Commit 5740afdb authored by FUJITA Tomonori's avatar FUJITA Tomonori Committed by Ingo Molnar
Browse files

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: default avatarFUJITA 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: default avatarIngo Molnar <mingo@elte.hu>
parent 9f993ac3

include/linux/swiotlb.h

+6 −0
Original line number Diff line number Diff line
@@ -88,4 +88,10 @@ swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr); 
extern int

swiotlb_dma_supported(struct device *hwdev, u64 mask);



#ifdef CONFIG_SWIOTLB

extern void __init swiotlb_free(void);

#else

static inline void swiotlb_free(void) { }

#endif



#endif /* __LINUX_SWIOTLB_H */

lib/swiotlb.c

+30 −0
Original line number Diff line number Diff line
@@ -97,6 +97,8 @@ static phys_addr_t *io_tlb_orig_addr; 
 */

static DEFINE_SPINLOCK(io_tlb_lock);



static int late_alloc;



static int __init

setup_io_tlb_npages(char *str)

{
@@ -262,6 +264,8 @@ swiotlb_late_init_with_default_size(size_t default_size) 


	swiotlb_print_info(bytes);



	late_alloc = 1;



	return 0;



cleanup4:
@@ -281,6 +285,32 @@ cleanup1: 
	return -ENOMEM;

}



void __init swiotlb_free(void)

{

	if (!io_tlb_overflow_buffer)

		return;



	if (late_alloc) {

		free_pages((unsigned long)io_tlb_overflow_buffer,

			   get_order(io_tlb_overflow));

		free_pages((unsigned long)io_tlb_orig_addr,

			   get_order(io_tlb_nslabs * sizeof(phys_addr_t)));

		free_pages((unsigned long)io_tlb_list, get_order(io_tlb_nslabs *

								 sizeof(int)));

		free_pages((unsigned long)io_tlb_start,

			   get_order(io_tlb_nslabs << IO_TLB_SHIFT));

	} else {

		free_bootmem_late(__pa(io_tlb_overflow_buffer),

				  io_tlb_overflow);

		free_bootmem_late(__pa(io_tlb_orig_addr),

				  io_tlb_nslabs * sizeof(phys_addr_t));

		free_bootmem_late(__pa(io_tlb_list),

				  io_tlb_nslabs * sizeof(int));

		free_bootmem_late(__pa(io_tlb_start),

				  io_tlb_nslabs << IO_TLB_SHIFT);

	}

}



static int is_swiotlb_buffer(phys_addr_t paddr)

{

	return paddr >= virt_to_phys(io_tlb_start) &&

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