[RFC PATCH v2 3/3] hw/peci: add support for EndPointConfig reads

[Titus Rwantare <titusr@google.com>]

Signed-off-by: Titus Rwantare <titusr@google.com>
Reviewed-by: Hao Wu <wuhaotsh@google.com>
---
 hw/peci/peci-client.c  | 63 ++++++++++++++++++++++++++++++++++++++++++
 hw/peci/peci-core.c    | 44 +++++++++++++++++++++++++++--
 include/hw/peci/peci.h | 23 +++++++++++++++
 3 files changed, 128 insertions(+), 2 deletions(-)

diff --git a/hw/peci/peci-client.c b/hw/peci/peci-client.c
index 2aa797b5f6..e54735bb53 100644
--- a/hw/peci/peci-client.c
+++ b/hw/peci/peci-client.c
@@ -23,6 +23,64 @@
 
 #define PECI_CLIENT_DEFAULT_TEMP 30
 
+/* TODO: move this out into a config */
+static const PECIEndPointConfig spr_config[] = {
+    {
+        .hdr.msg_type = LOCAL_PCI_CFG,
+        .hdr.addr_type = 0x4,
+        .hdr.bus = 31,
+        .hdr.dev = 0,
+        .hdr.func = 2,
+        .hdr.reg = 0xD4,
+        .data = BIT(31)
+    },
+    {
+        .hdr.msg_type = LOCAL_PCI_CFG,
+        .hdr.addr_type = 0x4,
+        .hdr.bus = 31,
+        .hdr.dev = 0,
+        .hdr.func = 2,
+        .hdr.reg = 0xD0,
+        .data = BIT(31) | BIT(30)
+    },
+    {
+        .hdr.msg_type = LOCAL_PCI_CFG,
+        .hdr.addr_type = 0x4,
+        .hdr.bus = 31,
+        .hdr.dev = 30,
+        .hdr.func = 6,
+        .hdr.reg = 0x84,
+        .data = 0x03FFFFFF
+    },
+    {
+        .hdr.msg_type = LOCAL_PCI_CFG,
+        .hdr.addr_type = 0x4,
+        .hdr.bus = 31,
+        .hdr.dev = 30,
+        .hdr.func = 6,
+        .hdr.reg = 0x80,
+        .data = 0xFFFFFFFF
+    },
+    {
+        .hdr.msg_type = LOCAL_PCI_CFG,
+        .hdr.addr_type = 0x4,
+        .hdr.bus = 31,
+        .hdr.dev = 30,
+        .hdr.func = 6,
+        .hdr.reg = 0x84,
+        .data = 0x03FFFFFF
+    },
+    {
+        .hdr.msg_type = LOCAL_PCI_CFG,
+        .hdr.addr_type = 0x4,
+        .hdr.bus = 31,
+        .hdr.dev = 30,
+        .hdr.func = 6,
+        .hdr.reg = 0x80,
+        .data = 0xFFFFFFFF
+    },
+};
+
 static void peci_client_update_temps(PECIClientDevice *client)
 {
     uint8_t temp_cpu = 0;
@@ -115,7 +173,12 @@ PECIClientDevice *peci_add_client(PECIBus *bus,
         break;
 
     case FAM6_ICELAKE_X:
+        client->revision = 0x40;
+        break;
+
     case FAM6_SAPPHIRE_RAPIDS_X:
+        client->endpoint_conf = spr_config;
+        client->num_entries = sizeof(spr_config) / sizeof(spr_config[0]);
         client->revision = 0x40;
         client->ucode = 0x8c0004a0;
         break;
diff --git a/hw/peci/peci-core.c b/hw/peci/peci-core.c
index 8210bfa198..0650a03e2d 100644
--- a/hw/peci/peci-core.c
+++ b/hw/peci/peci-core.c
@@ -22,6 +22,47 @@
 #define PECI_FCS_OK         0
 #define PECI_FCS_ERR        1
 
