[tip: x86/irq] x86/irq: Add a Kconfig option for posted MSI

["tip-bot2 for Jacob Pan" <tip-bot2@linutronix.de>]

The following commit has been merged into the x86/irq branch of tip:

Commit-ID:     7fec07fd217800c5174f51d8869518807e9aa144
Gitweb:        https://git.kernel.org/tip/7fec07fd217800c5174f51d8869518807e9aa144
Author:        Jacob Pan <jacob.jun.pan@linux.intel.com>
AuthorDate:    Tue, 23 Apr 2024 10:41:06 -07:00
Committer:     Thomas Gleixner <tglx@linutronix.de>
CommitterDate: Tue, 30 Apr 2024 00:54:42 +02:00

x86/irq: Add a Kconfig option for posted MSI

This option will be used to support delivering MSIs as posted
interrupts. Interrupt remapping is required.

Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20240423174114.526704-5-jacob.jun.pan@linux.intel.com


---
 arch/x86/Kconfig | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 4474bf3..fed22fc 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -464,6 +464,17 @@ config X86_X2APIC
 
 	  If you don't know what to do here, say N.
 
+config X86_POSTED_MSI
+	bool "Enable MSI and MSI-x delivery by posted interrupts"
+	depends on X86_64 && IRQ_REMAP
+	help
+	  This enables MSIs that are under interrupt remapping to be delivered as
+	  posted interrupts to the host kernel. Interrupt throughput can
+	  potentially be improved by coalescing CPU notifications during high
+	  frequency bursts.
+
+	  If you don't know what to do here, say N.
+
 config X86_MPPARSE
 	bool "Enable MPS table" if ACPI
 	default y