From nobody Tue Dec 23 16:19:30 2025 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 66F813B18D for ; Mon, 5 Feb 2024 15:32:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707147171; cv=none; b=TBSw+UYmpDo9qTAe3ZmoTSCA5ysPNNH5HtnUAVT8hALpj6P+WpydEQv/QCyCJdOklNk3gRnl2BPQPmZJTx4s/i0314B3B1q5vqOqMyrIZ2QcdEwc34Kl2kNnqK1rt8qZ+6br2V0E59EeAImM3Q+feVuSi8CkX1+BJHRrPN7EhoY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707147171; c=relaxed/simple; bh=r1hkzYJmSuuIn0H8ddW+ei/JSVISOgRUUYc6h1WMsCA=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=Iasucun0u9DQNhGSiSncUAe76rYj+gju9hNoezNLNcXmE5i69DqAavWTmMOePaI2azUH0mAeW/ysOqx6nogVsk+WW9/+hcyAZUT9Qn5+I5KFk0oAj4N/P35/1t7xq4nrLQmNF7x84pL+Pwrj9ydbG/jKKBf2tpZ5yTYMDLDLOGc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com 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 9287C12FC; Mon, 5 Feb 2024 07:33:31 -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 C60753F5A1; Mon, 5 Feb 2024 07:32:47 -0800 (PST) From: Robin Murphy To: joro@8bytes.org Cc: will@kernel.org, pasha.tatashin@soleen.com, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org, rientjes@google.com, yosryahmed@google.com, john.g.garry@oracle.com Subject: [PATCH v3 2/3] iommu/iova: Reorganise some code Date: Mon, 5 Feb 2024 15:32:40 +0000 Message-Id: X-Mailer: git-send-email 2.39.2.101.g768bb238c484.dirty In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The iova_cache_{get,put}() calls really represent top-level lifecycle management for the whole IOVA library, so it's long been rather confusing to have them buried right in the middle of the allocator implementation details. Move them to a more expected position at the end of the file, where it will then also be easier to expand them. With this, we can also move the rcache hotplug handler (plus another stray function) into the rcache portion of the file. Signed-off-by: Robin Murphy Acked-by: David Rientjes Reviewed-by: Jerry Snitselaar Reviewed-by: John Garry Reviewed-by: Pasha Tatashin --- drivers/iommu/iova.c | 128 +++++++++++++++++++++---------------------- 1 file changed, 64 insertions(+), 64 deletions(-) diff --git a/drivers/iommu/iova.c b/drivers/iommu/iova.c index cf95001d85c0..b5de865ee50b 100644 --- a/drivers/iommu/iova.c +++ b/drivers/iommu/iova.c @@ -24,24 +24,8 @@ static bool iova_rcache_insert(struct iova_domain *iovad, static unsigned long iova_rcache_get(struct iova_domain *iovad, unsigned long size, unsigned long limit_pfn); -static void free_cpu_cached_iovas(unsigned int cpu, struct iova_domain *io= vad); static void free_iova_rcaches(struct iova_domain *iovad); - -unsigned long iova_rcache_range(void) -{ - return PAGE_SIZE << (IOVA_RANGE_CACHE_MAX_SIZE - 1); -} - -static int iova_cpuhp_dead(unsigned int cpu, struct hlist_node *node) -{ - struct iova_domain *iovad; - - iovad =3D hlist_entry_safe(node, struct iova_domain, cpuhp_dead); - - free_cpu_cached_iovas(cpu, iovad); - return 0; -} - +static void free_cpu_cached_iovas(unsigned int cpu, struct iova_domain *io= vad); static void free_global_cached_iovas(struct