Commit-ID: 22d0b12f3560d3b3264ee79faa1c05a5060fb916
Gitweb: http://git.kernel.org/tip/22d0b12f3560d3b3264ee79faa1c05a5060fb916
Author: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
AuthorDate: Wed, 13 Sep 2017 23:29:13 +0200
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Mon, 25 Sep 2017 20:38:25 +0200
genirq/irqdomain: Add force reactivation flag to irq domains
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@xxxxxxxxxxxxx>
Tested-by: Juergen Gross <jgross@xxxxxxxx>
Tested-by: Yu Chen <yu.c.chen@xxxxxxxxx>
Acked-by: Juergen Gross <jgross@xxxxxxxx>
Cc: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
Cc: Tony Luck <tony.luck@xxxxxxxxx>
Cc: Marc Zyngier <marc.zyngier@xxxxxxx>
Cc: Alok Kataria <akataria@xxxxxxxxxx>
Cc: Joerg Roedel <joro@xxxxxxxxxx>
Cc: "Rafael J. Wysocki" <rjw@xxxxxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Cc: Rui Zhang <rui.zhang@xxxxxxxxx>
Cc: "K. Y. Srinivasan" <kys@xxxxxxxxxxxxx>
Cc: Arjan van de Ven <arjan@xxxxxxxxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Len Brown <lenb@xxxxxxxxxx>
Link: https://lkml.kernel.org/r/20170913213153.106242536@xxxxxxxxxxxxx
---
include/linux/msi.h | 5 +++++
kernel/irq/msi.c | 2 ++
2 files changed, 7 insertions(+)
diff --git a/include/linux/msi.h b/include/linux/msi.h
index 80e3b56..eff16ef 100644
--- 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,
diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c
index d7553d0..edb987b 100644
--- a/kernel/irq/msi.c
+++ b/kernel/irq/msi.c
@@ -404,6 +404,8 @@ int msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev,
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;
--
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