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From: Thomas Gleixner <tglx@linutronix.de>
To: LKML <linux-kernel@vger.kernel.org>
Cc: Marc Zyngier <marc.zyngier@arm.com>,
	Christoph Hellwig <hch@lst.de>, Ingo Molnar <mingo@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Jens Axboe <axboe@kernel.dk>, Keith Busch <keith.busch@intel.com>
Subject: [patch 49/55] genirq: Add force argument to irq_startup()
Date: Tue, 20 Jun 2017 01:37:49 +0200
Message-ID: <20170619235447.112094565@linutronix.de> (raw)
In-Reply-To: <20170619233700.547167146@linutronix.de>


[-- Attachment #0: genirq--Add-force-argument-to-irq_startup--.patch --]
[-- Type: text/plain, Size: 3468 bytes --]

In order to handle managed interrupts gracefully on irq_startup() so they
won't lose their assigned affinity, it's necessary to allow startups which
keep the interrupts in managed shutdown state, if none of the assigend CPUs
is online. This allows drivers to request interrupts w/o the CPUs being
online, which avoid online/offline churn in drivers.

Add a force argument which can override that decision and let only
request_irq() and enable_irq() allow the managed shutdown
handling. enable_irq() is required, because the interrupt might be
requested with IRQF_NOAUTOEN and enable_irq() invokes irq_startup() which
would then wreckage the assignment again. All other callers force startup
and potentially break the assigned affinity.

No functional change as this only adds the function argument.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 kernel/irq/autoprobe.c |    4 ++--
 kernel/irq/chip.c      |    4 ++--
 kernel/irq/internals.h |    9 ++++++++-
 kernel/irq/manage.c    |    4 ++--
 4 files changed, 14 insertions(+), 7 deletions(-)

--- a/kernel/irq/autoprobe.c
+++ b/kernel/irq/autoprobe.c
@@ -53,7 +53,7 @@ unsigned long probe_irq_on(void)
 			if (desc->irq_data.chip->irq_set_type)
 				desc->irq_data.chip->irq_set_type(&desc->irq_data,
 							 IRQ_TYPE_PROBE);
-			irq_startup(desc, false);
+			irq_startup(desc, IRQ_NORESEND, IRQ_START_FORCE);
 		}
 		raw_spin_unlock_irq(&desc->lock);
 	}
@@ -70,7 +70,7 @@ unsigned long probe_irq_on(void)
 		raw_spin_lock_irq(&desc->lock);
 		if (!desc->action && irq_settings_can_probe(desc)) {
 			desc->istate |= IRQS_AUTODETECT | IRQS_WAITING;
-			if (irq_startup(desc, false))
+			if (irq_startup(desc, IRQ_NORESEND, IRQ_START_FORCE))
 				desc->istate |= IRQS_PENDING;
 		}
 		raw_spin_unlock_irq(&desc->lock);
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -212,7 +212,7 @@ static int __irq_startup(struct irq_desc
 	return ret;
 }
 
-int irq_startup(struct irq_desc *desc, bool resend)
+int irq_startup(struct irq_desc *desc, bool resend, bool force)
 {
 	int ret = 0;
 
@@ -892,7 +892,7 @@ static void
 		irq_settings_set_norequest(desc);
 		irq_settings_set_nothread(desc);
 		desc->action = &chained_action;
-		irq_startup(desc, true);
+		irq_startup(desc, IRQ_RESEND, IRQ_START_FORCE);
 	}
 }
 
--- a/kernel/irq/internals.h
+++ b/kernel/irq/internals.h
@@ -66,7 +66,14 @@ extern int __irq_set_trigger(struct irq_
 extern void __disable_irq(struct irq_desc *desc);
 extern void __enable_irq(struct irq_desc *desc);
 
