/** @file
PEIM to produce gPeiUsb2HostControllerPpiGuid based on gPeiUsbControllerPpiGuid
which is used to enable recovery function from USB Drivers.

Copyright (c) 2014 - 2016, Intel Corporation. All rights reserved.<BR>
Copyright (C) 2022 Advanced Micro Devices, Inc. All rights reserved.<BR>

SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#include "XhcPeim.h"

/**
  Allocate a block of memory to be used by the buffer pool.

  @param  Pages         How many pages to allocate.

  @return Pointer to the allocated memory block or NULL if failed.

**/
USBHC_MEM_BLOCK *
UsbHcAllocMemBlock (
  IN UINTN  Pages
  )
{
  USBHC_MEM_BLOCK       *Block;
  VOID                  *BufHost;
  VOID                  *Mapping;
  EFI_PHYSICAL_ADDRESS  MappedAddr;
  EFI_STATUS            Status;
  UINTN                 PageNumber;
  EFI_PHYSICAL_ADDRESS  TempPtr;

  PageNumber = EFI_SIZE_TO_PAGES (sizeof (USBHC_MEM_BLOCK));
  Status     = PeiServicesAllocatePages (
                 EfiBootServicesData,
                 PageNumber,
                 &TempPtr
                 );

  if (EFI_ERROR (Status)) {
    return NULL;
  }

  ZeroMem ((VOID *)(UINTN)TempPtr, EFI_PAGES_TO_SIZE (PageNumber));

  //
  // each bit in the bit array represents USBHC_MEM_UNIT
  // bytes of memory in the memory block.
  //
  ASSERT (USBHC_MEM_UNIT * 8 <= EFI_PAGE_SIZE);

  Block          = (USBHC_MEM_BLOCK *)(UINTN)TempPtr;
  Block->BufLen  = EFI_PAGES_TO_SIZE (Pages);
  Block->BitsLen = Block->BufLen / (USBHC_MEM_UNIT * 8);

  PageNumber = EFI_SIZE_TO_PAGES (Block->BitsLen);
  Status     = PeiServicesAllocatePages (
                 EfiBootServicesData,
                 PageNumber,
                 &TempPtr
                 );

  if (EFI_ERROR (Status)) {
    return NULL;
  }

  ZeroMem ((VOID *)(UINTN)TempPtr, EFI_PAGES_TO_SIZE (PageNumber));

  Block->Bits = (UINT8 *)(UINTN)TempPtr;

  Status = IoMmuAllocateBuffer (
             Pages,
             &BufHost,
             &MappedAddr,
             &Mapping
             );
  if (EFI_ERROR (Status)) {
    return NULL;
  }

  ZeroMem ((VOID *)(UINTN)BufHost, EFI_PAGES_TO_SIZE (Pages));

  Block->BufHost = (UINT8 *)(UINTN)BufHost;
  Block->Buf     = (UINT8 *)(UINTN)MappedAddr;
  Block->Mapping = Mapping;
  Block->Next    = NULL;

  return Block;
}

/**
  Free the memory block from the memory pool.

  @param  Pool          The memory pool to free the block from.
  @param  Block         The memory block to free.

**/
VOID
UsbHcFreeMemBlock (
  IN USBHC_MEM_POOL   *Pool,
  IN USBHC_MEM_BLOCK  *Block
  )
{
  ASSERT ((Pool != NULL) && (Block != NULL));

  IoMmuFreeBuffer (EFI_SIZE_TO_PAGES (Block->BufLen), Block->BufHost, Block->Mapping);

  //
  // No free memory in PEI.
  //
}

/**
  Alloc some memory from the block.

  @param  Block         The memory block to allocate memory from.
  @param  Units         Number of memory units to allocate.

  @return The pointer to the allocated memory.
          If couldn't allocate the needed memory, the return value is NULL.

