[PATCH] msi: refactor and move the msi irq_chip into the arch code

It turns out msi_ops was simply not enough to abstract the architecture
specific details of msi.  So I have moved the resposibility of constructing
the struct irq_chip to the architectures, and have two architecture specific
functions arch_setup_msi_irq, and arch_teardown_msi_irq.

For simple architectures those functions can do all of the work.  For
architectures with platform dependencies they can call into the appropriate
platform code.

With this msi.c is finally free of assuming you have an apic, and this
actually takes less code.

The helpers for the architecture specific code are declared in the linux/msi.h
to keep them separate from the msi functions used by drivers in linux/pci.h

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Andi Kleen <ak@suse.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Greg KH <greg@kroah.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 15 insertions, 6 deletions

diff --git a/include/asm-ia64/machvec.h b/include/asm-ia64/machvec.h
index 15b545a897a4..90cba967df35 100644
--- a/include/asm-ia64/machvec.h
+++ b/include/asm-ia64/machvec.h
@@ -20,6 +20,7 @@ struct page;
 struct mm_struct;
 struct pci_bus;
 struct task_struct;
+struct pci_dev;
 
 typedef void ia64_mv_setup_t (char **);
 typedef void ia64_mv_cpu_init_t (void);
@@ -75,7 +76,9 @@ typedef unsigned char ia64_mv_readb_relaxed_t (const volatile void __iomem *);
 typedef unsigned short ia64_mv_readw_relaxed_t (const volatile void __iomem *);
 typedef unsigned int ia64_mv_readl_relaxed_t (const volatile void __iomem *);
 typedef unsigned long ia64_mv_readq_relaxed_t (const volatile void __iomem *);
-typedef int ia64_mv_msi_init_t (void);
+
+typedef int ia64_mv_setup_msi_irq_t (unsigned int irq, struct pci_dev *pdev);
+typedef void ia64_mv_teardown_msi_irq_t (unsigned int irq);
 
 static inline void
 machvec_noop (void)
@@ -154,7 +157,8 @@ extern void machvec_tlb_migrate_finish (struct mm_struct *);
 #  define platform_readl_relaxed        ia64_mv.readl_relaxed
 #  define platform_readq_relaxed        ia64_mv.readq_relaxed
 #  define platform_migrate              ia64_mv.migrate
-#  define platform_msi_init             ia64_mv.msi_init
+#  define platform_setup_msi_irq        ia64_mv.setup_msi_irq
+#  define platform_teardown_msi_irq     ia64_mv.teardown_msi_irq
 # endif
 
 /* __attribute__((__aligned__(16))) is required to make size of the
@@ -204,7 +208,8 @@ struct ia64_machine_vector {
         ia64_mv_readl_relaxed_t *readl_relaxed;
         ia64_mv_readq_relaxed_t *readq_relaxed;
         ia64_mv_migrate_t *migrate;
-        ia64_mv_msi_init_t *msi_init;
+        ia64_mv_setup_msi_irq_t *setup_msi_irq;
+        ia64_mv_teardown_msi_irq_t *teardown_msi_irq;
 } __attribute__((__aligned__(16))); /* align attrib? see above comment */
 
 #define MACHVEC_INIT(name)                      \
@@ -250,7 +255,8 @@ struct ia64_machine_vector {
         platform_readl_relaxed,                 \
         platform_readq_relaxed,                 \
         platform_migrate,                       \
-        platform_msi_init,                      \
+        platform_setup_msi_irq,                 \
+        platform_teardown_msi_irq,              \
 }
 
 extern struct ia64_machine_vector ia64_mv;
@@ -404,8 +410,11 @@ extern int ia64_pci_legacy_write(struct pci_bus *bus, u16 port, u32 val, u8 size
 #ifndef platform_migrate
 # define platform_migrate machvec_noop_task
 #endif
-#ifndef platform_msi_init
-# define platform_msi_init      ((ia64_mv_msi_init_t*)NULL)
+#ifndef platform_setup_msi_irq
+# define platform_setup_msi_irq         ((ia64_mv_setup_msi_irq_t*)NULL)
+#endif
+#ifndef platform_teardown_msi_irq
+# define platform_teardown_msi_irq      ((ia64_mv_teardown_msi_irq_t*)NULL)
 #endif
 
 #endif /* _ASM_IA64_MACHVEC_H */