Re: [RFC PATCH 7/9] cxl/test: Add generic mock events

From: Ira Weiny
Date: Tue Sep 27 2022 - 12:14:15 EST


On Tue, Sep 27, 2022 at 02:56:23PM +0100, Jonathan Cameron wrote:
> On Mon, 26 Sep 2022 14:39:52 -0700
> Ira Weiny <ira.weiny@xxxxxxxxx> wrote:
>
> > On Tue, Sep 20, 2022 at 09:17:48AM -0700, Jonathan Cameron wrote:
> > > On Thu, 15 Sep 2022 11:53:29 -0700
> > > Ira Weiny <ira.weiny@xxxxxxxxx> wrote:
> > >
> > > > On Thu, Aug 25, 2022 at 12:31:19PM +0100, Jonathan Cameron wrote:
> > > > > On Fri, 12 Aug 2022 22:32:41 -0700
> > > > > ira.weiny@xxxxxxxxx wrote:
> > > > >
> > > > > > From: Ira Weiny <ira.weiny@xxxxxxxxx>
> > > > > >
> > > > > > Facilitate testing basic Get/Clear Event functionality by creating
> > > > > > multiple logs and generic events with made up UUID's.
> > > > > >
> > > > > > Data is completely made up with data patterns which should be easy to
> > > > > > spot in trace output.
> > > > > Hi Ira,
> > > > >
> > > > > I'm tempted to hack the QEMU emulation for this in with appropriately
> > > > > complex interface to inject all the record types...
> > > >
> > > > Every time I look at the QEMU code it makes my head spin. :-(
> > >
> > > You get used to it ;)`
> >
> > I'm trying... :-/
> >
> > Question though:
> >
> > Is there a call in qemu which is equivalent to cpu_to_leXX()? The
> > exec/cpu-all.h is having compilation issues for me because the
> > TARGET_BIG_ENDIAN is not defined (it is defined in a meson generated header).
> >
> > So I'm afraid that the tswapXX() calls are not what I'm supposed to use. Is
> > this true? Are those some sort of internal call?
> I'm confused. There is cpu_to_le16 in "qemu/bswap.h"

<sigh> I don't know how I missed it. Sorry.

>
> I suspect we've played a bit fast and loose with endianness in a few places in
> current qemu code and should probably check all that sometime.

Yea nothing in hw/cxl seems to use any swapping. I suppose only little endian
hosts have been used thus far?

I greped for 'ENDIAN' and found the tswap* calls. I guess I should have
grepped for 'cpu_to'! That found it right away! :-/ :-D

Sorry for the distraction,
Ira

> Jonathan
>
>
>
> >
> > Ira
>