Date: Tue, 5 Sep 2006 10:55:21 -0700 (PDT) From: mjacob@freebsd.org To: John-Mark Gurney <gurney_j@resnet.uoregon.edu> Cc: freebsd-current@freebsd.org, freebsd-drivers@freebsd.org, freebsd-arch@freebsd.org Subject: Re: bus_get_dma_tag now necessary for drivers using bus_dma Message-ID: <20060905105320.S4962@ns1.feral.com> In-Reply-To: <20060905173334.GH9421@funkthat.com> References: <20060905173334.GH9421@funkthat.com>
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A __FreeBSD_version value of 700020 can be used in your drivers to distinguish the OS source that has the requirement and that which doesn't. On Tue, 5 Sep 2006, John-Mark Gurney wrote: > Over the weekend, I integrated some infastructure from the sun4v port. > It is the ability to have different bus_dma_tag_t's for different > parts of the device tree. This is necessary on systems like sparc64 > and sun4v that have different IOMMU's for different pci domains. > sparc64 glossed over this difference by programming both IOMMU's > exactly the same, but I decided to fix this for sun4v. > > This means that for each call to bus_dma_tag_create, instead of passing > a NULL pointer, you should call bus_get_dma_tag(yourdev) and use that > as the parent tag. I committed some example code to various drivers, > such as ahc, ata, em, and ohci. > > There is currently no functional change to the tree w/ this change. > > The driver changes will need to be done by hand as the device_t of the > current device is not always obviously available at the time > bus_dma_tag_create is called. > > Patches are welcome for the remaining unconverted drivers. > > -- > John-Mark Gurney Voice: +1 415 225 5579 > > "All that I will do, has been done, All that I have, has not." > _______________________________________________ > freebsd-drivers@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-drivers > To unsubscribe, send any mail to "freebsd-drivers-unsubscribe@freebsd.org" >
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