Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752065AbcKIHtc (ORCPT ); Wed, 9 Nov 2016 02:49:32 -0500 Received: from terminus.zytor.com ([198.137.202.10]:38368 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751095AbcKIHta (ORCPT ); Wed, 9 Nov 2016 02:49:30 -0500 Date: Tue, 8 Nov 2016 23:49:18 -0800 From: tip-bot for Christoph Hellwig Message-ID: Cc: linux-kernel@vger.kernel.org, axboe@kernel.dk, hpa@zytor.com, hch@lst.de, hare@suse.com, tglx@linutronix.de, mingo@kernel.org Reply-To: hpa@zytor.com, tglx@linutronix.de, mingo@kernel.org, hare@suse.com, hch@lst.de, linux-kernel@vger.kernel.org, axboe@kernel.dk In-Reply-To: <1478654107-7384-3-git-send-email-hch@lst.de> References: <1478654107-7384-3-git-send-email-hch@lst.de> To: linux-tip-commits@vger.kernel.org Subject: [tip:irq/core] genirq/affinity: Handle pre/post vectors in irq_calc_affinity_vectors() Git-Commit-ID: 212bd846223c718b6577d4df16fd8d05a55ad914 X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4501 Lines: 130 Commit-ID: 212bd846223c718b6577d4df16fd8d05a55ad914 Gitweb: http://git.kernel.org/tip/212bd846223c718b6577d4df16fd8d05a55ad914 Author: Christoph Hellwig AuthorDate: Tue, 8 Nov 2016 17:15:02 -0800 Committer: Thomas Gleixner CommitDate: Wed, 9 Nov 2016 08:25:08 +0100 genirq/affinity: Handle pre/post vectors in irq_calc_affinity_vectors() Only calculate the affinity for the main I/O vectors, and skip the pre or post vectors specified by struct irq_affinity. Also remove the irq_affinity cpumask argument that has never been used. If we ever need it in the future we can pass it through struct irq_affinity. Signed-off-by: Christoph Hellwig Reviewed-by: Hannes Reinecke Acked-by: Jens Axboe Cc: linux-block@vger.kernel.org Cc: linux-pci@vger.kernel.org Link: http://lkml.kernel.org/r/1478654107-7384-3-git-send-email-hch@lst.de Signed-off-by: Thomas Gleixner --- drivers/pci/msi.c | 8 ++++---- include/linux/interrupt.h | 4 ++-- kernel/irq/affinity.c | 24 ++++++++++-------------- 3 files changed, 16 insertions(+), 20 deletions(-) diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c index ad70507..dad2da7 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -1061,6 +1061,7 @@ EXPORT_SYMBOL(pci_msi_enabled); static int __pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec, unsigned int flags) { + static const struct irq_affinity default_affd; bool affinity = flags & PCI_IRQ_AFFINITY; int nvec; int rc; @@ -1091,8 +1092,7 @@ static int __pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec, for (;;) { if (affinity) { - nvec = irq_calc_affinity_vectors(dev->irq_affinity, - nvec); + nvec = irq_calc_affinity_vectors(nvec, &default_affd); if (nvec < minvec) return -ENOSPC; } @@ -1132,6 +1132,7 @@ static int __pci_enable_msix_range(struct pci_dev *dev, struct msix_entry *entries, int minvec, int maxvec, unsigned int flags) { + static const struct irq_affinity default_affd; bool affinity = flags & PCI_IRQ_AFFINITY; int rc, nvec = maxvec; @@ -1140,8 +1141,7 @@ static int __pci_enable_msix_range(struct pci_dev *dev, for (;;) { if (affinity) { - nvec = irq_calc_affinity_vectors(dev->irq_affinity, - nvec); + nvec = irq_calc_affinity_vectors(nvec, &default_affd); if (nvec < minvec) return -ENOSPC; } diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h index 6b52686..9081f23 100644 --- a/include/linux/interrupt.h +++ b/include/linux/interrupt.h @@ -291,7 +291,7 @@ extern int irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify); struct cpumask *irq_create_affinity_masks(const struct cpumask *affinity, int nvec); -int irq_calc_affinity_vectors(const struct cpumask *affinity, int maxvec); +int irq_calc_affinity_vectors(int maxvec, const struct irq_affinity *affd); #else /* CONFIG_SMP */ @@ -331,7 +331,7 @@ irq_create_affinity_masks(const struct cpumask *affinity, int nvec) } static inline int -irq_calc_affinity_vectors(const struct cpumask *affinity, int maxvec) +irq_calc_affinity_vectors(int maxvec, const struct irq_affinity *affd) { return maxvec; } diff --git a/kernel/irq/affinity.c b/kernel/irq/affinity.c index 17f51d63..8d92597 100644 --- a/kernel/irq/affinity.c +++ b/kernel/irq/affinity.c @@ -131,24 +131,20 @@ out: } /** - * irq_calc_affinity_vectors - Calculate to optimal number of vectors for a given affinity mask - * @affinity: The affinity mask to spread. If NULL cpu_online_mask - * is used - * @maxvec: The maximum number of vectors available + * irq_calc_affinity_vectors - Calculate the optimal number of vectors + * @maxvec: The maximum number of vectors available + * @affd: Description of the affinity requirements */ -int irq_calc_affinity_vectors(const struct cpumask *affinity, int maxvec) +int irq_calc_affinity_vectors(int maxvec, const struct irq_affinity *affd) { - int cpus, ret; + int resv = affd->pre_vectors + affd->post_vectors; + int vecs = maxvec - resv; + int cpus; /* Stabilize the cpumasks */ get_online_cpus(); - /* If the supplied affinity mask is NULL, use cpu online mask */ - if (!affinity) - affinity = cpu_online_mask; - - cpus = cpumask_weight(affinity); - ret = (cpus < maxvec) ? cpus : maxvec; - + cpus = cpumask_weight(cpu_online_mask); put_online_cpus(); - return ret; + + return min(cpus, vecs) + resv; }