OvmfPkg: QemuBootOrderLib: recognize extra PCI root buses

The OFW device path that QEMU exports in the "bootorder" fw_cfg file, for
a device that is plugged into the main PCI root bus, is:

  /pci@i0cf8/...

Whereas the same device plugged into the N'th extra root bus results in:

  /pci@i0cf8,N/pci-bridge@0/...

(N is in hex.)

Extend TranslatePciOfwNodes() so that it not assume a single PCI root;
instead it parse the extra root bus serial number if present, and resolve
it in the translation to the UEFI devpath fragment.

Note that the "pci-bridge@0" node is a characteristic of QEMU's PXB
device. It reflects the actual emulated PCI hierarchy. We don't parse it
specifically in this patch, because it is automatically handled by the
bridge sequence translator added recently in SVN rev 17385 (git commit
feca17fa4b) -- "OvmfPkg: QemuBootOrderLib: parse OFW device path nodes of
PCI bridges".

The macro EXAMINED_OFW_NODES need not be raised from 6. The longest OFW
device paths that we wish to recognize under this new scheme comprise 5
nodes. The initial "extra root bus" OFW fragment, visible at the top,
takes up 2 nodes, after which the longest device-specific patterns (IDE
disk, IDE CD-ROM, ISA floppy, virtio-scsi disk) take 3 more nodes each.

Cc: Jordan Justen <jordan.l.justen@intel.com>
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://svn.code.sf.net/p/edk2/code/trunk/edk2@17965 6f19259b-4bc3-4df7-8a09-765794883524

1 files changed, 128 insertions, 24 deletions

diff --git a/OvmfPkg/Library/QemuBootOrderLib/QemuBootOrderLib.c b/OvmfPkg/Library/QemuBootOrderLib/QemuBootOrderLib.c
index 276d675f50..2e9634359d 100644
--- a/OvmfPkg/Library/QemuBootOrderLib/QemuBootOrderLib.c
+++ b/OvmfPkg/Library/QemuBootOrderLib/QemuBootOrderLib.c
@@ -27,6 +27,7 @@
 #include <Guid/GlobalVariable.h>

 #include <Guid/VirtioMmioTransport.h>

 

+#include "ExtraRootBusMap.h"

 

 /**

   OpenFirmware to UEFI device path translation output buffer size in CHAR16's.

@@ -556,6 +557,11 @@ ParseOfwNode (
 

   @param[in]     NumNodes        Number of elements in OfwNode.

 

+  @param[in]     ExtraPciRoots   An EXTRA_ROOT_BUS_MAP object created with

+                                 CreateExtraRootBusMap(), to be used for

+                                 translating positions of extra root buses to

+                                 bus numbers.

+

   @param[out]    Translated      Destination array receiving the UEFI path

                                  fragment, allocated by the caller. If the

                                  return value differs from RETURN_SUCCESS, its

@@ -576,16 +582,23 @@ ParseOfwNode (
   @retval RETURN_UNSUPPORTED       The array of OpenFirmware device nodes can't

                                    be translated in the current implementation.

 

+  @retval RETURN_PROTOCOL_ERROR    The initial OpenFirmware node refers to an

+                                   extra PCI root bus (by serial number) that

+                                   is invalid according to ExtraPciRoots.

+

 **/

 STATIC

 RETURN_STATUS

 TranslatePciOfwNodes (

-  IN      CONST OFW_NODE *OfwNode,

-  IN      UINTN          NumNodes,

-  OUT     CHAR16         *Translated,

-  IN OUT  UINTN          *TranslatedSize

+  IN      CONST OFW_NODE           *OfwNode,

+  IN      UINTN                    NumNodes,

+  IN      CONST EXTRA_ROOT_BUS_MAP *ExtraPciRoots,

+  OUT     CHAR16                   *Translated,

+  IN OUT  UINTN                    *TranslatedSize

   )

 {

+  UINT32 PciRoot;

+  CHAR8  *Comma;

   UINTN  FirstNonBridge;

   CHAR16 Bridges[BRIDGE_TRANSLATION_OUTPUT_SIZE];

   UINTN  BridgesLen;

@@ -594,7 +607,17 @@ TranslatePciOfwNodes (
   UINTN  Written;

 

   //

-  // Get PCI device and optional PCI function. Assume a single PCI root.

+  // Resolve the PCI root bus number.

+  //

+  // The initial OFW node for the main root bus (ie. bus number 0) is:

+  //

+  //   /pci@i0cf8

+  //

+  // For extra root buses, the initial OFW node is

+  //

+  //   /pci@i0cf8,4

+  //              ^

+  //              root bus serial number (not PCI bus number)

   //

   if (NumNodes < REQUIRED_PCI_OFW_NODES ||

       !SubstringEq (OfwNode[0].DriverName, "pci")

@@ -602,6 +625,35 @@ TranslatePciOfwNodes (
     return RETURN_UNSUPPORTED;

   }

 

+  PciRoot = 0;

+  Comma = ScanMem8 (OfwNode[0].UnitAddress.Ptr, OfwNode[0].UnitAddress.Len,

+            ',');

+  if (Comma != NULL) {

+    SUBSTRING PciRootSerialSubString;

+    UINT64    PciRootSerial;

+

+    //

+    // Parse the root bus serial number from the unit address after the comma.

+    //

+    PciRootSerialSubString.Ptr = Comma + 1;

+    PciRootSerialSubString.Len = OfwNode[0].UnitAddress.Len -

+                                 (PciRootSerialSubString.Ptr -

+                                  OfwNode[0].UnitAddress.Ptr);

+    NumEntries = 1;

+    if (RETURN_ERROR (ParseUnitAddressHexList (PciRootSerialSubString,

+                      &PciRootSerial, &NumEntries))) {

+      return RETURN_UNSUPPORTED;

+    }

+

+    //

+    // Map the extra root bus's serial number to its actual bus number.

+    //

+    if (EFI_ERROR (MapRootBusPosToBusNr (ExtraPciRoots, PciRootSerial,

+                     &PciRoot))) {

+      return RETURN_PROTOCOL_ERROR;

+    }

+  }

+

   //

   // Translate a sequence of PCI bridges. For each bridge, the OFW node is:

   //

@@ -709,7 +761,8 @@ TranslatePciOfwNodes (
     Written = UnicodeSPrintAsciiFormat (

       Translated,

       *TranslatedSize * sizeof (*Translated), // BufferSize in bytes

-      "PciRoot(0x0)%s/Pci(0x%Lx,0x%Lx)/Ata(%a,%a,0x0)",

+      "PciRoot(0x%x)%s/Pci(0x%Lx,0x%Lx)/Ata(%a,%a,0x0)",

+      PciRoot,

       Bridges,

       PciDevFun[0],

       PciDevFun[1],

@@ -753,7 +806,8 @@ TranslatePciOfwNodes (
     Written = UnicodeSPrintAsciiFormat (

       Translated,

       *TranslatedSize * sizeof (*Translated), // BufferSize in bytes

-      "PciRoot(0x0)%s/Pci(0x%Lx,0x%Lx)/Floppy(0x%Lx)",

+      "PciRoot(0x%x)%s/Pci(0x%Lx,0x%Lx)/Floppy(0x%Lx)",

+      PciRoot,

       Bridges,

       PciDevFun[0],

       PciDevFun[1],

@@ -781,7 +835,8 @@ TranslatePciOfwNodes (
     Written = UnicodeSPrintAsciiFormat (

       Translated,

       *TranslatedSize * sizeof (*Translated), // BufferSize in bytes

-      "PciRoot(0x0)%s/Pci(0x%Lx,0x%Lx)/HD(",

+      "PciRoot(0x%x)%s/Pci(0x%Lx,0x%Lx)/HD(",

+      PciRoot,

       Bridges,

       PciDevFun[0],

       PciDevFun[1]

@@ -825,7 +880,8 @@ TranslatePciOfwNodes (
     Written = UnicodeSPrintAsciiFormat (

       Translated,

       *TranslatedSize * sizeof (*Translated), // BufferSize in bytes

-      "PciRoot(0x0)%s/Pci(0x%Lx,0x%Lx)/Scsi(0x%Lx,0x%Lx)",

+      "PciRoot(0x%x)%s/Pci(0x%Lx,0x%Lx)/Scsi(0x%Lx,0x%Lx)",

+      PciRoot,

       Bridges,

       PciDevFun[0],

       PciDevFun[1],

@@ -849,7 +905,8 @@ TranslatePciOfwNodes (
     Written = UnicodeSPrintAsciiFormat (

       Translated,

       *TranslatedSize * sizeof (*Translated), // BufferSize in bytes

-      "PciRoot(0x0)%s/Pci(0x%Lx,0x%Lx)",

+      "PciRoot(0x%x)%s/Pci(0x%Lx,0x%Lx)",

+      PciRoot,

       Bridges,

       PciDevFun[0],

       PciDevFun[1]

@@ -1057,6 +1114,11 @@ TranslateMmioOfwNodes (
 

   @param[in]     NumNodes        Number of elements in OfwNode.

 

+  @param[in]     ExtraPciRoots   An EXTRA_ROOT_BUS_MAP object created with

+                                 CreateExtraRootBusMap(), to be used for

+                                 translating positions of extra root buses to

+                                 bus numbers.

+

   @param[out]    Translated      Destination array receiving the UEFI path

                                  fragment, allocated by the caller. If the

                                  return value differs from RETURN_SUCCESS, its

@@ -1077,14 +1139,19 @@ TranslateMmioOfwNodes (
   @retval RETURN_UNSUPPORTED       The array of OpenFirmware device nodes can't

                                    be translated in the current implementation.

 

+  @retval RETURN_PROTOCOL_ERROR    The array of OpenFirmware device nodes has

+                                   been (partially) recognized, but it contains

+                                   a logic error / doesn't match system state.

+

 **/

 STATIC

 RETURN_STATUS

 TranslateOfwNodes (

-  IN      CONST OFW_NODE *OfwNode,

-  IN      UINTN          NumNodes,

-  OUT     CHAR16         *Translated,

-  IN OUT  UINTN          *TranslatedSize

+  IN      CONST OFW_NODE           *OfwNode,

+  IN      UINTN                    NumNodes,

+  IN      CONST EXTRA_ROOT_BUS_MAP *ExtraPciRoots,

+  OUT     CHAR16                   *Translated,

+  IN OUT  UINTN                    *TranslatedSize

   )

 {

   RETURN_STATUS Status;

@@ -1092,8 +1159,8 @@ TranslateOfwNodes (
   Status = RETURN_UNSUPPORTED;

 

   if (FeaturePcdGet (PcdQemuBootOrderPciTranslation)) {

-    Status = TranslatePciOfwNodes (OfwNode, NumNodes, Translated,

-               TranslatedSize);

+    Status = TranslatePciOfwNodes (OfwNode, NumNodes, ExtraPciRoots,

+               Translated, TranslatedSize);

   }

   if (Status == RETURN_UNSUPPORTED &&

       FeaturePcdGet (PcdQemuBootOrderMmioTranslation)) {

@@ -1117,6 +1184,11 @@ TranslateOfwNodes (
                                  characters. In other error cases, it points to

                                  the byte that caused the error.

 

+  @param[in]     ExtraPciRoots   An EXTRA_ROOT_BUS_MAP object created with

+                                 CreateExtraRootBusMap(), to be used for

+                                 translating positions of extra root buses to

+                                 bus numbers.

+

   @param[out]    Translated      Destination array receiving the UEFI path

                                  fragment, allocated by the caller. If the

                                  return value differs from RETURN_SUCCESS, its

@@ -1142,6 +1214,12 @@ TranslateOfwNodes (
                                     the current implementation. Further calls

                                     to this function are possible.

 

+  @retval RETURN_PROTOCOL_ERROR     The OpenFirmware device path has been

+                                    (partially) recognized, but it contains a

+                                    logic error / doesn't match system state.

+                                    Further calls to this function are

+                                    possible.

+

   @retval RETURN_NOT_FOUND          Translation terminated. On input, *Ptr was

                                     pointing to the empty string or "HALT". On

                                     output, *Ptr points to the empty string

@@ -1154,9 +1232,10 @@ TranslateOfwNodes (
 STATIC

 RETURN_STATUS

 TranslateOfwPath (

-  IN OUT  CONST CHAR8 **Ptr,

-  OUT     CHAR16      *Translated,

-  IN OUT  UINTN       *TranslatedSize

+  IN OUT  CONST CHAR8              **Ptr,

+  IN      CONST EXTRA_ROOT_BUS_MAP *ExtraPciRoots,

+  OUT     CHAR16                   *Translated,

+  IN OUT  UINTN                    *TranslatedSize

   )

 {

   UINTN         NumNodes;

@@ -1204,6 +1283,7 @@ TranslateOfwPath (
   Status = TranslateOfwNodes (

              Node,

              NumNodes < EXAMINED_OFW_NODES ? NumNodes : EXAMINED_OFW_NODES,

+             ExtraPciRoots,

              Translated,

              TranslatedSize);

   switch (Status) {

@@ -1219,6 +1299,11 @@ TranslateOfwPath (
     DEBUG ((DEBUG_VERBOSE, "%a: unsupported\n", __FUNCTION__));

     break;

 

+  case RETURN_PROTOCOL_ERROR:

+    DEBUG ((DEBUG_VERBOSE, "%a: logic error / system state mismatch\n",

+      __FUNCTION__));

+    break;

+

   default:

     ASSERT (0);

   }

@@ -1512,6 +1597,8 @@ SetBootOrderFromQemu (
   ACTIVE_OPTION                    *ActiveOption;

   UINTN                            ActiveCount;

 

+  EXTRA_ROOT_BUS_MAP               *ExtraPciRoots;

+

   UINTN                            TranslatedSize;

   CHAR16                           Translated[TRANSLATION_OUTPUT_SIZE];

 

@@ -1556,13 +1643,24 @@ SetBootOrderFromQemu (
     goto ErrorFreeBootOrder;

   }

 

+  if (FeaturePcdGet (PcdQemuBootOrderPciTranslation)) {

+    Status = CreateExtraRootBusMap (&ExtraPciRoots);

+    if (EFI_ERROR (Status)) {

+      goto ErrorFreeActiveOption;

+    }

+  } else {

+    ExtraPciRoots = NULL;

+  }

+

   //

   // translate each OpenFirmware path

   //

   TranslatedSize = sizeof (Translated) / sizeof (Translated[0]);

-  Status = TranslateOfwPath (&FwCfgPtr, Translated, &TranslatedSize);

+  Status = TranslateOfwPath (&FwCfgPtr, ExtraPciRoots, Translated,

+             &TranslatedSize);

   while (Status == RETURN_SUCCESS ||

          Status == RETURN_UNSUPPORTED ||

+         Status == RETURN_PROTOCOL_ERROR ||

          Status == RETURN_BUFFER_TOO_SMALL) {

     if (Status == RETURN_SUCCESS) {

       UINTN Idx;

@@ -1582,7 +1680,7 @@ SetBootOrderFromQemu (
           //

           Status = BootOrderAppend (&BootOrder, &ActiveOption[Idx]);

           if (Status != RETURN_SUCCESS) {

-            goto ErrorFreeActiveOption;

+            goto ErrorFreeExtraPciRoots;

           }

           break;

         }

@@ -1590,7 +1688,8 @@ SetBootOrderFromQemu (
     }   // translation successful

 

     TranslatedSize = sizeof (Translated) / sizeof (Translated[0]);

-    Status = TranslateOfwPath (&FwCfgPtr, Translated, &TranslatedSize);

+    Status = TranslateOfwPath (&FwCfgPtr, ExtraPciRoots, Translated,

+               &TranslatedSize);

   } // scanning of OpenFirmware paths done

 

   if (Status == RETURN_NOT_FOUND && BootOrder.Produced > 0) {

@@ -1601,7 +1700,7 @@ SetBootOrderFromQemu (
     //

     Status = BootOrderComplete (&BootOrder, ActiveOption, ActiveCount);

     if (RETURN_ERROR (Status)) {

-      goto ErrorFreeActiveOption;

+      goto ErrorFreeExtraPciRoots;

     }

 

     //

@@ -1619,13 +1718,18 @@ SetBootOrderFromQemu (
                     );

     if (EFI_ERROR (Status)) {

       DEBUG ((DEBUG_ERROR, "%a: setting BootOrder: %r\n", __FUNCTION__, Status));

-      goto ErrorFreeActiveOption;

+      goto ErrorFreeExtraPciRoots;

     }

 

     DEBUG ((DEBUG_INFO, "%a: setting BootOrder: success\n", __FUNCTION__));

     PruneBootVariables (ActiveOption, ActiveCount);

   }

 

+ErrorFreeExtraPciRoots:

+  if (ExtraPciRoots != NULL) {

+    DestroyExtraRootBusMap (ExtraPciRoots);

+  }

+

 ErrorFreeActiveOption:

   FreePool (ActiveOption);