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Thu, 11 Jul 2024 15:31:48 -0700 (PDT) From: Atish Patra Date: Thu, 11 Jul 2024 15:31:15 -0700 Subject: [PATCH v8 12/13] target/riscv: Do not setup pmu timer if OF is disabled MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20240711-smcntrpmf_v7-v8-12-b7c38ae7b263@rivosinc.com> References: <20240711-smcntrpmf_v7-v8-0-b7c38ae7b263@rivosinc.com> In-Reply-To: <20240711-smcntrpmf_v7-v8-0-b7c38ae7b263@rivosinc.com> To: qemu-riscv@nongnu.org, qemu-devel@nongnu.org Cc: 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 (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=2607:f8b0:4864:20::62d; envelope-from=atishp@rivosinc.com; helo=mail-pl1-x62d.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=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-ZohoMail-DKIM: pass (identity @rivosinc-com.20230601.gappssmtp.com) X-ZM-MESSAGEID: 1720737220306116600 The timer is setup function is invoked in both hpmcounter write and mcountinhibit write path. If the OF bit set, the LCOFI interrupt is disabled. There is no benefitting in setting up the qemu timer until LCOFI is cleared to indicate that interrupts can be fired again. Reviewed-by: Daniel Henrique Barboza Signed-off-by: Atish Patra --- target/riscv/pmu.c | 56 ++++++++++++++++++++++++++++++++++++++++++--------= ---- 1 file changed, 44 insertions(+), 12 deletions(-) diff --git a/target/riscv/pmu.c b/target/riscv/pmu.c index a4729f6c53bb..3cc0b3648cad 100644 --- a/target/riscv/pmu.c +++ b/target/riscv/pmu.c @@ -416,14 +416,49 @@ int riscv_pmu_update_event_map(CPURISCVState *env, ui= nt64_t value, return 0; } =20 +static bool pmu_hpmevent_is_of_set(CPURISCVState *env, uint32_t ctr_idx) +{ + target_ulong mhpmevent_val; + uint64_t of_bit_mask; + + if (riscv_cpu_mxl(env) =3D=3D MXL_RV32) { + mhpmevent_val =3D env->mhpmeventh_val[ctr_idx]; + of_bit_mask =3D MHPMEVENTH_BIT_OF; + } else { + mhpmevent_val =3D env->mhpmevent_val[ctr_idx]; + of_bit_mask =3D MHPMEVENT_BIT_OF; + } + + return get_field(mhpmevent_val, of_bit_mask); +} + +static bool pmu_hpmevent_set_of_if_clear(CPURISCVState *env, uint32_t ctr_= idx) +{ + target_ulong *mhpmevent_val; + uint64_t of_bit_mask; + + if (riscv_cpu_mxl(env) =3D=3D MXL_RV32) { + mhpmevent_val =3D &env->mhpmeventh_val[ctr_idx]; + of_bit_mask =3D MHPMEVENTH_BIT_OF; + } else { + mhpmevent_val =3D &env->mhpmevent_val[ctr_idx]; + of_bit_mask =3D MHPMEVENT_BIT_OF; + } + + if (!get_field(*mhpmevent_val, of_bit_mask)) { + *mhpmevent_val |=3D of_bit_mask; + return true; + } + + return false; +} + static void pmu_timer_trigger_irq(RISCVCPU *cpu, enum riscv_pmu_event_idx evt_idx) { uint32_t ctr_idx; CPURISCVState *env =3D &cpu->env; PMUCTRState *counter; - target_ulong *mhpmevent_val; - uint64_t of_bit_mask; int64_t irq_trigger_at; uint64_t curr_ctr_val, curr_ctrh_val; uint64_t ctr_val; @@ -439,12 +474,9 @@ static void pmu_timer_trigger_irq(RISCVCPU *cpu, return; } =20 - if (riscv_cpu_mxl(env) =3D=3D MXL_RV32) { - mhpmevent_val =3D &env->mhpmeventh_val[ctr_idx]; - of_bit_mask =3D MHPMEVENTH_BIT_OF; - } else { - mhpmevent_val =3D &env->mhpmevent_val[ctr_idx]; - of_bit_mask =3D MHPMEVENT_BIT_OF; + /* Generate interrupt only if OF bit is clear */ + if (pmu_hpmevent_is_of_set(env, ctr_idx)) { + return; } =20 counter =3D &env->pmu_ctrs[ctr_idx]; @@ -477,9 +509,7 @@ static void pmu_timer_trigger_irq(RISCVCPU *cpu, } =20 if (cpu->pmu_avail_ctrs & BIT(ctr_idx)) { - /* Generate interrupt only if OF bit is clear */ - if (!(*mhpmevent_val & of_bit_mask)) { - *mhpmevent_val |=3D of_bit_mask; + if (pmu_hpmevent_set_of_if_clear(env, ctr_idx)) { riscv_cpu_update_mip(env, MIP_LCOFIP, BOOL_TO_MASK(1)); } } @@ -502,7 +532,9 @@ int riscv_pmu_setup_timer(CPURISCVState *env, uint64_t = value, uint32_t ctr_idx) RISCVCPU *cpu =3D env_archcpu(env); PMUCTRState *counter =3D &env->pmu_ctrs[ctr_idx]; =20 - if (!riscv_pmu_counter_valid(cpu, ctr_idx) || !cpu->cfg.ext_sscofpmf) { + /* No need to setup a timer if LCOFI is disabled when OF is set */ + if (!riscv_pmu_counter_valid(cpu, ctr_idx) || !cpu->cfg.ext_sscofpmf || + pmu_hpmevent_is_of_set(env, ctr_idx)) { return -1; } =20 --=20 2.34.1