f6b1c44d1f
Add two new arguments to bus_dma_tag_create(): lockfunc and lockfuncarg. Lockfunc allows a driver to provide a function for managing its locking semantics while using busdma. At the moment, this is used for the asynchronous busdma_swi and callback mechanism. Two lockfunc implementations are provided: busdma_lock_mutex() performs standard mutex operations on the mutex that is specified from lockfuncarg. dftl_lock() is a panic implementation and is defaulted to when NULL, NULL are passed to bus_dma_tag_create(). The only time that NULL, NULL should ever be used is when the driver ensures that bus_dmamap_load() will not be deferred. Drivers that do not provide their own locking can pass busdma_lock_mutex,&Giant args in order to preserve the former behaviour. sparc64 and powerpc do not provide real busdma_swi functions, so this is largely a noop on those platforms. The busdma_swi on is64 is not properly locked yet, so warnings will be emitted on this platform when busdma callback deferrals happen. If anyone gets panics or warnings from dflt_lock() being called, please let me know right away. Reviewed by: tmm, gibbs
258 lines
9.5 KiB
C
258 lines
9.5 KiB
C
/* $NetBSD: bus.h,v 1.12 1997/10/01 08:25:15 fvdl Exp $ */
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/*-
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* Copyright (c) 1996, 1997 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
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* NASA Ames Research Center.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 1996 Charles M. Hannum. All rights reserved.
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* Copyright (c) 1996 Christopher G. Demetriou. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Christopher G. Demetriou
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* for the NetBSD Project.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/* $FreeBSD$ */
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#ifndef _I386_BUS_DMA_H_
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#define _I386_BUS_DMA_H_
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/*
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* Flags used in various bus DMA methods.
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*/
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#define BUS_DMA_WAITOK 0x00 /* safe to sleep (pseudo-flag) */
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#define BUS_DMA_NOWAIT 0x01 /* not safe to sleep */
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#define BUS_DMA_ALLOCNOW 0x02 /* perform resource allocation now */
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#define BUS_DMA_COHERENT 0x04 /* hint: map memory in a coherent way */
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#define BUS_DMA_BUS1 0x10 /* placeholders for bus functions... */
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#define BUS_DMA_BUS2 0x20
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#define BUS_DMA_BUS3 0x40
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#define BUS_DMA_BUS4 0x80
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/* Forwards needed by prototypes below. */
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struct mbuf;
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struct uio;
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/*
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* Operations performed by bus_dmamap_sync().
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*/
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typedef int bus_dmasync_op_t;
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#define BUS_DMASYNC_PREREAD 1
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#define BUS_DMASYNC_POSTREAD 2
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#define BUS_DMASYNC_PREWRITE 4
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#define BUS_DMASYNC_POSTWRITE 8
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/*
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* bus_dma_tag_t
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*
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* A machine-dependent opaque type describing the characteristics
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* of how to perform DMA mappings. This structure encapsultes
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* information concerning address and alignment restrictions, number
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* of S/G segments, amount of data per S/G segment, etc.
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*/
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typedef struct bus_dma_tag *bus_dma_tag_t;
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/*
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* bus_dmamap_t
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*
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* DMA mapping instance information.
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*/
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typedef struct bus_dmamap *bus_dmamap_t;
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/*
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* bus_dma_segment_t
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*
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* Describes a single contiguous DMA transaction. Values
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* are suitable for programming into DMA registers.
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*/
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typedef struct bus_dma_segment {
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bus_addr_t ds_addr; /* DMA address */
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bus_size_t ds_len; /* length of transfer */
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} bus_dma_segment_t;
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/*
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* A function that returns 1 if the address cannot be accessed by
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* a device and 0 if it can be.
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*/
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typedef int bus_dma_filter_t(void *, bus_addr_t);
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/*
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* A function that performs driver-specific syncronization on behalf of
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* busdma.
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*/
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typedef enum {
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BUS_DMA_LOCK = 0x01,
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BUS_DMA_UNLOCK = 0x02,
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} bus_dma_lock_op_t;
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typedef void bus_dma_lock_t(void *, bus_dma_lock_op_t);
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/*
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* Allocate a device specific dma_tag encapsulating the constraints of
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* the parent tag in addition to other restrictions specified:
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*
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* alignment: alignment for segments.
