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| author |   Logan Gunthorpe <logang@deltatee.com> | 2019-05-23 16:30:51 -0600 |
|---|---|---|
| committer |   Jon Mason <jdmason@kudzu.us> | 2019-06-13 08:59:34 -0400 |
| commit | d7cc609fb679e11dc2b00cbe6c50cbd37ec4bfa2 (patch) | |
| tree | d8c7682961efed1e6b99045510c5b2cf935c64a6 /include/linux/msi.h | |
| parent | ntb_hw_switchtec: Fix setup MW with failure bug (diff) | |
| download | linux-dev-d7cc609fb679e11dc2b00cbe6c50cbd37ec4bfa2.tar.xz linux-dev-d7cc609fb679e11dc2b00cbe6c50cbd37ec4bfa2.zip | |
PCI/MSI: Support allocating virtual MSI interrupts
For NTB devices, we want to be able to trigger MSI interrupts
through a memory window. In these cases we may want to use
more interrupts than the NTB PCI device has available in its MSI-X
table.
We allow for this by creating a new 'virtual' interrupt. These
interrupts are allocated as usual but are not programmed into the
MSI-X table (as there may not be space for them).
The MSI address and data will then handled through an NTB MSI library
introduced later in this series.
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
Diffstat (limited to 'include/linux/msi.h')
| -rw-r--r-- | include/linux/msi.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/msi.h b/include/linux/msi.h index d48e919d55ae..8ad679e9d9c0 100644 --- a/include/linux/msi.h +++ b/include/linux/msi.h @@ -64,6 +64,10 @@ struct ti_sci_inta_msi_desc { * @msg: The last set MSI message cached for reuse * @affinity: Optional pointer to a cpu affinity mask for this descriptor * + * @write_msi_msg: Callback that may be called when the MSI message + * address or data changes + * @write_msi_msg_data: Data parameter for the callback. + * * @masked: [PCI MSI/X] Mask bits * @is_msix: [PCI MSI/X] True if MSI-X * @multiple: [PCI MSI/X] log2 num of messages allocated @@ -90,6 +94,9 @@ struct msi_desc { const void *iommu_cookie; #endif + void (*write_msi_msg)(struct msi_desc *entry, void *data); + void *write_msi_msg_data; + union { /* PCI MSI/X specific data */ struct { @@ -100,6 +107,7 @@ struct msi_desc { u8 multi_cap : 3; u8 maskbit : 1; u8 is_64 : 1; + u8 is_virtual : 1; u16 entry_nr; unsigned default_irq; } msi_attrib; |