[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>

7 files changed, 70 insertions, 146 deletions

diff --git a/include/asm-i386/msi.h b/include/asm-i386/msi.h
deleted file mode 100644
index 7368a89a0f42..000000000000
--- a/include/asm-i386/msi.h
+++ /dev/null
@@ -1,20 +0,0 @@
-/*
- * Copyright (C) 2003-2004 Intel
- * Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com)
- */
-
-#ifndef ASM_MSI_H
-#define ASM_MSI_H
-
-#include <asm/desc.h>
-#include <mach_apic.h>
-
-extern struct msi_ops arch_msi_ops;
-
-static inline int msi_arch_init(void)
-{
-        msi_register(&arch_msi_ops);
-        return 0;
-}
-
-#endif /* ASM_MSI_H */
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 */
diff --git a/include/asm-ia64/machvec_sn2.h b/include/asm-ia64/machvec_sn2.h
index cf724dc79d8c..c54b165b1c17 100644
--- a/include/asm-ia64/machvec_sn2.h
+++ b/include/asm-ia64/machvec_sn2.h
@@ -67,7 +67,8 @@ extern ia64_mv_dma_sync_sg_for_device	sn_dma_sync_sg_for_device;
 extern ia64_mv_dma_mapping_error        sn_dma_mapping_error;
 extern ia64_mv_dma_supported            sn_dma_supported;
 extern ia64_mv_migrate_t                sn_migrate;
-extern ia64_mv_msi_init_t               sn_msi_init;
+extern ia64_mv_setup_msi_irq_t          sn_setup_msi_irq;
+extern ia64_mv_teardown_msi_irq_t       sn_teardown_msi_irq;
 
 
 /*
@@ -120,9 +121,11 @@ extern ia64_mv_msi_init_t		sn_msi_init;
 #define platform_dma_supported          sn_dma_supported
 #define platform_migrate                sn_migrate
 #ifdef CONFIG_PCI_MSI
-#define platform_msi_init               sn_msi_init
+#define platform_setup_msi_irq          sn_setup_msi_irq
+#define platform_teardown_msi_irq       sn_teardown_msi_irq
 #else
-#define platform_msi_init               ((ia64_mv_msi_init_t*)NULL)
+#define platform_setup_msi_irq          ((ia64_mv_setup_msi_irq_t*)NULL)
+#define platform_teardown_msi_irq       ((ia64_mv_teardown_msi_irq_t*)NULL)
 #endif
 
 #include <asm/sn/io.h>
diff --git a/include/asm-ia64/msi.h b/include/asm-ia64/msi.h
deleted file mode 100644
index bb92b0dbde2f..000000000000
--- a/include/asm-ia64/msi.h
+++ /dev/null
@@ -1,29 +0,0 @@
-/*
- * Copyright (C) 2003-2004 Intel
- * Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com)
- */
-
-#ifndef ASM_MSI_H
-#define ASM_MSI_H
-
-#define NR_VECTORS              NR_IRQS
-#define FIRST_DEVICE_VECTOR     IA64_FIRST_DEVICE_VECTOR
-#define LAST_DEVICE_VECTOR      IA64_LAST_DEVICE_VECTOR
-static inline void set_intr_gate (int nr, void *func) {}
-#define IO_APIC_VECTOR(irq)     (irq)
-#define ack_APIC_irq            ia64_eoi
-#define MSI_TARGET_CPU_SHIFT    4
-
-extern struct msi_ops msi_apic_ops;
-
-static inline int msi_arch_init(void)
-{
-        if (platform_msi_init)
-                return platform_msi_init();
-
-        /* default ops for most ia64 platforms */
-        msi_register(&msi_apic_ops);
-        return 0;
-}
-
-#endif /* ASM_MSI_H */
diff --git a/include/asm-x86_64/msi.h b/include/asm-x86_64/msi.h
deleted file mode 100644
index 1876fda52ae3..000000000000
--- a/include/asm-x86_64/msi.h
+++ /dev/null
@@ -1,21 +0,0 @@
-/*
- * Copyright (C) 2003-2004 Intel
- * Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com)
- */
-
-#ifndef ASM_MSI_H
-#define ASM_MSI_H
-
-#include <asm/desc.h>
-#include <asm/mach_apic.h>
-#include <asm/smp.h>
-
-extern struct msi_ops arch_msi_ops;
-
-static inline int msi_arch_init(void)
-{
-        msi_register(&arch_msi_ops);
-        return 0;
-}
-
-#endif /* ASM_MSI_H */
diff --git a/include/linux/msi.h b/include/linux/msi.h
new file mode 100644
index 000000000000..c7ef94343673
--- /dev/null
+++ b/include/linux/msi.h
@@ -0,0 +1,49 @@
+#ifndef LINUX_MSI_H
+#define LINUX_MSI_H
+
+struct msi_msg {
+        u32     address_lo;     /* low 32 bits of msi message address */
+        u32     address_hi;     /* high 32 bits of msi message address */
+        u32     data;           /* 16 bits of msi message data */
+};
+
+/* Heper functions */
+extern void mask_msi_irq(unsigned int irq);
+extern void unmask_msi_irq(unsigned int irq);
+extern void read_msi_msg(unsigned int irq, struct msi_msg *msg);
+
+extern void write_msi_msg(unsigned int irq, struct msi_msg *msg);
+
+struct msi_desc {
+        struct {
+                __u8    type    : 5;    /* {0: unused, 5h:MSI, 11h:MSI-X} */
+                __u8    maskbit : 1;    /* mask-pending bit supported ?   */
+                __u8    unused  : 1;
+                __u8    is_64   : 1;    /* Address size: 0=32bit 1=64bit  */
+                __u8    pos;            /* Location of the msi capability */
+                __u16   entry_nr;       /* specific enabled entry         */
+                unsigned default_irq;   /* default pre-assigned irq       */
+        }msi_attrib;
+
+        struct {
+                __u16   head;
+                __u16   tail;
+        }link;
+
+        void __iomem *mask_base;
+        struct pci_dev *dev;
+
+#ifdef CONFIG_PM
+        /* PM save area for MSIX address/data */
+        struct msi_msg msg_save;
+#endif
+};
+
+/*
+ * The arch hook for setup up msi irqs
+ */
+int arch_setup_msi_irq(unsigned int irq, struct pci_dev *dev);
+void arch_teardown_msi_irq(unsigned int irq);
+
+
+#endif /* LINUX_MSI_H */
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 9b34bc8f34e4..0da5a4a8940f 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -595,11 +595,6 @@ struct msix_entry {
         u16     entry;  /* driver uses to specify entry, OS writes */
 };
 
