irqdomain: Simple NUMA awareness.

While common irqdesc allocation is node aware, the irqdomain code is not.

Presently we observe a number of regressions/inconsistencies on
NUMA-capable platforms:

- Platforms using irqdomains with legacy mappings, where the
  irq_descs are allocated node-local and the irqdomain data
  structure is not.

- Drivers implementing irqdomains will lose node locality
  regardless of the underlying struct device's node id.

This plugs in NUMA node id proliferation across the various allocation
callsites by way of_node_to_nid() node lookup. While of_node_to_nid()
does the right thing for OF-capable platforms it doesn't presently handle
the non-DT case. This is trivially dealt with by simply wraping in to
numa_node_id() unconditionally.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

2 files changed, 18 insertions, 10 deletions

diff --git a/include/linux/of.h b/include/linux/of.h
index 1012377cae92..76930ee78db5 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -21,6 +21,7 @@
 #include <linux/kref.h>
 #include <linux/mod_devicetable.h>
 #include <linux/spinlock.h>
+#include <linux/topology.h>
 
 #include <asm/byteorder.h>
 #include <asm/errno.h>
@@ -158,11 +159,6 @@ static inline unsigned long of_read_ulong(const __be32 *cell, int size)
 
 #define OF_BAD_ADDR     ((u64)-1)
 
-#ifndef of_node_to_nid
-static inline int of_node_to_nid(struct device_node *np) { return -1; }
-#define of_node_to_nid of_node_to_nid
-#endif
-
 static inline const char* of_node_full_name(struct device_node *np)
 {
         return np ? np->full_name : "<no-node>";
@@ -412,6 +408,15 @@ static inline int of_machine_is_compatible(const char *compat)
         while (0)
 #endif /* CONFIG_OF */
 
+#ifndef of_node_to_nid
+static inline int of_node_to_nid(struct device_node *np)
+{
+        return numa_node_id();
+}
+
+#define of_node_to_nid of_node_to_nid
+#endif
+
 /**
  * of_property_read_bool - Findfrom a property
  * @np:         device node from which the property value is to be read.
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index 38c5eb839c92..79ae0ebb90ba 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -10,6 +10,7 @@
 #include <linux/mutex.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
+#include <linux/topology.h>
 #include <linux/seq_file.h>
 #include <linux/slab.h>
 #include <linux/smp.h>
@@ -45,7 +46,8 @@ static struct irq_domain *irq_domain_alloc(struct device_node *of_node,
 {
         struct irq_domain *domain;
 
-        domain = kzalloc(sizeof(*domain), GFP_KERNEL);
+        domain = kzalloc_node(sizeof(*domain), GFP_KERNEL,
+                              of_node_to_nid(of_node));
         if (WARN_ON(!domain))
                 return NULL;
 
@@ -229,7 +231,8 @@ struct irq_domain *irq_domain_add_linear(struct device_node *of_node,
         struct irq_domain *domain;
         unsigned int *revmap;
 
-        revmap = kzalloc(sizeof(*revmap) * size, GFP_KERNEL);
+        revmap = kzalloc_node(sizeof(*revmap) * size, GFP_KERNEL,
+                              of_node_to_nid(of_node));
         if (WARN_ON(!revmap))
                 return NULL;
 
@@ -367,7 +370,7 @@ unsigned int irq_create_direct_mapping(struct irq_domain *domain)
         BUG_ON(domain == NULL);
         WARN_ON(domain->revmap_type != IRQ_DOMAIN_MAP_NOMAP);
 
-        virq = irq_alloc_desc_from(1, 0);
+        virq = irq_alloc_desc_from(1, of_node_to_nid(domain->of_node));
         if (!virq) {
                 pr_debug("create_direct virq allocation failed\n");
                 return 0;
@@ -433,9 +436,9 @@ unsigned int irq_create_mapping(struct irq_domain *domain,
         hint = hwirq % nr_irqs;
         if (hint == 0)
                 hint++;
-        virq = irq_alloc_desc_from(hint, 0);
+        virq = irq_alloc_desc_from(hint, of_node_to_nid(domain->of_node));
         if (virq <= 0)
-                virq = irq_alloc_desc_from(1, 0);
+                virq = irq_alloc_desc_from(1, of_node_to_nid(domain->of_node));
         if (virq <= 0) {
                 pr_debug("-> virq allocation failed\n");
                 return 0;