linux-kernel - Re: [PATCH 1/1] Drivers: hv: vmbus: Add parsing of VMbus interrupt in ACPI DSDT

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Date:   Fri, 14 Aug 2020 13:44:09 +0000
From:   Wei Liu <wei.liu@...nel.org>
To:     Michael Kelley <mikelley@...rosoft.com>
Cc:     Wei Liu <wei.liu@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        KY Srinivasan <kys@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "bp@...en8.de" <bp@...en8.de>, "x86@...nel.org" <x86@...nel.org>,
        "hpa@...or.com" <hpa@...or.com>
Subject: Re: [PATCH 1/1] Drivers: hv: vmbus: Add parsing of VMbus interrupt
 in ACPI DSDT

On Fri, Aug 14, 2020 at 01:32:11PM +0000, Michael Kelley wrote:
> From: Wei Liu <wei.liu@...nel.org> Sent: Friday, August 14, 2020 2:44 AM
> > 
> > On Thu, Aug 13, 2020 at 04:51:19PM -0700, Michael Kelley wrote:
> > > On ARM64, Hyper-V now specifies the interrupt to be used by VMbus
> > > in the ACPI DSDT.  This information is not used on x86 because the
> > > interrupt vector must be hardcoded.  But update the generic
> > > VMbus driver to do the parsing and pass the information to the
> > > architecture specific code that sets up the Linux IRQ.  Update
> > > consumers of the interrupt to get it from an architecture specific
> > > function.
> > >
> > > Signed-off-by: Michael Kelley <mikelley@...rosoft.com>
> > > ---
> > >  arch/x86/include/asm/mshyperv.h |  1 +
> > >  arch/x86/kernel/cpu/mshyperv.c  |  3 ++-
> > >  drivers/hv/hv.c                 |  2 +-
> > >  drivers/hv/vmbus_drv.c          | 30 +++++++++++++++++++++++++++---
> > >  include/asm-generic/mshyperv.h  |  4 +++-
> > >  5 files changed, 34 insertions(+), 6 deletions(-)
> > >
> > > diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h
> > > index 4f77b8f..ffc2899 100644
> > > --- a/arch/x86/include/asm/mshyperv.h
> > > +++ b/arch/x86/include/asm/mshyperv.h
> > > @@ -54,6 +54,7 @@ typedef int (*hyperv_fill_flush_list_func)(
> > >  #define hv_enable_vdso_clocksource() \
> > >  	vclocks_set_used(VDSO_CLOCKMODE_HVCLOCK);
> > >  #define hv_get_raw_timer() rdtsc_ordered()
> > > +#define hv_get_vector() HYPERVISOR_CALLBACK_VECTOR
> > >
> > >  /*
> > >   * Reference to pv_ops must be inline so objtool
> > > diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
> > > index 3112544..538aa87 100644
> > > --- a/arch/x86/kernel/cpu/mshyperv.c
> > > +++ b/arch/x86/kernel/cpu/mshyperv.c
> > > @@ -55,9 +55,10 @@
> > >  	set_irq_regs(old_regs);
> > >  }
> > >
> > > -void hv_setup_vmbus_irq(void (*handler)(void))
> > > +int hv_setup_vmbus_irq(int irq, void (*handler)(void))
> > >  {
> > 
> > irq is not used here. Did you perhaps forget to commit a chunk of code?
> 
> No, this is correct.  Per the commit message, the irq information
> parsed from the DSDT is not used in the x86 code.  But it is used on the
> ARM64 side.  I should add a comment to that effect here in the x86
> code so there's no confusion.

I see. The function for Arm64 is not here yet.

If you want to send a new version, feel free. I can also queue this
version up. I don't think lacking a comment here is a blocking issue.

Wei.

> 
> Michael
> 
> > 
> > >  	vmbus_handler = handler;
> > > +	return 0;
> > >  }
> > 
> > Wei.