linux-kernel - [PATCH v3 1/4] genirq: Introduce driver-readable IRQ status word

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <3575edb77b3e824f921b6fdbbe5a4fdb8a549e17.1292281184.git.jan.kiszka@web.de>
Date:	Mon, 13 Dec 2010 23:59:43 +0100
From:	Jan Kiszka <jan.kiszka@....de>
To:	Thomas Gleixner <tglx@...utronix.de>, Avi Kivity <avi@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>
Cc:	linux-kernel@...r.kernel.org, kvm <kvm@...r.kernel.org>,
	Tom Lyon <pugs@...co.com>,
	Alex Williamson <alex.williamson@...hat.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Jan Kiszka <jan.kiszka@...mens.com>
Subject: [PATCH v3 1/4] genirq: Introduce driver-readable IRQ status word

From: Jan Kiszka <jan.kiszka@...mens.com>

This associates a status word with every IRQ descriptor. Drivers can obtain
its content via get_irq_status(irq). First use case will be propagating the
interrupt sharing state.

Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>
---
 include/linux/interrupt.h |    2 ++
 include/linux/irq.h       |    2 ++
 kernel/irq/manage.c       |   15 +++++++++++++++
 3 files changed, 19 insertions(+), 0 deletions(-)

diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
index 79d0c4f..4c1aa72 100644
--- a/include/linux/interrupt.h
+++ b/include/linux/interrupt.h
@@ -126,6 +126,8 @@ struct irqaction {
 
 extern irqreturn_t no_action(int cpl, void *dev_id);
 
+extern unsigned long get_irq_status(unsigned int irq);
+
 #ifdef CONFIG_GENERIC_HARDIRQS
 extern int __must_check
 request_threaded_irq(unsigned int irq, irq_handler_t handler,
diff --git a/include/linux/irq.h b/include/linux/irq.h
index abde252..8bdb421 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -96,6 +96,7 @@ struct msi_desc;
  *			methods, to allow shared chip implementations
  * @msi_desc:		MSI descriptor
  * @affinity:		IRQ affinity on SMP
+ * @drv_status:		driver-readable status flags (IRQS_*)
  *
  * The fields here need to overlay the ones in irq_desc until we
  * cleaned up the direct references and switched everything over to
@@ -111,6 +112,7 @@ struct irq_data {
 #ifdef CONFIG_SMP
 	cpumask_var_t		affinity;
 #endif
+	unsigned long		drv_status;
 };
 
 /**
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 5f92acc..2ea0d30 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -1157,3 +1157,18 @@ int request_any_context_irq(unsigned int irq, irq_handler_t handler,
 	return !ret ? IRQC_IS_HARDIRQ : ret;
 }
 EXPORT_SYMBOL_GPL(request_any_context_irq);
+
+/**
+ *	get_irq_status - read interrupt line status word
+ *	@irq: Interrupt line of the status word
+ *
+ *	This returns the current content of the status word associated with
+ *	the given interrupt line. See IRQS_* flags for details.
+ */
+unsigned long get_irq_status(unsigned int irq)
+{
+	struct irq_desc *desc = irq_to_desc(irq);
+
+	return desc ? desc->irq_data.drv_status : 0;
+}
+EXPORT_SYMBOL_GPL(get_irq_status);
-- 
1.7.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/