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Diffstat (limited to 'arch/x86/include/asm/apic.h')
-rw-r--r--arch/x86/include/asm/apic.h23
1 files changed, 20 insertions, 3 deletions
diff --git a/arch/x86/include/asm/apic.h b/arch/x86/include/asm/apic.h
index d85410171260..eaff4790ed96 100644
--- a/arch/x86/include/asm/apic.h
+++ b/arch/x86/include/asm/apic.h
@@ -138,6 +138,11 @@ static inline void native_apic_msr_write(u32 reg, u32 v)
wrmsr(APIC_BASE_MSR + (reg >> 4), v, 0);
}
+static inline void native_apic_msr_eoi_write(u32 reg, u32 v)
+{
+ wrmsr(APIC_BASE_MSR + (APIC_EOI >> 4), APIC_EOI_ACK, 0);
+}
+
static inline u32 native_apic_msr_read(u32 reg)
{
u64 msr;
@@ -351,6 +356,14 @@ struct apic {
/* apic ops */
u32 (*read)(u32 reg);
void (*write)(u32 reg, u32 v);
+ /*
+ * ->eoi_write() has the same signature as ->write().
+ *
+ * Drivers can support both ->eoi_write() and ->write() by passing the same
+ * callback value. Kernel can override ->eoi_write() and fall back
+ * on write for EOI.
+ */
+ void (*eoi_write)(u32 reg, u32 v);
u64 (*icr_read)(void);
void (*icr_write)(u32 low, u32 high);
void (*wait_icr_idle)(void);
@@ -426,6 +439,11 @@ static inline void apic_write(u32 reg, u32 val)
apic->write(reg, val);
}
+static inline void apic_eoi(void)
+{
+ apic->eoi_write(APIC_EOI, APIC_EOI_ACK);
+}
+
static inline u64 apic_icr_read(void)
{
return apic->icr_read();
@@ -450,6 +468,7 @@ static inline u32 safe_apic_wait_icr_idle(void)
static inline u32 apic_read(u32 reg) { return 0; }
static inline void apic_write(u32 reg, u32 val) { }
+static inline void apic_eoi(void) { }
static inline u64 apic_icr_read(void) { return 0; }
static inline void apic_icr_write(u32 low, u32 high) { }
static inline void apic_wait_icr_idle(void) { }
@@ -463,9 +482,7 @@ static inline void ack_APIC_irq(void)
* ack_APIC_irq() actually gets compiled as a single instruction
* ... yummie.
*/
-
- /* Docs say use 0 for future compatibility */
- apic_write(APIC_EOI, 0);
+ apic_eoi();
}
static inline unsigned default_get_apic_id(unsigned long x)