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qemu/hw/acpi/cxl.c
Jonathan Cameron c28db9e000 hw/pci-bridge: Make PCIe and CXL PXB Devices inherit from TYPE_PXB_DEV 
Previously, PXB_CXL_DEVICE, PXB_PCIE_DEVICE and PXB_DEVICE all
have PCI_DEVICE as their direct parent but share a common state
struct PXBDev. convert_to_pxb() is used to get the PXBDev
instance from which ever of these types it is called on.

This patch switches to an explicit hierarchy based on shared
functionality.  To allow use of OBJECT_DECLARE_SIMPLE_TYPE()
whilst minimizing code changes, all types are renamed to have
the postfix _DEV rather than _DEVICE.  The new heirarchy
has PXB_CXL_DEV with parent PXB_PCIE_DEV which in turn
has parent PXB_DEV which continues to have parent PCI_DEVICE.

This allows simple use of PXB_DEV() etc rather than a custom function
+ removal of duplicated properties and moving the CXL specific
elements out of struct PXBDev.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Message-Id: <20230420142750.6950-3-Jonathan.Cameron@huawei.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2023-04-24 22:56:55 -04:00

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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/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, 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(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, 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)
{
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());
}
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