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Drivers: hv: vmbus: Move handling of VMbus interrupts

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VMbus interrupts are most naturally modelled as per-cpu IRQs.  But
because x86/x64 doesn't have per-cpu IRQs, the core VMbus interrupt
handling machinery is done in code under arch/x86 and Linux IRQs are
not used.  Adding support for ARM64 means adding equivalent code
using per-cpu IRQs under arch/arm64.

A better model is to treat per-cpu IRQs as the normal path (which it is
for modern architectures), and the x86/x64 path as the exception.  Do this
by incorporating standard Linux per-cpu IRQ allocation into the main VMbus
driver, and bypassing it in the x86/x64 exception case. For x86/x64,
special case code is retained under arch/x86, but no VMbus interrupt
handling code is needed under arch/arm64.

No functional change.

Signed-off-by: Michael Kelley <mikelley@microsoft.com>
Reviewed-by: Boqun Feng <boqun.feng@gmail.com>
Link: https://lore.kernel.org/r/1614721102-2241-7-git-send-email-mikelley@microsoft.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
This commit is contained in:
Michael Kelley 2021-03-02 13:38:18 -08:00 • committed by Wei Liu
parent 946f4b8680
commit d608715d47
5 changed files with 70 additions and 22 deletions
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7
include/asm-generic/mshyperv.h
View file

@ -92,10 +92,8 @@ static inline void vmbus_signal_eom(struct hv_message *msg, u32 old_msg_type)
}
}
int hv_setup_vmbus_irq(int irq, void (*handler)(void));
void hv_remove_vmbus_irq(void);
void hv_enable_vmbus_irq(void);
void hv_disable_vmbus_irq(void);
void hv_setup_vmbus_handler(void (*handler)(void));
void hv_remove_vmbus_handler(void);
void hv_setup_kexec_handler(void (*handler)(void));
void hv_remove_kexec_handler(void);
@ -103,6 +101,7 @@ void hv_setup_crash_handler(void (*handler)(struct pt_regs *regs));
void hv_remove_crash_handler(void);
extern int vmbus_interrupt;
extern int vmbus_irq;
#if IS_ENABLED(CONFIG_HYPERV)
/*