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OvmfPkg: librarize reusable bits from VirtioBlkDxe's SynchronousRequest()

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new VirtioLib functions:
- VirtioPrepare(): prepare for appending descriptors
- VirtioFlush(): submit descriptor chain and await host answer

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13844 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
jljusten
2012-10-12 18:54:35 +00:00
parent 7fcacd6c92
commit e371e7e545
4 changed files with 205 additions and 66 deletions
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76
OvmfPkg/Include/Library/VirtioLib.h
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@@ -135,6 +135,36 @@ VirtioRingUninit (
);
//
// Internal use structure for tracking the submission of a multi-descriptor
// request.
//
typedef struct {
UINT16 HeadIdx;
UINT16 NextAvailIdx;
} DESC_INDICES;
/**
Turn off interrupt notifications from the host, and prepare for appending
multiple descriptors to the virtio ring.
The calling driver must be in VSTAT_DRIVER_OK state.
@param[in out] Ring The virtio ring we intend to append descriptors to.
@param[out] Indices The DESC_INDICES structure to initialize.
**/
VOID
EFIAPI
VirtioPrepare (
IN OUT VRING *Ring,
OUT DESC_INDICES *Indices
);
/**
Append a contiguous buffer for transmission / reception via the virtio ring.
@@ -148,6 +178,9 @@ VirtioRingUninit (
request submission. It is the calling driver's responsibility to verify the
ring size in advance.
The caller is responsible for initializing *Indices with VirtioPrepare()
first.
@param[in out] Ring The virtio ring to append the buffer to, as a
descriptor.
@@ -164,6 +197,8 @@ VirtioRingUninit (
host only interprets it dependent on
VRING_DESC_F_NEXT.
In *Indices:
@param [in] HeadIdx The index identifying the head buffer (first
buffer appended) belonging to this same
request.
@@ -176,12 +211,41 @@ VirtioRingUninit (
VOID
EFIAPI
VirtioAppendDesc (
IN OUT VRING *Ring,
IN UINTN BufferPhysAddr,
IN UINT32 BufferSize,
IN UINT16 Flags,
IN UINT16 HeadIdx,
IN OUT UINT16 *NextAvailIdx
IN OUT VRING *Ring,
IN UINTN BufferPhysAddr,
IN UINT32 BufferSize,
IN UINT16 Flags,
IN OUT DESC_INDICES *Indices
);
/**
Notify the host about appended descriptors and wait until it processes the
last one (ie. all of them).
@param[in] PciIo The target virtio PCI device to notify.
@param[in] VirtQueueId Identifies the queue for the target device.
@param[in out] Ring The virtio ring with descriptors to submit.
@param[in] Indices The function waits until the host processes
descriptors up to Indices->NextAvailIdx.
@return Error code from VirtioWrite() if it fails.
@retval EFI_SUCCESS Otherwise, the host processed all descriptors.
**/
EFI_STATUS
EFIAPI
VirtioFlush (
IN EFI_PCI_IO_PROTOCOL *PciIo,
IN UINT16 VirtQueueId,
IN OUT VRING *Ring,
IN DESC_INDICES *Indices
);
#endif // _VIRTIO_LIB_H_