/* * CXL ACPI Implementation * * Copyright(C) 2020 Intel Corporation. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, see */ #include "qemu/osdep.h" #include "hw/sysbus.h" #include "hw/pci/pci_bridge.h" #include "hw/pci/pci_host.h" #include "hw/cxl/cxl.h" #include "hw/mem/memory-device.h" #include "hw/acpi/acpi.h" #include "hw/acpi/aml-build.h" #include "hw/acpi/bios-linker-loader.h" #include "hw/acpi/cxl.h" #include "qapi/error.h" #include "qemu/uuid.h" static void cedt_build_chbs(GArray *table_data, PXBDev *cxl) { SysBusDevice *sbd = SYS_BUS_DEVICE(cxl->cxl.cxl_host_bridge); struct MemoryRegion *mr = sbd->mmio[0].memory; /* Type */ build_append_int_noprefix(table_data, 0, 1); /* Reserved */ build_append_int_noprefix(table_data, 0, 1); /* Record Length */ build_append_int_noprefix(table_data, 32, 2); /* UID - currently equal to bus number */ build_append_int_noprefix(table_data, cxl->bus_nr, 4); /* Version */ build_append_int_noprefix(table_data, 1, 4); /* Reserved */ build_append_int_noprefix(table_data, 0, 4); /* Base - subregion within a container that is in PA space */ build_append_int_noprefix(table_data, mr->container->addr + mr->addr, 8); /* Length */ build_append_int_noprefix(table_data, memory_region_size(mr), 8); } /* * CFMWS entries in CXL 2.0 ECN: CEDT CFMWS & QTG _DSM. * Interleave ways encoding in CXL 2.0 ECN: 3, 6, 12 and 16-way memory * interleaving. */ static void cedt_build_cfmws(GArray *table_data, CXLState *cxls) { GList *it; for (it = cxls->fixed_windows; it; it = it->next) { CXLFixedWindow *fw = it->data; int i; /* Type */ build_append_int_noprefix(table_data, 1, 1); /* Reserved */ build_append_int_noprefix(table_data, 0, 1); /* Record Length */ build_append_int_noprefix(table_data, 36 + 4 * fw->num_targets, 2); /* Reserved */ build_append_int_noprefix(table_data, 0, 4); /* Base HPA */ build_append_int_noprefix(table_data, fw->mr.addr, 8); /* Window Size */ build_append_int_noprefix(table_data, fw->size, 8); /* Host Bridge Interleave Ways */ build_append_int_noprefix(table_data, fw->enc_int_ways, 1); /* Host Bridge Interleave Arithmetic */ build_append_int_noprefix(table_data, 0, 1); /* Reserved */ build_append_int_noprefix(table_data, 0, 2); /* Host Bridge Interleave Granularity */ build_append_int_noprefix(table_data, fw->enc_int_gran, 4); /* Window Restrictions */ build_append_int_noprefix(table_data, 0x0f, 2); /* No restrictions */ /* QTG ID */ build_append_int_noprefix(table_data, 0, 2); /* Host Bridge List (list of UIDs - currently bus_nr) */ for (i = 0; i < fw->num_targets; i++) { g_assert(fw->target_hbs[i]); build_append_int_noprefix(table_data, fw->target_hbs[i]->bus_nr, 4); } } } static int cxl_foreach_pxb_hb(Object *obj, void *opaque) { Aml *cedt = opaque; if (object_dynamic_cast(obj, TYPE_PXB_CXL_DEVICE)) { cedt_build_chbs(cedt->buf, PXB_CXL_DEV(obj)); } return 0; } void cxl_build_cedt(GArray *table_offsets, GArray *table_data, BIOSLinker *linker, const char *oem_id, const char *oem_table_id, CXLState *cxl_state) { Aml *cedt; AcpiTable table = { .sig = "CEDT", .rev = 1, .oem_id = oem_id, .oem_table_id = oem_table_id }; acpi_add_table(table_offsets, table_data); acpi_table_begin(&table, table_data); cedt = init_aml_allocator(); /* reserve space for CEDT header */ object_child_foreach_recursive(object_get_root(), cxl_foreach_pxb_hb, cedt); cedt_build_cfmws(cedt->buf, cxl_state); /* copy AML table into ACPI tables blob and patch header there */ g_array_append_vals(table_data, cedt->buf->data, cedt->buf->len); free_aml_allocator(); acpi_table_end(linker, &table); } static