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qemu-cr16/hw/acpi/cxl.c
Jonathan Cameron 584f722eb3 hw/cxl: Make the CXL fixed memory windows devices. 
Previously these somewhat device like structures were tracked using a list
in the CXLState in each machine. This is proving restrictive in a few
cases where we need to iterate through these without being aware of the
machine type. Just make them sysbus devices.

Restrict them to not user created as they need to be visible to early
stages of machine init given effects on the memory map.

This change both simplifies state tracking and enables features needed
for performance optimization and hotness tracking by making it possible
to retrieve the fixed memory window on actions elsewhere in the topology.

In some cases the ordering of the Fixed Memory Windows matters.
For those utility functions provide a GSList sorted by the window index.
This ensures that we get consistency across:
- ordering in the command line
- ordering of the host PA ranges
- ordering of ACPI CEDT structures describing the CFMWS.

Other aspects don't have this constraint. For those direct iteration
of the underlying hash structures is fine.

In the setup path for the memory map in pc_memory_init() split the
operations into two calls. The first, cxl_fmws_set_mmemap(), loops over
fixed memory windows in order and assigns their addresses.  The second,
cxl_fmws_update_mmio() actually sets up the mmio for each window.
This is obviously less efficient than a single loop but this split design
is needed to put the logic in two different places in the arm64 support
and it is not a hot enough path to justify an x86 only implementation.

Reviewed-by: Li Zhijian <lizhijian@fujitsu.com>
Tested-by: Li Zhijian <lizhijian@fujitsu.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Tested-by: Itaru Kitayama <itaru.kitayama@fujitsu.com>
Message-id: 20250703104110.992379-3-Jonathan.Cameron@huawei.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2025-07-08 20:27:09 +01:00

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/*
* 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 <http://www.gnu.org/licenses/>
*/
#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/cxl/cxl_host.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"
void build_cxl_dsm_method(Aml *dev)
{
Aml *method, *ifctx, *ifctx2;
method = aml_method("_DSM", 4, AML_SERIALIZED);
{
Aml *function, *uuid;
uuid = aml_arg(0);
function = aml_arg(2);
/* CXL spec v3.0 9.17.3.1 _DSM Function for Retrieving QTG ID */
ifctx = aml_if(aml_equal(
uuid, aml_touuid("F365F9A6-A7DE-4071-A66A-B40C0B4F8E52")));
/* Function 0, standard DSM query function */
ifctx2 = aml_if(aml_equal(function, aml_int(0)));
{
uint8_t byte_list[1] = { 0x01 }; /* function 1 only */
aml_append(ifctx2,
aml_return(aml_buffer(sizeof(byte_list), byte_list)));
}
aml_append(ifctx, ifctx2);
/*
* Function 1
* Creating a package with static values. The max supported QTG ID will
* be 1 and recommended QTG IDs are 0 and then 1.
* The values here are statically created to simplify emulation. Values
* from a real BIOS would be determined by the performance of all the
* present CXL memory and then assigned.
*/
ifctx2 = aml_if(aml_equal(function, aml_int(1)));
{
Aml *pak, *pak1;
/*
* Return: A package containing two elements - a WORD that returns
* the maximum throttling group that the platform supports, and a
* package containing the QTG ID(s) that the platform recommends.
* Package {
* Max Supported QTG ID
* Package {QTG Recommendations}
* }
*
* While the SPEC specified WORD that hints at the value being
* 16bit, the ACPI dump of BIOS DSDT table showed that the values
* are integers with no specific size specification. aml_int() will
* be used for the values.
*/
pak1 = aml_package(2);
/* Set QTG ID of 0 */
aml_append(pak1, aml_int(0));
/* Set QTG ID of 1 */
aml_append(pak1, aml_int(1));
pak = aml_package(2);
/* Set Max QTG 1 */
aml_append(pak, aml_int(1));
aml_append(pak, pak1);
aml_append(ifctx2, aml_return(pak));
}
aml_append(ifctx, ifctx2);
}
aml_append(method, ifctx);
aml_append(dev, method);
}
static void cedt_build_chbs(GArray *table_data, PXBCXLDev *cxl)
{
PXBDev *pxb = PXB_DEV(cxl);
SysBusDevice *sbd = SYS_BUS_DEVICE(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, pxb->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(CXLFixedWindow *fw, Aml *cedt)
{
GArray *table_data = cedt->buf;
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);
/* 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,
PXB_DEV(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_DEV)) {
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)
{
GSList *cfmws_list, *iter;
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);
cfmws_list = cxl_fmws_get_all_sorted();
for (iter = cfmws_list; iter; iter = iter->next) {
cedt_build_cfmws(CXL_FMW(iter->data), cedt);
}
g_slist_free(cfmws_list);
/* 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());
}
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