From patchwork Fri Jun 17 06:27:00 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marek Szyprowski X-Patchwork-Id: 70281 Delivered-To: patch@linaro.org Received: by 10.140.28.4 with SMTP id 4csp126084qgy; Thu, 16 Jun 2016 23:27:39 -0700 (PDT) X-Received: by 10.98.102.133 with SMTP id s5mr612485pfj.75.1466144858905; Thu, 16 Jun 2016 23:27:38 -0700 (PDT) Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id m87si10638924pfi.190.2016.06.16.23.27.38; Thu, 16 Jun 2016 23:27:38 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932893AbcFQG11 (ORCPT + 30 others); Fri, 17 Jun 2016 02:27:27 -0400 Received: from mailout3.w1.samsung.com ([210.118.77.13]:57146 "EHLO mailout3.w1.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755169AbcFQG1X (ORCPT ); Fri, 17 Jun 2016 02:27:23 -0400 Received: from eucpsbgm2.samsung.com (unknown [203.254.199.245]) by mailout3.w1.samsung.com (Oracle Communications Messaging Server 7.0.5.31.0 64bit (built May 5 2014)) with ESMTP id <0O8W00JQYKLG0390@mailout3.w1.samsung.com>; Fri, 17 Jun 2016 07:27:17 +0100 (BST) X-AuditID: cbfec7f5-f792a6d000001302-34-57639844cf26 Received: from eusync4.samsung.com ( [203.254.199.214]) by eucpsbgm2.samsung.com (EUCPMTA) with SMTP id 43.6F.04866.44893675; Fri, 17 Jun 2016 07:27:16 +0100 (BST) Received: from AMDC2765.digital.local ([106.116.147.25]) by eusync4.samsung.com (Oracle Communications Messaging Server 7.0.5.31.0 64bit (built May 5 2014)) with ESMTPA id <0O8W00HUZKL21910@eusync4.samsung.com>; Fri, 17 Jun 2016 07:27:16 +0100 (BST) From: Marek Szyprowski To: linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, linux-samsung-soc@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: Marek Szyprowski , Joerg Roedel , Inki Dae , Kukjin Kim , Krzysztof Kozlowski , Bartlomiej Zolnierkiewicz , "Rafael J. Wysocki" , Ulf Hansson , Mark Brown , Greg Kroah-Hartman Subject: [PATCH v2 10/10] iommu/exynos: Add proper runtime pm support Date: Fri, 17 Jun 2016 08:27:00 +0200 Message-id: <1466144820-6286-11-git-send-email-m.szyprowski@samsung.com> X-Mailer: git-send-email 1.9.1 In-reply-to: <1466144820-6286-1-git-send-email-m.szyprowski@samsung.com> References: <1466144820-6286-1-git-send-email-m.szyprowski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFjrNLMWRmVeSWpSXmKPExsVy+t/xa7ouM5LDDR4fM7bYOGM9q8XUh0/Y LJoXr2ezmHR/AovFgv3WFp2zN7BbvH5haNH/+DWzxabH11gtLu+aw2bxufcIo8WM8/uYLNYe uctuceb0JVaL42vDHfg9nhycx+SxaVUnm8eda3vYPPbPXcPusXlJvcfkG8sZPbZcbWfx6Nuy itHj8ya5AM4oLpuU1JzMstQifbsEroyPO+6wFlyMqJjYrdbA+MOji5GTQ0LAROLF5c/MELaY xIV769m6GLk4hASWMkos7d3GCJIQEmhikji+LBfEZhMwlOh62wVWJCKwklFi2559zCAOs8BC ZonmNc0sXYwcHMICrhIfHviDNLAIqEp0PFnCDmLzCnhInDp4nRFim5zEyWOTWUFsTqD4i1s/ WCCWuUvsOnyKeQIj7wJGhlWMoqmlyQXFSem5RnrFibnFpXnpesn5uZsYIUH8dQfj0mNWhxgF OBiVeHhXiCaHC7EmlhVX5h5ilOBgVhLhLZkEFOJNSaysSi3Kjy8qzUktPsQozcGiJM47c9f7 ECGB9MSS1OzU1ILUIpgsEwenVAOjuf+U0g/XWc4dzk9cNGPS/fa595Q3T9iz5/m3DPdyv17T XeaJSVfePXjmHbvj45oUkRi/T32CHpKn097vXNtRyhD0xeD/31DecCcjo9DXc5QtyuYqvBNN bP1QFn9Zc7eDpOdBya+ZrwPrM5iZOB0c72T9E1l9/AqbQ9H7Xf5XuqVOLi+XcYhWYinOSDTU Yi4qTgQAxrex5l4CAAA= Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch uses recently introduced device links to track the runtime pm state of the master's device. This way each SYSMMU controller is runtime active its master's device is active and can save/restore its state instead of being enabled all the time. This way SYSMMU controllers no longer prevents