Aml *__build_cxl_osc_method(void) { Aml *method, *if_uuid, *else_uuid, *if_arg1_not_1, *if_cxl, *if_caps_masked; Aml *a_ctrl = aml_local(0); Aml *a_cdw1 = aml_name("CDW1"); method = aml_method("_OSC", 4, AML_NOTSERIALIZED); /* CDW1 is used for the return value so is present whether or not a match occurs */ aml_append(method, aml_create_dword_field(aml_arg(3), aml_int(0), "CDW1")); /* * Generate shared section between: * CXL 2.0 - 9.14.2.1.4 and * PCI Firmware Specification 3.0 * 4.5.1. _OSC Interface for PCI Host Bridge Devices * The _OSC interface for a PCI/PCI-X/PCI Express hierarchy is * identified by the Universal Unique IDentifier (UUID) * 33DB4D5B-1FF7-401C-9657-7441C03DD766 * The _OSC interface for a CXL Host bridge is * identified by the UUID 68F2D50B-C469-4D8A-BD3D-941A103FD3FC * A CXL Host bridge is compatible with a PCI host bridge so * for the shared section match both. */ if_uuid = aml_if( aml_lor(aml_equal(aml_arg(0), aml_touuid("33DB4D5B-1FF7-401C-9657-7441C03DD766")), aml_equal(aml_arg(0), aml_touuid("68F2D50B-C469-4D8A-BD3D-941A103FD3FC")))); aml_append(if_uuid, aml_create_dword_field(aml_arg(3), aml_int(4), "CDW2")); aml_append(if_uuid, aml_create_dword_field(aml_arg(3), aml_int(8), "CDW3")); aml_append(if_uuid, aml_store(aml_name("CDW3"), a_ctrl)); /* * * Allows OS control for all 5 features: * PCIeHotplug SHPCHotplug PME AER PCIeCapability */ aml_append(if_uuid, aml_and(a_ctrl, aml_int(0x1F), a_ctrl)); /* * Check _OSC revision. * PCI Firmware specification 3.3 and CXL 2.0 both use revision 1 * Unknown Revision is CDW1 - BIT (3) */ if_arg1_not_1 = aml_if(aml_lnot(aml_equal(aml_arg(1), aml_int(0x1)))); aml_append(if_arg1_not_1, aml_or(a_cdw1, aml_int(0x08), a_cdw1)); aml_append(if_uuid, if_arg1_not_1); if_caps_masked = aml_if(aml_lnot(aml_equal(aml_name("CDW3"), a_ctrl))); /* Capability bits were masked */ aml_append(if_caps_masked, aml_or(a_cdw1, aml_int(0x10), a_cdw1)); aml_append(if_uuid, if_caps_masked); aml_append(if_uuid, aml_store(aml_name("CDW2"), aml_name("SUPP"))); aml_append(if_uuid, aml_store(aml_name("CDW3"), aml_name("CTRL"))); /* Update DWORD3 (the return value) */ aml_append(if_uuid, aml_store(a_ctrl, aml_name("CDW3"))); /* CXL only section as per CXL 2.0 - 9.14.2.1.4 */ if_cxl = aml_if(aml_equal( aml_arg(0), aml_touuid("68F2D50B-C469-4D8A-BD3D-941A103FD3FC"))); /* CXL support field */ aml_append(if_cxl, aml_create_dword_field(aml_arg(3), aml_int(12), "CDW4")); /* CXL capabilities */ aml_append(if_cxl, aml_create_dword_field(aml_arg(3), aml_int(16), "CDW5")); aml_append(if_cxl, aml_store(aml_name("CDW4"), aml_name("SUPC"))); aml_append(if_cxl, aml_store(aml_name("CDW5"), aml_name("CTRC"))); /* CXL 2.0 Port/Device Register access */ aml_append(if_cxl, aml_or(aml_name("CDW5"), aml_int(0x1), aml_name("CDW5"))); aml_append(if_uuid, if_cxl); aml_append(if_uuid, aml_return(aml_arg(3))); aml_append(method, if_uuid); /* * If no UUID matched, return Unrecognized UUID via Arg3 DWord 1 * ACPI 6.4 - 6.2.11 * Unrecognised UUID - BIT(2) */ else_uuid = aml_else(); aml_append(else_uuid, aml_or(aml_name("CDW1"), aml_int(0x4), aml_name("CDW1"))); aml_append(else_uuid, aml_return(aml_arg(3))); aml_append(method, else_uuid); return method; } void build_cxl_osc_method(Aml *dev) { aml_append(dev, aml_name_decl("SUPP", aml_int(0))); aml_append(dev, aml_name_decl("CTRL", aml_int(0))); aml_append(dev, aml_name_decl("SUPC", aml_int(0))); aml_append(dev, aml_name_decl("CTRC", aml_int(0))); aml_append(dev, __build_cxl_osc_method()); }