iova_domain *iovad); =20 static struct iova *to_iova(struct rb_node *node) @@ -252,53 +236,6 @@ static void free_iova_mem(struct iova *iova) kmem_cache_free(iova_cache, iova); } =20 -int iova_cache_get(void) -{ - int err =3D -ENOMEM; - - mutex_lock(&iova_cache_mutex); - if (!iova_cache_users) { - iova_cache =3D kmem_cache_create("iommu_iova", sizeof(struct iova), 0, - SLAB_HWCACHE_ALIGN, NULL); - if (!iova_cache) - goto out_err; - - err =3D cpuhp_setup_state_multi(CPUHP_IOMMU_IOVA_DEAD, "iommu/iova:dead", - NULL, iova_cpuhp_dead); - if (err) { - pr_err("IOVA: Couldn't register cpuhp handler: %pe\n", ERR_PTR(err)); - goto out_err; - } - } - - iova_cache_users++; - mutex_unlock(&iova_cache_mutex); - - return 0; - -out_err: - kmem_cache_destroy(iova_cache); - mutex_unlock(&iova_cache_mutex); - return err; -} -EXPORT_SYMBOL_GPL(iova_cache_get); - -void iova_cache_put(void) -{ - mutex_lock(&iova_cache_mutex); - if (WARN_ON(!iova_cache_users)) { - mutex_unlock(&iova_cache_mutex); - return; - } - iova_cache_users--; - if (!iova_cache_users) { - cpuhp_remove_multi_state(CPUHP_IOMMU_IOVA_DEAD); - kmem_cache_destroy(iova_cache); - } - mutex_unlock(&iova_cache_mutex); -} -EXPORT_SYMBOL_GPL(iova_cache_put); - /** * alloc_iova - allocates an iova * @iovad: - iova domain in question @@ -653,6 +590,11 @@ struct iova_rcache { struct delayed_work work; }; =20 +unsigned long iova_rcache_range(void) +{ + return PAGE_SIZE << (IOVA_RANGE_CACHE_MAX_SIZE - 1); +} + static struct iova_magazine *iova_magazine_alloc(gfp_t flags) { struct iova_magazine *mag; @@ -989,5 +931,63 @@ static void free_global_cached_iovas(struct iova_domai= n *iovad) spin_unlock_irqrestore(&rcache->lock, flags); } } + +static int iova_cpuhp_dead(unsigned int cpu, struct hlist_node *node) +{ + struct iova_domain *iovad; + + iovad =3D hlist_entry_safe(node, struct iova_domain, cpuhp_dead); + + free_cpu_cached_iovas(cpu, iovad); + return 0; +} + +int iova_cache_get(void) +{ + int err =3D -ENOMEM; + + mutex_lock(&iova_cache_mutex); + if (!iova_cache_users) { + iova_cache =3D kmem_cache_create("iommu_iova", sizeof(struct iova), 0, + SLAB_HWCACHE_ALIGN, NULL); + if (!iova_cache) + goto out_err; + + err =3D cpuhp_setup_state_multi(CPUHP_IOMMU_IOVA_DEAD, "iommu/iova:dead", + NULL, iova_cpuhp_dead); + if (err) { + pr_err("IOVA: Couldn't register cpuhp handler: %pe\n", ERR_PTR(err)); + goto out_err; + } + } + + iova_cache_users++; + mutex_unlock(&iova_cache_mutex); + + return 0; + +out_err: + kmem_cache_destroy(iova_cache); + mutex_unlock(&iova_cache_mutex); + return err; +} +EXPORT_SYMBOL_GPL(iova_cache_get); + +void iova_cache_put(void) +{ + mutex_lock(&iova_cache_mutex); + if (WARN_ON(!iova_cache_users)) { + mutex_unlock(&iova_cache_mutex); + return; + } + iova_cache_users--; + if (!iova_cache_users) { + cpuhp_remove_multi_state(CPUHP_IOMMU_IOVA_DEAD); + kmem_cache_destroy(iova_cache); + } + mutex_unlock(&iova_cache_mutex); +} +EXPORT_SYMBOL_GPL(iova_cache_put); + MODULE_AUTHOR("Anil S Keshavamurthy "); MODULE_LICENSE("GPL"); --=20 2.39.2.101.g768bb238c484.dirty