PCI/AER: Consolidate Error Source ID logging in aer_isr_one_error_type()

Previously we decoded the AER Error Source ID in aer_isr_one_error_type(),
then again in find_source_device() if we didn't find any devices with
errors logged in their AER Capabilities.

Consolidate this so we only decode and log the Error Source ID once in
aer_isr_one_error_type().  Add a "found" parameter so we can add a note
when we didn't find any downstream devices with errors logged in their AER
Capability.

This changes the dmesg logging when we found no devices with errors logged:

  - pci 0000:00:01.0: AER: Correctable error message received from 0000:02:00.0
  - pci 0000:00:01.0: AER: found no error details for 0000:02:00.0
  + pci 0000:00:01.0: AER: Correctable error message received from 0000:02:00.0 (no details found)

Signed-off-by: Bjorn Helgaas <[email protected]>
Reviewed-by: Jonathan Cameron <[email protected]>
Reviewed-by: Kuppuswamy Sathyanarayanan <[email protected]>
Reviewed-by: Ilpo Järvinen <[email protected]>
Link: https://patch.msgid.link/[email protected]

Author: bjorn-helgaas

drivers/pci/pcie/aer.c

@@ -733,16 +733,17 @@ void aer_print_error(struct pci_dev *dev, struct aer_err_info *info)
 			info->severity, info->tlp_header_valid, &info->tlp);
 }
 
-static void aer_print_port_info(struct pci_dev *dev, struct aer_err_info *info)
+static void aer_print_port_info(struct pci_dev *dev, struct aer_err_info *info,
+				bool found)
 {
 	u8 bus = info->id >> 8;
 	u8 devfn = info->id & 0xff;
 
-	pci_info(dev, "%s%s error message received from %04x:%02x:%02x.%d\n",
+	pci_info(dev, "%s%s error message received from %04x:%02x:%02x.%d%s\n",
 		 info->multi_error_valid ? "Multiple " : "",
 		 aer_error_severity_string[info->severity],
 		 pci_domain_nr(dev->bus), bus, PCI_SLOT(devfn),
-		 PCI_FUNC(devfn));
+		 PCI_FUNC(devfn), found ? "" : " (no details found");
 }
 
 #ifdef CONFIG_ACPI_APEI_PCIEAER
@@ -926,15 +927,8 @@ static bool find_source_device(struct pci_dev *parent,
 	else
 		pci_walk_bus(parent->subordinate, find_device_iter, e_info);
 
-	if (!e_info->error_dev_num) {
-		u8 bus = e_info->id >> 8;
-		u8 devfn = e_info->id & 0xff;
-
-		pci_info(parent, "found no error details for %04x:%02x:%02x.%d\n",
-			 pci_domain_nr(parent->bus), bus, PCI_SLOT(devfn),
-			 PCI_FUNC(devfn));
+	if (!e_info->error_dev_num)
 		return false;
-	}
 	return true;
 }
 
@@ -1281,9 +1275,11 @@ static inline void aer_process_err_devices(struct aer_err_info *e_info)
 static void aer_isr_one_error_type(struct pci_dev *root,
 				   struct aer_err_info *info)
 {
-	aer_print_port_info(root, info);
+	bool found;
 
-	if (find_source_device(root, info))
+	found = find_source_device(root, info);
+	aer_print_port_info(root, info, found);
+	if (found)
 		aer_process_err_devices(info);
 }