[v3,5/6] cxl/mailbox,type3: Implement MHD get info command callback

Commit Message

Gregory Price Sept. 6, 2023, 12:15 a.m. UTC

For multi-headed type 3 devices, this command reports logical device
mappings for each head.  Implement a callback which can be
initialized by MHD devices to field these commands.

Reports "unsupported" if the command is called but the callback is
not implemented.

Signed-off-by: Gregory Price <[e-mail]>
---
 hw/cxl/cxl-mailbox-utils.c  | 21 +++++++++++++++++++++
 hw/mem/cxl_type3.c          |  1 +
 include/hw/cxl/cxl_device.h |  6 ++++++
 3 files changed, 28 insertions(+)

Patch

diff --git a/hw/cxl/cxl-mailbox-utils.c b/hw/cxl/cxl-mailbox-utils.c
index b64bbdf45d..3177a59de3 100644
--- a/hw/cxl/cxl-mailbox-utils.c
+++ b/hw/cxl/cxl-mailbox-utils.c
@@ -91,6 +91,8 @@  enum {
         #define GET_PHYSICAL_PORT_STATE     0x1
     TUNNEL = 0x53,
         #define MANAGEMENT_COMMAND     0x0
+    MHD = 0x55,
+        #define GET_MHD_INFO 0x0
 };
 
 /* CCI Message Format CXL r3.0 Figure 7-19 */
@@ -184,6 +186,23 @@  static CXLRetCode cmd_tunnel_management_cmd(const struct cxl_cmd *cmd,
     return CXL_MBOX_INVALID_INPUT;
 }
 
+/*
+ * CXL r3.0 section 7.6.7.5.1 - Get Multi-Headed Info (Opcode 5500h)
+ */
+static CXLRetCode cmd_mhd_get_info(const struct cxl_cmd *cmd,
+                                   uint8_t *payload_in, size_t len_in,
+                                   uint8_t *payload_out, size_t *len_out,
+                                   CXLCCI *cci)
+{
+    CXLType3Dev *ct3d = CXL_TYPE3(cci->d);
+    CXLType3Class *cvc = CXL_TYPE3_GET_CLASS(ct3d);
+    if (cvc->mhd_get_info) {
+        return cvc->mhd_get_info(cmd, payload_in, len_in, payload_out,
+                                 len_out, cci);
+    }
+    return CXL_MBOX_UNSUPPORTED;
+}
+
 static CXLRetCode cmd_events_get_records(const struct cxl_cmd *cmd,
                                          uint8_t *payload_in, size_t len_in,
                                          uint8_t *payload_out, size_t *len_out,
@@ -1598,6 +1617,8 @@  static const struct cxl_cmd cxl_cmd_set[256][256] = {
         cmd_media_inject_poison, 8, 0 },
     [MEDIA_AND_POISON][CLEAR_POISON] = { "MEDIA_AND_POISON_CLEAR_POISON",
         cmd_media_clear_poison, 72, 0 },
+    [MHD][GET_MHD_INFO] = {"GET_MULTI_HEADED_INFO",
+        cmd_mhd_get_info, 2, 0},
 };
 
 static const struct cxl_cmd cxl_cmd_set_dcd[256][256] = {
diff --git a/hw/mem/cxl_type3.c b/hw/mem/cxl_type3.c
index 1fb3ffeca8..307d7c1fd8 100644
--- a/hw/mem/cxl_type3.c
+++ b/hw/mem/cxl_type3.c
@@ -2120,6 +2120,7 @@  static void ct3_class_init(ObjectClass *oc, void *data)
     cvc->get_lsa = get_lsa;
     cvc->set_lsa = set_lsa;
     cvc->set_cacheline = set_cacheline;
+    cvc->mhd_get_info = NULL;
     cvc->mhd_access_valid = NULL;
 }
 
diff --git a/include/hw/cxl/cxl_device.h b/include/hw/cxl/cxl_device.h
index 37893f8626..4a5d4bd98b 100644
--- a/include/hw/cxl/cxl_device.h
+++ b/include/hw/cxl/cxl_device.h
@@ -508,6 +508,12 @@  struct CXLType3Class {
     bool (*set_cacheline)(CXLType3Dev *ct3d, uint64_t dpa_offset, uint8_t *data);
 
     /* Multi-headed Device */
+    CXLRetCode (*mhd_get_info)(const struct cxl_cmd *cmd,
+                               uint8_t *payload_in,
+                               size_t len_in,
+                               uint8_t *payload_out,
+                               size_t *len_out,
+                               CXLCCI *cci);
     bool (*mhd_access_valid)(PCIDevice *d, uint64_t addr, unsigned int size);
 };