From mboxrd@z Thu Jan 1 00:00:00 1970 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4A3A1C433F5 for ; Thu, 7 Oct 2021 23:35:12 +0000 (UTC) Received: from mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by mail.kernel.org (Postfix) with ESMTP id ECF0C61390 for ; Thu, 7 Oct 2021 23:35:11 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org ECF0C61390 Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=lists.cs.columbia.edu Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 839074B2BB; Thu, 7 Oct 2021 19:35:11 -0400 (EDT) X-Virus-Scanned: at lists.cs.columbia.edu Authentication-Results: mm01.cs.columbia.edu (amavisd-new); dkim=softfail (fail, message has been altered) header.i=@google.com Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id OD8+TxXtNtxe; Thu, 7 Oct 2021 19:35:10 -0400 (EDT) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id CBCB24B2B3; Thu, 7 Oct 2021 19:35:08 -0400 (EDT) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 8C1044086F for ; Thu, 7 Oct 2021 19:35:07 -0400 (EDT) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 3PiCXm3fQPC7 for ; Thu, 7 Oct 2021 19:35:06 -0400 (EDT) Received: from mail-pg1-f201.google.com (mail-pg1-f201.google.com [209.85.215.201]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id AC4804B1DA for ; Thu, 7 Oct 2021 19:35:03 -0400 (EDT) Received: by mail-pg1-f201.google.com with SMTP id z7-20020a63c047000000b0026b13e40309so566459pgi.19 for ; Thu, 07 Oct 2021 16:35:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=9PSgeQegZjMs5aQbS9f355ca1mIB9gCuDVJX98/wgi4=; b=CUwm009NcsfB4wM2HwUbkEBpfaskzb1HDELJnrL5vLcniu64pkiWZOUAYCZ9j+U8bI EgotwZOdqbR28vF+Nv0332HFuIhlfS41yXvGgqyT2eDqfuLMsU3Dmq05PLYC6/Kwmo0G IbYP1Aev1mmhP77pUr3coXtrRpU4az6/J0qcizA1EeWvzPjDUmC+EZ1Q6OgsL1KNXyAe fVlMzQt39+yoHpu+RYwCqk5FjboaKRY9YlwwbD1TY3aCP7pHaAUzBR2XHA7B7o8v8RyL AUJO6D1xPiR0RCgM6VO43qrccSA7ZNSAkkbyXrm5ub7UDqS071f0tANipuPAaYI4w0yH CtBQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=9PSgeQegZjMs5aQbS9f355ca1mIB9gCuDVJX98/wgi4=; b=5wbLJhDpTaGVnbSzs1kmFI7GLCg48SE/Df9fZ7M9ah6cf6VJ91RdgIqvDZ8lCMrgJu zMyeVxgCWfDCeH5xwgcXGrCOmlzsAf6jyNMs0ZEJ6cOgEvSHhzj5EoFVdc1+nqTolvFW 27EpcKdaPeELc2CAqdaYiMsZkU+V/Y2q0ED0VJitkIFZ7YnCngxvy5WZz5qQH9ArGwjc f/fzkSZhTE3jyb54j4D4H9/YOMY9VZ7ie0syp+tNNmXOrIBIloGtfwAWPyl3BPpBE5/p jZaQ1j5nWswWB2trA/9jMqQLd7q9pVl6Pqn7HB/FE7lkAP/5UVbZu/woeIah987vVlI8 luyA== X-Gm-Message-State: AOAM531NQ12xD4+8KtLc5YmNCYLTzH3UySQieFY8/POzk3pFR6WDd3iS tFCmII/Jox87X6iJjfk4SfdEK8RrDBmd X-Google-Smtp-Source: ABdhPJxhkF+2VPtnNSdk96r8KkKJxaChFzDmys+zm7/iP86cpUiUQc6Wlzq48Ikt+T6nlvuKb1fEWVupdVGv X-Received: from rananta-virt.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:1bcc]) (user=rananta job=sendgmr) by 2002:a17:902:ee93:b0:13e:c846:c902 with SMTP id a19-20020a170902ee9300b0013ec846c902mr6617482pld.88.1633649702684; Thu, 07 Oct 2021 16:35:02 -0700 (PDT) Date: Thu, 7 Oct 2021 23:34:30 +0000 In-Reply-To: <20211007233439.1826892-1-rananta@google.com> Message-Id: <20211007233439.1826892-7-rananta@google.com> Mime-Version: 1.0 References: <20211007233439.1826892-1-rananta@google.com> X-Mailer: git-send-email 2.33.0.882.g93a45727a2-goog Subject: [PATCH v8 06/15] KVM: arm64: selftests: Add basic support for arch_timers From: Raghavendra Rao Ananta To: Paolo Bonzini , Marc Zyngier , Andrew Jones , James Morse , Alexandru Elisei , Suzuki K Poulose Cc: kvm@vger.kernel.org, Catalin Marinas , Peter Shier , linux-kernel@vger.kernel.org, Will Deacon , kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu Add a