x86: Embedd irq_2_iommu into irq_cfg

That interrupt remapping code is x86 specific and tied to the io_apic
code. No need for separate allocator functions in the interrupt
remapping code. This allows to simplify the code and irq_2_iommu is
small (13 bytes on 64bit) so it's not a real problem even if interrupt
remapping is runtime disabled. If it's compile time disabled the
impact is zero.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Ingo Molnar <mingo@elte.hu>
Acked-by: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>

3 files changed, 11 insertions, 7 deletions

diff --git a/arch/x86/include/asm/hw_irq.h b/arch/x86/include/asm/hw_irq.h
index 76848f27b1ac..e756c4bfed94 100644
--- a/arch/x86/include/asm/hw_irq.h
+++ b/arch/x86/include/asm/hw_irq.h
@@ -78,6 +78,13 @@ static inline void set_io_apic_irq_attr(struct io_apic_irq_attr *irq_attr,
         irq_attr->polarity      = polarity;
 }
 
+struct irq_2_iommu {
+        struct intel_iommu *iommu;
+        u16 irte_index;
+        u16 sub_handle;
+        u8  irte_mask;
+};
+
 /*
  * This is performance-critical, we want to do it O(1)
  *
@@ -89,6 +96,9 @@ struct irq_cfg {
         cpumask_var_t           old_domain;
         u8                      vector;
         u8                      move_in_progress : 1;
+#ifdef CONFIG_INTR_REMAP
+        struct irq_2_iommu      irq_2_iommu;
+#endif
 };
 
 extern struct irq_cfg *irq_cfg(unsigned int);
diff --git a/drivers/pci/intr_remapping.c b/drivers/pci/intr_remapping.c
index 343f7299c783..0f4691c5fab3 100644
--- a/drivers/pci/intr_remapping.c
+++ b/drivers/pci/intr_remapping.c
@@ -46,13 +46,6 @@ static __init int setup_intremap(char *str)
 }
 early_param("intremap", setup_intremap);
 
-struct irq_2_iommu {
-        struct intel_iommu *iommu;
-        u16 irte_index;
-        u16 sub_handle;
-        u8  irte_mask;
-};
-
 #ifdef CONFIG_GENERIC_HARDIRQS
 static struct irq_2_iommu *irq_2_iommu(unsigned int irq)
 {
diff --git a/include/linux/dmar.h b/include/linux/dmar.h
index 200439ec7c49..4475f8cf7a62 100644
--- a/include/linux/dmar.h
+++ b/include/linux/dmar.h
@@ -106,6 +106,7 @@ struct irte {
                 __u64 high;
         };
 };
+
 #ifdef CONFIG_INTR_REMAP
 extern int intr_remapping_enabled;
 extern int intr_remapping_supported(void);