Author: cem Date: Tue Jun 4 02:34:59 2019 New Revision: 348598 URL: https://svnweb.freebsd.org/changeset/base/348598
Log: virtio(4): Expose PNP metadata through newbus Expose the same fields and widths from both vtio buses, even though they don't quite line up; several virtio drivers can attach to both buses, and sharing a PNP info table for both seems more convenient. In practice, I doubt any virtio driver really needs to match on anything other than bus and device_type (eliminating the unused entries for vtmmio), and also in practice device_type is << 2^16 (so far, values range from 1 to 20). So it might be fine to only expose a 16-bit device_type for PNP purposes. On the other hand, I don't see much harm in overkill here. Reviewed by: bryanv, markj (earlier version) Differential Revision: https://reviews.freebsd.org/D20406 Modified: head/sys/dev/virtio/mmio/virtio_mmio.c head/sys/dev/virtio/pci/virtio_pci.c head/sys/dev/virtio/virtio.c head/sys/dev/virtio/virtio.h Modified: head/sys/dev/virtio/mmio/virtio_mmio.c ============================================================================== --- head/sys/dev/virtio/mmio/virtio_mmio.c Tue Jun 4 01:00:30 2019 (r348597) +++ head/sys/dev/virtio/mmio/virtio_mmio.c Tue Jun 4 02:34:59 2019 (r348598) @@ -145,6 +145,7 @@ static device_method_t vtmmio_methods[] = { /* Bus interface. */ DEVMETHOD(bus_driver_added, vtmmio_driver_added), DEVMETHOD(bus_child_detached, vtmmio_child_detached), + DEVMETHOD(bus_child_pnpinfo_str, virtio_child_pnpinfo_str), DEVMETHOD(bus_read_ivar, vtmmio_read_ivar), DEVMETHOD(bus_write_ivar, vtmmio_write_ivar), @@ -331,6 +332,14 @@ vtmmio_read_ivar(device_t dev, device_t child, int ind break; case VIRTIO_IVAR_VENDOR: *result = vtmmio_read_config_4(sc, VIRTIO_MMIO_VENDOR_ID); + break; + case VIRTIO_IVAR_SUBVENDOR: + case VIRTIO_IVAR_DEVICE: + /* + * Dummy value for fields not present in this bus. Used by + * bus-agnostic virtio_child_pnpinfo_str. + */ + *result = 0; break; default: return (ENOENT); Modified: head/sys/dev/virtio/pci/virtio_pci.c ============================================================================== --- head/sys/dev/virtio/pci/virtio_pci.c Tue Jun 4 01:00:30 2019 (r348597) +++ head/sys/dev/virtio/pci/virtio_pci.c Tue Jun 4 02:34:59 2019 (r348598) @@ -200,6 +200,7 @@ static device_method_t vtpci_methods[] = { /* Bus interface. */ DEVMETHOD(bus_driver_added, vtpci_driver_added), DEVMETHOD(bus_child_detached, vtpci_child_detached), + DEVMETHOD(bus_child_pnpinfo_str, virtio_child_pnpinfo_str), DEVMETHOD(bus_read_ivar, vtpci_read_ivar), DEVMETHOD(bus_write_ivar, vtpci_write_ivar), Modified: head/sys/dev/virtio/virtio.c ============================================================================== --- head/sys/dev/virtio/virtio.c Tue Jun 4 01:00:30 2019 (r348597) +++ head/sys/dev/virtio/virtio.c Tue Jun 4 02:34:59 2019 (r348598) @@ -263,6 +263,30 @@ virtio_write_device_config(device_t dev, bus_size_t of offset, dst, len); } +int +virtio_child_pnpinfo_str(device_t busdev __unused, device_t child, char *buf, + size_t buflen) +{ + + /* + * All of these PCI fields will be only 16 bits, but on the vtmmio bus + * the corresponding fields (only "vendor" and "device_type") are 32 + * bits. Many virtio drivers can attach below either bus. + * Gratuitously expand these two fields to 32-bits to allow sharing PNP + * match table data between the mostly-similar buses. + * + * Subdevice and device_type are redundant in both buses, so I don't + * see a lot of PNP utility in exposing the same value under a + * different name. + */ + snprintf(buf, buflen, "vendor=0x%08x device=0x%04x subvendor=0x%04x " + "device_type=0x%08x", (unsigned)virtio_get_vendor(child), + (unsigned)virtio_get_device(child), + (unsigned)virtio_get_subvendor(child), + (unsigned)virtio_get_device_type(child)); + return (0); +} + static int virtio_modevent(module_t mod, int type, void *unused) { Modified: head/sys/dev/virtio/virtio.h ============================================================================== --- head/sys/dev/virtio/virtio.h Tue Jun 4 01:00:30 2019 (r348597) +++ head/sys/dev/virtio/virtio.h Tue Jun 4 02:34:59 2019 (r348598) @@ -81,6 +81,8 @@ void virtio_stop(device_t dev); int virtio_config_generation(device_t dev); int virtio_reinit(device_t dev, uint64_t features); void virtio_reinit_complete(device_t dev); +int virtio_child_pnpinfo_str(device_t busdev, device_t child, char *buf, + size_t buflen); /* * Read/write a variable amount from the device specific (ie, network) _______________________________________________ svn-src-all@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
