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swiotlb: Free tbl memory in swiotlb_exit()

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Although swiotlb_exit() frees the 'slots' metadata array referenced by
'io_tlb_default_mem', it leaves the underlying buffer pages allocated
despite no longer being usable.

Extend swiotlb_exit() to free the buffer pages as well as the slots
array.

Cc: Claire Chang <tientzu@chromium.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Robin Murphy <robin.murphy@arm.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Tested-by: Claire Chang <tientzu@chromium.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Konrad Rzeszutek Wilk <konrad@kernel.org>
This commit is contained in:
Will Deacon 2021-07-20 14:38:26 +01:00 committed by Konrad Rzeszutek Wilk
parent 1efd3fc0cc
commit ad6c002831
1 changed files with 15 additions and 6 deletions
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21
kernel/dma/swiotlb.c
View file

@ -328,18 +328,27 @@ swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs)
void __init swiotlb_exit(void)
{
size_t size;
struct io_tlb_mem *mem = &io_tlb_default_mem;
unsigned long tbl_vaddr;
size_t tbl_size, slots_size;
if (!mem->nslabs)
return;
pr_info("tearing down default memory pool\n");
size = array_size(sizeof(*mem->slots), mem->nslabs);
if (mem->late_alloc)
free_pages((unsigned long)mem->slots, get_order(size));
else
memblock_free_late(__pa(mem->slots), PAGE_ALIGN(size));
tbl_vaddr = (unsigned long)phys_to_virt(mem->start);
tbl_size = PAGE_ALIGN(mem->end - mem->start);
slots_size = PAGE_ALIGN(array_size(sizeof(*mem->slots), mem->nslabs));
set_memory_encrypted(tbl_vaddr, tbl_size >> PAGE_SHIFT);
if (mem->late_alloc) {
free_pages(tbl_vaddr, get_order(tbl_size));
free_pages((unsigned long)mem->slots, get_order(slots_size));
} else {
memblock_free_late(mem->start, tbl_size);
memblock_free_late(__pa(mem->slots), slots_size);
}
memset(mem, 0, sizeof(*mem));
}