| Message ID | 20200203050313.69247-4-boqun.feng@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | PCI: hv: Generify pci-hyperv.c | expand |
On Mon, Feb 03, 2020 at 01:03:13PM +0800, Boqun Feng wrote: > Add a new structure (hv_msi_entry), which is also defined int tlfs, to s/int/in the/ ? > describe the msi entry for HVCALL_RETARGET_INTERRUPT. The structure is > needed because its layout may be different from architecture to > architecture. > > Also add a new generic interface hv_set_msi_address_from_desc() to allow > different archs to set the msi address from msi_desc. > > No functional change, only preparation for the future support of virtual > PCI on non-x86 architectures. > > Signed-off-by: Boqun Feng (Microsoft) <boqun.feng@gmail.com> > --- > arch/x86/include/asm/hyperv-tlfs.h | 11 +++++++++-- > arch/x86/include/asm/mshyperv.h | 5 +++++ > drivers/pci/controller/pci-hyperv.c | 4 ++-- > 3 files changed, 16 insertions(+), 4 deletions(-) > > diff --git a/arch/x86/include/asm/hyperv-tlfs.h b/arch/x86/include/asm/hyperv-tlfs.h > index 4a76e442481a..953b3ad38746 100644 > --- a/arch/x86/include/asm/hyperv-tlfs.h > +++ b/arch/x86/include/asm/hyperv-tlfs.h > @@ -912,11 +912,18 @@ struct hv_partition_assist_pg { > u32 tlb_lock_count; > }; > > +union hv_msi_entry { > + u64 as_uint64; > + struct { > + u32 address; > + u32 data; > + } __packed; > +}; > + > struct hv_interrupt_entry { > u32 source; /* 1 for MSI(-X) */ > u32 reserved1; > - u32 address; > - u32 data; > + union hv_msi_entry msi_entry; > } __packed; > > /* > diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h > index 6b79515abb82..3bdaa3b6e68f 100644 > --- a/arch/x86/include/asm/mshyperv.h > +++ b/arch/x86/include/asm/mshyperv.h > @@ -240,6 +240,11 @@ bool hv_vcpu_is_preempted(int vcpu); > static inline void hv_apic_init(void) {} > #endif > > +#define hv_set_msi_address_from_desc(msi_entry, msi_desc) \ > +do { \ > + (msi_entry)->address = (msi_desc)->msg.address_lo; \ > +} while (0) Given that this is a single statement, is there really a need for the do ; while(0) ? > + > #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 0d9b74503577..2240f2b3643e 100644 > --- a/drivers/pci/controller/pci-hyperv.c > +++ b/drivers/pci/controller/pci-hyperv.c > @@ -1170,8 +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(¶ms->int_entry.msi_entry, msi_desc); > + params->int_entry.msi_entry.data = msi_desc->msg.data; If the layout may differ, then don't we also need a wrapper for data? Thanks, Andrew Murray > params->device_id = (hbus->hdev->dev_instance.b[5] << 24) | > (hbus->hdev->dev_instance.b[4] << 16) | > (hbus->hdev->dev_instance.b[7] << 8) | > -- > 2.24.1 >
On Mon, Feb 03, 2020 at 09:51:40AM +0000, Andrew Murray wrote: > On Mon, Feb 03, 2020 at 01:03:13PM +0800, Boqun Feng wrote: > > Add a new structure (hv_msi_entry), which is also defined int tlfs, to > > s/int/in the/ ? > Good catch, will fix. > > describe the msi entry for HVCALL_RETARGET_INTERRUPT. The structure is > > needed because its layout may be different from architecture to > > architecture. > > > > Also add a new generic interface hv_set_msi_address_from_desc() to allow > > different archs to set the msi address from msi_desc. > > > > No functional change, only preparation for the future support of virtual > > PCI on non-x86 architectures. > > > > Signed-off-by: Boqun Feng (Microsoft) <boqun.feng@gmail.com> > > --- > > arch/x86/include/asm/hyperv-tlfs.h | 11 +++++++++-- > > arch/x86/include/asm/mshyperv.h | 5 +++++ > > drivers/pci/controller/pci-hyperv.c | 4 ++-- > > 3 files changed, 16 insertions(+), 4 deletions(-) > > > > diff --git a/arch/x86/include/asm/hyperv-tlfs.h b/arch/x86/include/asm/hyperv-tlfs.h > > index 4a76e442481a..953b3ad38746 100644 > > --- a/arch/x86/include/asm/hyperv-tlfs.h > > +++ b/arch/x86/include/asm/hyperv-tlfs.h > > @@ -912,11 +912,18 @@ struct hv_partition_assist_pg { > > u32 tlb_lock_count; > > }; > > > > +union hv_msi_entry { > > + u64 as_uint64; > > + struct { > > + u32 address; > > + u32 data; > > + } __packed; > > +}; > > + > > struct hv_interrupt_entry { > > u32 source; /* 1 for MSI(-X) */ > > u32 reserved1; > > - u32 address; > > - u32 data; > > + union hv_msi_entry msi_entry; > > } __packed; > > > > /* > > diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h > > index 6b79515abb82..3bdaa3b6e68f 100644 > > --- a/arch/x86/include/asm/mshyperv.h > > +++ b/arch/x86/include/asm/mshyperv.h > > @@ -240,6 +240,11 @@ bool hv_vcpu_is_preempted(int vcpu); > > static inline void hv_apic_init(void) {} > > #endif > > > > +#define hv_set_msi_address_from_desc(msi_entry, msi_desc) \ > > +do { \ > > + (msi_entry)->address = (msi_desc)->msg.address_lo; \ > > +} while (0) > > Given that this is a single statement, is there really a need for the do ; while(0) ? > I