| 1 | /* |
| 2 | * QEMU ACPI PCI bridge |
| 3 | * |
| 4 | * Copyright (c) 2023 Red Hat, Inc. |
| 5 | * |
| 6 | * Author: |
| 7 | * Igor Mammedov <imammedo@redhat.com> |
| 8 | * |
| 9 | * SPDX-License-Identifier: GPL-2.0-or-later |
| 10 | * |
| 11 | * This work is licensed under the terms of the GNU GPL, version 2 or later. |
| 12 | * See the COPYING file in the top-level directory. |
| 13 | */ |
| 14 | |
| 15 | #include "qemu/osdep.h" |
| 16 | #include "hw/acpi/pci.h" |
| 17 | #include "hw/pci/pci_bridge.h" |
| 18 | #include "hw/acpi/pcihp.h" |
| 19 | |
| 20 | void build_pci_bridge_aml(AcpiDevAmlIf *adev, Aml *scope) |
| 21 | { |
| 22 | PCIBridge *br = PCI_BRIDGE(adev); |
| 23 | |
| 24 | if (!DEVICE(br)->hotplugged) { |
| 25 | PCIBus *sec_bus = pci_bridge_get_sec_bus(br); |
| 26 | Error *local_err = NULL; |
| 27 | uint32_t bsel; |
| 28 | |
| 29 | build_append_pci_bus_devices(scope, sec_bus); |
| 30 | |
| 31 | /* |
| 32 | * generate hotplug slots descriptors if |
| 33 | * bridge has ACPI PCI hotplug attached, |
| 34 | */ |
| 35 | bsel = object_property_get_uint(OBJECT(sec_bus), ACPI_PCIHP_PROP_BSEL, |
| 36 | &local_err); |
| 37 | |
| 38 | if (local_err == NULL && bsel != UINT32_MAX) { |
| 39 | build_append_pcihp_slots(scope, sec_bus); |
| 40 | } |
| 41 | |
| 42 | error_free(local_err); |
| 43 | } |
| 44 | } |
| 45 | |
| 46 | Aml *build_pci_bridge_edsm(void) |
| 47 | { |
| 48 | Aml *method, *ifctx; |
| 49 | Aml *zero = aml_int(0); |
| 50 | Aml *func = aml_arg(2); |
| 51 | Aml *ret = aml_local(0); |
| 52 | Aml *aidx = aml_local(1); |
| 53 | Aml *params = aml_arg(4); |
| 54 | |
| 55 | method = aml_method("EDSM", 5, AML_SERIALIZED); |
| 56 | |
| 57 | /* get supported functions */ |
| 58 | ifctx = aml_if(aml_equal(func, zero)); |
| 59 | { |
| 60 | /* 1: have supported functions */ |
| 61 | /* 7: support for function 7 */ |
| 62 | const uint8_t caps = 1 | BIT(7); |
| 63 | build_append_pci_dsm_func0_common(ifctx, ret); |
| 64 | aml_append(ifctx, aml_store(aml_int(caps), aml_index(ret, zero))); |
| 65 | aml_append(ifctx, aml_return(ret)); |
| 66 | } |
| 67 | aml_append(method, ifctx); |
| 68 | |
| 69 | /* handle specific functions requests */ |
| 70 | /* |
| 71 | * PCI Firmware Specification 3.1 |
| 72 | * 4.6.7. _DSM for Naming a PCI or PCI Express Device Under |
| 73 | * Operating Systems |
| 74 | */ |
| 75 | ifctx = aml_if(aml_equal(func, aml_int(7))); |
| 76 | { |
| 77 | Aml *pkg = aml_package(2); |
| 78 | aml_append(pkg, zero); |
| 79 | /* optional, if not impl. should return null string */ |
| 80 | aml_append(pkg, aml_string("%s", "")); |
| 81 | aml_append(ifctx, aml_store(pkg, ret)); |
| 82 | |
| 83 | /* |
| 84 | * IASL is fine when initializing Package with computational data, |
| 85 | * however it makes guest unhappy /it fails to process such AML/. |
| 86 | * So use runtime assignment to set acpi-index after initializer |
| 87 | * to make OSPM happy. |
| 88 | */ |
| 89 | aml_append(ifctx, |
| 90 | aml_store(aml_derefof(aml_index(params, aml_int(0))), aidx)); |
| 91 | aml_append(ifctx, aml_store(aidx, aml_index(ret, zero))); |
| 92 | aml_append(ifctx, aml_return(ret)); |
| 93 | } |
| 94 | aml_append(method, ifctx); |
| 95 | |
| 96 | return method; |
| 97 | } |
| 98 |