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485 lines
12 KiB
C
485 lines
12 KiB
C
/** @file
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PCI Hot Plug support functions implementation for PCI Bus module..
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Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include "PciBus.h"
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EFI_PCI_HOT_PLUG_INIT_PROTOCOL *gPciHotPlugInit = NULL;
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EFI_HPC_LOCATION *gPciRootHpcPool = NULL;
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UINTN gPciRootHpcCount = 0;
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ROOT_HPC_DATA *gPciRootHpcData = NULL;
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/**
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Event notification function to set Hot Plug controller status.
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@param Event The event that invoke this function.
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@param Context The calling context, pointer to ROOT_HPC_DATA.
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**/
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VOID
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EFIAPI
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PciHPCInitialized (
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IN EFI_EVENT Event,
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IN VOID *Context
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)
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{
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ROOT_HPC_DATA *HpcData;
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HpcData = (ROOT_HPC_DATA *) Context;
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HpcData->Initialized = TRUE;
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}
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/**
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Compare two device paths to check if they are exactly same.
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@param DevicePath1 A pointer to the first device path data structure.
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@param DevicePath2 A pointer to the second device path data structure.
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@retval TRUE They are same.
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@retval FALSE They are not same.
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**/
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BOOLEAN
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EfiCompareDevicePath (
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IN EFI_DEVICE_PATH_PROTOCOL *DevicePath1,
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IN EFI_DEVICE_PATH_PROTOCOL *DevicePath2
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)
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{
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UINTN Size1;
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UINTN Size2;
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Size1 = GetDevicePathSize (DevicePath1);
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Size2 = GetDevicePathSize (DevicePath2);
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if (Size1 != Size2) {
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return FALSE;
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}
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if (CompareMem (DevicePath1, DevicePath2, Size1) != 0) {
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return FALSE;
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}
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return TRUE;
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}
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/**
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Check hot plug support and initialize root hot plug private data.
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If Hot Plug is supported by the platform, call PCI Hot Plug Init protocol
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to get PCI Hot Plug controller's information and constructor the root hot plug
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private data structure.
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@retval EFI_SUCCESS They are same.
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@retval EFI_UNSUPPORTED No PCI Hot Plug controller on the platform.
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@retval EFI_OUT_OF_RESOURCES No memory to constructor root hot plug private
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data structure.
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**/
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EFI_STATUS
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InitializeHotPlugSupport (
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VOID
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)
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{
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EFI_STATUS Status;
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EFI_HPC_LOCATION *HpcList;
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UINTN HpcCount;
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//
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// Locate the PciHotPlugInit Protocol
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// If it doesn't exist, that means there is no
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// hot plug controller supported on the platform
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// the PCI Bus driver is running on. HotPlug Support
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// is an optional feature, so absence of the protocol
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// won't incur the penalty.
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//
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Status = gBS->LocateProtocol (
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&gEfiPciHotPlugInitProtocolGuid,
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NULL,
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(VOID **) &gPciHotPlugInit
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);
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if (EFI_ERROR (Status)) {
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return EFI_UNSUPPORTED;
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}
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Status = gPciHotPlugInit->GetRootHpcList (
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gPciHotPlugInit,
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&HpcCount,
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&HpcList
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);
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if (!EFI_ERROR (Status)) {
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gPciRootHpcPool = HpcList;
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gPciRootHpcCount = HpcCount;
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gPciRootHpcData = AllocateZeroPool (sizeof (ROOT_HPC_DATA) * gPciRootHpcCount);
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if (gPciRootHpcData == NULL) {
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return EFI_OUT_OF_RESOURCES;
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}
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}
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return EFI_SUCCESS;
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}
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/**
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Test whether device path is for root pci hot plug bus.
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@param HpbDevicePath A pointer to device path data structure to be tested.
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@param HpIndex If HpIndex is not NULL, return the index of root hot
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plug in global array when TRUE is returned.
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@retval TRUE The device path is for root pci hot plug bus.
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@retval FALSE The device path is not for root pci hot plug bus.
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**/
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BOOLEAN
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IsRootPciHotPlugBus (
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IN EFI_DEVICE_PATH_PROTOCOL *HpbDevicePath,
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OUT UINTN *HpIndex OPTIONAL
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)
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{
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UINTN Index;
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for (Index = 0; Index < gPciRootHpcCount; Index++) {
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if (EfiCompareDevicePath (gPciRootHpcPool[Index].HpbDevicePath, HpbDevicePath)) {
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if (HpIndex != NULL) {
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*HpIndex = Index;
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}
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return TRUE;
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}
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}
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return FALSE;
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}
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/**
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Test whether device path is for root pci hot plug controller.
