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[v3,04/12] x86/irq: Add a Kconfig option for posted MSI

Message ID 20240423174114.526704-5-jacob.jun.pan@linux.intel.com (mailing list archive)
State New, archived
Headers show
Series Coalesced Interrupt Delivery with posted MSI | expand

Commit Message

Jacob Pan April 23, 2024, 5:41 p.m. UTC 
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>

---
v2: Remove x2apic dependency
---
 arch/x86/Kconfig | 11 +++++++++++
 1 file changed, 11 insertions(+)
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Patch

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 4474bf32d0a4..fed22fc66217 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