| bus_dma.9 (82d227dc2a61b530cad8fcc93877e62b075f7046) | bus_dma.9 (c7d3a65d43af3c6b31cd9e99d450ce4e47145f2f) |
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| 1.\" Copyright (c) 2002, 2003 Hiten M. Pandya. 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions, and the following disclaimer, --- 248 unchanged lines hidden (view full) --- 257.It Dv BUS_DMASYNC_POSTWRITE 258Perform any synchronization required after DMA write operations, but prior 259to CPU access of the memory. 260.It Dv BUS_DMASYNC_POSTREAD|BUS_DMASYNC_POSTWRITE 261Perform any synchronization required after a combination of DMA read 262and write operations. 263.El 264.It Vt bus_dma_lock_t | 1.\" Copyright (c) 2002, 2003 Hiten M. Pandya. 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions, and the following disclaimer, --- 248 unchanged lines hidden (view full) --- 257.It Dv BUS_DMASYNC_POSTWRITE 258Perform any synchronization required after DMA write operations, but prior 259to CPU access of the memory. 260.It Dv BUS_DMASYNC_POSTREAD|BUS_DMASYNC_POSTWRITE 261Perform any synchronization required after a combination of DMA read 262and write operations. 263.El 264.It Vt bus_dma_lock_t |
| 265Client specified lock/mutex manipulation method. This will be called from | 265Client specified lock/mutex manipulation method. 266This will be called from |
| 266within busdma whenever a client lock needs to be manipulated. 267This method is of the format: 268.Bl -tag -width compact 269.It Ft void 270.Fn "lockfunc" "void *lockfunc_arg" "bus_dma_lock_op_t op" 271.El 272.sp 273Two 274.Vt lockfunc 275implementations are provided for convenience. 276.Fn busdma_lock_mutex 277performs standard mutex operations on the sleep mutex provided via the 278.Fa lockfuncarg . 279passed into 280.Fn bus_dma_tag_create . 281.Fn dflt_lock | 267within busdma whenever a client lock needs to be manipulated. 268This method is of the format: 269.Bl -tag -width compact 270.It Ft void 271.Fn "lockfunc" "void *lockfunc_arg" "bus_dma_lock_op_t op" 272.El 273.sp 274Two 275.Vt lockfunc 276implementations are provided for convenience. 277.Fn busdma_lock_mutex 278performs standard mutex operations on the sleep mutex provided via the 279.Fa lockfuncarg . 280passed into 281.Fn bus_dma_tag_create . 282.Fn dflt_lock |
| 282will generate a system panic if it is called. It is substituted into 283the tag when | 283will generate a system panic if it is called. 284It is substituted into the tag when |
| 284.Fa lockfunc 285is passed as NULL to 286.Fn bus_dma_tag_create . 287.It Vt bus_dma_lock_op_t 288Operations to be performed by the client-specified 289.Fn lockfunc . 290.Bl -tag -width BUS_DMA_UNLOCK 291.It Dv BUS_DMA_LOCK --- 93 unchanged lines hidden (view full) --- 385Allocate the resources necessary to guarantee that all map load 386operations associated with this tag will not block. 387If sufficient resources are not available, 388.Er ENOMEM 389is returned. 390.El 391.It Fa lockfunc 392Optional lock manipulation function (may be NULL) to be called when busdma | 285.Fa lockfunc 286is passed as NULL to 287.Fn bus_dma_tag_create . 288.It Vt bus_dma_lock_op_t 289Operations to be performed by the client-specified 290.Fn lockfunc . 291.Bl -tag -width BUS_DMA_UNLOCK 292.It Dv BUS_DMA_LOCK --- 93 unchanged lines hidden (view full) --- 386Allocate the resources necessary to guarantee that all map load 387operations associated with this tag will not block. 388If sufficient resources are not available, 389.Er ENOMEM 390is returned. 391.El 392.It Fa lockfunc 393Optional lock manipulation function (may be NULL) to be called when busdma |
| 393needs to manipulate a lock on behalf of the client. If NULL is specified, | 394needs to manipulate a lock on behalf of the client. 395If NULL is specified, |
| 394.Fn dflt_lock 395is used. 396.It Fa lockfuncarg 397Optional argument to be passed to the function specified by 398.Fa lockfunc . 399.It Fa dmat 400Pointer to a bus_dma_tag_t where the resulting DMA tag will 401be stored. --- 381 unchanged lines hidden --- | 396.Fn dflt_lock 397is used. 398.It Fa lockfuncarg 399Optional argument to be passed to the function specified by 400.Fa lockfunc . 401.It Fa dmat 402Pointer to a bus_dma_tag_t where the resulting DMA tag will 403be stored. --- 381 unchanged lines hidden --- |