From 1cd076bf67793942ed921b766f7d461de2ebc0a2 Mon Sep 17 00:00:00 2001 From: Will Deacon Date: Wed, 27 Aug 2014 14:40:58 +0100 Subject: iommu: provide early initialisation hook for IOMMU drivers IOMMU drivers must be initialised before any of their upstream devices, otherwise the relevant iommu_ops won't be configured for the bus in question. To solve this, a number of IOMMU drivers use initcalls to initialise the driver before anything has a chance to be probed. Whilst this solves the immediate problem, it leaves the job of probing the IOMMU completely separate from the iommu_ops to configure the IOMMU, which are called on a per-bus basis and require the driver to figure out exactly which instance of the IOMMU is being requested. In particular, the add_device callback simply passes a struct device to the driver, which then has to parse firmware tables or probe buses to identify the relevant IOMMU instance. This patch takes the first step in addressing this problem by adding an early initialisation pass for IOMMU drivers, giving them the ability to store some per-instance data in their iommu_ops structure and store that in their of_node. This can later be used when parsing OF masters to identify the IOMMU instance in question. Acked-by: Arnd Bergmann Acked-by: Joerg Roedel Acked-by: Marek Szyprowski Tested-by: Robin Murphy Signed-off-by: Will Deacon --- include/linux/of_iommu.h | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) (limited to 'include/linux/of_iommu.h') diff --git a/include/linux/of_iommu.h b/include/linux/of_iommu.h index 51a560f34bca..5762cdc8effe 100644 --- a/include/linux/of_iommu.h +++ b/include/linux/of_iommu.h @@ -1,12 +1,17 @@ #ifndef __OF_IOMMU_H #define __OF_IOMMU_H +#include +#include + #ifdef CONFIG_OF_IOMMU extern int of_get_dma_window(struct device_node *dn, const char *prefix, int index, unsigned long *busno, dma_addr_t *addr, size_t *size); +extern void of_iommu_init(void); + #else static inline int of_get_dma_window(struct device_node *dn, const char *prefix, @@ -16,6 +21,26 @@ static inline int of_get_dma_window(struct device_node *dn, const char *prefix, return -EINVAL; } +static inline void of_iommu_init(void) { } + #endif /* CONFIG_OF_IOMMU */ +static inline void of_iommu_set_ops(struct device_node *np, + const struct iommu_ops *ops) +{ + np->data = (struct iommu_ops *)ops; +} + +static inline struct iommu_ops *of_iommu_get_ops(struct device_node *np) +{ + return np->data; +} + +extern struct of_device_id __iommu_of_table; + +typedef int (*of_iommu_init_fn)(struct device_node *); + +#define IOMMU_OF_DECLARE(name, compat, fn) \ + _OF_DECLARE(iommu, name, compat, fn, of_iommu_init_fn) + #endif /* __OF_IOMMU_H */ -- cgit v1.2.1