From: Michael Kelley <mhkelley58@gmail.com>
To: gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org,
devel@linuxdriverproject.org, olaf@aepfle.de, apw@canonical.com,
vkuznets@redhat.com, jasowang@redhat.com,
leann.ogasawara@canonical.com, marcelo.cerri@canonical.com,
sthemmin@microsoft.com, kys@microsoft.com
Cc: mikelley@microsoft.com
Subject: [PATCH char-misc 1/1] Drivers: hv: vmbus: Add hooks for per-CPU IRQ
Date: Sun, 11 Mar 2018 20:49:02 -0700 [thread overview]
Message-ID: <1520826542-2095-1-git-send-email-mikelley@microsoft.com> (raw)
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@microsoft.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
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next reply other threads:[~2018-03-12 3:49 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-12 3:49 Michael Kelley [this message]
2018-03-12 9:18 ` Greg KH
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