BLK_QUEUE_MAX_SEGMEN(9) Block Devices BLK_QUEUE_MAX_SEGMEN(9)NAME
blk_queue_max_segment_size - set max segment size for blk_rq_map_sg
SYNOPSIS
void blk_queue_max_segment_size(struct request_queue * q, unsigned int max_size);
ARGUMENTS
q
the request queue for the device
max_size
max size of segment in bytes
DESCRIPTION
Enables a low level driver to set an upper limit on the size of a coalesced segment
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 BLK_QUEUE_MAX_SEGMEN(9)
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ddi_dma_nextseg(9F) Kernel Functions for Drivers ddi_dma_nextseg(9F)NAME
ddi_dma_nextseg - get next DMA segment
SYNOPSIS
#include <sys/ddi.h>
#include <sys/sunddi.h>
int ddi_dma_nextseg(ddi_dma_win_t win, ddi_dma_seg_t seg, ddi_dma_seg_t *nseg);
INTERFACE LEVEL
This interface is obsolete. ddi_dma_nextcookie(9F) should be used instead.
PARAMETERS
win A DMA window.
seg The current DMA segment or NULL.
nseg A pointer to the next DMA segment to be filled in. If seg is NULL, a pointer to the first segment within the specified win-
dow is returned.
DESCRIPTION
ddi_dma_nextseg() gets the next DMA segment within the specified window win. If the current segment is NULL, the first DMA segment within
the window is returned.
A DMA segment is always required for a DMA window. A DMA segment is a contiguous portion of a DMA window (see ddi_dma_nextwin(9F)) which
is entirely addressable by the device for a data transfer operation.
An example where multiple DMA segments are allocated is where the system does not contain DVMA capabilities and the object may be non-con-
tiguous. In this example the object will be broken into smaller contiguous DMA segments. Another example is where the device has an upper
limit on its transfer size (for example an 8-bit address register) and has expressed this in the DMA limit structure (see
ddi_dma_lim_sparc(9S) or ddi_dma_lim_x86(9S)). In this example the object will be broken into smaller addressable DMA segments.
RETURN VALUES
ddi_dma_nextseg() returns:
DDI_SUCCESS Successfully filled in the next segment pointer.
DDI_DMA_DONE There is no next segment. The current segment is the final segment within the specified window.
DDI_DMA_STALE win does not refer to the currently active window.
CONTEXT
ddi_dma_nextseg() can be called from user or interrupt context.
EXAMPLES
For an example, see ddi_dma_segtocookie(9F).
ATTRIBUTES
See attributes(5) for a description of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Stability Level |Obsolete |
+-----------------------------+-----------------------------+
SEE ALSO attributes(5), ddi_dma_addr_setup(9F), ddi_dma_buf_setup(9F), ddi_dma_nextcookie(9F), ddi_dma_nextwin(9F), ddi_dma_segtocookie(9F),
ddi_dma_sync(9F), ddi_dma_lim_sparc(9S), ddi_dma_lim_x86(9S), ddi_dma_req(9S)
Writing Device Drivers
SunOS 5.10 27 Sep 2002 ddi_dma_nextseg(9F)
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