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* boundary: Boundary that segments cannot cross.
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* lowaddr: Low restricted address that cannot appear in a mapping.
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* highaddr: High restricted address that cannot appear in a mapping.
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* filtfunc: An optional function to further test if an address
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* within the range of lowaddr and highaddr cannot appear
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* in a mapping.
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* filtfuncarg: An argument that will be passed to filtfunc in addition
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* to the address to test.
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* maxsize: Maximum mapping size supported by this tag.
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* nsegments: Number of discontinuities allowed in maps.
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* maxsegsz: Maximum size of a segment in the map.
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* flags: Bus DMA flags.
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* dmat: A pointer to set to a valid dma tag should the return
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* value of this function indicate success.
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*/
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/* XXX Should probably allow specification of alignment */
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int bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t alignment,
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bus_size_t boundary, bus_addr_t lowaddr,
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bus_addr_t highaddr, bus_dma_filter_t *filtfunc,
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void *filtfuncarg, bus_size_t maxsize, int nsegments,
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bus_size_t maxsegsz, int flags, bus_dma_lock_t *lockfunc,
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void *lockfuncarg, bus_dma_tag_t *dmat);
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int bus_dma_tag_destroy(bus_dma_tag_t dmat);
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/*
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* Allocate a handle for mapping from kva/uva/physical
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* address space into bus device space.
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*/
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int bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp);
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/*
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* Destroy a handle for mapping from kva/uva/physical
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* address space into bus device space.
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*/
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int bus_dmamap_destroy(bus_dma_tag_t dmat, bus_dmamap_t map);
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/*
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* Allocate a piece of memory that can be efficiently mapped into
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* bus device space based on the constraints lited in the dma tag.
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* A dmamap to for use with dmamap_load is also allocated.
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*/
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int bus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddr, int flags,
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bus_dmamap_t *mapp);
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/*
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* Free a piece of memory and it's allociated dmamap, that was allocated
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* via bus_dmamem_alloc.
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*/
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void bus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map);
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/*
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* A function that processes a successfully loaded dma map or an error
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* from a delayed load map.
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*/
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typedef void bus_dmamap_callback_t(void *, bus_dma_segment_t *, int, int);
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/*
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* Map the buffer buf into bus space using the dmamap map.
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*/
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int bus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf,
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bus_size_t buflen, bus_dmamap_callback_t *callback,
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void *callback_arg, int flags);
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/*
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* Like bus_dmamap_callback but includes map size in bytes. This is
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* defined as a separate interface to maintain compatiiblity for users
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* of bus_dmamap_callback_t--at some point these interfaces should be merged.
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*/
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typedef void bus_dmamap_callback2_t(void *, bus_dma_segment_t *, int, bus_size_t, int);
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/*
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* Like bus_dmamap_load but for mbufs. Note the use of the
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* bus_dmamap_callback2_t interface.
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*/
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int bus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map,
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struct mbuf *mbuf,
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bus_dmamap_callback2_t *callback, void *callback_arg,
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int flags);
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/*
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* Like bus_dmamap_load but for uios. Note the use of the
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* bus_dmamap_callback2_t interface.
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*/
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int bus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map,
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struct uio *ui,
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bus_dmamap_callback2_t *callback, void *callback_arg,
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int flags);
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/*
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* Perform a syncronization operation on the given map.
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*/
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void _bus_dmamap_sync(bus_dma_tag_t, bus_dmamap_t, bus_dmasync_op_t);
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#define bus_dmamap_sync(dmat, dmamap, op) \
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if ((dmamap) != NULL) \
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_bus_dmamap_sync(dmat, dmamap, op)
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/*
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* Release the mapping held by map.
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*/
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void _bus_dmamap_unload(bus_dma_tag_t dmat, bus_dmamap_t map);
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#define bus_dmamap_unload(dmat, dmamap) \
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if ((dmamap) != NULL) \
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_bus_dmamap_unload(dmat, dmamap)
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/*
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* Generic helper function for manipulating mutexes.
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*/
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void busdma_lock_mutex(void *arg, bus_dma_lock_op_t op);
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#endif /* _I386_BUS_DMA_H_ */
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