[RFC 2/2] cxl/mailbox: interface to add CCI commands to an existing CCI

[Gregory Price]

This enables wrapper devices to customize the base device's CCI
(for example, with custom commands outside the specification)
without the need to change the base device.

The also enabled the base device to dispatch those commands without
requiring additional driver support.

Signed-off-by: Gregory Price <gregory.pr...@memverge.com>

---
 hw/cxl/cxl-mailbox-utils.c         |  19 +++++++++++++++++++
 include/hw/cxl/cxl_device.h        |   2 ++
 2 files changed, 21 insertions(+)

diff --git a/hw/cxl/cxl-mailbox-utils.c b/hw/cxl/cxl-mailbox-utils.c
index ddee3f1718..cad0cd0adb 100644
--- a/hw/cxl/cxl-mailbox-utils.c
+++ b/hw/cxl/cxl-mailbox-utils.c
@@ -1383,6 +1383,25 @@ static void cxl_copy_cci_commands(CXLCCI *cci, const 
struct cxl_cmd (*cxl_cmds)[
     }
 }
 
+void cxl_add_cci_commands(CXLCCI *cci, const struct cxl_cmd 
(*cxl_cmd_set)[256], size_t payload_max)
+{
+    cci->payload_max = payload_max > cci->payload_max ? payload_max : 
cci->payload_max;
+    for (int set = 0; set < 256; set++) {
+        for (int cmd = 0; cmd < 256; cmd++) {
+            if (cxl_cmd_set[set][cmd].handler) {
+                const struct cxl_cmd *c = &cxl_cmd_set[set][cmd];
+                cci->cxl_cmd_set[set][cmd] = *c;
+                struct cel_log *log =
+                    &cci->cel_log[cci->cel_size];
+
+                log->opcode = (set << 8) | cmd;
+                log->effect = c->effect;
+                cci->cel_size++;
+            }
+        }
+    }
+}
+
 void cxl_initialize_mailbox_swcci(CXLCCI *cci, DeviceState *intf, DeviceState 
*d, size_t payload_max)
 {
     cxl_copy_cci_commands(cci, cxl_cmd_set_sw);

diff --git a/include/hw/cxl/cxl_device.h b/include/hw/cxl/cxl_device.h
index 9a3c8b2dfa..abc8405cc5 100644
--- a/include/hw/cxl/cxl_device.h
+++ b/include/hw/cxl/cxl_device.h
@@ -297,6 +297,8 @@ void cxl_initialize_mailbox_t3(CXLCCI *cci, DeviceState *d, 
size_t payload_max);
 void cxl_initialize_mailbox_swcci(CXLCCI *cci, DeviceState *intf,
                                   DeviceState *d, size_t payload_max);
 void cxl_init_cci(CXLCCI *cci, size_t payload_max);
+void cxl_add_cci_commands(CXLCCI *cci, const struct cxl_cmd 
(*cxl_cmd_set)[256],
+                          size_t payload_max);
 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,
-- 
2.39.1