[patch RFC 08/38] x86/irq: Prepare consolidation of irq_alloc_info

[Thomas Gleixner <tglx@xxxxxxxxxxxxx>]

struct irq_alloc_info is a horrible zoo of unnamed structs in a union. Many
of the struct fields can be generic and don't have to be type specific like
hpet_id, ioapic_id...

Provide a generic set of members to prepare for the consolidation. The goal
is to make irq_alloc_info have the same basic member as the generic
msi_alloc_info so generic MSI domain ops can be reused and yet more mess
can be avoided when (non-PCI) device MSI support comes along.

Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
 arch/x86/include/asm/hw_irq.h |   22 ++++++++++++++++------
 1 file changed, 16 insertions(+), 6 deletions(-)

--- a/arch/x86/include/asm/hw_irq.h
+++ b/arch/x86/include/asm/hw_irq.h
@@ -44,10 +44,25 @@ enum irq_alloc_type {
        X86_IRQ_ALLOC_TYPE_HPET_GET_PARENT,
 };
 
+/**
+ * irq_alloc_info - X86 specific interrupt allocation info
+ * @type:      X86 specific allocation type
+ * @flags:     Flags for allocation tweaks
+ * @devid:     Device ID for allocations
+ * @hwirq:     Associated hw interrupt number in the domain
+ * @mask:      CPU mask for vector allocation
+ * @desc:      Pointer to msi descriptor
+ * @data:      Allocation specific data
+ */
 struct irq_alloc_info {
        enum irq_alloc_type     type;
        u32                     flags;
-       const struct cpumask    *mask;  /* CPU mask for vector allocation */
+       u32                     devid;
+       irq_hw_number_t         hwirq;
+       const struct cpumask    *mask;
+       struct msi_desc         *desc;
+       void                    *data;
+
        union {
                int             unused;
 #ifdef CONFIG_HPET_TIMER
@@ -88,11 +103,6 @@ struct irq_alloc_info {
                        char            *uv_name;
                };
 #endif
-#if IS_ENABLED(CONFIG_VMD)
-               struct {
-                       struct msi_desc *desc;
-               };
-#endif
        };
 };