arm64: insn: remove aarch64_insn_gen_prefetch()

There are no users of aarch64_insn_gen_prefetch(), and which encodes a
PRFM (immediate) with a hard-coded offset of 0.

Remove it for now; we can always restore it with tests if we need it in
future.

Signed-off-by: Mark Rutland <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Joey Gouly <[email protected]>
Cc: Will Deacon <[email protected]>
Reviewed-by: Joey Gouly <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Will Deacon <[email protected]>

Author: mrutland-arm

arch/arm64/include/asm/insn.h

@@ -580,10 +580,6 @@ u32 aarch64_insn_gen_extr(enum aarch64_insn_variant variant,
 			  enum aarch64_insn_register Rn,
 			  enum aarch64_insn_register Rd,
 			  u8 lsb);
-u32 aarch64_insn_gen_prefetch(enum aarch64_insn_register base,
-			      enum aarch64_insn_prfm_type type,
-			      enum aarch64_insn_prfm_target target,
-			      enum aarch64_insn_prfm_policy policy);
 #ifdef CONFIG_ARM64_LSE_ATOMICS
 u32 aarch64_insn_gen_atomic_ld_op(enum aarch64_insn_register result,
 				  enum aarch64_insn_register address,

arch/arm64/lib/insn.c

@@ -816,76 +816,6 @@ u32 aarch64_insn_gen_cas(enum aarch64_insn_register result,
 }
 #endif
 
-static u32 aarch64_insn_encode_prfm_imm(enum aarch64_insn_prfm_type type,
-					enum aarch64_insn_prfm_target target,
-					enum aarch64_insn_prfm_policy policy,
-					u32 insn)
-{
-	u32 imm_type = 0, imm_target = 0, imm_policy = 0;
-
-	switch (type) {
-	case AARCH64_INSN_PRFM_TYPE_PLD:
-		break;
-	case AARCH64_INSN_PRFM_TYPE_PLI:
-		imm_type = BIT(0);
-		break;
-	case AARCH64_INSN_PRFM_TYPE_PST:
-		imm_type = BIT(1);
-		break;
-	default:
-		pr_err("%s: unknown prfm type encoding %d\n", __func__, type);
-		return AARCH64_BREAK_FAULT;
-	}
-
-	switch (target) {
-	case AARCH64_INSN_PRFM_TARGET_L1:
-		break;
-	case AARCH64_INSN_PRFM_TARGET_L2:
-		imm_target = BIT(0);
-		break;
-	case AARCH64_INSN_PRFM_TARGET_L3:
-		imm_target = BIT(1);
-		break;
-	default:
-		pr_err("%s: unknown prfm target encoding %d\n", __func__, target);
-		return AARCH64_BREAK_FAULT;
-	}
-
-	switch (policy) {
-	case AARCH64_INSN_PRFM_POLICY_KEEP:
-		break;
-	case AARCH64_INSN_PRFM_POLICY_STRM:
-		imm_policy = BIT(0);
-		break;
-	default:
-		pr_err("%s: unknown prfm policy encoding %d\n", __func__, policy);
-		return AARCH64_BREAK_FAULT;
-	}
-
-	/* In this case, imm5 is encoded into Rt field. */
-	insn &= ~GENMASK(4, 0);
-	insn |= imm_policy | (imm_target << 1) | (imm_type << 3);
-
-	return insn;
-}
-
-u32 aarch64_insn_gen_prefetch(enum aarch64_insn_register base,
-			      enum aarch64_insn_prfm_type type,
-			      enum aarch64_insn_prfm_target target,
-			      enum aarch64_insn_prfm_policy policy)
-{
-	u32 insn = aarch64_insn_get_prfm_value();
-
-	insn = aarch64_insn_encode_ldst_size(AARCH64_INSN_SIZE_64, insn);
-
-	insn = aarch64_insn_encode_prfm_imm(type, target, policy, insn);
-
-	insn = aarch64_insn_encode_register(AARCH64_INSN_REGTYPE_RN, insn,
-					    base);
-
-	return aarch64_insn_encode_immediate(AARCH64_INSN_IMM_12, insn, 0);
-}
-
 u32 aarch64_insn_gen_add_sub_imm(enum aarch64_insn_register dst,
 				 enum aarch64_insn_register src,
 				 int imm, enum aarch64_insn_variant variant,