[RFC PATCH v4 01/21] x86/msi: Add definition for NMI delivery mode

Ricardo Neri
2019-05-24T01:17:43Z

Until now, the delivery mode of MSI interrupts is set to the default
mode set in the APIC driver. However, there are no restrictions in hardware
to configure each interrupt with a different delivery mode. Specifying the
delivery mode per interrupt is useful when one is interested in changing
the delivery mode of a particular interrupt. For instance, this can be used
to deliver an interrupt as non-maskable.

Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ashok Raj <ashok.raj@intel.com>
Cc: Andi Kleen <andi.kleen@intel.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Juergen Gross <jgross@suse.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Wincy Van <fanwenyi0529@gmail.com>
Cc: Kate Stewart <kstewart@linuxfoundation.org>
Cc: Philippe Ombredanne <pombredanne@nexb.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
Cc: "Ravi V. Shankar" <ravi.v.shankar@intel.com>
Cc: x86@kernel.org
Signed-off-by: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
---
arch/x86/include/asm/msidef.h | 1 +
1 file changed, 1 insertion(+)

diff --git a/arch/x86/include/asm/msidef.h b/arch/x86/include/asm/msidef.h
index ee2f8ccc32d0..38ccfdc2d96e 100644
--- a/arch/x86/include/asm/msidef.h
+++ b/arch/x86/include/asm/msidef.h
@@ -18,6 +18,7 @@
#define MSI_DATA_DELIVERY_MODE_SHIFT 8
#define MSI_DATA_DELIVERY_FIXED (0 << MSI_DATA_DELIVERY_MODE_SHIFT)
#define MSI_DATA_DELIVERY_LOWPRI (1 << MSI_DATA_DELIVERY_MODE_SHIFT)
+#define MSI_DATA_DELIVERY_NMI (4 << MSI_DATA_DELIVERY_MODE_SHIFT)

#define MSI_DATA_LEVEL_SHIFT 14
#define MSI_DATA_LEVEL_DEASSERT (0 << MSI_DATA_LEVEL_SHIFT)
--
2.17.1