[PATCH 4/9] cxl-mailbox-utils: 0x5601 - FMAPI Get Host Region Config

[anisa.su887@gmail.com]

From: Anisa Su <anisa.su@samsung.com>

FM DCD Management command 0x5601 implemented per CXL r3.2 Spec Section 7.6.7.6.2

Signed-off-by: Anisa Su <anisa.su@samsung.com>
---
 hw/cxl/cxl-mailbox-utils.c | 97 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 97 insertions(+)

diff --git a/hw/cxl/cxl-mailbox-utils.c b/hw/cxl/cxl-mailbox-utils.c
index e9991fd1a7..4bb51bf3e8 100644
--- a/hw/cxl/cxl-mailbox-utils.c
+++ b/hw/cxl/cxl-mailbox-utils.c
@@ -124,6 +124,7 @@ enum {
         #define GET_MHD_INFO 0x0
     FMAPI_DCD_MGMT = 0x56,
         #define GET_DCD_INFO 0x0
+        #define GET_HOST_DC_REGION_CONFIG 0x1
 };
 
 /* CCI Message Format CXL r3.1 Figure 7-19 */
@@ -3399,6 +3400,100 @@ static CXLRetCode cmd_fm_get_dcd_info(const struct cxl_cmd *cmd,
     return CXL_MBOX_SUCCESS;
 }
 
+/*
+ * CXL r3.2 section 7.6.7.6.2: Get Host DC Region Configuration (Opcode 5601h)
+ */
+static CXLRetCode cmd_fm_get_host_dc_region_config(const struct cxl_cmd *cmd,
+                                                   uint8_t *payload_in,
+                                                   size_t len_in,
+                                                   uint8_t *payload_out,
+                                                   size_t *len_out,
+                                                   CXLCCI *cci)
+{
+    struct {
+        uint16_t host_id;
+        uint8_t region_cnt;
+        uint8_t start_rid;
+    } QEMU_PACKED *in;
+    struct {
+        uint16_t host_id;
+        uint8_t num_regions;
+        uint8_t regions_returned;
+        struct {
+            uint64_t base;
+            uint64_t decode_len;
+            uint64_t region_len;
+            uint64_t block_size;
+            uint8_t dsmas_flags;
+            uint8_t rsvd1[3];
+            uint8_t sanitize;
+            uint8_t rsvd2[3];
+        } QEMU_PACKED records[];
+    } QEMU_PACKED *out;
+    struct {
+        uint32_t num_extents_supported;
+        uint32_t num_extents_available;
+        uint32_t num_tags_supported;
+        uint32_t num_tags_available;
+    } QEMU_PACKED *extra_out;
+    CXLType3Dev *ct3d = CXL_TYPE3(cci->d);
+    uint16_t record_count, out_pl_len, i;
+    uint8_t start_rid;
+
+    if (ct3d->dc.num_regions == 0) {
+        return CXL_MBOX_UNSUPPORTED;
+    }
+
+    in = (void *)payload_in;
+    if (in->start_rid >= ct3d->dc.num_regions) {
+        return CXL_MBOX_INVALID_INPUT;
+    }
+
+    start_rid = in->start_rid;
+    record_count = MIN(ct3d->dc.num_regions - start_rid, in->region_cnt);
+
+    out = (void *)payload_out;
+    out_pl_len = sizeof(*out) + record_count * sizeof(out->records[0]);
+
+    extra_out = (void *)(out) + out_pl_len;
+    out_pl_len += sizeof(*extra_out);
+
+    assert(*len_out <= CXL_MAILBOX_MAX_PAYLOAD_SIZE);
+
+    /* TODO: For now, fix host id to be 0 */
+    stw_le_p(&out->host_id, 0);
+    out->num_regions = ct3d->dc.num_regions;
+    out->regions_returned = record_count;
+
+    for (i = 0; i < record_count; i++) {
+        stq_le_p(&out->records[i].base,
+                 ct3d->dc.regions[start_rid + i].base);
+        stq_le_p(&out->records[i].decode_len,
+                 ct3d->dc.regions[start_rid + i].decode_len /
+                 CXL_CAPACITY_MULTIPLIER);
+        stq_le_p(&out->records[i].region_len,
+                 ct3d->dc.regions[start_rid + i].len);
+        stq_le_p(&out->records[i].block_size,
+                 ct3d->dc.regions[start_rid + i].block_size);
+        out->records[i].dsmas_flags =
+            ct3d->dc.regions[start_rid + i].dsmas_flags;
+        out->records[i].sanitize = 0;
+    }
+    /*
+     * TODO: Assign values once extents and tags are introduced
+     * to use.
+     */
+    stl_le_p(&extra_out->num_extents_supported, CXL_NUM_EXTENTS_SUPPORTED);
+    stl_le_p(&extra_out->num_extents_available, CXL_NUM_EXTENTS_SUPPORTED -
+             ct3d->dc.total_extent_count);
+    stl_le_p(&extra_out->num_tags_supported, CXL_NUM_TAGS_SUPPORTED);
+    stl_le_p(&extra_out->num_tags_available, CXL_NUM_TAGS_SUPPORTED);
+
+    *len_out = out_pl_len;
+
+    return CXL_MBOX_SUCCESS;
+}
+
 static const struct cxl_cmd cxl_cmd_set[256][256] = {
     [INFOSTAT][BACKGROUND_OPERATION_ABORT] = { "BACKGROUND_OPERATION_ABORT",
         cmd_infostat_bg_op_abort, 0, 0 },
@@ -3523,6 +3618,8 @@ static const struct cxl_cmd cxl_cmd_set_sw[256][256] = {
 static const struct cxl_cmd cxl_cmd_set_fm_dcd[256][256] = {
     [FMAPI_DCD_MGMT][GET_DCD_INFO] = { "GET_DCD_INFO",
         cmd_fm_get_dcd_info, 0, 0},
+    [FMAPI_DCD_MGMT][GET_HOST_DC_REGION_CONFIG] = { "GET_HOST_DC_REGION_CONFIG",
+        cmd_fm_get_host_dc_region_config, 4, 0},
 };
 
 /*
-- 
2.47.2