linux-kernel - [PATCH v2 2/2] iommu/omap: migrate to the generic fault report mechanism

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Message-Id: <1315941989-17199-1-git-send-email-ohad@wizery.com>
Date:	Tue, 13 Sep 2011 22:26:29 +0300
From:	Ohad Ben-Cohen <ohad@...ery.com>
To:	<iommu@...ts.linux-foundation.org>
Cc:	<linux-omap@...r.kernel.org>,
	Hiroshi DOYU <Hiroshi.DOYU@...ia.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Joerg Roedel <Joerg.Roedel@....com>,
	David Woodhouse <dwmw2@...radead.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	David Brown <davidb@...eaurora.org>,
	Arnd Bergmann <arnd@...db.de>, <linux-kernel@...r.kernel.org>,
	Ohad Ben-Cohen <ohad@...ery.com>
Subject: [PATCH v2 2/2] iommu/omap: migrate to the generic fault report mechanism

Start using the generic fault report mechanism, as provided by
the IOMMU core, and remove its now-redundant omap_iommu_set_isr API.

Currently we're only interested in letting upper layers know about the
fault, so in case the faulting device is a remote processor, they could
restart it.

Dynamic PTE/TLB loading is not supported.

Signed-off-by: Ohad Ben-Cohen <ohad@...ery.com>
---
 arch/arm/plat-omap/include/plat/iommu.h |    3 +--
 drivers/iommu/omap-iommu.c              |   31 +++----------------------------
 2 files changed, 4 insertions(+), 30 deletions(-)

diff --git a/arch/arm/plat-omap/include/plat/iommu.h b/arch/arm/plat-omap/include/plat/iommu.h
index 7f1df0e..a1d79ee 100644
--- a/arch/arm/plat-omap/include/plat/iommu.h
+++ b/arch/arm/plat-omap/include/plat/iommu.h
@@ -32,6 +32,7 @@ struct omap_iommu {
 	void __iomem	*regbase;
 	struct device	*dev;
 	void		*isr_priv;
+	struct iommu_domain *domain;
 
 	unsigned int	refcount;
 	spinlock_t	iommu_lock;	/* global for this whole object */
@@ -48,8 +49,6 @@ struct omap_iommu {
 	struct list_head	mmap;
 	struct mutex		mmap_lock; /* protect mmap */
 
-	int (*isr)(struct omap_iommu *obj, u32 da, u32 iommu_errs, void *priv);
-
 	void *ctx; /* iommu context: registres saved area */
 	u32 da_start;
 	u32 da_end;
diff --git a/drivers/iommu/omap-iommu.c b/drivers/iommu/omap-iommu.c
index bd5f606..7e0188f 100644
--- a/drivers/iommu/omap-iommu.c
+++ b/drivers/iommu/omap-iommu.c
@@ -775,6 +775,7 @@ static irqreturn_t iommu_fault_handler(int irq, void *data)
 	u32 da, errs;
 	u32 *iopgd, *iopte;
 	struct omap_iommu *obj = data;
+	struct iommu_domain *domain = obj->domain;
 
 	if (!obj->refcount)
 		return IRQ_NONE;
@@ -786,7 +787,7 @@ static irqreturn_t iommu_fault_handler(int irq, void *data)
 		return IRQ_HANDLED;
 
 	/* Fault callback or TLB/PTE Dynamic loading */
-	if (obj->isr && !obj->isr(obj, da, errs, obj->isr_priv))
+	if (!report_iommu_fault(domain, obj->dev, da, 0))
 		return IRQ_HANDLED;
 
 	iommu_disable(obj);
@@ -904,33 +905,6 @@ static void omap_iommu_detach(struct omap_iommu *obj)
 	dev_dbg(obj->dev, "%s: %s\n", __func__, obj->name);
 }
 
-int omap_iommu_set_isr(const char *name,
-		  int (*isr)(struct omap_iommu *obj, u32 da, u32 iommu_errs,
-			     void *priv),
-		  void *isr_priv)
-{
-	struct device *dev;
-	struct omap_iommu *obj;
-
-	dev = driver_find_device(&omap_iommu_driver.driver, NULL, (void *)name,
-				 device_match_by_alias);
-	if (!dev)
-		return -ENODEV;
-
-	obj = to_iommu(dev);
-	spin_lock(&obj->iommu_lock);
-	if (obj->refcount != 0) {
-		spin_unlock(&obj->iommu_lock);
-		return -EBUSY;
-	}
-	obj->isr = isr;
-	obj->isr_priv = isr_priv;
-	spin_unlock(&obj->iommu_lock);
-
-	return 0;
-}
-EXPORT_SYMBOL_GPL(omap_iommu_set_isr);
-
 /*
  *	OMAP Device MMU(IOMMU) detection
  */
@@ -1115,6 +1089,7 @@ omap_iommu_attach_dev(struct iommu_domain *domain, struct device *dev)
 	}
 
 	omap_domain->iommu_dev = oiommu;
+	oiommu->domain = domain;
 
 out:
 	spin_unlock(&omap_domain->lock);
-- 
1.7.4.1

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