new file mode 100644
@@ -0,0 +1,229 @@
+/*
+ * Emulated CXL Switch Downstream Port
+ *
+ * Copyright (c) 2022 Huawei Technologies.
+ *
+ * Based on xio31130_downstream.c
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "qemu/osdep.h"
+#include "hw/pci/msi.h"
+#include "hw/pci/pcie.h"
+#include "hw/pci/pcie_port.h"
+#include "qapi/error.h"
+
+typedef struct CXLDownStreamPort {
+ /*< private >*/
+ PCIESlot parent_obj;
+
+ /*< public >*/
+ CXLComponentState cxl_cstate;
+} CXLDownstreamPort;
+
+#define TYPE_CXL_DSP "cxl-downstream"
+DECLARE_INSTANCE_CHECKER(CXLDownstreamPort, CXL_DSP, TYPE_CXL_DSP)
+
+#define CXL_DOWNSTREAM_PORT_MSI_OFFSET 0x70
+#define CXL_DOWNSTREAM_PORT_MSI_NR_VECTOR 1
+#define CXL_DOWNSTREAM_PORT_EXP_OFFSET 0x90
+#define CXL_DOWNSTREAM_PORT_AER_OFFSET 0x100
+#define CXL_DOWNSTREAM_PORT_DVSEC_OFFSET \
+ (CXL_DOWNSTREAM_PORT_AER_OFFSET + PCI_ERR_SIZEOF)
+
+static void latch_registers(CXLDownstreamPort *dsp)
+{
+ uint32_t *reg_state = dsp->cxl_cstate.crb.cache_mem_registers;
+
+ cxl_component_register_init_common(reg_state, CXL2_DOWNSTREAM_PORT);
+}
+
+/* TODO: Look at sharing this code acorss all CXL port types */
+static void cxl_dsp_dvsec_write_config(PCIDevice *dev, uint32_t addr,
+ uint32_t val, int len)
+{
+ CXLDownstreamPort *dsp = CXL_DSP(dev);
+ CXLComponentState *cxl_cstate = &dsp->cxl_cstate;
+
+ if (range_contains(&cxl_cstate->dvsecs[EXTENSIONS_PORT_DVSEC], addr)) {
+ uint8_t *reg = &dev->config[addr];
+ addr -= cxl_cstate->dvsecs[EXTENSIONS_PORT_DVSEC].lob;
+ if (addr == PORT_CONTROL_OFFSET) {
+ if (pci_get_word(reg) & PORT_CONTROL_UNMASK_SBR) {
+ /* unmask SBR */
+ }
+ if (pci_get_word(reg) & PORT_CONTROL_ALT_MEMID_EN) {
+ /* Alt Memory & ID Space Enable */
+ }
+ }
+ }
+}
+
+static void cxl_dsp_config_write(PCIDevice *d, uint32_t address,
+ uint32_t val, int len)
+{
+ uint16_t slt_ctl, slt_sta;
+
+ pcie_cap_slot_get(d, &slt_ctl, &slt_sta);
+ pci_bridge_write_config(d, address, val, len);
+ pcie_cap_flr_write_config(d, address, val, len);
+ pcie_cap_slot_write_config(d, slt_ctl, slt_sta, address, val, len);
+ pcie_aer_write_config(d, address, val, len);
+
+ cxl_dsp_dvsec_write_config(d, address, val, len);
+}
+
+static void cxl_dsp_reset(DeviceState *qdev)
+{
+ PCIDevice *d = PCI_DEVICE(qdev);
+ CXLDownstreamPort *dsp = CXL_DSP(qdev);
+
+ pcie_cap_deverr_reset(d);
+ pcie_cap_slot_reset(d);
+ pcie_cap_arifwd_reset(d);
+ pci_bridge_reset(qdev);
+
+ latch_registers(dsp);
+}
+
+static void build_dvsecs(CXLComponentState *cxl)
+{
+ uint8_t *dvsec;
+
+ dvsec = (uint8_t *)&(struct cxl_dvsec_port_extensions){ 0 };
+ cxl_component_create_dvsec(cxl, EXTENSIONS_PORT_DVSEC_LENGTH,
+ EXTENSIONS_PORT_DVSEC,
+ EXTENSIONS_PORT_DVSEC_REVID, dvsec);
+ dvsec = (uint8_t *)&(struct cxl_dvsec_port_flexbus){
+ .cap = 0x26, /* IO, Mem, non-MLD */
+ .ctrl = 0,
+ .status = 0x26, /* same */
+ .rcvd_mod_ts_data_phase1 = 0xef, /* WTF? */
+ };
+ cxl_component_create_dvsec(cxl, PCIE_FLEXBUS_PORT_DVSEC_LENGTH_2_0,
+ PCIE_FLEXBUS_PORT_DVSEC,
+ PCIE_FLEXBUS_PORT_DVSEC_REVID_2_0, dvsec);
+
+ dvsec = (uint8_t *)&(struct cxl_dvsec_register_locator){
+ .rsvd = 0,
+ .reg0_base_lo = RBI_COMPONENT_REG | CXL_COMPONENT_REG_BAR_IDX,
+ .reg0_base_hi = 0,
+ };
+ cxl_component_create_dvsec(cxl, REG_LOC_DVSEC_LENGTH, REG_LOC_DVSEC,
+ REG_LOC_DVSEC_REVID, dvsec);
+}
+
+static void cxl_dsp_realize(PCIDevice *d, Error **errp)
+{
+ PCIEPort *p = PCIE_PORT(d);
+ PCIESlot *s = PCIE_SLOT(d);
