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

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Date:   Fri, 19 May 2023 08:20:44 -0700
From:   Ira Weiny <ira.weiny@...el.com>
To:     Davidlohr Bueso <dave@...olabs.net>, LiuLele <liu.lele@...com>
CC:     <dave.jiang@...el.com>, <Jonathan.Cameron@...wei.com>,
        <alison.schofield@...el.com>, <bhelgaas@...gle.com>,
        <bwidawsk@...nel.org>, <dan.j.williams@...el.com>,
        <helgaas@...nel.org>, <ira.weiny@...el.com>,
        <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

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

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

Ira

> 
> Thanks,
> Davidlohr