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[PATCH v2] selftests/bpf: Add powerpc support for get_preempt_count() in selftest

Saket Kumar Bhaskar posted 1 patch 1 month, 2 weeks ago 
tools/testing/selftests/bpf/bpf_experimental.h | 7 +++++++
1 file changed, 7 insertions(+)
[PATCH v2] selftests/bpf: Add powerpc support for get_preempt_count() in selftest
Posted by Saket Kumar Bhaskar 1 month, 2 weeks ago 
get_preempt_count() is enabled to return preempt_count for powerpc,
so that bpf_in_interrupt()/bpf_in_nmi()/bpf_in_serving_softirq()/
bpf_in_task()/bpf_in_hardirq()/get_preempt_count() works for
powerpc as well.

Signed-off-by: Saket Kumar Bhaskar <skb99@linux.ibm.com>
---
Changes since v1:
* Updated the comments to include powerpc for the APIs.

v1: https://lore.kernel.org/bpf/20260129054035.168078-1-skb99@linux.ibm.com/
---
 tools/testing/selftests/bpf/bpf_experimental.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tools/testing/selftests/bpf/bpf_experimental.h b/tools/testing/selftests/bpf/bpf_experimental.h
index 4b7210c318dd..9df77e59d4f5 100644
--- a/tools/testing/selftests/bpf/bpf_experimental.h
+++ b/tools/testing/selftests/bpf/bpf_experimental.h
@@ -645,6 +645,8 @@ static inline int get_preempt_count(void)
 			bpf_this_cpu_ptr(&pcpu_hot))->preempt_count;
 #elif defined(bpf_target_arm64)
 	return bpf_get_current_task_btf()->thread_info.preempt.count;
+#elif defined(bpf_target_powerpc)
+	return bpf_get_current_task_btf()->thread_info.preempt_count;
 #endif
 	return 0;
 }
@@ -653,6 +655,7 @@ static inline int get_preempt_count(void)
  *	Report whether it is in interrupt context. Only works on the following archs:
  *	* x86
  *	* arm64
+ *	* powerpc64
  */
 static inline int bpf_in_interrupt(void)
 {
@@ -672,6 +675,7 @@ static inline int bpf_in_interrupt(void)
  *	Report whether it is in NMI context. Only works on the following archs:
  *	* x86
  *	* arm64
+ *	* powerpc64
  */
 static inline int bpf_in_nmi(void)
 {
@@ -682,6 +686,7 @@ static inline int bpf_in_nmi(void)
  *	Report whether it is in hard IRQ context. Only works on the following archs:
  *	* x86
  *	* arm64
+ *	* powerpc64
  */
 static inline int bpf_in_hardirq(void)
 {
@@ -692,6 +697,7 @@ static inline int bpf_in_hardirq(void)
  *	Report whether it is in softirq context. Only works on the following archs:
  *	* x86
  *	* arm64
+ *	* powerpc64
  */
 static inline int bpf_in_serving_softirq(void)
 {
@@ -710,6 +716,7 @@ static inline int bpf_in_serving_softirq(void)
  *	Report whether it is in task context. Only works on the following archs:
  *	* x86
  *	* arm64
+ *	* powerpc64
  */
 static inline int bpf_in_task(void)
 {
-- 
2.52.0
Re: [PATCH v2] selftests/bpf: Add powerpc support for get_preempt_count() in selftest
Posted by Yonghong Song 1 month, 2 weeks ago 

