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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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e4f10ffe4c
The of_iommu_{set/get}_ops() API is used to associate a device
tree node with a specific set of IOMMU operations. The same
kernel interface is required on systems booting with ACPI, where
devices are not associated with a device tree node, therefore
the interface requires generalization.
The struct device fwnode member represents the fwnode token associated
with the device and the struct it points at is firmware specific;
regardless, it is initialized on both ACPI and DT systems and makes an
ideal candidate to use it to associate a set of IOMMU operations to a
given device, through its struct device.fwnode member pointer, paving
the way for representing per-device iommu_ops (ie an iommu instance
associated with a device).
Convert the DT specific of_iommu_{set/get}_ops() interface to
use struct device.fwnode as a look-up token, making the interface
usable on ACPI systems and rename the data structures and the
registration API so that they are made to represent their usage
more clearly.
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Tomasz Nowicki <tn@semihalf.com>
Tested-by: Hanjun Guo <hanjun.guo@linaro.org>
Tested-by: Tomasz Nowicki <tn@semihalf.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Hanjun Guo <hanjun.guo@linaro.org>
Cc: Robin Murphy <robin.murphy@arm.com>
Cc: Joerg Roedel <joro@8bytes.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
53 lines
1.2 KiB
C
53 lines
1.2 KiB
C
#ifndef __OF_IOMMU_H
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#define __OF_IOMMU_H
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#include <linux/device.h>
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#include <linux/iommu.h>
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#include <linux/of.h>
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#ifdef CONFIG_OF_IOMMU
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extern int of_get_dma_window(struct device_node *dn, const char *prefix,
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int index, unsigned long *busno, dma_addr_t *addr,
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size_t *size);
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extern const struct iommu_ops *of_iommu_configure(struct device *dev,
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struct device_node *master_np);
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#else
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static inline int of_get_dma_window(struct device_node *dn, const char *prefix,
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int index, unsigned long *busno, dma_addr_t *addr,
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size_t *size)
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{
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return -EINVAL;
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}
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static inline const struct iommu_ops *of_iommu_configure(struct device *dev,
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struct device_node *master_np)
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{
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return NULL;
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}
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#endif /* CONFIG_OF_IOMMU */
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static inline void of_iommu_set_ops(struct device_node *np,
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const struct iommu_ops *ops)
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{
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iommu_register_instance(&np->fwnode, ops);
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}
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static inline const struct iommu_ops *of_iommu_get_ops(struct device_node *np)
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{
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return iommu_get_instance(&np->fwnode);
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}
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extern struct of_device_id __iommu_of_table;
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typedef int (*of_iommu_init_fn)(struct device_node *);
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#define IOMMU_OF_DECLARE(name, compat, fn) \
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_OF_DECLARE(iommu, name, compat, fn, of_iommu_init_fn)
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#endif /* __OF_IOMMU_H */
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