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([2602:47:d48a:1201:90b2:345f:bf0a:c412]) by smtp.gmail.com with ESMTPSA id n12-20020a170902e54c00b0018862bb3976sm3115421plf.308.2022.11.18.01.48.13 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 18 Nov 2022 01:48:13 -0800 (PST) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [PATCH for-8.0 08/29] accel/tcg: Honor atomicity of stores Date: Fri, 18 Nov 2022 01:47:33 -0800 Message-Id: <20221118094754.242910-9-richard.henderson@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221118094754.242910-1-richard.henderson@linaro.org> References: <20221118094754.242910-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2607:f8b0:4864:20::629; envelope-from=richard.henderson@linaro.org; helo=mail-pl1-x629.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Signed-off-by: Richard Henderson --- accel/tcg/cputlb.c | 177 +++++++++++++---- accel/tcg/user-exec.c | 12 +- accel/tcg/ldst_atomicity.c.inc | 336 +++++++++++++++++++++++++++++++++ 3 files changed, 480 insertions(+), 45 deletions(-) diff --git a/accel/tcg/cputlb.c b/accel/tcg/cputlb.c index cdc109b473..69f8a25a7f 100644 --- a/accel/tcg/cputlb.c +++ b/accel/tcg/cputlb.c @@ -2556,36 +2556,6 @@ Int128 cpu_ld16_le_mmu(CPUArchState *env, abi_ptr addr, * Store Helpers */ -static inline void QEMU_ALWAYS_INLINE -store_memop(void *haddr, uint64_t val, MemOp op) -{ - switch (op) { - case MO_UB: - stb_p(haddr, val); - break; - case MO_BEUW: - stw_be_p(haddr, val); - break; - case MO_LEUW: - stw_le_p(haddr, val); - break; - case MO_BEUL: - stl_be_p(haddr, val); - break; - case MO_LEUL: - stl_le_p(haddr, val); - break; - case MO_BEUQ: - stq_be_p(haddr, val); - break; - case MO_LEUQ: - stq_le_p(haddr, val); - break; - default: - qemu_build_not_reached(); - } -} - /** * do_st_mmio_leN: * @env: cpu context @@ -2632,16 +2602,145 @@ static uint64_t do_st_bytes_leN(MMULookupPageData *p, uint64_t val_le) return val_le; } +/** + * do_st_parts_leN + * @p: translation parameters + * @val_le: data to store + * + * As do_st_bytes_leN, but atomically on each aligned part. + */ +static uint64_t do_st_parts_leN(MMULookupPageData *p, uint64_t val_le) +{ + void *haddr = p->haddr; + int size = p->size; + + do { + int n; + + /* Find minimum of alignment and size */ + switch (((uintptr_t)haddr | size) & 7) { + case 4: + store_atomic4(haddr, le32_to_cpu(val_le)); + val_le >>= 32; + n = 4; + break; + case 2: + case 6: + store_atomic2(haddr, le16_to_cpu(val_le)); + val_le >>= 16; + n = 2; + break; + default: + stb_p(haddr, val_le); + val_le >>= 8; + n = 1; + break; + case 0: + g_assert_not_reached(); + } + haddr += n; + size -= n; + } while (size != 0); + return val_le; +} + +/** + * do_st_whole_le4 + * @p: translation parameters + * @val_le: data to store + * + * As do_st_bytes_leN, but atomically on each aligned part. + * Four aligned bytes are guaranteed to cover the store. + */ +static uint64_t do_st_whole_le4(MMULookupPageData *p, uint64_t val_le) +{ + int sz = p->size * 8; + int o = p->addr & 3; + int sh = o * 8; + uint32_t m = MAKE_64BIT_MASK(0, sz); + uint32_t v; + + if (HOST_BIG_ENDIAN) { + v = bswap32(val_le) >> sh; + m = bswap32(m) >> sh; + } else { + v = val_le << sh; + m <<= sh; + } + store_atom_insert_al4(p->haddr - o, v, m); + return val_le >> sz; +} + +/** + * do_st_whole_le8 + * @p: translation parameters + * @val_le: data to store + * + * As