linux-kernel - Re: [PATCH 2/2] pci: hyperv: Move retarget related struct definitions into tlfs

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Date:   Thu, 23 Jan 2020 18:40:07 +0800
From:   Boqun Feng <boqun.feng@...il.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>
Cc:     Michael Kelley <mikelley@...rosoft.com>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Sasha Levin <sashal@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Andrew Murray <andrew.murray@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        "open list:PCI NATIVE HOST BRIDGE AND ENDPOINT DRIVERS" 
        <linux-pci@...r.kernel.org>, linux-hyperv@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] pci: hyperv: Move retarget related struct
 definitions into tlfs

On Tue, Jan 21, 2020 at 10:25:47AM +0100, Vitaly Kuznetsov wrote:
[...]
> >  
> > +#if IS_ENABLED(CONFIG_PCI_HYPERV)
> > +#define hv_set_msi_address_from_desc(msi_entry, msi_desc)	\
> > +do {								\
> > +	(msi_entry)->address = (msi_desc)->msg.address_lo;	\
> > +} while (0)
> > +
> > +#endif /* CONFIG_PCI_HYPERV */
> 
> It seems to be pointless to put defines under #if IS_ENABLED(): in case
> it is not enabled and used you'll get a compilation error, in case it is
> enabled and not used no code is going to be generated anyways.
> 

OK I will remove the #if IS_ENABLED() in the next version.

> > +
> >  #else /* CONFIG_HYPERV */
> >  static inline void hyperv_init(void) {}
> >  static inline void hyperv_setup_mmu_ops(void) {}
> > diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/pci-hyperv.c
> > index aacfcc90d929..2240f2b3643e 100644
> > --- a/drivers/pci/controller/pci-hyperv.c
> > +++ b/drivers/pci/controller/pci-hyperv.c
> > @@ -406,36 +406,6 @@ struct pci_eject_response {
> >  
> >  static int pci_ring_size = (4 * PAGE_SIZE);
> >  
> > -struct hv_interrupt_entry {
> > -	u32	source;			/* 1 for MSI(-X) */
> > -	u32	reserved1;
> > -	u32	address;
> > -	u32	data;
> > -};
> > -
> > -/*
> > - * flags for hv_device_interrupt_target.flags
> > - */
> > -#define HV_DEVICE_INTERRUPT_TARGET_MULTICAST		1
> > -#define HV_DEVICE_INTERRUPT_TARGET_PROCESSOR_SET	2
> > -
> > -struct hv_device_interrupt_target {
> > -	u32	vector;
> > -	u32	flags;
> > -	union {
> > -		u64		 vp_mask;
> > -		struct hv_vpset vp_set;
> > -	};
> > -};
> > -
> > -struct retarget_msi_interrupt {
> > -	u64	partition_id;		/* use "self" */
> > -	u64	device_id;
> > -	struct hv_interrupt_entry int_entry;
> > -	u64	reserved2;
> > -	struct hv_device_interrupt_target int_target;
> > -} __packed __aligned(8);
> > -
> >  /*
> >   * Driver specific state.
> >   */
> > @@ -482,7 +452,7 @@ struct hv_pcibus_device {
> >  	struct workqueue_struct *wq;
> >  
> >  	/* hypercall arg, must not cross page boundary */
> > -	struct retarget_msi_interrupt retarget_msi_interrupt_params;
> > +	struct hv_retarget_device_interrupt retarget_msi_interrupt_params;
> >  
> >  	/*
> >  	 * Don't put anything here: retarget_msi_interrupt_params must be last
> > @@ -1178,7 +1148,7 @@ static void hv_irq_unmask(struct irq_data *data)
> >  {
> >  	struct msi_desc *msi_desc = irq_data_get_msi_desc(data);
> >  	struct irq_cfg *cfg = irqd_cfg(data);
> > -	struct retarget_msi_interrupt *params;
> > +	struct hv_retarget_device_interrupt *params;
> >  	struct hv_pcibus_device *hbus;
> >  	struct cpumask *dest;
> >  	cpumask_var_t tmp;
> > @@ -1200,8 +1170,8 @@ static void hv_irq_unmask(struct irq_data *data)
> >  	memset(params, 0, sizeof(*params));
> >  	params->partition_id = HV_PARTITION_ID_SELF;
> >  	params->int_entry.source = 1; /* MSI(-X) */
> > -	params->int_entry.address = msi_desc->msg.address_lo;
> > -	params->int_entry.data = msi_desc->msg.data;
> > +	hv_set_msi_address_from_desc(&params->int_entry.msi_entry, msi_desc);
> 
> I don't quite see why this hv_set_msi_address_from_desc() is needed at
> all.
> 

I will add some description in the next version, the reason that
hv_set_msi_address_from_desc() is arm64 and x86 have different
hv_interrupt_entry formats. So a generic interface is needed so that
archs can have different ways to set ->address field from msi_desc.

Regards,
Boqun

> > +	params->int_entry.msi_entry.data = msi_desc->msg.data;
> >  	params->device_id = (hbus->hdev->dev_instance.b[5] << 24) |
> >  			   (hbus->hdev->dev_instance.b[4] << 16) |
> >  			   (hbus->hdev->dev_instance.b[7] << 8) |
> 
> -- 
> Vitaly
>