From patchwork Sat Apr 20 15:17:31 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: 13636835 Received: from mail-pf1-f172.google.com (mail-pf1-f172.google.com [209.85.210.172]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id F09ED1494D2 for ; Fri, 19 Apr 2024 23:48:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713570494; cv=none; b=P+LCpUi8KI3Ddip94l1hToPMJkkajN/ryT5AxX0zXQEwgTYj+Zp3w/ihUVeXKgr8asT2xbII2YirWZyTo119q9vfPrTM8ZFpnZ5XO/rAXp29BPKzjcDI85T8J5yw/UsroviaDVlmQ6714y0Ani597J7gmGYxHZKb8tS4lIJ4gMM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713570494; c=relaxed/simple; bh=kMQT5NtU/3H2nu/pPUysYDHLMBWHMS5imSpFNSr8k7Q=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=SS0Q3ygNQGywY31JIHTAziuNTs7M04WGNCbIL/8UdQqa2qxjzM7aW5e5AqE272A11XB9hulCJJUXS2e7vzuuXteN0xcie5Cjl1yjD3umBAFxp5PI6TAbiWvz4rvwi+DSLYf+bAwrnmhR7kDYdsP8Dv3KWT5PfgC9cXZ6DX3YsiQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rivosinc.com; spf=pass smtp.mailfrom=rivosinc.com; dkim=pass (2048-bit key) header.d=rivosinc-com.20230601.gappssmtp.com header.i=@rivosinc-com.20230601.gappssmtp.com header.b=n76RWuKa; arc=none smtp.client-ip=209.85.210.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rivosinc.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=rivosinc.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=rivosinc-com.20230601.gappssmtp.com header.i=@rivosinc-com.20230601.gappssmtp.com header.b="n76RWuKa" Received: by mail-pf1-f172.google.com with SMTP id d2e1a72fcca58-6ed9fc77bbfso2086206b3a.1 for ; Fri, 19 Apr 2024 16:48:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rivosinc-com.20230601.gappssmtp.com; s=20230601; t=1713570492; x=1714175292; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=K/zHwGjJUr6D05KIztpGDsyJZSWroCpzob1LwbCt9c8=; b=n76RWuKahJGrkdRXqJIEf3XQhiBLYtxZaiuLHZBD7UF+S4ihg7sySC2K/xkijiuUpG DsIMiGhxyekNlr923Y1SblC/gp9ENE9lygp5tANmphgatam8RzeG0rQ06EOOyfQDFAJP ro3DX/TrSDi8sOojxXp+L4SPZKupMCMJASZV9/Mzpp50zCnGsF+RlHnunYTFkKDvGsf2 /cTjGD8nUyLL75Yc1RfAeRDgK/KwuwMO3MgARlDa6KTDvmtI1AgYz0DyeaPhZLQRnFSo 4MWljLs18tSyU9OECINvgpEpNuD3WUrrtm8iFVW4Vc9zDkBoPtS1eODYuaGZKEPH3Spt WrLA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1713570492; x=1714175292; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=K/zHwGjJUr6D05KIztpGDsyJZSWroCpzob1LwbCt9c8=; b=EsmIQXOgWFR2XwlWklpzy39wmOrKW+sf5zvYFmy5jc0aPzbYPYw+Wi7yJXKokMnDle fBkptFCWC9gJ3MVTOmo+98atw/v0PyRhHNWIx8dPTe9wt2aadMyPsiFC2eFbp8t1iC74 YHxAA8r8Drz/6L/nio1+FbKiZQY21Qy+72ONgSbx8Cp3u3ToOW4xKB2seDNFHZY+FXOW QigUqvu435mFfcNweX2Ru7OK049jC202LYH67D1kedVP+hgKUvraGuXc0u/eTJeoxUjb pdzNV5LJ6O5zZmjx/onxeZn7XVH8vkyElNEu/USQGbQE8/qBbte+efUipw1EIcdrBh93 D2rA== X-Forwarded-Encrypted: i=1; AJvYcCU8Ijvy4bbl3v9+T2MY4tlHJhvwemymBEn20tDjYeVW9IVND5HCySa0zmwhitCFC5CS7PRKtGRciwwMW9RSAsQFodtz