Nabil Rahiman wrote:
> Hi,
>
> I am trying to port the lnux device driver into Solaris platform.
Are you aware there are usually licensing issues with
porting a driver from Linux to Solaris? i.e. Linux
drivers usually have a GPLv2 license and therefore
can't be included with Solaris/OpenSolaris.
> In Solaris for allocatting dma resource, we have to set the
> following set of dma attributes.
>
> typedef struct ddi_dma_attr {
>
> uint_t dma_attr_version; /* version number */
> uint64_t dma_attr_addr_lo; /* low DMA address range */
> uint64_t dma_attr_addr_hi; /* high DMA address range */
>
> uint64_t dma_attr_count_max; /* DMA counter register */
> uint64_t dma_attr_align; /* DMA address alignment */
> uint_t dma_attr_burstsizes; /* DMA burstsizes */
>
> uint32_t dma_attr_minxfer; /* min effective DMA size */
> uint64_t dma_attr_maxxfer; /* max DMA xfer size */
> uint64_t dma_attr_seg; /* segment boundary */
>
> int dma_attr_sgllen; /* s/g length */
> uint32_t dma_attr_granular; /* granularity of device */
> uint_t dma_attr_flags; /* Bus specific DMA flags */
>
> } ddi_dma_attr_t;
>
>
> And most of these attribute values are specific to the device.
>
> But I couldn't find out the corresponding structure/functionality in Linux.
>
> Please guide me.
I'm not sure what you are asking. Could you re-word it? I made a
pass at what all the fields are used for.
> uint_t dma_attr_version; /* version number */
should be set to DMA_ATTR_V0
> uint64_t dma_attr_addr_lo; /* low DMA address range */
the lowest physical address the device can dma to.
Set to 0x0.
> uint64_t dma_attr_addr_hi; /* high DMA address range */
The highest dma address the device can DMA to (i.e. when
you need to use a copy/bounce buffer). Usually set to
0xFFFF.FFFF or 0xFFFF.FFFF.FFFF.FFFF
> uint64_t dma_attr_count_max; /* DMA counter register */
The maximum size of a single physically contiguous region (cookie)
you want return from ddi_dma_*_bind().
> uint64_t dma_attr_align; /* DMA address alignment */
The buffer alignment. Only use in ddi_dma_mem_alloc().
> uint_t dma_attr_burstsizes; /* DMA burstsizes */
Not used. Set to 0x1.
> uint32_t dma_attr_minxfer; /* min effective DMA size */
Minimum xfer size. Not used on x86. Usually set to 1.
> uint64_t dma_attr_maxxfer; /* max DMA xfer size */
maximum size dma a device can do. usually this ==
(dma_attr_count_max * dma_attr_sgllen), but not always.
Once you exceed this, the ddi_dma_*_bind() will break
the bind into multiple windows (assuming you support
partial maps). It may also break it into multiple
windows if your devices needs to use a bounce buffer
and you exceeded the maximum size of the bounce
buffer.
> uint64_t dma_attr_seg; /* segment boundary */
Address boundary that a device cannot DMA over. Usually
used on old devices and/or bus technologies. usually
st to 0xFFFF.FFFF
> int dma_attr_sgllen; /* s/g length */
The maximum number of physically contiguous regions (cookies)
that the device supports.
> uint32_t dma_attr_granular; /* granularity of device */
uses when breaking a buffer into multiple windows. The
windows will be broken into whole multiples of granularity.
commonly used in storage drivers which do DMAs in 512 byte
chunks. usually set to 1 or 512.
> uint_t dma_attr_flags; /* Bus specific DMA flags */
Set to 0x0.
MRJ
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