it possible to limit certain tests to loongarch, just like it is
already done for x86_64, arm64, riscv64, and s390x.
This is a follow up patch of:
commit ee7fe84468b1 ("selftests/bpf: __arch_* macro to limit test cases to specific archs")
commit 1e4e6b9e260d ("selftests/bpf: Add __arch_s390x macro")
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
---
tools/testing/selftests/bpf/progs/bpf_misc.h | 1 +
tools/testing/selftests/bpf/test_loader.c | 5 +++++
2 files changed, 6 insertions(+)
diff --git a/tools/testing/selftests/bpf/progs/bpf_misc.h b/tools/testing/selftests/bpf/progs/bpf_misc.h
index 9eeb5b0b63d6..b0c441384f20 100644
--- a/tools/testing/selftests/bpf/progs/bpf_misc.h
+++ b/tools/testing/selftests/bpf/progs/bpf_misc.h
@@ -158,6 +158,7 @@
#define __arch_arm64 __arch("ARM64")
#define __arch_riscv64 __arch("RISCV64")
#define __arch_s390x __arch("s390x")
+#define __arch_loongarch __arch("LOONGARCH")
#define __caps_unpriv(caps) __test_tag("test_caps_unpriv=" EXPAND_QUOTE(caps))
#define __load_if_JITed() __test_tag("load_mode=jited")
#define __load_if_no_JITed() __test_tag("load_mode=no_jited")
diff --git a/tools/testing/selftests/bpf/test_loader.c b/tools/testing/selftests/bpf/test_loader.c
index abdb9e6e3713..3ce32d134e2c 100644
--- a/tools/testing/selftests/bpf/test_loader.c
+++ b/tools/testing/selftests/bpf/test_loader.c
@@ -377,6 +377,7 @@ enum arch {
ARCH_ARM64 = 0x4,
ARCH_RISCV64 = 0x8,
ARCH_S390X = 0x10,
+ ARCH_LOONGARCH = 0x20,
};
static int get_current_arch(void)
@@ -389,6 +390,8 @@ static int get_current_arch(void)
return ARCH_RISCV64;
#elif defined(__s390x__)
return ARCH_S390X;
+#elif defined(__loongarch__)
+ return ARCH_LOONGARCH;
#endif
return ARCH_UNKNOWN;
}
@@ -580,6 +583,8 @@ static int parse_test_spec(struct test_loader *tester,
arch = ARCH_RISCV64;
} else if (strcmp(val, "s390x") == 0) {
arch = ARCH_S390X;
+ } else if (strcmp(val, "LOONGARCH") == 0) {
+ arch = ARCH_LOONGARCH;
} else {
PRINT_FAIL("bad arch spec: '%s'\n", val);
err = -EINVAL;
--
2.42.0
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH bpf-next v2 3/4] selftests/bpf: Test jited inline of bpf_get_current_task() for LoongArch
2026-06-15 10:05 [PATCH bpf-next v2 0/4] selftests/bpf: Add some tests for LoongArch Tiezhu Yang
2026-06-15 10:05 ` [PATCH bpf-next v2 1/4] selftests/bpf: Add get_preempt_count() support " Tiezhu Yang
2026-06-15 10:05 ` [PATCH bpf-next v2 2/4] selftests/bpf: Add __arch_loongarch to limit test cases " Tiezhu Yang
@ 2026-06-15 10:05 ` Tiezhu Yang
2026-06-15 10:05 ` [PATCH bpf-next v2 4/4] selftests/bpf: Test jited inline of bpf_get_smp_processor_id() " Tiezhu Yang
2026-06-15 15:45 ` [PATCH bpf-next v2 0/4] selftests/bpf: Add some tests " Alexei Starovoitov
4 siblings, 0 replies; 6+ messages in thread
From: Tiezhu Yang @ 2026-06-15 10:05 UTC (permalink / raw)
To: Alexei Starovoitov, Huacai Chen; +Cc: loongarch, bpf
Add the JITed inline instruction of bpf_get_current_task() for LoongArch
to pass the test case.
Before:
$ sudo ./test_progs -t verifier_jit_inline
#604/1 verifier_jit_inline/inline_bpf_get_current_task:SKIP
#604 verifier_jit_inline:SKIP
Summary: 1/0 PASSED, 1 SKIPPED, 0 FAILED
After:
$ sudo ./test_progs -t verifier_jit_inline
#604/1 verifier_jit_inline/inline_bpf_get_current_task:OK
#604 verifier_jit_inline:OK
Summary: 1/1 PASSED, 0 SKIPPED, 0 FAILED
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
---
tools/testing/selftests/bpf/progs/verifier_jit_inline.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/tools/testing/selftests/bpf/progs/verifier_jit_inline.c b/tools/testing/selftests/bpf/progs/verifier_jit_inline.c
index 76d80605ec7f..8560577f2557 100644
--- a/tools/testing/selftests/bpf/progs/verifier_jit_inline.c
+++ b/tools/testing/selftests/bpf/progs/verifier_jit_inline.c
@@ -12,6 +12,8 @@ __arch_arm64
__jited(" mrs x8, SP_EL0")
__arch_riscv64
__jited(" mv a5, tp")
+__arch_loongarch
+__jited(" move $a5, $tp")
int inline_bpf_get_current_task(void)
{
bpf_get_current_task();
--
2.42.0
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH bpf-next v2 4/4] selftests/bpf: Test jited inline of bpf_get_smp_processor_id() for LoongArch
2026-06-15 10:05 [PATCH bpf-next v2 0/4] selftests/bpf: Add some tests for LoongArch Tiezhu Yang
` (2 preceding siblings ...)
