From patchwork Fri Jan 27 18:25:57 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Atish Kumar Patra X-Patchwork-Id: 13119176 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 288E3C38142 for ; Fri, 27 Jan 2023 18:27:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235413AbjA0S1H (ORCPT ); Fri, 27 Jan 2023 13:27:07 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58818 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235277AbjA0S0l (ORCPT ); Fri, 27 Jan 2023 13:26:41 -0500 Received: from mail-pl1-x62b.google.com (mail-pl1-x62b.google.com [IPv6:2607:f8b0:4864:20::62b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1EAC586246 for ; Fri, 27 Jan 2023 10:26:25 -0800 (PST) Received: by mail-pl1-x62b.google.com with SMTP id be8so5859452plb.7 for ; Fri, 27 Jan 2023 10:26:25 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rivosinc-com.20210112.gappssmtp.com; s=20210112; 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=GryYCsA0yB0D+er6B3vBmQcLGa+75ViLyEbdS+lBcgo=; b=lHG0Ie1rTp5lC9PUj6YQU6LNQROHBz/272/cbOF9xQ+6C+Cw38RwiPJZjGnwle8ZKl /G2yvqUFWR7sDaj9BoAfegij6enI9Yd6tCcexmxqWE2GURfI1iNdE2/RIGoFMtz5orEw f6WhXD9gUaM+VROyoeeNoYbfT8A6gbhBjlZg7lmvEjxFxLm/OX8OnQ0xAXIsOW6j+ivU 3uKQh0IKBpHrzlAxgCL6pmbbMWj5U4mFToSwd6wuLhO18fo5W8adTVtFaDFvw3HH7gbC HDBMBkhhbTEeC5mTDSDC6NgCl5gX3KvglWS3VmBMCsJ9m3riwfYFalE0q9I5S2cZ4krY 9Ozg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; 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=GryYCsA0yB0D+er6B3vBmQcLGa+75ViLyEbdS+lBcgo=; b=bEg52jFUGco/gnzLvmeGRoZ+8oBLqXws1m4yCejFKrAJ/JDwvuxqnK9wI7Clcboe+T gXAkH93JLDZLyglNAiywAlRFCR25qGHv7WKTmTh8uUSOD1Q3jfNMQO95h/bMnmG9mZSt HnfhPIaXo6amUWLhUJo6aNCLw5KoPbPyHAzEV8NiuQ+p0JlGUihz5ewJyl1kIkcP+d0H cvUgVilKhqEIW6PdiUEzjyMowo3F8rTcZ4Py2x3Sst3JiBX/C87533b7AC6FJ6WQqxIN ppIIeWiLjMuDK8NeGZMNixNHoqrlmRMnyVv5GXgOwuQGOlWw30NU/FQsHJWYpdMT07Md m7CA== X-Gm-Message-State: AFqh2koDhJL1i8E5ZDk1uN7n0Z6UL2QW9JiBrWCQOGagGbRYkaMuNwXu eIuDJiBjIIrBSGpVq9zeHgSlnA== X-Google-Smtp-Source: AMrXdXtwhrGvRJDshZBYkWk+n45XcY8z1cBLChY8kIMUk+uU4qS2IBsiCRy6f2rdq9A7AB4oC8aoNw== X-Received: by 2002:a17:903:1211:b0:194:d999:33f0 with SMTP id l17-20020a170903121100b00194d99933f0mr34943270plh.31.1674843985569; Fri, 27 Jan 2023 10:26:25 -0800 (PST) Received: from atishp.ba.rivosinc.com ([66.220.2.162]) by smtp.gmail.com with ESMTPSA id jc5-20020a17090325c500b00189d4c666c8sm3195219plb.153.2023.01.27.10.26.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 27 Jan 2023 10:26:25 -0800 (PST) From: Atish Patra To: linux-kernel@vger.kernel.org Cc: Atish Patra , Andrew Jones , Anup Patel , Atish Patra , Guo Ren , Heiko Stuebner , kvm-riscv@lists.infradead.org, kvm@vger.kernel.org, linux-riscv@lists.infradead.org, Mark Rutland , Palmer Dabbelt , Paul Walmsley , Sergey Matyukevich , Will Deacon Subject: [PATCH v3 13/14] RISC-V: KVM: Support firmware events Date: Fri, 27 Jan 2023 10:25:57 -0800 Message-Id: <20230127182558.2416400-14-atishp@rivosinc.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230127182558.2416400-1-atishp@rivosinc.com> References: <20230127182558.2416400-1-atishp@rivosinc.