diff options
Diffstat (limited to 'target/linux/d1/patches-6.1/0011-genirq-Add-support-for-oneshot-safe-threaded-EOIs.patch')
| -rw-r--r-- | target/linux/d1/patches-6.1/0011-genirq-Add-support-for-oneshot-safe-threaded-EOIs.patch | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/target/linux/d1/patches-6.1/0011-genirq-Add-support-for-oneshot-safe-threaded-EOIs.patch b/target/linux/d1/patches-6.1/0011-genirq-Add-support-for-oneshot-safe-threaded-EOIs.patch new file mode 100644 index 0000000000..d8dd2878d1 --- /dev/null +++ b/target/linux/d1/patches-6.1/0011-genirq-Add-support-for-oneshot-safe-threaded-EOIs.patch @@ -0,0 +1,124 @@ +From ee6459d60f24d91052f0288155f44e6a7f991050 Mon Sep 17 00:00:00 2001 +From: Samuel Holland <samuel@sholland.org> +Date: Sat, 7 May 2022 18:34:25 -0500 +Subject: [PATCH 011/117] genirq: Add support for oneshot-safe threaded EOIs + +irqchips can use the combination of flags IRQCHIP_ONESHOT_SAFE | +IRQCHIP_EOI_THREADED to elide mask operations. + +Signed-off-by: Samuel Holland <samuel@sholland.org> +--- + kernel/irq/chip.c | 36 +++++++++++++++++------------------- + kernel/irq/internals.h | 2 +- + kernel/irq/manage.c | 12 ++++++------ + 3 files changed, 24 insertions(+), 26 deletions(-) + +--- a/kernel/irq/chip.c ++++ b/kernel/irq/chip.c +@@ -439,16 +439,6 @@ void unmask_irq(struct irq_desc *desc) + } + } + +-void unmask_threaded_irq(struct irq_desc *desc) +-{ +- struct irq_chip *chip = desc->irq_data.chip; +- +- if (chip->flags & IRQCHIP_EOI_THREADED) +- chip->irq_eoi(&desc->irq_data); +- +- unmask_irq(desc); +-} +- + /* + * handle_nested_irq - Handle a nested irq from a irq thread + * @irq: the interrupt number +@@ -656,25 +646,33 @@ out_unlock: + } + EXPORT_SYMBOL_GPL(handle_level_irq); + +-static void cond_unmask_eoi_irq(struct irq_desc *desc, struct irq_chip *chip) ++void unmask_eoi_threaded_irq(struct irq_desc *desc) + { +- if (!(desc->istate & IRQS_ONESHOT)) { ++ struct irq_chip *chip = desc->irq_data.chip; ++ ++ if (desc->istate & IRQS_ONESHOT) ++ unmask_irq(desc); ++ ++ if (chip->flags & IRQCHIP_EOI_THREADED) + chip->irq_eoi(&desc->irq_data); ++} ++ ++static void cond_unmask_eoi_irq(struct irq_desc *desc, struct irq_chip *chip) ++{ ++ /* Do not send EOI if the thread will do it for us. */ ++ if ((chip->flags & IRQCHIP_EOI_THREADED) && desc->threads_oneshot) + return; +- } ++ + /* + * We need to unmask in the following cases: + * - Oneshot irq which did not wake the thread (caused by a + * spurious interrupt or a primary handler handling it + * completely). + */ +- if (!irqd_irq_disabled(&desc->irq_data) && +- irqd_irq_masked(&desc->irq_data) && !desc->threads_oneshot) { +- chip->irq_eoi(&desc->irq_data); ++ if ((desc->istate & IRQS_ONESHOT) && !desc->threads_oneshot) + unmask_irq(desc); +- } else if (!(chip->flags & IRQCHIP_EOI_THREADED)) { +- chip->irq_eoi(&desc->irq_data); +- } ++ ++ chip->irq_eoi(&desc->irq_data); + } + + /** +--- a/kernel/irq/internals.h ++++ b/kernel/irq/internals.h +@@ -93,7 +93,7 @@ extern void irq_percpu_enable(struct irq + extern void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu); + extern void mask_irq(struct irq_desc *desc); + extern void unmask_irq(struct irq_desc *desc); +-extern void unmask_threaded_irq(struct irq_desc *desc); ++extern void unmask_eoi_threaded_irq(struct irq_desc *desc); + + #ifdef CONFIG_SPARSE_IRQ + static inline void irq_mark_irq(unsigned int irq) { } +--- a/kernel/irq/manage.c ++++ b/kernel/irq/manage.c +@@ -1074,9 +1074,9 @@ static int irq_wait_for_interrupt(struct + static void irq_finalize_oneshot(struct irq_desc *desc, + struct irqaction *action) + { +- if (!(desc->istate & IRQS_ONESHOT) || +- action->handler == irq_forced_secondary_handler) ++ if (action->handler == irq_forced_secondary_handler) + return; ++ + again: + chip_bus_lock(desc); + raw_spin_lock_irq(&desc->lock); +@@ -1112,9 +1112,8 @@ again: + + desc->threads_oneshot &= ~action->thread_mask; + +- if (!desc->threads_oneshot && !irqd_irq_disabled(&desc->irq_data) && +- irqd_irq_masked(&desc->irq_data)) +- unmask_threaded_irq(desc); ++ if (!desc->threads_oneshot) ++ unmask_eoi_threaded_irq(desc); + + out_unlock: + raw_spin_unlock_irq(&desc->lock); +@@ -1662,7 +1661,8 @@ __setup_irq(unsigned int irq, struct irq + * !ONESHOT irqs the thread mask is 0 so we can avoid a + * conditional in irq_wake_thread(). + */ +- if (new->flags & IRQF_ONESHOT) { ++ if ((new->flags & IRQF_ONESHOT) || ++ (desc->irq_data.chip->flags & (IRQCHIP_ONESHOT_SAFE | IRQCHIP_EOI_THREADED)) == (IRQCHIP_ONESHOT_SAFE | IRQCHIP_EOI_THREADED)) { + /* + * Unlikely to have 32 resp 64 irqs sharing one line, + * but who knows. |