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swiotlb: Add swiotlb_free() function
swiotlb_free() function frees all allocated memory for swiotlb. We need to initialize swiotlb before IOMMU initialization (x86 and powerpc needs to allocate memory from bootmem allocator). If IOMMU initialization is successful, we need to free swiotlb resource (don't want to waste 64MB). Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: chrisw@sous-sol.org Cc: dwmw2@infradead.org Cc: joerg.roedel@amd.com Cc: muli@il.ibm.com LKML-Reference: <1257849980-22640-8-git-send-email-fujita.tomonori@lab.ntt.co.jp> [ -v2: build fix for the !CONFIG_SWIOTLB case ] Signed-off-by: Ingo Molnar <mingo@elte.hu>
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@ -88,4 +88,10 @@ swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr);
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extern int
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swiotlb_dma_supported(struct device *hwdev, u64 mask);
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#ifdef CONFIG_SWIOTLB
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extern void __init swiotlb_free(void);
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#else
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static inline void swiotlb_free(void) { }
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#endif
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#endif /* __LINUX_SWIOTLB_H */
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@ -97,6 +97,8 @@ static phys_addr_t *io_tlb_orig_addr;
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*/
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static DEFINE_SPINLOCK(io_tlb_lock);
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static int late_alloc;
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static int __init
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setup_io_tlb_npages(char *str)
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{
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@ -262,6 +264,8 @@ swiotlb_late_init_with_default_size(size_t default_size)
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swiotlb_print_info(bytes);
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late_alloc = 1;
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return 0;
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cleanup4:
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@ -281,6 +285,32 @@ cleanup1:
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return -ENOMEM;
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}
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void __init swiotlb_free(void)
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{
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if (!io_tlb_overflow_buffer)
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return;
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if (late_alloc) {
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free_pages((unsigned long)io_tlb_overflow_buffer,
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get_order(io_tlb_overflow));
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free_pages((unsigned long)io_tlb_orig_addr,
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get_order(io_tlb_nslabs * sizeof(phys_addr_t)));
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free_pages((unsigned long)io_tlb_list, get_order(io_tlb_nslabs *
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sizeof(int)));
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free_pages((unsigned long)io_tlb_start,
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get_order(io_tlb_nslabs << IO_TLB_SHIFT));
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} else {
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free_bootmem_late(__pa(io_tlb_overflow_buffer),
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io_tlb_overflow);
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free_bootmem_late(__pa(io_tlb_orig_addr),
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io_tlb_nslabs * sizeof(phys_addr_t));
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free_bootmem_late(__pa(io_tlb_list),
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io_tlb_nslabs * sizeof(int));
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free_bootmem_late(__pa(io_tlb_start),
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io_tlb_nslabs << IO_TLB_SHIFT);
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}
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}
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static int is_swiotlb_buffer(phys_addr_t paddr)
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{
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return paddr >= virt_to_phys(io_tlb_start) &&
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