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bpf: Inline helper in powerpc JIT #6372

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bpf: Inline helper in powerpc JIT #6372

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50b3a91
powerpc64/bpf: Support internal-only MOV instruction to resolve per-C…
Nov 17, 2025
bb62a24
powerpc64/bpf: Inline bpf_get_smp_processor_id() and bpf_get_current_…
Nov 17, 2025
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16 changes: 16 additions & 0 deletions arch/powerpc/net/bpf_jit_comp.c
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Original file line number Diff line number Diff line change
Expand Up @@ -466,6 +466,22 @@ bool bpf_jit_supports_insn(struct bpf_insn *insn, bool in_arena)
return true;
}

bool bpf_jit_supports_percpu_insn(void)
{
return IS_ENABLED(CONFIG_PPC64);
}

bool bpf_jit_inlines_helper_call(s32 imm)
{
switch (imm) {
case BPF_FUNC_get_smp_processor_id:
case BPF_FUNC_get_current_task:
return true;
default:
return false;
}
}

void *arch_alloc_bpf_trampoline(unsigned int size)
{
return bpf_prog_pack_alloc(size, bpf_jit_fill_ill_insns);
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19 changes: 19 additions & 0 deletions arch/powerpc/net/bpf_jit_comp64.c
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Original file line number Diff line number Diff line change
Expand Up @@ -918,6 +918,15 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, u32 *fimage, struct code
case BPF_ALU | BPF_MOV | BPF_X: /* (u32) dst = src */
case BPF_ALU64 | BPF_MOV | BPF_X: /* dst = src */

if (insn_is_mov_percpu_addr(&insn[i])) {
if (IS_ENABLED(CONFIG_SMP)) {
EMIT(PPC_RAW_LD(tmp1_reg, _R13, offsetof(struct paca_struct, data_offset)));
EMIT(PPC_RAW_ADD(dst_reg, src_reg, tmp1_reg));
} else {
EMIT(PPC_RAW_MR(dst_reg, src_reg));
}
}

if (insn_is_cast_user(&insn[i])) {
EMIT(PPC_RAW_RLDICL_DOT(tmp1_reg, src_reg, 0, 32));
PPC_LI64(dst_reg, (ctx->user_vm_start & 0xffffffff00000000UL));
Expand Down Expand Up @@ -1390,6 +1399,16 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, u32 *fimage, struct code
case BPF_JMP | BPF_CALL:
ctx->seen |= SEEN_FUNC;

if (insn[i].src_reg == BPF_REG_0) {
if (imm == BPF_FUNC_get_smp_processor_id) {
EMIT(PPC_RAW_LHZ(insn[i].src_reg, _R13, offsetof(struct paca_struct, paca_index)));
break;
} else if (imm == BPF_FUNC_get_current_task) {
EMIT(PPC_RAW_LD(insn[i].src_reg, _R13, offsetof(struct paca_struct, __current)));
break;
}
}

ret = bpf_jit_get_func_addr(fp, &insn[i], extra_pass,
&func_addr, &func_addr_fixed);
if (ret < 0)
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