[1/9] cxl/type3: Add supported block sizes bitmask to CXLDCRegion struct

Commit Message

[e-mail] March 17, 2025, 4:31 p.m. UTC

From: Anisa Su <[e-mail]>

Add supported_blk_size field to CXLDCRegion struct in preparation for
next patch. It is needed by command 0x5600 Get DC Region Config.

Signed-off-by: Anisa Su <[e-mail]>
---
 hw/mem/cxl_type3.c          | 3 +++
 include/hw/cxl/cxl_device.h | 1 +
 2 files changed, 4 insertions(+)

Patch

diff --git a/hw/mem/cxl_type3.c b/hw/mem/cxl_type3.c
index 11c38a9292..731497ebda 100644
--- a/hw/mem/cxl_type3.c
+++ b/hw/mem/cxl_type3.c
@@ -8,6 +8,7 @@ 
  *
  * SPDX-License-Identifier: GPL-v2-only
  */
+#include <math.h>
 
 #include "qemu/osdep.h"
 #include "qemu/units.h"
@@ -766,6 +767,7 @@  static bool cxl_create_dc_regions(CXLType3Dev *ct3d, Error **errp)
     uint64_t region_len;
     uint64_t decode_len;
     uint64_t blk_size = 2 * MiB;
+    uint64_t supported_blk_size_bitmask = BIT((int) log2(blk_size));
     CXLDCRegion *region;
     MemoryRegion *mr;
     uint64_t dc_size;
@@ -811,6 +813,7 @@  static bool cxl_create_dc_regions(CXLType3Dev *ct3d, Error **errp)
             .block_size = blk_size,
             /* dsmad_handle set when creating CDAT table entries */
             .flags = 0,
+            .supported_blk_size_bitmask = supported_blk_size_bitmask,
         };
         ct3d->dc.total_capacity += region->len;
         region->blk_bitmap = bitmap_new(region->len / region->block_size);
diff --git a/include/hw/cxl/cxl_device.h b/include/hw/cxl/cxl_device.h
index ca515cab13..bebed04085 100644
--- a/include/hw/cxl/cxl_device.h
+++ b/include/hw/cxl/cxl_device.h
@@ -608,6 +608,7 @@  typedef struct CXLDCRegion {
     uint32_t dsmadhandle;
     uint8_t flags;
     unsigned long *blk_bitmap;
+    uint64_t supported_blk_size_bitmask;
 } CXLDCRegion;
 
 typedef struct CXLSetFeatureInfo {