[Intel-gfx] [PATCH 3/3] [v3] intel_error_decode: Fix ACTHD/HEAD mess with libdrm

[Ben Widawsky]

On Tue, Apr 23, 2013 at 09:30:33AM +0100, Chris Wilson wrote:
> On Mon, Apr 22, 2013 at 06:11:12PM -0700, Ben Widawsky wrote:
> > This patch is an enormous mess, and I'd be fine if people didn't want
> > it. However I have made the code do what we want at least on the two
> > error dumps I've tried.
> > 
> > The way that it works is it attempts to identify which ACTHD belongs to
> > the ring, or batch, and add the appropriate offset as necessary so the
> > libdrm decoder can do the right thing.
> > 
> > What I do is put each ACTHD in a fixed part of the array, and assume the
> > error dump will dump each ring in gtt ascending order (ie. RCS offset <
> > VCS offset < BCS offset). I know, its hacky.
> > 
> > Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
> > ---
> 
> > +static void emit_acthd(struct drm_intel_decode *decode_ctx,
> > +		uint64_t gtt_offset, uint64_t size, int is_batch)
> > +{
> > +	/* XXX: This depends on always being in ascending gtt space order */
> > +	static int which_acthd = 0;
> 
> You have ring_name available to sort on.
> I would prefer the use of RING_HEAD when decoding the ringbuffers, so
> that the current HEAD is always printed there - acting like a frame
> pointer in a stacktrace. Making that distinction between rings and
> batches should make this code simplier.
> -Chris
> 
> -- 
> Chris Wilson, Intel Open Source Technology Centre

Any issue with me pushing the first 2, and stalling on this one?

-- 
Ben Widawsky, Intel Open Source Technology Center