-extern int irq_startup(struct irq_desc *desc, bool resend);
+#define IRQ_RESEND	true
+#define IRQ_NORESEND	false
+
+#define IRQ_START_FORCE	true
+#define IRQ_START_COND	false
+
+extern int irq_startup(struct irq_desc *desc, bool resend, bool force);
+
 extern void irq_shutdown(struct irq_desc *desc);
 extern void irq_enable(struct irq_desc *desc);
 extern void irq_disable(struct irq_desc *desc);
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -509,7 +509,7 @@ void __enable_irq(struct irq_desc *desc)
 		 * time. If it was already started up, then irq_startup()
 		 * will invoke irq_enable() under the hood.
 		 */
-		irq_startup(desc, true);
+		irq_startup(desc, IRQ_RESEND, IRQ_START_COND);
 		break;
 	}
 	default:
@@ -1304,7 +1304,7 @@ static int
 		}
 
 		if (irq_settings_can_autoenable(desc)) {
-			irq_startup(desc, true);
+			irq_startup(desc, IRQ_RESEND, IRQ_START_COND);
 		} else {
 			/*
 			 * Shared interrupts do not go well with disabling

  parent reply index

Thread overview: 122+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-06-19 23:37 [patch 00/55] genirq: Debuggability, consolidation and managed affinities Thomas Gleixner
2017-06-19 23:37 ` [patch 01/55] x86/apic: Add name to irq chip Thomas Gleixner
2017-06-22 16:40   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 02/55] iommu/amd: " Thomas Gleixner
2017-06-21 15:51   ` Joerg Roedel
2017-06-22 16:40   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 03/55] iommu/vt-d: " Thomas Gleixner
2017-06-21 15:51   ` Joerg Roedel
2017-06-22 16:41   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 04/55] genirq/msi: Prevent overwriting domain name Thomas Gleixner
2017-06-22 16:41   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 05/55] genirq: Allow fwnode to carry name information only Thomas Gleixner
2017-06-22 16:42   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 06/55] x86/vector: Create named irq domain Thomas Gleixner
2017-06-22 16:42   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 07/55] x86/ioapic: " Thomas Gleixner
2017-06-22 16:43   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 08/55] x86/htirq: Create named domain Thomas Gleixner
2017-06-22 16:44   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 09/55] x86/uv: Create named irq domain Thomas Gleixner
2017-06-22 16:44   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 10/55] x86/msi: Provide new iommu irqdomain interface Thomas Gleixner
2017-06-22 16:45   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 11/55] iommu/vt-d: Use named irq domain interface Thomas Gleixner
2017-06-21 15:52   ` Joerg Roedel
2017-06-22 16:45   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 12/55] iommu/amd: " Thomas Gleixner
2017-06-21 15:52   ` Joerg Roedel
2017-06-22 16:46   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 13/55] x86/msi: Remove unused remap " Thomas Gleixner
2017-06-22 16:46   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 14/55] x86/msi: Create named irq domains Thomas Gleixner
2017-06-22 16:47   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 15/55] PCI: vmd: Create named irq domain Thomas Gleixner
2017-06-20 20:07   ` Keith Busch
2017-06-20 20:07     ` Thomas Gleixner
2017-06-20 20:39       ` Thomas Gleixner
2017-06-22 16:47   ` [tip:irq/core] PCI/vmd: " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 16/55] genirq/irqdomain: Add map counter Thomas Gleixner
2017-06-22 16:48   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 17/55] genirq/debugfs: Add proper debugfs interface Thomas Gleixner
2017-06-22 16:49   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 18/55] genirq: Add missing comment for IRQD_STARTED Thomas Gleixner
2017-06-22 16:49   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 19/55] genirq: Provide irq_fixup_move_pending() Thomas Gleixner
2017-06-20  4:21   ` Dou Liyang
2017-06-20  6:58     ` Thomas Gleixner
2017-06-22 16:50   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 20/55] x86/irq: Cleanup pending irq move in fixup_irqs() Thomas Gleixner
2017-06-22 16:50   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 21/55] genirq: Remove mask argument from setup_affinity() Thomas Gleixner
2017-06-22 16:51   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 22/55] genirq: Rename setup_affinity() to irq_setup_affinity() Thomas Gleixner
2017-06-22 16:52   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 23/55] genirq: Move initial affinity setup to irq_startup() Thomas Gleixner
2017-06-22 16:52   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 24/55] genirq: Move pending helpers to internal.h Thomas Gleixner
2017-06-22 16:53   ` [tip:irq/core] " tip-bot for Christoph Hellwig