On 2/12/26 1:25 AM, Saket Kumar Bhaskar wrote:
> get_preempt_count() is enabled to return preempt_count for powerpc,
> so that bpf_in_interrupt()/bpf_in_nmi()/bpf_in_serving_softirq()/
> bpf_in_task()/bpf_in_hardirq()/get_preempt_count() works for
> powerpc as well.
>
> Signed-off-by: Saket Kumar Bhaskar <skb99@linux.ibm.com>
> ---
> Changes since v1:
> * Updated the comments to include powerpc for the APIs.
>
> v1: https://lore.kernel.org/bpf/20260129054035.168078-1-skb99@linux.ibm.com/
> ---
>   tools/testing/selftests/bpf/bpf_experimental.h | 7 +++++++
>   1 file changed, 7 insertions(+)
>
> diff --git a/tools/testing/selftests/bpf/bpf_experimental.h b/tools/testing/selftests/bpf/bpf_experimental.h
> index 4b7210c318dd..9df77e59d4f5 100644
> --- a/tools/testing/selftests/bpf/bpf_experimental.h
> +++ b/tools/testing/selftests/bpf/bpf_experimental.h
> @@ -645,6 +645,8 @@ static inline int get_preempt_count(void)
>   			bpf_this_cpu_ptr(&pcpu_hot))->preempt_count;
>   #elif defined(bpf_target_arm64)
>   	return bpf_get_current_task_btf()->thread_info.preempt.count;
> +#elif defined(bpf_target_powerpc)
> +	return bpf_get_current_task_btf()->thread_info.preempt_count;
>   #endif

Maybe do
   #elif defined(bpf_target_arm64) || defined(bpf_target_powerpc)
?

>   	return 0;
>   }
> @@ -653,6 +655,7 @@ static inline int get_preempt_count(void)
>    *	Report whether it is in interrupt context. Only works on the following archs:
>    *	* x86
>    *	* arm64
> + *	* powerpc64
>    */
>   static inline int bpf_in_interrupt(void)
>   {
> @@ -672,6 +675,7 @@ static inline int bpf_in_interrupt(void)
>    *	Report whether it is in NMI context. Only works on the following archs:
>    *	* x86
>    *	* arm64
> + *	* powerpc64
>    */
>   static inline int bpf_in_nmi(void)
>   {
> @@ -682,6 +686,7 @@ static inline int bpf_in_nmi(void)
>    *	Report whether it is in hard IRQ context. Only works on the following archs:
>    *	* x86
>    *	* arm64
> + *	* powerpc64
>    */
>   static inline int bpf_in_hardirq(void)
>   {
> @@ -692,6 +697,7 @@ static inline int bpf_in_hardirq(void)
>    *	Report whether it is in softirq context. Only works on the following archs:
>    *	* x86
>    *	* arm64
> + *	* powerpc64
>    */
>   static inline int bpf_in_serving_softirq(void)
>   {
> @@ -710,6 +716,7 @@ static inline int bpf_in_serving_softirq(void)
>    *	Report whether it is in task context. Only works on the following archs:
>    *	* x86
>    *	* arm64
> + *	* powerpc64
>    */
>   static inline int bpf_in_task(void)
>   {
Re: [PATCH v2] selftests/bpf: Add powerpc support for get_preempt_count() in selftest
Posted by Yonghong Song 1 month, 2 weeks ago 
On 2/12/26 3:52 PM, Yonghong Song wrote:
>
>
> On 2/12/26 1:25 AM, Saket Kumar Bhaskar wrote:
>> get_preempt_count() is enabled to return preempt_count for powerpc,
>> so that bpf_in_interrupt()/bpf_in_nmi()/bpf_in_serving_softirq()/
>> bpf_in_task()/bpf_in_hardirq()/get_preempt_count() works for
>> powerpc as well.
>>
>> Signed-off-by: Saket Kumar Bhaskar <skb99@linux.ibm.com>
>> ---
>> Changes since v1:
>> * Updated the comments to include powerpc for the APIs.
>>
>> v1: 
>> https://lore.kernel.org/bpf/20260129054035.168078-1-skb99@linux.ibm.com/
>> ---
>>   tools/testing/selftests/bpf/bpf_experimental.h | 7 +++++++
>>   1 file changed, 7 insertions(+)
>>
>> diff --git a/tools/testing/selftests/bpf/bpf_experimental.h 
>> b/tools/testing/selftests/bpf/bpf_experimental.h
>> index 4b7210c318dd..9df77e59d4f5 100644
>> --- a/tools/testing/selftests/bpf/bpf_experimental.h
>> +++ b/tools/testing/selftests/bpf/bpf_experimental.h
>> @@ -645,6 +645,8 @@ static inline int get_preempt_count(void)
>> bpf_this_cpu_ptr(&pcpu_hot))->preempt_count;
>>   #elif defined(bpf_target_arm64)
>>       return bpf_get_current_task_btf()->thread_info.preempt.count;
>> +#elif defined(bpf_target_powerpc)
>> +    return bpf_get_current_task_btf()->thread_info.preempt_count;
>>   #endif
>
> Maybe do
>   #elif defined(bpf_target_arm64) || defined(bpf_target_powerpc)
> ?

