Commit 713d52a0 authored May 08, 2015 by Mitchel Humpherys Committed by Matt Wagantall Jun 05, 2015

iommu: io-pgtable-arm: flush tlb for stale mappings



There seems to be a bug in the unmap code that results in us leaving
stale mappings in the page table.  We can actually live with this as
long as we invalidate the tlb when a new mapping comes in on the same
virtual address (to prevent the walker from using the old, bogus
iova->phys mappings).

Change-Id: If5923e853e7ec542b12ca954d5f1c22dec5e5bb2
Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>

parent cba1ac43

drivers/iommu/io-pgtable-arm.c

+6 −2

Original line number	Diff line number	Diff line
		@@ -207,9 +207,13 @@ static int arm_lpae_init_pte(struct arm_lpae_io_pgtable *data,

		/* We require an unmap first */
		if (iopte_leaf(*ptep, lvl)) {
		WARN_ON(!selftest_running);
		if (!selftest_running) {
		*ptep = 0;
		data->iop.cfg.tlb->tlb_flush_all(data->iop.cookie);
		} else {
		return -EEXIST;
		}
		}

		if (data->iop.cfg.quirks & IO_PGTABLE_QUIRK_ARM_NS)
		pte \|= ARM_LPAE_PTE_NS;