diff mbox

[edk2,v2,14/24] ArmVirtPkg/PciHostBridgeDxe: move to FDT client protocol

Message ID 1460108711-12122-15-git-send-email-ard.biesheuvel@linaro.org
State New
Headers show

Commit Message

Ard Biesheuvel April 8, 2016, 9:45 a.m. UTC
Instead of relying on VirtFdtDxe to populate various dynamic PCDs with
information retrieved from the host provided device tree, perform the
PCI ECAM related DT node parsing directly in PciHostBridgeDxe.

This means some PCI related PCDs are no longer set, such as PcdPciBusMin,
PcdPciBusMax, PcdPciIoBase, PcdPciIoSize, PcdPciIoTranslation,
PcdPciMmio32Base and PcdPciMmio32Size. Since these PCDs are specific to
ARM (and declared in ArmPlatformPkg), and not used anywhere else by the
ArmVirtPkg platforms, we can simply stop populating them, and drop any
references completely.

As far as PcdPciExpressBaseAddress is concerned, this dynamic PCD is now
set by the DXE entry point, which means any libraries this module uses can
no longer depend on its value in their constructor. This has already been
addressed in a preceding patch.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>

---
 ArmVirtPkg/PciHostBridgeDxe/PciHostBridge.c      | 234 ++++++++++++++++++--
 ArmVirtPkg/PciHostBridgeDxe/PciHostBridge.h      |   1 +
 ArmVirtPkg/PciHostBridgeDxe/PciHostBridgeDxe.inf |  14 +-
 3 files changed, 225 insertions(+), 24 deletions(-)

-- 
2.5.0

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diff mbox

Patch

diff --git a/ArmVirtPkg/PciHostBridgeDxe/PciHostBridge.c b/ArmVirtPkg/PciHostBridgeDxe/PciHostBridge.c
index 735c7f216318..9019cd994ec5 100644
--- a/ArmVirtPkg/PciHostBridgeDxe/PciHostBridge.c
+++ b/ArmVirtPkg/PciHostBridgeDxe/PciHostBridge.c
@@ -79,6 +79,197 @@  PCI_HOST_BRIDGE_INSTANCE mPciHostBridgeInstanceTemplate = {
 // Implementation
 //
 
