Author: br
Date: Fri Oct 9 13:11:14 2020
New Revision: 366571
URL: https://svnweb.freebsd.org/changeset/base/366571
Log:
Add iommu_get_dev_ctx() helper that allows to instantiate an iommu context
for a given device_t.
Submitted by: andrew
Reviewed by: kib
Sponsored by: DARPA, AFRL
Modified:
head/sys/dev/iommu/busdma_iommu.c
head/sys/dev/iommu/iommu.h
Modified: head/sys/dev/iommu/busdma_iommu.c
==============================================================================
--- head/sys/dev/iommu/busdma_iommu.c Fri Oct 9 12:44:56 2020
(r366570)
+++ head/sys/dev/iommu/busdma_iommu.c Fri Oct 9 13:11:14 2020
(r366571)
@@ -269,14 +269,12 @@ iommu_instantiate_ctx(struct iommu_unit *unit, device_
return (ctx);
}
-bus_dma_tag_t
-iommu_get_dma_tag(device_t dev, device_t child)
+struct iommu_ctx *
+iommu_get_dev_ctx(device_t dev)
{
struct iommu_unit *unit;
- struct iommu_ctx *ctx;
- bus_dma_tag_t res;
- unit = iommu_find(child, bootverbose);
+ unit = iommu_find(dev, bootverbose);
/* Not in scope of any IOMMU ? */
if (unit == NULL)
return (NULL);
@@ -288,8 +286,20 @@ iommu_get_dma_tag(device_t dev, device_t child)
dmar_instantiate_rmrr_ctxs(unit);
#endif
- ctx = iommu_instantiate_ctx(unit, child, false);
- res = ctx == NULL ? NULL : (bus_dma_tag_t)ctx->tag;
+ return (iommu_instantiate_ctx(unit, dev, false));
+}
+
+bus_dma_tag_t
+iommu_get_dma_tag(device_t dev, device_t child)
+{
+ struct iommu_ctx *ctx;
+ bus_dma_tag_t res;
+
+ ctx = iommu_get_dev_ctx(child);
+ if (ctx == NULL)
+ return (NULL);
+
+ res = (bus_dma_tag_t)ctx->tag;
return (res);
}
Modified: head/sys/dev/iommu/iommu.h
==============================================================================
--- head/sys/dev/iommu/iommu.h Fri Oct 9 12:44:56 2020 (r366570)
+++ head/sys/dev/iommu/iommu.h Fri Oct 9 13:11:14 2020 (r366571)
@@ -233,6 +233,7 @@ int bus_dma_iommu_load_ident(bus_dma_tag_t dmat, bus_d
vm_paddr_t start, vm_size_t length, int flags);
bus_dma_tag_t iommu_get_dma_tag(device_t dev, device_t child);
+struct iommu_ctx *iommu_get_dev_ctx(device_t dev);
SYSCTL_DECL(_hw_iommu);
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