On Sun, Sep 07, 2014 at 09:08:31AM +0100, Chris Wilson wrote: > Running igt, I was encountering the invalid TLB bug on my 845g, despite > that it was using the CS workaround. Examining the w/a buffer in the > error state, showed that the copy from the user batch into the > workaround itself was suffering from the invalid TLB bug (the first > cacheline was broken with the first two words reversed). Time to try a > fresh approach. This extends the workaround to write into each page of > our scratch buffer in order to overflow the TLB and evict the invalid > entries. This could be refined to only do so after we update the GTT, > but for simplicity, we do it before each batch.
This seems to hold up under scruting, so far at least. So I am more convinced that this effectively does the right thing. -Chris -- Chris Wilson, Intel Open Source Technology Centre -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