do_st_bytes_leN, but atomically on each aligned part. + * Eight aligned bytes are guaranteed to cover the store. + */ +static uint64_t do_st_whole_le8(MMULookupPageData *p, uint64_t val_le) +{ + int sz = p->size * 8; + int o = p->addr & 7; + int sh = o * 8; + uint64_t m = MAKE_64BIT_MASK(0, sz); + uint64_t v; + + if (HOST_BIG_ENDIAN) { + v = bswap64(val_le) >> sh; + m = bswap64(m) >> sh; + } else { + v = val_le << sh; + m <<= sh; + } + store_atom_insert_al8(p->haddr - o, v, m); + return val_le >> sz; +} + /* * Wrapper for the above. */ static uint64_t do_st_leN(CPUArchState *env, MMULookupPageData *p, - uint64_t val_le, int mmu_idx, uintptr_t ra) + uint64_t val_le, int mmu_idx, + MemOp mop, uintptr_t ra) { + MemOp atmax; + if (unlikely(p->flags & TLB_MMIO)) { return do_st_mmio_leN(env, p, val_le, mmu_idx, ra); - } else { + } + + switch (mop & MO_ATOM_MASK) { + case MO_ATOM_WITHIN16: + /* + * It is a given that we cross a page and therefore there is no + * atomicity for the load as a whole, but there may be a subobject + * as defined by ATMAX which does not cross a 16-byte boundary. + */ + atmax = mop & MO_ATMAX_MASK; + if (atmax == MO_ATMAX_SIZE) { + atmax = mop & MO_SIZE; + } else { + atmax >>= MO_ATMAX_SHIFT; + } + if (unlikely(p->size >= (1 << atmax))) { + if (!HAVE_al8_fast && p->size <= 4) { + return do_st_whole_le4(p, val_le); + } else if (HAVE_al8) { + return do_st_whole_le8(p, val_le); + } else { + cpu_loop_exit_atomic(env_cpu(env), ra); + } + } + /* fall through */ + case MO_ATOM_IFALIGN: + case MO_ATOM_NONE: return do_st_bytes_leN(p, val_le); + case MO_ATOM_SUBALIGN: + return do_st_parts_leN(p, val_le); + default: + g_assert_not_reached(); } } @@ -2686,7 +2785,7 @@ static void do_st2_mmu(CPUArchState *env, target_ulong addr, uint16_t val, if (l.memop & MO_BSWAP) { val = bswap16(val); } - store_memop(l.page[0].haddr, val, MO_UW); + store_atom_2(env, ra, l.page[0].haddr, l.memop, val); } } else { uint8_t a, b; @@ -2735,7 +2834,7 @@ static void do_st4_mmu(CPUArchState *env, target_ulong addr, uint32_t val, if (l.memop & MO_BSWAP) { val = bswap32(val); } - store_memop(l.page[0].haddr, val, MO_UL); + store_atom_4(env, ra, l.page[0].haddr, l.memop, val); } } else { assert_no_tlb_bswap; @@ -2744,8 +2843,8 @@ static void do_st4_mmu(CPUArchState *env, target_ulong addr, uint32_t val, if ((l.memop & MO_BSWAP) != MO_LE) { val = bswap32(val); } - val = do_st_leN(env, &l.page[0], val, l.mmu_idx, ra); - (void) do_st_leN(env, &l.page[1], val, l.mmu_idx, ra); + val = do_st_leN(env, &l.page[0], val, l.mmu_idx, l.memop, ra); + (void) do_st_leN(env, &l.page[1], val, l.mmu_idx, l.memop, ra); } } @@ -2781,7 +2880,7 @@ static void do_st8_mmu(CPUArchState *env, target_ulong addr, uint64_t val, if (l.memop & MO_BSWAP) { val = bswap64(val); } - store_memop(l.page[0].haddr, val, MO_UQ); + store_atom_8(env, ra, l.page[0].haddr, l.memop, val); } } else { assert_no_tlb_bswap; @@ -2790,8 +2889,8 @@ static void do_st8_mmu(CPUArchState *env, target_ulong addr, uint64_t val, if ((l.memop & MO_BSWAP) != MO_LE) { val = bswap64(val); } - val = do_st_leN(env, &l.page[0], val, l.mmu_idx, ra); - (void) do_st_leN(env, &l.page[1], val, l.mmu_idx, ra); + val = do_st_leN(env, &l.page[0], val, l.mmu_idx, l.memop, ra); + (void) do_st_leN(env, &l.page[1], val, l.mmu_idx, l.memop, ra); } } diff --git a/accel/tcg/user-exec.c b/accel/tcg/user-exec.c index ec721e5097..ddba8c9dd7 100644 --- a/accel/tcg/user-exec.c +++ b/accel/tcg/user-exec.c @@ -451,7 +451,7 @@ void cpu_stw_be_mmu(CPUArchState *env, abi_ptr addr, uint16_t val, validate_memop(oi, MO_BEUW); haddr = cpu_mmu_lookup(env, addr, oi, ra, MMU_DATA_STORE); - stw_be_p(haddr, val); + store_atom_2(env, ra, haddr, get_memop(oi), be16_to_cpu(val)); clear_helper_retaddr(); qemu_plugin_vcpu_mem_cb(env_cpu(env), addr, oi, QEMU_PLUGIN_MEM_W); } @@ -463,7 +463,7 @@ void cpu_stl_be_mmu(CPUArchState *env, abi_ptr addr, uint32_t val, validate_memop(oi, MO_BEUL); haddr = cpu_mmu_lookup(env, addr, oi, ra, MMU_DATA_STORE); - stl_be_p(haddr, val); + store_atom_4(env, ra, haddr, get_memop(oi), be32_to_cpu(val)); clear_helper_retaddr(); qemu_plugin_vcpu_mem_cb(env_cpu(env), addr, oi, QEMU_PLUGIN_MEM_W); } @@ -475,7 +475,7 @@ void cpu_stq_be_mmu(CPUArchState *env, abi_ptr addr, uint64_t val, validate_memop(oi, MO_BEUQ); haddr = cpu_mmu_lookup(env, addr, oi, ra, MMU_DATA_STORE); - stq_be_p(haddr, val); + store_atom_8(env, ra, haddr, get_memop(oi), be64_to_cpu(val)); clear_helper_retaddr(); qemu_plugin_vcpu_mem_cb(env_cpu(env), addr, oi, QEMU_PLUGIN_MEM_W); } @@ -487,7 +487,7 @@ void cpu_stw_le_mmu(CPUArchState *env, abi_ptr addr, uint16_t val, validate_memop(oi, MO_LEUW); haddr = cpu_mmu_lookup(env, addr, oi, ra, MMU_DATA_STORE); - stw_le_p(haddr, val); + store_atom_2(env, ra, haddr, get_memop(oi), le16_to_cpu(val)); clear_helper_retaddr(); qemu_plugin_vcpu_mem_cb(env_cpu(env), addr, oi, QEMU_PLUGIN_MEM_W); } @@ -499,7 +499,7 @@ void cpu_stl_le_mmu(CPUArchState *env, abi_ptr addr, uint32_t val, validate_memop(oi, MO_LEUL); haddr = cpu_mmu_lookup(env, addr, oi, ra, MMU_DATA_STORE); - stl_le_p(haddr, val); + store_atom_4(env, ra, haddr, get_memop(oi), le32_to_cpu(val)); clear_helper_retaddr(); qemu_plugin_vcpu_mem_cb(env_cpu(env), addr, oi, QEMU_PLUGIN_MEM_W); } @@ -511,7 +511,7 @@ void cpu_stq_le_mmu(CPUArchState *env, abi_ptr addr, uint64_t val, validate_memop(oi, MO_LEUQ); haddr = cpu_mmu_lookup(env, addr, oi, ra, MMU_DATA_STORE); - stq_le_p(haddr, val); + store_atom_8(env, ra, haddr, get_memop(oi), le64_to_cpu(val)); clear_helper_retaddr(); qemu_plugin_vcpu_mem_cb(env_cpu(env), addr, oi, QEMU_PLUGIN_MEM_W); } diff --git a/accel/tcg/ldst_atomicity.c.inc b/accel/tcg/ldst_atomicity.c.inc index decc9a2a16..8876c16371 100644 --- a/accel/tcg/ldst_atomicity.c.inc +++ b/accel/tcg/ldst_atomicity.c.inc @@ -21,6 +21,12 @@ #else # define HAVE_al16_fast false #endif +#if defined(CONFIG_ATOMIC128) || defined(CONFIG_CMPXCHG128) +# define HAVE_al16 true +#else +# define HAVE_al16 false +#endif + /** * required_atomicity: @@ -544,3 +550,333 @@ static uint64_t load_atom_8(CPUArchState *env, uintptr_t ra, g_assert_not_reached(); } } + +/** + * store_atomic2: + * @pv: host address + * @val: value to store + * + * Atomically store 2 aligned bytes to @pv. + */ +static inline void store_atomic2(void *pv, uint16_t val) +{ + uint16_t *p = __builtin_assume_aligned(pv, 2); + qatomic_set(p, val); +} + +/** + * store_atomic4: + * @pv: host address + * @val: value to store + * + * Atomically store 4 aligned bytes to @pv. + */ +static inline void store_atomic4(void *pv, uint32_t val) +{ + uint32_t *p = __builtin_assume_aligned(pv, 4); + qatomic_set(p, val); +} + +/** + * store_atomic8: + * @pv: host address + * @val: value to store + * + * Atomically store 8 aligned bytes to @pv. + */ +static inline void store_atomic8(void *pv, uint64_t val) +{ + uint64_t *p = __builtin_assume_aligned(pv, 8); + + qemu_build_assert(HAVE_al8); + qatomic_set__nocheck(p, val); +} + +/** + * store_atom_4x2 + */ +static inline void store_atom_4_by_2(void *pv, uint32_t val) +{ + uint16_t *p = __builtin_assume_aligned(pv, 2); + qatomic_set(p, val >> (HOST_BIG_ENDIAN ? 