genirq: Introduce IRQD_CAN_RESERVE flag

KAGA-KOKO · KAGA-KOKO · commit 69790ba92b8d · 2017-12-29T21:13:04.000+01:00
Add a new flag to mark interrupts which can use reservation mode. This is
going to be used in subsequent patches to disable reservation mode for a
certain class of MSI devices.

Signed-off-by: Thomas Gleixner &lt;tglx@linutronix.de&gt;
Tested-by: Alexandru Chirvasitu &lt;achirvasub@gmail.com&gt;
Tested-by: Andy Shevchenko &lt;andriy.shevchenko@linux.intel.com&gt;
Cc: Dou Liyang &lt;douly.fnst@cn.fujitsu.com&gt;
Cc: Pavel Machek &lt;pavel@ucw.cz&gt;
Cc: Maciej W. Rozycki &lt;macro@linux-mips.org&gt;
Cc: Mikael Pettersson &lt;mikpelinux@gmail.com&gt;
Cc: Josh Poulson &lt;jopoulso@microsoft.com&gt;
Cc: Mihai Costache &lt;v-micos@microsoft.com&gt;
Cc: Stephen Hemminger &lt;sthemmin@microsoft.com&gt;
Cc: Marc Zyngier &lt;marc.zyngier@arm.com&gt;
Cc: linux-pci@vger.kernel.org
Cc: Haiyang Zhang &lt;haiyangz@microsoft.com&gt;
Cc: Dexuan Cui &lt;decui@microsoft.com&gt;
Cc: Simon Xiao &lt;sixiao@microsoft.com&gt;
Cc: Saeed Mahameed &lt;saeedm@mellanox.com&gt;
Cc: Jork Loeser &lt;Jork.Loeser@microsoft.com&gt;
Cc: Bjorn Helgaas &lt;bhelgaas@google.com&gt;
Cc: devel@linuxdriverproject.org
Cc: KY Srinivasan &lt;kys@microsoft.com&gt;
Cc: Alan Cox &lt;alan@linux.intel.com&gt;
Cc: Sakari Ailus &lt;sakari.ailus@intel.com&gt;,
Cc: linux-media@vger.kernel.org
diff --git a/include/linux/irq.h b/include/linux/irq.h
@@ -212,6 +212,7 @@ struct irq_data {
  *				  mask. Applies only to affinity managed irqs.
  * 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
  */
 enum {
 	IRQD_TRIGGER_MASK		= 0xf,
@@ -233,6 +234,7 @@ enum {
 	IRQD_MANAGED_SHUTDOWN		= (1 << 23),
 	IRQD_SINGLE_TARGET		= (1 << 24),
 	IRQD_DEFAULT_TRIGGER_SET	= (1 << 25),
+	IRQD_CAN_RESERVE		= (1 << 26),
 };
 
 #define __irqd_to_state(d) ACCESS_PRIVATE((d)->common, state_use_accessors)
@@ -377,6 +379,21 @@ static inline bool irqd_is_managed_and_shutdown(struct irq_data *d)
 	return __irqd_to_state(d) & IRQD_MANAGED_SHUTDOWN;
 }
 
+static inline void irqd_set_can_reserve(struct irq_data *d)
+{
+	__irqd_to_state(d) |= IRQD_CAN_RESERVE;
+}
+
+static inline void irqd_clr_can_reserve(struct irq_data *d)
+{
+	__irqd_to_state(d) &= ~IRQD_CAN_RESERVE;
+}
+
+static inline bool irqd_can_reserve(struct irq_data *d)
+{
+	return __irqd_to_state(d) & IRQD_CAN_RESERVE;
+}
+
 #undef __irqd_to_state
 
 static inline irq_hw_number_t irqd_to_hwirq(struct irq_data *d)
diff --git a/kernel/irq/debugfs.c b/kernel/irq/debugfs.c
@@ -113,6 +113,7 @@ static const struct irq_bit_descr irqdata_states[] = {
 	BIT_MASK_DESCR(IRQD_SETAFFINITY_PENDING),
 	BIT_MASK_DESCR(IRQD_AFFINITY_MANAGED),
 	BIT_MASK_DESCR(IRQD_MANAGED_SHUTDOWN),
+	BIT_MASK_DESCR(IRQD_CAN_RESERVE),
 
 	BIT_MASK_DESCR(IRQD_FORWARDED_TO_VCPU),
 
