On Dec 17, 2009, at 11:09 AM, Ira W. Snyder wrote: > On Wed, Dec 16, 2009 at 03:47:48PM -0700, Dan Williams wrote: >> Kumar Gala wrote: >>>>> Changes with respect to v1 as per comments received >>>>> o. Rebased to linux-next as of 20091216 >>>>> o. The selection is based exclusive of fsldma >>>>> o. Intoduced a new Kernel Configuration variable >>>>> *. This enables selecting the Cryptographic functionality >>>>> of Talitos along with fsldma. >>>>> *. Disables the XOR parity calculation offload, if fsldma enabled >>>>> either as kernel in-built or as a module >>>>> *. Once the inter-operability with fsldma is resolved, this option >>>>> can be removed >>>> wait, why can't the interoperability bug be fixed in the first place? >>> >>> I agree w/Kim. We need to better understand what the bug is and how to reproduce it so we can get to the root cause. >>> >>> Paper taping over it by disabling fsldma is not the right solution. >> >> Hopefully this prompts fsldma authors to get involved because the >> interoperability issue has been out there without comment*, just >> band-aids, since October. >> >> -- >> Dan >> >> * well one comment from Ira saying the interrupt functionality worked >> for him. > > Yes, I have used the device_prep_dma_interrupt() functionality quite a > while back. However, I found it to be pretty much useless. Any > functionality I need is covered by adding a callback to the last DMA > memcpy() operation. Since the operations happen in-order, I can be sure > that the entire set of memcpy()s cas completed. I never needed the > capability to generate an interrupt without a memcpy(). > > I agree that the fsldma driver could use some love. There are places > where I am still not confident in the locking. Perhaps I can find some > time over Christmas to work on it, but I need someone with 85xx/86xx > hardware to test the changes. I only have 83xx hardware. I can test on 85xx/86xx if you work up some patches. - k-- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