2017-06-19 23:37 ` [patch 25/55] genirq/cpuhotplug: Remove irq disabling logic Thomas Gleixner
2017-06-22 16:53   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 26/55] genirq/cpuhotplug: Dont claim success on error Thomas Gleixner
2017-06-22 16:54   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 27/55] genirq/cpuhotplug: Reorder check logic Thomas Gleixner
2017-06-22 16:54   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 28/55] genirq/cpuhotplug: Do not migrated shutdown irqs Thomas Gleixner
2017-06-22 16:55   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 29/55] genirq/cpuhotplug: Add support for cleaning up move in progress Thomas Gleixner
2017-06-22 16:56   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 30/55] genirq/cpuhotplug: Add support for conditional masking Thomas Gleixner
2017-06-22 16:56   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 31/55] genirq/cpuhotplug: Set force affinity flag on hotplug migration Thomas Gleixner
2017-06-22 16:57   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 32/55] x86/irq: Restructure fixup_irqs() Thomas Gleixner
2017-06-20 21:34   ` Keith Busch
2017-06-20 21:28     ` Thomas Gleixner
2017-06-22 16:57   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 33/55] x86/irq: Use irq_migrate_all_off_this_cpu() Thomas Gleixner
2017-06-22 16:58   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 34/55] genirq: Move irq_fixup_move_pending() to core Thomas Gleixner
2017-06-22 16:58   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 35/55] genirq: Remove pointless arg from show_irq_affinity Thomas Gleixner
2017-06-22 16:59   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 36/55] genirq: Remove pointless gfp argument Thomas Gleixner
2017-06-22 17:00   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 37/55] genirq/proc: Replace ever repeating type cast Thomas Gleixner
2017-06-22 17:00   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 38/55] genirq: Introduce effective affinity mask Thomas Gleixner
2017-06-22 17:01   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 39/55] genirq/cpuhotplug: Use " Thomas Gleixner
2017-06-22 17:01   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 40/55] x86/apic: Move flat_cpu_mask_to_apicid_and() into C source Thomas Gleixner
2017-06-22 17:02   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 41/55] x86/uv: Use default_cpu_mask_to_apicid_and() Thomas Gleixner
2017-06-22 17:03   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 42/55] x86/apic: Move online masking to core code Thomas Gleixner
2017-06-22 17:03   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 43/55] x86/apic: Move cpumask and " Thomas Gleixner
2017-06-22 17:04   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 44/55] x86/apic: Add irq_data argument to apic->cpu_mask_to_apicid() Thomas Gleixner
2017-06-22 17:04   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 45/55] xen/events: Add support for effective affinity mask Thomas Gleixner
2017-06-22 17:05   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 46/55] x86/apic: Implement effective irq mask update Thomas Gleixner
2017-06-22 17:05   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 47/55] genirq: Introduce IRQD_MANAGED_SHUTDOWN Thomas Gleixner
2017-06-22 17:06   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 48/55] genirq: Split out irq_startup() code Thomas Gleixner
2017-06-22 17:06   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` Thomas Gleixner [this message]
2017-06-22 17:07   ` [tip:irq/core] genirq: Add force argument to irq_startup() tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 50/55] genirq: Handle managed irqs gracefully in irq_startup() Thomas Gleixner
2017-06-22 17:08   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 51/55] genirq/cpuhotplug: Handle managed IRQs on CPU hotplug Thomas Gleixner
2017-06-22 17:08   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 52/55] genirq: Introduce IRQD_SINGLE_TARGET flag Thomas Gleixner
2017-06-22 17:09   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 53/55] genirq/cpuhotplug: Avoid irq affinity setting for single targets Thomas Gleixner
2017-06-22 17:09   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 54/55] x86/apic: Mark single target interrupts Thomas Gleixner
2017-06-22 17:10   ` [tip:irq/core] " tip-bot for Thomas Gleixner
2017-06-19 23:37 ` [patch 55/55] genirq/affinity: Assign vectors to all present CPUs Thomas Gleixner
2017-06-20  9:23 ` [patch 00/55] genirq: Debuggability, consolidation and managed affinities Christoph Hellwig

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