From: Chen Hui judy.chenhui@huawei.com
hulk inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I7X7WW
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Add cpumask ops collection, such as cpumask_empty, cpumask_and, cpumask_andnot, cpumask_subset, cpumask_equal, cpumask_copy.
Signed-off-by: Chen Hui judy.chenhui@huawei.com Signed-off-by: Hui Tang tanghui20@huawei.com Signed-off-by: Guan Jing guanjing6@huawei.com --- include/linux/sched.h | 23 +++++++++ include/uapi/linux/bpf.h | 43 +++++++++++++++++ kernel/sched/bpf_sched.c | 87 ++++++++++++++++++++++++++++++++++ scripts/bpf_doc.py | 4 ++ tools/include/uapi/linux/bpf.h | 43 +++++++++++++++++ 5 files changed, 200 insertions(+)
diff --git a/include/linux/sched.h b/include/linux/sched.h index bf145f437adc..492f2955a602 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -2507,6 +2507,29 @@ struct bpf_sched_cpu_stats { unsigned long capacity_orig; };
+struct cpumask_op_args { + unsigned int op_type; + void *arg1; + void *arg2; + void *arg3; + void *arg4; +}; + +enum cpumask_op_type { + CPUMASK_EMPTY, + CPUMASK_AND, + CPUMASK_ANDNOT, + CPUMASK_SUBSET, + CPUMASK_EQUAL, + CPUMASK_TEST_CPU, + CPUMASK_COPY, + CPUMASK_WEIGHT, + CPUMASK_NEXT, + CPUMASK_NEXT_WRAP, + CPUMASK_NEXT_AND, + CPUMASK_CPULIST_PARSE +}; + #endif
#endif diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index b224509c795b..afd786314ba9 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -5637,6 +5637,48 @@ union bpf_attr { * Return task group of *se* if se is a task group. * Return * Task struct if se is a task group, NULL otherwise. + * + * int bpf_cpumask_op(struct cpumask_op_args *op, int len) + * Description + * A series of cpumask-related operations. Perform different + * operations base on *op*->type. User also need fill other + * *op* field base on *op*->type. *op*->type is one of them + * + * **CPUMASK_EMPTY** + * *(op->arg1) == 0 returned. + * **CPUMASK_AND** + * *(op->arg1) = *(op->arg2) & *(op->arg3) + * **CPUMASK_ANDNOT** + * *(op->arg1) = *(op->arg2) & ~*(op->arg3) + * **CPUMASK_SUBSET** + * *(op->arg1) & ~*(op->arg2) == 0 returned + * **CPUMASK_EQUAL** + * *(op->arg1) == *(op->arg2) returned + * **CPUMASK_TEST_CPU** + * test for a cpu *(int)(op->arg1) in *(op->arg2) + * returns 1 if *op*->arg1 is set in *op*->arg2, else returns 0 + * **CPUMASK_COPY** + * *(op->arg1) = *(op->arg2), return 0 always + * **CPUMASK_WEIGHT** + * count of bits in *(op->arg1) + * **CPUMASK_NEXT** + * get the next cpu in *(struct cpumask *)(op->arg2) + * *(int *)(op->arg1): the cpu prior to the place to search + * **CPUMASK_NEXT_WRAP** + * helper to implement for_each_cpu_wrap + * @op->arg1: the cpu prior to the place to search + * @op->arg2: the cpumask pointer + * @op->arg3: the start point of the iteration + * @op->arg4: assume @op->arg1 crossing @op->arg3 terminates the iteration + * returns >= nr_cpu_ids on completion + * **CPUMASK_NEXT_AND** + * get the next cpu in *(op->arg1) & *(op->arg2) + * **CPUMASK_CPULIST_PARSE** + * extract a cpumask from a user string of ranges. + * (char *)op->arg1 -> (struct cpumask *)(op->arg2) + * 0 on success, or a negative error in case of failure. + * Return + * View above. */ #define ___BPF_FUNC_MAPPER(FN, ctx...) \ FN(unspec, 0, ##ctx) \ @@ -5863,6 +5905,7 @@ union bpf_attr { FN(sched_entity_is_task, 221, ##ctx) \ FN(sched_entity_to_task, 222, ##ctx) \ FN(sched_entity_to_tg, 223, ##ctx) \ + FN(cpumask_op, 224, ##ctx) \ /* */
