hi mulyadi 2012/4/6 Mulyadi Santosa <mulyadi.santosa@xxxxxxxxx>: > Hi... > > On Fri, Apr 6, 2012 at 09:19, loody <miloody@xxxxxxxxx> wrote: >> hi all: >> I am trying to write a driver for my block device which dma support >> high memory copying. >> I have register my device as "blk_bounce_any". >> But my driver cannot see block layer pass high memory to me so far. > > perhaps because you need to kmap them first? If I remember correctly, Kmap is used for mapping high memory into kernel virtual memory. Isn't that the job for block layer? I thought once I declare my block device as "blk_bounce_any", the block layer will pass the physical address of high memory to device. > > BTW, is it 32 bit or 64 bit Linux kernel? 32-bits linux kernel. > >> Is there any user/kernel test program which will purposely send high >> memory for driver to use? >> or is there any flag when opening a file in user mode that will use high memory? > > I recheck mmap and mmap manual page and I found none of such flag does that mean mmap can specify which memory to map? if that is true, which range I should use? > > -- > regards, > > Mulyadi Santosa > Freelance Linux trainer and consultant > > blog: the-hydra.blogspot.com > training: mulyaditraining.blogspot.com Appreciate your help _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