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org SBI PMU extension defines a set of firmware events which can provide useful information to guests about number of SBI calls. As hypervisor implements the SBI PMU extension, these firmware events corresponds to ecall invocations between VS->HS mode. All other firmware events will always report zero if monitored as KVM doesn't implement them. This patch adds all the infrastructure required to support firmware events. Signed-off-by: Atish Patra Reviewed-by: Anup Patel --- arch/riscv/include/asm/kvm_vcpu_pmu.h | 16 +++ arch/riscv/kvm/vcpu_pmu.c | 144 +++++++++++++++++++------- 2 files changed, 124 insertions(+), 36 deletions(-) diff --git a/arch/riscv/include/asm/kvm_vcpu_pmu.h b/arch/riscv/include/asm/kvm_vcpu_pmu.h index 022d45d..b235e7e 100644 --- a/arch/riscv/include/asm/kvm_vcpu_pmu.h +++ b/arch/riscv/include/asm/kvm_vcpu_pmu.h @@ -17,6 +17,14 @@ #define RISCV_KVM_MAX_FW_CTRS 32 #define RISCV_MAX_COUNTERS 64 +struct kvm_fw_event { + /* Current value of the event */ + unsigned long value; + + /* Event monitoring status */ + bool started; +}; + /* Per virtual pmu counter data */ struct kvm_pmc { u8 idx; @@ -25,11 +33,14 @@ struct kvm_pmc { union sbi_pmu_ctr_info cinfo; /* Event monitoring status */ bool started; + /* Monitoring event ID */ + unsigned long event_idx; }; /* PMU data structure per vcpu */ struct kvm_pmu { struct kvm_pmc pmc[RISCV_MAX_COUNTERS]; + struct kvm_fw_event fw_event[RISCV_KVM_MAX_FW_CTRS]; /* Number of the virtual firmware counters available */ int num_fw_ctrs; /* Number of the virtual hardware counters available */ @@ -52,6 +63,7 @@ struct kvm_pmu { { .base = CSR_CYCLE, .count = 31, .func = kvm_riscv_vcpu_pmu_read_hpm }, #endif +int kvm_riscv_vcpu_pmu_incr_fw(struct kvm_vcpu *vcpu, unsigned long fid); int kvm_riscv_vcpu_pmu_read_hpm(struct kvm_vcpu *vcpu, unsigned int csr_num, unsigned long *val, unsigned long new_val, unsigned long wr_mask); @@ -81,6 +93,10 @@ struct kvm_pmu { #define KVM_RISCV_VCPU_HPMCOUNTER_CSR_FUNCS \ { .base = 0, .count = 0, .func = NULL }, +static inline int kvm_riscv_vcpu_pmu_incr_fw(struct kvm_vcpu *vcpu, unsigned long fid) +{ + return 0; +} static inline int kvm_riscv_vcpu_pmu_init(struct kvm_vcpu *vcpu) { diff --git a/arch/riscv/kvm/vcpu_pmu.c b/arch/riscv/kvm/vcpu_pmu.c index 73dccf7..b8d6aba 100644 --- a/arch/riscv/kvm/vcpu_pmu.c +++ b/arch/riscv/kvm/vcpu_pmu.c @@ -203,12 +203,15 @@ static int pmu_ctr_read(struct kvm_vcpu *vcpu, unsigned long cidx, struct kvm_pmu *kvpmu = vcpu_to_pmu(vcpu); struct kvm_pmc *pmc; u64 enabled, running; + int fevent_code; pmc = &kvpmu->pmc[cidx]; - if (!pmc->perf_event) - return -EINVAL; - pmc->counter_val += perf_event_read_value(pmc->perf_event, &enabled, &running); + if (pmc->cinfo.type == SBI_PMU_CTR_TYPE_FW) { + fevent_code = get_event_code(pmc->event_idx); + pmc->counter_val = kvpmu->fw_event[fevent_code].value; + } else if (pmc->perf_event) + pmc->counter_val += perf_event_read_value(pmc->perf_event, &enabled, &running); *out_val = pmc->counter_val; return 0; @@ -224,6 +227,55 @@ static int kvm_pmu_validate_counter_mask(struct kvm_pmu *kvpmu, unsigned long ct return 0; } +static int kvm_pmu_create_perf_event(struct kvm_pmc *pmc, int ctr_idx, + struct perf_event_attr *attr, unsigned long flag, + unsigned long eidx, unsigned long evtdata) +{ + struct perf_event *event; + + kvm_pmu_release_perf_event(pmc); + pmc->idx = ctr_idx; + + attr->config = kvm_pmu_get_perf_event_config(eidx, evtdata); + if (flag & SBI_PMU_CFG_FLAG_CLEAR_VALUE) { + //TODO: Do we really want to clear the value in hardware counter + pmc->counter_val = 0; + } + + /* + * Set the default sample_period for now. The guest specified value + * will be updated in the start call. + */ + attr->sample_period = kvm_pmu_get_sample_period(pmc); + + event = perf_event_create_kernel_counter(attr, -1, current, NULL, pmc); + if (IS_ERR(event)) { + pr_err("kvm pmu event creation failed for eidx %lx: %ld\n", eidx, PTR_ERR(event)); + return PTR_ERR(event); + } + + pmc->perf_event = event; + if (flag & SBI_PMU_CFG_FLAG_AUTO_START) + perf_event_enable(pmc->perf_event); + + return 0; +} + +int kvm_riscv_vcpu_pmu_incr_fw(struct kvm_vcpu *vcpu, unsigned long fid) +{ + struct kvm_pmu *kvpmu = vcpu_to_pmu(vcpu); + struct kvm_fw_event *fevent; + + if (!kvpmu || fid >= SBI_PMU_FW_MAX) + return -EINVAL; + + fevent = &kvpmu->fw_event[fid]; + if (fevent->started) + fevent->value++; + + return 0; +} + int kvm_riscv_vcpu_pmu_read_hpm(struct kvm_vcpu *vcpu, unsigned int csr_num, unsigned long *val, unsigned long new_val, unsigned long wr_mask) @@ -276,6 +328,7 @@ int kvm_riscv_vcpu_pmu_ctr_start(struct kvm_vcpu *vcpu, unsigned long ctr_base, struct kvm_pmu *kvpmu = vcpu_to_pmu(vcpu); int i, pmc_index, sbiret = 0; struct kvm_pmc *pmc; + int fevent_code; if (kvm_pmu_validate_counter_mask(kvpmu, ctr_base, ctr_mask) < 0) { sbiret = SBI_ERR_INVALID_PARAM; @@ -290,7 +343,22 @@ int kvm_riscv_vcpu_pmu_ctr_start(struct kvm_vcpu *vcpu, unsigned long ctr_base, pmc = &kvpmu->pmc[pmc_index]; if (flag & SBI_PMU_START_FLAG_SET_INIT_VALUE) pmc->counter_val = ival; - if (pmc->perf_event) { + if (pmc->cinfo.type == SBI_PMU_CTR_TYPE_FW) { + fevent_code = get_event_code(pmc->event_idx); + if (fevent_code >= SBI_PMU_FW_MAX) { + sbiret = SBI_ERR_INVALID_PARAM; + goto out; + } + + /* Check if the counter was already started for some reason */ + if (kvpmu->fw_event[fevent_code].started) { + sbiret = SBI_ERR_ALREADY_STARTED; + continue; + } + + kvpmu->fw_event[fevent_code].started = true; + kvpmu->fw_event[fevent_code].value = pmc->counter_val; + } else if (pmc->perf_event) { if (unlikely(pmc->started)) { sbiret = SBI_ERR_ALREADY_STARTED; continue; @@ -317,6 +385,7 @@ int kvm_riscv_vcpu_pmu_ctr_stop(struct kvm_vcpu *vcpu, unsigned long ctr_base, int i, pmc_index, sbiret = 0; u64 enabled, running; struct kvm_pmc *pmc; + int fevent_code; if (kvm_pmu_validate_counter_mask(kvpmu, ctr_base, ctr_mask) < 0) { sbiret = SBI_ERR_INVALID_PARAM; @@ -329,7 +398,18 @@ int kvm_riscv_vcpu_pmu_ctr_stop(struct kvm_vcpu *vcpu, unsigned long ctr_base, if (!test_bit(pmc_index, kvpmu->pmc_in_use)) continue; pmc = &kvpmu->pmc[pmc_index]; - if (pmc->perf_event) { + if (pmc->cinfo.type == SBI_PMU_CTR_TYPE_FW) { + fevent_code = get_event_code(pmc->event_idx); + if (fevent_code >= SBI_PMU_FW_MAX) { + sbiret = SBI_ERR_INVALID_PARAM; + goto out; + } + + if (!kvpmu->fw_event[fevent_code].started) + sbiret = SBI_ERR_ALREADY_STOPPED; + + kvpmu->fw_event[fevent_code].started = false; + } else if (pmc->perf_event) { if (pmc->started) { /* Stop counting the counter */ perf_event_disable(pmc->perf_event); @@ -342,11 +422,14 @@ int kvm_riscv_vcpu_pmu_ctr_stop(struct kvm_vcpu *vcpu, unsigned long ctr_base, pmc->counter_val += perf_event_read_value(pmc->perf_event, &enabled, &running); kvm_pmu_release_perf_event(pmc); - clear_bit(pmc_index, kvpmu->pmc_in_use); } } else { sbiret = SBI_ERR_INVALID_PARAM; } + if (flag & SBI_PMU_STOP_FLAG_RESET) { + pmc->event_idx = SBI_PMU_EVENT_IDX_INVALID; + clear_bit(pmc_index, kvpmu->pmc_in_use); + } } out: @@ -361,12 +444,11 @@ int kvm_riscv_vcpu_pmu_ctr_cfg_match(struct kvm_vcpu *vcpu, unsigned long ctr_ba struct kvm_vcpu_sbi_ext_data *edata) { struct kvm_pmu *kvpmu = vcpu_to_pmu(vcpu); - struct perf_event *event; - int ctr_idx; + int ctr_idx, sbiret = 0, ret; u32 etype = kvm_pmu_get_perf_event_type(eidx); - u64 config; - struct kvm_pmc *pmc; - int sbiret = 0; + struct kvm_pmc *pmc = NULL; + bool is_fevent; + unsigned long event_code; struct perf_event_attr attr = { .type = etype, .size = sizeof(struct perf_event_attr), @@ -387,7 +469,9 @@ int kvm_riscv_vcpu_pmu_ctr_cfg_match(struct kvm_vcpu *vcpu, unsigned long ctr_ba goto out; } - if (kvm_pmu_is_fw_event(eidx)) { + event_code = get_event_code(eidx); + is_fevent = kvm_pmu_is_fw_event(eidx); + if (is_fevent && event_code >= SBI_PMU_FW_MAX) { sbiret = SBI_ERR_NOT_SUPPORTED; goto out; } @@ -412,33 +496,17 @@ int kvm_riscv_vcpu_pmu_ctr_cfg_match(struct kvm_vcpu *vcpu, unsigned long ctr_ba } pmc = &kvpmu->pmc[ctr_idx]; - kvm_pmu_release_perf_event(pmc); - pmc->idx = ctr_idx; - - config = kvm_pmu_get_perf_event_config(eidx, evtdata); - attr.config = config; - if (flag & SBI_PMU_CFG_FLAG_CLEAR_VALUE) { - //TODO: Do we really want to clear the value in hardware counter - pmc->counter_val = 0; - } - - /* - * Set the default sample_period for now. The guest specified value - * will be updated in the start call. - */ - attr.sample_period = kvm_pmu_get_sample_period(pmc); - - event = perf_event_create_kernel_counter(&attr, -1, current, NULL, pmc); - if (IS_ERR(event)) { - pr_err("kvm pmu event creation failed for eidx %lx: %ld\n", eidx, PTR_ERR(event)); - return PTR_ERR(event); + if (is_fevent) { + if (flag & SBI_PMU_CFG_FLAG_AUTO_START) + kvpmu->fw_event[event_code].started = true; + } else { + ret = kvm_pmu_create_perf_event(pmc, ctr_idx, &attr, flag, eidx, evtdata); + if (ret) + return ret; } set_bit(ctr_idx, kvpmu->pmc_in_use); - pmc->perf_event = event; - if (flag & SBI_PMU_CFG_FLAG_AUTO_START) - perf_event_enable(pmc->perf_event); - + pmc->event_idx = eidx; edata->out_val = ctr_idx; out: edata->err_val = sbiret; @@ -489,6 +557,7 @@ int kvm_riscv_vcpu_pmu_init(struct kvm_vcpu *vcpu) kvpmu->num_hw_ctrs = num_hw_ctrs; kvpmu->num_fw_ctrs = num_fw_ctrs; + memset(&kvpmu->fw_event, 0, SBI_PMU_FW_MAX * sizeof(struct kvm_fw_event)); /* * There is no correlation between the logical hardware counter and virtual counters. @@ -502,6 +571,7 @@ int kvm_riscv_vcpu_pmu_init(struct kvm_vcpu *vcpu) continue; pmc = &kvpmu->pmc[i]; pmc->idx = i; + pmc->event_idx = SBI_PMU_EVENT_IDX_INVALID; if (i < kvpmu->num_hw_ctrs) { kvpmu->pmc[i].cinfo.type = SBI_PMU_CTR_TYPE_HW; if (i < 3) @@ -540,8 +610,10 @@ void kvm_riscv_vcpu_pmu_deinit(struct kvm_vcpu *vcpu) pmc = &kvpmu->pmc[i]; pmc->counter_val = 0; kvm_pmu_release_perf_event(pmc); + pmc->event_idx = SBI_PMU_EVENT_IDX_INVALID; } bitmap_zero(kvpmu->pmc_in_use, RISCV_MAX_COUNTERS); + memset(&kvpmu->fw_event, 0, SBI_PMU_FW_MAX * sizeof(struct kvm_fw_event)); } void kvm_riscv_vcpu_pmu_reset(struct kvm_vcpu *vcpu)