choose to use do ; while (0) because I don't want code like the following to be able to compile: hv_set_msi_address_from_desc(...) /* semicolon is missing */ a = b; But now think more about this, I think it's probably better to define this as a function.. > > > + > > #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 0d9b74503577..2240f2b3643e 100644 > > --- a/drivers/pci/controller/pci-hyperv.c > > +++ b/drivers/pci/controller/pci-hyperv.c > > @@ -1170,8 +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(¶ms->int_entry.msi_entry, msi_desc); > > + params->int_entry.msi_entry.data = msi_desc->msg.data; > > If the layout may differ, then don't we also need a wrapper for data? > On x86 hv_msi_entry is: { u32 address; u32 data; } and on ARM64 it is: { u64 address; u32 data; u32 reserved; } So currently, setting msi_entry.data doesn't need a wrapper for different archs. But now you mention it, probably a better way is to provide a wrapper hv_set_msi_entry_from_desc(), which sets both address and data instead of hv_set_msi_address_from_desc(). Thanks for looking into the whole patchset! Regards, Boqun > Thanks, > > Andrew Murray > > > params->device_id = (hbus->hdev->dev_instance.b[5] << 24) | > > (hbus->hdev->dev_instance.b[4] << 16) | > > (hbus->hdev->dev_instance.b[7] << 8) | > > -- > > 2.24.1 > >
Boqun Feng <boqun.feng@gmail.com> writes: > /* > diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h > index 6b79515abb82..3bdaa3b6e68f 100644 > --- a/arch/x86/include/asm/mshyperv.h > +++ b/arch/x86/include/asm/mshyperv.h > @@ -240,6 +240,11 @@ bool hv_vcpu_is_preempted(int vcpu); > static inline void hv_apic_init(void) {} > #endif > > +#define hv_set_msi_address_from_desc(msi_entry, msi_desc) \ > +do { \ > + (msi_entry)->address = (msi_desc)->msg.address_lo; \ > +} while (0) Any reason why this needs to be a macro? inlines are preferrred. They are typesafe and readable. Thanks, tglx
On Mon, Feb 03, 2020 at 03:41:52PM +0100, Thomas Gleixner wrote: > Boqun Feng <boqun.feng@gmail.com> writes: > > /* > > diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h > > index 6b79515abb82..3bdaa3b6e68f 100644 > > --- a/arch/x86/include/asm/mshyperv.h > > +++ b/arch/x86/include/asm/mshyperv.h > > @@ -240,6 +240,11 @@ bool hv_vcpu_is_preempted(int vcpu); > > static inline void hv_apic_init(void) {} > > #endif > > > > +#define hv_set_msi_address_from_desc(msi_entry, msi_desc) \ > > +do { \ > > + (msi_entry)->address = (msi_desc)->msg.address_lo; \ > > +} while (0) > > Any reason why this needs to be a macro? inlines are preferrred. They Making it an inline function will require #include <linux/msi.h> in mshyperv.h, which I was trying to avoid. But now it seems pointless. I will make it an inline in next version. Regards, Boqun > are typesafe and readable. > > Thanks, > > tglx
diff --git a/arch/x86/include/asm/hyperv-tlfs.h b/arch/x86/include/asm/hyperv-tlfs.h index 4a76e442481a..953b3ad38746 100644 --- a/arch/x86/include/asm/hyperv-tlfs.h +++ b/arch/x86/include/asm/hyperv-tlfs.h @@ -912,11 +912,18 @@ struct hv_partition_assist_pg { u32 tlb_lock_count; }; +union hv_msi_entry { + u64 as_uint64; + struct { + u32 address; + u32 data; + } __packed; +}; + struct hv_interrupt_entry { u32 source; /* 1 for MSI(-X) */ u32 reserved1; - u32 address; - u32 data; + union hv_msi_entry msi_entry; } __packed; /* diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h index 6b79515abb82..3bdaa3b6e68f 100644 --- a/arch/x86/include/asm/mshyperv.h +++ b/arch/x86/include/asm/mshyperv.h @@ -240,6 +240,11 @@ bool hv_vcpu_is_preempted(int vcpu); static inline void hv_apic_init(void) {} #endif +#define hv_set_msi_address_from_desc(msi_entry, msi_desc) \ +do { \ + (msi_entry)->address = (msi_desc)->msg.address_lo; \ +} while (0) + #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 0d9b74503577..2240f2b3643e 100644 --- a/drivers/pci/controller/pci-hyperv.c +++ b/drivers/pci/controller/pci-hyperv.c @@ -1170,8 +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(¶ms->int_entry.msi_entry, msi_desc); + 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) |
Add a new structure (hv_msi_entry), which is also defined int tlfs, to describe the msi entry for HVCALL_RETARGET_INTERRUPT. The structure is needed because its layout may be different from architecture to architecture. Also add a new generic interface hv_set_msi_address_from_desc() to allow different archs to set the msi address from msi_desc. No functional change, only preparation for the future support of virtual PCI on non-x86 architectures. Signed-off-by: Boqun Feng (Microsoft) <boqun.feng@gmail.com> --- arch/x86/include/asm/hyperv-tlfs.h | 11 +++++++++-- arch/x86/include/asm/mshyperv.h | 5 +++++ drivers/pci/controller/pci-hyperv.c | 4 ++-- 3 files changed, 16 insertions(+), 4 deletions(-)