[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <63d310851dc19_ea222294b@dwillia2-xfh.jf.intel.com.notmuch>
Date: Thu, 26 Jan 2023 15:45:09 -0800
From: Dan Williams <dan.j.williams@...el.com>
To: Robert Richter <rrichter@....com>,
Alison Schofield <alison.schofield@...el.com>
CC: Vishal Verma <vishal.l.verma@...el.com>,
Ira Weiny <ira.weiny@...el.com>,
Ben Widawsky <bwidawsk@...nel.org>,
Dan Williams <dan.j.williams@...el.com>,
Jonathan Cameron <jonathan.cameron@...wei.com>,
<linux-cxl@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] cxl/mbox: Add debug messages for supported mailbox
commands
Robert Richter wrote:
> Hi Alison,
>
> On 22.01.23 21:39:33, Alison Schofield wrote:
> > On Thu, Jan 19, 2023 at 02:04:50PM +0100, Robert Richter wrote:
> > > Only unsupported mailbox commands are reported in debug messages. A
> > > list of supported commands is useful too. Change debug messages to
> > > also report the opcodes of supported commands.
> >
> > Hi Robert,
> > I wonder if you can get this info another way. When I try this
> > loading cxl_test today, I get 99 new messages. Is this going to
> > create too much noise with debug kernels?
>
> There are 26 commands supported by the driver, so I assume there are
> at least 4 cards in your system? To me the number of messages looks ok
> for a debug kernel. And, most kernels have dyndbg enabled allowing to
> enable only messages of interest? Esp. if card initialization fails
> there is no way to get this information from userland. The list of
> unsupported commands is of less use than the one for supported. That
> is the intention for the change.
The debug message looks ok to me, I will just note that there has been
consideration for exporting the enabled commands list via
CXL_MEM_QUERY_COMMANDS [1]. I wouldn't be opposed to someone enabling that
as well, just need to be clear with userspace that not all kernels will
populate that status.
[1]: http://lore.kernel.org/r/63b4ec4e37cc1_5178e2941d@dwillia2-xfh.jf.intel.com.notmuch
Powered by blists - more mailing lists