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hw/cxl: fix DC extent capacity tracking

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Per cxl r3.2 Section 9.13.3.3, extent capacity tracking should include
extents in different states including added, pending, etc.

Before the change, for the in-device extent number tracking purpose, we only
have "total_extent_count" defined, which only tracks the number of
extents accepted. However, we need to track number of extents in other
states also, for now it is extents pending-to-add.

To fix that, we introduce a new counter for dynamic capacity
"nr_extents_accepted" which explicitly tracks number of the extents
accepted by the hosts, and fix "total_extent_count" to include
both accepted and pending extents counting.

Signed-off-by: Fan Ni <fan.ni@samsung.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Message-Id: <20250714174509.1984430-2-Jonathan.Cameron@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Fan Ni 2025-07-14 18:44:57 +01:00 • committed by Michael S. Tsirkin
parent 98f030e7c9
commit fe63feb7e8
3 changed files with 21 additions and 9 deletions
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3
include/hw/cxl/cxl_device.h
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@ -618,6 +618,7 @@ struct CXLType3Dev {
CXLDCExtentList extents;
CXLDCExtentGroupList extents_pending;
uint32_t total_extent_count;
uint32_t nr_extents_accepted;
uint32_t ext_list_gen_seq;
uint8_t num_regions; /* 0-8 regions */
@ -696,7 +697,7 @@ CXLDCExtentGroup *cxl_insert_extent_to_extent_group(CXLDCExtentGroup *group,
uint16_t shared_seq);
void cxl_extent_group_list_insert_tail(CXLDCExtentGroupList *list,
CXLDCExtentGroup *group);
void cxl_extent_group_list_delete_front(CXLDCExtentGroupList *list);
uint32_t cxl_extent_group_list_delete_front(CXLDCExtentGroupList *list);
void ct3_set_region_block_backed(CXLType3Dev *ct3d, uint64_t dpa,
uint64_t len);
void ct3_clear_region_block_backed(CXLType3Dev *ct3d, uint64_t dpa,