From patchwork Wed Jun 26 23:57:28 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Atish Kumar Patra X-Patchwork-Id: 13713548 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 1C43EC30653 for ; Wed, 26 Jun 2024 23:59:41 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1sMcWO-0007q4-KN; Wed, 26 Jun 2024 19:57:52 -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 1sMcWL-0007na-JH for qemu-devel@nongnu.org; Wed, 26 Jun 2024 19:57:49 -0400 Received: from mail-pg1-x52f.google.com ([2607:f8b0:4864:20::52f]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1sMcWJ-0005Xp-Bh for qemu-devel@nongnu.org; Wed, 26 Jun 2024 19:57:49 -0400 Received: by mail-pg1-x52f.google.com with SMTP id 41be03b00d2f7-7182a634815so4022090a12.3 for ; Wed, 26 Jun 2024 16:57:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rivosinc-com.20230601.gappssmtp.com; s=20230601; t=1719446266; x=1720051066; darn=nongnu.org; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=WsjwmkKnlLSq/GJgOTR86moFb+I/3C1xyyIh/oZffps=; b=0bTmu71FcVJBlFbFXXdyFr0/PM4zlxzHKtP4k77ZG1s5m8DwoYha5KLM7gZ7BxxSwU zozmXPuzES7r2kofxKGO5NewToYKWjl5P/ZpzOBDGIMgki3o2TjQUyNbEw0HTyIQ741R y+F6/Ap6Lu/FteaW3g4bDGo5VGv9AGBK8q9CdiM6HCWB2QlCQHhcf3HKUJK3nz9XMjRB 2V1F1XjDddsNYBI96i0A8JoHxiOl54bNjSrARkp31vXx3kd8d3yUKp2DOai2Kl5O4dYw E8JVQLRhenmVPy6QuW6bnxkMoXrALB9lnZU6pwUpdWY6RWgeB/RZGWw4kueKmEzXx+Li mwHA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1719446266; x=1720051066; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=WsjwmkKnlLSq/GJgOTR86moFb+I/3C1xyyIh/oZffps=; b=udZjEDhhGdRhXAgW4X0xNw5/Nl8vfmoOxV2SAUHbaEbKlpdXv3T5wE/n+DU4JFV2H5 hBriTF95npr6ZY9yI8gXXPyIWghegByYe0vvTHvRRt2lYrgwESBwElAnxWpRhguRvq8p EOwbh/GiN7ZOpY/ki98JB0s8BGnyDe11jdW5fixEmCfMSVlcd3jSJsUyon7nU0eGOU4/ dZGyXrVTtNqJlgY5cpajgxkg0exFpzYKLKN/aYXElh/pWvPrpcjcTECzSKk2PRsMcEq+ POqQ3NiEgg7r/+8tMh0Qacy0lvAT6/Vwo78wiRM1psWUsxkfCWSFZNVowfNeuhImoHiO WKFA== X-Forwarded-Encrypted: i=1; AJvYcCU3qfAOFimnnMOaBIRtxMgReJTlmbuP9O6RqeUmGoB38AZlcMDwZcRd2qcnFt/NHp2UE0AXOjvsEnQOBjTjjG+/CteF8NM= X-Gm-Message-State: AOJu0YwIbHmVzVpKBcz6gkC5Y9+swG8FHAdCaeAIGz5OV9QqZ54ZukwX drFyY7YBtvCHqIE+31TpIpR1+FOdGx/XowSfFMXus9gJ56magkgv3xw6newUDNY= X-Google-Smtp-Source: AGHT+IHurjPf1NI+J9uvgCxuFXA100/cWQaaewfkhz9NvRYDi+IxTvWp98DwyzYg/nGGJv48GcY0yQ== X-Received: by 2002:a05:6a20:7a97:b0:1bd:22b6:121d with SMTP id adf61e73a8af0-1bd22b61306mr5671931637.52.1719446265845; Wed, 26 Jun 2024 16:57:45 -0700 (PDT) Received: from atishp.ba.rivosinc.com ([64.71.180.162]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-1faac998398sm630965ad.225.2024.06.26.16.57.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 26 Jun 2024 16:57:45 -0700 (PDT) From: Atish Patra Date: Wed, 26 Jun 2024 16:57:28 -0700 Subject: [PATCH v7 08/11] target/riscv: Enforce WARL behavior for scounteren/hcounteren MIME-Version: 1.0 Message-Id: <20240626-smcntrpmf_v7-v7-8-bb0f10af7fa9@rivosinc.com> References: <20240626-smcntrpmf_v7-v7-0-bb0f10af7fa9@rivosinc.com> In-Reply-To: <20240626-smcntrpmf_v7-v7-0-bb0f10af7fa9@rivosinc.com> To: qemu-riscv@nongnu.org, qemu-devel@nongnu.org Cc: Rajnesh Kanwal , Atish Patra , palmer@dabbelt.com, liwei1518@gmail.com, zhiwei_liu@linux.alibaba.com, bin.meng@windriver.com, dbarboza@ventanamicro.com, alistair.francis@wdc.com X-Mailer: b4 0.15-dev-13183 Received-SPF: pass client-ip=2607:f8b0:4864:20::52f; envelope-from=atishp@rivosinc.com; helo=mail-pg1-x52f.google.com 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, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable 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 scounteren/hcountern are also WARL registers similar to mcountern. Only set the bits for the available counters during the write to preserve the WARL behavior. Signed-off-by: Atish Patra Reviewed-by: Daniel Henrique Barboza Reviewed-by: Alistair Francis --- target/riscv/csr.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/target/riscv/csr.c b/target/riscv/csr.c index e4adfa324efe..6c1a884eec82 100644 --- a/target/riscv/csr.c +++ b/target/riscv/csr.c @@ -2994,7 +2994,11 @@ static RISCVException read_scounteren(CPURISCVState *env, int csrno, static RISCVException write_scounteren(CPURISCVState *env, int csrno, target_ulong val) { - env->scounteren = val; + RISCVCPU *cpu = env_archcpu(env); + + /* WARL register - disable unavailable counters */ + env->scounteren = val & (cpu->pmu_avail_ctrs | COUNTEREN_CY | COUNTEREN_TM | + COUNTEREN_IR); return RISCV_EXCP_NONE; } @@ -3653,7 +3657,11 @@ static RISCVException read_hcounteren(CPURISCVState *env, int csrno, static RISCVException write_hcounteren(CPURISCVState *env, int csrno, target_ulong val) { - env->hcounteren = val; + RISCVCPU *cpu = env_archcpu(env); + + /* WARL register - disable unavailable counters */ + env->hcounteren = val & (cpu->pmu_avail_ctrs | COUNTEREN_CY | COUNTEREN_TM | + COUNTEREN_IR); return RISCV_EXCP_NONE; }