Add iommu fault report mechanism to the IOMMU API, so implementations
could report about mmu faults (translation errors, hardware errors,
etc..).
Fault reports can be used in several ways:
- mere logging
- reset the device that accessed the faulting address (may be necessary
in case the device is a remote processor for example)
- implement dynamic PTE/TLB loading
Currently the fault handler is installed when allocating a new domain
(less churn for users). Alternatively, we can also add a dedicated
iommu_set_fault_handler() API (presumably with notifiers).
Adopt OMAP's iommu driver (and remove its now-redundant
omap_iommu_set_isr API) and fix existing users of iommu_domain_alloc()
to pass NULL fault handlers.
OMAP's iommu driver will currently only pass the generic IOMMU_ERROR
fault, but in principle we can support dynamic PTE/TLB loading too
in the future.
Signed-off-by: Ohad Ben-Cohen o...@wizery.com
---
arch/arm/plat-omap/include/plat/iommu.h |3 +-
drivers/iommu/iommu.c | 10 +-
drivers/iommu/omap-iommu.c | 31 ++--
drivers/media/video/omap3isp/isp.c |2 +-
include/linux/iommu.h | 60 ++-
virt/kvm/iommu.c|2 +-
6 files changed, 74 insertions(+), 34 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 intrefcount;
spinlock_t iommu_lock; /* global for this whole object */
@@ -48,8 +49,6 @@ struct omap_iommu {
struct list_headmmap;
struct mutexmmap_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/iommu.c b/drivers/iommu/iommu.c
index e61a9ba..c08f1a0 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -40,7 +40,13 @@ bool iommu_found(void)
}
EXPORT_SYMBOL_GPL(iommu_found);
-struct iommu_domain *iommu_domain_alloc(void)
+/**
+ * iommu_domain_alloc() - allocate and initialize a new iommu domain
+ * @handler: an optional pointer to a fault handler, or NULL if not needed
+ *
+ * Returns the new domain, or NULL on error.
+ */
+struct iommu_domain *iommu_domain_alloc(iommu_fault_handler_t handler)
{
struct iommu_domain *domain;
int ret;
@@ -49,6 +55,8 @@ struct iommu_domain *iommu_domain_alloc(void)
if (!domain)
return NULL;
+ domain-handler = handler;
+
ret = iommu_ops-domain_init(domain);
if (ret)
goto out_free;
diff --git a/drivers/iommu/omap-iommu.c b/drivers/iommu/omap-iommu.c
index bd5f606..089fddc 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, IOMMU_ERROR))
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:
