diff options
| author | Michael Kelley <mikelley@microsoft.com> | 2021-03-02 13:38:18 -0800 |
|---|---|---|
| committer | Wei Liu <wei.liu@kernel.org> | 2021-03-08 17:33:00 +0000 |
| commit | d608715d4771cf2d63de07a5d7b026b6f52a70a5 (patch) | |
| tree | 73a567821ae3e494a4df3c3f08deffb6b3d8afdc /drivers/hv/hv.c | |
| parent | 946f4b8680b8ad177f6489e023a1d95e82d502e2 (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.c | 8 |
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); } |