16 : 0)); + qatomic_set(p + 2, val >> (HOST_BIG_ENDIAN ? 0 : 16)); +} + +/** + * store_atom_8_by_2 + */ +static inline void store_atom_8_by_2(void *pv, uint64_t val) +{ + uint32_t *p = __builtin_assume_aligned(pv, 4); + qatomic_set(p, val >> (HOST_BIG_ENDIAN ? 32 : 0)); + qatomic_set(p + 4, val >> (HOST_BIG_ENDIAN ? 0 : 32)); +} + +/** + * store_atom_8_by_4 + */ +static inline void store_atom_8_by_4(void *pv, uint64_t val) +{ + uint16_t *p = __builtin_assume_aligned(pv, 2); + qatomic_set(p, val >> (HOST_BIG_ENDIAN ? 48 : 0)); + qatomic_set(p + 2, val >> (HOST_BIG_ENDIAN ? 32 : 16)); + qatomic_set(p + 4, val >> (HOST_BIG_ENDIAN ? 16 : 32)); + qatomic_set(p + 6, val >> (HOST_BIG_ENDIAN ? 0 : 48)); +} + +/** + * store_atom_insert_al4: + * @p: host address + * @val: shifted value to store + * @msk: mask for value to store + * + * Atomically store @val to @p, masked by @msk. + */ +static void store_atom_insert_al4(uint32_t *p, uint32_t val, uint32_t msk) +{ + uint32_t old, new; + + p = __builtin_assume_aligned(p, 4); + old = qatomic_read(p); + do { + new = (old & ~msk) | val; + } while (!__atomic_compare_exchange_n(p, &old, new, true, + __ATOMIC_RELAXED, __ATOMIC_RELAXED)); +} + +/** + * store_atom_insert_al8: + * @p: host address + * @val: shifted value to store + * @msk: mask for value to store + * + * Atomically store @val to @p masked by @msk. + */ +static void store_atom_insert_al8(uint64_t *p, uint64_t val, uint64_t msk) +{ + uint64_t old, new; + + qemu_build_assert(HAVE_al8); + p = __builtin_assume_aligned(p, 8); + old = qatomic_read__nocheck(p); + do { + new = (old & ~msk) | val; + } while (!__atomic_compare_exchange_n(p, &old, new, true, + __ATOMIC_RELAXED, __ATOMIC_RELAXED)); +} + +/** + * store_atom_insert_al16: + * @p: host address + * @val: shifted value to store + * @msk: mask for value to store + * + * Atomically store @val to @p masked by @msk. + */ +static void store_atom_insert_al16(Int128 *ps, Int128Alias val, Int128Alias msk) +{ +#if defined(CONFIG_ATOMIC128) + __uint128_t *pu, old, new; + + /* With CONFIG_ATOMIC128, we can avoid the memory barriers. */ + pu = __builtin_assume_aligned(ps, 16); + old = *pu; + do { + new = (old & ~msk.u) | val.u; + } while (!__atomic_compare_exchange_n(pu, &old, new, true, + __ATOMIC_RELAXED, __ATOMIC_RELAXED)); +#elif defined(CONFIG_CMPXCHG128) + __uint128_t *pu, old, new; + + /* + * Without CONFIG_ATOMIC128, __atomic_compare_exchange_n will always + * defer to libatomic, so we must use __sync_val_compare_and_swap_16 + * and accept the sequential consistency that comes with it. + */ + pu = __builtin_assume_aligned(ps, 16); + do { + old = *pu; + new = (old & ~msk.u) | val.u; + } while (!