**/
VOID *
UsbHcAllocMemFromBlock (
  IN USBHC_MEM_BLOCK  *Block,
  IN UINTN            Units
  )
{
  UINTN  Byte;
  UINT8  Bit;
  UINTN  StartByte;
  UINT8  StartBit;
  UINTN  Available;
  UINTN  Count;

  ASSERT ((Block != 0) && (Units != 0));

  StartByte = 0;
  StartBit  = 0;
  Available = 0;

  for (Byte = 0, Bit = 0; Byte < Block->BitsLen;) {
    //
    // If current bit is zero, the corresponding memory unit is
    // available, otherwise we need to restart our searching.
    // Available counts the consective number of zero bit.
    //
    if (!USB_HC_BIT_IS_SET (Block->Bits[Byte], Bit)) {
      Available++;

      if (Available >= Units) {
        break;
      }

      NEXT_BIT (Byte, Bit);
    } else {
      NEXT_BIT (Byte, Bit);

      Available = 0;
      StartByte = Byte;
      StartBit  = Bit;
    }
  }

  if (Available < Units) {
    return NULL;
  }

  //
  // Mark the memory as allocated
  //
  Byte = StartByte;
  Bit  = StartBit;

  for (Count = 0; Count < Units; Count++) {
    ASSERT (!USB_HC_BIT_IS_SET (Block->Bits[Byte], Bit));

    Block->Bits[Byte] = (UINT8)(Block->Bits[Byte] | (UINT8)USB_HC_BIT (Bit));
    NEXT_BIT (Byte, Bit);
  }

  return Block->BufHost + (StartByte * 8 + StartBit) * USBHC_MEM_UNIT;
}

/**
  Calculate the corresponding pci bus address according to the Mem parameter.

  @param  Pool          The memory pool of the host controller.
  @param  Mem           The pointer to host memory.
  @param  Size          The size of the memory region.
  @param  Alignment     Alignment the size to USBHC_MEM_UNIT bytes.

  @return               The pci memory address

**/
EFI_PHYSICAL_ADDRESS
UsbHcGetPciAddrForHostAddr (
  IN USBHC_MEM_POOL  *Pool,
  IN VOID            *Mem,
  IN UINTN           Size,
  IN BOOLEAN         Alignment
  )
{
  USBHC_MEM_BLOCK       *Head;
  USBHC_MEM_BLOCK       *Block;
  UINTN                 AllocSize;
  EFI_PHYSICAL_ADDRESS  PhyAddr;
  UINTN                 Offset;

  Head = Pool->Head;
  if (Alignment) {
    AllocSize = USBHC_MEM_ROUND (Size);
  } else {
    AllocSize = Size;
  }

  if (Mem == NULL) {
    return 0;
  }

  for (Block = Head; Block != NULL; Block = Block->Next) {
    //
    // scan the memory block list for the memory block that
    // completely contains the allocated memory.
    //
    if ((Block->BufHost <= (UINT8 *)Mem) && (((UINT8 *)Mem + AllocSize) <= (Block->BufHost + Block->BufLen))) {
      break;
    }
  }

  ASSERT ((Block != NULL));
  //
  // calculate the pci memory address for host memory address.
  //
  Offset  = (UINT8 *)Mem - Block->BufHost;
  PhyAddr = (EFI_PHYSICAL_ADDRESS)(UINTN)(Block->Buf + Offset);
  return PhyAddr;
}

/**
  Calculate the corresponding host address according to the pci address.

  @param  Pool          The memory pool of the host controller.
  @param  Mem           The pointer to pci memory.
  @param  Size          The size of the memory region.
  @param  Alignment     Alignment the size to USBHC_MEM_UNIT bytes.

