linux-kernel - [RFC PATCH 02/23] genirq: Introduce IRQD_DELIVER_AS

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Date:   Tue, 12 Jun 2018 17:57:22 -0700
From:   Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>
Cc:     Andi Kleen <andi.kleen@...el.com>, Ashok Raj <ashok.raj@...el.com>,
        Borislav Petkov <bp@...e.de>, Tony Luck <tony.luck@...el.com>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>, x86@...nel.org,
        sparclinux@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org,
        Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>,
        Jacob Pan <jacob.jun.pan@...el.com>,
        Marc Zyngier <marc.zyngier@....com>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Doug Berger <opendmb@...il.com>,
        Palmer Dabbelt <palmer@...ive.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        iommu@...ts.linux-foundation.org
Subject: [RFC PATCH 02/23] genirq: Introduce IRQD_DELIVER_AS_NMI

Certain interrupt controllers (e.g., APIC) are capable of delivering
interrupts to the CPU as non-maskable. Add the new IRQD_DELIVER_AS_NMI
interrupt state flag. The purpose of this flag is to communicate to the
underlying irqchip whether the interrupt must be delivered in this manner.

Cc: Ashok Raj <ashok.raj@...el.com>
Cc: Andi Kleen <andi.kleen@...el.com>
Cc: Tony Luck <tony.luck@...el.com>
Cc: Borislav Petkov <bp@...e.de>
Cc: Jacob Pan <jacob.jun.pan@...el.com>
Cc: Marc Zyngier <marc.zyngier@....com>
Cc: Bartosz Golaszewski <brgl@...ev.pl>
Cc: Doug Berger <opendmb@...il.com>
Cc: Palmer Dabbelt <palmer@...ive.com>
Cc: Randy Dunlap <rdunlap@...radead.org>
Cc: "Ravi V. Shankar" <ravi.v.shankar@...el.com>
Cc: x86@...nel.org
Cc: iommu@...ts.linux-foundation.org

Signed-off-by: Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
---
 include/linux/irq.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/include/linux/irq.h b/include/linux/irq.h
index 65916a3..7271a2c 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -208,6 +208,7 @@ struct irq_data {
  * IRQD_SINGLE_TARGET		- IRQ allows only a single affinity target
  * IRQD_DEFAULT_TRIGGER_SET	- Expected trigger already been set
  * IRQD_CAN_RESERVE		- Can use reservation mode
+ * IRQD_DELIVER_AS_NMI		- Deliver this interrupt as non-maskable
  */
 enum {
 	IRQD_TRIGGER_MASK		= 0xf,
@@ -230,6 +231,7 @@ enum {
 	IRQD_SINGLE_TARGET		= (1 << 24),
 	IRQD_DEFAULT_TRIGGER_SET	= (1 << 25),
 	IRQD_CAN_RESERVE		= (1 << 26),
+	IRQD_DELIVER_AS_NMI		= (1 << 27),
 };
 
 #define __irqd_to_state(d) ACCESS_PRIVATE((d)->common, state_use_accessors)
@@ -389,6 +391,16 @@ static inline bool irqd_can_reserve(struct irq_data *d)
 	return __irqd_to_state(d) & IRQD_CAN_RESERVE;
 }
 
+static inline void irqd_set_deliver_as_nmi(struct irq_data *d)
+{
+	__irqd_to_state(d) |= IRQD_DELIVER_AS_NMI;
+}
+
+static inline bool irqd_deliver_as_nmi(struct irq_data *d)
+{
+	return __irqd_to_state(d) & IRQD_DELIVER_AS_NMI;
+}
+
 #undef __irqd_to_state
 
 static inline irq_hw_number_t irqd_to_hwirq(struct irq_data *d)
-- 
2.7.4