diff options
| author | Ruiyu Ni <ruiyu.ni@intel.com> | 2017-10-31 15:53:18 +0800 |
|---|---|---|
| committer | Ruiyu Ni <ruiyu.ni@intel.com> | 2017-11-07 11:23:41 +0800 |
| commit | 050763db0730a0bb46235cec87e3716632dc532c (patch) | |
| tree | 47925b5a3fde2304f319057e07cfc89d6e8d5c7d | |
| parent | 3d34e92faba409a6c6629ce4c1373181879f5e52 (diff) | |
| download | edk2-050763db0730a0bb46235cec87e3716632dc532c.tar.gz edk2-050763db0730a0bb46235cec87e3716632dc532c.tar.bz2 edk2-050763db0730a0bb46235cec87e3716632dc532c.zip | |
MdeModulePkg/PciBus: Disable BME of all devices when entering RT
The patch ensures all DMA transactions are blocked after
ExitBootService.
If a platform enables IOMMU before and needs disable IOMMU after
ExitBootService, the IOMMU should be disabled after PCI bus driver
disables BME.
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Michael Turner <michael.turner@microsoft.com>
Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
Cc: Jeff Fan <vanjeff_919@hotmail.com>
| -rw-r--r-- | MdeModulePkg/Bus/Pci/PciBusDxe/PciBus.h | 2 | ||||
| -rw-r--r-- | MdeModulePkg/Bus/Pci/PciBusDxe/PciBusDxe.inf | 3 | ||||
| -rw-r--r-- | MdeModulePkg/Bus/Pci/PciBusDxe/PciDeviceSupport.c | 86 |
3 files changed, 91 insertions, 0 deletions
diff --git a/MdeModulePkg/Bus/Pci/PciBusDxe/PciBus.h b/MdeModulePkg/Bus/Pci/PciBusDxe/PciBus.h index 55eb3a5a80..79b5b71082 100644 --- a/MdeModulePkg/Bus/Pci/PciBusDxe/PciBus.h +++ b/MdeModulePkg/Bus/Pci/PciBusDxe/PciBus.h @@ -18,6 +18,8 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. #include <PiDxe.h>
+#include <Guid/EventGroup.h>
+
#include <Protocol/LoadedImage.h>
#include <Protocol/PciHostBridgeResourceAllocation.h>
#include <Protocol/PciIo.h>
diff --git a/MdeModulePkg/Bus/Pci/PciBusDxe/PciBusDxe.inf b/MdeModulePkg/Bus/Pci/PciBusDxe/PciBusDxe.inf index 97608bfcf2..d5b8fab3ca 100644 --- a/MdeModulePkg/Bus/Pci/PciBusDxe/PciBusDxe.inf +++ b/MdeModulePkg/Bus/Pci/PciBusDxe/PciBusDxe.inf @@ -80,6 +80,9 @@ DebugLib
PeCoffLib
+[Guids]
+ gEfiEventExitBootServicesGuid ## SOMETIMES_CONSUMES ## Event
+
[Protocols]
gEfiPciHotPlugRequestProtocolGuid ## SOMETIMES_PRODUCES
gEfiPciIoProtocolGuid ## BY_START
diff --git a/MdeModulePkg/Bus/Pci/PciBusDxe/PciDeviceSupport.c b/MdeModulePkg/Bus/Pci/PciBusDxe/PciDeviceSupport.c index 97bb971a59..004f2a3b5b 100644 --- a/MdeModulePkg/Bus/Pci/PciBusDxe/PciDeviceSupport.c +++ b/MdeModulePkg/Bus/Pci/PciBusDxe/PciDeviceSupport.c @@ -21,6 +21,72 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. LIST_ENTRY mPciDevicePool;
/**
+ Disable Bus Master Enable bit in all devices in the list.
+
+ @param Devices A device list.
+**/
+VOID
+DisableBmeOnTree (
+ IN LIST_ENTRY *Devices
+ )
+{
+ LIST_ENTRY *Link;
+ PCI_IO_DEVICE *PciIoDevice;
+ UINT16 Command;
+
+ for ( Link = GetFirstNode (Devices)
+ ; !IsNull (Devices, Link)
+ ; Link = GetNextNode (Devices, Link)
+ ) {
+ PciIoDevice = PCI_IO_DEVICE_FROM_LINK (Link);
+ //
+ // Turn off all children's Bus Master, if any
+ //
+ DisableBmeOnTree (&PciIoDevice->ChildList);
+
+ //
+ // If this is a device that supports BME, disable BME on this device.
+ //
+ if ((PciIoDevice->Supports & EFI_PCI_IO_ATTRIBUTE_BUS_MASTER) != 0) {
+ PCI_READ_COMMAND_REGISTER(PciIoDevice, &Command);
+ if ((Command & EFI_PCI_COMMAND_BUS_MASTER) != 0) {
+ Command &= ~EFI_PCI_COMMAND_BUS_MASTER;
+ PCI_SET_COMMAND_REGISTER (PciIoDevice, Command);
+ DEBUG ((
+ DEBUG_INFO," %02x %02x %02x %04x\n",
+ PciIoDevice->BusNumber, PciIoDevice->DeviceNumber, PciIoDevice->FunctionNumber,
+ Command
+ ));
+ }
+ }
+ }
+}
+
+/**
+ Exit Boot Services Event notification handler.
+
+ Disable Bus Master on any that were enabled during BDS.
+
+ @param[in] Event Event whose notification function is being invoked.
+ @param[in] Context Pointer to the notification function's context.
+
+**/
+VOID
+EFIAPI
+OnExitBootServices (
+ IN EFI_EVENT Event,
+ IN VOID *Context
+ )
+{
+ DEBUG ((
+ DEBUG_INFO,
+ "PciBus: Disable Bus Master of all devices...\n"
+ " Bus# Device# Function# NewCommand\n"
+ ));
+ DisableBmeOnTree(&mPciDevicePool);
+}
+
+/**
Initialize the PCI devices pool.
**/
@@ -29,7 +95,27 @@ InitializePciDevicePool ( VOID
)
{
+ EFI_EVENT ExitBootServicesEvent;
+ EFI_STATUS Status;
+
InitializeListHead (&mPciDevicePool);
+
+ //
+ // DisableBME on ExitBootServices should be synchonized with any IOMMU ExitBootServices routine.
+ // DisableBME should be run before the IOMMU protections are disabled.
+ // One way to do this is to ensure that the IOMMU ExitBootServices callback runs at TPL_CALLBACK.
+ //
+ Status = gBS->CreateEventEx (
+ EVT_NOTIFY_SIGNAL,
+ TPL_NOTIFY,
+ OnExitBootServices,
+ NULL,
+ &gEfiEventExitBootServicesGuid,
+ &ExitBootServicesEvent
+ );
+ if (EFI_ERROR (Status)) {
+ DEBUG ((DEBUG_ERROR, "PciBus: Unable to hook ExitBootServices event - %r\n", Status));
+ }
}
/**
|