minimalistic library support to access the virtual timers, that can be used for simple timing functionalities, such as introducing delays in the guest. Signed-off-by: Raghavendra Rao Ananta Reviewed-by: Andrew Jones --- .../kvm/include/aarch64/arch_timer.h | 142 ++++++++++++++++++ 1 file changed, 142 insertions(+) create mode 100644 tools/testing/selftests/kvm/include/aarch64/arch_timer.h diff --git a/tools/testing/selftests/kvm/include/aarch64/arch_timer.h b/tools/testing/selftests/kvm/include/aarch64/arch_timer.h new file mode 100644 index 000000000000..cb7c03de3a21 --- /dev/null +++ b/tools/testing/selftests/kvm/include/aarch64/arch_timer.h @@ -0,0 +1,142 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * ARM Generic Timer specific interface + */ + +#ifndef SELFTEST_KVM_ARCH_TIMER_H +#define SELFTEST_KVM_ARCH_TIMER_H + +#include "processor.h" + +enum arch_timer { + VIRTUAL, + PHYSICAL, +}; + +#define CTL_ENABLE (1 << 0) +#define CTL_IMASK (1 << 1) +#define CTL_ISTATUS (1 << 2) + +#define msec_to_cycles(msec) \ + (timer_get_cntfrq() * (uint64_t)(msec) / 1000) + +#define usec_to_cycles(usec) \ + (timer_get_cntfrq() * (uint64_t)(usec) / 1000000) + +#define cycles_to_usec(cycles) \ + ((uint64_t)(cycles) * 1000000 / timer_get_cntfrq()) + +static inline uint32_t timer_get_cntfrq(void) +{ + return read_sysreg(cntfrq_el0); +} + +static inline uint64_t timer_get_cntct(enum arch_timer timer) +{ + isb(); + + switch (timer) { + case VIRTUAL: + return read_sysreg(cntvct_el0); + case PHYSICAL: + return read_sysreg(cntpct_el0); + default: + GUEST_ASSERT_1(0, timer); + } + + /* We should not reach here */ + return 0; +} + +static inline void timer_set_cval(enum arch_timer timer, uint64_t cval) +{ + switch (timer) { + case VIRTUAL: + write_sysreg(cval, cntv_cval_el0); + break; + case PHYSICAL: + write_sysreg(cval, cntp_cval_el0); + break; + default: + GUEST_ASSERT_1(0, timer); + } + + isb(); +} + +static inline uint64_t timer_get_cval(enum arch_timer timer) +{ + switch (timer) { + case VIRTUAL: + return read_sysreg(cntv_cval_el0); + case PHYSICAL: + return read_sysreg(cntp_cval_el0); + default: + GUEST_ASSERT_1(0, timer); + } + + /* We should not reach here */ + return 0; +} + +static inline void timer_set_tval(enum arch_timer timer, uint32_t tval) +{ + switch (timer) { + case VIRTUAL: + write_sysreg(tval, cntv_tval_el0); + break; + case PHYSICAL: + write_sysreg(tval, cntp_tval_el0); + break; + default: + GUEST_ASSERT_1(0, timer); + } + + isb(); +} + +static inline void timer_set_ctl(enum arch_timer timer, uint32_t ctl) +{ + switch (timer) { + case VIRTUAL: + write_sysreg(ctl, cntv_ctl_el0); + break; + case PHYSICAL: + write_sysreg(ctl, cntp_ctl_el0); + break; + default: + GUEST_ASSERT_1(0, timer); + } + + isb(); +} + +static inline uint32_t timer_get_ctl(enum arch_timer timer) +{ + switch (timer) { + case VIRTUAL: + return read_sysreg(cntv_ctl_el0); + case PHYSICAL: + return read_sysreg(cntp_ctl_el0); + default: + GUEST_ASSERT_1(0, timer); + } + + /* We should not reach here */ + return 0; +} + +static inline void timer_set_next_cval_ms(enum arch_timer timer, uint32_t msec) +{ + uint64_t now_ct = timer_get_cntct(timer); + uint64_t next_ct = now_ct + msec_to_cycles(msec); + + timer_set_cval(timer, next_ct); +} + +static inline void timer_set_next_tval_ms(enum arch_timer timer, uint32_t msec) +{ + timer_set_tval(timer, msec_to_cycles(msec)); +} + +#endif /* SELFTEST_KVM_ARCH_TIMER_H */ -- 2.33.0.882.g93a45727a2-goog _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm