[patch 13/13] x86: PAT Patch to add PAT related debug prints

[venkatesh.pallipadi@intel.com]

[-- Attachment #1: debug_reserve_free_memtype.patch --]
[-- Type: text/plain, Size: 2920 bytes --]

Adds debug prints at critical code. Adds enough info in dmesg to allow us to
do effective first round of analysis of any issues that may result due to PAT
patch series.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>

Index: linux-2.6-x86.git/arch/x86/mm/pat.c
===================================================================
--- linux-2.6-x86.git.orig/arch/x86/mm/pat.c	2008-03-18 03:40:47.000000000 -0700
+++ linux-2.6-x86.git/arch/x86/mm/pat.c	2008-03-18 03:56:52.000000000 -0700
@@ -289,6 +289,7 @@
 		struct memtype *saved_ptr;
 
 		if (parse->start >= end) {
+			printk("New Entry\n");
 			list_add(&new_entry->nd, parse->nd.prev);
 			new_entry = NULL;
 			break;
@@ -338,6 +339,8 @@
 				break;
 			}
 
+			printk("Overlap at 0x%Lx-0x%Lx\n",
+			       saved_ptr->start, saved_ptr->end);
 			/* No conflict. Go ahead and add this new entry */
 			list_add(&new_entry->nd, saved_ptr->nd.prev);
 			new_entry = NULL;
@@ -388,6 +391,8 @@
 				break;
 			}
 
+			printk("Overlap at 0x%Lx-0x%Lx\n",
+			       saved_ptr->start, saved_ptr->end);
 			/* No conflict. Go ahead and add this new entry */
 			list_add(&new_entry->nd, &saved_ptr->nd);
 			new_entry = NULL;
@@ -396,6 +401,10 @@
 	}
 
 	if (err) {
+		printk(
+	"reserve_memtype failed 0x%Lx-0x%Lx, track %s, req %s\n",
+			start, end, cattr_name(new_entry->type),
+			cattr_name(req_type));
 		kfree(new_entry);
 		spin_unlock(&memtype_lock);
 		return err;
@@ -404,6 +413,19 @@
 	if (new_entry) {
 		/* No conflict. Not yet added to the list. Add to the tail */
 		list_add_tail(&new_entry->nd, &memtype_list);
+		printk("New Entry\n");
+  	}
+
+	if (ret_type) {
+		printk(
+	"reserve_memtype added 0x%Lx-0x%Lx, track %s, req %s, ret %s\n",
+			start, end, cattr_name(actual_type),
+			cattr_name(req_type), cattr_name(*ret_type));
+	} else {
+		printk(
+	"reserve_memtype added 0x%Lx-0x%Lx, track %s, req %s\n",
+			start, end, cattr_name(actual_type),
+			cattr_name(req_type));
 	}
 
 	spin_unlock(&memtype_lock);
@@ -440,6 +462,8 @@
 		printk(KERN_DEBUG "%s:%d freeing invalid memtype %Lx-%Lx\n",
 			current->comm, current->pid, start, end);
 	}
+
+	printk( "free_memtype request 0x%Lx-0x%Lx\n", start, end);
 	return err;
 }
 
Index: linux-2.6-x86.git/arch/x86/mm/ioremap.c
===================================================================
--- linux-2.6-x86.git.orig/arch/x86/mm/ioremap.c	2008-03-18 03:54:39.000000000 -0700
+++ linux-2.6-x86.git/arch/x86/mm/ioremap.c	2008-03-18 03:56:52.000000000 -0700
@@ -179,6 +179,10 @@
 		      new_prot_val == _PAGE_CACHE_WC)) ||
 		    (prot_val == _PAGE_CACHE_WC &&
 		     new_prot_val == _PAGE_CACHE_WB)) {
+			printk(
+		"ioremap error for 0x%lx-0x%lx, requested 0x%lx, got 0x%lx\n",
+				phys_addr, phys_addr + size,
+				prot_val, new_prot_val);
 			free_memtype(phys_addr, phys_addr + size);
 			return NULL;
 		}

--