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msm: iommu: Don't flush page tables if no devices attached 

Don't flush the page tables on an IOMMU domain if there are
no IOMMU devices attached to the domain. The act of
attaching to the domain will cause an implicit flush of
those areas if the page tables are configured to not be L2
cacheable.

Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>
Signed-off-by: Daniel Walker <dwalker@codeaurora.org>
This commit is contained in:
Stepan Moskovchenko 2010-11-12 19:29:54 -08:00 committed by Daniel Walker
parent 516cbc793e
commit f6f41eb9cc
1 changed files with 9 additions and 6 deletions
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15
arch/arm/mach-msm/iommu.c
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@ -50,13 +50,16 @@ static void __flush_iotlb(struct iommu_domain *domain)
unsigned long *fl_table = priv->pgtable;
int i;
dmac_flush_range(fl_table, fl_table + SZ_16K);
if (!list_empty(&priv->list_attached)) {
dmac_flush_range(fl_table, fl_table + SZ_16K);
for (i = 0; i < NUM_FL_PTE; i++)
if ((fl_table[i] & 0x03) == FL_TYPE_TABLE) {
void *sl_table = __va(fl_table[i] & FL_BASE_MASK);
dmac_flush_range(sl_table, sl_table + SZ_4K);
}
for (i = 0; i < NUM_FL_PTE; i++)
if ((fl_table[i] & 0x03) == FL_TYPE_TABLE) {
void *sl_table = __va(fl_table[i] &
FL_BASE_MASK);
dmac_flush_range(sl_table, sl_table + SZ_4K);
}
}
#endif
list_for_each_entry(ctx_drvdata, &priv->list_attached, attached_elm) {