[PATCH v2 4/6] iommu: Add granule_ignore when tlb gather

Yong Wu
2020-11-19T06:19:19Z

Add a granule_ignore option when tlb gather for some HW which don't care
about granule when it flush tlb.

Signed-off-by: Yong Wu <yong.wu@mediatek.com>
---
include/linux/iommu.h | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 794d4085edd3..1aad32238510 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -171,6 +171,7 @@ enum iommu_dev_features {
* @start: IOVA representing the start of the range to be flushed
* @end: IOVA representing the end of the range to be flushed (exclusive)
* @pgsize: The interval at which to perform the flush
+ * @granule_ignore: For tlb flushing that could be regardless of granule.
*
* This structure is intended to be updated by multiple calls to the
* ->unmap() function in struct iommu_ops before eventually being passed
@@ -180,6 +181,7 @@ struct iommu_iotlb_gather {
unsigned long start;
unsigned long end;
size_t pgsize;
+ bool granule_ignore;
};

/**
@@ -544,7 +546,7 @@ static inline void iommu_iotlb_gather_add_page(struct iommu_domain *domain,
* a different granularity, then sync the TLB so that the gather
* structure can be rewritten.
*/
- if (gather->pgsize != size ||
+ if ((!gather->granule_ignore && gather->pgsize != size) ||
end < gather->start || start > gather->end) {
if (gather->pgsize)
iommu_iotlb_sync(domain, gather);
--
2.18.0