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Message-ID: <168492249714.404.7171936178014634825.tip-bot2@tip-bot2>
Date: Wed, 24 May 2023 10:01:37 -0000
From: "tip-bot2 for Shanker Donthineni" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Shanker Donthineni <sdonthineni@...dia.com>,
Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
linux-kernel@...r.kernel.org, maz@...nel.org
Subject: [tip: irq/core] genirq: Use hlist for managing resend handlers
The following commit has been merged into the irq/core branch of tip:
Commit-ID: bc06a9e0874239cb6d4eebcb0ecd1a91ad9272db
Gitweb: https://git.kernel.org/tip/bc06a9e0874239cb6d4eebcb0ecd1a91ad9272db
Author: Shanker Donthineni <sdonthineni@...dia.com>
AuthorDate: Fri, 19 May 2023 08:49:00 -05:00
Committer: Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Wed, 24 May 2023 11:39:44 +02:00
genirq: Use hlist for managing resend handlers
The current implementation utilizes a bitmap for managing interrupt resend
handlers, which is allocated based on the SPARSE_IRQ/NR_IRQS macros.
However, this method may not efficiently utilize memory during runtime,
particularly when IRQ_BITMAP_BITS is large.
Address this issue by using an hlist to manage interrupt resend handlers
instead of relying on a static bitmap memory allocation. Additionally, a
new function, clear_irq_resend(), is introduced and called from
irq_shutdown to ensure a graceful teardown of the interrupt.
Signed-off-by: Shanker Donthineni <sdonthineni@...dia.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Link: https://lore.kernel.org/r/20230519134902.1495562-2-sdonthineni@nvidia.com
---
include/linux/irqdesc.h | 3 +++-
kernel/irq/chip.c | 1 +-
kernel/irq/internals.h | 2 ++-
kernel/irq/irqdesc.c | 2 ++-
kernel/irq/resend.c | 47 +++++++++++++++++++++++++---------------
5 files changed, 38 insertions(+), 17 deletions(-)
diff --git a/include/linux/irqdesc.h b/include/linux/irqdesc.h
index 844a8e3..d9451d4 100644
--- a/include/linux/irqdesc.h
+++ b/include/linux/irqdesc.h
@@ -102,6 +102,9 @@ struct irq_desc {
int parent_irq;
struct module *owner;
const char *name;
+#ifdef CONFIG_HARDIRQS_SW_RESEND
+ struct hlist_node resend_node;
+#endif
} ____cacheline_internodealigned_in_smp;
#ifdef CONFIG_SPARSE_IRQ
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 49e7bc8..2eac553 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -306,6 +306,7 @@ static void __irq_disable(struct irq_desc *desc, bool mask);
void irq_shutdown(struct irq_desc *desc)
{
if (irqd_is_started(&desc->irq_data)) {
+ clear_irq_resend(desc);
desc->depth = 1;
if (desc->irq_data.chip->irq_shutdown) {
desc->irq_data.chip->irq_shutdown(&desc->irq_data);
diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h
index 5fdc0b5..51fc8c4 100644
--- a/kernel/irq/internals.h
+++ b/kernel/irq/internals.h
@@ -113,6 +113,8 @@ irqreturn_t handle_irq_event(struct irq_desc *desc);
/* Resending of interrupts :*/
int check_irq_resend(struct irq_desc *desc, bool inject);
+void clear_irq_resend(struct irq_desc *desc);
+void irq_resend_init(struct irq_desc *desc);
bool irq_wait_for_poll(struct irq_desc *desc);
void __irq_wake_thread(struct irq_desc *desc, struct irqaction *action);
diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c
index 240e145..b401b89 100644
--- a/kernel/irq/irqdesc.c
+++ b/kernel/irq/irqdesc.c
@@ -415,6 +415,7 @@ static struct irq_desc *alloc_desc(int irq, int node, unsigned int flags,
desc_set_defaults(irq, desc, node, affinity, owner);
irqd_set(&desc->irq_data, flags);
kobject_init(&desc->kobj, &irq_kobj_type);
+ irq_resend_init(desc);
return desc;
@@ -581,6 +582,7 @@ int __init early_irq_init(void)
mutex_init(&desc[i].request_mutex);
init_waitqueue_head(&desc[i].wait_for_threads);
desc_set_defaults(i, &desc[i], node, NULL, NULL);
+ irq_resend_init(desc);
}
return arch_early_irq_init();
}
diff --git a/kernel/irq/resend.c b/kernel/irq/resend.c
index 0c46e9f..edec335 100644
--- a/kernel/irq/resend.c
+++ b/kernel/irq/resend.c
@@ -21,8 +21,9 @@
#ifdef CONFIG_HARDIRQS_SW_RESEND
-/* Bitmap to handle software resend of interrupts: */
-static DECLARE_BITMAP(irqs_resend, IRQ_BITMAP_BITS);
+/* hlist_head to handle software resend of interrupts: */
+static HLIST_HEAD(irq_resend_list);
+static DEFINE_RAW_SPINLOCK(irq_resend_lock);
/*
* Run software resends of IRQ's
@@ -30,18 +31,17 @@ static DECLARE_BITMAP(irqs_resend, IRQ_BITMAP_BITS);
static void resend_irqs(struct tasklet_struct *unused)
{
struct irq_desc *desc;
- int irq;
-
- while (!bitmap_empty(irqs_resend, nr_irqs)) {
- irq = find_first_bit(irqs_resend, nr_irqs);
- clear_bit(irq, irqs_resend);
- desc = irq_to_desc(irq);
- if (!desc)
- continue;
- local_irq_disable();
+
+ raw_spin_lock_irq(&irq_resend_lock);
+ while (!hlist_empty(&irq_resend_list)) {
+ desc = hlist_entry(irq_resend_list.first, struct irq_desc,
+ resend_node);
+ hlist_del_init(&desc->resend_node);
+ raw_spin_unlock(&irq_resend_lock);
desc->handle_irq(desc);
- local_irq_enable();
+ raw_spin_lock(&irq_resend_lock);
}
+ raw_spin_unlock_irq(&irq_resend_lock);
}
/* Tasklet to handle resend: */
@@ -49,8 +49,6 @@ static DECLARE_TASKLET(resend_tasklet, resend_irqs);
static int irq_sw_resend(struct irq_desc *desc)
{
- unsigned int irq = irq_desc_get_irq(desc);
-
/*
* Validate whether this interrupt can be safely injected from
* non interrupt context
@@ -70,16 +68,31 @@ static int irq_sw_resend(struct irq_desc *desc)
*/
if (!desc->parent_irq)
return -EINVAL;
- irq = desc->parent_irq;
}
- /* Set it pending and activate the softirq: */
- set_bit(irq, irqs_resend);
+ /* Add to resend_list and activate the softirq: */
+ raw_spin_lock(&irq_resend_lock);
+ hlist_add_head(&desc->resend_node, &irq_resend_list);
+ raw_spin_unlock(&irq_resend_lock);
tasklet_schedule(&resend_tasklet);
return 0;
}
+void clear_irq_resend(struct irq_desc *desc)
+{
+ raw_spin_lock(&irq_resend_lock);
+ hlist_del_init(&desc->resend_node);
+ raw_spin_unlock(&irq_resend_lock);
+}
+
+void irq_resend_init(struct irq_desc *desc)
+{
+ INIT_HLIST_NODE(&desc->resend_node);
+}
#else
+void clear_irq_resend(struct irq_desc *desc) {}
+void irq_resend_init(struct irq_desc *desc) {}
+
static int irq_sw_resend(struct irq_desc *desc)
{
return -EINVAL;
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