blob: 9df436cb73adfdad14742ca2f43d6de799d126ac [file] [log] [blame]
/*
* Emulated CXL Switch Upstream Port
*
* Copyright (c) 2022 Huawei Technologies.
*
* Based on xio3130_upstream.c
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "qemu/osdep.h"
#include "qemu/log.h"
#include "hw/qdev-properties.h"
#include "hw/pci/msi.h"
#include "hw/pci/pcie.h"
#include "hw/pci/pcie_port.h"
#define CXL_UPSTREAM_PORT_MSI_NR_VECTOR 2
#define CXL_UPSTREAM_PORT_MSI_OFFSET 0x70
#define CXL_UPSTREAM_PORT_PCIE_CAP_OFFSET 0x90
#define CXL_UPSTREAM_PORT_AER_OFFSET 0x100
#define CXL_UPSTREAM_PORT_DVSEC_OFFSET \
(CXL_UPSTREAM_PORT_AER_OFFSET + PCI_ERR_SIZEOF)
typedef struct CXLUpstreamPort {
/*< private >*/
PCIEPort parent_obj;
/*< public >*/
CXLComponentState cxl_cstate;
DOECap doe_cdat;
} CXLUpstreamPort;
CXLComponentState *cxl_usp_to_cstate(CXLUpstreamPort *usp)
{
return &usp->cxl_cstate;
}
static void cxl_usp_dvsec_write_config(PCIDevice *dev, uint32_t addr,
uint32_t val, int len)
{
CXLUpstreamPort *usp = CXL_USP(dev);
if (range_contains(&usp->cxl_cstate.dvsecs[EXTENSIONS_PORT_DVSEC], addr)) {
uint8_t *reg = &dev->config[addr];
addr -= usp->cxl_cstate.dvsecs[EXTENSIONS_PORT_DVSEC].lob;
if (addr == PORT_CONTROL_OFFSET) {
if (pci_get_word(reg) & PORT_CONTROL_UNMASK_SBR) {
/* unmask SBR */
qemu_log_mask(LOG_UNIMP, "SBR mask control is not supported\n");
}
if (pci_get_word(reg) & PORT_CONTROL_ALT_MEMID_EN) {
/* Alt Memory & ID Space Enable */
qemu_log_mask(LOG_UNIMP,
"Alt Memory & ID space is not supported\n");
}
}
}
}
static void cxl_usp_write_config(PCIDevice *d, uint32_t address,
uint32_t val, int len)
{
CXLUpstreamPort *usp = CXL_USP(d);
pcie_doe_write_config(&usp->doe_cdat, address, val, len);
pci_bridge_write_config(d, address, val, len);
pcie_cap_flr_write_config(d, address, val, len);
pcie_aer_write_config(d, address, val, len);
cxl_usp_dvsec_write_config(d, address, val, len);
}
static uint32_t cxl_usp_read_config(PCIDevice *d, uint32_t address, int len)
{
CXLUpstreamPort *usp = CXL_USP(d);
uint32_t val;
if (pcie_doe_read_config(&usp->doe_cdat, address, len, &val)) {
return val;
}
return pci_default_read_config(d, address, len);
}
static void latch_registers(CXLUpstreamPort *usp)
{
uint32_t *reg_state = usp->cxl_cstate.crb.cache_mem_registers;
uint32_t *write_msk = usp->cxl_cstate.crb.cache_mem_regs_write_mask;
cxl_component_register_init_common(reg_state, write_msk,
CXL2_UPSTREAM_PORT);
ARRAY_FIELD_DP32(reg_state, CXL_HDM_DECODER_CAPABILITY, TARGET_COUNT, 8);
}
static void cxl_usp_reset(DeviceState *qdev)
{
PCIDevice *d = PCI_DEVICE(qdev);
CXLUpstreamPort *usp = CXL_USP(qdev);
pci_bridge_reset(qdev);
pcie_cap_deverr_reset(d);
latch_registers(usp);
}
static void build_dvsecs(CXLComponentState *cxl)
{
uint8_t *dvsec;
dvsec = (uint8_t *)&(CXLDVSECPortExtensions){
.status = 0x1, /* Port Power Management Init Complete */
};
cxl_component_create_dvsec(cxl, CXL2_UPSTREAM_PORT,
EXTENSIONS_PORT_DVSEC_LENGTH,
EXTENSIONS_PORT_DVSEC,
EXTENSIONS_PORT_DVSEC_REVID, dvsec);
dvsec = (uint8_t *)&(CXLDVSECPortFlexBus){
.cap = 0x27, /* Cache, IO, Mem, non-MLD */
.ctrl = 0x27, /* Cache, IO, Mem */
.status = 0x26, /* same */
.rcvd_mod_ts_data_phase1 = 0xef, /* WTF? */
};
cxl_component_create_dvsec(cxl, CXL2_UPSTREAM_PORT,
PCIE_FLEXBUS_PORT_DVSEC_LENGTH_2_0,
