linux-kernel - [PATCH char-misc 1/1] Drivers: hv: vmbus: Add hooks for per-CPU IRQ

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Date:   Sun, 11 Mar 2018 20:49:02 -0700
From:   Michael Kelley <mhkelley58@...il.com>
To:     gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        devel@...uxdriverproject.org, olaf@...fle.de, apw@...onical.com,
        vkuznets@...hat.com, jasowang@...hat.com,
        leann.ogasawara@...onical.com, marcelo.cerri@...onical.com,
        sthemmin@...rosoft.com, kys@...rosoft.com
Cc:     mikelley@...rosoft.com
Subject: [PATCH char-misc 1/1] Drivers: hv: vmbus: Add hooks for per-CPU IRQ

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.  They are being added as staging for upcoming code for
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 <mikelley@...rosoft.com>
---
 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 e73c4d0..b73b839 100644
--- a/arch/x86/include/asm/mshyperv.h
+++ b/arch/x86/include/asm/mshyperv.h
@@ -168,6 +168,10 @@ 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/disabled */
+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 b1f6793..6a3ea4e 100644
--- a/drivers/hv/hv.c
+++ b/drivers/hv/hv.c
@@ -299,6 +299,7 @@ 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(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT,
 			    shared_sint.as_uint64);
 
@@ -433,6 +434,7 @@ int hv_synic_cleanup(unsigned int cpu)
 	hv_get_synic_state(sctrl.as_uint64);
 	sctrl.enable = 0;
 	hv_set_synic_state(sctrl.as_uint64);
+	hv_disable_vmbus_irq();
 
 	return 0;
 }
-- 
2.7.4