linux-kernel - RE: [PATCH v7 16/27] cxl/pci: Store the endpoint's Component Register mappings in struct cxl_dev

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Date:   Sun, 25 Jun 2023 10:38:26 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Terry Bowman <terry.bowman@....com>, <alison.schofield@...el.com>,
        <vishal.l.verma@...el.com>, <ira.weiny@...el.com>,
        <bwidawsk@...nel.org>, <dan.j.williams@...el.com>,
        <dave.jiang@...el.com>, <Jonathan.Cameron@...wei.com>,
        <linux-cxl@...r.kernel.org>
CC:     <terry.bowman@....com>, <rrichter@....com>,
        <linux-kernel@...r.kernel.org>, <bhelgaas@...gle.com>
Subject: RE: [PATCH v7 16/27] cxl/pci: Store the endpoint's Component
 Register mappings in struct cxl_dev_state

Terry Bowman wrote:
> From: Robert Richter <rrichter@....com>
> 
> Same as for ports and dports, also store the endpoint's Component
> Register mappings, use struct cxl_dev_state for that.
> 
> The Component Register base address @component_reg_phys is no longer
> used after the rework of the Component Register setup which now uses
> struct member @comp_map instead. Remove the base address.
> 
> Signed-off-by: Robert Richter <rrichter@....com>
> Signed-off-by: Terry Bowman <terry.bowman@....com>
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>

Starting with this patch my QEMU cxl configuration fails to probe the
device:

# cxl list -Miu
{
  "memdev":"mem0",
  "pmem_size":"512.00 MiB (536.87 MB)",
  "serial":"0",
  "host":"0000:35:00.0",
  "state":"disabled"
}

...the next patch changes where the failure occurs, but it still fails
and applying the rest of the patches does not fix the issue either. I
have not had the time to debug it. Please have a look and make sure that
at every step of this patch set the driver is still operational. I.e.
'git bisect' should never find this conversion in a broken state.

For now I will look at proceeding with patch 1-15.

The cxl bits of my QEMU config are:

  -object memory-backend-file,id=cxl-mem1,share=on,mem-path=cxl-window1,size=$cxl_backend_size
  -object memory-backend-file,id=cxl-label1,share=on,mem-path=cxl-label1,size=$cxl_label_size
  -device pxb-cxl,id=cxl.0,bus=pcie.0,bus_nr=52
  -device cxl-rp,id=rp0,bus=cxl.0,addr=0.0,chassis=0,slot=0,port=0
  -device cxl-type3,bus=rp0,memdev=cxl-mem1,id=cxl-pmem0,lsa=cxl-label1
  -M cxl-fmw.0.targets.0=cxl.0,cxl-fmw.0.size=4G