From 7f072d94c93174d30eb18426ee8f8727a9081c40 Mon Sep 17 00:00:00 2001
From: Neil Horman <nhorman@tuxdriver.com>
Date: Fri, 16 May 2014 10:10:36 -0400
Subject: [PATCH] irqbalance: separate cmomand line banned irqs from listed
 banned irqs

irqbalance was using one list for tracking banned irqs, but the list was being
used for disperate pruposes in different places.  It was tracking command line
banned irqs and irqs that were banned via banscript and policyscript.  The
former needs to be remembered accross db rebuilds, while the latter needs to be
rebuilt every time.  This patch separates the two in to two lists, so that we
don't stop banning command line specified irqs after the first db rebuild.

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
---
 classify.c   | 38 +++++++++++++++++++++++++++++---------
 irqbalance.c |  2 +-
 irqbalance.h |  2 +-
 3 files changed, 31 insertions(+), 11 deletions(-)

diff --git a/classify.c b/classify.c
index 94b53b8..8c7d482 100644
--- a/classify.c
+++ b/classify.c
@@ -59,8 +59,9 @@ struct user_irq_policy {
 	int numa_node;
 };
 
-static GList *interrupts_db;
-static GList *banned_irqs;
+static GList *interrupts_db = NULL;
+static GList *banned_irqs = NULL;
+static GList *cl_banned_irqs = NULL;
 
 #define SYSDEV_DIR "/sys/bus/pci/devices"
 
@@ -72,13 +73,13 @@ static gint compare_ints(gconstpointer a, gconstpointer b)
 	return ai->irq - bi->irq;
 }
 
-void add_banned_irq(int irq)
+void add_banned_irq(int irq, GList **list)
 {
 	struct irq_info find, *new;
 	GList *entry;
 
 	find.irq = irq;
-	entry = g_list_find_custom(banned_irqs, &find, compare_ints);
+	entry = g_list_find_custom(*list, &find, compare_ints);
 	if (entry)
 		return;
 
@@ -91,10 +92,16 @@ void add_banned_irq(int irq)
 	new->irq = irq;
 	new->flags |= IRQ_FLAG_BANNED;
 
-	banned_irqs = g_list_append(banned_irqs, new);
+	*list = g_list_append(*list, new);
 	return;
 }
 
+void add_cl_banned_irq(int irq)
+{
+	add_banned_irq(irq, &cl_banned_irqs);
+}
+
+
 static int is_banned_irq(int irq)
 {
 	GList *entry;
@@ -324,10 +331,23 @@ static int check_for_irq_ban(char *path, int irq)
 {
 	char *cmd;
 	int rc;
+	struct irq_info find;
+	GList *entry;
+
+	/*
+	 * Check to see if we banned this irq on the command line
+	 */
+	find.irq = irq;
+	entry = g_list_find_custom(cl_banned_irqs, &find, compare_ints);
+	if (entry)
+		return 1;
 
 	if (!banscript)
 		return 0;
 
+	if (!path)
+		return 0;
+
 	cmd = alloca(strlen(path)+strlen(banscript)+32);
 	if (!cmd)
 		return 0;
@@ -382,7 +402,7 @@ static void build_one_dev_entry(const char *dirname)
 					continue;
 				get_irq_user_policy(devpath, irqnum, &pol);
 				if ((pol.ban == 1) || (check_for_irq_ban(devpath, irqnum))) {
-					add_banned_irq(irqnum);
+					add_banned_irq(irqnum, &banned_irqs);
 					continue;
 				}
 				new = add_one_irq_to_db(devpath, irqnum, &pol);
@@ -411,7 +431,7 @@ static void build_one_dev_entry(const char *dirname)
 			goto done;
 		get_irq_user_policy(devpath, irqnum, &pol);
 		if ((pol.ban == 1) || (check_for_irq_ban(path, irqnum))) {
-			add_banned_irq(irqnum);
+			add_banned_irq(irqnum, &banned_irqs);
 			goto done;
 		}
 
@@ -497,8 +517,8 @@ struct irq_info *add_new_irq(int irq, struct irq_info *hint)
 		return NULL;
 
 	get_irq_user_policy("/sys", irq, &pol);
-	if (pol.ban == 1) {
-		add_banned_irq(irq);
+	if ((pol.ban == 1) || check_for_irq_ban(NULL, irq)) {
+		add_banned_irq(irq, &banned_irqs);
 		new = get_irq_info(irq);
 	} else
 		new = add_one_irq_to_db("/sys", irq, &pol);
diff --git a/irqbalance.c b/irqbalance.c
index 2532242..e0b3cbe 100644
--- a/irqbalance.c
+++ b/irqbalance.c
@@ -151,7 +151,7 @@ static void parse_command_line(int argc, char **argv)
 					usage();
 					exit(1);
 				}
-				add_banned_irq((int)val);
+				add_cl_banned_irq((int)val);
 				break;
 			case 'l':
 				polscript = strdup(optarg);
diff --git a/irqbalance.h b/irqbalance.h
index 04cf9d8..cb648a5 100644
--- a/irqbalance.h
+++ b/irqbalance.h
@@ -106,7 +106,7 @@ extern int get_cpu_count(void);
  */
 extern void rebuild_irq_db(void);
 extern void free_irq_db(void);
-extern void add_banned_irq(int irq);
+extern void add_cl_banned_irq(int irq);
 extern void for_each_irq(GList *list, void (*cb)(struct irq_info *info,  void *data), void *data);
 extern struct irq_info *get_irq_info(int irq);
 extern void migrate_irq(GList **from, GList **to, struct irq_info *info);
-- 
2.4.3