diff options
Diffstat (limited to 'hw/pci/msi.c')
| -rw-r--r-- | hw/pci/msi.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/hw/pci/msi.c b/hw/pci/msi.c index a87ef4d..ed79225 100644 --- a/hw/pci/msi.c +++ b/hw/pci/msi.c @@ -165,6 +165,21 @@ bool msi_enabled(const PCIDevice *dev) PCI_MSI_FLAGS_ENABLE); } +/* + * Make PCI device @dev MSI-capable. + * Non-zero @offset puts capability MSI at that offset in PCI config + * space. + * @nr_vectors is the number of MSI vectors (1, 2, 4, 8, 16 or 32). + * If @msi64bit, make the device capable of sending a 64-bit message + * address. + * If @msi_per_vector_mask, make the device support per-vector masking. + * Return 0 on success, return -errno on error. + * + * -ENOTSUP means lacking msi support for a msi-capable platform. + * -EINVAL means capability overlap, happens when @offset is non-zero, + * also means a programming error, except device assignment, which can check + * if a real HW is broken. + */ int msi_init(struct PCIDevice *dev, uint8_t offset, unsigned int nr_vectors, bool msi64bit, bool msi_per_vector_mask) { @@ -220,7 +235,8 @@ int msi_init(struct PCIDevice *dev, uint8_t offset, pci_set_long(dev->wmask + msi_mask_off(dev, msi64bit), 0xffffffff >> (PCI_MSI_VECTORS_MAX - nr_vectors)); } - return config_offset; + + return 0; } void msi_uninit(struct PCIDevice *dev) |