hw/cxl: Add a switch mailbox CCI function

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>

4 files changed, 157 insertions, 0 deletions

diff --git a/hw/cxl/cxl-device-utils.c b/hw/cxl/cxl-device-utils.c
index eb86634..f893867 100644
--- a/hw/cxl/cxl-device-utils.c
+++ b/hw/cxl/cxl-device-utils.c
@@ -67,6 +67,9 @@ static uint64_t mailbox_reg_read(void *opaque, hwaddr offset, unsigned size)
 
     if (object_dynamic_cast(OBJECT(cci->intf), TYPE_CXL_TYPE3)) {
         cxl_dstate = &CXL_TYPE3(cci->intf)->cxl_dstate;
+    } else if (object_dynamic_cast(OBJECT(cci->intf),
+                                   TYPE_CXL_SWITCH_MAILBOX_CCI)) {
+        cxl_dstate = &CXL_SWITCH_MAILBOX_CCI(cci->intf)->cxl_dstate;
     } else {
         return 0;
     }
@@ -135,6 +138,9 @@ static void mailbox_reg_write(void *opaque, hwaddr offset, uint64_t value,
 
     if (object_dynamic_cast(OBJECT(cci->intf), TYPE_CXL_TYPE3)) {
         cxl_dstate = &CXL_TYPE3(cci->intf)->cxl_dstate;
+    } else if (object_dynamic_cast(OBJECT(cci->intf),
+                                   TYPE_CXL_SWITCH_MAILBOX_CCI)) {
+        cxl_dstate = &CXL_SWITCH_MAILBOX_CCI(cci->intf)->cxl_dstate;
     } else {
         return;
     }
@@ -365,6 +371,27 @@ void cxl_device_register_init_t3(CXLType3Dev *ct3d)
                               CXL_MAILBOX_MAX_PAYLOAD_SIZE);
 }
 
+void cxl_device_register_init_swcci(CSWMBCCIDev *sw)
+{
+    CXLDeviceState *cxl_dstate = &sw->cxl_dstate;
+    uint64_t *cap_h = cxl_dstate->caps_reg_state64;
+    const int cap_count = 3;
+
+    /* CXL Device Capabilities Array Register */
+    ARRAY_FIELD_DP64(cap_h, CXL_DEV_CAP_ARRAY, CAP_ID, 0);
+    ARRAY_FIELD_DP64(cap_h, CXL_DEV_CAP_ARRAY, CAP_VERSION, 1);
+    ARRAY_FIELD_DP64(cap_h, CXL_DEV_CAP_ARRAY, CAP_COUNT, cap_count);
+
+    cxl_device_cap_init(cxl_dstate, DEVICE_STATUS, 1, 2);
+    device_reg_init_common(cxl_dstate);
+
+    cxl_device_cap_init(cxl_dstate, MAILBOX, 2, 1);
+    mailbox_reg_init_common(cxl_dstate);
+
+    cxl_device_cap_init(cxl_dstate, MEMORY_DEVICE, 0x4000, 1);
+    memdev_reg_init_common(cxl_dstate);
+}
+
 uint64_t cxl_device_get_timestamp(CXLDeviceState *cxl_dstate)
 {
     uint64_t time, delta;
diff --git a/hw/cxl/cxl-mailbox-utils.c b/hw/cxl/cxl-mailbox-utils.c
index 239acc6..28ea02f 100644
--- a/hw/cxl/cxl-mailbox-utils.c
+++ b/hw/cxl/cxl-mailbox-utils.c
@@ -754,6 +754,15 @@ static const struct cxl_cmd cxl_cmd_set[256][256] = {
         cmd_media_clear_poison, 72, 0 },
 };
 
+static const struct cxl_cmd cxl_cmd_set_sw[256][256] = {
+    [TIMESTAMP][GET] = { "TIMESTAMP_GET", cmd_timestamp_get, 0, 0 },
+    [TIMESTAMP][SET] = { "TIMESTAMP_SET", cmd_timestamp_set, 0,
+                         IMMEDIATE_POLICY_CHANGE },
+    [LOGS][GET_SUPPORTED] = { "LOGS_GET_SUPPORTED", cmd_logs_get_supported, 0,
+                              0 },
+    [LOGS][GET_LOG] = { "LOGS_GET_LOG", cmd_logs_get_log, 0x18, 0 },
+};
+
 int cxl_process_cci_message(CXLCCI *cci, uint8_t set, uint8_t cmd,
                             size_t len_in, uint8_t *pl_in, size_t *len_out,
                             uint8_t *pl_out, bool *bg_started)
@@ -795,6 +804,15 @@ void cxl_init_cci(CXLCCI *cci, size_t payload_max)
     }
 }
 
+void cxl_initialize_mailbox_swcci(CXLCCI *cci, DeviceState *intf,
+                                  DeviceState *d, size_t payload_max)
+{
+    cci->cxl_cmd_set = cxl_cmd_set_sw;
+    cci->d = d;
+    cci->intf = intf;
+    cxl_init_cci(cci, payload_max);
+}
+
 void cxl_initialize_mailbox_t3(CXLCCI *cci, DeviceState *d, size_t payload_max)
 {
     cci->cxl_cmd_set = cxl_cmd_set;
diff --git a/hw/cxl/meson.build b/hw/cxl/meson.build
index e261ff3..ea0aebf 100644
--- a/hw/cxl/meson.build
+++ b/hw/cxl/meson.build
@@ -6,6 +6,7 @@ system_ss.add(when: 'CONFIG_CXL',
                    'cxl-host.c',
                    'cxl-cdat.c',
                    'cxl-events.c',
+                   'switch-mailbox-cci.c',
                ),
                if_false: files(
                    'cxl-host-stubs.c',
diff --git a/hw/cxl/switch-mailbox-cci.c b/hw/cxl/switch-mailbox-cci.c
new file mode 100644
index 0000000..ba399c6
--- /dev/null
+++ b/hw/cxl/switch-mailbox-cci.c
@@ -0,0 +1,111 @@
+/*
+ * 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);