+STATIC UINT64     mIoBase, mIoSize, mIoTranslation;
+STATIC UINT64     mMmioBase, mMmioSize, mMmioTranslation;
+STATIC UINT32     mBusMin, mBusMax;
+
+//
+// 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)
+
+/**
+  Process the device tree node describing the generic PCI host controller.
+
+  param[in] FdtClient       Pointer to the FDT client protocol
+
+  param[in] Node            Offset of the device tree node whose "compatible"
+                            property is "pci-host-ecam-generic".
+
+  @retval EFI_SUCCESS         Parsing successful, properties parsed from Node
+                              have been stored in dynamic PCDs.
+
+  @retval EFI_PROTOCOL_ERROR  Parsing failed. PCDs are left unchanged.
+**/
+STATIC
+EFI_STATUS
+EFIAPI
+ProcessPciHost (
+  FDT_CLIENT_PROTOCOL         *FdtClient,
+  IN INT32                    Node
+  )
+{
+  UINT64     ConfigBase, ConfigSize;
+  CONST VOID *Prop;
+  UINT32     Len;
+  UINT32     RecordIdx;
+  EFI_STATUS Status;
+  UINT32     Tmp;
+
+  Status = FdtClient->GetNodeProperty (FdtClient, Node, "reg", &Prop, &Len);
+  if (EFI_ERROR (Status) || Prop == NULL || 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) || Prop == NULL || Len != 2 * sizeof(UINT32)) {
+    DEBUG ((EFI_D_ERROR, "%a: 'bus-range' not found or invalid\n",
+      __FUNCTION__));
+    return EFI_PROTOCOL_ERROR;
+  }
+  mBusMin = SwapBytes32 (((CONST UINT32 *)Prop)[0]);
+  mBusMax = 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 (mBusMax < mBusMin || mBusMax - mBusMin == MAX_UINT32 ||
+      DivU64x32 (ConfigSize, SIZE_4KB * 8 * 32) < mBusMax - mBusMin + 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) || Prop == NULL || 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;
+  }
+
+  //
+  // mIoBase, IoTranslation, mMmioBase and MmioTranslation are initialized only
+  // in order to suppress '-Werror=maybe-uninitialized' warnings *incorrectly*
+  // emitted by some gcc versions.
+  //
+  mIoBase = 0;
+  mIoTranslation = 0;
+  mMmioBase = 0;
+  mMmioTranslation = 0;
+
+  //
+  // IoSize and MmioSize are initialized to zero because the logic below
+  // requires it.
+  //
+  mIoSize = 0;
+  mMmioSize = 0;
+  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:
+      mIoBase = SwapBytes64 (Record->ChildBase);
+      mIoSize = SwapBytes64 (Record->Size);
+      mIoTranslation = SwapBytes64 (Record->CpuBase) - mIoBase;
+      break;
+
+    case DTB_PCI_HOST_RANGE_MMIO32:
+      mMmioBase = SwapBytes64 (Record->ChildBase);
+      mMmioSize = SwapBytes64 (Record->Size);
+      mMmioTranslation = SwapBytes64 (Record->CpuBase) - mMmioBase;
+
+      if (mMmioBase > MAX_UINT32 || mMmioSize > MAX_UINT32 ||
+          mMmioBase + mMmioSize > SIZE_4GB) {
+        DEBUG ((EFI_D_ERROR, "%a: MMIO32 space invalid\n", __FUNCTION__));
+        return EFI_PROTOCOL_ERROR;
+      }
+
+      if (mMmioTranslation != 0) {
+        DEBUG ((EFI_D_ERROR, "%a: unsupported nonzero MMIO32 translation "
+          "0x%Lx\n", __FUNCTION__, mMmioTranslation));
+        return EFI_UNSUPPORTED;
+      }
+
+      break;
+    }
+  }
+  if (mIoSize == 0 || mMmioSize == 0) {
+    DEBUG ((EFI_D_ERROR, "%a: %a space empty\n", __FUNCTION__,
+      (mIoSize == 0) ? "IO" : "MMIO32"));
+    return EFI_PROTOCOL_ERROR;
+  }
+
+  PcdSet64 (PcdPciExpressBaseAddress, ConfigBase);
+
+  PcdSetBool (PcdPciDisableBusEnumeration, FALSE);
+
+  if (!FeaturePcdGet (PcdPureAcpiBoot)) {
+    //
+    // Set the /chosen/linux,pci-probe-only property to 1, so that the PCI
+    // setup we will perform in the firmware is honored by the Linux OS,
+    // rather than torn down and done from scratch. This is generally a more
+    // sensible approach, and aligns with what ACPI based OSes do in general.
+    //
+    // In case we are exposing an emulated VGA PCI device to the guest, which
+    // may subsequently get exposed via the Graphics Output protocol and
+    // driven as an efifb by Linux, we need this setting to prevent the
+    // framebuffer from becoming unresponsive.
+    //
+    Status = FdtClient->GetOrInsertChosenNode (FdtClient, &Node);
+
+    if (Status == EFI_SUCCESS) {
+      Tmp = SwapBytes32 (1);
+      Status = FdtClient->SetNodeProperty (FdtClient, Node,
+                            "linux,pci-probe-only", &Tmp, sizeof (Tmp));
+    }
+    if (EFI_ERROR (Status)) {
+      DEBUG ((EFI_D_WARN,
+        "Failed to set /chosen/linux,pci-probe-only property\n"));
+    }
+  }
+
+  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)@0x%Lx\n", __FUNCTION__, ConfigBase,
+    ConfigSize, mBusMin, mBusMax, mIoBase, mIoSize, mIoTranslation, mMmioBase,
+    mMmioSize, mMmioTranslation));
+  return EFI_SUCCESS;
+}
+
+
 /**
   Entry point of this driver
 
@@ -97,6 +288,8 @@  InitializePciHostBridge (
   IN EFI_SYSTEM_TABLE  *SystemTable
   )
 {
+  FDT_CLIENT_PROTOCOL         *FdtClient;
+  INT32                       PciDtNode;
   UINT64                      MmioAttributes;
   EFI_STATUS                  Status;
   UINTN                       Loop1;
@@ -104,24 +297,33 @@  InitializePciHostBridge (
   PCI_HOST_BRIDGE_INSTANCE    *HostBridge;
   PCI_ROOT_BRIDGE_INSTANCE    *PrivateData;
 
-  if (PcdGet64 (PcdPciExpressBaseAddress) == 0) {
+  Status = gBS->LocateProtocol (&gFdtClientProtocolGuid, NULL,
+                  (VOID **)&FdtClient);
+  ASSERT_EFI_ERROR (Status);
+
+  Status = FdtClient->FindCompatibleNode (FdtClient, "pci-host-ecam-generic",
+                        &PciDtNode);
+  if (EFI_ERROR (Status)) {
     DEBUG ((EFI_D_INFO, "%a: PCI host bridge not present\n", __FUNCTION__));
     return EFI_ABORTED;
   }
 
+  Status = ProcessPciHost (FdtClient, PciDtNode);
+  if (EFI_ERROR (Status)) {
+    return EFI_ABORTED;
+  }
+
   mDriverImageHandle = ImageHandle;
 
-  mResAperture[0][0].BusBase  = PcdGet32 (PcdPciBusMin);
-  mResAperture[0][0].BusLimit = PcdGet32 (PcdPciBusMax);
+  mResAperture[0][0].BusBase  = mBusMin;
+  mResAperture[0][0].BusLimit = mBusMax;
 
-  mResAperture[0][0].MemBase  = PcdGet32 (PcdPciMmio32Base);
-  mResAperture[0][0].MemLimit = (UINT64)PcdGet32 (PcdPciMmio32Base) +
-                                PcdGet32 (PcdPciMmio32Size) - 1;
+  mResAperture[0][0].MemBase  = mMmioBase;
+  mResAperture[0][0].MemLimit = (UINT64)mMmioBase + mMmioSize - 1;
 
