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Groups > linux.kernel > #1554360

[PATCH v7 05/19] iommu: iommu_alloc_resv_region

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Introduce a new helper serving the purpose to allocate a reserved
region. This will be used in iommu driver implementing reserved
region callbacks.

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

---

v3 -> v4:
- add INIT_LIST_HEAD(&region->list)
- use int for prot param and add int type param
- remove implementation outside of CONFIG_IOMMU_API
---
 drivers/iommu/iommu.c | 18 ++++++++++++++++++
 include/linux/iommu.h |  2 ++
 2 files changed, 20 insertions(+)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 1cee5c3..927878d 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -1575,6 +1575,24 @@ void iommu_put_resv_regions(struct device *dev, struct list_head *list)
 		ops->put_resv_regions(dev, list);
 }
 
+struct iommu_resv_region *iommu_alloc_resv_region(phys_addr_t start,
+						  size_t length,
+						  int prot, int type)
+{
+	struct iommu_resv_region *region;
+
+	region = kzalloc(sizeof(*region), GFP_KERNEL);
+	if (!region)
+		return NULL;
+
+	INIT_LIST_HEAD(&region->list);
+	region->start = start;
+	region->length = length;
+	region->prot = prot;
+	region->type = type;
+	return region;
+}
+
 /* Request that a device is direct mapped by the IOMMU */
 int iommu_request_dm_for_dev(struct device *dev)
 {
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 233a6bf..f6bb55d3 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -244,6 +244,8 @@ extern void iommu_set_fault_handler(struct iommu_domain *domain,
 extern void iommu_get_resv_regions(struct device *dev, struct list_head *list);
 extern void iommu_put_resv_regions(struct device *dev, struct list_head *list);
 extern int iommu_request_dm_for_dev(struct device *dev);
+extern struct iommu_resv_region *
+iommu_alloc_resv_region(phys_addr_t start, size_t length, int prot, int type);
 
 extern int iommu_attach_group(struct iommu_domain *domain,
 			      struct iommu_group *group);
-- 
1.9.1

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[PATCH v7 00/19] KVM PCIe/MSI passthrough on ARM/ARM64 and IOVA reserved regions Eric Auger <eric.auger@redhat.com> - 2017-01-09 14:50 +0100
  [PATCH v7 09/19] iommu/vt-d: Implement reserved region get/put callbacks Eric Auger <eric.auger@redhat.com> - 2017-01-09 15:00 +0100
  [PATCH v7 06/19] iommu: Only map direct mapped regions Eric Auger <eric.auger@redhat.com> - 2017-01-09 15:00 +0100
  [PATCH v7 02/19] iommu/dma: Allow MSI-only cookies Eric Auger <eric.auger@redhat.com> - 2017-01-09 15:00 +0100
  [PATCH v7 05/19] iommu: iommu_alloc_resv_region Eric Auger <eric.auger@redhat.com> - 2017-01-09 15:00 +0100
  Re: [PATCH v7 00/19] KVM PCIe/MSI passthrough on ARM/ARM64 and IOVA  reserved regions Joerg Roedel <joro@8bytes.org> - 2017-01-10 15:20 +0100
    Re: [PATCH v7 00/19] KVM PCIe/MSI passthrough on ARM/ARM64 and IOVA  reserved regions Will Deacon <will.deacon@arm.com> - 2017-01-10 15:20 +0100
    Re: [PATCH v7 00/19] KVM PCIe/MSI passthrough on ARM/ARM64 and IOVA  reserved regions Auger Eric <eric.auger@redhat.com> - 2017-01-10 17:00 +0100

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