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@param HpcDevicePath A pointer to device path data structure to be tested.
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@param HpIndex If HpIndex is not NULL, return the index of root hot
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plug in global array when TRUE is returned.
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@retval TRUE The device path is for root pci hot plug controller.
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@retval FALSE The device path is not for root pci hot plug controller.
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**/
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BOOLEAN
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IsRootPciHotPlugController (
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IN EFI_DEVICE_PATH_PROTOCOL *HpcDevicePath,
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OUT UINTN *HpIndex
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)
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{
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UINTN Index;
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for (Index = 0; Index < gPciRootHpcCount; Index++) {
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if (EfiCompareDevicePath (gPciRootHpcPool[Index].HpcDevicePath, HpcDevicePath)) {
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if (HpIndex != NULL) {
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*HpIndex = Index;
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}
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return TRUE;
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}
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}
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return FALSE;
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}
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/**
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Creating event object for PCI Hot Plug controller.
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@param HpIndex Index of hot plug device in global array.
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@param Event The returned event that invoke this function.
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@return Status of create event.
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**/
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EFI_STATUS
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CreateEventForHpc (
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IN UINTN HpIndex,
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OUT EFI_EVENT *Event
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)
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{
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EFI_STATUS Status;
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Status = gBS->CreateEvent (
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EVT_NOTIFY_SIGNAL,
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TPL_CALLBACK,
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PciHPCInitialized,
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gPciRootHpcData + HpIndex,
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&((gPciRootHpcData + HpIndex)->Event)
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);
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if (!EFI_ERROR (Status)) {
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*Event = (gPciRootHpcData + HpIndex)->Event;
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}
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return Status;
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}
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/**
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Wait for all root PCI Hot Plug controller finished initializing.
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@param TimeoutInMicroSeconds Microseconds to wait for all root HPCs' initialization.
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@retval EFI_SUCCESS All HPCs initialization finished.
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@retval EFI_TIMEOUT Not ALL HPCs initialization finished in Microseconds.
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**/
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EFI_STATUS
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AllRootHPCInitialized (
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IN UINTN TimeoutInMicroSeconds
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)
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{
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UINT32 Delay;
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UINTN Index;
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Delay = (UINT32) ((TimeoutInMicroSeconds / 30) + 1);
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do {
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for (Index = 0; Index < gPciRootHpcCount; Index++) {
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if (gPciRootHpcData[Index].Found && !gPciRootHpcData[Index].Initialized) {
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break;
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}
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}
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if (Index == gPciRootHpcCount) {
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return EFI_SUCCESS;
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}
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//
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// Stall for 30 microseconds..
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//
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gBS->Stall (30);
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Delay--;
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} while (Delay > 0);
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return EFI_TIMEOUT;
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}
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/**
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Check whether PCI-PCI bridge has PCI Hot Plug capability register block.
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@param PciIoDevice A Pointer to the PCI-PCI bridge.
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@retval TRUE PCI device is HPC.
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@retval FALSE PCI device is not HPC.
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**/
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BOOLEAN
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IsSHPC (
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IN PCI_IO_DEVICE *PciIoDevice
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)
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{
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EFI_STATUS Status;
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UINT8 Offset;
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if (PciIoDevice == NULL) {
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return FALSE;
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}
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Offset = 0;
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Status = LocateCapabilityRegBlock (
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PciIoDevice,
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EFI_PCI_CAPABILITY_ID_SHPC,
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&Offset,
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NULL
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);
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//
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// If the PCI-PCI bridge has the hot plug controller build-in,
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// then return TRUE;
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//
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if (!EFI_ERROR (Status)) {
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return TRUE;
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}
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return FALSE;
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}
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/**
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Check whether PciIoDevice supports PCIe hotplug.
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This is equivalent to the following condition:
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- the device is either a PCIe switch downstream port or a root port,
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- and the device has the SlotImplemented bit set in its PCIe capability
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register,
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- and the device has the HotPlugCapable bit set in its slot capabilities
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register.
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@param[in] PciIoDevice The device being checked.
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@retval TRUE PciIoDevice is a PCIe port that accepts a hot-plugged device.
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@retval FALSE Otherwise.
