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Message-Id: <20170913213153.106242536@linutronix.de>
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Date: Wed, 13 Sep 2017 23:29:13 +0200
From: Thomas Gleixner <tglx@linutronix.de>
To: LKML <linux-kernel@vger.kernel.org>
Cc: Ingo Molnar <mingo@kernel.org>, Peter Anvin <hpa@zytor.com>,
        Marc Zyngier <marc.zyngier@arm.com>,
        Peter Zijlstra <peterz@infradead.org>, Borislav Petkov <bp@alien8.de>,
        Chen Yu <yu.c.chen@intel.com>, Rui Zhang <rui.zhang@intel.com>,
        "Rafael J. Wysocki" <rjw@rjwysocki.net>, Len Brown <lenb@kernel.org>,
        Dan Williams <dan.j.williams@intel.com>,
        Christoph Hellwig <hch@lst.de>, Paolo Bonzini <pbonzini@redhat.com>,
        Joerg Roedel <joro@8bytes.org>,
        Boris Ostrovsky <boris.ostrovsky@oracle.com>,
        Juergen Gross <jgross@suse.com>, Tony Luck <tony.luck@intel.com>,
        "K. Y. Srinivasan" <kys@microsoft.com>,
        Alok Kataria <akataria@vmware.com>,
        Steven Rostedt <rostedt@goodmis.org>,
        Arjan van de Ven <arjan@linux.intel.com>
Subject: [patch 11/52] genirq/irqdomain: Add force reactivation flag to irq
 domains
References: <20170913212902.530704676@linutronix.de>
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 filename=genirq-irqdomain--Add-force-reactivation-flag-to-irq-domains.patch
Sender: linux-kernel-owner@vger.kernel.org
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Allow irqdomains to tell the core code, that after early activation the
interrupt needs to be reactivated at request_irq() time.

This allows reservation of vectors at early activation time and actual
vector assignment at request_irq() time.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 include/linux/msi.h |    5 +++++
 kernel/irq/msi.c    |    2 ++
 2 files changed, 7 insertions(+)

Index: b/include/linux/msi.h
===================================================================
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -283,6 +283,11 @@ enum {
 	MSI_FLAG_PCI_MSIX		= (1 << 3),
 	/* Needs early activate, required for PCI */
 	MSI_FLAG_ACTIVATE_EARLY		= (1 << 4),
+	/*
+	 * Must reactivate when irq is started even when
+	 * MSI_FLAG_ACTIVATE_EARLY has been set.
+	 */
+	MSI_FLAG_MUST_REACTIVATE	= (1 << 5),
 };
 
 int msi_domain_set_affinity(struct irq_data *data, const struct cpumask *mask,
Index: b/kernel/irq/msi.c
===================================================================
--- a/kernel/irq/msi.c
+++ b/kernel/irq/msi.c
@@ -403,6 +403,8 @@ int msi_domain_alloc_irqs(struct irq_dom
 			ret = irq_domain_activate_irq(irq_data, true);
 			if (ret)
 				goto cleanup;
+			if (info->flags & MSI_FLAG_MUST_REACTIVATE)
+				irqd_clr_activated(irq_data);
 		}
 	}
 	return 0;