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 357ca5c54607..7d678bb15ffb 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;
                 }