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Message-id: <1407235677-26324-21-git-send-email-m.szyprowski@samsung.com>
Date: Tue, 05 Aug 2014 12:47:48 +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 20/29] iommu: exynos: refactor function parameters to simplify
code
This patch simplifies the code by:
- refactoring function parameters from struct device pointer to direct pointer
to struct sysmmu drvdata
- moving list_head enteries from struct exynos_iommu_owner directly to struct
sysmmu_drvdata
Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
---
drivers/iommu/exynos-iommu.c | 93 ++++++++++++++++++++++----------------------
1 file changed, 46 insertions(+), 47 deletions(-)
diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index ed8c518..018a615 100644
--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -187,8 +187,6 @@ static char *sysmmu_fault_name[SYSMMU_FAULTS_NUM] = {
/* attached to dev.archdata.iommu of the master device */
struct exynos_iommu_owner {
- struct list_head client; /* entry of exynos_iommu_domain.clients */
- struct device *dev;
struct device *sysmmu;
};
@@ -209,6 +207,7 @@ struct sysmmu_drvdata {
int activations;
spinlock_t lock;
struct iommu_domain *domain;
+ struct list_head domain_node;
phys_addr_t pgtable;
int version;
};
@@ -509,12 +508,10 @@ static void __sysmmu_tlb_invalidate_flpdcache(struct sysmmu_drvdata *data,
__raw_writel(iova | 0x1, data->sfrbase + REG_MMU_FLUSH_ENTRY);
}
-static void sysmmu_tlb_invalidate_flpdcache(struct device *dev,
+static void sysmmu_tlb_invalidate_flpdcache(struct sysmmu_drvdata *data,
sysmmu_iova_t iova)
{
unsigned long flags;
- struct exynos_iommu_owner *owner = dev->archdata.iommu;
- struct sysmmu_drvdata *data = dev_get_drvdata(owner->sysmmu);
if (!IS_ERR(data->clk_master))
clk_enable(data->clk_master);
@@ -528,14 +525,10 @@ static void sysmmu_tlb_invalidate_flpdcache(struct device *dev,
clk_disable(data->clk_master);
}
-static void sysmmu_tlb_invalidate_entry(struct device *dev, sysmmu_iova_t iova,
- size_t size)
+static void sysmmu_tlb_invalidate_entry(struct sysmmu_drvdata *data,
+ sysmmu_iova_t iova, size_t size)
{
- struct exynos_iommu_owner *owner = dev->archdata.iommu;
unsigned long flags;
- struct sysmmu_drvdata *data;
-
- data = dev_get_drvdata(owner->sysmmu);
spin_lock_irqsave(&data->lock, flags);
if (is_sysmmu_active(data)) {
@@ -565,8 +558,8 @@ static void sysmmu_tlb_invalidate_entry(struct device *dev, sysmmu_iova_t iova,
if (!IS_ERR(data->clk_master))
clk_disable(data->clk_master);
} else {
- dev_dbg(dev, "disabled. Skipping TLB invalidation @ %#x\n",
- iova);
+ dev_dbg(data->master,
+ "disabled. Skipping TLB invalidation @ %#x\n", iova);
}
spin_unlock_irqrestore(&data->lock, flags);
}
@@ -705,7 +698,7 @@ err_pgtable:
static void exynos_iommu_domain_destroy(struct iommu_domain *domain)
{
struct exynos_iommu_domain *priv = domain->priv;
- struct exynos_iommu_owner *owner;
+ struct sysmmu_drvdata *data;
unsigned long flags;
int i;
@@ -713,14 +706,12 @@ static void exynos_iommu_domain_destroy(struct iommu_domain *domain)
spin_lock_irqsave(&priv->lock, flags);
- list_for_each_entry(owner, &priv->clients, client) {
- while (!exynos_sysmmu_disable(owner->dev))
- ; /* until System MMU is actually disabled */
+ list_for_each_entry(data, &priv->clients, domain_node) {
+ if (__sysmmu_disable(data))
+ data->master = NULL;
+ list_del_init(&data->domain_node);
}
- while (!list_empty(&priv->clients))
- list_del_init(priv->clients.next);
-
spin_unlock_irqrestore(&priv->lock, flags);
for (i = 0; i < NUM_LV1ENTRIES; i++)