/* backwards-compatibility macros for users of __BPF_FUNC_MAPPER that don't diff --git a/kernel/sched/bpf_sched.c b/kernel/sched/bpf_sched.c index f0ec3462ff17..047c8d48405e 100644 --- a/kernel/sched/bpf_sched.c +++ b/kernel/sched/bpf_sched.c @@ -178,6 +178,91 @@ static const struct bpf_func_proto bpf_sched_entity_to_tg_proto = { .arg1_btf_id = &btf_sched_entity_ids[0], };
+BPF_CALL_2(bpf_cpumask_op, struct cpumask_op_args *, op, int, len) +{ + int ret; + + if (len != sizeof(*op) || !op->arg1) + return -EINVAL; + + switch (op->op_type) { + case CPUMASK_EMPTY: + return cpumask_empty((const struct cpumask *)op->arg1); + case CPUMASK_AND: + if (!op->arg2 || !op->arg3) + return -EINVAL; + return cpumask_and((struct cpumask *)op->arg1, + (const struct cpumask *)op->arg2, + (const struct cpumask *)op->arg3); + case CPUMASK_ANDNOT: + if (!op->arg2 || !op->arg3) + return -EINVAL; + cpumask_andnot((struct cpumask *)op->arg1, + (const struct cpumask *)op->arg2, + (const struct cpumask *)op->arg3); + break; + case CPUMASK_SUBSET: + if (!op->arg2) + return -EINVAL; + return cpumask_subset((const struct cpumask *)op->arg1, + (const struct cpumask *)op->arg2); + case CPUMASK_EQUAL: + if (!op->arg2) + return -EINVAL; + return cpumask_equal((const struct cpumask *)op->arg1, + (const struct cpumask *)op->arg2); + case CPUMASK_TEST_CPU: + if (!op->arg2) + return -EINVAL; + return cpumask_test_cpu(*(int *)op->arg1, op->arg2); + case CPUMASK_COPY: + if (!op->arg2) + return -EINVAL; + cpumask_copy((struct cpumask *)op->arg1, + (const struct cpumask *)op->arg2); + break; + case CPUMASK_WEIGHT: + return cpumask_weight((const struct cpumask *)op->arg1); + case CPUMASK_NEXT: + if (!op->arg2) + return -EINVAL; + return cpumask_next(*(int *)op->arg1, + (const struct cpumask *)op->arg2); + case CPUMASK_NEXT_WRAP: + if (!op->arg2 || !op->arg3 || !op->arg4) + return -EINVAL; + return cpumask_next_wrap(*(int *)op->arg1, + (const struct cpumask *)op->arg2, + *(int *)op->arg3, *(int *)op->arg4); + case CPUMASK_NEXT_AND: + if (!op->arg2 || !op->arg3) + return -EINVAL; + return cpumask_next_and(*(int *)op->arg1, + (const struct cpumask *)op->arg2, + (const struct cpumask *)op->arg3); + case CPUMASK_CPULIST_PARSE: + if (!op->arg2) + return -EINVAL; + + op->arg1 = (void *)strstrip((void *)op->arg1); + ret = cpulist_parse((void *)op->arg1, + (struct cpumask *)op->arg2); + return ret; + default: + return -EINVAL; + } + + return 0; +} + +static const struct bpf_func_proto bpf_cpumask_op_proto = { + .func = bpf_cpumask_op, + .gpl_only = false, + .ret_type = RET_INTEGER, + .arg1_type = ARG_PTR_TO_MEM, + .arg2_type = ARG_CONST_SIZE, +}; + static const struct bpf_func_proto * bpf_sched_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) { @@ -196,6 +281,8 @@ bpf_sched_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) return &bpf_sched_entity_to_task_proto; case BPF_FUNC_sched_entity_to_tg: return &bpf_sched_entity_to_tg_proto; + case BPF_FUNC_cpumask_op: + return &bpf_cpumask_op_proto; default: return bpf_base_func_proto(func_id); } diff --git a/scripts/bpf_doc.py b/scripts/bpf_doc.py index 11cf353ad57f..7f5952a3be61 100755 --- a/scripts/bpf_doc.py +++ b/scripts/bpf_doc.py @@ -705,6 +705,8 @@ class PrinterHelpers(Printer): 'struct bpf_cpu_topology', 'struct bpf_cpumask_info', 'struct sched_entity', + 'struct cpumask', + 'struct cpumask_op_args', ] known_types = { '...', @@ -765,6 +767,8 @@ class PrinterHelpers(Printer): 'struct bpf_cpu_topology', 'struct bpf_cpumask_info', 'struct sched_entity', + 'struct cpumask', + 'struct cpumask_op_args', } mapped_types = { 'u8': '__u8', diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h index b224509c795b..afd786314ba9 100644 --- a/tools/include/uapi/linux/bpf.h +++ b/tools/include/uapi/linux/bpf.h @@ -5637,6 +5637,48 @@ union bpf_attr { * Return task group of *se* if se is a task group. * Return * Task struct if se is a task group, NULL otherwise. + * + * int bpf_cpumask_op(struct cpumask_op_args *op, int len) + * Description + * A series of cpumask-related operations. Perform different + * operations base on *op*->type. User also need fill other + * *op* field base on *op*->type. *op*->type is one of them + * + * **CPUMASK_EMPTY** + * *(op->arg1) == 0 returned. + * **CPUMASK_AND** + * *(op->arg1) = *(op->arg2) & *(op->arg3) + * **CPUMASK_ANDNOT** + * *(op->arg1) = *(op->arg2) & ~*(op->arg3) + * **CPUMASK_SUBSET** + * *(op->arg1) & ~*(op->arg2) == 0 returned + * **CPUMASK_EQUAL** + * *(op->arg1) == *(op->arg2) returned + * **CPUMASK_TEST_CPU** + * test for a cpu *(int)(op->arg1) in *(op->arg2) + * returns 1 if *op*->arg1 is set in *op*->arg2, else returns 0 + * **CPUMASK_COPY** + * *(op->arg1) = *(op->arg2), return 0 always + * **CPUMASK_WEIGHT** + * count of bits in *(op->arg1) + * **CPUMASK_NEXT** + * get the next cpu in *(struct cpumask *)(op->arg2) + * *(int *)(op->arg1): the cpu prior to the place to search + * **CPUMASK_NEXT_WRAP** + * helper to implement for_each_cpu_wrap + * @op->arg1: the cpu prior to the place to search + * @op->arg2: the cpumask pointer + * @op->arg3: the start point of the iteration + * @op->arg4: assume @op->arg1 crossing @op->arg3 terminates the iteration + * returns >= nr_cpu_ids on completion + * **CPUMASK_NEXT_AND** + * get the next cpu in *(op->arg1) & *(op->arg2) + * **CPUMASK_CPULIST_PARSE** + * extract a cpumask from a user string of ranges. + * (char *)op->arg1 -> (struct cpumask *)(op->arg2) + * 0 on success, or a negative error in case of failure. + * Return + * View above. */ #define ___BPF_FUNC_MAPPER(FN, ctx...) \ FN(unspec, 0, ##ctx) \ @@ -5863,6 +5905,7 @@ union bpf_attr { FN(sched_entity_is_task, 221, ##ctx) \ FN(sched_entity_to_task, 222, ##ctx) \ FN(sched_entity_to_tg, 223, ##ctx) \ + FN(cpumask_op, 224, ##ctx) \ /* */
/* backwards-compatibility macros for users of __BPF_FUNC_MAPPER that don't