On Wed, May 9, 2018 at 8:37 PM, Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> wrote: > On Wed, May 09, 2018 at 04:13:12PM +0300, Gilad Ben-Yossef wrote: >> On Wed, May 9, 2018 at 3:12 PM, Harsh Jain <harshjain.prof@xxxxxxxxx> wrote: >> > Hi Herbert, >> > >> > Can we use buffer defined in ahash request context(private space for >> > each request) to DMA map it to H/W.? >> >> Not Herbert but... the ccree driver is doing just and Herbert >> specifically indicated ahash request contexts are not allowed to be >> allocated from stack (I asked) so it should be OK. > > That's right. For async algorithms the request must come from > kmalloc memory. Thanks Herbert/Gilad. It means, It's perfectly fine to have array of required(For DMA) memory in request context structure and DMA map it later on. > > Cheers, > -- > Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> > Home Page: http://gondor.apana.org.au/~herbert/ > PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
