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audk/MdeModulePkg/Bus/Pci/EhciPei/UsbHcMem.c

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/** @file
PEIM to produce gPeiUsb2HostControllerPpiGuid based on gPeiUsbControllerPpiGuid
which is used to enable recovery function from USB Drivers.
Copyright (c) 2010 - 2017, Intel Corporation. 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 "EhcPeim.h"
/**
Allocate a block of memory to be used by the buffer pool.
@param Ehc The EHCI device.
@param Pool The buffer pool to allocate memory for.
@param Pages How many pages to allocate.
@return The allocated memory block or NULL if failed.
**/
USBHC_MEM_BLOCK *
UsbHcAllocMemBlock (
IN PEI_USB2_HC_DEV *Ehc,
IN USBHC_MEM_POOL *Pool,
IN UINTN Pages
)
{
USBHC_MEM_BLOCK *Block;
VOID *BufHost;
VOID *Mapping;
EFI_PHYSICAL_ADDRESS MappedAddr;
EFI_STATUS Status;
UINTN PageNumber;
EFI_PHYSICAL_ADDRESS TempPtr;
Mapping = NULL;
PageNumber = sizeof(USBHC_MEM_BLOCK)/PAGESIZE +1;
Status = PeiServicesAllocatePages (
EfiBootServicesCode,
PageNumber,
&TempPtr
);
if (EFI_ERROR (Status)) {
return NULL;
}
ZeroMem ((VOID *)(UINTN)TempPtr, PageNumber*EFI_PAGE_SIZE);
//
// 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 = (Block->BitsLen)/PAGESIZE +1;
Status = PeiServicesAllocatePages (
EfiBootServicesCode,
PageNumber,
&TempPtr
);
if (EFI_ERROR (Status)) {
return NULL;
}
ZeroMem ((VOID *)(UINTN)TempPtr, PageNumber*EFI_PAGE_SIZE);
Block->Bits = (UINT8 *)(UINTN)TempPtr;
Status = IoMmuAllocateBuffer (
Ehc->IoMmu,
Pages,
(VOID **) &BufHost,
&MappedAddr,
&Mapping
);
if (EFI_ERROR (Status)) {
return NULL;
}
ZeroMem (BufHost, Pages*EFI_PAGE_SIZE);
//
// Check whether the data structure used by the host controller
// should be restricted into the same 4G
//
if (Pool->Check4G && (Pool->Which4G != USB_HC_HIGH_32BIT (MappedAddr))) {
return NULL;
}
Block->BufHost = BufHost;
Block->Buf = (UINT8 *) ((UINTN) MappedAddr);
Block->Mapping = Mapping;
Block->Next = NULL;
return Block;
}
/**
Free the memory block from the memory pool.
@param Ehc The EHCI device.
@param Pool The memory pool to free the block from.
@param Block The memory block to free.
**/
VOID
UsbHcFreeMemBlock (
IN PEI_USB2_HC_DEV *Ehc,
IN USBHC_MEM_POOL *Pool,
IN USBHC_MEM_BLOCK *Block
)
{
ASSERT ((Pool != NULL) && (Block != NULL));
IoMmuFreeBuffer (Ehc->IoMmu, EFI_SIZE_TO_PAGES (Block->BufLen), Block->BufHost, Block->Mapping);
}
/**
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->Buf + (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.
@return the pci memory address
**/
EFI_PHYSICAL_ADDRESS
UsbHcGetPciAddressForHostMem (
IN USBHC_MEM_POOL *Pool,
IN VOID *Mem,
IN UINTN Size
)
{
USBHC_MEM_BLOCK *Head;
USBHC_MEM_BLOCK *Block;
UINTN AllocSize;
EFI_PHYSICAL_ADDRESS PhyAddr;
UINTN Offset;
Head = Pool->Head;
AllocSize = USBHC_MEM_ROUND (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;
}
/**
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;
}
/**
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;
}
}
}
/**
Initialize the memory management pool for the host controller.
@param Ehc The EHCI device.
@param Check4G Whether the host controller requires allocated memory.
from one 4G address space.
@param Which4G The 4G memory area each memory allocated should be from.
@retval EFI_SUCCESS The memory pool is initialized.
@retval EFI_OUT_OF_RESOURCE Fail to init the memory pool.
**/
USBHC_MEM_POOL *
UsbHcInitMemPool (
IN PEI_USB2_HC_DEV *Ehc,
IN BOOLEAN Check4G,
IN UINT32 Which4G
)
{
USBHC_MEM_POOL *Pool;
UINTN PageNumber;
EFI_STATUS Status;
EFI_PHYSICAL_ADDRESS TempPtr;
PageNumber = sizeof(USBHC_MEM_POOL)/PAGESIZE +1;
Status = PeiServicesAllocatePages (
EfiBootServicesCode,
PageNumber,
&TempPtr
);
if (EFI_ERROR (Status)) {
return NULL;
}
ZeroMem ((VOID *)(UINTN)TempPtr, PageNumber*EFI_PAGE_SIZE);
Pool = (USBHC_MEM_POOL *) ((UINTN) TempPtr);
Pool->Check4G = Check4G;
Pool->Which4G = Which4G;
Pool->Head = UsbHcAllocMemBlock (Ehc, Pool, USBHC_MEM_DEFAULT_PAGES);
if (Pool->Head == NULL) {
Pool = NULL;
}
return Pool;
}
/**
Release the memory management pool.
@param Ehc The EHCI device.
@param Pool The USB memory pool to free.
@retval EFI_DEVICE_ERROR Fail to free the memory pool.
@retval EFI_SUCCESS The memory pool is freed.
**/
EFI_STATUS
UsbHcFreeMemPool (
IN PEI_USB2_HC_DEV *Ehc,
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 = Block->Next) {
UsbHcFreeMemBlock (Ehc, Pool, Block);
}
UsbHcFreeMemBlock (Ehc, Pool, Pool->Head);
return EFI_SUCCESS;
}
/**
Allocate some memory from the host controller's memory pool
which can be used to communicate with host controller.
@param Ehc The EHCI device.
@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 PEI_USB2_HC_DEV *Ehc,
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) + 1;
} else {
Pages = USBHC_MEM_DEFAULT_PAGES;
}
NewBlock = UsbHcAllocMemBlock (Ehc,Pool, 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 Ehc The EHCI device.
@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 PEI_USB2_HC_DEV *Ehc,
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->Buf <= ToFree) && ((ToFree + AllocSize) <= (Block->Buf + Block->BufLen))) {
//
// compute the start byte and bit in the bit array
//
Byte = ((ToFree - Block->Buf) / USBHC_MEM_UNIT) / 8;
Bit = ((ToFree - Block->Buf) / 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 point
//
ASSERT (Block != NULL);
//
// Release the current memory block if it is empty and not the head
//
if ((Block != Head) && UsbHcIsMemBlockEmpty (Block)) {
UsbHcFreeMemBlock (Ehc, Pool, Block);
}
return ;
}
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