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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: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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 <=3D 64); =20 struct kvm_fw_event { /* Current value of the event */ - unsigned long value; + u64 value; =20 /* Event monitoring status */ bool started; @@ -91,6 +91,8 @@ int kvm_riscv_vcpu_pmu_ctr_cfg_match(struct kvm_vcpu *vcp= u, 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, unsi= gned long eidx, return kvm_pmu_get_programmable_pmc_index(pmu, eidx, cbase, cmask); } =20 +static int pmu_fw_ctr_read_hi(struct kvm_vcpu *vcpu, unsigned long cidx, + unsigned long *out_val) +{ + struct kvm_pmu *kvpmu =3D 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 >=3D kvm_pmu_num_counters(kvpmu) || cidx =3D=3D 1) { + pr_warn("Invalid counter id [%ld]during read\n", cidx); + return -EINVAL; + } + + pmc =3D &kvpmu->pmc[cidx]; + + if (pmc->cinfo.type !=3D SBI_PMU_CTR_TYPE_FW) + return -EINVAL; + + fevent_code =3D get_event_code(pmc->event_idx); + pmc->counter_val =3D kvpmu->fw_event[fevent_code].value; + + *out_val =3D 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; } =20 +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 =3D pmu_fw_ctr_read_hi(vcpu, cidx, &retdata->out_val); + if (ret =3D=3D -EINVAL) + retdata->err_val =3D 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 =3D CSR_CYCLE + i; } else { pmc->cinfo.type =3D SBI_PMU_CTR_TYPE_FW; - pmc->cinfo.width =3D BITS_PER_LONG - 1; + pmc->cinfo.width =3D 63; } } =20 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 =3D 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 =3D kvm_riscv_vcpu_pmu_fw_ctr_read_hi(vcpu, cp->a0, retdata); + else + retdata->out_val =3D 0; + break; case SBI_EXT_PMU_SNAPSHOT_SET_SHMEM: ret =3D kvm_riscv_vcpu_pmu_snapshot_set_shmem(vcpu, cp->a0, cp->a1, cp->= a2, retdata); break; --=20 2.34.1