Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1556347

[PATCH v8 03/18] iommu: Add a new type field in iommu_resv_region

Show all headers | View raw

We introduce a new field to differentiate the reserved region
types and specialize the apply_resv_region implementation.

Legacy direct mapped regions have IOMMU_RESV_DIRECT type.
We introduce 2 new reserved memory types:
- IOMMU_RESV_MSI will characterize MSI regions that are mapped
- IOMMU_RESV_RESERVED characterize regions that cannot by mapped.

Signed-off-by: Eric Auger <eric.auger@redhat.com>

---

v6 -> v7:
- rename IOMMU_RESV_NOMAP into IOMMU_RESV_RESERVED
---
 drivers/iommu/amd_iommu.c | 1 +
 include/linux/iommu.h     | 7 +++++++
 2 files changed, 8 insertions(+)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index f7a024f..5f7ea4f 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -3186,6 +3186,7 @@ static void amd_iommu_get_resv_regions(struct device *dev,
 
 		region->start = entry->address_start;
 		region->length = entry->address_end - entry->address_start;
+		region->type = IOMMU_RESV_DIRECT;
 		if (entry->prot & IOMMU_PROT_IR)
 			region->prot |= IOMMU_READ;
 		if (entry->prot & IOMMU_PROT_IW)
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index bfecb8b..233a6bf 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -117,18 +117,25 @@ enum iommu_attr {
 	DOMAIN_ATTR_MAX,
 };
 
+/* These are the possible reserved region types */
+#define IOMMU_RESV_DIRECT	(1 << 0)
+#define IOMMU_RESV_RESERVED	(1 << 1)
+#define IOMMU_RESV_MSI		(1 << 2)
+
 /**
  * struct iommu_resv_region - descriptor for a reserved memory region
  * @list: Linked list pointers
  * @start: System physical start address of the region
  * @length: Length of the region in bytes
  * @prot: IOMMU Protection flags (READ/WRITE/...)
+ * @type: Type of the reserved region
  */
 struct iommu_resv_region {
 	struct list_head	list;
 	phys_addr_t		start;
 	size_t			length;
 	int			prot;
+	int			type;
 };
 
 #ifdef CONFIG_IOMMU_API
-- 
1.9.1

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

[PATCH v8 00/18] KVM PCIe/MSI passthrough on ARM/ARM64 and IOVA reserved regions Eric Auger <eric.auger@redhat.com> - 2017-01-11 10:50 +0100
  [PATCH v8 04/18] iommu: iommu_alloc_resv_region Eric Auger <eric.auger@redhat.com> - 2017-01-11 10:50 +0100
  [PATCH v8 03/18] iommu: Add a new type field in iommu_resv_region Eric Auger <eric.auger@redhat.com> - 2017-01-11 10:50 +0100
  [PATCH v8 14/18] irqdomain: irq_domain_check_msi_remap Eric Auger <eric.auger@redhat.com> - 2017-01-11 10:50 +0100
  RE: [PATCH v8 00/18] KVM PCIe/MSI passthrough on ARM/ARM64 and IOVA  reserved regions Bharat Bhushan <bharat.bhushan@nxp.com> - 2017-01-12 05:10 +0100
    Re: [PATCH v8 00/18] KVM PCIe/MSI passthrough on ARM/ARM64 and IOVA  reserved regions Auger Eric <eric.auger@redhat.com> - 2017-01-12 08:50 +0100
  Re: [PATCH v8 00/18] KVM PCIe/MSI passthrough on ARM/ARM64 and IOVA  reserved regions Tomasz Nowicki <tn@semihalf.com> - 2017-01-13 15:00 +0100
    Re: [PATCH v8 00/18] KVM PCIe/MSI passthrough on ARM/ARM64 and IOVA  reserved regions Auger Eric <eric.auger@redhat.com> - 2017-01-16 10:10 +0100

csiph-web