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
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c1eac826c2
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508c21b669
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=298372
@ -295,6 +295,40 @@ first_decoded_bus(struct acpi_hpcib_softc *sc, rman_res_t *startp)
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}
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#endif
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static void
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acpi_pcib_osc(struct acpi_hpcib_softc *sc)
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{
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ACPI_STATUS status;
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uint32_t cap_set[3];
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static uint8_t pci_host_bridge_uuid[ACPI_UUID_LENGTH] = {
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0x5b, 0x4d, 0xdb, 0x33, 0xf7, 0x1f, 0x1c, 0x40,
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0x96, 0x57, 0x74, 0x41, 0xc0, 0x3d, 0xd7, 0x66
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};
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/* Support Field: Extended PCI Config Space, MSI */
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cap_set[1] = 0x11;
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/* Control Field */
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cap_set[2] = 0;
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status = acpi_EvaluateOSC(sc->ap_handle, pci_host_bridge_uuid, 1,
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nitems(cap_set), cap_set, false);
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if (ACPI_FAILURE(status)) {
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if (status == AE_NOT_FOUND)
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return;
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device_printf(sc->ap_dev, "_OSC failed: %s\n",
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AcpiFormatException(status));
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return;
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}
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if (cap_set[0] != 0) {
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device_printf(sc->ap_dev, "_OSC returned error %#x\n",
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cap_set[0]);
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return;
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}
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}
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static int
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acpi_pcib_acpi_attach(device_t dev)
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{
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@ -321,6 +355,8 @@ acpi_pcib_acpi_attach(device_t dev)
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if (!acpi_DeviceIsPresent(dev))
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return (ENXIO);
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acpi_pcib_osc(sc);
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/*
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* Get our segment number by evaluating _SEG.
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* It's OK for this to not exist.
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