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cxl: Add a dev_dbg() when a decoder was added to a port

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Improve debugging by adding and unifying messages whenever a decoder
was added to a port. It is especially useful to get the decoder
mapping of the involved CXL host bridge or PCI device. This avoids a
complex lookup of the decoder/port/device mappings in sysfs.

Example log messages:

  cxl_acpi ACPI0017:00: decoder0.0 added to root0
  cxl_acpi ACPI0017:00: decoder0.1 added to root0
  ...
   pci0000:e0: decoder1.0 added to port1
   pci0000:e0: decoder1.1 added to port1
  ...
  cxl_mem mem0: decoder5.0 added to endpoint5
  cxl_mem mem0: decoder5.1 added to endpoint5

Signed-off-by: Robert Richter <rrichter@amd.com>
Reviewed-by: Gregory Price <gourry@gourry.net>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Alison Schofield <alison.schofield@intel.com>
Tested-by: Gregory Price <gourry@gourry.net>
Acked-by: Dan Williams <dan.j.williams@intel.com>
Link: https://patch.msgid.link/20250509150700.2817697-15-rrichter@amd.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
This commit is contained in:
Robert Richter 2025-05-09 17:06:59 +02:00 committed by Dave Jiang
parent d90acdf49e
commit 98a863fee2
2 changed files with 11 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/cxl/acpi.c
View File

@ -421,7 +421,15 @@ static int __cxl_parse_cfmws(struct acpi_cedt_cfmws *cfmws,
rc = cxl_decoder_add(cxld, target_map);
if (rc)
return rc;
return cxl_root_decoder_autoremove(dev, no_free_ptr(cxlrd));
rc = cxl_root_decoder_autoremove(dev, no_free_ptr(cxlrd));
if (rc)
return rc;
dev_dbg(root_port->dev.parent, "%s added to %s\n",
dev_name(&cxld->dev), dev_name(&root_port->dev));
return 0;
}
static int cxl_parse_cfmws(union acpi_subtable_headers *header, void *arg,

3
drivers/cxl/core/hdm.c
View File

@ -34,7 +34,8 @@ static int add_hdm_decoder(struct cxl_port *port, struct cxl_decoder *cxld,
if (rc)
return rc;
dev_dbg(&cxld->dev, "Added to port %s\n", dev_name(&port->dev));
dev_dbg(port->uport_dev, "%s added to %s\n",
dev_name(&cxld->dev), dev_name(&port->dev));
return 0;
}