-  mResAperture[0][0].IoBase        = PcdGet64 (PcdPciIoBase);
-  mResAperture[0][0].IoLimit       = PcdGet64 (PcdPciIoBase) +
-                                     PcdGet64 (PcdPciIoSize) - 1;
-  mResAperture[0][0].IoTranslation = PcdGet64 (PcdPciIoTranslation);
+  mResAperture[0][0].IoBase        = mIoBase;
+  mResAperture[0][0].IoLimit       = mIoBase + mIoSize - 1;
+  mResAperture[0][0].IoTranslation = mIoTranslation;
 
   //
   // Add IO and MMIO memory space, so that resources can be allocated in the
@@ -129,8 +331,8 @@  InitializePciHostBridge (
   //
   Status = gDS->AddIoSpace (
                   EfiGcdIoTypeIo,
-                  PcdGet64 (PcdPciIoBase),
-                  PcdGet64 (PcdPciIoSize)
+                  mIoBase,
+                  mIoSize
                   );
   ASSERT_EFI_ERROR (Status);
 
@@ -139,8 +341,8 @@  InitializePciHostBridge (
 
   Status = gDS->AddMemorySpace (
                   EfiGcdMemoryTypeMemoryMappedIo,
-                  PcdGet32 (PcdPciMmio32Base),
-                  PcdGet32 (PcdPciMmio32Size),
+                  mMmioBase,
+                  mMmioSize,
                   MmioAttributes
                   );
   if (EFI_ERROR (Status)) {
@@ -149,8 +351,8 @@  InitializePciHostBridge (
   }
 
   Status = gDS->SetMemorySpaceAttributes (
-                  PcdGet32 (PcdPciMmio32Base),
-                  PcdGet32 (PcdPciMmio32Size),
+                  mMmioBase,
+                  mMmioSize,
                   MmioAttributes
                   );
   if (EFI_ERROR (Status)) {
diff --git a/ArmVirtPkg/PciHostBridgeDxe/PciHostBridge.h b/ArmVirtPkg/PciHostBridgeDxe/PciHostBridge.h
index 8161b546ff87..647fe1a52a7d 100644
--- a/ArmVirtPkg/PciHostBridgeDxe/PciHostBridge.h
+++ b/ArmVirtPkg/PciHostBridgeDxe/PciHostBridge.h
@@ -24,6 +24,7 @@ 
 #include <Protocol/PciRootBridgeIo.h>
 #include <Protocol/Metronome.h>
 #include <Protocol/DevicePath.h>
+#include <Protocol/FdtClient.h>
 
 
 #include <Library/BaseLib.h>
diff --git a/ArmVirtPkg/PciHostBridgeDxe/PciHostBridgeDxe.inf b/ArmVirtPkg/PciHostBridgeDxe/PciHostBridgeDxe.inf
index 6d782582e02d..032cbeda44bc 100644
--- a/ArmVirtPkg/PciHostBridgeDxe/PciHostBridgeDxe.inf
+++ b/ArmVirtPkg/PciHostBridgeDxe/PciHostBridgeDxe.inf
@@ -22,6 +22,7 @@  [Defines]
   ENTRY_POINT                    = InitializePciHostBridge
 
 [Packages]
+  MdeModulePkg/MdeModulePkg.dec
   MdePkg/MdePkg.dec
   ArmPlatformPkg/ArmPlatformPkg.dec
   ArmVirtPkg/ArmVirtPkg.dec
@@ -50,20 +51,17 @@  [Protocols]
   gEfiPciRootBridgeIoProtocolGuid                       ## PRODUCES
   gEfiMetronomeArchProtocolGuid                         ## CONSUMES
   gEfiDevicePathProtocolGuid                            ## PRODUCES
+  gFdtClientProtocolGuid                                ## CONSUMES
 
 [Pcd]
-  gArmPlatformTokenSpaceGuid.PcdPciBusMin
-  gArmPlatformTokenSpaceGuid.PcdPciBusMax
-  gArmPlatformTokenSpaceGuid.PcdPciIoBase
-  gArmPlatformTokenSpaceGuid.PcdPciIoSize
-  gArmPlatformTokenSpaceGuid.PcdPciIoTranslation
-  gArmPlatformTokenSpaceGuid.PcdPciMmio32Base
-  gArmPlatformTokenSpaceGuid.PcdPciMmio32Size
+  gEfiMdeModulePkgTokenSpaceGuid.PcdPciDisableBusEnumeration
   gEfiMdePkgTokenSpaceGuid.PcdPciExpressBaseAddress
 
 [FeaturePcd]
   gArmVirtTokenSpaceGuid.PcdKludgeMapPciMmioAsCached
+  gArmVirtTokenSpaceGuid.PcdPureAcpiBoot
 
 [depex]
   gEfiMetronomeArchProtocolGuid AND
-  gEfiCpuArchProtocolGuid
+  gEfiCpuArchProtocolGuid AND
+  gFdtClientProtocolGuid