dd0fc66fb3
- added typedef unsigned int __nocast gfp_t; - replaced __nocast uses for gfp flags with gfp_t - it gives exactly the same warnings as far as sparse is concerned, doesn't change generated code (from gcc point of view we replaced unsigned int with typedef) and documents what's going on far better. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
147 lines
5.0 KiB
C
147 lines
5.0 KiB
C
/*
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* iommu.h
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* Copyright (C) 2001 Mike Corrigan & Dave Engebretsen, IBM Corporation
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* Rewrite, cleanup:
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* Copyright (C) 2004 Olof Johansson <olof@austin.ibm.com>, IBM Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _ASM_IOMMU_H
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#define _ASM_IOMMU_H
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#include <asm/types.h>
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#include <linux/spinlock.h>
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#include <linux/device.h>
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#include <linux/dma-mapping.h>
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/*
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* IOMAP_MAX_ORDER defines the largest contiguous block
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* of dma (tce) space we can get. IOMAP_MAX_ORDER = 13
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* allows up to 2**12 pages (4096 * 4096) = 16 MB
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*/
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#define IOMAP_MAX_ORDER 13
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/*
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* Tces come in two formats, one for the virtual bus and a different
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* format for PCI
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*/
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#define TCE_VB 0
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#define TCE_PCI 1
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/* tce_entry
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* Used by pSeries (SMP) and iSeries/pSeries LPAR, but there it's
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* abstracted so layout is irrelevant.
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*/
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union tce_entry {
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unsigned long te_word;
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struct {
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unsigned int tb_cacheBits :6; /* Cache hash bits - not used */
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unsigned int tb_rsvd :6;
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unsigned long tb_rpn :40; /* Real page number */
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unsigned int tb_valid :1; /* Tce is valid (vb only) */
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unsigned int tb_allio :1; /* Tce is valid for all lps (vb only) */
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unsigned int tb_lpindex :8; /* LpIndex for user of TCE (vb only) */
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unsigned int tb_pciwr :1; /* Write allowed (pci only) */
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unsigned int tb_rdwr :1; /* Read allowed (pci), Write allowed (vb) */
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} te_bits;
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#define te_cacheBits te_bits.tb_cacheBits
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#define te_rpn te_bits.tb_rpn
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#define te_valid te_bits.tb_valid
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#define te_allio te_bits.tb_allio
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#define te_lpindex te_bits.tb_lpindex
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#define te_pciwr te_bits.tb_pciwr
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#define te_rdwr te_bits.tb_rdwr
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};
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struct iommu_table {
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unsigned long it_busno; /* Bus number this table belongs to */
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unsigned long it_size; /* Size of iommu table in entries */
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unsigned long it_offset; /* Offset into global table */
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unsigned long it_base; /* mapped address of tce table */
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unsigned long it_index; /* which iommu table this is */
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unsigned long it_type; /* type: PCI or Virtual Bus */
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unsigned long it_blocksize; /* Entries in each block (cacheline) */
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unsigned long it_hint; /* Hint for next alloc */
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unsigned long it_largehint; /* Hint for large allocs */
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unsigned long it_halfpoint; /* Breaking point for small/large allocs */
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spinlock_t it_lock; /* Protects it_map */
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unsigned long *it_map; /* A simple allocation bitmap for now */
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};
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struct scatterlist;
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#ifdef CONFIG_PPC_MULTIPLATFORM
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/* Walks all buses and creates iommu tables */
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extern void iommu_setup_pSeries(void);
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extern void iommu_setup_u3(void);
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/* Frees table for an individual device node */
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extern void iommu_free_table(struct device_node *dn);
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#endif /* CONFIG_PPC_MULTIPLATFORM */
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#ifdef CONFIG_PPC_PSERIES
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/* Creates table for an individual device node */
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extern void iommu_devnode_init_pSeries(struct device_node *dn);
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#endif /* CONFIG_PPC_PSERIES */
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#ifdef CONFIG_PPC_ISERIES
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struct iSeries_Device_Node;
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/* Creates table for an individual device node */
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extern void iommu_devnode_init_iSeries(struct iSeries_Device_Node *dn);
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#endif /* CONFIG_PPC_ISERIES */
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/* Initializes an iommu_table based in values set in the passed-in
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* structure
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*/
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extern struct iommu_table *iommu_init_table(struct iommu_table * tbl);
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extern int iommu_map_sg(struct device *dev, struct iommu_table *tbl,
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struct scatterlist *sglist, int nelems,
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enum dma_data_direction direction);
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extern void iommu_unmap_sg(struct iommu_table *tbl, struct scatterlist *sglist,
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int nelems, enum dma_data_direction direction);
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extern void *iommu_alloc_coherent(struct iommu_table *tbl, size_t size,
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dma_addr_t *dma_handle, gfp_t flag);
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extern void iommu_free_coherent(struct iommu_table *tbl, size_t size,
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void *vaddr, dma_addr_t dma_handle);
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extern dma_addr_t iommu_map_single(struct iommu_table *tbl, void *vaddr,
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size_t size, enum dma_data_direction direction);
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extern void iommu_unmap_single(struct iommu_table *tbl, dma_addr_t dma_handle,
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size_t size, enum dma_data_direction direction);
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extern void iommu_init_early_pSeries(void);
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extern void iommu_init_early_iSeries(void);
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extern void iommu_init_early_u3(void);
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#ifdef CONFIG_PCI
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extern void pci_iommu_init(void);
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extern void pci_direct_iommu_init(void);
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#else
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static inline void pci_iommu_init(void) { }
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#endif
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extern void alloc_u3_dart_table(void);
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#endif /* _ASM_IOMMU_H */
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