respective power domains to be turned off when master's device is not used. Signed-off-by: Marek Szyprowski --- drivers/iommu/exynos-iommu.c | 218 ++++++++++++++++++++----------------------- 1 file changed, 99 insertions(+), 119 deletions(-) -- 1.9.1 diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c index 9d1a14f88891..80b7f1e7268c 100644 --- a/drivers/iommu/exynos-iommu.c +++ b/drivers/iommu/exynos-iommu.c @@ -233,8 +233,8 @@ struct sysmmu_drvdata { struct clk *aclk; /* SYSMMU's aclk clock */ struct clk *pclk; /* SYSMMU's pclk clock */ struct clk *clk_master; /* master's device clock */ - int activations; /* number of calls to sysmmu_enable */ spinlock_t lock; /* lock for modyfying state */ + int active; /* current status */ struct exynos_iommu_domain *domain; /* domain we belong to */ struct list_head domain_node; /* node for domain clients list */ struct list_head owner_node; /* node for owner controllers list */ @@ -247,25 +247,6 @@ static struct exynos_iommu_domain *to_exynos_domain(struct iommu_domain *dom) return container_of(dom, struct exynos_iommu_domain, domain); } -static bool set_sysmmu_active(struct sysmmu_drvdata *data) -{ - /* return true if the System MMU was not active previously - and it needs to be initialized */ - return ++data->activations == 1; -} - -static bool set_sysmmu_inactive(struct sysmmu_drvdata *data) -{ - /* return true if the System MMU is needed to be disabled */ - BUG_ON(data->activations < 1); - return --data->activations == 0; -} - -static bool is_sysmmu_active(struct sysmmu_drvdata *data) -{ - return data->activations > 0; -} - static void sysmmu_unblock(struct sysmmu_drvdata *data) { writel(CTRL_ENABLE, data->sfrbase + REG_MMU_CTRL); @@ -384,7 +365,7 @@ static irqreturn_t exynos_sysmmu_irq(int irq, void *dev_id) unsigned short reg_status, reg_clear; int ret = -ENOSYS; - WARN_ON(!is_sysmmu_active(data)); + WARN_ON(!data->active); if (MMU_MAJ_VER(data->version) < 5) { reg_status = REG_INT_STATUS; @@ -430,7 +411,7 @@ static irqreturn_t exynos_sysmmu_irq(int irq, void *dev_id) return IRQ_HANDLED; } -static void __sysmmu_disable_nocount(struct sysmmu_drvdata *data) +static void __sysmmu_disable(struct sysmmu_drvdata *data) { clk_enable(data->clk_master); @@ -440,32 +421,6 @@ static void __sysmmu_disable_nocount(struct sysmmu_drvdata *data) __sysmmu_disable_clocks(data); } -static bool __sysmmu_disable(struct sysmmu_drvdata *data) -{ - bool disabled; - unsigned long flags; - - spin_lock_irqsave(&data->lock, flags); - - disabled = set_sysmmu_inactive(data); - - if (disabled) { - data->pgtable = 0; - data->domain = NULL; - - __sysmmu_disable_nocount(data); - - dev_dbg(data->sysmmu, "Disabled\n"); - } else { - dev_dbg(data->sysmmu, "%d times left to disable\n", - data->activations); - } - - spin_unlock_irqrestore(&data->lock, flags); - - return disabled; -} - static void __sysmmu_init_config(struct sysmmu_drvdata *data) { unsigned int cfg; @@ -480,7 +435,7 @@ static void __sysmmu_init_config(struct sysmmu_drvdata *data) writel(cfg, data->sfrbase + REG_MMU_CFG); } -static void __sysmmu_enable_nocount(struct sysmmu_drvdata *data) +static void __sysmmu_enable(struct sysmmu_drvdata *data) { __sysmmu_enable_clocks(data); @@ -501,34 +456,6 @@ static void __sysmmu_enable_nocount(struct sysmmu_drvdata *data) clk_disable(data->clk_master); } -static int __sysmmu_enable(struct sysmmu_drvdata *data, phys_addr_t pgtable, - struct exynos_iommu_domain *domain) -{ - int ret = 0; - unsigned long flags; - - spin_lock_irqsave(&data->lock, flags); - if (set_sysmmu_active(data)) { - data->pgtable = pgtable; - data->domain = domain; - - __sysmmu_enable_nocount(data); - - dev_dbg(data->sysmmu, "Enabled\n"); - } else { - ret = (pgtable == data->pgtable) ? 