[xen staging] xen/arm: ffa: fix bind/unbind notification

[patchbot@xxxxxxx]

commit 39c45caef271bc2b2e299217450cfda24c0c772a
Author:     Jens Wiklander <jens.wiklander@xxxxxxxxxx>
AuthorDate: Mon Feb 3 11:21:12 2025 +0100
Commit:     Stefano Stabellini <stefano.stabellini@xxxxxxx>
CommitDate: Mon Feb 3 14:48:20 2025 -0800

    xen/arm: ffa: fix bind/unbind notification
    
    The notification bitmask is in passed in the FF-A ABI in two 32-bit
    registers w3 and w4. The lower 32-bits should go in w3 and the higher in
    w4. These two registers has unfortunately been swapped for
    FFA_NOTIFICATION_BIND and FFA_NOTIFICATION_UNBIND in the FF-A mediator.
    So fix that by using the correct registers.
    
    Fixes: b490f470f58d ("xen/arm: ffa: support notification")
    Signed-off-by: Jens Wiklander <jens.wiklander@xxxxxxxxxx>
    Reviewed-by: Bertrand Marquis <bertrand.marquis@xxxxxxx>
    Relese-Acked-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
---
 xen/arch/arm/tee/ffa_notif.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/xen/arch/arm/tee/ffa_notif.c b/xen/arch/arm/tee/ffa_notif.c
index 21b9e78f63..00efaf8f73 100644
--- a/xen/arch/arm/tee/ffa_notif.c
+++ b/xen/arch/arm/tee/ffa_notif.c
@@ -40,8 +40,8 @@ int ffa_handle_notification_bind(struct cpu_user_regs *regs)
      * We only support notifications from SP so no need to check the sender
      * endpoint ID, the SPMC will take care of that for us.
      */
-    return ffa_simple_call(FFA_NOTIFICATION_BIND, src_dst, flags, bitmap_hi,
-                           bitmap_lo);
+    return ffa_simple_call(FFA_NOTIFICATION_BIND, src_dst, flags, bitmap_lo,
+                           bitmap_hi);
 }
 
 int ffa_handle_notification_unbind(struct cpu_user_regs *regs)
@@ -61,8 +61,8 @@ int ffa_handle_notification_unbind(struct cpu_user_regs *regs)
      * We only support notifications from SP so no need to check the
      * destination endpoint ID, the SPMC will take care of that for us.
      */
-    return  ffa_simple_call(FFA_NOTIFICATION_UNBIND, src_dst, 0, bitmap_hi,
-                            bitmap_lo);
+    return  ffa_simple_call(FFA_NOTIFICATION_UNBIND, src_dst, 0, bitmap_lo,
+                            bitmap_hi);
 }
 
 void ffa_handle_notification_info_get(struct cpu_user_regs *regs)
--
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