@@ -739,20 +730,26 @@ static int exynos_iommu_attach_device(struct iommu_domain *domain,
{
struct exynos_iommu_owner *owner = dev->archdata.iommu;
struct exynos_iommu_domain *priv = domain->priv;
+ struct sysmmu_drvdata *data;
phys_addr_t pagetable = virt_to_phys(priv->pgtable);
unsigned long flags;
- int ret;
+ int ret = -ENODEV;
- spin_lock_irqsave(&priv->lock, flags);
+ if (!has_sysmmu(dev))
+ return -ENODEV;
- ret = __exynos_sysmmu_enable(dev, pagetable, domain);
- if (ret == 0) {
- list_add_tail(&owner->client, &priv->clients);
- owner->domain = domain;
+ data = dev_get_drvdata(owner->sysmmu);
+ if (data) {
+ ret = __sysmmu_enable(data, pagetable, domain);
+ if (ret >= 0) {
+ data->master = dev;
+
+ spin_lock_irqsave(&priv->lock, flags);
+ list_add_tail(&data->domain_node, &priv->clients);
+ spin_unlock_irqrestore(&priv->lock, flags);
+ }
}
- spin_unlock_irqrestore(&priv->lock, flags);
-
if (ret < 0) {
dev_err(dev, "%s: Failed to attach IOMMU with pgtable %pa\n",
__func__, &pagetable);
@@ -768,26 +765,29 @@ static int exynos_iommu_attach_device(struct iommu_domain *domain,
static void exynos_iommu_detach_device(struct iommu_domain *domain,
struct device *dev)
{
- struct exynos_iommu_owner *owner;
struct exynos_iommu_domain *priv = domain->priv;
phys_addr_t pagetable = virt_to_phys(priv->pgtable);
+ struct sysmmu_drvdata *data;
unsigned long flags;
+ int found = 0;
- spin_lock_irqsave(&priv->lock, flags);
+ if (!has_sysmmu(dev))
+ return;
- list_for_each_entry(owner, &priv->clients, client) {
- if (owner == dev->archdata.iommu) {
- if (exynos_sysmmu_disable(dev)) {
- list_del_init(&owner->client);
- owner->domain = NULL;
+ spin_lock_irqsave(&priv->lock, flags);
+ list_for_each_entry(data, &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);
- if (owner == dev->archdata.iommu)
+ if (found)
dev_dbg(dev, "%s: Detached IOMMU with pgtable %pa\n",
__func__, &pagetable);
else
@@ -834,12 +834,11 @@ static sysmmu_pte_t *alloc_lv2entry(struct exynos_iommu_domain *priv,
* not currently mapped.
*/
if (need_flush_flpd_cache) {
- struct exynos_iommu_owner *owner;
+ struct sysmmu_drvdata *data;
spin_lock(&priv->lock);
- list_for_each_entry(owner, &priv->clients, client)
- sysmmu_tlb_invalidate_flpdcache(
- owner->dev, iova);
+ list_for_each_entry(data, &priv->clients, domain_node)
+ sysmmu_tlb_invalidate_flpdcache(data, iova);
spin_unlock(&priv->lock);
}
}
@@ -874,13 +873,13 @@ static int lv1set_section(struct exynos_iommu_domain *priv,
spin_lock(&priv->lock);
if (lv1ent_page_zero(sent)) {
- struct exynos_iommu_owner *owner;
+ struct sysmmu_drvdata *data;
/*
* Flushing FLPD cache in System MMU v3.3 that may cache a FLPD
* entry by speculative prefetch of SLPD which has no mapping.
*/
- list_for_each_entry(owner, &priv->clients, client)
- sysmmu_tlb_invalidate_flpdcache(owner->dev, iova);
+ list_for_each_entry(data, &priv->clients, domain_node)
+ sysmmu_tlb_invalidate_flpdcache(data, iova);
}
spin_unlock(&priv->lock);
@@ -985,13 +984,13 @@ static int exynos_iommu_map(struct iommu_domain *domain, unsigned long l_iova,
static void exynos_iommu_tlb_invalidate_entry(struct exynos_iommu_domain *priv,
sysmmu_iova_t iova, size_t size)
{
- struct exynos_iommu_owner *owner;
+ struct sysmmu_drvdata *data;
unsigned long flags;
spin_lock_irqsave(&priv->lock, flags);
- list_for_each_entry(owner, &priv->clients, client)
- sysmmu_tlb_invalidate_entry(owner->dev, iova, size);
+ list_for_each_entry(data, &priv->clients, domain_node)
+ sysmmu_tlb_invalidate_entry(data, iova, size);
spin_unlock_irqrestore(&priv->lock, flags);
}
--
1.9.2
--
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