1 : -EBUSY; - - dev_dbg(data->sysmmu, "already enabled\n"); - } - - if (WARN_ON(ret < 0)) - set_sysmmu_inactive(data); /* decrement count */ - - spin_unlock_irqrestore(&data->lock, flags); - - return ret; -} - static void sysmmu_tlb_invalidate_flpdcache(struct sysmmu_drvdata *data, sysmmu_iova_t iova) { @@ -536,7 +463,7 @@ static void sysmmu_tlb_invalidate_flpdcache(struct sysmmu_drvdata *data, spin_lock_irqsave(&data->lock, flags); - if (is_sysmmu_active(data) && data->version >= MAKE_MMU_VER(3, 3)) { + if (data->active && data->version >= MAKE_MMU_VER(3, 3)) { clk_enable(data->clk_master); __sysmmu_tlb_invalidate_entry(data, iova, 1); clk_disable(data->clk_master); @@ -551,7 +478,7 @@ static void sysmmu_tlb_invalidate_entry(struct sysmmu_drvdata *data, unsigned long flags; spin_lock_irqsave(&data->lock, flags); - if (is_sysmmu_active(data)) { + if (data->active) { unsigned int num_inv = 1; clk_enable(data->clk_master); @@ -652,40 +579,78 @@ static int __init exynos_sysmmu_probe(struct platform_device *pdev) } pm_runtime_enable(dev); - of_iommu_set_ops(dev->of_node, &exynos_iommu_ops); return 0; } -#ifdef CONFIG_PM_SLEEP +static int exynos_sysmmu_runtime_suspend(struct device *dev) +{ + struct sysmmu_drvdata *data = dev_get_drvdata(dev); + unsigned long flags; + + spin_lock_irqsave(&data->lock, flags); + if (data->master) { + dev_dbg(data->sysmmu, "runtime pm: saving state\n"); + __sysmmu_disable(data); + data->active = false; + } + spin_unlock_irqrestore(&data->lock, flags); + + return 0; +} + +static int exynos_sysmmu_runtime_resume(struct device *dev) +{ + struct sysmmu_drvdata *data = dev_get_drvdata(dev); + unsigned long flags; + + spin_lock_irqsave(&data->lock, flags); + if (data->master) { + dev_dbg(data->sysmmu, "runtime pm: restoring state\n"); + __sysmmu_enable(data); + data->active = true; + } + spin_unlock_irqrestore(&data->lock, flags); + + return 0; +} + static int exynos_sysmmu_suspend(struct device *dev) { struct sysmmu_drvdata *data = dev_get_drvdata(dev); + unsigned long flags; - dev_dbg(dev, "suspend\n"); - if (is_sysmmu_active(data)) { - __sysmmu_disable_nocount(data); - pm_runtime_put(dev); + spin_lock_irqsave(&data->lock, flags); + if (data->active) { + dev_dbg(data->sysmmu, "saving state\n"); + __sysmmu_disable(data); } + spin_unlock_irqrestore(&data->lock, flags); + return 0; } static int exynos_sysmmu_resume(struct device *dev) { struct sysmmu_drvdata *data = dev_get_drvdata(dev); + unsigned long flags; - dev_dbg(dev, "resume\n"); - if (is_sysmmu_active(data)) { - pm_runtime_get_sync(dev); - __sysmmu_enable_nocount(data); + spin_lock_irqsave(&data->lock, flags); + if (data->active) { + dev_dbg(data->sysmmu, "restoring state\n"); + __sysmmu_enable(data); } + spin_unlock_irqrestore(&data->lock, flags); + return 0; } -#endif static const struct dev_pm_ops sysmmu_pm_ops = { - SET_LATE_SYSTEM_SLEEP_PM_OPS(exynos_sysmmu_suspend, exynos_sysmmu_resume) + SET_RUNTIME_PM_OPS(exynos_sysmmu_runtime_suspend, + exynos_sysmmu_runtime_resume, NULL) + SET_LATE_SYSTEM_SLEEP_PM_OPS(exynos_sysmmu_suspend, + exynos_sysmmu_resume) }; static