Messages in this thread | | | Date | Mon, 28 Oct 2019 13:38:05 +0100 | From | "" <> | Subject | Re: [PATCH v2 1/3] dma-mapping: introduce new dma unmap and sync api variants |
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On Thu, Oct 24, 2019 at 12:41:41PM +0000, Laurentiu Tudor wrote: > From: Laurentiu Tudor <laurentiu.tudor@nxp.com> > > Introduce a few new dma unmap and sync variants that, on top of the > original variants, return the virtual address corresponding to the > input dma address. > In order to implement this a new dma map op is added and used: > void *get_virt_addr(dev, dma_handle); > It does the actual conversion of an input dma address to the output > virtual address.
We'll definitively need an implementation for dma-direct at least as well. Also as said previously we need a dma_can_unmap_by_dma_addr() or similar helper that tells the driver beforehand if this works, so that the driver can either use a sub-optimal workaround or fail the probe if this functionality isn't implemented.
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