[RFC 3/7] hw/mem/cxl_type3: Add a parameter to pass number of DC regions the device supports in qemu command line

[Fan Ni]

From: Fan Ni <nifan@outlook.com>

Add a property 'num-dc-regions' to ct3_props to allow users to create DC
regions.
With the change, users can control the number of DC regions the device
supports.
To make it easier, other parameters of the region like region base, length,
and block size are hard coded. If desired, these parameters
can be added easily.

Signed-off-by: Fan Ni <fan.ni@samsung.com>
---
 hw/mem/cxl_type3.c | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/hw/mem/cxl_type3.c b/hw/mem/cxl_type3.c
index 2b483d3d8e..b9c375d9b4 100644
--- a/hw/mem/cxl_type3.c
+++ b/hw/mem/cxl_type3.c
@@ -684,6 +684,34 @@ static void ct3d_reg_write(void *opaque, hwaddr offset, 
uint64_t value,
     }
 }
 
+/*
+ * Create a dc region to test "Get Dynamic Capacity Configuration" command.
+ */
+static int cxl_create_toy_regions(CXLType3Dev *ct3d)
+{
+       int i;
+       uint64_t region_base = ct3d->hostvmem?ct3d->hostvmem->size
+               + ct3d->hostpmem->size:ct3d->hostpmem->size;
+       uint64_t region_len = 1024*1024*1024;
+       uint64_t decode_len = 4; /* 4*256MB */
+       uint64_t blk_size = 2*1024*1024;
+       struct CXLDCD_Region *region;
+
+       for (i = 0; i < ct3d->dc.num_regions; i++) {
+               region = &ct3d->dc.regions[i];
+               region->base = region_base;
+               region->decode_len = decode_len;
+               region->len = region_len;
+               region->block_size = blk_size;
+               /* dsmad_handle is set when creating cdat table entries */
+               region->flags = 0;
+
+               region_base += region->len;
+       }
+
+       return 0;
+}
+
 static bool cxl_setup_memory(CXLType3Dev *ct3d, Error **errp)
 {
     DeviceState *ds = DEVICE(ct3d);
@@ -752,6 +780,9 @@ static bool cxl_setup_memory(CXLType3Dev *ct3d, Error 
**errp)
         g_free(p_name);
     }
 
+       if (cxl_create_toy_regions(ct3d))
+               return false;
+
     return true;
 }
 
@@ -1036,6 +1067,7 @@ static Property ct3_props[] = {
     DEFINE_PROP_UINT64("sn", CXLType3Dev, sn, UI64_NULL),
     DEFINE_PROP_STRING("cdat", CXLType3Dev, cxl_cstate.cdat.filename),
     DEFINE_PROP_UINT16("spdm", CXLType3Dev, spdm_port, 0),
+       DEFINE_PROP_UINT8("num-dc-regions", CXLType3Dev, dc.num_regions, 0),
     DEFINE_PROP_END_OF_LIST(),
 };
 
-- 
2.25.1