[Xen-changelog] [xen master] xen/device-tree: Do not remap IRQs for secondary IRQ controllers

[patchbot@xxxxxxx]

commit c32381352cce9744e640bf239d2704dae4af4fc7
Author:     Edgar E. Iglesias <edgar.iglesias@xxxxxxxxxx>
AuthorDate: Tue May 17 14:15:50 2016 +0200
Commit:     Stefano Stabellini <sstabellini@xxxxxxxxxx>
CommitDate: Tue May 17 18:27:04 2016 +0100

    xen/device-tree: Do not remap IRQs for secondary IRQ controllers
    
    Do not remap IRQs connected to secondary interrupt controllers.
    These IRQs have no meaning to us until they connect to the
    primary controller.
    
    Secondary IRQ controllers will at some point connect to the
    primary controller (possibly via other IRQ controllers). We
    map the IRQs at that last connection point.
    
    Reviewed-by: Julien Grall <julien.grall@xxxxxxxxxx>
    Signed-off-by: Edgar E. Iglesias <edgar.iglesias@xxxxxxxxxx>
---
 xen/common/device_tree.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/xen/common/device_tree.c b/xen/common/device_tree.c
index 0ed86a7..06a2837 100644
--- a/xen/common/device_tree.c
+++ b/xen/common/device_tree.c
@@ -1176,6 +1176,23 @@ int dt_for_each_irq_map(const struct dt_device_node *dev,
         for ( i = 0; i < pintsize; i++ )
             dt_raw_irq.specifier[i] = dt_read_number(imap + i, 1);
 
+        if ( dt_raw_irq.controller != dt_interrupt_controller )
+        {
+            /*
+             * We don't map IRQs connected to secondary IRQ controllers as
+             * these IRQs have no meaning to us until they connect to the
+             * primary controller.
+             *
+             * Secondary IRQ controllers will at some point connect to
+             * the primary controller (possibly via other IRQ controllers).
+             * We map the IRQs at that last connection point.
+             */
+            imap += pintsize;
+            imaplen -= pintsize;
+            dt_dprintk(" -> Skipped IRQ for secondary IRQ controller\n");
+            continue;
+        }
+
         ret = dt_irq_translate(&dt_raw_irq, &dt_irq);
         if ( ret )
         {
--
generated by git-patchbot for /home/xen/git/xen.git#master

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