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| author | Laszlo Ersek <lersek@redhat.com> | 2017-08-26 22:15:46 +0200 |
|---|---|---|
| committer | Laszlo Ersek <lersek@redhat.com> | 2017-09-01 14:28:20 +0200 |
| commit | 5c8f091bd84d3706e2aad89e13ec00da11f6e5aa (patch) | |
| tree | 24ee42b97e8b81707eaa8532bf30fefb900397bf /OvmfPkg/VirtioGpuDxe/Commands.c | |
| parent | 5409c6abc8d8b8a7196fee1d4455845aacef23bd (diff) | |
| download | edk2-5c8f091bd84d3706e2aad89e13ec00da11f6e5aa.zip edk2-5c8f091bd84d3706e2aad89e13ec00da11f6e5aa.tar.gz edk2-5c8f091bd84d3706e2aad89e13ec00da11f6e5aa.tar.bz2 | |
OvmfPkg/VirtioGpuDxe: helpers for backing store (de)allocation+(un)mapping
Introduce the VirtioGpuAllocateZeroAndMapBackingStore() and
VirtioGpuUnmapAndFreeBackingStore() helper functions. These functions tie
together the allocation, zeroing and mapping, and unmapping and
deallocation, respectively, of memory that the virtio GPU will permanently
reference after receiving the RESOURCE_ATTACH_BACKING command.
With these functions we can keep the next patch simpler -- the GOP
implementation in "Gop.c" retains its error handling structure, and
remains oblivious to VIRTIO_DEVICE_PROTOCOL and VirtioLib.
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Brijesh Singh <brijesh.singh@amd.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Tested-by: Brijesh Singh <brijesh.singh@amd.com>
Diffstat (limited to 'OvmfPkg/VirtioGpuDxe/Commands.c')
| -rw-r--r-- | OvmfPkg/VirtioGpuDxe/Commands.c | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/OvmfPkg/VirtioGpuDxe/Commands.c b/OvmfPkg/VirtioGpuDxe/Commands.c index c1951a8..595a371 100644 --- a/OvmfPkg/VirtioGpuDxe/Commands.c +++ b/OvmfPkg/VirtioGpuDxe/Commands.c @@ -212,6 +212,126 @@ VirtioGpuUninit ( }
/**
+ Allocate, zero and map memory, for bus master common buffer operation, to be
+ attached as backing store to a host-side VirtIo GPU resource.
+
+ @param[in] VgpuDev The VGPU_DEV object that represents the VirtIo GPU
+ device.
+
+ @param[in] NumberOfPages The number of whole pages to allocate and map.
+
+ @param[out] HostAddress The system memory address of the allocated area.
+
+ @param[out] DeviceAddress The bus master device address of the allocated
+ area. The VirtIo GPU device may be programmed to
+ access the allocated area through DeviceAddress;
+ DeviceAddress is to be passed to the
+ VirtioGpuResourceAttachBacking() function, as the
+ BackingStoreDeviceAddress parameter.
+
+ @param[out] Mapping A resulting token to pass to
+ VirtioGpuUnmapAndFreeBackingStore().
+
+ @retval EFI_SUCCESS The requested number of pages has been allocated, zeroed
+ and mapped.
+
+ @return Status codes propagated from
+ VgpuDev->VirtIo->AllocateSharedPages() and
+ VirtioMapAllBytesInSharedBuffer().
+**/
+EFI_STATUS
+VirtioGpuAllocateZeroAndMapBackingStore (
+ IN VGPU_DEV *VgpuDev,
+ IN UINTN NumberOfPages,
+ OUT VOID **HostAddress,
+ OUT EFI_PHYSICAL_ADDRESS *DeviceAddress,
+ OUT VOID **Mapping
+ )
+{
+ EFI_STATUS Status;
+ VOID *NewHostAddress;
+
+ Status = VgpuDev->VirtIo->AllocateSharedPages (
+ VgpuDev->VirtIo,
+ NumberOfPages,
+ &NewHostAddress
+ );
+ if (EFI_ERROR (Status)) {
+ return Status;
+ }
+
+ //
+ // Avoid exposing stale data to the device even temporarily: zero the area
+ // before mapping it.
+ //
+ ZeroMem (NewHostAddress, EFI_PAGES_TO_SIZE (NumberOfPages));
+
+ Status = VirtioMapAllBytesInSharedBuffer (
+ VgpuDev->VirtIo, // VirtIo
+ VirtioOperationBusMasterCommonBuffer, // Operation
+ NewHostAddress, // HostAddress
+ EFI_PAGES_TO_SIZE (NumberOfPages), // NumberOfBytes
+ DeviceAddress, // DeviceAddress
+ Mapping // Mapping
+ );
+ if (EFI_ERROR (Status)) {
+ goto FreeSharedPages;
+ }
+
+ *HostAddress = NewHostAddress;
+ return EFI_SUCCESS;
+
+FreeSharedPages:
+ VgpuDev->VirtIo->FreeSharedPages (
+ VgpuDev->VirtIo,
+ NumberOfPages,
+ NewHostAddress
+ );
+ return Status;
+}
+
+/**
+ Unmap and free memory originally allocated and mapped with
+ VirtioGpuAllocateZeroAndMapBackingStore().
+
+ If the memory allocated and mapped with
+ VirtioGpuAllocateZeroAndMapBackingStore() was attached to a host-side VirtIo
+ GPU resource with VirtioGpuResourceAttachBacking(), then the caller is
+ responsible for detaching the backing store from the same resource, with
+ VirtioGpuResourceDetachBacking(), before calling this function.
+
+ @param[in] VgpuDev The VGPU_DEV object that represents the VirtIo GPU
+ device.
+
+ @param[in] NumberOfPages The NumberOfPages parameter originally passed to
+ VirtioGpuAllocateZeroAndMapBackingStore().
+
+ @param[in] HostAddress The HostAddress value originally output by
+ VirtioGpuAllocateZeroAndMapBackingStore().
+
+ @param[in] Mapping The token that was originally output by
+ VirtioGpuAllocateZeroAndMapBackingStore().
+**/
+VOID
+VirtioGpuUnmapAndFreeBackingStore (
+ IN VGPU_DEV *VgpuDev,
+ IN UINTN NumberOfPages,
+ IN VOID *HostAddress,
+ IN VOID *Mapping
+ )
+{
+ VgpuDev->VirtIo->UnmapSharedBuffer (
+ VgpuDev->VirtIo,
+ Mapping
+ );
+ VgpuDev->VirtIo->FreeSharedPages (
+ VgpuDev->VirtIo,
+ NumberOfPages,
+ HostAddress
+ );
+}
+
+/**
EFI_EVENT_NOTIFY function for the VGPU_DEV.ExitBoot event. It resets the
VirtIo device, causing it to release its resources and to forget its
configuration.
|