From nobody Sat Nov 15 00:07:22 2025 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; 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 1759204532020901.6136218306863; Mon, 29 Sep 2025 20:55:32 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1v3RQy-0000vQ-UZ; Mon, 29 Sep 2025 23:53:49 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1v3RQx-0000ui-Hw for qemu-devel@nongnu.org; Mon, 29 Sep 2025 23:53:47 -0400 Received: from mail.loongson.cn ([114.242.206.163]) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1v3RQq-0001pd-Vd for qemu-devel@nongnu.org; Mon, 29 Sep 2025 23:53:47 -0400 Received: from loongson.cn (unknown [10.2.5.213]) by gateway (Coremail) with SMTP id _____8Dx+tE_VNtoyGsQAA--.35130S3; Tue, 30 Sep 2025 11:53:35 +0800 (CST) Received: from localhost.localdomain (unknown [10.2.5.213]) by front1 (Coremail) with SMTP id qMiowJBxC8E8VNtoak+_AA--.40492S7; Tue, 30 Sep 2025 11:53:35 +0800 (CST) From: Bibo Mao To: Song Gao , Richard Henderson Cc: Jiaxun Yang , qemu-devel@nongnu.org Subject: [PATCH v4 05/13] target/loongarch: Add common function get_tlb_random_index() Date: Tue, 30 Sep 2025 11:53:24 +0800 Message-Id: <20250930035332.2609520-6-maobibo@loongson.cn> X-Mailer: git-send-email 2.39.3 In-Reply-To: <20250930035332.2609520-1-maobibo@loongson.cn> References: <20250930035332.2609520-1-maobibo@loongson.cn> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: qMiowJBxC8E8VNtoak+_AA--.40492S7 X-CM-SenderInfo: xpdruxter6z05rqj20fqof0/ X-Coremail-Antispam: 1Uk129KBjDUn29KB7ZKAUJUUUUU529EdanIXcx71UUUUU7KY7 ZEXasCq-sGcSsGvfJ3UbIjqfuFe4nvWSU5nxnvy29KBjDU0xBIdaVrnUUvcSsGvfC2Kfnx nUUI43ZEXa7xR_UUUUUUUUU== 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; Received-SPF: pass client-ip=114.242.206.163; envelope-from=maobibo@loongson.cn; helo=mail.loongson.cn X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, 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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZM-MESSAGEID: 1759204534775116600 Content-Type: text/plain; charset="utf-8" With software PTW system, tlb index is calculated randomly when new TLB entry is added. For hardware PTW, it is the same logic to add new TLB entry. Here common function get_tlb_random_index() is added to get random tlb index when adding new TLB entry. Signed-off-by: Bibo Mao --- target/loongarch/tcg/tlb_helper.c | 38 +++++++++++++++++++------------ 1 file changed, 24 insertions(+), 14 deletions(-) diff --git a/target/loongarch/tcg/tlb_helper.c b/target/loongarch/tcg/tlb_h= elper.c index 01ade068ab..c062efc7b8 100644 --- a/target/loongarch/tcg/tlb_helper.c +++ b/target/loongarch/tcg/tlb_helper.c @@ -381,31 +381,22 @@ void helper_tlbwr(CPULoongArchState *env) *old =3D new; } =20 -void helper_tlbfill(CPULoongArchState *env) +static int get_tlb_random_index(CPULoongArchState *env, vaddr addr, + int pagesize) { - uint64_t address, entryhi; + uint64_t address; int index, set, i, stlb_idx; - uint16_t pagesize, stlb_ps; + uint16_t stlb_ps; uint16_t asid, tlb_asid; LoongArchTLB *tlb; uint8_t tlb_e; =20 - if (FIELD_EX64(env->CSR_TLBRERA, CSR_TLBRERA, ISTLBR)) { - entryhi =3D env->CSR_TLBREHI; - /* Validity of pagesize is checked in helper_ldpte() */ - pagesize =3D FIELD_EX64(env->CSR_TLBREHI, CSR_TLBREHI, PS); - } else { - entryhi =3D env->CSR_TLBEHI; - /* Validity of pagesize is checked in helper_tlbrd() */ - pagesize =3D FIELD_EX64(env->CSR_TLBIDX, CSR_TLBIDX, PS); - } - /* Validity of stlb_ps is checked in helper_csrwr_stlbps() */ stlb_ps =3D FIELD_EX64(env->CSR_STLBPS, CSR_STLBPS, PS); asid =3D FIELD_EX64(env->CSR_ASID, CSR_ASID, ASID); if (pagesize =3D=3D stlb_ps) { /* Only write into STLB bits [47:13] */ - address =3D entryhi & ~MAKE_64BIT_MASK(0, R_CSR_TLBEHI_64_VPPN_SHI= FT); + address =3D addr & ~MAKE_64BIT_MASK(0, R_CSR_TLBEHI_64_VPPN_SHIFT); set =3D -1; stlb_idx =3D (address >> (stlb_ps + 1)) & 0xff; /* [0,255] */ for (i =3D 0; i < 8; ++i) { @@ -450,6 +441,25 @@ void helper_tlbfill(CPULoongArchState *env) } } =20 + return index; +} + +void helper_tlbfill(CPULoongArchState *env) +{ + vaddr entryhi; + int index, pagesize; + + if (FIELD_EX64(env->CSR_TLBRERA, CSR_TLBRERA, ISTLBR)) { + entryhi =3D env->CSR_TLBREHI; + /* Validity of pagesize is checked in helper_ldpte() */ + pagesize =3D FIELD_EX64(env->CSR_TLBREHI, CSR_TLBREHI, PS); + } else { + entryhi =3D env->CSR_TLBEHI; + /* Validity of pagesize is checked in helper_tlbrd() */ + pagesize =3D FIELD_EX64(env->CSR_TLBIDX, CSR_TLBIDX, PS); + } + + index =3D get_tlb_random_index(env, entryhi, pagesize); invalidate_tlb(env, index); fill_tlb_entry(env, env->tlb + index); } --=20 2.39.3