iommu/vt-d: Make intr-remapping initialization generic

This patch introduces irq_remap_ops to hold implementation
specific function pointer to handle interrupt remapping. As
the first part the initialization functions for VT-d are
converted to these ops.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Acked-by: Yinghai Lu <yinghai@kernel.org>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

1 files changed, 45 insertions, 0 deletions

diff --git a/arch/x86/include/asm/intr_remapping.h b/arch/x86/include/asm/intr_remapping.h
new file mode 100644
index 000000000000..207c605dbdf5
--- /dev/null
+++ b/arch/x86/include/asm/intr_remapping.h
@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2012 Advanced Micro Devices, Inc.
+ * Author: Joerg Roedel <joerg.roedel@amd.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ *
+ * This header file contains the interface of the interrupt remapping code to
+ * the x86 interrupt management code.
+ */
+
+#ifndef __X86_INTR_REMAPPING_H
+#define __X86_INTR_REMAPPING_H
+
+#ifdef CONFIG_IRQ_REMAP
+
+extern int intr_remapping_enabled;
+
+extern void setup_intr_remapping(void);
+extern int intr_remapping_supported(void);
+extern int intr_hardware_init(void);
+extern int intr_hardware_enable(void);
+
+#else  /* CONFIG_IRQ_REMAP */
+
+#define intr_remapping_enabled	0
+
+static inline void setup_intr_remapping(void) { }
+static inline int intr_remapping_supported(void) { return 0; }
+static inline int intr_hardware_init(void) { return -ENODEV; }
+static inline int intr_hardware_enable(void) { return -ENODEV; }
+
+#endif /* CONFIG_IRQ_REMAP */
+
+#endif /* __X86_INTR_REMAPPING_H */