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Date: Fri, 15 Apr 2011 16:17:55 -0400
From: Neil Horman <nhorman@...driver.com>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, nhorman <nhorman@...el2.think-freely.org>,
Dimitris Michailidis <dm@...lsio.com>,
Thomas Gleixner <tglx@...utronix.de>,
David Howells <dhowells@...hat.com>,
Eric Dumazet <eric.dumazet@...il.com>,
Tom Herbert <therbert@...gle.com>
Subject: [PATCH 1/3] irq: Add registered affinity guidance infrastructure
From: nhorman <nhorman@...el2.think-freely.org>
This patch adds the needed data to the irq_desc struct, as well as the needed
API calls to allow the requester of an irq to register a handler function to
determine the affinity_hint of that irq when queried from user space.
Signed-offy-by: Neil Horman <nhorman@...driver.com>
CC: Dimitris Michailidis <dm@...lsio.com>
CC: "David S. Miller" <davem@...emloft.net>
CC: Thomas Gleixner <tglx@...utronix.de>
CC: David Howells <dhowells@...hat.com>
CC: Eric Dumazet <eric.dumazet@...il.com>
CC: Tom Herbert <therbert@...gle.com>
---
include/linux/interrupt.h | 38 +++++++++++++++++++++++++++++++++++++-
include/linux/irq.h | 9 +++++++++
include/linux/irqdesc.h | 4 ++++
kernel/irq/Kconfig | 12 +++++++++++-
kernel/irq/manage.c | 39 +++++++++++++++++++++++++++++++++++++++
kernel/irq/proc.c | 35 +++++++++++++++++++++++++++++++++++
6 files changed, 135 insertions(+), 2 deletions(-)
diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
index 59b72ca..6edb364 100644
--- a/include/linux/interrupt.h
+++ b/include/linux/interrupt.h
@@ -118,6 +118,17 @@ struct irqaction {
} ____cacheline_internodealigned_in_smp;
extern irqreturn_t no_action(int cpl, void *dev_id);
+#ifdef CONFIG_AFFINITY_UPDATE
+extern int setup_affinity_data(int irq, irq_affinity_init_t, void *);
+#else
+static inline int setup_affinity_data(int irq,
+ irq_affinity_init_t init, void *d)
+{
+ return 0;
+}
+#endif
+
+extern void free_irq(unsigned int, void *);
#ifdef CONFIG_GENERIC_HARDIRQS
extern int __must_check
@@ -125,6 +136,32 @@ request_threaded_irq(unsigned int irq, irq_handler_t handler,
irq_handler_t thread_fn,
unsigned long flags, const char *name, void *dev);
+#ifdef CONFIG_AFFINITY_UPDATE
+static inline int __must_check
+request_affinity_irq(unsigned int irq, irq_handler_t handler,
+ irq_handler_t thread_fn,
+ unsigned long flags, const char *name, void *dev,
+ irq_affinity_init_t af_init, void *af_priv)
+{
+ int rc;
+
+ rc = request_threaded_irq(irq, handler, thread_fn, flags, name, dev);
+ if (rc)
+ goto out;
+
+ if (af_init)
+ rc = setup_affinity_data(irq, af_init, af_priv);
+ if (rc)
+ free_irq(irq, dev);
+
+out:
+ return rc;
+}
+#else
+#define request_affinity_irq(irq, hnd, tfn, flg, nm, dev, init, priv) \
+ request_threaded_irq(irq, hnd, NULL, flg, nm, dev)
+#endif
+
static inline int __must_check
request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags,
const char *name, void *dev)
@@ -167,7 +204,6 @@ request_any_context_irq(unsigned int irq, irq_handler_t handler,
static inline void exit_irq_thread(void) { }
#endif
-extern void free_irq(unsigned int, void *);
struct device;
diff --git a/include/linux/irq.h b/include/linux/irq.h
index 1d3577f..4bff14f 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -30,6 +30,15 @@
struct irq_desc;
struct irq_data;
+struct affin_data {
+ void *priv;
+ char *affinity_alg;
+ void (*affin_update)(int irq, struct affin_data *ad);
+ void (*affin_cleanup)(int irq, struct affin_data *ad);
+};
+
+typedef int (*irq_affinity_init_t)(int, struct affin_data*, void *);
+
typedef void (*irq_flow_handler_t)(unsigned int irq,
struct irq_desc *desc);
typedef void (*irq_preflow_handler_t)(struct irq_data *data);
diff --git a/include/linux/irqdesc.h b/include/linux/irqdesc.h
index 0021837..14a22fb 100644
--- a/include/linux/irqdesc.h
+++ b/include/linux/irqdesc.h
@@ -64,6 +64,10 @@ struct irq_desc {
struct timer_rand_state *timer_rand_state;
unsigned int __percpu *kstat_irqs;
irq_flow_handler_t handle_irq;
+#ifdef CONFIG_AFFINITY_UPDATE
+ struct affin_data *af_data;
+#endif
+
#ifdef CONFIG_IRQ_PREFLOW_FASTEOI
irq_preflow_handler_t preflow_handler;
#endif
diff --git a/kernel/irq/Kconfig b/kernel/irq/Kconfig
index 09bef82..abaf19c 100644
--- a/kernel/irq/Kconfig
+++ b/kernel/irq/Kconfig
@@ -51,6 +51,17 @@ config IRQ_PREFLOW_FASTEOI
config IRQ_FORCED_THREADING
bool
+config AFFINITY_UPDATE
+ bool "Support irq affinity direction"
+ depends on GENERIC_HARDIRQS
+ ---help---
+
+ Affinity updating adds the ability for requestors of irqs to
+ register affinity update methods against the irq in question
+ in so doing the requestor can be informed every time user space
+ queries an irq for its optimal affinity, giving the requstor the
+ chance to tell user space where the irq can be optimally handled
+
config SPARSE_IRQ
bool "Support sparse irq numbering"
depends on HAVE_SPARSE_IRQ
@@ -64,6 +75,5 @@ config SPARSE_IRQ
out the interrupt descriptors in a more NUMA-friendly way. )
If you don't know what to do here, say N.
