/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_IOMMU_TABLE_H
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#define _ASM_X86_IOMMU_TABLE_H
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#include <asm/swiotlb.h>
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/*
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* History lesson:
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* The execution chain of IOMMUs in 2.6.36 looks as so:
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*
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* [xen-swiotlb]
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* |
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* +----[swiotlb *]--+
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* / | \
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* / | \
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* [GART] [Calgary] [Intel VT-d]
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* /
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* /
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* [AMD-Vi]
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*
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* *: if SWIOTLB detected 'iommu=soft'/'swiotlb=force' it would skip
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* over the rest of IOMMUs and unconditionally initialize the SWIOTLB.
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* Also it would surreptitiously initialize set the swiotlb=1 if there were
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* more than 4GB and if the user did not pass in 'iommu=off'. The swiotlb
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* flag would be turned off by all IOMMUs except the Calgary one.
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*
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* The IOMMU_INIT* macros allow a similar tree (or more complex if desired)
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* to be built by defining who we depend on.
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*
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* And all that needs to be done is to use one of the macros in the IOMMU
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* and the pci-dma.c will take care of the rest.
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*/
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struct iommu_table_entry {
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initcall_t detect;
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initcall_t depend;
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void (*early_init)(void); /* No memory allocate available. */
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void (*late_init)(void); /* Yes, can allocate memory. */
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#define IOMMU_FINISH_IF_DETECTED (1<<0)
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#define IOMMU_DETECTED (1<<1)
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int flags;
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};
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/*
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* Macro fills out an entry in the .iommu_table that is equivalent
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* to the fields that 'struct iommu_table_entry' has. The entries
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* that are put in the .iommu_table section are not put in any order
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* hence during boot-time we will have to resort them based on
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* dependency. */
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#define __IOMMU_INIT(_detect, _depend, _early_init, _late_init, _finish)\
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static const struct iommu_table_entry \
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__iommu_entry_##_detect __used \
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__attribute__ ((unused, __section__(".iommu_table"), \
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aligned((sizeof(void *))))) \
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= {_detect, _depend, _early_init, _late_init, \
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_finish ? IOMMU_FINISH_IF_DETECTED : 0}
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/*
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* The simplest IOMMU definition. Provide the detection routine
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* and it will be run after the SWIOTLB and the other IOMMUs
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* that utilize this macro. If the IOMMU is detected (ie, the
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* detect routine returns a positive value), the other IOMMUs
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* are also checked. You can use IOMMU_INIT_POST_FINISH if you prefer
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* to stop detecting the other IOMMUs after yours has been detected.
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*/
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#define IOMMU_INIT_POST(_detect) \
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__IOMMU_INIT(_detect, pci_swiotlb_detect_4gb, NULL, NULL, 0)
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#define IOMMU_INIT_POST_FINISH(detect) \
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__IOMMU_INIT(_detect, pci_swiotlb_detect_4gb, NULL, NULL, 1)
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/*
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* A more sophisticated version of IOMMU_INIT. This variant requires:
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* a). A detection routine function.
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* b). The name of the detection routine we depend on to get called
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* before us.
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* c). The init routine which gets called if the detection routine
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* returns a positive value from the pci_iommu_alloc. This means
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* no presence of a memory allocator.
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* d). Similar to the 'init', except that this gets called from pci_iommu_init
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* where we do have a memory allocator.
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*
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* The standard IOMMU_INIT differs from the IOMMU_INIT_FINISH variant
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* in that the former will continue detecting other IOMMUs in the call
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* list after the detection routine returns a positive number, while the
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* latter will stop the execution chain upon first successful detection.
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* Both variants will still call the 'init' and 'late_init' functions if
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* they are set.
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*/
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#define IOMMU_INIT_FINISH(_detect, _depend, _init, _late_init) \
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__IOMMU_INIT(_detect, _depend, _init, _late_init, 1)
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#define IOMMU_INIT(_detect, _depend, _init, _late_init) \
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__IOMMU_INIT(_detect, _depend, _init, _late_init, 0)
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void sort_iommu_table(struct iommu_table_entry *start,
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struct iommu_table_entry *finish);
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void check_iommu_entries(struct iommu_table_entry *start,
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struct iommu_table_entry *finish);
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#endif /* _ASM_X86_IOMMU_TABLE_H */
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