From patchwork Mon Feb 13 18:02:31 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Raghavendra Rao Ananta X-Patchwork-Id: 13138767 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 774B2C636D4 for ; Mon, 13 Feb 2023 18:03:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230521AbjBMSDV (ORCPT ); Mon, 13 Feb 2023 13:03:21 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47956 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230509AbjBMSDI (ORCPT ); Mon, 13 Feb 2023 13:03:08 -0500 Received: from mail-yb1-xb4a.google.com (mail-yb1-xb4a.google.com [IPv6:2607:f8b0:4864:20::b4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 87EA79032 for ; Mon, 13 Feb 2023 10:02:51 -0800 (PST) Received: by mail-yb1-xb4a.google.com with SMTP id a17-20020a256611000000b00889c54916f2so13279447ybc.14 for ; Mon, 13 Feb 2023 10:02:51 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=cRn8pqb+ZATFzovvOq02T9w/U2XDHj1IusmF+T0soEI=; b=Odev8Z6Kqs3GEhehIpX1NfnNvtpHcHO5P823Sx9vCSEvBaW+zpJ3MeA2k0DrQgW/hq qzZ0Hg7nt5uxsTCap5L4HuaZBZQTI3E1Zi5MUcXkCuJGIpYie9eqKdEIoyCQHFLzDhhG xlq5vIQJd3CcnFweyuBak5BSdKhSKWTI0i0kyNFGzwKtEuzFKbtmWbuUQceIbBCCHYyi kxFKKFTLFjxiMhp6TugfvW8TYUKvke2doRbaM8GV/h9rrqEyRRaZMrWlf3IqbBqhJGsH wTSTc75k7otoY5g1eF6K6WOJDyw2YWSdz0xPc0gMpyTcUXxLWhaGv9Wjfw3hc+h3rdFW vu0Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=cRn8pqb+ZATFzovvOq02T9w/U2XDHj1IusmF+T0soEI=; b=LoZyP8AiESySt5/fd1nNl5y4yz75XgPgR3dlmroA+euIqy1/4CQahnJtlcgi+fG/pV oaoC+GNE4MIS6SmKXphOi4JHXNaLrYyvyoJT69t16r6hWGTRNc4bn6k/Ng4bgDAGfrKH Bd1g51K25Q8jM7p34KMLpXNaCo/9fLO/9rMcjwMtdlOEGo6BwMc2TCK3WEjv3bP8kedo uCu5P1lG0ZSApa7R1YN24qFl8+9iYz5g55JmAepH2YO3/2Gwz89MPF4CkTe0x2VPxyBs GGhMTAStjVLQrFSjmkM26psUKLhCB7ReLGPysadpR4NUAqs996RfRsK+qdL3R27z4CCv YN4g== X-Gm-Message-State: AO0yUKX6a8k3W44d1j7PcpY8rpyczKe6a6j8frRCb1nsP6aAx47Nhvca j7a2ZKG/+JhYxjeQR9HeD7+UA6wAlpDV X-Google-Smtp-Source: AK7set8RHgzHP8c22NX4XX8rTz8mK48f2xqsC6kI1cPrwBMOEbu/WcXWtj02YO8LfVZHw/DkvQKxZKKZMH8A X-Received: from rananta-linux.c.googlers.com ([fda3:e722:ac3:cc00:2b:ff92:c0a8:22b5]) (user=rananta job=sendgmr) by 2002:a05:690c:788:b0:52f:184a:da09 with SMTP id bw8-20020a05690c078800b0052f184ada09mr23ywb.2.1676311370417; Mon, 13 Feb 2023 10:02:50 -0800 (PST) Date: Mon, 13 Feb 2023 18:02:31 +0000 In-Reply-To: <20230213180234.2885032-1-rananta@google.com> Mime-Version: 1.0 References: <20230213180234.2885032-1-rananta@google.com> X-Mailer: git-send-email 2.39.1.581.gbfd45094c4-goog Message-ID: <20230213180234.2885032-11-rananta@google.com> Subject: [PATCH 10/13] selftests: KVM: aarch64: Test chained events for PMU From: Raghavendra Rao Ananta To: Oliver Upton , Reiji Watanabe , Marc Zyngier , Ricardo Koller , James Morse , Suzuki K Poulose Cc: Paolo Bonzini , Jing Zhang , Colton Lewis , Raghavendra Rao Anata , linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org, kvm@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Extend the vPMU's vCPU migration test to validate chained events, and their overflow conditions. Signed-off-by: Raghavendra Rao Ananta --- .../testing/selftests/kvm/aarch64/vpmu_test.c | 76 ++++++++++++++++++- 1 file changed, 75 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/kvm/aarch64/vpmu_test.c b/tools/testing/selftests/kvm/aarch64/vpmu_test.c index 066dc17fa3906..de725f4339ad5 100644 --- a/tools/testing/selftests/kvm/aarch64/vpmu_test.c +++ b/tools/testing/selftests/kvm/aarch64/vpmu_test.c @@ -23,7 +23,7 @@ * migrating the guest vCPU to random pCPUs in the system, and check * if the vPMU is still behaving as expected. The sub-tests include * testing basic functionalities such as basic counters behavior, - * overflow, and overflow interrupts. + * overflow, overflow interrupts, and chained events. * * Copyright (c) 2022 Google LLC. * @@ -61,6 +61,8 @@ #define PRE_OVERFLOW_32 (GENMASK(31, 0) - COUNT_TO_OVERFLOW + 1) #define PRE_OVERFLOW_64 (GENMASK(63, 0) - COUNT_TO_OVERFLOW + 1) +#define ALL_SET_64 GENMASK(63, 0) + #define GICD_BASE_GPA 0x8000000ULL #define GICR_BASE_GPA 0x80A0000ULL @@ -639,6 +641,75 @@ static void test_cycles_count(bool expect_count, bool test_overflow) pmu_disable_reset(); } +static void test_chained_count(int pmc_idx) +{ + int i, chained_pmc_idx; + struct pmc_accessor *acc; + uint64_t pmcr_n, cnt, cntr_val; + + /* The test needs at least two PMCs */ + pmcr_n = get_pmcr_n(); + GUEST_ASSERT_1(pmcr_n >= 2, pmcr_n); + + /* + * The chained counter's idx is always chained with (pmc_idx + 1). + * pmc_idx should be even as the chained event doesn't count on + * odd numbered counters. + */ + GUEST_ASSERT_1(pmc_idx % 2 == 0, pmc_idx); + + /* + * The max counter idx that the chained counter can occupy is + * (pmcr_n - 1), while the actual event sits on (pmcr_n - 2). + */ + chained_pmc_idx = pmc_idx + 1; + GUEST_ASSERT(chained_pmc_idx < pmcr_n); + + enable_counter(chained_pmc_idx); + pmu_irq_init(chained_pmc_idx); + + /* Configure the chained event using all the possible ways*/ + for (i = 0; i < ARRAY_SIZE(pmc_accessors); i++) { + acc = &pmc_accessors[i]; + + /* Test if the chained counter increments when the base event overflows */ + + cntr_val = 1; + acc->write_cntr(chained_pmc_idx, cntr_val); + acc->write_typer(chained_pmc_idx, ARMV8_PMUV3_PERFCTR_CHAIN); + + /* Chain the counter with pmc_idx that's configured for an overflow */ + test_instructions_count(pmc_idx, true, true); + + /* + * pmc_idx is also configured to run for all the ARRAY_SIZE(pmc_accessors) + * combinations. Hence, the chained chained_pmc_idx is expected to be + * cntr_val + ARRAY_SIZE(pmc_accessors). + */ + cnt = acc->read_cntr(chained_pmc_idx); + GUEST_ASSERT_4(cnt == cntr_val + ARRAY_SIZE(pmc_accessors), + pmc_idx, i, cnt, cntr_val + ARRAY_SIZE(pmc_accessors)); + + /* Test for the overflow of the chained counter itself */ + + cntr_val = ALL_SET_64; + acc->write_cntr(chained_pmc_idx, cntr_val); + + test_instructions_count(pmc_idx, true, true); + + /* + * At this point, an interrupt should've been fired for the chained + * counter (which validates the overflow bit), and the counter should've + * wrapped around to ARRAY_SIZE(pmc_accessors) - 1. + */ + cnt = acc->read_cntr(chained_pmc_idx); + GUEST_ASSERT_4(cnt == ARRAY_SIZE(pmc_accessors) - 1, + pmc_idx, i, cnt, ARRAY_SIZE(pmc_accessors)); + } + + pmu_irq_exit(chained_pmc_idx); +} + static void test_event_count(uint64_t event, int pmc_idx, bool expect_count) { switch (event) { @@ -665,6 +736,9 @@ static void test_basic_pmu_functionality(void) /* Test overflow with interrupts on generic and cycle counters */ test_instructions_count(0, true, true); test_cycles_count(true, true); + + /* Test chained events */ + test_chained_count(0); } /*