-struct msi_msg {
-        u32     address_lo;     /* low 32 bits of msi message address */
-        u32     address_hi;     /* high 32 bits of msi message address */
-        u32     data;           /* 16 bits of msi message data */
-};
 
 #ifndef CONFIG_PCI_MSI
 static inline void pci_scan_msi_device(struct pci_dev *dev) {}
@@ -617,68 +612,6 @@ extern int pci_enable_msix(struct pci_dev* dev,
         struct msix_entry *entries, int nvec);
 extern void pci_disable_msix(struct pci_dev *dev);
 extern void msi_remove_pci_irq_vectors(struct pci_dev *dev);
-
-/*
- * MSI operation vector.  Used by the msi core code (drivers/pci/msi.c)
- * to abstract platform-specific tasks relating to MSI address generation
- * and resource management.
- */
-struct msi_ops {
-        int needs_64bit_address;
-        /**
-         * setup - generate an MSI bus address and data for a given vector
-         * @pdev: PCI device context (in)
-         * @irq: irq allocated by the msi core (in)
-         * @msg: PCI bus address and data for msi message (out)
-         *
-         * Description: The setup op is used to generate a PCI bus addres and
-         * data which the msi core will program into the card MSI capability
-         * registers.  The setup routine is responsible for picking an initial
-         * cpu to target the MSI at.  The setup routine is responsible for
-         * examining pdev to determine the MSI capabilities of the card and
-         * generating a suitable address/data.  The setup routine is
-         * responsible for allocating and tracking any system resources it
-         * needs to route the MSI to the cpu it picks, and for associating
-         * those resources with the passed in vector.
-         *
-         * Returns 0 if the MSI address/data was successfully setup.
-         **/
-
-        int     (*setup)    (struct pci_dev *pdev, unsigned int irq,
-                             struct msi_msg *msg);
-
-        /**
-         * teardown - release resources allocated by setup
-         * @vector: vector context for resources (in)
-         *
-         * Description:  The teardown op is used to release any resources
-         * that were allocated in the setup routine associated with the passed
-         * in vector.
-         **/
-
-        void    (*teardown) (unsigned int irq);
-
-        /**
-         * target - retarget an MSI at a different cpu
-         * @vector: vector context for resources (in)
-         * @cpu:  new cpu to direct vector at (in)
-         * @addr_hi: new value of PCI bus upper 32 bits (in/out)
-         * @addr_lo: new value of PCI bus lower 32 bits (in/out)
-         *
-         * Description:  The target op is used to redirect an MSI vector
-         * at a different cpu.  addr_hi/addr_lo coming in are the existing
-         * values that the MSI core has programmed into the card.  The
-         * target code is responsible for freeing any resources (if any)
-         * associated with the old address, and generating a new PCI bus
-         * addr_hi/addr_lo that will redirect the vector at the indicated cpu.
-         **/
-
-        void    (*target)   (unsigned int irq, cpumask_t cpumask,
-                             struct msi_msg *msg);
-};
-
-extern int msi_register(struct msi_ops *ops);
-
 #endif
 
 #ifdef CONFIG_HT_IRQ