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authorMichael Kelley <mikelley@microsoft.com>2021-03-02 13:38:18 -0800
committerWei Liu <wei.liu@kernel.org>2021-03-08 17:33:00 +0000
commitd608715d4771cf2d63de07a5d7b026b6f52a70a5 (patch)
tree73a567821ae3e494a4df3c3f08deffb6b3d8afdc /drivers/hv/hv.c
parent946f4b8680b8ad177f6489e023a1d95e82d502e2 (diff)
Drivers: hv: vmbus: Move handling of VMbus interrupts
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>
Diffstat (limited to 'drivers/hv/hv.c')
-rw-r--r--drivers/hv/hv.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c
index afe7a62b447f..917b29e873c5 100644
--- a/drivers/hv/hv.c
+++ b/drivers/hv/hv.c
@@ -16,6 +16,7 @@
#include <linux/version.h>
#include <linux/random.h>
#include <linux/clockchips.h>
+#include <linux/interrupt.h>
#include <clocksource/hyperv_timer.h>
#include <asm/mshyperv.h>
#include "hyperv_vmbus.h"
@@ -214,10 +215,12 @@ void hv_synic_enable_regs(unsigned int cpu)
hv_set_register(HV_REGISTER_SIEFP, siefp.as_uint64);
/* Setup the shared SINT. */
+ if (vmbus_irq != -1)
+ enable_percpu_irq(vmbus_irq, 0);
shared_sint.as_uint64 = hv_get_register(HV_REGISTER_SINT0 +
VMBUS_MESSAGE_SINT);
- shared_sint.vector = hv_get_vector();
+ shared_sint.vector = vmbus_interrupt;
shared_sint.masked = false;
/*
@@ -285,6 +288,9 @@ void hv_synic_disable_regs(unsigned int cpu)
sctrl.as_uint64 = hv_get_register(HV_REGISTER_SCONTROL);
sctrl.enable = 0;
hv_set_register(HV_REGISTER_SCONTROL, sctrl.as_uint64);
+
+ if (vmbus_irq != -1)
+ disable_percpu_irq(vmbus_irq);
}