Re: Intel 965G: i915_dispatch_cmdbuffer failed (2.6.19-rc2)

[Keith Whitwell <keith@tungstengraphics.com>]

This is all a little confusing as the driver doesn't really use that 
path in normal operation except for a single command - MI_FLUSH, which 
is shared between the architectures.  In normal operation the hardware 
does the validation for us for the bulk of the command stream.  If there 
  were missing functionality in that ioctl, it would be failing 
everywhere, not just in this one case.

I guess the questions I'd have are
	- did the driver work before the kernel upgrade?
	- what path in userspace is seeing you end up in this ioctl?
	- and like Keith, what commands are you seeing?

The final question is interesting not because we want to extend the 
ioctl to cover those, but because it will give a clue how you ended up 
there in the first place.

Keith

Keith Packard wrote:
> On Tue, 2006-10-17 at 13:40 -0400, Ryan Richter wrote:
> 
>> So do I want something like
>>
>>
>> static int do_validate_cmd(int cmd)
>> {
>> 	return 1;
>> }
>>
>> in i915_dma.c?
> 
> that will certainly avoid any checks. Another alternative is to printk
> the cmd which fails validation so we can see what needs adding here.
> 
> 
> 
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