Sorry, my bad. Please ignore as missing preempt.count vs. preempt_count.

>
>>       return 0;
>>   }
>> @@ -653,6 +655,7 @@ static inline int get_preempt_count(void)
>>    *    Report whether it is in interrupt context. Only works on the 
>> following archs:
>>    *    * x86
>>    *    * arm64
>> + *    * powerpc64
>>    */
>>   static inline int bpf_in_interrupt(void)
>>   {
>> @@ -672,6 +675,7 @@ static inline int bpf_in_interrupt(void)
>>    *    Report whether it is in NMI context. Only works on the 
>> following archs:
>>    *    * x86
>>    *    * arm64
>> + *    * powerpc64
>>    */
>>   static inline int bpf_in_nmi(void)
>>   {
>> @@ -682,6 +686,7 @@ static inline int bpf_in_nmi(void)
>>    *    Report whether it is in hard IRQ context. Only works on the 
>> following archs:
>>    *    * x86
>>    *    * arm64
>> + *    * powerpc64
>>    */
>>   static inline int bpf_in_hardirq(void)
>>   {
>> @@ -692,6 +697,7 @@ static inline int bpf_in_hardirq(void)
>>    *    Report whether it is in softirq context. Only works on the 
>> following archs:
>>    *    * x86
>>    *    * arm64
>> + *    * powerpc64
>>    */
>>   static inline int bpf_in_serving_softirq(void)
>>   {
>> @@ -710,6 +716,7 @@ static inline int bpf_in_serving_softirq(void)
>>    *    Report whether it is in task context. Only works on the 
>> following archs:
>>    *    * x86
>>    *    * arm64
>> + *    * powerpc64
>>    */
>>   static inline int bpf_in_task(void)
>>   {
>
>
Re: [PATCH v2] selftests/bpf: Add powerpc support for get_preempt_count() in selftest
Posted by Venkat Rao Bagalkote 1 month, 2 weeks ago 
On 12/02/26 2:55 pm, Saket Kumar Bhaskar wrote:
> get_preempt_count() is enabled to return preempt_count for powerpc,
> so that bpf_in_interrupt()/bpf_in_nmi()/bpf_in_serving_softirq()/
> bpf_in_task()/bpf_in_hardirq()/get_preempt_count() works for
> powerpc as well.
>
> Signed-off-by: Saket Kumar Bhaskar <skb99@linux.ibm.com>


Tested this patch by applying on mainline kernel, and below selftests 
passes.


Please add below tag.


Tested-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>



./test_progs -t exe_ctx
[  610.897388] bpf_testmod: loading out-of-tree module taints kernel.
[  610.907373] audit: type=1334 audit(1771408772.036:229): prog-id=72 
op=LOAD
[  610.907385] audit: type=1334 audit(1771408772.036:230): prog-id=72 
op=UNLOAD
[  610.907461] audit: type=1334 audit(1771408772.036:231): prog-id=73 
op=LOAD
[  610.907467] audit: type=1334 audit(1771408772.036:232): prog-id=73 
op=UNLOAD
[  610.941282] audit: type=1334 audit(1771408772.076:233): prog-id=74 
op=LOAD
[  610.941290] audit: type=1334 audit(1771408772.076:234): prog-id=74 
op=UNLOAD
[  610.956474] audit: type=1334 audit(1771408772.086:235): prog-id=75 
op=LOAD
[  610.956481] audit: type=1334 audit(1771408772.086:236): prog-id=75 
op=UNLOAD
[  610.956964] audit: type=1334 audit(1771408772.086:237): prog-id=76 
op=LOAD
[  610.956970] audit: type=1334 audit(1771408772.086:238): prog-id=76 
op=UNLOAD
#109     exe_ctx:OK
Summary: 1/0 PASSED, 0 SKIPPED, 0 FAILED


