linux-kernel - [tip:x86/apic] PCI/MSI: Set MSI_FLAG_MUST

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Date:   Wed, 18 Oct 2017 06:43:22 -0700
From:   tip-bot for Thomas Gleixner <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     haiyangz@...rosoft.com, jopoulso@...rosoft.com,
        sixiao@...rosoft.com, sthemmin@...rosoft.com, marc.zyngier@....com,
        decui@...rosoft.com, kys@...rosoft.com,
        linux-kernel@...r.kernel.org, Jork.Loeser@...rosoft.com,
        tglx@...utronix.de, saeedm@...lanox.com, mingo@...nel.org,
        bhelgaas@...gle.com, hpa@...or.com, v-micos@...rosoft.com
Subject: [tip:x86/apic] PCI/MSI: Set MSI_FLAG_MUST_REACTIVATE in core code

Commit-ID:  25e960efc63852b84d1c3739aef586285b177395
Gitweb:     https://git.kernel.org/tip/25e960efc63852b84d1c3739aef586285b177395
Author:     Thomas Gleixner <tglx@...utronix.de>
AuthorDate: Tue, 17 Oct 2017 09:54:58 +0200
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Wed, 18 Oct 2017 15:38:31 +0200

PCI/MSI: Set MSI_FLAG_MUST_REACTIVATE in core code

If interrupt reservation mode is enabled then the PCI/MSI interrupts must
be reactivated after early activation.

Make sure that all callers of pci_msi_create_irq_domain() have the
MSI_FLAG_MUST_REACTIVATE set when reservation mode is enabled.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Josh Poulson <jopoulso@...rosoft.com>
Cc: Mihai Costache <v-micos@...rosoft.com>
Cc: Stephen Hemminger <sthemmin@...rosoft.com>
Cc: Marc Zyngier <marc.zyngier@....com>
Cc: linux-pci@...r.kernel.org
Cc: Haiyang Zhang <haiyangz@...rosoft.com>
Cc: Dexuan Cui <decui@...rosoft.com>
Cc: Simon Xiao <sixiao@...rosoft.com>
Cc: Saeed Mahameed <saeedm@...lanox.com>
Cc: Jork Loeser <Jork.Loeser@...rosoft.com>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: devel@...uxdriverproject.org
Cc: KY Srinivasan <kys@...rosoft.com>
Link: https://lkml.kernel.org/r/20171017075600.448649905@linutronix.de

---
 drivers/pci/msi.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 496ed91..e066071 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -1441,6 +1441,8 @@ struct irq_domain *pci_msi_create_irq_domain(struct fwnode_handle *fwnode,
 		pci_msi_domain_update_chip_ops(info);
 
 	info->flags |= MSI_FLAG_ACTIVATE_EARLY;
+	if (IS_ENABLED(CONFIG_GENERIC_IRQ_RESERVATION_MODE))
+		info->flags |= MSI_FLAG_MUST_REACTIVATE;
 
 	domain = msi_create_irq_domain(fwnode, info, parent);
 	if (!domain)