Re: Fermi+ shader header docs

From: Robert Morell <rmorell-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
To: Ilia Mirkin <imirkin-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org>
Cc: "nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org"
	<nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org>,
	gpu-public-documentation
	<gpu-public-documentation-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
Subject: Re: Fermi+ shader header docs
Date: Thu, 21 May 2015 07:05:16 -0700	[thread overview]
Message-ID: <20150521140516.GA8516@morell.nvidia.com> (raw)
In-Reply-To: <CAKb7Uvj=oisrfyGoehZFLtzWD38Nx_j435K2uZ9O5S8RXFayBw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>

Hi Ilia,

On Sat, May 02, 2015 at 12:34:21PM -0400, Ilia Mirkin wrote:
> Hi,
> 
> As I'm looking to add some support to nouveau for features like atomic
> counters and images, I'm running into some confusion about what the
> first word of the shader header means. Here is the definition as we
> have it today:

[...]

> However I know that these are somewhat wrong. I've seen shaders that
> use gmem accesses (i.e. mov r0, [r0]) that just have the LMEM enable
> bit set (and they use no lmem). And I've seen additional bits set, esp
> relating to images, but I haven't spent enough time looking at all the
> variations to make sense of it yet. For example, I think that Fermi
> and Kepler+ have different meanings for some of the bits.

Those look pretty close :)

> I was hoping you could just release the docs for the shader headers,
> or at least the first word of the shader header.

We've posted the specification for the full Shader Program Header to our
GPU documentation site here:

ftp://download.nvidia.com/open-gpu-doc/Shader-Program-Header/1/Shader-Program-Header.html

I hope it helps clear things up.

- Robert
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