  @return               The host memory address

**/
EFI_PHYSICAL_ADDRESS
UsbHcGetHostAddrForPciAddr (
  IN USBHC_MEM_POOL  *Pool,
  IN VOID            *Mem,
  IN UINTN           Size,
  IN BOOLEAN         Alignment
  )
{
  USBHC_MEM_BLOCK       *Head;
  USBHC_MEM_BLOCK       *Block;
  UINTN                 AllocSize;
  EFI_PHYSICAL_ADDRESS  HostAddr;
  UINTN                 Offset;

  Head = Pool->Head;
  if (Alignment) {
    AllocSize = USBHC_MEM_ROUND (Size);
  } else {
    AllocSize = Size;
  }

  if (Mem == NULL) {
    return 0;
  }

  for (Block = Head; Block != NULL; Block = Block->Next) {
    //
    // scan the memory block list for the memory block that
    // completely contains the allocated memory.
    //
    if ((Block->Buf <= (UINT8 *)Mem) && (((UINT8 *)Mem + AllocSize) <= (Block->Buf + Block->BufLen))) {
      break;
    }
  }

  ASSERT ((Block != NULL));
  //
  // calculate the host memory address for pci memory address.
  //
  Offset   = (UINT8 *)Mem - Block->Buf;
  HostAddr = (EFI_PHYSICAL_ADDRESS)(UINTN)(Block->BufHost + Offset);
  return HostAddr;
}

/**
  Insert the memory block to the pool's list of the blocks.

  @param  Head          The head of the memory pool's block list.
  @param  Block         The memory block to insert.

**/
VOID
UsbHcInsertMemBlockToPool (
  IN USBHC_MEM_BLOCK  *Head,
  IN USBHC_MEM_BLOCK  *Block
  )
{
  ASSERT ((Head != NULL) && (Block != NULL));
  Block->Next = Head->Next;
  Head->Next  = Block;
}

/**
  Is the memory block empty?

  @param  Block         The memory block to check.

  @retval TRUE          The memory block is empty.
  @retval FALSE         The memory block isn't empty.

**/
BOOLEAN
UsbHcIsMemBlockEmpty (
  IN USBHC_MEM_BLOCK  *Block
  )
{
  UINTN  Index;

  for (Index = 0; Index < Block->BitsLen; Index++) {
    if (Block->Bits[Index] != 0) {
      return FALSE;
    }
  }

  return TRUE;
}

/**
  Initialize the memory management pool for the host controller.

  @return Pointer to the allocated memory pool or NULL if failed.

**/
USBHC_MEM_POOL *
UsbHcInitMemPool (
  VOID
  )
{
  USBHC_MEM_POOL        *Pool;
  UINTN                 PageNumber;
  EFI_STATUS            Status;
  EFI_PHYSICAL_ADDRESS  TempPtr;

  PageNumber = EFI_SIZE_TO_PAGES (sizeof (USBHC_MEM_POOL));
  Status     = PeiServicesAllocatePages (
                 EfiBootServicesData,
                 PageNumber,
                 &TempPtr
                 );
  if (EFI_ERROR (Status)) {
    return NULL;
  }

  ZeroMem ((VOID *)(UINTN)TempPtr, EFI_PAGES_TO_SIZE (PageNumber));

  Pool       = (USBHC_MEM_POOL *)((UINTN)TempPtr);
  Pool->Head = UsbHcAllocMemBlock (USBHC_MEM_DEFAULT_PAGES);

  if (Pool->Head == NULL) {
    //
    // No free memory in PEI.
    //
    Pool = NULL;
  }

  return Pool;
}

/**
  Unlink the memory block from the pool's list.

  @param  Head           The block list head of the memory's pool.
  @param  BlockToUnlink  The memory block to unlink.

**/
VOID
UsbHcUnlinkMemBlock (
  IN USBHC_MEM_BLOCK  *Head,
  IN USBHC_MEM_BLOCK  *BlockToUnlink
  )
{
  USBHC_MEM_BLOCK  *Block;

  ASSERT ((Head != NULL) && (BlockToUnlink != NULL));

  for (Block = Head; Block != NULL; Block = Block->Next) {
    if (Block->Next == BlockToUnlink) {
      Block->Next         = BlockToUnlink->Next;
      BlockToUnlink->Next = NULL;
      break;
    }
  }
}

/**
  Release the memory management pool.

  @param  Pool          The USB memory pool to free.

