iSeries_dma.h
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上传日期:2013-04-10
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- /*
- * iSeries_dma.h
- * Copyright (C) 2001 Mike Corrigan IBM Corporation
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
- #ifndef _ISERIES_DMA_H
- #define _ISERIES_DMA_H
- #include <asm/types.h>
- #ifndef __LINUX_SPINLOCK_H
- #include <linux/spinlock.h>
- #endif
- // NUM_TCE_LEVELS defines the largest contiguous block
- // of dma (tce) space we can get. NUM_TCE_LEVELS = 10
- // allows up to 2**9 pages (512 * 4096) = 2 MB
- #define NUM_TCE_LEVELS 10
- #define NO_TCE ((dma_addr_t)-1)
- // Tces come in two formats, one for the virtual bus and a different
- // format for PCI
- #define TCE_VB 0
- #define TCE_PCI 1
- union Tce {
- u64 wholeTce;
- struct {
- u64 cacheBits :6; /* Cache hash bits - not used */
- u64 rsvd :6;
- u64 rpn :40; /* Absolute page number */
- u64 valid :1; /* Tce is valid (vb only) */
- u64 allIo :1; /* Tce is valid for all lps (vb only) */
- u64 lpIndex :8; /* LpIndex for user of TCE (vb only) */
- u64 pciWrite :1; /* Write allowed (pci only) */
- u64 readWrite :1; /* Read allowed (pci), Write allowed
- (vb) */
- } tceBits;
- };
- struct Bitmap {
- unsigned long numBits;
- unsigned long numBytes;
- unsigned char * map;
- };
- struct MultiLevelBitmap {
- unsigned long maxLevel;
- struct Bitmap level[NUM_TCE_LEVELS];
- };
- struct TceTable {
- u64 busNumber;
- u64 size;
- u64 startOffset;
- u64 index;
- spinlock_t lock;
- struct MultiLevelBitmap mlbm;
- };
- struct HvTceTableManagerCB {
- u64 busNumber; /* Bus number for this tce table */
- u64 start; /* Will be NULL for secondary */
- u64 totalSize; /* Size (in pages) of whole table */
- u64 startOffset; /* Index into real tce table of the
- start of our section */
- u64 size; /* Size (in pages) of our section */
- u64 index; /* Index of this tce table (token?) */
- u16 maxTceTableIndex; /* Max number of tables for partition */
- u8 virtualBusFlag; /* Flag to indicate virtual bus */
- u8 rsvd[5];
- };
- extern struct TceTable virtBusTceTable; /* Tce table for virtual bus */
- extern struct TceTable * build_tce_table( struct HvTceTableManagerCB *,
- struct TceTable *);
- extern void create_virtual_bus_tce_table( void );
- extern void create_pci_bus_tce_table( unsigned busNumber );
- #endif // _ISERIES_DMA_H