PCIE_FLEXBUS_PORT_DVSEC,
PCIE_FLEXBUS_PORT_DVSEC_REVID_2_0, dvsec);
dvsec = (uint8_t *)&(CXLDVSECRegisterLocator){
.rsvd = 0,
.reg0_base_lo = RBI_COMPONENT_REG | CXL_COMPONENT_REG_BAR_IDX,
.reg0_base_hi = 0,
};
cxl_component_create_dvsec(cxl, CXL2_UPSTREAM_PORT,
REG_LOC_DVSEC_LENGTH, REG_LOC_DVSEC,
REG_LOC_DVSEC_REVID, dvsec);
}
static bool cxl_doe_cdat_rsp(DOECap *doe_cap)
{
CDATObject *cdat = &CXL_USP(doe_cap->pdev)->cxl_cstate.cdat;
uint16_t ent;
void *base;
uint32_t len;
CDATReq *req = pcie_doe_get_write_mbox_ptr(doe_cap);
CDATRsp rsp;
cxl_doe_cdat_update(&CXL_USP(doe_cap->pdev)->cxl_cstate, &error_fatal);
assert(cdat->entry_len);
/* Discard if request length mismatched */
if (pcie_doe_get_obj_len(req) <
DIV_ROUND_UP(sizeof(CDATReq), sizeof(uint32_t))) {
return false;
}
ent = req->entry_handle;
base = cdat->entry[ent].base;
len = cdat->entry[ent].length;
rsp = (CDATRsp) {
.header = {
.vendor_id = CXL_VENDOR_ID,
.data_obj_type = CXL_DOE_TABLE_ACCESS,
.reserved = 0x0,
.length = DIV_ROUND_UP((sizeof(rsp) + len), sizeof(uint32_t)),
},
.rsp_code = CXL_DOE_TAB_RSP,
.table_type = CXL_DOE_TAB_TYPE_CDAT,
.entry_handle = (ent < cdat->entry_len - 1) ?
ent + 1 : CXL_DOE_TAB_ENT_MAX,
};
memcpy(doe_cap->read_mbox, &rsp, sizeof(rsp));
memcpy(doe_cap->read_mbox + DIV_ROUND_UP(sizeof(rsp), sizeof(uint32_t)),
base, len);
doe_cap->read_mbox_len += rsp.header.length;
return true;
}
static DOEProtocol doe_cdat_prot[] = {
{ CXL_VENDOR_ID, CXL_DOE_TABLE_ACCESS, cxl_doe_cdat_rsp },
{ }
};
enum {
CXL_USP_CDAT_SSLBIS_LAT,
CXL_USP_CDAT_SSLBIS_BW,
CXL_USP_CDAT_NUM_ENTRIES
};
static int build_cdat_table(CDATSubHeader ***cdat_table, void *priv)
{
g_autofree CDATSslbis *sslbis_latency = NULL;
g_autofree CDATSslbis *sslbis_bandwidth = NULL;
CXLUpstreamPort *us = CXL_USP(priv);
PCIBus *bus = &PCI_BRIDGE(us)->sec_bus;
int devfn, sslbis_size, i;
int count = 0;
uint16_t port_ids[256];
for (devfn = 0; devfn < ARRAY_SIZE(bus->devices); devfn++) {
PCIDevice *d = bus->devices[devfn];
PCIEPort *port;
if (!d || !pci_is_express(d) || !d->exp.exp_cap) {
continue;
}
/*
* Whilst the PCI express spec doesn't allow anything other than
* downstream ports on this bus, let us be a little paranoid
*/
if (!object_dynamic_cast(OBJECT(d), TYPE_PCIE_PORT)) {
continue;
}
port = PCIE_PORT(d);
port_ids[count] = port->port;
count++;
}
/* May not yet have any ports - try again later */
if (count == 0) {
return 0;
}
sslbis_size = sizeof(CDATSslbis) + sizeof(*sslbis_latency->sslbe) * count;
sslbis_latency = g_malloc(sslbis_size);
if (!sslbis_latency) {
return -ENOMEM;
}
*sslbis_latency = (CDATSslbis) {
.sslbis_header = {
.header = {
.type = CDAT_TYPE_SSLBIS,
.length = sslbis_size,
},
.data_type = HMATLB_DATA_TYPE_ACCESS_LATENCY,
.entry_base_unit = 10000,
},
};
for (i = 0; i < count; i++) {
sslbis_latency->sslbe[i] = (CDATSslbe) {
.port_x_id = CDAT_PORT_ID_USP,
.port_y_id = port_ids[i],
.latency_bandwidth = 15, /* 150ns */
};
}
sslbis_bandwidth = g_malloc(sslbis_size);
if (!sslbis_bandwidth) {
return 0;
}
*sslbis_bandwidth = (CDATSslbis) {
.sslbis_header = {
.header = {
.type = CDAT_TYPE_SSLBIS,
.length = sslbis_size,
},
.data_type = HMATLB_DATA_TYPE_ACCESS_BANDWIDTH,
.entry_base_unit = 1000,
},
};
for (i = 0; i < count; i++) {
sslbis_bandwidth->sslbe[i] = (CDATSslbe) {