+static PECIEndPointHeader peci_fmt_end_pt_header(PECICmd *pcmd)
+{
+    uint32_t val = pcmd->rx[7] | (pcmd->rx[8] << 8) | (pcmd->rx[9] << 16) |
+                  (pcmd->rx[10] << 24);
+
+    PECIEndPointHeader header = {
+        .msg_type = pcmd->rx[1],
+        .addr_type = pcmd->rx[5],
+        .bus = (val >> 20) & 0xFF,
+        .dev = (val >> 15) & 0x1F,
+        .func = (val >> 12) & 0x7,
+        .reg = val & 0xFFF,
+    };
+
+    return header;
+}
+
+static void peci_rd_endpoint_cfg(PECIClientDevice *client, PECICmd *pcmd)
+{
+    PECIPkgCfg *resp = (PECIPkgCfg *)pcmd->tx;
+    PECIEndPointHeader req = peci_fmt_end_pt_header(pcmd);
+    PECIEndPointConfig const *c;
+
+    if (client->endpoint_conf) {
+        for (size_t i = 0; i < client->num_entries; i++) {
+            c = &client->endpoint_conf[i];
+
+            if (!memcmp(&req, &c->hdr, sizeof(PECIEndPointHeader))) {
+                    resp->data = c->data;
+                    resp->cc = PECI_DEV_CC_SUCCESS;
+                    return;
+            }
+        }
+    }
+
+    qemu_log_mask(LOG_UNIMP,
+                  "%s: msg_type: 0x%x bus: %u, dev: %u, func: %u, reg: 0x%x\n",
+                  __func__, req.msg_type, req.bus, req.dev, req.func, req.reg);
+
+}
+
 static void peci_rd_pkg_cfg(PECIClientDevice *client, PECICmd *pcmd)
 {
     PECIPkgCfg *resp = (PECIPkgCfg *)pcmd->tx;
@@ -153,8 +194,7 @@ int peci_handle_cmd(PECIBus *bus, PECICmd *pcmd)
         break;
 
     case PECI_CMD_RD_END_PT_CFG:
-        qemu_log_mask(LOG_UNIMP, "%s: unimplemented CMD_RD_END_PT_CFG\n",
-                      __func__);
+        peci_rd_endpoint_cfg(client, pcmd);
         break;
 
     default:
diff --git a/include/hw/peci/peci.h b/include/hw/peci/peci.h
index 1a0abe65cd..3dcfe82245 100644
--- a/include/hw/peci/peci.h
+++ b/include/hw/peci/peci.h
@@ -112,6 +112,26 @@ typedef struct PECITempTarget {
     uint8_t tjmax;
 } PECITempTarget;
 
+typedef enum PECIEndPointType {
+    LOCAL_PCI_CFG = 3,
+    PCI_CFG,
+    MMIO_BDF,
+} PECIEndPointType;
+
+typedef struct __attribute__ ((__packed__)) {
+    PECIEndPointType msg_type;
+    uint8_t addr_type;
+    uint8_t bus;
+    uint8_t dev;
+    uint8_t func;
+    uint16_t reg;
+} PECIEndPointHeader;
+
+typedef struct {
+    PECIEndPointHeader hdr;
+    uint32_t data;
+} PECIEndPointConfig;
+
 #define PECI_BASE_ADDR              0x30
 #define PECI_BUFFER_SIZE            0x100
 #define PECI_NUM_CPUS_MAX           56
@@ -140,6 +160,9 @@ typedef struct PECIClientDevice {
     uint8_t dimm_temp_max;
     uint8_t dimm_temp[PECI_NUM_DIMMS_MAX];
 
+    /* EndPtConfig info */
+    PECIEndPointConfig const *endpoint_conf;
+    size_t num_entries;
 } PECIClientDevice;
 
 #define TYPE_PECI_CLIENT "peci-client"
-- 
2.37.3.968.ga6b4b080e4-goog