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PCI/MSI: Support allocating virtual MSI interrupts

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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>
This commit is contained in:
Logan Gunthorpe
2019-05-23 16:30:51 -06:00
committed by Jon Mason
parent a944ccc3b0
commit d7cc609fb6
3 changed files with 62 additions and 9 deletions
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8
include/linux/msi.h
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@@ -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;