.port_x_id = CDAT_PORT_ID_USP,
.port_y_id = port_ids[i],
.latency_bandwidth = 16, /* 16 GB/s */
};
}
*cdat_table = g_malloc0(sizeof(*cdat_table) * CXL_USP_CDAT_NUM_ENTRIES);
if (!*cdat_table) {
return -ENOMEM;
}
/* Header always at start of structure */
(*cdat_table)[CXL_USP_CDAT_SSLBIS_LAT] = g_steal_pointer(&sslbis_latency);
(*cdat_table)[CXL_USP_CDAT_SSLBIS_BW] = g_steal_pointer(&sslbis_bandwidth);
return CXL_USP_CDAT_NUM_ENTRIES;
}
static void free_default_cdat_table(CDATSubHeader **cdat_table, int num,
void *priv)
{
int i;
for (i = 0; i < num; i++) {
g_free(cdat_table[i]);
}
g_free(cdat_table);
}
static void cxl_usp_realize(PCIDevice *d, Error **errp)
{
PCIEPort *p = PCIE_PORT(d);
CXLUpstreamPort *usp = CXL_USP(d);
CXLComponentState *cxl_cstate = &usp->cxl_cstate;
ComponentRegisters *cregs = &cxl_cstate->crb;
MemoryRegion *component_bar = &cregs->component_registers;
int rc;
pci_bridge_initfn(d, TYPE_PCIE_BUS);
pcie_port_init_reg(d);
rc = msi_init(d, CXL_UPSTREAM_PORT_MSI_OFFSET,
CXL_UPSTREAM_PORT_MSI_NR_VECTOR, true, true, errp);
if (rc) {
assert(rc == -ENOTSUP);
goto err_bridge;
}
rc = pcie_cap_init(d, CXL_UPSTREAM_PORT_PCIE_CAP_OFFSET,
PCI_EXP_TYPE_UPSTREAM, p->port, errp);
if (rc < 0) {
goto err_msi;
}
pcie_cap_flr_init(d);
pcie_cap_deverr_init(d);
rc = pcie_aer_init(d, PCI_ERR_VER, CXL_UPSTREAM_PORT_AER_OFFSET,
PCI_ERR_SIZEOF, errp);
if (rc) {
goto err_cap;
}
cxl_cstate->dvsec_offset = CXL_UPSTREAM_PORT_DVSEC_OFFSET;
cxl_cstate->pdev = d;
build_dvsecs(cxl_cstate);
cxl_component_register_block_init(OBJECT(d), cxl_cstate, TYPE_CXL_USP);
pci_register_bar(d, CXL_COMPONENT_REG_BAR_IDX,
PCI_BASE_ADDRESS_SPACE_MEMORY |
PCI_BASE_ADDRESS_MEM_TYPE_64,
component_bar);
pcie_doe_init(d, &usp->doe_cdat, cxl_cstate->dvsec_offset, doe_cdat_prot,
true, 1);
cxl_cstate->cdat.build_cdat_table = build_cdat_table;
cxl_cstate->cdat.free_cdat_table = free_default_cdat_table;
cxl_cstate->cdat.private = d;
cxl_doe_cdat_init(cxl_cstate, errp);
return;
err_cap:
pcie_cap_exit(d);
err_msi:
msi_uninit(d);
err_bridge:
pci_bridge_exitfn(d);
}
static void cxl_usp_exitfn(PCIDevice *d)
{
pcie_aer_exit(d);
pcie_cap_exit(d);
msi_uninit(d);
pci_bridge_exitfn(d);
}
static Property cxl_upstream_props[] = {
DEFINE_PROP_STRING("cdat", CXLUpstreamPort, cxl_cstate.cdat.filename),
DEFINE_PROP_END_OF_LIST()
};
static void cxl_upstream_class_init(ObjectClass *oc, void *data)
{
DeviceClass *dc = DEVICE_CLASS(oc);
PCIDeviceClass *k = PCI_DEVICE_CLASS(oc);
k->config_write = cxl_usp_write_config;
k->config_read = cxl_usp_read_config;
k->realize = cxl_usp_realize;
k->exit = cxl_usp_exitfn;
k->vendor_id = 0x19e5; /* Huawei */
k->device_id = 0xa128; /* Emulated CXL Switch Upstream Port */
k->revision = 0;
set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
dc->desc = "CXL Switch Upstream Port";
dc->reset = cxl_usp_reset;
device_class_set_props(dc, cxl_upstream_props);
}
static const TypeInfo cxl_usp_info = {
.name = TYPE_CXL_USP,
.parent = TYPE_PCIE_PORT,
.instance_size = sizeof(CXLUpstreamPort),
.class_init = cxl_upstream_class_init,
.interfaces = (InterfaceInfo[]) {
{ INTERFACE_PCIE_DEVICE },
{ INTERFACE_CXL_DEVICE },
{ }
},
};
static void cxl_usp_register_type(void)
{
type_register_static(&cxl_usp_info);
}
type_init(cxl_usp_register_type);