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cxl/acpi: Improve debug messages in cxl_acpi_probe() 

In cxl_acpi_probe() the iterator bus_for_each_dev() walks through all
CXL hosts. Since all dev_*() debug messages point to the ACPI0017
device which is the CXL root for all hosts, the device information is
pointless as it is always the same device. Change this to use the host
device for this instead.

Also, add additional host specific information such as CXL support,
UID and CHBCR.

This is an example log:

 acpi ACPI0016:00: UID found: 4
 acpi ACPI0016:00: CHBCR found: 0x28090000000
 acpi ACPI0016:00: dport added to root0
 acpi ACPI0016:00: host-bridge: ACPI0016:00
  pci0000:7f: host supports CXL

Signed-off-by: Robert Richter <rrichter@amd.com>
Link: https://lore.kernel.org/r/20221018132341.76259-6-rrichter@amd.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Robert Richter 2022-10-18 15:23:33 +02:00 committed by Dan Williams
parent 76f1911084
commit b51d767521
1 changed files with 8 additions and 4 deletions
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12
drivers/cxl/acpi.c
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@ -221,6 +221,8 @@ static int add_host_bridge_uport(struct device *match, void *arg)
if (IS_ERR(port))
return PTR_ERR(port);
dev_info(pci_root->bus->bridge, "host supports CXL\n");
return 0;
}
@ -264,11 +266,12 @@ static int add_host_bridge_dport(struct device *match, void *arg)
status = acpi_evaluate_integer(bridge->handle, METHOD_NAME__UID, NULL,
&uid);
if (status != AE_OK) {
dev_err(host, "unable to retrieve _UID of %s\n",
dev_name(match));
dev_err(match, "unable to retrieve _UID\n");
return -ENODEV;
}
dev_dbg(match, "UID found: %lld\n", uid);
ctx = (struct cxl_chbs_context) {
.dev = host,
.uid = uid,
@ -276,11 +279,12 @@ static int add_host_bridge_dport(struct device *match, void *arg)
acpi_table_parse_cedt(ACPI_CEDT_TYPE_CHBS, cxl_get_chbcr, &ctx);
if (ctx.chbcr == 0) {
dev_warn(host, "No CHBS found for Host Bridge: %s\n",
dev_name(match));
dev_warn(match, "No CHBS found for Host Bridge (UID %lld)\n", uid);
return 0;
}
dev_dbg(match, "CHBCR found: 0x%08llx\n", (u64)ctx.chbcr);
dport = devm_cxl_add_dport(root_port, match, uid, ctx.chbcr);
if (IS_ERR(dport))
return PTR_ERR(dport);