linux-kernel - Re: CXL memory device not created correctly

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Message-ID: <20230519163758.000044dc@Huawei.com>
Date:   Fri, 19 May 2023 16:37:58 +0100
From:   Jonathan Cameron <Jonathan.Cameron@...wei.com>
To:     Ira Weiny <ira.weiny@...el.com>
CC:     Davidlohr Bueso <dave@...olabs.net>, LiuLele <liu.lele@...com>,
        <dave.jiang@...el.com>, <alison.schofield@...el.com>,
        <bhelgaas@...gle.com>, <bwidawsk@...nel.org>,
        <dan.j.williams@...el.com>, <helgaas@...nel.org>,
        <linux-acpi@...r.kernel.org>, <linux-cxl@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-pci@...r.kernel.org>,
        <rostedt@...dmis.org>, <vishal.l.verma@...el.com>
Subject: Re: CXL memory device not created correctly

On Fri, 19 May 2023 08:20:44 -0700
Ira Weiny <ira.weiny@...el.com> wrote:

> Davidlohr Bueso wrote:
> > On Fri, 19 May 2023, LiuLele wrote:
> >   
> > >In my testing CXL device /sys/bus/cxl/devices/mem0  not created, and the get error messages :
> > >
> > >```
> > >cxl_pci 0000:0d:00.0: Failed to get interrupt for event Info log
> > >```
> > >
> > >My test environment is a qemu CXL emulator with qemu v8.0.0, Linux kernel v6.3.0.
> > >While with kernel 5.9.13,  /sys/bus/cxl/devices/mem0  can be created.  
> > 
> > Yes, this can be annoying and would argue the probe should not error out.  
> 
> I had to double check.  Events are mandatory on devices.  On checking
> again interrupt support is mandatory as well.  So that is why I errored
> out here.  With real HW this should not be an issue.
> 
> > Regardless, the actual qemu support is in Jonathan's tree:
> > 
> > https://gitlab.com/jic23/qemu/-/commit/a04e6476df363d1f6bc160577b30dda6564d3f67  
> 
> That is the commit you need but it is probably best to use one of
> Jonathans 'official' branches.  Looks like he just pushed a new one today.
> 
> https://gitlab.com/jic23/qemu/-/tree/cxl-2023-05-19

Leave that one for now.  It was to get the CI tests to run. I need to tidy up
a bit and will announce when I have a clean one...

> 
> I've not run that one yet.  So if you have issues try his previous one it
> is working well for me.
> 
> https://gitlab.com/jic23/qemu/-/tree/cxl-2023-04-19

That one should be good to go still I think

Jonathan

> 
> Ira
> 
> > 
> > Thanks,
> > Davidlohr  
> 
>