**/
VOID
UsbHcFreeMemPool (
  IN USBHC_MEM_POOL  *Pool
  )
{
  USBHC_MEM_BLOCK  *Block;

  ASSERT (Pool->Head != NULL);

  //
  // Unlink all the memory blocks from the pool, then free them.
  // UsbHcUnlinkMemBlock can't be used to unlink and free the
  // first block.
  //
  for (Block = Pool->Head->Next; Block != NULL; Block = Pool->Head->Next) {
    UsbHcUnlinkMemBlock (Pool->Head, Block);
    UsbHcFreeMemBlock (Pool, Block);
  }

  UsbHcFreeMemBlock (Pool, Pool->Head);
}

/**
  Allocate some memory from the host controller's memory pool
  which can be used to communicate with host controller.

  @param  Pool          The host controller's memory pool.
  @param  Size          Size of the memory to allocate.

  @return The allocated memory or NULL.

**/
VOID *
UsbHcAllocateMem (
  IN USBHC_MEM_POOL  *Pool,
  IN UINTN           Size
  )
{
  USBHC_MEM_BLOCK  *Head;
  USBHC_MEM_BLOCK  *Block;
  USBHC_MEM_BLOCK  *NewBlock;
  VOID             *Mem;
  UINTN            AllocSize;
  UINTN            Pages;

  Mem       = NULL;
  AllocSize = USBHC_MEM_ROUND (Size);
  Head      = Pool->Head;
  ASSERT (Head != NULL);

  //
  // First check whether current memory blocks can satisfy the allocation.
  //
  for (Block = Head; Block != NULL; Block = Block->Next) {
    Mem = UsbHcAllocMemFromBlock (Block, AllocSize / USBHC_MEM_UNIT);

    if (Mem != NULL) {
      ZeroMem (Mem, Size);
      break;
    }
  }

  if (Mem != NULL) {
    return Mem;
  }

  //
  // Create a new memory block if there is not enough memory
  // in the pool. If the allocation size is larger than the
  // default page number, just allocate a large enough memory
  // block. Otherwise allocate default pages.
  //
  if (AllocSize > EFI_PAGES_TO_SIZE (USBHC_MEM_DEFAULT_PAGES)) {
    Pages = EFI_SIZE_TO_PAGES (AllocSize);
  } else {
    Pages = USBHC_MEM_DEFAULT_PAGES;
  }

  NewBlock = UsbHcAllocMemBlock (Pages);

  if (NewBlock == NULL) {
    return NULL;
  }

  //
  // Add the new memory block to the pool, then allocate memory from it
  //
  UsbHcInsertMemBlockToPool (Head, NewBlock);
  Mem = UsbHcAllocMemFromBlock (NewBlock, AllocSize / USBHC_MEM_UNIT);

  if (Mem != NULL) {
    ZeroMem (Mem, Size);
  }

  return Mem;
}

/**
  Free the allocated memory back to the memory pool.

  @param  Pool          The memory pool of the host controller.
  @param  Mem           The memory to free.
  @param  Size          The size of the memory to free.

**/
VOID
UsbHcFreeMem (
  IN USBHC_MEM_POOL  *Pool,
  IN VOID            *Mem,
  IN UINTN           Size
  )
{
  USBHC_MEM_BLOCK  *Head;
  USBHC_MEM_BLOCK  *Block;
  UINT8            *ToFree;
  UINTN            AllocSize;
  UINTN            Byte;
  UINTN            Bit;
  UINTN            Count;

  Head      = Pool->Head;
  AllocSize = USBHC_MEM_ROUND (Size);
  ToFree    = (UINT8 *)Mem;

  for (Block = Head; Block != NULL; Block = Block->Next) {
    //
    // scan the memory block list for the memory block that
    // completely contains the memory to free.
    //
    if ((Block->BufHost <= ToFree) && ((ToFree + AllocSize) <= (Block->BufHost + Block->BufLen))) {
      //
      // compute the start byte and bit in the bit array
      //
      Byte = ((ToFree - Block->BufHost) / USBHC_MEM_UNIT) / 8;
      Bit  = ((ToFree - Block->BufHost) / USBHC_MEM_UNIT) % 8;

