On Thu, Oct 24, 2013 at 04:03:12PM -0700, Ben Skeggs wrote: > On Fri, Oct 25, 2013 at 7:43 AM, Robert Morell <rmor...@nvidia.com> wrote: > > On Mon, Sep 30, 2013 at 10:44:12AM -0700, Lucas Stach wrote: > >> Hi, > >> > >> recently we tried to enable MSI interrupts with nouveau. Unfortunately > >> there have been some reports of things failing with certain cards, where > >> it isn't entirely clear if this is a GPU errata or some other component > >> in the PCIe chain failing. > >> > >> Could you perhaps investigate if there are any known Nvidia GPU erratas > >> with regard to MSI interrupts, or maybe tell us the generations of cards > >> that are generally safe to enable MSIs with? > > > > Sorry for the slow reply, Lucas. > > > > We enabled MSI interrupts by default relatively recently in the proprietary > > driver (version 325.08, released 2013-07-01 according to our public > > changelog). This was enabled across the board for all of the GPUs supported > > by the latest release series, so NV50 and up. We believe it should be safe > > to > > enable MSI on those GPUs. We never enabled MSI by default on earlier GPUs > > so > > I can't comment there. > > > > I investigated our internal documentation and source code, and found a > > couple > > of things that are probably interesting to you: > > - For all pre-Fermi GPUs, we use a write through PCI config space to the > > "EOI" > > register to rearm the MSI interrupt after servicing it, rather than a > > write > > through the MMIO pcicfg shadow region in the GPU's PCI BAR0 window at > > offset > > 0x88000. (This was actually originally implemented for NV4x, so you'll > > probably want to do that there as well.) > Hm, I recently discovered this while looking for the errata myself, > but it seems you guys only do it on G80/G84/G86, and use 0x88068 at > some point after that, before Fermi (G96/GT200, for example).
Yes, you're right; I was reading this wrong. The config space path described above is used on G8x and G92. Newer GPUs (other than GF100 and GF104 as mentioned previously) use the "normal" path. - Robert _______________________________________________ Nouveau mailing list Nouveau@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/nouveau
