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 <[email protected]> Cc: Christoph Hellwig <[email protected]> Cc: Robin Murphy <[email protected]> Cc: Konrad Rzeszutek Wilk <[email protected]> Tested-by: Nathan Chancellor <[email protected]> Signed-off-by: Will Deacon <[email protected]> --- kernel/dma/swiotlb.c | 21 +++++++++++++++------ 1 file changed, 15 insertions(+), 6 deletions(-) diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c index b3c793ed9e64..87c40517e822 100644 --- a/kernel/dma/swiotlb.c +++ b/kernel/dma/swiotlb.c @@ -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)); } -- 2.32.0.402.g57bb445576-goog _______________________________________________ iommu mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/iommu
