msi/msix: added functions to API to set up message address, and data

Ok, another try. Is it any better now? :)


Normally QEMU expects the guest to initialize MSI/MSIX vectors.
However on POWER the guest uses RTAS subsystem to configure MSI/MSIX and
does not write these vectors to device's config space or MSIX BAR.

On the other hand, msi_notify()/msix_notify() write to these vectors to
signal the guest about an interrupt so we have to write correct vectors
to the devices in order not to change every user of MSI/MSIX.

The first aim is to support MSIX for virtio-pci on POWER. There is
another patch for POWER coming which introduces a special memory region
where MSI/MSIX vectors point to.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
---
 hw/msi.c  |   14 ++++++++++++++
 hw/msi.h  |    1 +
 hw/msix.c |    8 ++++++++
 hw/msix.h |    3 +++
 4 files changed, 26 insertions(+)

On 2012-06-21 08:46, Alexey Kardashevskiy wrote:
> 
> Ok, another try. Is it any better now? :)

No - posted the old version accidentally?

Jan

> 
> 
> Normally QEMU expects the guest to initialize MSI/MSIX vectors.
> However on POWER the guest uses RTAS subsystem to configure MSI/MSIX and
> does not write these vectors to device's config space or MSIX BAR.
> 
> On the other hand, msi_notify()/msix_notify() write to these vectors to
> signal the guest about an interrupt so we have to write correct vectors
> to the devices in order not to change every user of MSI/MSIX.
> 
> The first aim is to support MSIX for virtio-pci on POWER. There is
> another patch for POWER coming which introduces a special memory region
> where MSI/MSIX vectors point to.
> 
> Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
> ---
>  hw/msi.c  |   14 ++++++++++++++
>  hw/msi.h  |    1 +
>  hw/msix.c |    8 ++++++++
>  hw/msix.h |    3 +++
>  4 files changed, 26 insertions(+)
> 
> diff --git a/hw/msi.c b/hw/msi.c
> index 5233204..c7b3e6a 100644
> --- a/hw/msi.c
> +++ b/hw/msi.c
> @@ -363,3 +363,17 @@ unsigned int msi_nr_vectors_allocated(const PCIDevice *dev)
>      uint16_t flags = pci_get_word(dev->config + msi_flags_off(dev));
>      return msi_nr_vectors(flags);
>  }
> +
> +void msi_set_address_data(PCIDevice *dev, uint64_t address, uint16_t data)
> +{
> +    uint16_t flags = pci_get_word(dev->config + msi_flags_off(dev));
> +    bool msi64bit = flags & PCI_MSI_FLAGS_64BIT;
> +
> +    if (msi64bit) {
> +        pci_set_quad(dev->config + msi_address_lo_off(dev), address);
> +    } else {
> +        pci_set_long(dev->config + msi_address_lo_off(dev), address);
> +    }
> +    pci_set_word(dev->config + msi_data_off(dev, msi64bit), data);
> +}
> +
> diff --git a/hw/msi.h b/hw/msi.h
> index 75747ab..353386e 100644
> --- a/hw/msi.h
> +++ b/hw/msi.h
> @@ -39,6 +39,7 @@ void msi_reset(PCIDevice *dev);
>  void msi_notify(PCIDevice *dev, unsigned int vector);
>  void msi_write_config(PCIDevice *dev, uint32_t addr, uint32_t val, int len);
>  unsigned int msi_nr_vectors_allocated(const PCIDevice *dev);
> +void msi_set_address_data(PCIDevice *dev, uint64_t address, uint16_t data);
>  
>  static inline bool msi_present(const PCIDevice *dev)
>  {
> diff --git a/hw/msix.c b/hw/msix.c
> index ded3c55..08e773d 100644
> --- a/hw/msix.c
> +++ b/hw/msix.c
> @@ -526,3 +526,11 @@ void msix_unset_vector_notifiers(PCIDevice *dev)
>      dev->msix_vector_use_notifier = NULL;
>      dev->msix_vector_release_notifier = NULL;
>  }
> +void msix_set_address_data(PCIDevice *dev, int vector,
> +                           uint64_t address, uint32_t data)
> +{
> +    uint8_t *table_entry = dev->msix_table_page + vector * PCI_MSIX_ENTRY_SIZE;
> +    pci_set_quad(table_entry + PCI_MSIX_ENTRY_LOWER_ADDR, address);
> +    pci_set_long(table_entry + PCI_MSIX_ENTRY_DATA, data);
> +    table_entry[PCI_MSIX_ENTRY_VECTOR_CTRL] &= ~PCI_MSIX_ENTRY_CTRL_MASKBIT;
> +}
> diff --git a/hw/msix.h b/hw/msix.h
> index 50aee82..901f101 100644
> --- a/hw/msix.h
> +++ b/hw/msix.h
> @@ -35,4 +35,7 @@ int msix_set_vector_notifiers(PCIDevice *dev,
>                                MSIVectorUseNotifier use_notifier,
>                                MSIVectorReleaseNotifier release_notifier);
>  void msix_unset_vector_notifiers(PCIDevice *dev);
> +void msix_set_address_data(PCIDevice *dev, int vector,
> +                           uint64_t address, uint32_t data);
> +
>  #endif
>