[IA64] pvops: add hooks, pv_iosapic_ops, to paravirtualize iosapic.

add hooks to paravirtualize iosapic which is a real hardware resource.
On virtualized environment it may be replaced something virtualized
friendly.
Define pv_iosapic_ops and add the hooks.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: Tony Luck <tony.luck@intel.com>

diff --git a/arch/ia64/kernel/iosapic.c b/arch/ia64/kernel/iosapic.c
index 082c31d..587196d 100644 (file)
--- a/arch/ia64/kernel/iosapic.c
+++ b/arch/ia64/kernel/iosapic.c
@@ -587,6 +587,15 @@ static inline int irq_is_shared (int irq)
        return (iosapic_intr_info[irq].count > 1);
 }
 
+struct irq_chip*
+ia64_native_iosapic_get_irq_chip(unsigned long trigger)
+{
+       if (trigger == IOSAPIC_EDGE)
+               return &irq_type_iosapic_edge;
+       else
+               return &irq_type_iosapic_level;
+}
+
 static int
 register_intr (unsigned int gsi, int irq, unsigned char delivery,
               unsigned long polarity, unsigned long trigger)
@@ -637,13 +646,10 @@ register_intr (unsigned int gsi, int irq, unsigned char delivery,
        iosapic_intr_info[irq].dmode    = delivery;
        iosapic_intr_info[irq].trigger  = trigger;
 
-       if (trigger == IOSAPIC_EDGE)
-               irq_type = &irq_type_iosapic_edge;
-       else
-               irq_type = &irq_type_iosapic_level;
+       irq_type = iosapic_get_irq_chip(trigger);
 
        idesc = irq_desc + irq;
-       if (idesc->chip != irq_type) {
+       if (irq_type != NULL && idesc->chip != irq_type) {
                if (idesc->chip != &no_irq_type)
                        printk(KERN_WARNING
                               "%s: changing vector %d from %s to %s\n",
@@ -976,6 +982,22 @@ iosapic_override_isa_irq (unsigned int isa_irq, unsigned int gsi,
 }
 
 void __init
+ia64_native_iosapic_pcat_compat_init(void)
+{
+       if (pcat_compat) {
+               /*
+                * Disable the compatibility mode interrupts (8259 style),
+                * needs IN/OUT support enabled.
+                */
+               printk(KERN_INFO
+                      "%s: Disabling PC-AT compatible 8259 interrupts\n",
+                      __func__);
+               outb(0xff, 0xA1);
+               outb(0xff, 0x21);
+       }
+}
+
+void __init
 iosapic_system_init (int system_pcat_compat)
 {
        int irq;
@@ -989,17 +1011,8 @@ iosapic_system_init (int system_pcat_compat)
        }
 
        pcat_compat = system_pcat_compat;
-       if (pcat_compat) {
-               /*
-                * Disable the compatibility mode interrupts (8259 style),
-                * needs IN/OUT support enabled.
-                */
-               printk(KERN_INFO
-                      "%s: Disabling PC-AT compatible 8259 interrupts\n",
-                      __func__);
-               outb(0xff, 0xA1);
-               outb(0xff, 0x21);
-       }
+       if (pcat_compat)
+               iosapic_pcat_compat_init();
 }
 
 static inline int

diff --git a/arch/ia64/kernel/paravirt.c b/arch/ia64/kernel/paravirt.c
index 5daf659..65c211b 100644 (file)
--- a/arch/ia64/kernel/paravirt.c
+++ b/arch/ia64/kernel/paravirt.c
@@ -312,3 +312,28 @@ paravirt_cpu_asm_init(const struct pv_cpu_asm_switch *cpu_asm_switch)
                cpu_asm_switch->work_processed_syscall;
        paravirt_leave_kernel_targ = cpu_asm_switch->leave_kernel;
 }
+
+/***************************************************************************
+ * pv_iosapic_ops
+ * iosapic read/write hooks.
+ */
+
+static unsigned int
+ia64_native_iosapic_read(char __iomem *iosapic, unsigned int reg)
+{
+       return __ia64_native_iosapic_read(iosapic, reg);
+}
+
+static void
+ia64_native_iosapic_write(char __iomem *iosapic, unsigned int reg, u32 val)
+{
+       __ia64_native_iosapic_write(iosapic, reg, val);
+}
+
+struct pv_iosapic_ops pv_iosapic_ops = {
+       .pcat_compat_init = ia64_native_iosapic_pcat_compat_init,
+       .get_irq_chip = ia64_native_iosapic_get_irq_chip,
+
+       .__read = ia64_native_iosapic_read,
+       .__write = ia64_native_iosapic_write,
+};