2026-06-15 10:05 ` [PATCH bpf-next v2 3/4] selftests/bpf: Test jited inline of bpf_get_current_task() " Tiezhu Yang
@ 2026-06-15 10:05 ` Tiezhu Yang
2026-06-15 15:45 ` [PATCH bpf-next v2 0/4] selftests/bpf: Add some tests " Alexei Starovoitov
4 siblings, 0 replies; 6+ messages in thread
From: Tiezhu Yang @ 2026-06-15 10:05 UTC (permalink / raw)
To: Alexei Starovoitov, Huacai Chen; +Cc: loongarch, bpf
Add the testcase for the jited inline of bpf_get_smp_processor_id(),
only for LoongArch currently.
Here is the test result on LoongArch:
$ sudo ./test_progs -t verifier_jit_inline
#604/1 verifier_jit_inline/inline_bpf_get_current_task:OK
#604/2 verifier_jit_inline/inline_bpf_get_smp_processor_id:OK
#604 verifier_jit_inline:OK
Summary: 1/2 PASSED, 0 SKIPPED, 0 FAILED
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
---
.../testing/selftests/bpf/progs/verifier_jit_inline.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/tools/testing/selftests/bpf/progs/verifier_jit_inline.c b/tools/testing/selftests/bpf/progs/verifier_jit_inline.c
index 8560577f2557..02e562f56f9d 100644
--- a/tools/testing/selftests/bpf/progs/verifier_jit_inline.c
+++ b/tools/testing/selftests/bpf/progs/verifier_jit_inline.c
@@ -21,4 +21,15 @@ int inline_bpf_get_current_task(void)
return 0;
}
+SEC("fentry/bpf_fentry_test2")
+__success __retval(0)
+__arch_loongarch
+__jited(" ld.wu $a5, $tp, 16")
+int inline_bpf_get_smp_processor_id(void)
+{
+ bpf_get_smp_processor_id();
+
+ return 0;
+}
+
char _license[] SEC("license") = "GPL";
--
2.42.0
^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [PATCH bpf-next v2 0/4] selftests/bpf: Add some tests for LoongArch
2026-06-15 10:05 [PATCH bpf-next v2 0/4] selftests/bpf: Add some tests for LoongArch Tiezhu Yang
` (3 preceding siblings ...)
2026-06-15 10:05 ` [PATCH bpf-next v2 4/4] selftests/bpf: Test jited inline of bpf_get_smp_processor_id() " Tiezhu Yang
@ 2026-06-15 15:45 ` Alexei Starovoitov
4 siblings, 0 replies; 6+ messages in thread
From: Alexei Starovoitov @ 2026-06-15 15:45 UTC (permalink / raw)
To: Tiezhu Yang, Alexei Starovoitov, Huacai Chen; +Cc: loongarch, bpf
On Mon Jun 15, 2026 at 3:05 AM PDT, Tiezhu Yang wrote:
> This series is based on the latest master branch of bpf-next tree.
> https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git/
>
> Dependency Note:
> ================
> This series strictly depends on the following LoongArch core series,
> which moves thread_info into task_struct:
>
> "Move thread_info into task_struct for LoongArch"
> https://lore.kernel.org/loongarch/20260612011616.27771-1-yangtiezhu@loongson.cn/
Pls repost when this patch appears in bpf-next.
pw-bot: cr
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2026-06-15 15:45 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2026-06-15 10:05 [PATCH bpf-next v2 0/4] selftests/bpf: Add some tests for LoongArch Tiezhu Yang
2026-06-15 10:05 ` [PATCH bpf-next v2 1/4] selftests/bpf: Add get_preempt_count() support " Tiezhu Yang
2026-06-15 10:05 ` [PATCH bpf-next v2 2/4] selftests/bpf: Add __arch_loongarch to limit test cases " Tiezhu Yang
2026-06-15 10:05 ` [PATCH bpf-next v2 3/4] selftests/bpf: Test jited inline of bpf_get_current_task() " Tiezhu Yang
2026-06-15 10:05 ` [PATCH bpf-next v2 4/4] selftests/bpf: Test jited inline of bpf_get_smp_processor_id() " Tiezhu Yang
2026-06-15 15:45 ` [PATCH bpf-next v2 0/4] selftests/bpf: Add some tests " Alexei Starovoitov
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox