[PATCH v2 3/6] ArmVirtPkg: implement FdtPciHostBridgeLib

[Ard Biesheuvel <ard.biesheuvel@linaro.org>]

Implement PciHostBridgeLib for DT platforms that expose a PCI root bridge
via a pci-host-ecam-generic DT node. The DT parsing logic is copied from
the PciHostBridgeDxe implementation in ArmVirtPkg, with the one notable
difference that we don't set the various legacy PCI attributes for IDE
and VGA I/O ranges.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Ref: https://tianocore.acgmultimedia.com/show_bug.cgi?id=65
---
 ArmVirtPkg/Library/FdtPciHostBridgeLib/FdtPciHostBridgeLib.c   | 400 ++++++++++++++++++++
 ArmVirtPkg/Library/FdtPciHostBridgeLib/FdtPciHostBridgeLib.inf |  56 +++
 2 files changed, 456 insertions(+)

diff --git a/ArmVirtPkg/Library/FdtPciHostBridgeLib/FdtPciHostBridgeLib.c b/ArmVirtPkg/Library/FdtPciHostBridgeLib/FdtPciHostBridgeLib.c
new file mode 100644
index 000000000000..c2aa4a339c19
--- /dev/null
+++ b/ArmVirtPkg/Library/FdtPciHostBridgeLib/FdtPciHostBridgeLib.c
@@ -0,0 +1,400 @@
+/** @file
+  PCI Host Bridge Library instance for pci-ecam-generic DT nodes
+
+  Copyright (c) 2016, Linaro Ltd. 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
+  distribution. The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php.
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR
+  IMPLIED.
+
+**/
+#include <PiDxe.h>
+#include <Library/PciHostBridgeLib.h>
+#include <Library/DebugLib.h>
+#include <Library/DevicePathLib.h>
+#include <Library/MemoryAllocationLib.h>
+#include <Library/PcdLib.h>
+#include <Library/UefiBootServicesTableLib.h>
+
+#include <Protocol/FdtClient.h>
+#include <Protocol/PciRootBridgeIo.h>
+#include <Protocol/PciHostBridgeResourceAllocation.h>
+
+#pragma pack(1)
+typedef struct {
+  ACPI_HID_DEVICE_PATH     AcpiDevicePath;
+  EFI_DEVICE_PATH_PROTOCOL EndDevicePath;
+} EFI_PCI_ROOT_BRIDGE_DEVICE_PATH;
+#pragma pack ()
+
+STATIC EFI_PCI_ROOT_BRIDGE_DEVICE_PATH mEfiPciRootBridgeDevicePath = {
+  {
+    {
+      ACPI_DEVICE_PATH,
+      ACPI_DP,
+      {
+        (UINT8) (sizeof(ACPI_HID_DEVICE_PATH)),
+        (UINT8) ((sizeof(ACPI_HID_DEVICE_PATH)) >> 8)
+      }
+    },
+    EISA_PNP_ID(0x0A08), // PCI Express
+    0
+  },
+
+  {
+    END_DEVICE_PATH_TYPE,
+    END_ENTIRE_DEVICE_PATH_SUBTYPE,
+    {
+      END_DEVICE_PATH_LENGTH,
+      0
+    }
+  }
+};
+
+GLOBAL_REMOVE_IF_UNREFERENCED
+CHAR16 *mPciHostBridgeLibAcpiAddressSpaceTypeStr[] = {
+  L"Mem", L"I/O", L"Bus"
+};
+
+//
+// We expect the "ranges" property of "pci-host-ecam-generic" to consist of
+// records like this.
+//
+#pragma pack (1)
+typedef struct {
+  UINT32 Type;
+  UINT64 ChildBase;
+  UINT64 CpuBase;
+  UINT64 Size;
+} DTB_PCI_HOST_RANGE_RECORD;
+#pragma pack ()
+
+#define DTB_PCI_HOST_RANGE_RELOCATABLE  BIT31
+#define DTB_PCI_HOST_RANGE_PREFETCHABLE BIT30
+#define DTB_PCI_HOST_RANGE_ALIASED      BIT29
+#define DTB_PCI_HOST_RANGE_MMIO32       BIT25
+#define DTB_PCI_HOST_RANGE_MMIO64       (BIT25 | BIT24)
+#define DTB_PCI_HOST_RANGE_IO           BIT24
+#define DTB_PCI_HOST_RANGE_TYPEMASK     (BIT31 | BIT30 | BIT29 | BIT25 | BIT24)
+
+STATIC
+EFI_STATUS
+ProcessPciHost (
+  OUT  UINT64    *IoBase,
+  OUT  UINT64    *IoSize,
+  OUT  UINT64    *MmioBase,
+  OUT  UINT64    *MmioSize,
+  OUT  UINT32    *BusMin,
+  OUT  UINT32    *BusMax
+  )
+{
+  FDT_CLIENT_PROTOCOL         *FdtClient;
+  INT32                       Node;
+  UINT64                      ConfigBase, ConfigSize;
+  CONST VOID                  *Prop;
+  UINT32                      Len;
+  UINT32                      RecordIdx;
+  EFI_STATUS                  Status;
+  UINT64                      IoTranslation;
+  UINT64                      MmioTranslation;
+
+  //
+  // The following output arguments are initialized only in
+  // order to suppress '-Werror=maybe-uninitialized' warnings
+  // *incorrectly* emitted by some gcc versions.
+  //
+  *IoBase = 0;
+  *MmioBase = 0;
+  *BusMin = 0;
+  *BusMax = 0;
+
+  //
+  // *IoSize, *MmioSize and IoTranslation are initialized to zero because the
+  // logic below requires it. However, since they are also affected by the issue
+  // reported above, they are initialized early.
+  //
+  *IoSize = 0;
+  *MmioSize = 0;
+  IoTranslation = 0;
+
+  Status = gBS->LocateProtocol (&gFdtClientProtocolGuid, NULL,
+                  (VOID **)&FdtClient);
+  ASSERT_EFI_ERROR (Status);
+
+  Status = FdtClient->FindCompatibleNode (FdtClient, "pci-host-ecam-generic",
+                        &Node);
+  if (EFI_ERROR (Status)) {
+    DEBUG ((EFI_D_INFO,
+      "%a: No 'pci-host-ecam-generic' compatible DT node found\n",
+      __FUNCTION__));
+    return EFI_NOT_FOUND;
+  }
+
+  DEBUG_CODE (
+    INT32 Tmp;
+
+    //
+    // A DT can legally describe multiple PCI host bridges, but we are not
+    // equipped to deal with that. So assert that there is only one.
+    //
+    Status = FdtClient->FindNextCompatibleNode (FdtClient,
+                          "pci-host-ecam-generic", Node, &Tmp);
+    ASSERT (Status == EFI_NOT_FOUND);
+  );
+
+  Status = FdtClient->GetNodeProperty (FdtClient, Node, "reg", &Prop, &Len);
+  if (EFI_ERROR (Status) || Len != 2 * sizeof (UINT64)) {
+    DEBUG ((EFI_D_ERROR, "%a: 'reg' property not found or invalid\n",
+      __FUNCTION__));
+    return EFI_PROTOCOL_ERROR;
+  }
+
+  //
+  // Fetch the ECAM window.
+  //
+  ConfigBase = SwapBytes64 (((CONST UINT64 *)Prop)[0]);
+  ConfigSize = SwapBytes64 (((CONST UINT64 *)Prop)[1]);
+
+  //
+  // Fetch the bus range (note: inclusive).
+  //
+  Status = FdtClient->GetNodeProperty (FdtClient, Node, "bus-range", &Prop,
+                        &Len);
+  if (EFI_ERROR (Status) || Len != 2 * sizeof (UINT32)) {
+    DEBUG ((EFI_D_ERROR, "%a: 'bus-range' not found or invalid\n",
+      __FUNCTION__));
+    return EFI_PROTOCOL_ERROR;
+  }
+  *BusMin = SwapBytes32 (((CONST UINT32 *)Prop)[0]);
+  *BusMax = SwapBytes32 (((CONST UINT32 *)Prop)[1]);
+
+  //
+  // Sanity check: the config space must accommodate all 4K register bytes of
+  // all 8 functions of all 32 devices of all buses.
+  //
+  if (*BusMax < *BusMin || *BusMax - *BusMin == MAX_UINT32 ||
+      DivU64x32 (ConfigSize, SIZE_4KB * 8 * 32) < *BusMax - *BusMin + 1) {
+    DEBUG ((EFI_D_ERROR, "%a: invalid 'bus-range' and/or 'reg'\n",
+      __FUNCTION__));
+    return EFI_PROTOCOL_ERROR;
+  }
+
+  //
+  // Iterate over "ranges".
+  //
+  Status = FdtClient->GetNodeProperty (FdtClient, Node, "ranges", &Prop, &Len);
+  if (EFI_ERROR (Status) || Len == 0 ||
+      Len % sizeof (DTB_PCI_HOST_RANGE_RECORD) != 0) {
+    DEBUG ((EFI_D_ERROR, "%a: 'ranges' not found or invalid\n", __FUNCTION__));
+    return EFI_PROTOCOL_ERROR;
+  }
+
+  for (RecordIdx = 0; RecordIdx < Len / sizeof (DTB_PCI_HOST_RANGE_RECORD);
+       ++RecordIdx) {
+    CONST DTB_PCI_HOST_RANGE_RECORD *Record;
+
+    Record = (CONST DTB_PCI_HOST_RANGE_RECORD *)Prop + RecordIdx;
+    switch (SwapBytes32 (Record->Type) & DTB_PCI_HOST_RANGE_TYPEMASK) {
+    case DTB_PCI_HOST_RANGE_IO:
+      *IoBase = SwapBytes64 (Record->ChildBase);
+      *IoSize = SwapBytes64 (Record->Size);
+      IoTranslation = SwapBytes64 (Record->CpuBase) - *IoBase;
+
+      ASSERT (PcdGet64 (PcdPciIoTranslation) == IoTranslation);
+      break;
+
+    case DTB_PCI_HOST_RANGE_MMIO32:
+      *MmioBase = SwapBytes64 (Record->ChildBase);
+      *MmioSize = SwapBytes64 (Record->Size);
+      MmioTranslation = SwapBytes64 (Record->CpuBase) - *MmioBase;
+
+      if (*MmioBase > MAX_UINT32 || *MmioSize > MAX_UINT32 ||
+          *MmioBase + *MmioSize > SIZE_4GB) {
+        DEBUG ((EFI_D_ERROR, "%a: MMIO32 space invalid\n", __FUNCTION__));
+        return EFI_PROTOCOL_ERROR;
+      }
+
+      ASSERT (PcdGet64 (PcdPciMmio32Translation) == MmioTranslation);
+
+      if (MmioTranslation != 0) {
+        DEBUG ((EFI_D_ERROR, "%a: unsupported nonzero MMIO32 translation "
+          "0x%Lx\n", __FUNCTION__, MmioTranslation));
+        return EFI_UNSUPPORTED;
+      }
+
+      break;
+    }
+  }
+  if (*IoSize == 0 || *MmioSize == 0) {
+    DEBUG ((EFI_D_ERROR, "%a: %a space empty\n", __FUNCTION__,
+      (*IoSize == 0) ? "IO" : "MMIO32"));
+    return EFI_PROTOCOL_ERROR;
+  }
+
+  //
+  // The dynamic PCD PcdPciExpressBaseAddress should have already been set,
+  // and should match the value we found in the DT node.
+  //
+  ASSERT (PcdGet64 (PcdPciExpressBaseAddress) == ConfigBase);
+
+  DEBUG ((EFI_D_INFO, "%a: Config[0x%Lx+0x%Lx) Bus[0x%x..0x%x] "
+    "Io[0x%Lx+0x%Lx)@0x%Lx Mem[0x%Lx+0x%Lx)@0x0\n", __FUNCTION__, ConfigBase,
+    ConfigSize, *BusMin, *BusMax, *IoBase, *IoSize, IoTranslation, *MmioBase,
+    *MmioSize));
+  return EFI_SUCCESS;
+}
+
+STATIC PCI_ROOT_BRIDGE mRootBridge;
+
+/**
+  Return all the root bridge instances in an array.
+
+  @param Count  Return the count of root bridge instances.
+
+  @return All the root bridge instances in an array.
+          The array should be passed into PciHostBridgeFreeRootBridges()
+          when it's not used.
+**/
+PCI_ROOT_BRIDGE *
+EFIAPI
+PciHostBridgeGetRootBridges (
+  UINTN *Count
+  )
+{
+  UINT64              IoBase, IoSize;
+  UINT64              Mmio32Base, Mmio32Size;
+  UINT32              BusMin, BusMax;
+  EFI_STATUS          Status;
+
+  if (PcdGet64 (PcdPciExpressBaseAddress) == 0) {
+    DEBUG ((EFI_D_INFO, "%a: PCI host bridge not present\n", __FUNCTION__));
+
+    *Count = 0;
+    return NULL;
+  }
+
+  Status = ProcessPciHost (&IoBase, &IoSize, &Mmio32Base, &Mmio32Size, &BusMin,
+             &BusMax);
+  if (EFI_ERROR (Status)) {
+    DEBUG ((EFI_D_ERROR, "%a: failed to discover PCI host bridge: %r\n",
+      __FUNCTION__, Status));
+    *Count = 0;
+    return NULL;
+  }
+
+  *Count = 1;
+
+  mRootBridge.Segment               = 0;
+  mRootBridge.Supports              = EFI_PCI_ATTRIBUTE_ISA_IO_16 |
+                                      EFI_PCI_ATTRIBUTE_ISA_MOTHERBOARD_IO |
+                                      EFI_PCI_ATTRIBUTE_VGA_IO_16  |
+                                      EFI_PCI_ATTRIBUTE_VGA_PALETTE_IO_16;
+  mRootBridge.Attributes            = mRootBridge.Supports;
+
+  mRootBridge.DmaAbove4G            = TRUE;
+  mRootBridge.NoExtendedConfigSpace = FALSE;
+  mRootBridge.ResourceAssigned      = FALSE;
+
+  mRootBridge.AllocationAttributes  = EFI_PCI_HOST_BRIDGE_COMBINE_MEM_PMEM;
+
+  mRootBridge.Bus.Base              = BusMin;
+  mRootBridge.Bus.Limit             = BusMax;
+  mRootBridge.Io.Base               = IoBase;
+  mRootBridge.Io.Limit              = IoBase + IoSize - 1;
+  mRootBridge.Mem.Base              = Mmio32Base;
+  mRootBridge.Mem.Limit             = Mmio32Base + Mmio32Size - 1;
+  mRootBridge.MemAbove4G.Base       = MAX_UINT64;
+  mRootBridge.MemAbove4G.Limit      = 0;
+
+  //
+  // No separate ranges for prefetchable and non-prefetchable BARs
+  //
+  mRootBridge.PMem.Base             = MAX_UINT64;
+  mRootBridge.PMem.Limit            = 0;
+  mRootBridge.PMemAbove4G.Base      = MAX_UINT64;
+  mRootBridge.PMemAbove4G.Limit     = 0;
+
+  mRootBridge.DevicePath = (EFI_DEVICE_PATH_PROTOCOL *)&mEfiPciRootBridgeDevicePath;
+
+  return &mRootBridge;
+}
+
+/**
+  Free the root bridge instances array returned from
+  PciHostBridgeGetRootBridges().
+
+  @param Bridges The root bridge instances array.
+  @param Count   The count of the array.
+**/
+VOID
+EFIAPI
+PciHostBridgeFreeRootBridges (
+  PCI_ROOT_BRIDGE *Bridges,
+  UINTN           Count
+  )
+{
+  ASSERT (Count == 1);
+}
+
+/**
+  Inform the platform that the resource conflict happens.
+
+  @param HostBridgeHandle Handle of the Host Bridge.
+  @param Configuration    Pointer to PCI I/O and PCI memory resource
+                          descriptors. The Configuration contains the resources
+                          for all the root bridges. The resource for each root
+                          bridge is terminated with END descriptor and an
+                          additional END is appended indicating the end of the
+                          entire resources. The resource descriptor field
+                          values follow the description in
+                          EFI_PCI_HOST_BRIDGE_RESOURCE_ALLOCATION_PROTOCOL
+                          .SubmitResources().
+**/
+VOID
+EFIAPI
+PciHostBridgeResourceConflict (
+  EFI_HANDLE                        HostBridgeHandle,
+  VOID                              *Configuration
+  )
+{
+  EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *Descriptor;
+  UINTN                             RootBridgeIndex;
+  DEBUG ((EFI_D_ERROR, "PciHostBridge: Resource conflict happens!\n"));
+
+  RootBridgeIndex = 0;
+  Descriptor = (EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *) Configuration;
+  while (Descriptor->Desc == ACPI_ADDRESS_SPACE_DESCRIPTOR) {
+    DEBUG ((EFI_D_ERROR, "RootBridge[%d]:\n", RootBridgeIndex++));
+    for (; Descriptor->Desc == ACPI_ADDRESS_SPACE_DESCRIPTOR; Descriptor++) {
+      ASSERT (Descriptor->ResType <
+              (sizeof (mPciHostBridgeLibAcpiAddressSpaceTypeStr) /
+               sizeof (mPciHostBridgeLibAcpiAddressSpaceTypeStr[0])
+               )
+              );
+      DEBUG ((EFI_D_ERROR, " %s: Length/Alignment = 0x%lx / 0x%lx\n",
+              mPciHostBridgeLibAcpiAddressSpaceTypeStr[Descriptor->ResType],
+              Descriptor->AddrLen, Descriptor->AddrRangeMax
+              ));
+      if (Descriptor->ResType == ACPI_ADDRESS_SPACE_TYPE_MEM) {
+        DEBUG ((EFI_D_ERROR, "     Granularity/SpecificFlag = %ld / %02x%s\n",
+                Descriptor->AddrSpaceGranularity, Descriptor->SpecificFlag,
+                ((Descriptor->SpecificFlag &
+                  EFI_ACPI_MEMORY_RESOURCE_SPECIFIC_FLAG_CACHEABLE_PREFETCHABLE
+                  ) != 0) ? L" (Prefetchable)" : L""
+                ));
+      }
+    }
+    //
+    // Skip the END descriptor for root bridge
+    //
+    ASSERT (Descriptor->Desc == ACPI_END_TAG_DESCRIPTOR);
+    Descriptor = (EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *)(
+                   (EFI_ACPI_END_TAG_DESCRIPTOR *)Descriptor + 1
+                   );
+  }
+}
diff --git a/ArmVirtPkg/Library/FdtPciHostBridgeLib/FdtPciHostBridgeLib.inf b/ArmVirtPkg/Library/FdtPciHostBridgeLib/FdtPciHostBridgeLib.inf
new file mode 100644
index 000000000000..fc1d37fb3c23
--- /dev/null
+++ b/ArmVirtPkg/Library/FdtPciHostBridgeLib/FdtPciHostBridgeLib.inf
@@ -0,0 +1,56 @@
+## @file
+#  PCI Host Bridge Library instance for pci-ecam-generic DT nodes
+#
+#  Copyright (c) 2016, Linaro Ltd. 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
+#  distribution. The full text of the license may be found at
+#  http://opensource.org/licenses/bsd-license.php.
+#
+#  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR
+#  IMPLIED.
+#
+#
+##
+
+[Defines]
+  INF_VERSION                    = 0x00010005
+  BASE_NAME                      = FdtPciHostBridgeLib
+  FILE_GUID                      = 59fcb139-2558-4cf0-8d7c-ebac499da727
+  MODULE_TYPE                    = DXE_DRIVER
+  VERSION_STRING                 = 1.0
+  LIBRARY_CLASS                  = PciHostBridgeLib
+
+#
+# The following information is for reference only and not required by the build
+# tools.
+#
+#  VALID_ARCHITECTURES           = AARCH64 ARM
+#
+
+[Sources]
+  FdtPciHostBridgeLib.c
+
+[Packages]
+  ArmPkg/ArmPkg.dec
+  ArmVirtPkg/ArmVirtPkg.dec
+  MdeModulePkg/MdeModulePkg.dec
+  MdePkg/MdePkg.dec
+
+[LibraryClasses]
+  DebugLib
+  DevicePathLib
+  MemoryAllocationLib
+  PciPcdProducerLib
+
+[FixedPcd]
+  gArmTokenSpaceGuid.PcdPciMmio32Translation
+
+[Pcd]
+  gArmTokenSpaceGuid.PcdPciIoTranslation
+  gEfiMdePkgTokenSpaceGuid.PcdPciExpressBaseAddress
+
+[Depex]
+  gFdtClientProtocolGuid
-- 
2.7.4