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 X-Spam-Level: X-Spam-Status: No, score=-10.0 required=3.0 tests=INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C2998C2D0CF for ; Tue, 24 Dec 2019 11:41:13 +0000 (UTC) Received: from mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by mail.kernel.org (Postfix) with ESMTP id 868C220706 for ; Tue, 24 Dec 2019 11:41:13 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 868C220706 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvmarm-bounces@lists.cs.columbia.edu Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 3E0434AF21; Tue, 24 Dec 2019 06:41:13 -0500 (EST) 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 tEcogczzpRs5; Tue, 24 Dec 2019 06:41:12 -0500 (EST) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 3B8AC4AF44; Tue, 24 Dec 2019 06:41:12 -0500 (EST) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 781274AF29 for ; Tue, 24 Dec 2019 06:41:11 -0500 (EST) 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 ZaK0xR+uiz-N for ; Tue, 24 Dec 2019 06:41:10 -0500 (EST) Received: from inca-roads.misterjones.org (inca-roads.misterjones.org [213.251.177.50]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id 6F4D14AF22 for ; Tue, 24 Dec 2019 06:41:10 -0500 (EST) Received: from 78.163-31-62.static.virginmediabusiness.co.uk ([62.31.163.78] helo=why.lan) by cheepnis.misterjones.org with esmtpsa (TLSv1.2:DHE-RSA-AES128-GCM-SHA256:128) (Exim 4.80) (envelope-from ) id 1iji5v-000169-JX; Tue, 24 Dec 2019 12:11:20 +0100 From: Marc Zyngier To: kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org Subject: [PATCH v3 12/32] irqchip/gic-v4.1: Add VPE eviction callback Date: Tue, 24 Dec 2019 11:10:35 +0000 Message-Id: <20191224111055.11836-13-maz@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191224111055.11836-1-maz@kernel.org> References: <20191224111055.11836-1-maz@kernel.org> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 62.31.163.78 X-SA-Exim-Rcpt-To: kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org, eric.auger@redhat.com, james.morse@arm.com, julien.thierry.kdev@gmail.com, suzuki.poulose@arm.com, tglx@linutronix.de, jason@lakedaemon.net, lorenzo.pieralisi@arm.com, Andrew.Murray@arm.com, yuzenghui@huawei.com, rrichter@marvell.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on cheepnis.misterjones.org); SAEximRunCond expanded to false Cc: Lorenzo Pieralisi , Jason Cooper , Robert Richter , Thomas Gleixner 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 When descheduling a VPE, special care must be taken to tell the GIC about whether we want to receive a doorbell or not. This is a major improvement on GICv4.0, where the doorbell had to be separately enabled/disabled. Reviewed-by: Zenghui Yu Signed-off-by: Marc Zyngier --- drivers/irqchip/irq-gic-v3-its.c | 53 +++++++++++++++++++++++++------- 1 file changed, 42 insertions(+), 11 deletions(-) diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c index 49850297fe56..a5567d099a3e 100644 --- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -2631,7 +2631,7 @@ static int __init allocate_lpi_tables(void) return 0; } -static u64 its_clear_vpend_valid(void __iomem *vlpi_base) +static u64 its_clear_vpend_valid(void __iomem *vlpi_base, u64 clr, u64 set) { u32 count = 1000000; /* 1s! */ bool clean; @@ -2639,6 +2639,8 @@ static u64 its_clear_vpend_valid(void __iomem *vlpi_base) val = gits_read_vpendbaser(vlpi_base + GICR_VPENDBASER); val &= ~GICR_VPENDBASER_Valid; + val &= ~clr; + val |= set; gits_write_vpendbaser(val, vlpi_base + GICR_VPENDBASER); do { @@ -2651,6 +2653,11 @@ static u64 its_clear_vpend_valid(void __iomem *vlpi_base) } } while (!clean && count); + if (unlikely(val & GICR_VPENDBASER_Dirty)) { + pr_err_ratelimited("ITS virtual pending table not cleaning\n"); + val |= GICR_VPENDBASER_PendingLast; + } + return val; } @@ -2759,7 +2766,7 @@ static void its_cpu_init_lpis(void) * ancient programming gets left in and has possibility of * corrupting memory. */ - val = its_clear_vpend_valid(vlpi_base); + val = its_clear_vpend_valid(vlpi_base, 0, 0); WARN_ON(val & GICR_VPENDBASER_Dirty); } @@ -3439,16 +3446,10 @@ static void its_vpe_deschedule(struct its_vpe *vpe) void __iomem *vlpi_base = gic_data_rdist_vlpi_base(); u64 val; - val = its_clear_vpend_valid(vlpi_base); + val = its_clear_vpend_valid(vlpi_base, 0, 0); - if (unlikely(val & GICR_VPENDBASER_Dirty)) { - pr_err_ratelimited("ITS virtual pending table not cleaning\n"); - vpe->idai = false; - vpe->pending_last = true; - } else { - vpe->idai = !!(val & GICR_VPENDBASER_IDAI); - vpe->pending_last = !!(val & GICR_VPENDBASER_PendingLast); - } + vpe->idai = !!(val & GICR_VPENDBASER_IDAI); + vpe->pending_last = !!(val & GICR_VPENDBASER_PendingLast); } static void its_vpe_invall(struct its_vpe *vpe) @@ -3640,6 +3641,35 @@ static void its_vpe_4_1_schedule(struct its_vpe *vpe, gits_write_vpendbaser(val, vlpi_base + GICR_VPENDBASER); } +static void its_vpe_4_1_deschedule(struct its_vpe *vpe, + struct its_cmd_info *info) +{ + void __iomem *vlpi_base = gic_data_rdist_vlpi_base(); + u64 val; + + if (info->req_db) { + /* + * vPE is going to block: make the vPE non-resident with + * PendingLast clear and DB set. The GIC guarantees that if + * we read-back PendingLast clear, then a doorbell will be + * delivered when an interrupt comes. + */ + val = its_clear_vpend_valid(vlpi_base, + GICR_VPENDBASER_PendingLast, + GICR_VPENDBASER_4_1_DB); + vpe->pending_last = !!(val & GICR_VPENDBASER_PendingLast); + } else { + /* + * We're not blocking, so just make the vPE non-resident + * with PendingLast set, indicating that we'll be back. + */ + val = its_clear_vpend_valid(vlpi_base, + 0, + GICR_VPENDBASER_PendingLast); + vpe->pending_last = true; + } +} + static int its_vpe_4_1_set_vcpu_affinity(struct irq_data *d, void *vcpu_info) { struct its_vpe *vpe = irq_data_get_irq_chip_data(d); @@ -3651,6 +3681,7 @@ static int its_vpe_4_1_set_vcpu_affinity(struct irq_data *d, void *vcpu_info) return 0; case DESCHEDULE_VPE: + its_vpe_4_1_deschedule(vpe, info); return 0; case INVALL_VPE: -- 2.20.1 _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm