PCI: improve discovery/configuration messages

This makes PCI resource management messages more consistent and adds a few
new messages to aid debugging.

Whenever we assign resources to a device, update a BAR, or change a
bridge aperture, it's worth noting it.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

1 files changed, 32 insertions, 28 deletions

diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c
index 357ca5c5460..7d678bb15ff 100644
--- a/drivers/pci/setup-res.c
+++ b/drivers/pci/setup-res.c
@@ -51,12 +51,6 @@ void pci_update_resource(struct pci_dev *dev, int resno)
 
 	pcibios_resource_to_bus(dev, &region, res);
 
-	dev_dbg(&dev->dev, "BAR %d: got res %pR bus [%#llx-%#llx] "
-		"flags %#lx\n", resno, res,
-		 (unsigned long long)region.start,
-		 (unsigned long long)region.end,
-		 (unsigned long)res->flags);
-
 	new = region.start | (res->flags & PCI_REGION_FLAG_MASK);
 	if (res->flags & IORESOURCE_IO)
 		mask = (u32)PCI_BASE_ADDRESS_IO_MASK;
@@ -91,9 +85,9 @@ void pci_update_resource(struct pci_dev *dev, int resno)
 		}
 	}
 	res->flags &= ~IORESOURCE_UNSET;
-	dev_dbg(&dev->dev, "BAR %d: moved to %pR (bus addr [%#llx-%#llx])\n",
-		resno, res, (unsigned long long)region.start,
-		(unsigned long long)region.end);
+	dev_info(&dev->dev, "BAR %d: set to %pR (PCI address [%#llx-%#llx]\n",
+		 resno, res, (unsigned long long)region.start,
+		 (unsigned long long)region.end);
 }
 
 int pci_claim_resource(struct pci_dev *dev, int resource)
@@ -103,20 +97,17 @@ int pci_claim_resource(struct pci_dev *dev, int resource)
 	int err;
 
 	root = pci_find_parent_resource(dev, res);
-
-	err = -EINVAL;
-	if (root != NULL)
-		err = request_resource(root, res);
-
-	if (err) {
-		const char *dtype = resource < PCI_BRIDGE_RESOURCES ? "device" : "bridge";
-		dev_err(&dev->dev, "BAR %d: %s of %s %pR\n",
-			resource,
-			root ? "address space collision on" :
-				"no parent found for",
-			dtype, res);
+	if (!root) {
+		dev_err(&dev->dev, "no compatible bridge window for %pR\n",
+			res);
+		return -EINVAL;
 	}
 
+	err = request_resource(root, res);
+	if (err)
+		dev_err(&dev->dev,
+			"address space collision: %pR already in use\n", res);
+
 	return err;
 }
 EXPORT_SYMBOL(pci_claim_resource);
@@ -124,7 +115,7 @@ EXPORT_SYMBOL(pci_claim_resource);
 #ifdef CONFIG_PCI_QUIRKS
 void pci_disable_bridge_window(struct pci_dev *dev)
 {
-	dev_dbg(&dev->dev, "Disabling bridge window.\n");
+	dev_info(&dev->dev, "disabling bridge mem windows\n");
 
 	/* MMIO Base/Limit */
 	pci_write_config_dword(dev, PCI_MEMORY_BASE, 0x0000fff0);
@@ -165,6 +156,7 @@ static int __pci_assign_resource(struct pci_bus *bus, struct pci_dev *dev,
 
 	if (!ret) {
 		res->flags &= ~IORESOURCE_STARTALIGN;
+		dev_info(&dev->dev, "BAR %d: assigned %pR\n", resno, res);
 		if (resno < PCI_BRIDGE_RESOURCES)
 			pci_update_resource(dev, resno);
 	}
@@ -178,10 +170,11 @@ int pci_assign_resource(struct pci_dev *dev, int resno)
 	resource_size_t align;
 	struct pci_bus *bus;
 	int ret;
+	char *type;
 
 	align = pci_resource_alignment(dev, res);
 	if (!align) {
-		dev_info(&dev->dev, "BAR %d: can't allocate %pR "
+		dev_info(&dev->dev, "BAR %d: can't assign %pR "
 			 "(bogus alignment)\n", resno, res);
 		return -EINVAL;
 	}
@@ -197,9 +190,20 @@ int pci_assign_resource(struct pci_dev *dev, int resno)
 		break;
 	}
 
-	if (ret)
-		dev_info(&dev->dev, "BAR %d: can't allocate %pR\n",
-			 resno, res);
+	if (ret) {
+		if (res->flags & IORESOURCE_MEM)
+			if (res->flags & IORESOURCE_PREFETCH)
+				type = "mem pref";
+			else
+				type = "mem";
+		else if (res->flags & IORESOURCE_IO)
+			type = "io";
+		else
+			type = "unknown";
+		dev_info(&dev->dev,
+			 "BAR %d: can't assign %s (size %#llx)\n",
+			 resno, type, (unsigned long long) resource_size(res));
+	}
 
 	return ret;
 }
@@ -272,8 +276,8 @@ int pci_enable_resources(struct pci_dev *dev, int mask)
 			continue;
 
 		if (!r->parent) {
-			dev_err(&dev->dev, "device not available because of "
-				"BAR %d %pR collisions\n", i, r);
+			dev_err(&dev->dev, "device not available "
+				"(can't reserve %pR)\n", r);
 			return -EINVAL;
 		}