From nobody Thu Nov 13 13:42:06 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 158045213282613.438951331120165; Thu, 30 Jan 2020 22:28:52 -0800 (PST) Received: from localhost ([::1]:49030 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ixPnP-0006RP-JW for importer@patchew.org; Fri, 31 Jan 2020 01:28:51 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:59927) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ixPVc-0008Pn-El for qemu-devel@nongnu.org; Fri, 31 Jan 2020 01:10:29 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ixPVb-0001VK-5p for qemu-devel@nongnu.org; Fri, 31 Jan 2020 01:10:28 -0500 Received: from bilbo.ozlabs.org ([2401:3900:2:1::2]:42585 helo=ozlabs.org) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1ixPVa-0000zO-Q3; Fri, 31 Jan 2020 01:10:27 -0500 Received: by ozlabs.org (Postfix, from userid 1007) id 4886Hx4xGLz9sT0; Fri, 31 Jan 2020 17:09:33 +1100 (AEDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gibson.dropbear.id.au; s=201602; t=1580450973; bh=1yWoeBrTfY8fxl3oZ9HWzpgPtT2+m2k9YK8vcQscFig=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Q3MYBh/jwmJtb1VUYOUxxPv+Z6cF+RDIwaP4bNY3B3rsKlUFfEsI2HLF4kfmvKlyS zH7jR2dvJosaYhvCeNrbsR0cGpTQYpvJ1IUjyFZg1Jc/f8UyokG/9USyuU/Yu1S30o WiRxhHlXkEiyGwHprl8j4Kn0+i8g3qk3NxP03V44= From: David Gibson To: peter.maydell@linaro.org Subject: [PULL 32/34] target/ppc: Use probe_access for LMW, STMW Date: Fri, 31 Jan 2020 17:09:22 +1100 Message-Id: <20200131060924.147449-33-david@gibson.dropbear.id.au> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200131060924.147449-1-david@gibson.dropbear.id.au> References: <20200131060924.147449-1-david@gibson.dropbear.id.au> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2401:3900:2:1::2 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: lvivier@redhat.com, Richard Henderson , qemu-devel@nongnu.org, groug@kaod.org, qemu-ppc@nongnu.org, Howard Spoelstra , David Gibson Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" From: Richard Henderson Use a minimum number of mmu lookups for the contiguous bytes that are accessed. If the lookup succeeds, we can finish the operation with host addresses only. Reported-by: Howard Spoelstra Signed-off-by: Richard Henderson Message-Id: <20200129235040.24022-3-richard.henderson@linaro.org> Tested-by: Howard Spoelstra Signed-off-by: David Gibson --- target/ppc/mem_helper.c | 45 +++++++++++++++++++++++++++++------------ 1 file changed, 32 insertions(+), 13 deletions(-) diff --git a/target/ppc/mem_helper.c b/target/ppc/mem_helper.c index 508d472a2f..e7d3a79d96 100644 --- a/target/ppc/mem_helper.c +++ b/target/ppc/mem_helper.c @@ -84,26 +84,45 @@ static void *probe_contiguous(CPUPPCState *env, target_= ulong addr, uint32_t nb, =20 void helper_lmw(CPUPPCState *env, target_ulong addr, uint32_t reg) { - for (; reg < 32; reg++) { - if (needs_byteswap(env)) { - env->gpr[reg] =3D bswap32(cpu_ldl_data_ra(env, addr, GETPC())); - } else { - env->gpr[reg] =3D cpu_ldl_data_ra(env, addr, GETPC()); + uintptr_t raddr =3D GETPC(); + int mmu_idx =3D cpu_mmu_index(env, false); + void *host =3D probe_contiguous(env, addr, (32 - reg) * 4, + MMU_DATA_LOAD, mmu_idx, raddr); + + if (likely(host)) { + /* Fast path -- the entire operation is in RAM at host. */ + for (; reg < 32; reg++) { + env->gpr[reg] =3D (uint32_t)ldl_be_p(host); + host +=3D 4; + } + } else { + /* Slow path -- at least some of the operation requires i/o. */ + for (; reg < 32; reg++) { + env->gpr[reg] =3D cpu_ldl_mmuidx_ra(env, addr, mmu_idx, raddr); + addr =3D addr_add(env, addr, 4); } - addr =3D addr_add(env, addr, 4); } } =20 void helper_stmw(CPUPPCState *env, target_ulong addr, uint32_t reg) { - for (; reg < 32; reg++) { - if (needs_byteswap(env)) { - cpu_stl_data_ra(env, addr, bswap32((uint32_t)env->gpr[reg]), - GETPC()); - } else { - cpu_stl_data_ra(env, addr, (uint32_t)env->gpr[reg], GETPC()); + uintptr_t raddr =3D GETPC(); + int mmu_idx =3D cpu_mmu_index(env, false); + void *host =3D probe_contiguous(env, addr, (32 - reg) * 4, + MMU_DATA_STORE, mmu_idx, raddr); + + if (likely(host)) { + /* Fast path -- the entire operation is in RAM at host. */ + for (; reg < 32; reg++) { + stl_be_p(host, env->gpr[reg]); + host +=3D 4; + } + } else { + /* Slow path -- at least some of the operation requires i/o. */ + for (; reg < 32; reg++) { + cpu_stl_mmuidx_ra(env, addr, env->gpr[reg], mmu_idx, raddr); + addr =3D addr_add(env, addr, 4); } - addr =3D addr_add(env, addr, 4); } } =20 --=20 2.24.1