X-Gm-Message-State: AOJu0YxfMnz4azjJZMGCuePUuJdXixFxzCOLcyM83IjwMsntUi44hNGl hfBTfx9AvZB5M+UqR/jy1/j88p22o/tTB8nSJ865RJAtt20cNhG2LPiOPqx75Ww= X-Google-Smtp-Source: AGHT+IEs3T3yx2Wfoao895EI90Rubsli+/oRcC36NhMV07FIBKOadqsA0HY8pguaPtpxEhZcF19avQ== X-Received: by 2002:a05:6a20:da8c:b0:1aa:5b05:7925 with SMTP id iy12-20020a056a20da8c00b001aa5b057925mr4706514pzb.4.1713570492271; Fri, 19 Apr 2024 16:48:12 -0700 (PDT) Received: from atishp.ba.rivosinc.com ([64.71.180.162]) by smtp.gmail.com with ESMTPSA id w17-20020a170902d11100b001e42f215f33sm3924017plw.85.2024.04.19.16.48.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 19 Apr 2024 16:48:11 -0700 (PDT) From: Atish Patra To: linux-kernel@vger.kernel.org Cc: Atish Patra , Andrew Jones , Anup Patel , Ajay Kaher , Albert Ou , Alexandre Ghiti , samuel.holland@sifive.com, Conor Dooley , Juergen Gross , kvm-riscv@lists.infradead.org, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-riscv@lists.infradead.org, Mark Rutland , Palmer Dabbelt , Paolo Bonzini , Paul Walmsley , Shuah Khan , virtualization@lists.linux.dev, Will Deacon , x86@kernel.org Subject: [PATCH v8 15/24] RISC-V: KVM: Support 64 bit firmware counters on RV32 Date: Sat, 20 Apr 2024 08:17:31 -0700 Message-Id: <20240420151741.962500-16-atishp@rivosinc.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240420151741.962500-1-atishp@rivosinc.com> References: <20240420151741.962500-1-atishp@rivosinc.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 The SBI v2.0 introduced a fw_read_hi function to read 64 bit firmware counters for RV32 based systems. Add infrastructure to support that. Reviewed-by: Andrew Jones Reviewed-by: Anup Patel Signed-off-by: Atish Patra --- arch/riscv/include/asm/kvm_vcpu_pmu.h | 4 ++- arch/riscv/kvm/vcpu_pmu.c | 44 ++++++++++++++++++++++++++- arch/riscv/kvm/vcpu_sbi_pmu.c | 6 ++++ 3 files changed, 52 insertions(+), 2 deletions(-) diff --git a/arch/riscv/include/asm/kvm_vcpu_pmu.h b/arch/riscv/include/asm/kvm_vcpu_pmu.h index 257f17641e00..55861b5d3382 100644 --- a/arch/riscv/include/asm/kvm_vcpu_pmu.h +++ b/arch/riscv/include/asm/kvm_vcpu_pmu.h @@ -20,7 +20,7 @@ static_assert(RISCV_KVM_MAX_COUNTERS <= 64); struct kvm_fw_event { /* Current value of the event */ - unsigned long value; + u64 value; /* Event monitoring status */ bool started; @@ -91,6 +91,8 @@ int kvm_riscv_vcpu_pmu_ctr_cfg_match(struct kvm_vcpu *vcpu, unsigned long ctr_ba struct kvm_vcpu_sbi_return *retdata); int kvm_riscv_vcpu_pmu_ctr_read(struct kvm_vcpu *vcpu, unsigned long cidx, struct kvm_vcpu_sbi_return *retdata); +int kvm_riscv_vcpu_pmu_fw_ctr_read_hi(struct kvm_vcpu *vcpu, unsigned long cidx, + struct kvm_vcpu_sbi_return *retdata); void