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From: Jacob Pan <jacob.jun.pan@linux.intel.com>
To: LKML <linux-kernel@vger.kernel.org>,
	X86 Kernel <x86@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
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Cc: Paul Luse <paul.e.luse@intel.com>,
	Dan Williams <dan.j.williams@intel.com>,
	Jens Axboe <axboe@kernel.dk>,
	Raj Ashok <ashok.raj@intel.com>,
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	"Robin Murphy" <robin.murphy@arm.com>,
	Jacob Pan <jacob.jun.pan@linux.intel.com>
Subject: [PATCH 04/15] x86/irq: Add a Kconfig option for posted MSI
Date: Fri, 26 Jan 2024 15:42:26 -0800
Message-Id: <20240126234237.547278-5-jacob.jun.pan@linux.intel.com>
In-Reply-To: <20240126234237.547278-1-jacob.jun.pan@linux.intel.com>
References: <20240126234237.547278-1-jacob.jun.pan@linux.intel.com>
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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>
---
 arch/x86/Kconfig | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 5edec175b9bf..79f04ee2b91c 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -463,6 +463,17 @@ 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_X2APIC && 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
-- 
2.25.1