treewide: remove files for building 5.10 kernel

[openwrt/openwrt.git] / target / linux / generic / backport-5.10 / 050-v5.16-04-mips-bpf-Add-JIT-workarounds-for-CPU-errata.patch

diff --git a/target/linux/generic/backport-5.10/050-v5.16-04-mips-bpf-Add-JIT-workarounds-for-CPU-errata.patch b/target/linux/generic/backport-5.10/050-v5.16-04-mips-bpf-Add-JIT-workarounds-for-CPU-errata.patch
deleted file mode 100644 (file)
index 63553eb..0000000
--- a/target/linux/generic/backport-5.10/050-v5.16-04-mips-bpf-Add-JIT-workarounds-for-CPU-errata.patch
+++ /dev/null
@@ -1,120 +0,0 @@
-From: Johan Almbladh <johan.almbladh@anyfinetworks.com>
-Date: Tue, 5 Oct 2021 18:54:06 +0200
-Subject: [PATCH] mips: bpf: Add JIT workarounds for CPU errata
-
-This patch adds workarounds for the following CPU errata to the MIPS
-eBPF JIT, if enabled in the kernel configuration.
-
-  - R10000 ll/sc weak ordering
-  - Loongson-3 ll/sc weak ordering
-  - Loongson-2F jump hang
-
-The Loongson-2F nop errata is implemented in uasm, which the JIT uses,
-so no additional mitigations are needed for that.
-
-Signed-off-by: Johan Almbladh <johan.almbladh@anyfinetworks.com>
-Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
----
-
---- a/arch/mips/net/bpf_jit_comp.c
-+++ b/arch/mips/net/bpf_jit_comp.c
-@@ -404,6 +404,7 @@ void emit_alu_r(struct jit_context *ctx,
- /* Atomic read-modify-write (32-bit) */
- void emit_atomic_r(struct jit_context *ctx, u8 dst, u8 src, s16 off, u8 code)
- {
-+      LLSC_sync(ctx);
-       emit(ctx, ll, MIPS_R_T9, off, dst);
-       switch (code) {
-       case BPF_ADD:
-@@ -420,18 +421,19 @@ void emit_atomic_r(struct jit_context *c
-               break;
-       }
-       emit(ctx, sc, MIPS_R_T8, off, dst);
--      emit(ctx, beqz, MIPS_R_T8, -16);
-+      emit(ctx, LLSC_beqz, MIPS_R_T8, -16 - LLSC_offset);
-       emit(ctx, nop); /* Delay slot */
- }
- 
- /* Atomic compare-and-exchange (32-bit) */
- void emit_cmpxchg_r(struct jit_context *ctx, u8 dst, u8 src, u8 res, s16 off)
- {
-+      LLSC_sync(ctx);
-       emit(ctx, ll, MIPS_R_T9, off, dst);
-       emit(ctx, bne, MIPS_R_T9, res, 12);
-       emit(ctx, move, MIPS_R_T8, src);     /* Delay slot */
-       emit(ctx, sc, MIPS_R_T8, off, dst);
--      emit(ctx, beqz, MIPS_R_T8, -20);
-+      emit(ctx, LLSC_beqz, MIPS_R_T8, -20 - LLSC_offset);
-       emit(ctx, move, res, MIPS_R_T9);     /* Delay slot */
-       clobber_reg(ctx, res);
- }
---- a/arch/mips/net/bpf_jit_comp.h
-+++ b/arch/mips/net/bpf_jit_comp.h
-@@ -87,7 +87,7 @@ struct jit_context {
- };
- 
- /* Emit the instruction if the JIT memory space has been allocated */
--#define emit(ctx, func, ...)                                  \
-+#define __emit(ctx, func, ...)                                        \
- do {                                                          \
-       if ((ctx)->target != NULL) {                            \
-               u32 *p = &(ctx)->target[ctx->jit_index];        \
-@@ -95,6 +95,30 @@ do {                                                                \
-       }                                                       \
-       (ctx)->jit_index++;                                     \
- } while (0)
-+#define emit(...) __emit(__VA_ARGS__)
-+
-+/* Workaround for R10000 ll/sc errata */
-+#ifdef CONFIG_WAR_R10000
-+#define LLSC_beqz     beqzl
-+#else
-+#define LLSC_beqz     beqz
-+#endif
-+
-+/* Workaround for Loongson-3 ll/sc errata */
-+#ifdef CONFIG_CPU_LOONGSON3_WORKAROUNDS
-+#define LLSC_sync(ctx)        emit(ctx, sync, 0)
-+#define LLSC_offset   4
-+#else
-+#define LLSC_sync(ctx)
-+#define LLSC_offset   0
-+#endif
-+
-+/* Workaround for Loongson-2F jump errata */
-+#ifdef CONFIG_CPU_JUMP_WORKAROUNDS
-+#define JALR_MASK     0xffffffffcfffffffULL
-+#else
-+#define JALR_MASK     (~0ULL)
-+#endif
- 
- /*
-  * Mark a BPF register as accessed, it needs to be
---- a/arch/mips/net/bpf_jit_comp64.c
-+++ b/arch/mips/net/bpf_jit_comp64.c
-@@ -375,6 +375,7 @@ static void emit_atomic_r64(struct jit_c
-       u8 t1 = MIPS_R_T6;
-       u8 t2 = MIPS_R_T7;
- 
-+      LLSC_sync(ctx);
-       emit(ctx, lld, t1, off, dst);
-       switch (code) {
-       case BPF_ADD:
-@@ -391,7 +392,7 @@ static void emit_atomic_r64(struct jit_c
-               break;
-       }
-       emit(ctx, scd, t2, off, dst);
--      emit(ctx, beqz, t2, -16);
-+      emit(ctx, LLSC_beqz, t2, -16 - LLSC_offset);
-       emit(ctx, nop); /* Delay slot */
- }
- 
-@@ -414,7 +415,7 @@ static int emit_call(struct jit_context
-       push_regs(ctx, ctx->clobbered & JIT_CALLER_REGS, 0, 0);
- 
-       /* Emit function call */
--      emit_mov_i64(ctx, tmp, addr);
-+      emit_mov_i64(ctx, tmp, addr & JALR_MASK);
-       emit(ctx, jalr, MIPS_R_RA, tmp);
-       emit(ctx, nop); /* Delay slot */
-