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powerpc/bpf/64: add support for atomic fetch operations

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Adding instructions for ppc64 for

atomic[64]_fetch_add
atomic[64]_fetch_and
atomic[64]_fetch_or
atomic[64]_fetch_xor

Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
Tested-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> (ppc64le)
Reviewed-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220610155552.25892-3-hbathini@linux.ibm.com
This commit is contained in:
Hari Bathini 2022-06-10 21:25:49 +05:30 committed by Michael Ellerman
parent 6511270911
commit dbe6e2456f
1 changed files with 13 additions and 1 deletions
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14
arch/powerpc/net/bpf_jit_comp64.c
View file

@ -787,17 +787,25 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, struct codegen_context *
else
EMIT(PPC_RAW_LWARX(tmp2_reg, tmp1_reg, dst_reg, 0));
/* Save old value in _R0 */
if (imm & BPF_FETCH)
EMIT(PPC_RAW_MR(_R0, tmp2_reg));
switch (imm) {
case BPF_ADD:
case BPF_ADD | BPF_FETCH:
EMIT(PPC_RAW_ADD(tmp2_reg, tmp2_reg, src_reg));
break;
case BPF_AND:
case BPF_AND | BPF_FETCH:
EMIT(PPC_RAW_AND(tmp2_reg, tmp2_reg, src_reg));
break;
case BPF_OR:
case BPF_OR | BPF_FETCH:
EMIT(PPC_RAW_OR(tmp2_reg, tmp2_reg, src_reg));
break;
case BPF_XOR:
case BPF_XOR | BPF_FETCH:
EMIT(PPC_RAW_XOR(tmp2_reg, tmp2_reg, src_reg));
break;
default:
@ -807,13 +815,17 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, struct codegen_context *
return -EOPNOTSUPP;
}
/* store result back */
/* store new value */
if (size == BPF_DW)
EMIT(PPC_RAW_STDCX(tmp2_reg, tmp1_reg, dst_reg));
else
EMIT(PPC_RAW_STWCX(tmp2_reg, tmp1_reg, dst_reg));
/* we're done if this succeeded */
PPC_BCC_SHORT(COND_NE, tmp_idx);
/* For the BPF_FETCH variant, get old value into src_reg */
if (imm & BPF_FETCH)
EMIT(PPC_RAW_MR(src_reg, _R0));
break;
/*