From: kys@linuxonhyperv.com (kys at linuxonhyperv.com) Date: Thu, 22 Nov 2018 03:10:58 +0000 Subject: [PATCH 3/4] Drivers: hv: vmbus: Add hooks for per-CPU IRQ In-Reply-To: <20181122031059.16338-1-kys@linuxonhyperv.com> References: <20181122030914.16274-1-kys@linuxonhyperv.com> <20181122031059.16338-1-kys@linuxonhyperv.com> Message-ID: <20181122031059.16338-3-kys@linuxonhyperv.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org From: Michael Kelley Add hooks to enable/disable a per-CPU IRQ for VMbus. These hooks are in the architecture independent setup and shutdown paths for Hyper-V, and are needed by Linux guests on Hyper-V on ARM64. The x86/x64 implementation is null because VMbus interrupts on x86/x64 don't use an IRQ. Signed-off-by: Michael Kelley Signed-off-by: K. Y. Srinivasan --- arch/x86/include/asm/mshyperv.h | 4 ++++ drivers/hv/hv.c | 2 ++ 2 files changed, 6 insertions(+) diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h index 0d6271cce198..8d97bd3a13a6 100644 --- a/arch/x86/include/asm/mshyperv.h +++ b/arch/x86/include/asm/mshyperv.h @@ -109,6 +109,10 @@ void hyperv_vector_handler(struct pt_regs *regs); void hv_setup_vmbus_irq(void (*handler)(void)); void hv_remove_vmbus_irq(void); +/* On x86/x64, there isn't a real IRQ to be enabled/disable */ +static inline void hv_enable_vmbus_irq(void) {} +static inline void hv_disable_vmbus_irq(void) {} + void hv_setup_kexec_handler(void (*handler)(void)); void hv_remove_kexec_handler(void); void hv_setup_crash_handler(void (*handler)(struct pt_regs *regs)); diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c index 166c2501de17..d0bb09a4bd73 100644 --- a/drivers/hv/hv.c +++ b/drivers/hv/hv.c @@ -307,6 +307,7 @@ int hv_synic_init(unsigned int cpu) hv_set_siefp(siefp.as_uint64); /* Setup the shared SINT. */ + hv_enable_vmbus_irq(); hv_get_synint_state(VMBUS_MESSAGE_SINT, shared_sint.as_uint64); shared_sint.vector = HYPERVISOR_CALLBACK_VECTOR; @@ -434,6 +435,7 @@ int hv_synic_cleanup(unsigned int cpu) /* Disable the global synic bit */ sctrl.enable = 0; hv_set_synic_state(sctrl.as_uint64); + hv_disable_vmbus_irq(); return 0; } -- 2.19.1