+ CXLDownstreamPort *dsp = CXL_DSP(d);
+ CXLComponentState *cxl_cstate = &dsp->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_DOWNSTREAM_PORT_MSI_OFFSET,
+ CXL_DOWNSTREAM_PORT_MSI_NR_VECTOR,
+ true, true, errp);
+ if (rc) {
+ assert(rc == -ENOTSUP);
+ goto err_bridge;
+ }
+
+ rc = pcie_cap_init(d, CXL_DOWNSTREAM_PORT_EXP_OFFSET,
+ PCI_EXP_TYPE_DOWNSTREAM, p->port,
+ errp);
+ if (rc < 0) {
+ goto err_msi;
+ }
+
+ pcie_cap_flr_init(d);
+ pcie_cap_deverr_init(d);
+ pcie_cap_slot_init(d, s);
+ pcie_cap_arifwd_init(d);
+
+ pcie_chassis_create(s->chassis);
+ rc = pcie_chassis_add_slot(s);
+ if (rc < 0) {
+ error_setg(errp, "Can't add chassis slot, error %d", rc);
+ goto err_pcie_cap;
+ }
+
+ rc = pcie_aer_init(d, PCI_ERR_VER, CXL_DOWNSTREAM_PORT_AER_OFFSET,
+ PCI_ERR_SIZEOF, errp);
+ if (rc < 0) {
+ goto err_chassis;
+ }
+
+ cxl_cstate->dvsec_offset = CXL_DOWNSTREAM_PORT_DVSEC_OFFSET;
+ cxl_cstate->pdev = d;
+ build_dvsecs(cxl_cstate);
+ cxl_component_register_block_init(OBJECT(d), cxl_cstate, TYPE_CXL_DSP);
+ pci_register_bar(d, CXL_COMPONENT_REG_BAR_IDX,
+ PCI_BASE_ADDRESS_SPACE_MEMORY |
+ PCI_BASE_ADDRESS_MEM_TYPE_64,
+ component_bar);
+
+ return;
+
+ err_chassis:
+ pcie_chassis_del_slot(s);
+ err_pcie_cap:
+ pcie_cap_exit(d);
+ err_msi:
+ msi_uninit(d);
+ err_bridge:
+ pci_bridge_exitfn(d);
+}
+
+static void cxl_dsp_exitfn(PCIDevice *d)
+{
+ PCIESlot *s = PCIE_SLOT(d);
+
+ pcie_aer_exit(d);
+ pcie_chassis_del_slot(s);
+ pcie_cap_exit(d);
+ msi_uninit(d);
+ pci_bridge_exitfn(d);
+}
+
+static void cxl_dsp_class_init(ObjectClass *oc, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(oc);
+ PCIDeviceClass *k = PCI_DEVICE_CLASS(oc);
+
+ k->is_bridge = true;
+ k->config_write = cxl_dsp_config_write;
+ k->realize = cxl_dsp_realize;
+ k->exit = cxl_dsp_exitfn;
+ k->vendor_id = 0x19e5; /* Huawei */
+ k->device_id = 0xa129; /* Emulated CXL Switch Downstream Port */
+ k->revision = 0;
+ set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
+ dc->desc = "CXL Switch Downstream Port";
+ dc->reset = cxl_dsp_reset;
+}
+
+static const TypeInfo cxl_dsp_info = {
+ .name = TYPE_CXL_DSP,
+ .instance_size = sizeof(CXLDownstreamPort),
+ .parent = TYPE_PCIE_SLOT,
+ .class_init = cxl_dsp_class_init,
+ .interfaces = (InterfaceInfo[]) {
+ { INTERFACE_PCIE_DEVICE },
+ { INTERFACE_CXL_DEVICE },
+ { }
+ },
+};
+
+static void cxl_dsp_register_type(void)
+{
+ type_register_static(&cxl_dsp_info);
+}
+
+type_init(cxl_dsp_register_type);
@@ -5,7 +5,7 @@ pci_ss.add(when: 'CONFIG_IOH3420', if_true: files('ioh3420.c'))
pci_ss.add(when: 'CONFIG_PCIE_PORT', if_true: files('pcie_root_port.c', 'gen_pcie_root_port.c', 'pcie_pci_bridge.c'))
pci_ss.add(when: 'CONFIG_PXB', if_true: files('pci_expander_bridge.c'))
pci_ss.add(when: 'CONFIG_XIO3130', if_true: files('xio3130_upstream.c', 'xio3130_downstream.c'))
-pci_ss.add(when: 'CONFIG_CXL', if_true: files('cxl_root_port.c', 'cxl_upstream.c'))
+pci_ss.add(when: 'CONFIG_CXL', if_true: files('cxl_root_port.c', 'cxl_upstream.c', 'cxl_downstream.c'))
# NewWorld PowerMac
pci_ss.add(when: 'CONFIG_DEC_PCI', if_true: files('dec.c'))
Emulation of a simple CXL Switch downstream port. The Device ID has been allocated for this use. Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> --- hw/pci-bridge/cxl_downstream.c | 229 +++++++++++++++++++++++++++++++++ hw/pci-bridge/meson.build | 2 +- 2 files changed, 230 insertions(+), 1 deletion(-)