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>

1 files changed, 18 insertions, 0 deletions

diff --git a/hw/cxl/cxl-mailbox-utils.c b/hw/cxl/cxl-mailbox-utils.c
index 239acc659d..28ea02fcbe 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;