powerpc/eeh: Improve debug messages around device addition

Also remove useless comment.
Signed-off-by: Sam Bobroff <sbobroff@linux.ibm.com>
Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/59db84f4bf94718a12f206bc923ac797d47e4cc1.1565930772.git.sbobroff@linux.ibm.com

arch/powerpc/kernel/eeh.c

@@ -1198,7 +1198,7 @@ void eeh_add_device_late(struct pci_dev *dev)
 	pdn = pci_get_pdn_by_devfn(dev->bus, dev->devfn);
 	edev = pdn_to_eeh_dev(pdn);
 	if (edev->pdev == dev) {
-		pr_debug("EEH: Already referenced !\n");
+		pr_debug("EEH: Device %s already referenced!\n", pci_name(dev));
 		return;
 	}
 

arch/powerpc/platforms/powernv/eeh-powernv.c

@@ -44,10 +44,7 @@ void pnv_pcibios_bus_add_device(struct pci_dev *pdev)
 	if (!pdev->is_virtfn)
 		return;
 
-	/*
-	 * The following operations will fail if VF's sysfs files
-	 * aren't created or its resources aren't finalized.
-	 */
+	pr_debug("%s: EEH: Setting up device %s.\n", __func__, pci_name(pdev));
 	eeh_add_device_early(pdn);
 	eeh_add_device_late(pdev);
 	eeh_sysfs_add_device(pdev);
@@ -364,6 +361,10 @@ static void *pnv_eeh_probe(struct pci_dn *pdn, void *data)
 	int ret;
 	int config_addr = (pdn->busno << 8) | (pdn->devfn);
 
+	pr_debug("%s: probing %04x:%02x:%02x.%01x\n",
+		__func__, hose->global_number, pdn->busno,
+		PCI_SLOT(pdn->devfn), PCI_FUNC(pdn->devfn));
+
 	/*
 	 * When probing the root bridge, which doesn't have any
 	 * subordinate PCI devices. We don't have OF node for
@@ -458,6 +459,11 @@ static void *pnv_eeh_probe(struct pci_dn *pdn, void *data)
 	/* Save memory bars */
 	eeh_save_bars(edev);
 
+	pr_debug("%s: EEH enabled on %02x:%02x.%01x PHB#%x-PE#%x\n",
+		__func__, pdn->busno, PCI_SLOT(pdn->devfn),
+		PCI_FUNC(pdn->devfn), edev->pe->phb->global_number,
+		edev->pe->addr);
+
 	return NULL;
 }
 

arch/powerpc/platforms/pseries/eeh_pseries.c

@@ -52,6 +52,8 @@ void pseries_pcibios_bus_add_device(struct pci_dev *pdev)
 	if (!pdev->is_virtfn)
 		return;
 
+	pr_debug("%s: EEH: Setting up device %s.\n", __func__, pci_name(pdev));
+
 	pdn->device_id  =  pdev->device;
 	pdn->vendor_id  =  pdev->vendor;
 	pdn->class_code =  pdev->class;
@@ -238,6 +240,10 @@ static void *pseries_eeh_probe(struct pci_dn *pdn, void *data)
 	int enable = 0;
 	int ret;
 
+	pr_debug("%s: probing %04x:%02x:%02x.%01x\n",
+		__func__, pdn->phb->global_number, pdn->busno,
+		PCI_SLOT(pdn->devfn), PCI_FUNC(pdn->devfn));
+
 	/* Retrieve OF node and eeh device */
 	edev = pdn_to_eeh_dev(pdn);
 	if (!edev || edev->pe)
@@ -281,7 +287,12 @@ static void *pseries_eeh_probe(struct pci_dn *pdn, void *data)
 
 	/* Enable EEH on the device */
 	ret = eeh_ops->set_option(&pe, EEH_OPT_ENABLE);
-	if (!ret) {
+	if (ret) {
+		pr_debug("%s: EEH failed to enable on %02x:%02x.%01x PHB#%x-PE#%x (code %d)\n",
+			__func__, pdn->busno, PCI_SLOT(pdn->devfn),
+			PCI_FUNC(pdn->devfn), pe.phb->global_number,
+			pe.addr, ret);
+	} else {
 		/* Retrieve PE address */
 		edev->pe_config_addr = eeh_ops->get_pe_addr(&pe);
 		pe.addr = edev->pe_config_addr;
@@ -297,11 +308,6 @@ static void *pseries_eeh_probe(struct pci_dn *pdn, void *data)
 		if (enable) {
 			eeh_add_flag(EEH_ENABLED);
 			eeh_add_to_parent_pe(edev);
-
-			pr_debug("%s: EEH enabled on %02x:%02x.%01x PHB#%x-PE#%x\n",
-				__func__, pdn->busno, PCI_SLOT(pdn->devfn),
-				PCI_FUNC(pdn->devfn), pe.phb->global_number,
-				pe.addr);
 		} else if (pdn->parent && pdn_to_eeh_dev(pdn->parent) &&
 			   (pdn_to_eeh_dev(pdn->parent))->pe) {
 			/* This device doesn't support EEH, but it may have an
@@ -310,6 +316,11 @@ static void *pseries_eeh_probe(struct pci_dn *pdn, void *data)
 			edev->pe_config_addr = pdn_to_eeh_dev(pdn->parent)->pe_config_addr;
 			eeh_add_to_parent_pe(edev);
 		}
+		pr_debug("%s: EEH %s on %02x:%02x.%01x PHB#%x-PE#%x (code %d)\n",
+			__func__, (enable ? "enabled" : "unsupported"),
+			pdn->busno, PCI_SLOT(pdn->devfn),
+			PCI_FUNC(pdn->devfn), pe.phb->global_number,
+			pe.addr, ret);
 	}
 
 	/* Save memory bars */