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ACPI/IORT: Introduce iort_iommu_configure

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DT based systems have a generic kernel API to configure IOMMUs
for devices (ie of_iommu_configure()).

On ARM based ACPI systems, the of_iommu_configure() equivalent can
be implemented atop ACPI IORT kernel API, with the corresponding
functions to map device identifiers to IOMMUs and retrieve the
corresponding IOMMU operations necessary for DMA operations set-up.

By relying on the iommu_fwspec generic kernel infrastructure,
implement the IORT based IOMMU configuration for ARM ACPI systems
and hook it up in the ACPI kernel layer that implements DMA
configuration for a device.

Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> [ACPI core]
Reviewed-by: Tomasz Nowicki <tn@semihalf.com>
Tested-by: Hanjun Guo <hanjun.guo@linaro.org>
Tested-by: Tomasz Nowicki <tn@semihalf.com>
Cc: Hanjun Guo <hanjun.guo@linaro.org>
Cc: Tomasz Nowicki <tn@semihalf.com>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Lorenzo Pieralisi 2016-11-21 10:01:48 +00:00 • committed by Will Deacon
parent 618f535a60
commit 643b8e4d86
3 changed files with 110 additions and 1 deletions
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6
include/linux/acpi_iort.h
View file

@ -34,6 +34,8 @@ void acpi_iort_init(void);
bool iort_node_match(u8 type);
u32 iort_msi_map_rid(struct device *dev, u32 req_id);
struct irq_domain *iort_get_device_domain(struct device *dev, u32 req_id);
/* IOMMU interface */
const struct iommu_ops *iort_iommu_configure(struct device *dev);
#else
static inline void acpi_iort_init(void) { }
static inline bool iort_node_match(u8 type) { return false; }
@ -42,6 +44,10 @@ static inline u32 iort_msi_map_rid(struct device *dev, u32 req_id)
static inline struct irq_domain *iort_get_device_domain(struct device *dev,
u32 req_id)
{ return NULL; }
/* IOMMU interface */
static inline
const struct iommu_ops *iort_iommu_configure(struct device *dev)
{ return NULL; }
#endif
#define IORT_ACPI_DECLARE(name, table_id, fn) \