The following commit has been merged into the irq/drivers branch of tip:
Commit-ID: 01cbc389161fe5a679cc87cc8011a41342e94aaf
Gitweb: https://git.kernel.org/tip/01cbc389161fe5a679cc87cc8011a41342e94aaf
Author: Anup Patel <apatel@xxxxxxxxxxxxxxxx>
AuthorDate: Mon, 17 Feb 2025 14:26:51 +05:30
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitterDate: Tue, 18 Feb 2025 09:51:01 +01:00
genirq: Introduce irq_can_move_in_process_context()
Interrupt controller drivers which enable CONFIG_GENERIC_PENDING_IRQ
require to know whether an interrupt can be moved in process context or not
to decide whether they need to invoke the work around for non-atomic MSI
updates or not.
This information can be retrieved via irq_can_move_pcntxt(). That helper
requires access to the top-most interrupt domain data, but the driver which
requires this is usually further down in the hierarchy.
Introduce irq_can_move_in_process_context() which retrieves that
information from the top-most interrupt domain data.
[ tglx: Massaged change log ]
Signed-off-by: Anup Patel <apatel@xxxxxxxxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/all/20250217085657.789309-6-apatel@xxxxxxxxxxxxxxxx
---
include/linux/irq.h | 2 ++
kernel/irq/migration.c | 10 ++++++++++
2 files changed, 12 insertions(+)
diff --git a/include/linux/irq.h b/include/linux/irq.h
index 56f6583..dd5df1e 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -615,6 +615,7 @@ extern int irq_affinity_online_cpu(unsigned int cpu);
#endif
#if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_PENDING_IRQ)
+bool irq_can_move_in_process_context(struct irq_data *data);
void __irq_move_irq(struct irq_data *data);
static inline void irq_move_irq(struct irq_data *data)
{
@@ -623,6 +624,7 @@ static inline void irq_move_irq(struct irq_data *data)
}
void irq_move_masked_irq(struct irq_data *data);
#else
+static inline bool irq_can_move_in_process_context(struct irq_data *data) { return true; }
static inline void irq_move_irq(struct irq_data *data) { }
static inline void irq_move_masked_irq(struct irq_data *data) { }
#endif
diff --git a/kernel/irq/migration.c b/kernel/irq/migration.c
index e110300..147cabb 100644
--- a/kernel/irq/migration.c
+++ b/kernel/irq/migration.c
@@ -127,3 +127,13 @@ void __irq_move_irq(struct irq_data *idata)
if (!masked)
idata->chip->irq_unmask(idata);
}
+
+bool irq_can_move_in_process_context(struct irq_data *data)
+{
+ /*
+ * Get the top level irq_data in the hierarchy, which is optimized
+ * away when CONFIG_IRQ_DOMAIN_HIERARCHY is disabled.
+ */
+ data = irq_desc_get_irq_data(irq_data_to_desc(data));
+ return irq_can_move_pcntxt(data);
+}
|