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authorThomas Gleixner <tglx@linutronix.de>2023-06-26 11:05:49 +0200
committerThomas Gleixner <tglx@linutronix.de>2023-06-26 11:05:49 +0200
commitf121ab7f4ac32ed2aa51035534926f9507a8308b (patch)
treed17cd6dc29b64e6d681caa70424f3beacce21f14 /kernel/irq
parentgenirq: Use a maple tree for interrupt descriptor management (diff)
parentMerge branch irq/misc-6.5 into irq/irqchip-next (diff)
downloadlinux-f121ab7f4ac32ed2aa51035534926f9507a8308b.tar.xz
linux-f121ab7f4ac32ed2aa51035534926f9507a8308b.zip
Merge tag 'irqchip-6.5' of git://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms into irq/core
Pull irqchip updates from Marc Zyngier: - A number of Loogson/Loogarch fixes - Allow the core code to retrigger an interrupt that has fired while the same interrupt is being handled on another CPU, papering over a GICv3 architecture issue - Work around an integration problem on ASR8601, where the CPU numbering isn't representable in the GIC implementation... - Add some missing interrupt to the STM32 irqchip - A bunch of warning squashing triggered by W=1 builds Link: https://lore.kernel.org/r/20230623224345.3577134-1-maz@kernel.org
Diffstat (limited to 'kernel/irq')
-rw-r--r--kernel/irq/chip.c16
-rw-r--r--kernel/irq/debugfs.c2
-rw-r--r--kernel/irq/internals.h7
-rw-r--r--kernel/irq/irqdomain.c2
-rw-r--r--kernel/irq/msi.c4
5 files changed, 26 insertions, 5 deletions
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 2eac5532c3c8..ee8c0acf39df 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -693,8 +693,16 @@ void handle_fasteoi_irq(struct irq_desc *desc)
raw_spin_lock(&desc->lock);
- if (!irq_may_run(desc))
+ /*
+ * When an affinity change races with IRQ handling, the next interrupt
+ * can arrive on the new CPU before the original CPU has completed
+ * handling the previous one - it may need to be resent.
+ */
+ if (!irq_may_run(desc)) {
+ if (irqd_needs_resend_when_in_progress(&desc->irq_data))
+ desc->istate |= IRQS_PENDING;
goto out;
+ }
desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
@@ -716,6 +724,12 @@ void handle_fasteoi_irq(struct irq_desc *desc)
cond_unmask_eoi_irq(desc, chip);
+ /*
+ * When the race described above happens this will resend the interrupt.
+ */
+ if (unlikely(desc->istate & IRQS_PENDING))
+ check_irq_resend(desc, false);
+
raw_spin_unlock(&desc->lock);
return;
out:
diff --git a/kernel/irq/debugfs.c b/kernel/irq/debugfs.c
index bbcaac64038e..5971a66be034 100644
--- a/kernel/irq/debugfs.c
+++ b/kernel/irq/debugfs.c
@@ -133,6 +133,8 @@ static const struct irq_bit_descr irqdata_states[] = {
BIT_MASK_DESCR(IRQD_HANDLE_ENFORCE_IRQCTX),
BIT_MASK_DESCR(IRQD_IRQ_ENABLED_ON_SUSPEND),
+
+ BIT_MASK_DESCR(IRQD_RESEND_WHEN_IN_PROGRESS),
};
static const struct irq_bit_descr irqdesc_states[] = {
diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h
index 7bdb7507efb0..bdd35bb9c735 100644
--- a/kernel/irq/internals.h
+++ b/kernel/irq/internals.h
@@ -47,9 +47,12 @@ enum {
* detection
* IRQS_POLL_INPROGRESS - polling in progress
* IRQS_ONESHOT - irq is not unmasked in primary handler
- * IRQS_REPLAY - irq is replayed
+ * IRQS_REPLAY - irq has been resent and will not be resent
+ * again until the handler has run and cleared
+ * this flag.
* IRQS_WAITING - irq is waiting
- * IRQS_PENDING - irq is pending and replayed later
+ * IRQS_PENDING - irq needs to be resent and should be resent
+ * at the next available opportunity.
* IRQS_SUSPENDED - irq is suspended
* IRQS_NMI - irq line is used to deliver NMIs
* IRQS_SYSFS - descriptor has been added to sysfs
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index f34760a1e222..5bd01624e447 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -1915,6 +1915,8 @@ static void irq_domain_check_hierarchy(struct irq_domain *domain)
#endif /* CONFIG_IRQ_DOMAIN_HIERARCHY */
#ifdef CONFIG_GENERIC_IRQ_DEBUGFS
+#include "internals.h"
+
static struct dentry *domain_dir;
static void
diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c
index 7a97bcb086bf..b4c31a5c1147 100644
--- a/kernel/irq/msi.c
+++ b/kernel/irq/msi.c
@@ -542,7 +542,7 @@ fail:
return ret;
}
-#ifdef CONFIG_PCI_MSI_ARCH_FALLBACKS
+#if defined(CONFIG_PCI_MSI_ARCH_FALLBACKS) || defined(CONFIG_PCI_XEN)
/**
* msi_device_populate_sysfs - Populate msi_irqs sysfs entries for a device
* @dev: The device (PCI, platform etc) which will get sysfs entries
@@ -574,7 +574,7 @@ void msi_device_destroy_sysfs(struct device *dev)
msi_for_each_desc(desc, dev, MSI_DESC_ALL)
msi_sysfs_remove_desc(dev, desc);
}
-#endif /* CONFIG_PCI_MSI_ARCH_FALLBACK */
+#endif /* CONFIG_PCI_MSI_ARCH_FALLBACK || CONFIG_PCI_XEN */
#else /* CONFIG_SYSFS */
static inline int msi_sysfs_create_group(struct device *dev) { return 0; }
static inline int msi_sysfs_populate_desc(struct device *dev, struct msi_desc *desc) { return 0; }