kvm_riscv_vcpu_pmu_init(struct kvm_vcpu *vcpu); int kvm_riscv_vcpu_pmu_snapshot_set_shmem(struct kvm_vcpu *vcpu, unsigned long saddr_low, unsigned long saddr_high, unsigned long flags, diff --git a/arch/riscv/kvm/vcpu_pmu.c b/arch/riscv/kvm/vcpu_pmu.c index a801ed52dc9b..e1409ec9afc0 100644 --- a/arch/riscv/kvm/vcpu_pmu.c +++ b/arch/riscv/kvm/vcpu_pmu.c @@ -197,6 +197,36 @@ static int pmu_get_pmc_index(struct kvm_pmu *pmu, unsigned long eidx, return kvm_pmu_get_programmable_pmc_index(pmu, eidx, cbase, cmask); } +static int pmu_fw_ctr_read_hi(struct kvm_vcpu *vcpu, unsigned long cidx, + unsigned long *out_val) +{ + struct kvm_pmu *kvpmu = vcpu_to_pmu(vcpu); + struct kvm_pmc *pmc; + int fevent_code; + + if (!IS_ENABLED(CONFIG_32BIT)) { + pr_warn("%s: should be invoked for only RV32\n", __func__); + return -EINVAL; + } + + if (cidx >= kvm_pmu_num_counters(kvpmu) || cidx == 1) { + pr_warn("Invalid counter id [%ld]during read\n", cidx); + return -EINVAL; + } + + pmc = &kvpmu->pmc[cidx]; + + if (pmc->cinfo.type != SBI_PMU_CTR_TYPE_FW) + return -EINVAL; + + fevent_code = get_event_code(pmc->event_idx); + pmc->counter_val = kvpmu->fw_event[fevent_code].value; + + *out_val = pmc->counter_val >> 32; + + return 0; +} + static int pmu_ctr_read(struct kvm_vcpu *vcpu, unsigned long cidx, unsigned long *out_val) { @@ -705,6 +735,18 @@ int kvm_riscv_vcpu_pmu_ctr_cfg_match(struct kvm_vcpu *vcpu, unsigned long ctr_ba return 0; } +int kvm_riscv_vcpu_pmu_fw_ctr_read_hi(struct kvm_vcpu *vcpu, unsigned long cidx, + struct kvm_vcpu_sbi_return *retdata) +{ + int ret; + + ret = pmu_fw_ctr_read_hi(vcpu, cidx, &retdata->out_val); + if (ret == -EINVAL) + retdata->err_val = SBI_ERR_INVALID_PARAM; + + return 0; +} + int kvm_riscv_vcpu_pmu_ctr_read(struct kvm_vcpu *vcpu, unsigned long cidx, struct kvm_vcpu_sbi_return *retdata) { @@ -778,7 +820,7 @@ void kvm_riscv_vcpu_pmu_init(struct kvm_vcpu *vcpu) pmc->cinfo.csr = CSR_CYCLE + i; } else { pmc->cinfo.type = SBI_PMU_CTR_TYPE_FW; - pmc->cinfo.width = BITS_PER_LONG - 1; + pmc->cinfo.width = 63; } } diff --git a/arch/riscv/kvm/vcpu_sbi_pmu.c b/arch/riscv/kvm/vcpu_sbi_pmu.c index d3e7625fb2d2..cf111de51bdb 100644 --- a/arch/riscv/kvm/vcpu_sbi_pmu.c +++ b/arch/riscv/kvm/vcpu_sbi_pmu.c @@ -64,6 +64,12 @@ static int kvm_sbi_ext_pmu_handler(struct kvm_vcpu *vcpu, struct kvm_run *run, case SBI_EXT_PMU_COUNTER_FW_READ: ret = kvm_riscv_vcpu_pmu_ctr_read(vcpu, cp->a0, retdata); break; + case SBI_EXT_PMU_COUNTER_FW_READ_HI: + if (IS_ENABLED(CONFIG_32BIT)) + ret = kvm_riscv_vcpu_pmu_fw_ctr_read_hi(vcpu, cp->a0, retdata); + else + retdata->out_val = 0; + break; case SBI_EXT_PMU_SNAPSHOT_SET_SHMEM: ret = kvm_riscv_vcpu_pmu_snapshot_set_shmem(vcpu, cp->a0, cp->a1, cp->a2, retdata); break;