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.
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| @@ -64,6 +64,10 @@ struct ti_sci_inta_msi_desc { · 63 unmodified lines | ||
| 64 | 64 | * @msg: The last set MSI message cached for reuse |
| 65 | 65 | * @affinity: Optional pointer to a cpu affinity mask for this descriptor |
| 66 | 66 | * |
| 67 | + * @write_msi_msg: Callback that may be called when the MSI message | |
| 68 | + * address or data changes | |
| 69 | + * @write_msi_msg_data: Data parameter for the callback. | |
| 70 | + * | |
| 67 | 71 | * @masked: [PCI MSI/X] Mask bits |
| 68 | 72 | * @is_msix: [PCI MSI/X] True if MSI-X |
| 69 | 73 | * @multiple: [PCI MSI/X] log2 num of messages allocated |
| @@ -90,6 +94,9 @@ struct msi_desc { · 20 unmodified lines | ||
| 90 | 94 | const void *iommu_cookie; |
| 91 | 95 | #endif |
| 92 | 96 | |
| 97 | + void (*write_msi_msg)(struct msi_desc *entry, void *data); | |
| 98 | + void *write_msi_msg_data; | |
| 99 | + | |
| 93 | 100 | union { |
| 94 | 101 | /* PCI MSI/X specific data */ |
| 95 | 102 | struct { |
| @@ -100,6 +107,7 @@ struct msi_desc { · 4 unmodified lines | ||
| 100 | 107 | u8 multi_cap : 3; |
| 101 | 108 | u8 maskbit : 1; |
| 102 | 109 | u8 is_64 : 1; |
| 110 | + u8 is_virtual : 1; | |
| 103 | 111 | u16 entry_nr; |
| 104 | 112 | unsigned default_irq; |
| 105 | 113 | } msi_attrib; |
| @@ -1362,6 +1362,15 @@ int pci_set_vga_state(struct pci_dev *pdev, bool decode, · 1361 unmodified lines | ||
| 1362 | 1362 | #define PCI_IRQ_MSI (1 << 1) /* Allow MSI interrupts */ |
| 1363 | 1363 | #define PCI_IRQ_MSIX (1 << 2) /* Allow MSI-X interrupts */ |
| 1364 | 1364 | #define PCI_IRQ_AFFINITY (1 << 3) /* Auto-assign affinity */ |
| 1365 | + | |
| 1366 | +/* | |
| 1367 | + * Virtual interrupts allow for more interrupts to be allocated | |
| 1368 | + * than the device has interrupts for. These are not programmed | |
| 1369 | + * into the device's MSI-X table and must be handled by some | |
| 1370 | + * other driver means. | |
| 1371 | + */ | |
| 1372 | +#define PCI_IRQ_VIRTUAL (1 << 4) | |
| 1373 | + | |
| 1365 | 1374 | #define PCI_IRQ_ALL_TYPES \ |
| 1366 | 1375 | (PCI_IRQ_LEGACY | PCI_IRQ_MSI | PCI_IRQ_MSIX) |
| 1367 | 1376 | |