__sync_bool_compare_and_swap_16(pu, old, new)); +#else + qemu_build_not_reached(); +#endif +} + +/** + * store_atom_2: + * @p: host address + * @val: the value to store + * @memop: the full memory op + * + * Store 2 bytes to @p, honoring the atomicity of @memop. + */ +static void store_atom_2(CPUArchState *env, uintptr_t ra, + void *pv, MemOp memop, uint16_t val) +{ + uintptr_t pi = (uintptr_t)pv; + MemOp atmax; + + if (likely((pi & 1) == 0)) { + store_atomic2(pv, val); + return; + } + + atmax = required_atomicity(env, pi, memop); + if (atmax == MO_8) { + stw_he_p(pv, val); + return; + } + + /* The only case remaining is MO_ATOM_WITHIN16. */ + if (!HAVE_al8_fast && (pi & 3) == 1) { + /* Big or little endian, we want the middle two bytes. */ + store_atom_insert_al4(pv - 1, val << 8, 0x00ffff00); + return; + } + + if ((pi & 15) != 7) { + if (HAVE_al8) { + int sh = (pi & 7) * 8; + uint64_t v, m; + + pv = (void *)(pi & ~7); + if (HOST_BIG_ENDIAN) { + v = (uint64_t)val << (48 - sh); + m = 0xffffull << (48 - sh); + } else { + v = (uint64_t)val << sh; + m = 0xffffull << sh; + } + store_atom_insert_al8(pv, v, m); + return; + } + } else { + if (HAVE_al16) { + Int128 v, m; + + /* Big or little endian, we want the middle two bytes. */ + v = int128_lshift(int128_make64(val), 56); + m = int128_lshift(int128_make64(0xffff), 56); + store_atom_insert_al16(pv - 7, v, m); + return; + } + } + + cpu_loop_exit_atomic(env_cpu(env), ra); +} + +/** + * store_atom_4: + * @p: host address + * @val: the value to store + * @memop: the full memory op + * + * Store 4 bytes to @p, honoring the atomicity of @memop. + */ +static void store_atom_4(CPUArchState *env, uintptr_t ra, + void *pv, MemOp memop, uint32_t val) +{ + uintptr_t pi = (uintptr_t)pv; + MemOp atmax; + + if (likely((pi & 3) == 0)) { + store_atomic4(pv, val); + return; + } + + atmax = required_atomicity(env, pi, memop); + switch (atmax) { + case MO_8: + stl_he_p(pv, val); + return; + case MO_16: + store_atom_4_by_2(pv, val); + return; + case MO_32: + if ((pi & 7) < 4) { + if (HAVE_al8) { + int sh = (pi & 7) * 8; + uint64_t v, m; + + pv = (void *)(pi & ~7); + if (HOST_BIG_ENDIAN) { + v = (uint64_t)val << (32 - sh); + m = 0xffffffffull << (32 - sh); + } else { + v = (uint64_t)val << sh; + m = 0xffffffffull << sh; + } + store_atom_insert_al8(pv, v, m); + return; + } + } else { + if (HAVE_al16) { + int sh = (pi & 7) * 8; + Int128 v, m; + + v = int128_make64(val); + m = int128_make64(0xffffffffull); + v = int128_lshift(v, HOST_BIG_ENDIAN ? 96 - sh : sh); + m = int128_lshift(m, HOST_BIG_ENDIAN ? 96 - sh : sh); + + pv = (void *)(pi & ~15); + store_atom_insert_al16(pv, v, m); + return; + } + } + cpu_loop_exit_atomic(env_cpu(env), ra); + default: + g_assert_not_reached(); + } +} + +/** + * store_atom_8: + * @p: host address + * @val: the value to store + * @memop: the full memory op + * + * Store 8 bytes to @p, honoring the atomicity of @memop. + */ +static void store_atom_8(CPUArchState *env, uintptr_t ra, + void *pv, MemOp memop, uint64_t val) +{ + uintptr_t pi = (uintptr_t)pv; + MemOp atmax; + + if (HAVE_al8 && likely((pi & 7) == 0)) { + store_atomic8(pv, val); + return; + } + + atmax = required_atomicity(env, pi, memop); + switch (atmax) { + case MO_8: + stq_he_p(pv, val); + return; + case MO_16: + store_atom_8_by_2(pv, val); + return; + case MO_32: + store_atom_8_by_4(pv, val); + return; + case MO_64: + if (HAVE_al16) { + int sh = (pi & 7) * 8; + Int128 v, m; + + v = int128_make64(val); + m = int128_make64(-1ull); + v = int128_lshift(v, HOST_BIG_ENDIAN ? 64 - sh : sh); + m = int128_lshift(m, HOST_BIG_ENDIAN ? 64 - sh : sh); + + pv = (void *)(pi & ~15); + store_atom_insert_al16(pv, v, m); + return; + } + cpu_loop_exit_atomic(env_cpu(env), ra); + default: + g_assert_not_reached(); + } +} -- 2.34.1