On Sat, Jan 9, 2010 at 10:11 AM, Tejun Heo <tj@xxxxxxxxxx> wrote: > On 12/25/2009 06:22 PM, Torsten Kaiser wrote: >> As reported in http://lkml.org/lkml/2009/12/19/82 the new MSI support >> for sata_sil24 does not work for me. >> This is still the same with 2.6.33-rc2. >> >> Why I think, this might be a problem within libata: >> * other drivers can use MSI successful on my system (tg3, radeon, hda-intel) >> * happens both in sata_sil24 and sata_nv >> * the count in /proc/interrupts increases for the MSIs assigned to >> sata_sil24/sata_nv, so interrupt delivery seems to work >> * only writing seems to fail > > How does it fail? Timeouts? Yes, timeouts. I posted the error messages in http://lkml.org/lkml/2009/12/19/82 and http://lkml.org/lkml/2010/1/6/60 > Also, ahci enables MSI by default if > available and works fine on many configurations so I don't think > anything in libata core layer is broken regarding MSI (there just > isn't anything which can break). The system I'm using does not have a ahci compatible controller, so I could not compare this. (And my other system that is using ahci, does not use MSI for that) I just found it suspicious that 3 other drivers (tg3, hda-intel and radeon) can use MSI, but both of the libata drivers (sata_sil24 and sata_nv) fail in a similar way. I did try the patch from Robert Hancock in http://lkml.org/lkml/2010/1/6/417 ,but without success. if you need any more information, or have something for me to try, please just ask. I did look at the code and the documentation about enabling MSI, but did not see anything (obvious) wrong, so I don't know what to try next. Torsten -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
