x86/vector: Use IRQD_CAN_RESERVE flag

KAGA-KOKO · KAGA-KOKO · commit 945f50a59178 · 2017-12-29T21:13:04.000+01:00
Set the new CAN_RESERVE flag when the initial reservation for an interrupt
happens. The flag is used in a subsequent patch 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/arch/x86/kernel/apic/vector.c b/arch/x86/kernel/apic/vector.c
@@ -184,6 +184,7 @@ static void reserve_irq_vector_locked(struct irq_data *irqd)
 	irq_matrix_reserve(vector_matrix);
 	apicd->can_reserve = true;
 	apicd->has_reserved = true;
+	irqd_set_can_reserve(irqd);
 	trace_vector_reserve(irqd->irq, 0);
 	vector_assign_managed_shutdown(irqd);
 }
@@ -478,6 +479,7 @@ static bool vector_configure_legacy(unsigned int virq, struct irq_data *irqd,
 	} else {
 		/* Release the vector */
 		apicd->can_reserve = true;
+		irqd_set_can_reserve(irqd);
 		clear_irq_vector(irqd);
 		realloc = true;
 	}