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**/
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BOOLEAN
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SupportsPcieHotplug (
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IN PCI_IO_DEVICE *PciIoDevice
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)
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{
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UINT32 Offset;
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EFI_STATUS Status;
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PCI_REG_PCIE_CAPABILITY Capability;
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PCI_REG_PCIE_SLOT_CAPABILITY SlotCapability;
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if (PciIoDevice == NULL) {
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return FALSE;
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}
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//
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// Read the PCI Express Capabilities Register
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//
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if (!PciIoDevice->IsPciExp) {
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return FALSE;
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}
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Offset = PciIoDevice->PciExpressCapabilityOffset +
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OFFSET_OF (PCI_CAPABILITY_PCIEXP, Capability);
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Status = PciIoDevice->PciIo.Pci.Read (
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&PciIoDevice->PciIo,
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EfiPciIoWidthUint16,
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Offset,
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1,
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&Capability
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);
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if (EFI_ERROR (Status)) {
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return FALSE;
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}
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//
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// Check the contents of the register
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//
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switch (Capability.Bits.DevicePortType) {
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case PCIE_DEVICE_PORT_TYPE_ROOT_PORT:
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case PCIE_DEVICE_PORT_TYPE_DOWNSTREAM_PORT:
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break;
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default:
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return FALSE;
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}
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if (!Capability.Bits.SlotImplemented) {
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return FALSE;
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}
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//
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// Read the Slot Capabilities Register
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//
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Offset = PciIoDevice->PciExpressCapabilityOffset +
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OFFSET_OF (PCI_CAPABILITY_PCIEXP, SlotCapability);
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Status = PciIoDevice->PciIo.Pci.Read (
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&PciIoDevice->PciIo,
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EfiPciIoWidthUint32,
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Offset,
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1,
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&SlotCapability
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);
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if (EFI_ERROR (Status)) {
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return FALSE;
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}
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//
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// Check the contents of the register
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//
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if (SlotCapability.Bits.HotPlugCapable) {
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return TRUE;
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}
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return FALSE;
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}
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/**
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Get resource padding if the specified PCI bridge is a hot plug bus.
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@param PciIoDevice PCI bridge instance.
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**/
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VOID
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GetResourcePaddingForHpb (
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IN PCI_IO_DEVICE *PciIoDevice
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)
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{
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EFI_STATUS Status;
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EFI_HPC_STATE State;
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UINT64 PciAddress;
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EFI_HPC_PADDING_ATTRIBUTES Attributes;
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EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *Descriptors;
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if (IsPciHotPlugBus (PciIoDevice)) {
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//
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// If PCI-PCI bridge device is PCI Hot Plug bus.
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//
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PciAddress = EFI_PCI_ADDRESS (PciIoDevice->BusNumber, PciIoDevice->DeviceNumber, PciIoDevice->FunctionNumber, 0);
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Status = gPciHotPlugInit->GetResourcePadding (
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gPciHotPlugInit,
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PciIoDevice->DevicePath,
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PciAddress,
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&State,
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(VOID **) &Descriptors,
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&Attributes
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);
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if (EFI_ERROR (Status)) {
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return;
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}
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if ((State & EFI_HPC_STATE_ENABLED) != 0 && (State & EFI_HPC_STATE_INITIALIZED) != 0) {
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PciIoDevice->ResourcePaddingDescriptors = Descriptors;
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PciIoDevice->PaddingAttributes = Attributes;
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}
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return;
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}
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}
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/**
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Test whether PCI device is hot plug bus.
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@param PciIoDevice PCI device instance.
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@retval TRUE PCI device is a hot plug bus.
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@retval FALSE PCI device is not a hot plug bus.
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**/
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BOOLEAN
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IsPciHotPlugBus (
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PCI_IO_DEVICE *PciIoDevice
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)
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{
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if (IsSHPC (PciIoDevice)) {
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//
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// If the PPB has the hot plug controller build-in,
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// then return TRUE;
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//
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return TRUE;
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}
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if (SupportsPcieHotplug (PciIoDevice)) {
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//
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// If the PPB is a PCIe root complex port or a switch downstream port, and
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// implements a hot-plug capable slot, then also return TRUE.
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//
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return TRUE;
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}
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//
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// Otherwise, see if it is a Root HPC
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//
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if(IsRootPciHotPlugBus (PciIoDevice->DevicePath, NULL)) {
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return TRUE;
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}
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return FALSE;
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}
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