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hw/cxl: Add a switch mailbox CCI function

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CXL switch CCIs were added in CXL r3.0. They are a PCI function,
identified by class code that provides a CXL mailbox (identical
to that previously defined for CXL type 3 memory devices) over which
various FM-API commands may be used. Whilst the intent of this
feature is enable switch control from a BMC attached to a switch
upstream port, it is also useful to allow emulation of this feature
on the upstream port connected to a host using the CXL devices as
this greatly simplifies testing.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Message-Id: <20231023160806.13206-7-Jonathan.Cameron@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Jonathan Cameron 2023-10-23 17:07:55 +01:00 • committed by Michael S. Tsirkin
parent 2710d49a7c
commit 4a58330343
7 changed files with 175 additions and 1 deletions
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111
hw/cxl/switch-mailbox-cci.c Normal file
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/*
* SPDX-License-Identifier: GPL-2.0-or-later
*
* Emulation of a CXL Switch Mailbox CCI PCIe function.
*
* Copyright (c) 2023 Huawei Technologies.
*
* From www.computeexpresslink.org
* Compute Express Link (CXL) Specification revision 3.0 Version 1.0
*/
#include "qemu/osdep.h"
#include "hw/pci/pci.h"
#include "hw/pci-bridge/cxl_upstream_port.h"
#include "qapi/error.h"
#include "qemu/log.h"
#include "qemu/module.h"
#include "hw/qdev-properties.h"
#include "hw/cxl/cxl.h"
static void cswmbcci_reset(DeviceState *dev)
{
CSWMBCCIDev *cswmb = CXL_SWITCH_MAILBOX_CCI(dev);
cxl_device_register_init_swcci(cswmb);
}
static void cswbcci_realize(PCIDevice *pci_dev, Error **errp)
{
CSWMBCCIDev *cswmb = CXL_SWITCH_MAILBOX_CCI(pci_dev);
CXLComponentState *cxl_cstate = &cswmb->cxl_cstate;
CXLDeviceState *cxl_dstate = &cswmb->cxl_dstate;
CXLDVSECRegisterLocator *regloc_dvsec;
CXLUpstreamPort *usp;
if (!cswmb->target) {
error_setg(errp, "Target not set");
return;
}
usp = CXL_USP(cswmb->target);
pcie_endpoint_cap_init(pci_dev, 0x80);
cxl_cstate->dvsec_offset = 0x100;
cxl_cstate->pdev = pci_dev;
cswmb->cci = &usp->swcci;
cxl_device_register_block_init(OBJECT(pci_dev), cxl_dstate, cswmb->cci);
pci_register_bar(pci_dev, 0,
PCI_BASE_ADDRESS_SPACE_MEMORY |
PCI_BASE_ADDRESS_MEM_TYPE_64,
&cxl_dstate->device_registers);
regloc_dvsec = &(CXLDVSECRegisterLocator) {
.rsvd = 0,
.reg0_base_lo = RBI_CXL_DEVICE_REG | 0,
.reg0_base_hi = 0,
};
cxl_component_create_dvsec(cxl_cstate, CXL3_SWITCH_MAILBOX_CCI,
REG_LOC_DVSEC_LENGTH, REG_LOC_DVSEC,
REG_LOC_DVSEC_REVID, (uint8_t *)regloc_dvsec);
cxl_initialize_mailbox_swcci(cswmb->cci, DEVICE(pci_dev),
DEVICE(cswmb->target),
CXL_MAILBOX_MAX_PAYLOAD_SIZE);
}
static void cswmbcci_exit(PCIDevice *pci_dev)
{
/* Nothing to do here yet */
}
static Property cxl_switch_cci_props[] = {
DEFINE_PROP_LINK("target", CSWMBCCIDev,
target, TYPE_CXL_USP, PCIDevice *),
DEFINE_PROP_END_OF_LIST(),
};
static void cswmbcci_class_init(ObjectClass *oc, void *data)
{
DeviceClass *dc = DEVICE_CLASS(oc);
PCIDeviceClass *pc = PCI_DEVICE_CLASS(oc);
pc->realize = cswbcci_realize;
pc->exit = cswmbcci_exit;
/* Serial bus, CXL Switch CCI */
pc->class_id = 0x0c0b;
/*
* Huawei Technologies
* CXL Switch Mailbox CCI - DID assigned for emulation only.
* No real hardware will ever use this ID.
*/
pc->vendor_id = 0x19e5;
pc->device_id = 0xa123;
pc->revision = 0;
dc->desc = "CXL Switch Mailbox CCI";
dc->reset = cswmbcci_reset;
device_class_set_props(dc, cxl_switch_cci_props);
}
static const TypeInfo cswmbcci_info = {
.name = TYPE_CXL_SWITCH_MAILBOX_CCI,
.parent = TYPE_PCI_DEVICE,
.class_init = cswmbcci_class_init,
.instance_size = sizeof(CSWMBCCIDev),
.interfaces = (InterfaceInfo[]) {
{ INTERFACE_PCIE_DEVICE },
{ }
},
};
static void cxl_switch_mailbox_cci_register(void)
{
type_register_static(&cswmbcci_info);
}
type_init(cxl_switch_mailbox_cci_register);