Author: jhb Date: Wed Apr 20 20:58:30 2016 New Revision: 298372 URL: https://svnweb.freebsd.org/changeset/base/298372
Log: Invoke _OSC on Host-PCI bridges. Tell the firmware that we support PCI-express config space access and MSI. Reviewed by: jkim MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D6023 Modified: head/sys/dev/acpica/acpi_pcib_acpi.c Modified: head/sys/dev/acpica/acpi_pcib_acpi.c ============================================================================== --- head/sys/dev/acpica/acpi_pcib_acpi.c Wed Apr 20 20:56:06 2016 (r298371) +++ head/sys/dev/acpica/acpi_pcib_acpi.c Wed Apr 20 20:58:30 2016 (r298372) @@ -295,6 +295,40 @@ first_decoded_bus(struct acpi_hpcib_soft } #endif +static void +acpi_pcib_osc(struct acpi_hpcib_softc *sc) +{ + ACPI_STATUS status; + uint32_t cap_set[3]; + + static uint8_t pci_host_bridge_uuid[ACPI_UUID_LENGTH] = { + 0x5b, 0x4d, 0xdb, 0x33, 0xf7, 0x1f, 0x1c, 0x40, + 0x96, 0x57, 0x74, 0x41, 0xc0, 0x3d, 0xd7, 0x66 + }; + + /* Support Field: Extended PCI Config Space, MSI */ + cap_set[1] = 0x11; + + /* Control Field */ + cap_set[2] = 0; + + status = acpi_EvaluateOSC(sc->ap_handle, pci_host_bridge_uuid, 1, + nitems(cap_set), cap_set, false); + if (ACPI_FAILURE(status)) { + if (status == AE_NOT_FOUND) + return; + device_printf(sc->ap_dev, "_OSC failed: %s\n", + AcpiFormatException(status)); + return; + } + + if (cap_set[0] != 0) { + device_printf(sc->ap_dev, "_OSC returned error %#x\n", + cap_set[0]); + return; + } +} + static int acpi_pcib_acpi_attach(device_t dev) { @@ -321,6 +355,8 @@ acpi_pcib_acpi_attach(device_t dev) if (!acpi_DeviceIsPresent(dev)) return (ENXIO); + acpi_pcib_osc(sc); + /* * Get our segment number by evaluating _SEG. * It's OK for this to not exist. _______________________________________________ [email protected] mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "[email protected]"
