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| author | Brijesh Singh <brijesh.singh@amd.com> | 2017-08-23 06:57:16 -0400 |
|---|---|---|
| committer | Laszlo Ersek <lersek@redhat.com> | 2017-08-25 10:42:18 +0200 |
| commit | 0a78d754edc82ed0dae07c3d505b88fce8b5bd09 (patch) | |
| tree | 2c0a20b5290f0afe0c372ea4a34fc64f37c9bcf6 /OvmfPkg/Library/VirtioLib | |
| parent | 084cfc1a35d4d9775c73345485596a12a71fd2a6 (diff) | |
| download | edk2-0a78d754edc82ed0dae07c3d505b88fce8b5bd09.tar.gz edk2-0a78d754edc82ed0dae07c3d505b88fce8b5bd09.tar.bz2 edk2-0a78d754edc82ed0dae07c3d505b88fce8b5bd09.zip | |
OvmfPkg/VirtioLib: add VirtioMapAllBytesInSharedBuffer() helper function
The function can be used for mapping the system physical address to virtio
device address using VIRTIO_DEVICE_PROTOCOL.MapSharedBuffer (). The
function helps with centralizing error handling, and it allows the caller
to pass in constant or other evaluated expressions for NumberOfBytes.
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
[lersek@redhat.com: s/This/VirtIo/ in the new function's comment blocks]
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Regression-tested-by: Laszlo Ersek <lersek@redhat.com>
Diffstat (limited to 'OvmfPkg/Library/VirtioLib')
| -rw-r--r-- | OvmfPkg/Library/VirtioLib/VirtioLib.c | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/OvmfPkg/Library/VirtioLib/VirtioLib.c b/OvmfPkg/Library/VirtioLib/VirtioLib.c index 845f206369..4ad38f0698 100644 --- a/OvmfPkg/Library/VirtioLib/VirtioLib.c +++ b/OvmfPkg/Library/VirtioLib/VirtioLib.c @@ -4,6 +4,7 @@ Copyright (C) 2012-2016, Red Hat, Inc.
Portion of Copyright (C) 2013, ARM Ltd.
+ Copyright (C) 2017, AMD Inc, All rights reserved.<BR>
This program and the accompanying materials are licensed and made available
under the terms and conditions of the BSD License which accompanies this
@@ -414,3 +415,87 @@ Virtio10WriteFeatures ( return Status;
}
+
+/**
+ Provides the virtio device address required to access system memory from a
+ DMA bus master.
+
+ The interface follows the same usage pattern as defined in UEFI spec 2.6
+ (Section 13.2 PCI Root Bridge I/O Protocol)
+
+ The VirtioMapAllBytesInSharedBuffer() is similar to VIRTIO_MAP_SHARED
+ with exception that NumberOfBytes is IN-only parameter. The function
+ maps all the bytes specified in NumberOfBytes param in one consecutive
+ range.
+
+ @param[in] VirtIo The virtio device for which the mapping is
+ requested.
+
+ @param[in] Operation Indicates if the bus master is going to
+ read or write to system memory.
+
+ @param[in] HostAddress The system memory address to map to shared
+ buffer address.
+
+ @param[in] NumberOfBytes Number of bytes to map.
+
+ @param[out] DeviceAddress The resulting shared map address for the
+ bus master to access the hosts HostAddress.
+
+ @param[out] Mapping A resulting token to pass to
+ VIRTIO_UNMAP_SHARED.
+
+
+ @retval EFI_SUCCESS The NumberOfBytes is succesfully mapped.
+ @retval EFI_UNSUPPORTED The HostAddress cannot be mapped as a
+ common buffer.
+ @retval EFI_INVALID_PARAMETER One or more parameters are invalid.
+ @retval EFI_OUT_OF_RESOURCES The request could not be completed due to
+ a lack of resources. This includes the case
+ when NumberOfBytes bytes cannot be mapped
+ in one consecutive range.
+ @retval EFI_DEVICE_ERROR The system hardware could not map the
+ requested address.
+**/
+EFI_STATUS
+EFIAPI
+VirtioMapAllBytesInSharedBuffer (
+ IN VIRTIO_DEVICE_PROTOCOL *VirtIo,
+ IN VIRTIO_MAP_OPERATION Operation,
+ IN VOID *HostAddress,
+ IN UINTN NumberOfBytes,
+ OUT EFI_PHYSICAL_ADDRESS *DeviceAddress,
+ OUT VOID **Mapping
+ )
+{
+ EFI_STATUS Status;
+ VOID *MapInfo;
+ UINTN Size;
+ EFI_PHYSICAL_ADDRESS PhysicalAddress;
+
+ Size = NumberOfBytes;
+ Status = VirtIo->MapSharedBuffer (
+ VirtIo,
+ Operation,
+ HostAddress,
+ &Size,
+ &PhysicalAddress,
+ &MapInfo
+ );
+ if (EFI_ERROR (Status)) {
+ return Status;
+ }
+
+ if (Size < NumberOfBytes) {
+ goto Failed;
+ }
+
+ *Mapping = MapInfo;
+ *DeviceAddress = PhysicalAddress;
+
+ return EFI_SUCCESS;
+
+Failed:
+ VirtIo->UnmapSharedBuffer (VirtIo, MapInfo);
+ return EFI_OUT_OF_RESOURCES;
+}
|