const struct of_device_id sysmmu_of_match[] __initconst = { @@ -789,9 +754,16 @@ static void exynos_iommu_domain_free(struct iommu_domain *iommu_domain) spin_lock_irqsave(&domain->lock, flags); list_for_each_entry_safe(data, next, &domain->clients, domain_node) { - if (__sysmmu_disable(data)) - data->master = NULL; + spin_lock(&data->lock); + if (WARN_ON(data->active)) { + __sysmmu_disable(data); + data->active = false; + } + data->master = NULL; + data->pgtable = 0; + data->domain = NULL; list_del_init(&data->domain_node); + spin_unlock(&data->lock); } spin_unlock_irqrestore(&domain->lock, flags); @@ -832,18 +804,22 @@ static void exynos_iommu_detach_device(struct iommu_domain *iommu_domain, spin_lock_irqsave(&domain->lock, flags); list_for_each_entry_safe(data, next, &domain->clients, domain_node) { + spin_lock(&data->lock); if (data->master == dev) { - if (__sysmmu_disable(data)) { - data->master = NULL; - list_del_init(&data->domain_node); - } - pm_runtime_put(data->sysmmu); found = true; + if (data->active) { + __sysmmu_disable(data); + data->active = false; + } + data->master = NULL; + data->pgtable = 0; + data->domain = NULL; + list_del_init(&data->domain_node); } + spin_unlock(&data->lock); } - spin_unlock_irqrestore(&domain->lock, flags); - owner->domain = NULL; + spin_unlock_irqrestore(&domain->lock, flags); if (found) dev_dbg(dev, "%s: Detached IOMMU with pgtable %pa\n", @@ -860,7 +836,6 @@ static int exynos_iommu_attach_device(struct iommu_domain *iommu_domain, struct sysmmu_drvdata *data; phys_addr_t pagetable = virt_to_phys(domain->pgtable); unsigned long flags; - int ret = -ENODEV; if (!has_sysmmu(dev)) return -ENODEV; @@ -868,29 +843,26 @@ static int exynos_iommu_attach_device(struct iommu_domain *iommu_domain, if (owner->domain) exynos_iommu_detach_device(owner->domain, dev); + spin_lock_irqsave(&domain->lock, flags); list_for_each_entry(data, &owner->controllers, owner_node) { - pm_runtime_get_sync(data->sysmmu); - ret = __sysmmu_enable(data, pagetable, domain); - if (ret >= 0) { - data->master = dev; - - spin_lock_irqsave(&domain->lock, flags); - list_add_tail(&data->domain_node, &domain->clients); - spin_unlock_irqrestore(&domain->lock, flags); + spin_lock(&data->lock); + data->master = dev; + data->pgtable = pagetable; + data->domain = domain; + list_add_tail(&data->domain_node, &domain->clients); + if (pm_runtime_active(data->sysmmu)) { + __sysmmu_enable(data); + data->active = true; } + spin_unlock(&data->lock); } - - if (ret < 0) { - dev_err(dev, "%s: Failed to attach IOMMU with pgtable %pa\n", - __func__, &pagetable); - return ret; - } - owner->domain = iommu_domain; - dev_dbg(dev, "%s: Attached IOMMU with pgtable %pa %s\n", - __func__, &pagetable, (ret == 0) ? "" : ", again"); + spin_unlock_irqrestore(&domain->lock, flags); - return ret; + dev_dbg(dev, "%s: Attached IOMMU with pgtable %pa\n", + __func__, &pagetable); + + return 0; } static sysmmu_pte_t *alloc_lv2entry(struct exynos_iommu_domain *domain, @@ -1265,6 +1237,14 @@ static int exynos_iommu_of_xlate(struct device *dev, } list_add_tail(&data->owner_node, &owner->controllers); + + /* + * SYSMMU will be runtime enabled via device link (dependency) to its + * master device, so there are no direct calls to pm_runtime_get/put + * in this driver + */ + device_link_add(dev, &sysmmu->dev, DEVICE_LINK_PERSISTENT | + DEVICE_LINK_PM_RUNTIME); return 0; }