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Subject: Re: questions on CONFIG_PPC_ADV_DEBUG_REGS, DBCR0_BRT, and
 DBCR0_ACTIVE_EVENTS
From: Scott Wood <scottwood@freescale.com>
To: shiva7 <sivasakthi7@outlook.com>
Date: Tue, 22 Apr 2014 17:31:36 -0500
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 <1398170592855-81732.post@n7.nabble.com>
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Cc: Chris Friesen <chris.friesen@genband.com>, linuxppc-dev@ozlabs.org,
 Dave Kleikamp <shaggy@linux.vnet.ibm.com>,
 Torez Smith <lnxtorez@linux.vnet.ibm.com>
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On Tue, 2014-04-22 at 05:43 -0700, shiva7 wrote:
> I have the same question as like above posted by Mr. Chirs. 

I had to google the subject to find what e-mail you were talking about
-- it was posted a year ago:

http://marc.info/?l=linuxppc-embedded&m=136572252330650&w=2

Next time please quote the e-mail if you're trying to revive a thread,
and keep the original poster on CC.

I've quoted it here:

> Sorry for the bunch of emails, I'm working on some new stuff and running 
> into issues.
> 
> For CONFIG_BOOKE it appears that DBCR0_ACTIVE_EVENTS includes DBCR0_ICMP 
> but not DBCR0_BRT.  Is that just because none of the code paths 
> currently using DBCR0_ACTIVE_EVENTS need to check DBCR0_BT?

Perhaps it was just an oversight.  I've CCed Dave Kleikamp and Torez
Smith, who added DBCR0_ACTIVE_EVENTS.

> Also, in sys_debug_setcontext() why does SIG_DBG_BRANCH_TRACING return 
> -EINVAL if CONFIG_PPC_ADV_DEBUG_REGS is set?  Would it not be possible 
> to use DBCR0_BRT?

Either nobody has gotten around to implementing it, or the semantics
are different in some way (if the semantics are even defined anywhere
-- I couldn't find any documentation).

-Scott