linux-kernel - [PATCH 22/29] iommu: exynos: add support for binding more than one sysmmu to master device

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Date:	Tue, 05 Aug 2014 12:47:50 +0200
From:	Marek Szyprowski <m.szyprowski@...sung.com>
To:	iommu@...ts.linux-foundation.org,
	linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:	Marek Szyprowski <m.szyprowski@...sung.com>,
	linaro-mm-sig@...ts.linaro.org, Arnd Bergmann <arnd@...db.de>,
	Shaik Ameer Basha <shaik.ameer@...sung.com>,
	Cho KyongHo <pullip.cho@...sung.com>,
	Joerg Roedel <joro@...tes.org>,
	Thierry Reding <treding@...dia.com>,
	Olof Johansson <olof@...om.net>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Rob Herring <robh@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Inki Dae <inki.dae@...sung.com>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	Tomasz Figa <tomasz.figa@...il.com>,
	Kyungmin Park <kyungmin.park@...sung.com>
Subject: [PATCH 22/29] iommu: exynos: add support for binding more than one
 sysmmu to master device

This patch adds support for assigning more than one SYSMMU controller to
the master device. This has been achieved simply by chaning the struct
device pointer in struct exynos_iommu_owner into the list of struct
sysmmu_drvdata of all controllers assigned to the given master device.

Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
---
 drivers/iommu/exynos-iommu.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index 674d1fb..46e0edc 100644
--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -187,7 +187,7 @@ static char *sysmmu_fault_name[SYSMMU_FAULTS_NUM] = {
 
 /* attached to dev.archdata.iommu of the master device */
 struct exynos_iommu_owner {
-	struct device *sysmmu;
+	struct list_head clients;
 };
 
 struct exynos_iommu_domain {
@@ -208,6 +208,7 @@ struct sysmmu_drvdata {
 	spinlock_t lock;
 	struct iommu_domain *domain;
 	struct list_head domain_node;
+	struct list_head owner_node;
 	phys_addr_t pgtable;
 	int version;
 };
@@ -695,8 +696,7 @@ static int exynos_iommu_attach_device(struct iommu_domain *domain,
 	if (!has_sysmmu(dev))
 		return -ENODEV;
 
-	data = dev_get_drvdata(owner->sysmmu);
-	if (data) {
+	list_for_each_entry(data, &owner->clients, owner_node) {
 		ret = __sysmmu_enable(data, pagetable, domain);
 		if (ret >= 0) {
 			data->master = dev;
@@ -724,7 +724,7 @@ static void exynos_iommu_detach_device(struct iommu_domain *domain,
 {
 	struct exynos_iommu_domain *priv = domain->priv;
 	phys_addr_t pagetable = virt_to_phys(priv->pgtable);
-	struct sysmmu_drvdata *data;
+	struct sysmmu_drvdata *data, *next;
 	unsigned long flags;
 	int found = 0;
 
@@ -732,14 +732,13 @@ static void exynos_iommu_detach_device(struct iommu_domain *domain,
 		return;
 
 	spin_lock_irqsave(&priv->lock, flags);
-	list_for_each_entry(data, &priv->clients, domain_node) {
+	list_for_each_entry_safe(data, next, &priv->clients, domain_node) {
 		if (data->master == dev) {
 			if (__sysmmu_disable(data)) {
 				data->master = NULL;
 				list_del_init(&data->domain_node);
 			}
 			found = true;
-			break;
 		}
 	}
 	spin_unlock_irqrestore(&priv->lock, flags);
-- 
1.9.2

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