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 71302C433FE for ; Tue, 23 Nov 2021 14:11:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237343AbhKWOOb (ORCPT ); Tue, 23 Nov 2021 09:14:31 -0500 Received: from foss.arm.com ([217.140.110.172]:53622 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237868AbhKWOOO (ORCPT ); Tue, 23 Nov 2021 09:14:14 -0500 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 9BAA0147A; Tue, 23 Nov 2021 06:11:06 -0800 (PST) Received: from e121345-lin.cambridge.arm.com (e121345-lin.cambridge.arm.com [10.1.196.40]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 7F3883F66F; Tue, 23 Nov 2021 06:11:05 -0800 (PST) From: Robin Murphy To: joro@8bytes.org, will@kernel.org Cc: iommu@lists.linux-foundation.org, suravee.suthikulpanit@amd.com, baolu.lu@linux.intel.com, willy@infradead.org, linux-kernel@vger.kernel.org, john.garry@huawei.com Subject: [PATCH 7/9] iommu/iova: Consolidate flush queue code Date: Tue, 23 Nov 2021 14:10:42 +0000 Message-Id: <1f93ca4f8124e2dc14f700905a643d63c7c1ff89.1637671820.git.robin.murphy@arm.com> X-Mailer: git-send-email 2.28.0.dirty In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Squash and simplify some of the freeing code, and move the init and free routines down into the rest of the flush queue code to obviate the forward declarations. Signed-off-by: Robin Murphy --- drivers/iommu/iova.c | 132 +++++++++++++++++++------------------------ 1 file changed, 58 insertions(+), 74 deletions(-) diff --git a/drivers/iommu/iova.c b/drivers/iommu/iova.c index a32007c950e5..159acd34501b 100644 --- a/drivers/iommu/iova.c +++ b/drivers/iommu/iova.c @@ -24,8 +24,6 @@ static unsigned long iova_rcache_get(struct iova_domain *iovad, static void init_iova_rcaches(struct iova_domain *iovad); static void free_cpu_cached_iovas(unsigned int cpu, struct iova_domain *iovad); static void free_iova_rcaches(struct iova_domain *iovad); -static void fq_destroy_all_entries(struct iova_domain *iovad); -static void fq_flush_timeout(struct timer_list *t); static int iova_cpuhp_dead(unsigned int cpu, struct hlist_node *node) { @@ -73,61 +71,6 @@ init_iova_domain(struct iova_domain *iovad, unsigned long granule, } EXPORT_SYMBOL_GPL(init_iova_domain); -static bool has_iova_flush_queue(struct iova_domain *iovad) -{ - return !!iovad->fq; -} - -static void free_iova_flush_queue(struct iova_domain *iovad) -{ - if (!has_iova_flush_queue(iovad)) - return; - - if (timer_pending(&iovad->fq_timer)) - del_timer(&iovad->fq_timer); - - fq_destroy_all_entries(iovad); - - free_percpu(iovad->fq); - - iovad->fq = NULL; - iovad->fq_domain = NULL; -} - -int init_iova_flush_queue(struct iova_domain *iovad, struct iommu_domain *fq_domain) -{ - struct iova_fq __percpu *queue; - int i, cpu; - - atomic64_set(&iovad->fq_flush_start_cnt, 0); - atomic64_set(&iovad->fq_flush_finish_cnt, 0); - - queue = alloc_percpu(struct iova_fq); - if (!queue) - return -ENOMEM; - - for_each_possible_cpu(cpu) { - struct iova_fq *fq; - - fq = per_cpu_ptr(queue, cpu); - fq->head = 0; - fq->tail = 0; - - spin_lock_init(&fq->lock); - - for (i = 0; i < IOVA_FQ_SIZE; i++) - INIT_LIST_HEAD(&fq->entries[i].freelist); - } - - iovad->fq_domain = fq_domain; - iovad->fq = queue; - - timer_setup(&iovad->fq_timer, fq_flush_timeout, 0); - atomic_set(&iovad->fq_timer_on, 0); - - return 0; -} - static struct rb_node * __get_cached_rbnode(struct iova_domain *iovad, unsigned long limit_pfn) { @@ -586,23 +529,6 @@ static void iova_domain_flush(struct iova_domain *iovad) atomic64_inc(&iovad->fq_flush_finish_cnt); } -static void fq_destroy_all_entries(struct iova_domain *iovad) -{ - int cpu; - - /* - * This code runs when the iova_domain is being detroyed, so don't - * bother to free iovas, just free any remaining pagetable pages. - */ - for_each_possible_cpu(cpu) { - struct iova_fq *fq = per_cpu_ptr(iovad->fq, cpu); - int idx; - - fq_ring_for_each(idx, fq) - put_pages_list(&fq->entries[idx].freelist); - } -} - static void fq_flush_timeout(struct timer_list *t) { struct iova_domain *iovad = from_timer(iovad, t, fq_timer); @@ -670,6 +596,64 @@ void queue_iova(struct iova_domain *iovad, jiffies + msecs_to_jiffies(IOVA_FQ_TIMEOUT)); } +static void free_iova_flush_queue(struct iova_domain *iovad) +{ + int cpu, idx; + + if (!iovad->fq) + return; + + del_timer(&iovad->fq_timer); + /* + * This code runs when the iova_domain is being detroyed, so don't + * bother to free iovas, just free any remaining pagetable pages. + */ + for_each_possible_cpu(cpu) { + struct iova_fq *fq = per_cpu_ptr(iovad->fq, cpu); + + fq_ring_for_each(idx, fq) + put_pages_list(&fq->entries[idx].freelist); + } + + free_percpu(iovad->fq); + + iovad->fq = NULL; + iovad->fq_domain = NULL; +} + +int init_iova_flush_queue(struct iova_domain *iovad, struct iommu_domain *fq_domain) +{ + struct iova_fq __percpu *queue; + int i, cpu; + + atomic64_set(&iovad->fq_flush_start_cnt, 0); + atomic64_set(&iovad->fq_flush_finish_cnt, 0); + + queue = alloc_percpu(struct iova_fq); + if (!queue) + return -ENOMEM; + + for_each_possible_cpu(cpu) { + struct iova_fq *fq = per_cpu_ptr(queue, cpu); + + fq->head = 0; + fq->tail = 0; + + spin_lock_init(&fq->lock); + + for (i = 0; i < IOVA_FQ_SIZE; i++) + INIT_LIST_HEAD(&fq->entries[i].freelist); + } + + iovad->fq_domain = fq_domain; + iovad->fq = queue; + + timer_setup(&iovad->fq_timer, fq_flush_timeout, 0); + atomic_set(&iovad->fq_timer_on, 0); + + return 0; +} + /** * put_iova_domain - destroys the iova domain * @iovad: - iova domain in question. -- 2.28.0.dirty