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77 lines
1.8 KiB
77 lines
1.8 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <linux/dma-mapping.h> |
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#include <asm/iommu_table.h> |
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#include <linux/string.h> |
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#include <linux/kallsyms.h> |
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static struct iommu_table_entry * __init |
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find_dependents_of(struct iommu_table_entry *start, |
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struct iommu_table_entry *finish, |
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struct iommu_table_entry *q) |
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{ |
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struct iommu_table_entry *p; |
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if (!q) |
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return NULL; |
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for (p = start; p < finish; p++) |
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if (p->detect == q->depend) |
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return p; |
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return NULL; |
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} |
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void __init sort_iommu_table(struct iommu_table_entry *start, |
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struct iommu_table_entry *finish) { |
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struct iommu_table_entry *p, *q, tmp; |
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for (p = start; p < finish; p++) { |
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again: |
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q = find_dependents_of(start, finish, p); |
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/* We are bit sneaky here. We use the memory address to figure |
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* out if the node we depend on is past our point, if so, swap. |
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*/ |
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if (q > p) { |
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tmp = *p; |
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memmove(p, q, sizeof(*p)); |
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*q = tmp; |
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goto again; |
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} |
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} |
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} |
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#ifdef DEBUG |
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void __init check_iommu_entries(struct iommu_table_entry *start, |
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struct iommu_table_entry *finish) |
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{ |
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struct iommu_table_entry *p, *q, *x; |
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/* Simple cyclic dependency checker. */ |
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for (p = start; p < finish; p++) { |
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q = find_dependents_of(start, finish, p); |
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x = find_dependents_of(start, finish, q); |
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if (p == x) { |
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printk(KERN_ERR "CYCLIC DEPENDENCY FOUND! %pS depends on %pS and vice-versa. BREAKING IT.\n", |
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p->detect, q->detect); |
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/* Heavy handed way..*/ |
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x->depend = NULL; |
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} |
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} |
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for (p = start; p < finish; p++) { |
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q = find_dependents_of(p, finish, p); |
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if (q && q > p) { |
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printk(KERN_ERR "EXECUTION ORDER INVALID! %pS should be called before %pS!\n", |
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p->detect, q->detect); |
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} |
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} |
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} |
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#else |
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void __init check_iommu_entries(struct iommu_table_entry *start, |
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struct iommu_table_entry *finish) |
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{ |
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} |
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#endif
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