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Date: Mon, 21 May 2012 14:06:31 +0900 From: Paul Mundt <lethal@...ux-sh.org> To: Grant Likely <grant.likely@...retlab.ca> Cc: linux-sh@...r.kernel.org, linux-kernel@...r.kernel.org, Paul Mundt <lethal@...ux-sh.org> Subject: [PATCH 1/2] 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@...ux-sh.org> --- include/linux/of.h | 16 ++++++++++------ kernel/irq/irqdomain.c | 13 ++++++++----- 2 files changed, 18 insertions(+), 11 deletions(-) diff --git a/include/linux/of.h b/include/linux/of.h index fa7fb1d..8650544 100644 --- a/include/linux/of.h +++ b/include/linux/of.h @@ -21,7 +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 +158,6 @@ 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 - extern struct device_node *of_find_node_by_name(struct device_node *from, const char *name); #define for_each_node_by_name(dn, name) \ @@ -351,6 +346,15 @@ static inline int of_machine_is_compatible(const char *compat) #define of_match_node(_matches, _node) NULL #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 41c1564..9e99054 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; -- 1.7.9.rc0.28.g0e1cf -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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