linux-kernel - [tip: irq/msi] x86/apic/msi: Use DOMAIN_BUS_GENERIC

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Date: Sun, 25 Feb 2024 17:58:29 -0000
From: "tip-bot2 for Thomas Gleixner" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: "Borislav Petkov (AMD)" <bp@...en8.de>,
 Thomas Gleixner <tglx@...utronix.de>, Marc Zyngier <maz@...nel.org>,
 x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [tip: irq/msi] x86/apic/msi: Use DOMAIN_BUS_GENERIC_MSI for
 HPET/IO-APIC domain search

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

Commit-ID:     c147e1ef59d4751a60687074e4268ecc0ef31b5c
Gitweb:        https://git.kernel.org/tip/c147e1ef59d4751a60687074e4268ecc0ef31b5c
Author:        Thomas Gleixner <tglx@...utronix.de>
AuthorDate:    Sun, 25 Feb 2024 16:56:12 +01:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Sun, 25 Feb 2024 18:53:08 +01:00

x86/apic/msi: Use DOMAIN_BUS_GENERIC_MSI for HPET/IO-APIC domain search

The recent restriction to invoke irqdomain_ops::select() only when the
domain bus token is not DOMAIN_BUS_ANY breaks the search for the parent MSI
domain of HPET and IO-APIC. The latter causes a full boot fail.

The restriction itself makes sense to avoid adding DOMAIN_BUS_ANY matches
into the various ARM specific select() callbacks. Reverting this change
would obviously break ARM platforms again and require DOMAIN_BUS_ANY
matches added to various places.

A simpler solution is to use the DOMAIN_BUS_GENERIC_MSI token for the HPET
and IO-APIC parent domain search. This works out of the box because the
affected parent domains check only for the firmware specification content
and not for the bus token.

Fixes: 5aa3c0cf5bba ("genirq/irqdomain: Don't call ops->select for DOMAIN_BUS_ANY tokens")
Reported-by: Borislav Petkov (AMD) <bp@...en8.de>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Tested-by: Borislav Petkov (AMD) <bp@...en8.de>
Reviewed-by: Marc Zyngier <maz@...nel.org>
Link: https://lore.kernel.org/r/878r38cy8n.ffs@tglx
---
 arch/x86/kernel/apic/io_apic.c | 2 +-
 arch/x86/kernel/hpet.c         | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 40c7cf1..e66c775 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -2354,7 +2354,7 @@ static int mp_irqdomain_create(int ioapic)
 	fwspec.param_count = 1;
 	fwspec.param[0] = mpc_ioapic_id(ioapic);
 
-	parent = irq_find_matching_fwspec(&fwspec, DOMAIN_BUS_ANY);
+	parent = irq_find_matching_fwspec(&fwspec, DOMAIN_BUS_GENERIC_MSI);
 	if (!parent) {
 		if (!cfg->dev)
 			irq_domain_free_fwnode(fn);
diff --git a/arch/x86/kernel/hpet.c b/arch/x86/kernel/hpet.c
index a38d0c9..c96ae8f 100644
--- a/arch/x86/kernel/hpet.c
+++ b/arch/x86/kernel/hpet.c
@@ -568,7 +568,7 @@ static struct irq_domain *hpet_create_irq_domain(int hpet_id)
 	fwspec.param_count = 1;
 	fwspec.param[0] = hpet_id;
 
-	parent = irq_find_matching_fwspec(&fwspec, DOMAIN_BUS_ANY);
+	parent = irq_find_matching_fwspec(&fwspec, DOMAIN_BUS_GENERIC_MSI);
 	if (!parent) {
 		irq_domain_free_fwnode(fn);
 		kfree(domain_info);