./test_progs -t timer_interrupt
[  730.106678] kauditd_printk_skb: 6 callbacks suppressed
[  730.106685] audit: type=1334 audit(1771408891.236:245): prog-id=80 
op=LOAD
[  730.106700] audit: type=1334 audit(1771408891.236:246): prog-id=80 
op=UNLOAD
[  730.106787] audit: type=1334 audit(1771408891.236:247): prog-id=81 
op=LOAD
[  730.106794] audit: type=1334 audit(1771408891.236:248): prog-id=81 
op=UNLOAD
[  730.136150] audit: type=1334 audit(1771408891.266:249): prog-id=82 
op=LOAD
[  730.136158] audit: type=1334 audit(1771408891.266:250): prog-id=82 
op=UNLOAD
[  730.151245] audit: type=1334 audit(1771408891.286:251): prog-id=83 
op=LOAD
[  730.151252] audit: type=1334 audit(1771408891.286:252): prog-id=83 
op=UNLOAD
[  730.151572] audit: type=1334 audit(1771408891.286:253): prog-id=84 
op=LOAD
[  730.151578] audit: type=1334 audit(1771408891.286:254): prog-id=84 
op=UNLOAD
#490     timer_interrupt:OK
Summary: 1/0 PASSED, 0 SKIPPED, 0 FAILED


Regards,

Venkat.

> ---
> Changes since v1:
> * Updated the comments to include powerpc for the APIs.
>
> v1: https://lore.kernel.org/bpf/20260129054035.168078-1-skb99@linux.ibm.com/
> ---
>   tools/testing/selftests/bpf/bpf_experimental.h | 7 +++++++
>   1 file changed, 7 insertions(+)
>
> diff --git a/tools/testing/selftests/bpf/bpf_experimental.h b/tools/testing/selftests/bpf/bpf_experimental.h
> index 4b7210c318dd..9df77e59d4f5 100644
> --- a/tools/testing/selftests/bpf/bpf_experimental.h
> +++ b/tools/testing/selftests/bpf/bpf_experimental.h
> @@ -645,6 +645,8 @@ static inline int get_preempt_count(void)
>   			bpf_this_cpu_ptr(&pcpu_hot))->preempt_count;
>   #elif defined(bpf_target_arm64)
>   	return bpf_get_current_task_btf()->thread_info.preempt.count;
> +#elif defined(bpf_target_powerpc)
> +	return bpf_get_current_task_btf()->thread_info.preempt_count;
>   #endif
>   	return 0;
>   }
> @@ -653,6 +655,7 @@ static inline int get_preempt_count(void)
>    *	Report whether it is in interrupt context. Only works on the following archs:
>    *	* x86
>    *	* arm64
> + *	* powerpc64
>    */
>   static inline int bpf_in_interrupt(void)
>   {
> @@ -672,6 +675,7 @@ static inline int bpf_in_interrupt(void)
>    *	Report whether it is in NMI context. Only works on the following archs:
>    *	* x86
>    *	* arm64
> + *	* powerpc64
>    */
>   static inline int bpf_in_nmi(void)
>   {
> @@ -682,6 +686,7 @@ static inline int bpf_in_nmi(void)
>    *	Report whether it is in hard IRQ context. Only works on the following archs:
>    *	* x86
>    *	* arm64
> + *	* powerpc64
>    */
>   static inline int bpf_in_hardirq(void)
>   {
> @@ -692,6 +697,7 @@ static inline int bpf_in_hardirq(void)
>    *	Report whether it is in softirq context. Only works on the following archs:
>    *	* x86
>    *	* arm64
> + *	* powerpc64
>    */
>   static inline int bpf_in_serving_softirq(void)
>   {
> @@ -710,6 +716,7 @@ static inline int bpf_in_serving_softirq(void)
>    *	Report whether it is in task context. Only works on the following archs:
>    *	* x86
>    *	* arm64
> + *	* powerpc64
>    */
>   static inline int bpf_in_task(void)
>   {

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