linux-kernel - [PATCH v7 02/24] x86/apic/msi: Use the delivery mode from irq

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Date:   Wed,  1 Mar 2023 15:47:31 -0800
From:   Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
To:     Tony Luck <tony.luck@...el.com>,
        Dave Hansen <dave.hansen@...el.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Reinette Chatre <reinette.chatre@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Len Brown <len.brown@...el.com>
Cc:     Andi Kleen <ak@...ux.intel.com>,
        Stephane Eranian <eranian@...gle.com>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>,
        Ricardo Neri <ricardo.neri@...el.com>,
        linuxppc-dev@...ts.ozlabs.org, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org,
        Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
Subject: [PATCH v7 02/24] x86/apic/msi: Use the delivery mode from irq_cfg for message composition

irq_cfg provides a delivery mode for each interrupt. Use it instead
of the hardcoded APIC_DELIVERY_MODE_FIXED. This allows to compose
messages for NMI delivery mode which is required to implement a HPET-
based NMI watchdog.

No functional change as the default delivery mode is set to
APIC_DELIVERY_MODE_FIXED.

Cc: Andi Kleen <ak@...ux.intel.com>
Cc: "Ravi V. Shankar" <ravi.v.shankar@...el.com>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: iommu@...ts.linux-foundation.org
Cc: linuxppc-dev@...ts.ozlabs.org
Reviewed-by: Tony Luck <tony.luck@...el.com>
Signed-off-by: Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
---
Changes since v6:
 * Reworded changelog as per suggestion from Thomas.

Changes since v5:
 * Introduced this patch

Changes since v4:
 * N/A

Changes since v3:
 * N/A

Changes since v2:
 * N/A

Changes since v1:
 * N/A
---
 arch/x86/kernel/apic/apic.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 20d9a604da7c..352738238e52 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -2562,7 +2562,7 @@ void __irq_msi_compose_msg(struct irq_cfg *cfg, struct msi_msg *msg,
 	msg->arch_addr_lo.dest_mode_logical = apic->dest_mode_logical;
 	msg->arch_addr_lo.destid_0_7 = cfg->dest_apicid & 0xFF;
 
-	msg->arch_data.delivery_mode = APIC_DELIVERY_MODE_FIXED;
+	msg->arch_data.delivery_mode = cfg->delivery_mode;
 	msg->arch_data.vector = cfg->vector;
 
 	msg->address_hi = X86_MSI_BASE_ADDRESS_HIGH;
-- 
2.25.1