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=-6.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 C66F7C169C4 for ; Tue, 29 Jan 2019 11:46:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 95BD62083B for ; Tue, 29 Jan 2019 11:46:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1548762361; bh=Opb5ZpCHndRBsKyFFy/HY5GsN4PkQgjxnFaW7XFRVTI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=cC88l7SSfld9MXBGG1Enwih06vZ0dob9cIh9tnlkyS4WRv7aCkk9j4c/Yod8hGaSL gQ6PV02sbaWMxpiYn4ublMt9Fu9aUeJ5jhdqAGCYRfutIJ1qwdwiKzV+6MBL4EsPhy /xwnKSUWUnkAb3gtTprAfPteYB9UixD3OBoKVc18= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730092AbfA2LqA (ORCPT ); Tue, 29 Jan 2019 06:46:00 -0500 Received: from mail.kernel.org ([198.145.29.99]:36384 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730865AbfA2Lpx (ORCPT ); Tue, 29 Jan 2019 06:45:53 -0500 Received: from localhost (5356596B.cm-6-7b.dynamic.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id F34B22086C; Tue, 29 Jan 2019 11:45:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1548762352; bh=Opb5ZpCHndRBsKyFFy/HY5GsN4PkQgjxnFaW7XFRVTI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=EUo78p/vfQEEiBokiQi4zDXrLdKQ3y8U+JRcITAprnWJHklN9bGPG3FMbUywCP55G D93DmuLmqka8ls0IPqHpqKW9Lbyy4VpyIO4K+tTS+znTFIW7lPwHsWx/voTQCqVzWR 0+dGJtY5F4G5CNZo7DKGZBhBIqnxKzIrb/61djx0= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Ard Biesheuvel , Marc Zyngier Subject: [PATCH 4.19 078/103] irqchip/gic-v3-its: Align PCI Multi-MSI allocation on their size Date: Tue, 29 Jan 2019 12:35:55 +0100 Message-Id: <20190129113205.756415368@linuxfoundation.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190129113159.567154026@linuxfoundation.org> References: <20190129113159.567154026@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: Marc Zyngier commit 8208d1708b88b412ca97f50a6d951242c88cbbac upstream. The way we allocate events works fine in most cases, except when multiple PCI devices share an ITS-visible DevID, and that one of them is trying to use MultiMSI allocation. In that case, our allocation is not guaranteed to be zero-based anymore, and we have to make sure we allocate it on a boundary that is compatible with the PCI Multi-MSI constraints. Fix this by allocating the full region upfront instead of iterating over the number of MSIs. MSI-X are always allocated one by one, so this shouldn't change anything on that front. Fixes: b48ac83d6bbc2 ("irqchip: GICv3: ITS: MSI support") Cc: stable@vger.kernel.org Reported-by: Ard Biesheuvel Tested-by: Ard Biesheuvel Signed-off-by: Marc Zyngier Signed-off-by: Greg Kroah-Hartman --- drivers/irqchip/irq-gic-v3-its.c | 25 +++++++++++++------------ 1 file changed, 13 insertions(+), 12 deletions(-) --- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -2267,13 +2267,14 @@ static void its_free_device(struct its_d kfree(its_dev); } -static int its_alloc_device_irq(struct its_device *dev, irq_hw_number_t *hwirq) +static int its_alloc_device_irq(struct its_device *dev, int nvecs, irq_hw_number_t *hwirq) { int idx; - idx = find_first_zero_bit(dev->event_map.lpi_map, - dev->event_map.nr_lpis); - if (idx == dev->event_map.nr_lpis) + idx = bitmap_find_free_region(dev->event_map.lpi_map, + dev->event_map.nr_lpis, + get_count_order(nvecs)); + if (idx < 0) return -ENOSPC; *hwirq = dev->event_map.lpi_base + idx; @@ -2369,21 +2370,21 @@ static int its_irq_domain_alloc(struct i int err; int i; - for (i = 0; i < nr_irqs; i++) { - err = its_alloc_device_irq(its_dev, &hwirq); - if (err) - return err; + err = its_alloc_device_irq(its_dev, nr_irqs, &hwirq); + if (err) + return err; - err = its_irq_gic_domain_alloc(domain, virq + i, hwirq); + for (i = 0; i < nr_irqs; i++) { + err = its_irq_gic_domain_alloc(domain, virq + i, hwirq + i); if (err) return err; irq_domain_set_hwirq_and_chip(domain, virq + i, - hwirq, &its_irq_chip, its_dev); + hwirq + i, &its_irq_chip, its_dev); irqd_set_single_target(irq_desc_get_irq_data(irq_to_desc(virq + i))); pr_debug("ID:%d pID:%d vID:%d\n", - (int)(hwirq - its_dev->event_map.lpi_base), - (int) hwirq, virq + i); + (int)(hwirq + i - its_dev->event_map.lpi_base), + (int)(hwirq + i), virq + i); } return 0;