-
endmenu
endif
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index acd599a..257ea4d 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -1159,6 +1159,17 @@ static struct irqaction *__free_irq(unsigned int irq, void *dev_id)
unregister_handler_proc(irq, action);
+#ifdef CONFIG_AFFINITY_UPDATE
+ /*
+ * Have to do this after we unregister proc accessors
+ */
+ if (desc->af_data) {
+ if (desc->af_data->affin_cleanup)
+ desc->af_data->affin_cleanup(irq, desc->af_data);
+ kfree(desc->af_data);
+ desc->af_data = NULL;
+ }
+#endif
/* Make sure it's not being used on another CPU: */
synchronize_irq(irq);
@@ -1345,6 +1356,34 @@ int request_threaded_irq(unsigned int irq, irq_handler_t handler,
}
EXPORT_SYMBOL(request_threaded_irq);
+#ifdef CONFIG_AFFINITY_UPDATE
+int setup_affinity_data(int irq, irq_affinity_init_t af_init, void *af_priv)
+{
+ struct affin_data *data;
+ struct irq_desc *desc;
+ int rc;
+
+ desc = irq_to_desc(irq);
+ if (!desc)
+ return -ENOENT;
+
+ data = kzalloc(sizeof(struct affin_data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ rc = af_init(irq, data, af_priv);
+ if (rc) {
+ kfree(data);
+ return rc;
+ }
+
+ desc->af_data = data;
+
+ return 0;
+}
+EXPORT_SYMBOL(setup_affinity_data);
+#endif
+
/**
* request_any_context_irq - allocate an interrupt line
* @irq: Interrupt line to allocate
diff --git a/kernel/irq/proc.c b/kernel/irq/proc.c
index 4cc2e5e..8fecb05 100644
--- a/kernel/irq/proc.c
+++ b/kernel/irq/proc.c
@@ -42,6 +42,11 @@ static int irq_affinity_hint_proc_show(struct seq_file *m, void *v)
if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
return -ENOMEM;
+#ifdef CONFIG_AFFINITY_UPDATE
+ if (desc->af_data && desc->af_data->affin_update)
+ desc->af_data->affin_update((long)m->private, desc->af_data);
+#endif
+
raw_spin_lock_irqsave(&desc->lock, flags);
if (desc->affinity_hint)
cpumask_copy(mask, desc->affinity_hint);
@@ -54,6 +59,19 @@ static int irq_affinity_hint_proc_show(struct seq_file *m, void *v)
return 0;
}
+static int irq_affinity_alg_proc_show(struct seq_file *m, void *v)
+{
+ char *alg = "none";
+#ifdef CONFIG_AFFINITY_UPDATE
+ struct irq_desc *desc = irq_to_desc((long)m->private);
+
+ if (desc->af_data->affinity_alg)
+ alg = desc->af_data->affinity_alg;
+#endif
+ seq_printf(m, "%s\n", alg);
+ return 0;
+}
+
#ifndef is_affinity_mask_valid
#define is_affinity_mask_valid(val) 1
#endif
@@ -110,6 +128,11 @@ static int irq_affinity_hint_proc_open(struct inode *inode, struct file *file)
return single_open(file, irq_affinity_hint_proc_show, PDE(inode)->data);
}
+static int irq_affinity_alg_proc_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, irq_affinity_alg_proc_show, PDE(inode)->data);
+}
+
static const struct file_operations irq_affinity_proc_fops = {
.open = irq_affinity_proc_open,
.read = seq_read,
@@ -125,6 +148,13 @@ static const struct file_operations irq_affinity_hint_proc_fops = {
.release = single_release,
};
+static const struct file_operations irq_affinity_alg_proc_fops = {
+ .open = irq_affinity_alg_proc_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
static int default_affinity_show(struct seq_file *m, void *v)
{
seq_cpumask(m, irq_default_affinity);
@@ -288,6 +318,11 @@ void register_irq_proc(unsigned int irq, struct irq_desc *desc)
/* create /proc/irq/<irq>/affinity_hint */
proc_create_data("affinity_hint", 0400, desc->dir,
&irq_affinity_hint_proc_fops, (void *)(long)irq);
+#ifdef CONFIG_AFFINITY_UPDATE
+ /* Create /proc/irq/<irq>/affinity_alg */
+ proc_create_data("affinity_alg", 0400, desc->dir,
+ &irq_affinity_alg_proc_fops, (void *)(long)irq);
+#endif
proc_create_data("node", 0444, desc->dir,
&irq_node_proc_fops, (void *)(long)irq);
--
1.7.4.2
--
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