      //
      // reset associated bits in bit array
      //
      for (Count = 0; Count < (AllocSize / USBHC_MEM_UNIT); Count++) {
        ASSERT (USB_HC_BIT_IS_SET (Block->Bits[Byte], Bit));

        Block->Bits[Byte] = (UINT8)(Block->Bits[Byte] ^ USB_HC_BIT (Bit));
        NEXT_BIT (Byte, Bit);
      }

      break;
    }
  }

  //
  // If Block == NULL, it means that the current memory isn't
  // in the host controller's pool. This is critical because
  // the caller has passed in a wrong memory pointer
  //
  ASSERT (Block != NULL);

  //
  // Release the current memory block if it is empty and not the head
  //
  if ((Block != Head) && UsbHcIsMemBlockEmpty (Block)) {
    UsbHcUnlinkMemBlock (Head, Block);
    UsbHcFreeMemBlock (Pool, Block);
  }
}

/**
  Allocates pages at a specified alignment.

  If Alignment is not a power of two and Alignment is not zero, then ASSERT().

  @param  Pages                 The number of pages to allocate.
  @param  Alignment             The requested alignment of the allocation.  Must be a power of two.
  @param  HostAddress           The system memory address to map to the PCI controller.
  @param  DeviceAddress         The resulting map address for the bus master PCI controller to
                                use to access the hosts HostAddress.
  @param  Mapping               A resulting value to pass to Unmap().

  @retval EFI_SUCCESS           Success to allocate aligned pages.
  @retval EFI_INVALID_PARAMETER Pages or Alignment is not valid.
  @retval EFI_OUT_OF_RESOURCES  Do not have enough resources to allocate memory.

**/
EFI_STATUS
UsbHcAllocateAlignedPages (
  IN UINTN                  Pages,
  IN UINTN                  Alignment,
  OUT VOID                  **HostAddress,
  OUT EFI_PHYSICAL_ADDRESS  *DeviceAddress,
  OUT VOID                  **Mapping
  )
{
  EFI_STATUS            Status;
  VOID                  *Memory;
  EFI_PHYSICAL_ADDRESS  DeviceMemory;

  //
  // Alignment must be a power of two or zero.
  //
  ASSERT ((Alignment & (Alignment - 1)) == 0);

  if ((Alignment & (Alignment - 1)) != 0) {
    return EFI_INVALID_PARAMETER;
  }

  if (Pages == 0) {
    return EFI_INVALID_PARAMETER;
  }

  if (Alignment > EFI_PAGE_SIZE) {
    Status = IoMmuAllocateAlignedBuffer (
               Pages,
               Alignment,
               &Memory,
               &DeviceMemory,
               Mapping
               );
    if (EFI_ERROR (Status)) {
      return EFI_OUT_OF_RESOURCES;
    }
  } else {
    //
    // Do not over-allocate pages in this case.
    //
    Status = IoMmuAllocateBuffer (
               Pages,
               &Memory,
               &DeviceMemory,
               Mapping
               );
    if (EFI_ERROR (Status)) {
      return EFI_OUT_OF_RESOURCES;
    }
  }

  *HostAddress   = Memory;
  *DeviceAddress = DeviceMemory;

  return EFI_SUCCESS;
}

/**
  Frees memory that was allocated with UsbHcAllocateAlignedPages().

  @param  HostAddress           The system memory address to map to the PCI controller.
  @param  Pages                 The number of pages to free.
  @param  Mapping               The mapping value returned from Map().

**/
VOID
UsbHcFreeAlignedPages (
  IN VOID   *HostAddress,
  IN UINTN  Pages,
  IN VOID   *Mapping
  )
{
  ASSERT (Pages != 0);

  IoMmuFreeBuffer (Pages, HostAddress, Mapping);
}