diff --git a/include/asm-ia64/iosapic.h b/include/asm-ia64/iosapic.h
index a3a4288..b9c102e 100644 (file)
--- a/include/asm-ia64/iosapic.h
+++ b/include/asm-ia64/iosapic.h
@@ -55,13 +55,27 @@
 
 #define NR_IOSAPICS                    256
 
-static inline unsigned int __iosapic_read(char __iomem *iosapic, unsigned int reg)
+#ifdef CONFIG_PARAVIRT_GUEST
+#include <asm/paravirt.h>
+#else
+#define iosapic_pcat_compat_init       ia64_native_iosapic_pcat_compat_init
+#define __iosapic_read                 __ia64_native_iosapic_read
+#define __iosapic_write                        __ia64_native_iosapic_write
+#define iosapic_get_irq_chip           ia64_native_iosapic_get_irq_chip
+#endif
+
+extern void __init ia64_native_iosapic_pcat_compat_init(void);
+extern struct irq_chip *ia64_native_iosapic_get_irq_chip(unsigned long trigger);
+
+static inline unsigned int
+__ia64_native_iosapic_read(char __iomem *iosapic, unsigned int reg)
 {
        writel(reg, iosapic + IOSAPIC_REG_SELECT);
        return readl(iosapic + IOSAPIC_WINDOW);
 }
 
-static inline void __iosapic_write(char __iomem *iosapic, unsigned int reg, u32 val)
+static inline void
+__ia64_native_iosapic_write(char __iomem *iosapic, unsigned int reg, u32 val)
 {
        writel(reg, iosapic + IOSAPIC_REG_SELECT);
        writel(val, iosapic + IOSAPIC_WINDOW);

diff --git a/include/asm-ia64/paravirt.h b/include/asm-ia64/paravirt.h
index 84d74c3..3a40f62 100644 (file)
--- a/include/asm-ia64/paravirt.h
+++ b/include/asm-ia64/paravirt.h
@@ -112,6 +112,46 @@ static inline void paravirt_post_smp_prepare_boot_cpu(void)
                pv_init_ops.post_smp_prepare_boot_cpu();
 }
 
+/******************************************************************************
+ * replacement of iosapic operations.
+ */
+
+struct pv_iosapic_ops {
+       void (*pcat_compat_init)(void);
+
+       struct irq_chip *(*get_irq_chip)(unsigned long trigger);
+
+       unsigned int (*__read)(char __iomem *iosapic, unsigned int reg);
+       void (*__write)(char __iomem *iosapic, unsigned int reg, u32 val);
+};
+
+extern struct pv_iosapic_ops pv_iosapic_ops;
+
+static inline void
+iosapic_pcat_compat_init(void)
+{
+       if (pv_iosapic_ops.pcat_compat_init)
+               pv_iosapic_ops.pcat_compat_init();
+}
+
+static inline struct irq_chip*
+iosapic_get_irq_chip(unsigned long trigger)
+{
+       return pv_iosapic_ops.get_irq_chip(trigger);
+}
+
+static inline unsigned int
+__iosapic_read(char __iomem *iosapic, unsigned int reg)
+{
+       return pv_iosapic_ops.__read(iosapic, reg);
+}
+
+static inline void
+__iosapic_write(char __iomem *iosapic, unsigned int reg, u32 val)
+{
+       return pv_iosapic_ops.__write(iosapic, reg, val);
+}
+
 #endif /* !__ASSEMBLY__ */
 
 #else