linux-kernel - Re: [PATCH 1/2] irqdomain: Simple NUMA awareness.

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Message-Id: <20120526011045.A14583E22C3@localhost>
Date:	Fri, 25 May 2012 19:10:45 -0600
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Paul Mundt <lethal@...ux-sh.org>
Cc:	linux-sh@...r.kernel.org, linux-kernel@...r.kernel.org,
	Paul Mundt <lethal@...ux-sh.org>
Subject: Re: [PATCH 1/2] irqdomain: Simple NUMA awareness.

On Mon, 21 May 2012 14:06:31 +0900, Paul Mundt <lethal@...ux-sh.org> wrote:
> 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>

Queued for v3.6, Thanks.

g.

> ---
>  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
> 

-- 
Grant Likely, B.Sc, P.Eng.
Secret Lab Technologies, Ltd.
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