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([2602:47:d490:6901:1eed:f77f:f320:8b14]) by smtp.gmail.com with ESMTPSA id u1-20020a17090282c100b001bbf7fd354csm2185568plz.213.2023.08.04.15.00.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 04 Aug 2023 15:00:35 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Cc: =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= Subject: [PATCH v9 02/24] accel/tcg: Issue wider aligned i/o in do_{ld, st}_mmio_* Date: Fri, 4 Aug 2023 15:00:10 -0700 Message-Id: <20230804220032.295411-3-richard.henderson@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230804220032.295411-1-richard.henderson@linaro.org> References: <20230804220032.295411-1-richard.henderson@linaro.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2607:f8b0:4864:20::62b; envelope-from=richard.henderson@linaro.org; helo=mail-pl1-x62b.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+patch=linaro.org@nongnu.org Sender: qemu-devel-bounces+patch=linaro.org@nongnu.org If the address and size are aligned, send larger chunks to the memory subsystem. This will be required to make more use of these helpers. Reviewed-by: Philippe Mathieu-Daudé Signed-off-by: Richard Henderson --- accel/tcg/cputlb.c | 76 +++++++++++++++++++++++++++++++++++++++++----- 1 file changed, 69 insertions(+), 7 deletions(-) diff --git a/accel/tcg/cputlb.c b/accel/tcg/cputlb.c index 23386ecfde..a308cb7534 100644 --- a/accel/tcg/cputlb.c +++ b/accel/tcg/cputlb.c @@ -2081,10 +2081,40 @@ static uint64_t do_ld_mmio_beN(CPUArchState *env, CPUTLBEntryFull *full, uint64_t ret_be, vaddr addr, int size, int mmu_idx, MMUAccessType type, uintptr_t ra) { - for (int i = 0; i < size; i++) { - uint8_t x = io_readx(env, full, mmu_idx, addr + i, ra, type, MO_UB); - ret_be = (ret_be << 8) | x; - } + uint64_t t; + + tcg_debug_assert(size > 0 && size <= 8); + do { + /* Read aligned pieces up to 8 bytes. */ + switch ((size | (int)addr) & 7) { + case 1: + case 3: + case 5: + case 7: + t = io_readx(env, full, mmu_idx, addr, ra, type, MO_UB); + ret_be = (ret_be << 8) | t; + size -= 1; + addr += 1; + break; + case 2: + case 6: + t = io_readx(env, full, mmu_idx, addr, ra, type, MO_BEUW); + ret_be = (ret_be << 16) | t; + size -= 2; + addr += 2; + break; + case 4: + t = io_readx(env, full, mmu_idx, addr, ra, type, MO_BEUL); + ret_be = (ret_be << 32) | t; + size -= 4; + addr += 4; + break; + case 0: + return io_readx(env, full, mmu_idx, addr, ra, type, MO_BEUQ); + default: + qemu_build_not_reached(); + } + } while (size); return ret_be; } @@ -2680,9 +2710,41 @@ static uint64_t do_st_mmio_leN(CPUArchState *env, CPUTLBEntryFull *full, uint64_t val_le, vaddr addr, int size, int mmu_idx, uintptr_t ra) { - for (int i = 0; i < size; i++, val_le >>= 8) { - io_writex(env, full, mmu_idx, val_le, addr + i, ra, MO_UB); - } + tcg_debug_assert(size > 0 && size <= 8); + + do { + /* Store aligned pieces up to 8 bytes. */ + switch ((size | (int)addr) & 7) { + case 1: + case 3: + case 5: + case 7: + io_writex(env, full, mmu_idx, val_le, addr, ra, MO_UB); + val_le >>= 8; + size -= 1; + addr += 1; + break; + case 2: + case 6: + io_writex(env, full, mmu_idx, val_le, addr, ra, MO_LEUW); + val_le >>= 16; + size -= 2; + addr += 2; + break; + case 4: + io_writex(env, full, mmu_idx, val_le, addr, ra, MO_LEUL); + val_le >>= 32; + size -= 4; + addr += 4; + break; + case 0: + io_writex(env, full, mmu_idx, val_le, addr, ra, MO_LEUQ); + return 0; + default: + qemu_build_not_reached(); + } + } while (size); + return val_le; }