Some devices can tag their DMA requests with a 20-bit Process Address
Space ID (PASID), allowing them to access multiple address spaces. In
combination with recoverable I/O page faults (for example PCIe PRI),
PASID allows the IOMMU to share page tables with the MMU.
To make sure that a single PASID is allocated for each address space, as
required by Intel ENQCMD, store the PASID in the mm_struct. The IOMMU
driver is in charge of serializing modifications to the PASID field.
Signed-off-by: Jean-Philippe Brucker <jean-philippe@xxxxxxxxxx>
---
For the field's validity I'm thinking invalid PASID = 0. In ioasid.h we
define INVALID_IOASID as ~0U, but I think we can now change it to 0,
since Intel is now also reserving PASID #0 for Transactions without
PASID and AMD IOMMU uses GIoV for this too.
---
include/linux/mm_types.h | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 4aba6c0c2ba80..8db6472758175 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -534,6 +534,10 @@ struct mm_struct {
atomic_long_t hugetlb_usage;
#endif
struct work_struct async_put_work;
+#ifdef CONFIG_IOMMU_SUPPORT
+ /* Address space ID used by device DMA */
+ unsigned int pasid;
+#endif
} __randomize_layout;
/*
--
2.26.2
